CIRCUIT
PROTECTION
SOLUTIONS FOR
AUTOMOTIVE
APPLICATIONS
Passenger Car Solutions
Our offering of automotive circuit protection solutions encompasses a wide range of applications:
Powertrain
Safety
Comfort
Infotainment
Fuse Box
Power Supply
Lighting
Engine Management
Transmission Control
Cooling Fan
Water Pump
ABS
EPAS
Air Bag
Chassis Control
Window Lift
Sun Roof
Door Lock
Power Seat
HVAC
Dashboard
Navigation
In-Car Entertainment
Wire Harness
Generator
HID Headlight
Headlight Leveling
Directional Lighting
portfolio of Littelfuse automotive
technologies, products & services
Passenger Automobiles Aftermarket
SERVICES
Product Technologies Plus Application Design Evaluation Services
Littelfuse is the world leader in circuit protection. We offer an
extensive selection of circuit protection technologies for Automotive
applications. Littelfuse circuit protection expert staff can assist you in
designing circuit protection for your most demanding
applications. Solutions for over-current applications as well as
over-voltage applications are available from Littelfuse.
1
3
5
7
CIRCUIT PROTECTION TECHNOLOGIES (1-8)
2
1. Fuses/Footprint Reduction
MICRO2, MICRO3 fuses
2. Medium Current Cartridge Fuses
MCASE+ cartridge fuses; considerably smaller
than JCASE® and Low Profile JCASE® fuses
3. Discrete High Current Fuses
High Current Bolt Down fuses and fuse arrays
4. ZCase Masterfuse
Smallest high current distribution product in the
industry
5. Masterfuse
High current distribution array
6. ZCase Single MEGA
Minimal Footprint Bolt Down fuse
7. High Voltage Fuses
Low-current fuses for Electric and Hybrid Electric
Vehicles
8. Battery Cable Protection
CABLE PRO® protectors for mounting directly
inline as part of a high power cable assembly
4
6
8
littelfuse.com
Blade Fuses 1
Cartridge Fuses 10
High Current Fuses 16
Cable & PAL Fuses 38
High Voltage Fuses 42
Specialty Products 47
Fuseology 51
Table of Contents
Littelfuse and the Environment
As members of the global community, we at Littelfuse
have always strived to understand the impact of what
we do, and of what we create, on the world around us.
Because of this, our concern for the environment has
always been an integral and fundamental part of our
business. We continually work to balance our business
objectives with the need to protect and improve the local
and global environment.
Our Strategy for the Design of
Eco-friendly Products
Littelfuse has established a focused program committed to
developing high-performance eco-friendly products along
with a comprehensive set of processing/reliability data and
technical process expertise. This includes processes for
eliminating, detecting and documenting the presence of
hazardous materials such as
• Lead
• Cadmium
• Hexavalent Chromium
• Mercury
• Brominated flame-retardants
(PBBs and PBDEs)
The Littelfuse strategy for eco-friendly products is
specifically designed to help support our worldwide
customers in their transition to Lead-Free processing.
All products considered to be lead-free are marked with
this symbol.
Littelfuse defines lead-free as products which contain less
than 1000ppm (0.1%) Lead, measured by weight of the
entire product.
All RoHS compliant products are marked with this symbol.
Littelfuse follows the requirement set by the European
Union for all RoHS compliant products. The European Union
Directive 2002/95/EC RoHS restricts the use of Lead,
Mercury, Hexavalent Chromium, Cadmium and Brominated
flame-retardants (PBBs and PBDEs)
Visit www.littelfuse.com/lead-free
for further information.
Helping to make the World a Cleaner Place to Live
littelfuse.com
1 littelfuse.com
MICRO2 Blade Fuse 32V 2
MICRO3 Blade Fuse 32V 3
Low Profile MINI® Fuses Rated 58V 4
MINI® Blade Fuse Rated 32V 5
MINI® Blade Fuse Rated 58V 6
ATOF® Blade Fuse Rated 32V 7
MAXI® Blade Fuse Rated 32V 8
MAXI® Blade Fuse Rated 58V 9
Blade Fuses
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 2
MICRO2™ Blade Fuses Rated 32V
The MICRO2™ Fuse is the new standard for vehicle circuit protection. Its sub-miniature
design meets the need for more circuits to be protected while utilizing less space and its
ability to cope with high temperatures in adverse environments makes the MICRO2™ Fuse of
recommended choice for protection.
Black amperage stamps are used on the 20A & 25A / light colored housings to improve
contrast for vision system inspection.
Blade Fuses
Specifications MICRO2 MICRO2 Sn
(Silver Plated) (Tin Plated)
Voltage Rating: 32 VDC 32 VDC
Interrupting Ratings: 1000A @ 32 VDC 1000A @ 32 VDC
*Component Level Temperature Range: -40˚C to +125˚C -40˚C to +105˚C
**System Level Temperature Range: -40˚C to +105˚C -40˚C to +85˚C
105°C and 85°C are typical system level temperature requirements.
Terminals: Ag plated zinc alloy Sn plated zinc alloy
Housing Material: PA66 PA66
Conforms to: SAE 2741 and ISO 8820-4 in reference to electrical, mechanical
and environmental performance requirements
MICRO2TM Sn
(Tin plated) Blade Fuses
MICRO2TM Blade Fuses
Dimensions
Dimensions in mm
Temperature Rerating Curve Time-Current Characteristic Curves
Ordering Information
Part Number Package Size
0327xxx.YX2S 4000
0327xxx.UXS 500
0327xxx.LXS 50
MICRO2 Sn Fuse
0327xxx.YX2T 4000
Time-Current Characteristics
% of Rating Opening Time Min / Max
110 100 h / –
135 0.75 sec / 120 sec
160 0.30 sec / 50 sec
200 0.15 sec / 5 sec
350 0.04 sec / 0.50 sec
600 0.02 sec / 0.100 sec
Ratings
Part Number Current Rating
(A)
Housing
Material Color
Typ. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A2s)
0327005._ 5 116 17.4 17
032707.5_ 7.5 106 10.8 47
0327010._ 10 102 7.7 89
0327015._ 15 94 4.9 189
0327020._ 20 91 3.5 397
0327025._ 25 90 2.6 585
0327030._ 30 88 2.1 1028
0.01
0.10
1.00
10.00
100.00
1 10 100 1000
Time (s)
Current (A)
MICRO2 Fuse Preliminary Time-Current Characteristics
July 2008
5
7.5
10
15
20
25
30
*Component Level Temperature =
the maximum ambient temperature
that a single fuse will survive. This
does not factor-in the heat from a
populated fuse box, but does include
the heat from the current load with
the proper rerating. **System Level
Temperature represents the ambient
temperature of the fuse box at a
location within the vehicle. The
temperature within a populated fuse
box (in a given location) will be
higher. The limiting factor is the
plating. Sn-plating’s temperature
limit is 130°C, and Ag-plating
allows up to 150°C at the terminal
interface.
littelfuse.com
3
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
MICRO3™ Blade Fuses Rated 32V
The MICRO3™ Fuse has 3 terminals and 2 fuse elements with a common center terminal.
Its sub-miniature design meets the need for more circuits to be protected while utilizing less
space and its ability to cope with high temperatures in adverse environments makes the
MICRO3™ Fuse of recommended choice for protection.
Specifications
Voltage Rating: 32 VDC
Interrupting Ratings: 1000A @ 32 VDC
*Component Level Temperature Range: -40˚C to +125˚C
**System Level Temperature Range: -40˚C to +105˚C
105°C is a typical system level temperature requirement.
Terminals: Ag plated zinc alloy
Housing Material: PA66
Conforms to: SAE 2741 and ISO 8820-4 in reference to electrical, mechanical
and environmental performance requirements
Time-Current Characteristics
% of Rating Opening Time (Min / Max)
110 100 h / –
135 0.75 sec / 120 sec
160 0.30 sec / 50 sec
200 0.15 sec / 5 sec
350 0.04 sec / 0.50 sec
600 0.02 sec / 0.100 sec
Ratings
Part Number Current Rating
(A)
Housing
Material Color
Typ. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A2s)
0337005._ 5 116 17.4 17
033707.5_ 7.5 106 10.8 47
0337010._ 10 102 7.8 89
0337015._ 15 94 4.9 189
Ordering Information
Part Number Package Size
0337xxx.PX2S 2000
0337xxx.LXS 50
Time-Current Characteristic Curves
Blade Fuses
Dimensions
Dimensions in mm
Temperature Rerating Curve
*Component Level Temperature = the maximum ambient temperature that a
single fuse will survive. This does not factor-in the heat from a populated fuse
box, but does include the heat from the current load with the proper rerating.
**System Level Temperature represents the ambient temperature of the fuse
box at a location within the vehicle. The temperature within a populated fuse
box (in a given location) will be higher. The limiting factor is the plating.
Sn-plating’s temperature limit is 130°C, and Ag-plating allows up to 150°C at
the terminal interface.
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 4
Low Profile MINI® Blade Fuses Rated 58V
The Low Profile MINI® fuse has similar performance characteristics as the standard MINI®
fuse. The lower overall height allows for more space and weight savings. The Low Profile
MINI® fuse is designed to mate with tuning-fork terminals, which provides additional weight
and material savings in fuse box designs by eliminating the need for female box terminals.
Specifications
Voltage Rating: 58 VDC
Interrupting Rating: 1000A @ 58 VDC
*Component Level Temperature Range: -40˚C to +125˚C
**System Level Temperature Range: -40˚C to +105˚C
105°C is a typical system level temperature requirement.
Terminals: Ag plated zinc
Housing Material: PA66
Complies with: ISO 8820-9
Low Profile MINI® 10.9mm
Blade Fuses
Low Profile MINI®
Blade Fuses
Time-Current Characteristics
% of Rating Opening Time Min / Max (s)
110 360,000 s / –
135 0.750 s / 120 s
200 0.150 s / 5 s
350 0.080 s / 0.250 s
600 0.030 s / 0.100 s
Ordering Information
Part Number Package Size Plating
0891xxx.NXS 5000 Ag
0891xxx.U 500 Ag
0891xxx.H 100 Ag
Low Profile MINI® 10.9mm Fuse
0891xxx.NXWS 5000 Ag
Dimensions
Dimensions in mm
Time-Current Characteristic
Curves
Ratings
Part Number Current Rating
(A)
Housing
Material Color
Cold Resistance
(mΩ)
I2t
(A2s)
0891002._2 54.2 3
0891005._ 5 17.21 22
089107.5_ 7.5 10.65 53
0891010._ 10 7.59 102
0891015._ 15 4.70 198
0891020._ 20 3.35 420
0891025._ 25 2.56 613
0891030._ 30 2.06 1110
Low Profile MINI® 10.9mm
Blade Fuses
Temperature Rerating Curve
Low Prole MINI®
10.9mm
*Component Level Temperature = the maximum ambient temperature that a single fuse will
survive. This does not factor-in the heat from a populated fuse box, but does include the
heat from the current load with the proper rerating. **System Level Temperature represents
the ambient temperature of the fuse box at a location within the vehicle. The temperature
within a populated fuse box (in a given location) will be higher. The limiting factor is the
plating. Sn-plating’s temperature limit is 130°C, and Ag-plating allows up to 150°C at the
terminal interface.
† Only offered for the 10.0mm series.
littelfuse.com
5
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
MINI® Blade Fuses Rated 32V
The MINI® Fuse is the standard for vehicle circuit protection. Its miniature design meets the
need for more circuits to be protected while utilizing less space, and its ability to cope with
high temperatures in adverse environments makes the MINI® Fuse of recommended choice
for protection.
Specification MINI MINI Sn
(Silver Plated) (Tin Plated)
Interrupting Rating: 1000A @ 32 VDC 1000A @ 32 VDC
Voltage Rating: 32 VDC 32 VDC
*Component Level Temperature Range: -40˚C to +125˚C -4C to +105˚C
**System Level Temperature Range: -40˚C to +105˚C -40˚C to +8C
105°C and 85°C are typical system level temperature requirements.
Terminals: Ag plated zinc alloy Sn plated zinc alloy
Housing Material: PA66 PA66
Complies with: SAE J2077, ISO 8820-3, SAE J2077, ISO 8820-3
UL 248 Special Purpose Fuses not UL recognized
MINI® Sn (Tin plated)
Blade Fuses
MINI® Blade Fuses
Time-Current Characteristics
% of Rating Opening Time Min / Max (s)
110 360,000 s / –
135 0.75 s / 600 s
200 0.15 s / 5 s
350 0.080 s / 0.500 s
600 0.030 s / 0.100 s
Ordering Information
Part Number Package Size
0297xxx.WXNV 3000
0297xxx.U 500
0297xxx.H 100
0297xxx.L 50
MINI® Sn Fuse
0297xxx.WXT 3000
Ratings
Part Number Current Rating
(A)
Housing
Material Color
Typ. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A²s)
0297002._ 2 171 55.60 2.8
0297003._ 3 153 33.75 9.4
0297004._ 4 121 23.48 17
0297005._ 5 129 17.75 25
029707.5_ 7.5 135 10.85 68
0297010._ 10 108 7.42 93
0297015._ 15 98 4.58 270
0297020._ 20 96 3.21 380
0297025._ 25 86 2.36 625
0297030._ 30 87 1.85 1130
0.825
Dimensions
Dimensions in mm
Temperature Rerating Curve
Time-Current
Characteristic Curves
Blade Fuses
*Component Level Temperature = the maximum ambient temperature that a
single fuse will survive. This does not factor-in the heat from a populated
fuse box, but does include the heat from the current load with the proper
rerating. **System Level Temperature represents the ambient temperature of
the fuse box at a location within the vehicle. The temperature within a
populated fuse box (in a given location) will be higher. The limiting factor is
the plating. Sn-plating’s temperature limit is 130°C, and Ag-plating allows up
to 150°C at the terminal interface.
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 6
MINI® Blade Fuses Rated 58V
MINI® style fuse for use in 42V Systems. Same Time-Current characteristic as the 32V MINI®
fuse. Fits into standard MINI® fuse sockets. Has a rejection feature to prevent fuses with
lower voltage rating from being wrongfully inserted into the circuit. Current rating 2A - 30A
@58 VDC max.
Specifications
Interrupting Rating: 1000A @ 58 VDC
Voltage Rating: 58 VDC
*Component Level Temperature Range: -40˚C to +125˚C
**System Level Temperature Range: -40˚C to +105˚C
105°C is a typical system level temperature requirement.
Terminals: Ag plated zinc alloy
Housing Materials: PA66
Complies with: SAE J2077, SAE 2576
ISO 8820
UL 248 Special Purpose Fuses
MINI® Blade Fuses
Time-Current Characteristics
% of Rating Opening Time Min / Max (s)
110 360,000 s / –
135 0.75 s / 600 s
200 0.15 s / 5 s
350 0.080 s / 0.500 s
600 0.030 s / 0.100 s
Ratings
Part Number Current Rating
(A)
Housing
Material Color
Typ. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A²s)
0997002_ 2 171 55.60 2.8
0997003_ 3 153 33.75 9.4
0997004_ 4 121 23.48 17
0997005_ 5 129 17.75 25
099707.5_ 7.5 135 10.85 68
0997010_ 10 108 7.42 93
0997015_ 15 98 4.58 270
0997020_ 20 96 3.21 380
0997025_ 25 86 2.36 625
0997030_ 30 87 1.85 1130
0.825
Dimensions
Dimensions in mm
Temperature Rerating Curve
Time-Current
Characteristic Curves
Blade Fuses
Ordering Information
Part Number Package Size
0997xxx.WXN 3000
*Component Level Temperature = the maximum ambient
temperature that a single fuse will survive. This does not factor-in
the heat from a populated fuse box, but does include the heat from
the current load with the proper rerating. **System Level
Temperature represents the ambient temperature of the fuse box
at a location within the vehicle. The temperature within a populated
fuse box (in a given location) will be higher. The limiting factor is
the plating. Sn-plating’s temperature limit is 130°C, and Ag-plating
allows up to 150°C at the terminal interface.
littelfuse.com
7
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
Ratings
Part Number Current Rating
(A)
Housing
Material Color
Typ. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A²s)
0997002_ 2 171 55.60 2.8
0997003_ 3 153 33.75 9.4
0997004_ 4 121 23.48 17
0997005_ 5 129 17.75 25
099707.5_ 7.5 135 10.85 68
0997010_ 10 108 7.42 93
0997015_ 15 98 4.58 270
0997020_ 20 96 3.21 380
0997025_ 25 86 2.36 625
0997030_ 30 87 1.85 1130
ATOF® Blade Fuses Rated 32V
Developed by Littelfuse for the automotive industry, the ATOF® fuse has become the original
equipment circuit protection standard for foreign and domestic automobiles and trucks.
Readily identifiable and easily replaced, this fuse can be specified for a variety of low voltage
electronic applications.
Blade Fuses
ATO® Ag (Silver plated)
Blade Fuses
ATOF® Blade Fuses
Ordering Information
Part Number Package Size
0287xxx.PXCN 2000
0287xxx.U 500
0287xxx.H 100
0287xxx.L 50
ATO® Ag Fuse
0287xxx.PXS 2000
Dimensions
Dimensions in mm
Temperature Rerating Curve
Time-Current
Characteristic Curves
Specification ATOF® ATO Ag
(Tin Plated) (Silver Plated)
Voltage Rating: 32 VDC 32 VDC
Interrupting Rating: 1000A @ 32 VDC 1000A @ 32 VDC
*Component Level Temperature Range: -40˚C to +105˚C -4C to +125˚C
**System Level Temperature Range: -40˚C to +85˚C -40˚C to +105˚C
105°C and 85°C are typical system level temperature requirements.
Terminals: Sn plated zinc alloy Ag plated zinc alloy
Housing Material: PA66 PA66
Complies with: SAE J1284,ISO 8820-3 SAE J1284,ISO 8820-3
UL Listed: File AU1410 File AU1410
CSA Certified: File No. 29862 File No. 29862
Ratings
Part Number Current Rating
(A)
Housing
Material Color
Typ. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A2s)
0287001._ 1 176 123 0.4
0287002._ 2 141 53.5 1.4
0287003._ 3 137 31.1 7.4
0287004._ 4 136 22.8 14
0287005._ 5 128 17.85 26
028707.5_ 7.5 116 10.91 60
0287010._ 10 109 7.70 115
0287015._ 15 102 4.80 340
0287020._ 20 98 3.38 520
0287025._ 25 92 2.52 1080
0287030._ 30 84 1.97 1510
0287035._ 35 87 1.61 2280
0287040._ 40 96 1.44 3310
Time-Current Characteristics
% of Rating Current
Rating
Opening Time
Min / Max (s)
100 35A & 40A 360,000 s / –
110 1A-30A 360,000 s / –
135 1A & 2A
3A-40A
350 ms / 600 s
0.750 s / 600 s
160 1A-40A 250 ms / 50 s
200 1A & 2A
3A-40A
100 ms / 5.0 s
0.150 s / 5.0 s
350 1A & 2A
3A-40A
20 ms / 500 ms
80 ms / 500 ms
600 1A-30A
35A & 40A
– / 100 ms
– / 150 ms
*Component Level Temperature = the maximum ambient temperature that a
single fuse will survive. This does not factor-in the heat from a populated
fuse box, but does include the heat from the current load with the proper
rerating. **System Level Temperature represents the ambient temperature of
the fuse box at a location within the vehicle. The temperature within a
populated fuse box (in a given location) will be higher. The limiting factor is
the plating. Sn-plating’s temperature limit is 130°C, and Ag-plating allows up
to 150°C at the terminal interface.
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 8
Specification MAXI MAXI Sn
(Silver Plated) (Tin Plated)
Voltage Rating: 32 VDC 32 VDC
Interrupting Ratings: 1000A @ 32 VDC 1000A @ 32 VDC
*Component Level Temperature Range: -40˚C to +125˚C -40˚C to +105˚C
**System Level Temperature Range: -40˚C to +105˚C -40˚C to +85˚C
105°C and 85°C are typical system level temperature requirements.
Terminals: Ag plated zinc alloy Sn plated zinc alloy
Housing Material: PA66 PA66
Complies with: SAE J 1888, SAE 2576, SAE J 1888, SAE 2576,
ISO 8820-3:2002(E) ISO 8820-3:2002(E)
Time-Current Characteristics
% of Rating Opening Time Min / Max (s)
100 360,000 s / –
135 60 s / 1,800 s
200 2 s / 60 s
350 0.20 s / 7 s
600 0.040 s / 1 s
Ordering Information
Part Number Package Size
0299xxx.ZXNV 1200
0299xxx.L 50
0299xxx.TXN 10
MAXI Sn Fuse
0299xxx.ZXT 1200
Ratings
Part Number Current Rating
(A)
Housing
Material Color
Typ. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A2s)
0299020._ 20 76 3.10 1100
0299025._ 25 75 2.39 2087
0299030._ 30 77 1.95 4070
0299035._ 35 75 1.71 6032
0299040._ 40 75 1.42 8450
0299050._ 50 73 1.10 11300
0299060._ 60 77 0.89 15300
0299070._ 70 61 0.64 21200
0299080._ 80 62 0.54 43600
MAXI Sn Fuse (tin plated)
Blade Fuses
MAXI Blade Fuses Rated 32V
The MAXI® fuse uses “Diffusion Pill Technology” to provide predictable time delay
characteristics and low heat dissipation.
MAXI Blade Fuses
Dimensions
Dimensions in mm
Temperature Rerating Curve
Time-Current
Characteristic Curves
*Component Level Temperature = the maximum ambient
temperature that a single fuse will survive. This does not factor-in
the heat from a populated fuse box, but does include the heat from
the current load with the proper rerating. **System Level
Temperature represents the ambient temperature of the fuse box
at a location within the vehicle. The temperature within a populated
fuse box (in a given location) will be higher. The limiting factor is
the plating. Sn-plating’s temperature limit is 130°C, and Ag-plating
allows up to 150°C at the terminal interface.
littelfuse.com
9
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
Time-Current Characteristics
% of Rating Opening Time Min / Max (s)
100 360,000 s / –
135 60 s / 1,800 s
200 2 s / 60 s
350 0.20 s / 7 s
600 0.040 s / 1 s
Blade Fuses
Specifications
Voltage Rating: 58 VDC
Interrupting Ratings: 1000A @ 58 VDC
*Component Level Temperature Range: -40˚C to +125˚C
**System Level Temperature Range: -40˚C to +105˚C
105°C is a typical system level temperature requirement.
Terminals: Ag plated zinc alloy
Housing Material: PA66
Complies with: SAE J 1888, SAE 2576
ISO 8820-3:2002(E)
Time-Current Characteristics
% of Rating Opening Time Min / Max (s)
100 360,000 s / –
135 60 s / 1,800 s
200 2 s / 60 s
350 0.20 s / 7 s
600 0.040 s / 1 s
Ordering Information
Part Number Package Size
0999xxx.ZXN 1200
Ratings
Part Number Current Rating
(A)
Housing
Material Color
Typ. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A2s)
0999020._ 20 76 3.10 1100
0999025._ 25 75 2.39 2087
0999030._ 30 77 1.95 4070
0999035._ 35 75 1.71 6032
0999040._ 40 75 1.42 8450
0999050._ 50 73 1.10 11300
0999060._ 60 77 0.89 15300
0999070._ 70 61 0.64 21200
0999080._ 80 62 0.54 43600
MAXI Blade Fuses Rated 58V
The MAXI® style fuse for use in 42V Systems. Same Time-Current characteristic as the 32V
MAXI fuse using “Diffusion Pill Technology” to provide predictable time delay characteristics
and low heat dissipation. Fits into standard MAXI® fuse sockets. Has a rejection feature to
prevent fuses with lower voltage rating from being wrongfully inserted into the circuit. Current
rating 20A - 80A @58 VDC max.
MAXI Blade Fuses
Dimensions
Dimensions in mm
Temperature Rerating Curve
Time-Current
Characteristic Curves
*Component Level Temperature = the maximum ambient
temperature that a single fuse will survive. This does not
factor-in the heat from a populated fuse box, but does include
the heat from the current load with the proper rerating.
**System Level Temperature represents the ambient
temperature of the fuse box at a location within the vehicle.
The temperature within a populated fuse box (in a given
location) will be higher. The limiting factor is the plating.
Sn-plating’s temperature limit is 130°C, and Ag-plating allows
up to 150°C at the terminal interface.
littelfuse.com 10
MCASE+ Cartridge Fuses Rated 32V 11
MCASE Cartridge Fuses Rated 32V 13
Low Profile JCASE® Fuse Rated 58V 14
JCASE® Fuse Rated 32V 15
Cartridge Fuses
littelfuse.com
11
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
85 %
90 %
95 %
100 %
105 %
110 %
-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100110120130
Rerating
Factor
Temperature [oC]
Cartridge Fuses
MCASE+™ Cartridge Fuses Rated 32V
The Unslotted MCASE+™ Fuse is a cartridge style fuse up to 40A with female terminals
for 2.8 mm male terminals. The Slotted MCASE+™ Fuse is available in amperages up to
60A and can mate with larger male terminals (e.g., 6.3mm) or even mount directly to onto a
busbar. It has a miniaturized footprint for optimal usage of space. It is a time delayed fuse and
can handle inrush currents.
Specifications
Voltage Rating: 32 VDC
Interrupting Ratings: 1000A @ 32 VDC
Operating Temperature Range: -40˚C to +125˚C
Housing Material: PPA-GF33
Cover Material: PA66
Fuse Insertion Force: 50N (11.2lbf) Typical
Extraction Force: 4N Min. (0.9 lb). | 24.5N Max. (5.5 lb)
Conforms to: SAE 2741 and ISO 8820-4 in reference to electrical, mechanical
and environmental performance requirements
Temperature Rerating Curve
Time-Current Characteristic Curves
MCASE+™ Cartridge Fuses
Ratings
Part Number Type Current Rating*
(A)
Housing
Material Color
Max. Voltage
Drop (mV)
Cold Resistance
(mΩ)
I2t
(A2s)
0695015.PXP Unslotted 15 125 5.1 310
0695020.PXP Unslotted 20 125 3.4 750
0695025.PXP Unslotted 25 125 2.5 1300
0695030.PXP Unslotted 30 120 1.8 970
0695040.PXP Unslotted 40 120 1 1550
0695015.PXPS Slotted 15 125 5.1 310
0695020.PXPS Slotted 20 125 3.4 750
0695025.PXPS Slotted 25 125 2.5 1300
0695030.PXPS Slotted 30 120 1.8 970
0695040.PXPS Slotted 40 120 1.1 1550
0695050.PXPS Slotted 50 120 0.8 4000
0695060.PXPS Slotted 60 120 0.6 8500
Time-Current Characteristics
% of Rating Opening Time Min / Max
110 100hrs / –
135 60s / 1800s
200 2s / 60s
350 0.2s / 7s
600 0.04s / 1s
Ordering Information
Part Number Package Size
0695xxx.PXPS Slotted 2000
0695xxx.PXP Unslotted 2000
* The performance of the male terminal is critical to ensuring the fuse will function as
designed. The current-carrying capability of the mating terminal must be verified to
ensure proper system operation.
10
100
1000
NDS
50A
60A
40A
30A
15A
20A
25A
0.01
0.1
1
10 100 1000 10000
TIMEINSECO
CURRENT IN AMPERES
CURRENT
IN
AMPERES
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 12
Dimensions
Dimensions in mm
Cartridge Fuses
MCASE+™ Cartridge Fuses Rated 32V
Slotted
Unslotted
MCASE+™
Fuse
LP JCASE®
Fuse
JCASE®
Fuse
littelfuse.com
13
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
MCASE™ Cartridge Fuses Rated 32V
The MCASE™ is a cartridge style fuse with female terminals for 2.8 mm male terminals. It has
a miniaturized footprint for optimal usage of space. It is a time delayed fuse and can handle in
rush currents.
Specifications
Voltage Rating: 32 VDC
Interrupting Ratings: 1000A @ 32 VDC
Operating Temperature Range: -40˚C to +125˚C
Housing Material: PPA-GF33
Cover Material: PA66
Insertion Force: 50N (11.2lbf) Typical
Extraction Force: 4N Min. (0.9 lb). | 24.5N Max. (5.5 lb)
Conforms to: SAE 2741 and ISO 8820-4 in reference to electrical, mechanical
and environmental performance requirements
MCASE™ Cartridge
Fuses
Time-Current Characteristics
% of Rating Opening Time Min / Max (s)
110 100 hrs / –
135 60 s / 1800 s
200 2 s / 60 s
350 0.2 s / 7 s
600 0.04 s / 1 s
Ordering Information
Part Number Package Size
0695xxx.PX4 2000
0695xxx.U 500
0695xxx.L 50
Dimensions
Dimensions in mm
Temperature Rerating Curve
Time-Current
Characteristic Curves
Ratings
Part Number Current Rating
(A)
Housing
Material Color
Max. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A2s)
0695015._ 15 125 4.9 160
0695020._ 20 125 3.5 530
0695025._ 25 125 2.3 1140
0695030._ 30 120 1.8 970
0695040._ 40 120 1.3 2950
0.0
0.1
1.0
10.0
100.0
1 10 100 1000
Time (s)
Current (A)
15
20
25
30
40
0.0
0.1
1.0
10.0
100.0
1 10 100 1000
Time (s)
Current (A)
15
20
25
30
40
85 %
90 %
95 %
100 %
105 %
110 %
-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100110120130
Rerating
Factor
Temperature [oC]
MCASE™
LP JCASE
JCASE
Cartridge Fuses
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 14
Time-Current Characteristics
% of Rating Opening Time Min / Max (s)
100 360,000 s / –
135 60 s / 1800 s
200 4 s / 60 s
350 0.200 s / 7 s
600 0.040 s / 1 s
Ordering Information
Part Number Package Size
0895xxx.Z 2000
0895xxx.U 500
0895xxx.T 10
Corresponding holder see Section “Fuse Holders.”
Ratings
Part Number Current Rating
(A)
Housing
Material Color
Max. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A²s)
0895020_ 20 125 4.48 400
0895025_ 25 125 3.39 680
0895030_ 30 125 2.68 1780
0895040_ 40 125 1.89 5470
0895050_ 50 125 1.08 4880
0895060_ 60 125 0.83 9600
Littelfuse, Inc. Confidential October 2013
0.01
0.1
1
10
100
1000
10 100 1000 10000
TIME IN SECONDS
CURRENT IN AMPERES
LOW PROFILE (LP) JCASE FUSE TIME-CURRENT CHARACTERISTIC CURVES
20A
25A
30A
40A
50A
60A
Cartridge Fuses
Low Profile JCASE® Cartridge Fuses Rated 58V
The Low Profile JCASE® fuse has similar performance characteristics as the standard JCASE®
fuse. The lower overall height reduction allows for more space and weight savings and also
allows for a shorter male blade terminal, saving additional weight and material savings in fuse
box designs.
Specifications
Voltage Rating: 58 VDC
Interrupting Rating: 1000A @ 58 VDC
Operating Temperature Range: -4C to + 125˚C
Housing Material: PPA-GF13
Cover Material: PA66
Insertion Force: 53N Max. (12 lb.)
Extraction Force: 9N Min (2 lb.)
Conforms to: SAE 2741 and ISO 8820-4 except for the life test – LF
specification is 100-hours at 100% of rated current
Dimensions
Dimensions in mm
Temperature Rerating Curve
Time-Current
Characteristic Curves
Low Profile JCASE®
Cartridge Fuses
littelfuse.com
15
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
Cartridge Fuses
Specifications
Voltage Rating: 32 VDC
Interrupting Rating: 1000A @ 32 VDC
Operating Temperature Range: -4C to + 125˚C
Housing Material: PA-GF13HS
Housing Material (60A): PA-GF13
Cover Material: PC
Insertion Force: 53N max. (12 lb.)
Extraction Force: 9N min. (2 lb.)
Complies with: SAE 2741, ISO 8820-4
Time-Current Characteristics
% of Rating Opening Time Min / Max (s)
110 360,000 s / –
135 60 s / 1800 s
200 4 s / 60 s
350 0.200 s / 7 s
600 0.040 s / 1 s
Ordering Information
Part Number Package Size
0495xxx.ZXA 2200
0495xxx.UXA 500
0495xxx.TXA 10
Ratings
Part Number Current Rating
(A)
Housing
Material Color
Typ. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A²s)
0495020_ 20 106 4.29 1750
0495025_ 25 101 3.28 3220
0495030_ 30 91 2.12 1480
0495040_ 40 87 1.30 3650
0495050_ 50 88 0.99 8750
0495060_ 60 87 0.76 19500
JCASE® Cartridge Fuses Rated 32V
The JCASE® is a cartridge style fuse with female terminal design. JCASE® provides both
increased time delay and low voltage drop to protect high current circuits. JCASE® has the
ability to handle inrush currents.
Dimensions
Dimensions in mm
0.01
0.1
1
10
100
1000
10 100 1000 10000
20A
25A
30A
40A
50A
60A
Temperature Rerating Curve
Time-Current
Characteristic Curves
JCASE®
Cartridge Fuses
littelfuse.com 16
ZCase Masterfuse 17
Masterfuse 18
ZCase Single Starter 19
MEGA® Fuse Rated 32V 21
MEGA® Low Temperature Fuse Rated 32V 22
UL Recognized Mega® Fuse Rated 32V 24
MIDI® Style Bolt-down Fuse Rated 32V 25
BF1 Fuse Rated 32V 27
BF1 Fuse Rated 58V 29
BF2 Fuse Rated 32V 30
BF2 Fuse Rated 58V 31
CF Fuse Rated 58V 32
Fuse Strips 33
High Current Fuses
littelfuse.com
17
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
Specifications
Mating Terminal Options: M10, M8, M6, M5 bolt-down connections or female terminals
Operating Temperature Range: -4C to 125°C
Housing Material: PPA-GF33HS
Fuse Ratings Available: 30-500A
Voltage Rating: 32Vdc
Materials: Copper terminals (silver or tin plating options available)
Complies with: ISO 8820-5
High Current Fuses
ZCASE Masterfuse
The ZCASE Masterfuse product is the smallest high current distribution product in the industry.
It utilizes the Z-Axis effectively to create a compact design which takes one third the footprint
of a traditional solution. This package allows the user to replace multiple discrete fuses in a
power distribution box with a single component, thus eliminating additional bolts, bus bars and
interconnects. The output bolt is integrated into the fuse creating a reliable interface to the
mating terminal due to its high torque withstandablity. Keying features are available on each
bolt position to ensure the correct mating ring terminal is used during assembly. The solution
can also be connectorized to mate to high current terminals. This compact design enables the
integration of the high current distribution into the main junction box due to its small footprint.
This eliminates the need for a separate fuse box for high current distribution. By reducing the
number of components required, overall system costs are reduced.
The ZCASE Masterfuse product is available as a standard design with customized fuse ratings.
The modular manufacturing approach enables a wide range of configurations within a product
family. In addition, the form factor can be fully customized for specific applications to further
optimize the system. Contact Littelfuse to review your application needs.
Features and Benets:
Miniaturization: Compact design enables a 2/3 footprint reduction when compared to a
traditional solution.
Integration: Enables the integration of the prefuse function into the main junction box due to
its small footprint.
ZCASE Masterfuses
Ordering Information
Part Number Description Package Size
05980015Z-CN MFUSE ZCASE 32V 2-Way 125A - 200A 200
05980016Z-CN MFUSE ZCASE 32V 2-Way 125A - 125A 200
05980017Z-CN MFUSE ZCASE 32V 2-Way 275A - 200A 200
05980019Z MFUSE ZCASE 32V 1-MEGA + 4-MIDI 100
05980020Z MFUSE ZCASE 32V 2-MEGA + 2-MIDI 50
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 18
Specifications
Mating Terminal Options: M10, M8, M6, M5 bolt-down connections or female terminals
Operating Temperature Range: -4C to 125°C
Housing Material: PPA-GF33HS
Fuse Ratings Available: 30A-250A Full Range
300A-600A Short Circuit
Voltage Rating: 32Vdc
Materials: Copper terminals (silver or tin plating options available)
Complies with: ISO 8820-5
Note: Short circuit protected fuses have a limited continious current.
High Current Fuses
MASTERFUSE
The MASTERFUSE product is a configurable fuse solution combining several different fuse
types (i.e. MEGA and MIDI) and ratings in one compact package. This fuse package allows the
user to replace multiple discrete fuses in a power distribution box with a single component,
thus eliminating additional bolts, bus bars, and interconnects that are currently used. By
reducing the number of connections required, overall system reliability is increased while cost
is decreased.
Each MASTERFUSE is customized to the user’s application creating an optimized circuit
protection package. Contact Littelfuse to review your application needs.
Features and Benets:
Increased Reliability: due to reduced number of terminal interfaces
System Cost Savings: Material savings due to reduced number of components
required. Assembly cost savings due to reduced number of
operations required for installation.
Fuse Array Customization: Ability to mix different fuse types (i.e. MEGA, MIDI, etc.)
in one compact package
Termination Options: Ability to mate to female terminals to enable “bolt-less” design
Marking: Custom marking options available
Masterfuses
littelfuse.com
19
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
High Current Fuses
Specifications
Operating temperature: -40 to 125°C
Housing Material: PPA-GF33HS
Insulating Tube: Out of ceramic
Terminal: Tin plated Copper
Voltage Rating: 32V DC
Interrupting Rating: 2000A @ 32V VDC
Mounting Torque M6: 9.8Nm±1.4Nm
Mounting Torque M8: 14Nm±2Nm
Ordering Information
Part Number Package Size
3298XXX.ZXSTA 480
3298XXX.Z 480
3298XXX.H 100
Ratings
Part number Current Rating
(A)
Wire size
(mm2)
Max. Voltage Drop
(mV)
Average Cold Resistance
(mΩ)
I²t
(A2s)
3298040._ 40 4 110 1.53 5000
3298060._ 60 6 110 0.98 18000
3298080._ 80 10 110 0.715 15500
3298100._ 100 16 110 0.57 31000
3298125._ 125 16 110 0.39 45000
3298150._ 150 25 110 0.32 75000
3298175._ 175 25 110 0.26 140000
3298200._ 200 35 110 0.231 235000
3298225._ 225 35 110 0.175 95000
3298250._ 250 50 110 0.167 160000
3298300.ZXSTA 300 35 70 0.128 310000
3298350.ZXSTA 350 35 70 0.103 570000
3298400.ZXSTA 400 50 70 0.084 870000
3298500.ZXSTA 500 50 70 0.065 1550000
3298600.ZXSTA 600 50 70 0.049 3000000
3298900._ SHUNT 50 - - -
Time-Current Characteristics
% of Rating
Opening Time Min / Max (s)
40A - 250A 300A - 600A
50 – / – 14,400 / –
100 14,400 / – – / –
135 120 / 1800 – / –
200 1 / 15 1 / 40
350 0.300 / 5 0.300 / 5
500 – / – 0.100 / 1 (only for 500A)
600 0.100 / 1 0.100 / 1 (except 600A)
ZCASE Single MEGA/Starter Fuse
The Single ZCASE is a Minimal Footprint Bolt Down Fuse with a wide rating range up to
600A in the same packaging size. The Time Current characteristic is similar to the well known
MEGA Design and can used as full wire protection until 250A. Higher ratings mostly used for
typically Starter Fuse application as a protector fuse. The fuse design is optimized for a one
bolt connection M6 (40A - 250A) or M8 (300A - 600A) and can used directly on a battery post
or busbar connection. Littelfuse is offering a complete solution for the necessary stud and
different busbar connections including some battery clamps.
ZCASE Single Mega/Starter
Fuse
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 20
Time-Current Characteristic Curves
All ZCASE Starters T/C curves were
performed on the left or right side of
the metal bar as shown in pictures
above. A 50mm² Cu wire was mounted
at the mid hole (M8) of the metal bar
as current feed.
Examples of Single ZCASE Applications
Please contact your Littelfuse representative
for application support and information on
mating hardware.
High Current Fuses
ZCASE Single Mega/Starter Fuse
Dimensions
Dimensions in mm
1
2
3
No. Description
1 Single ZCASE Mega
2 Busbar PN: 3298002ZXBB
3 Insulting Bolt M8 PN: 3298001ZXM8
Reference Time-Current Characteristic Curves (Recorded@23˚) Reference Time-Current Characteristic Curves (Recorded@23˚)
littelfuse.com
21
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
0.1
1
10
100
1000
100 1000 10000
TIME IN SECONDS
CU RRENT IN AMPERES
125
150
175
200
225
250
275
High Current Fuses
Specifications
Interrupting Rating: 2000A @ 32 VDC
Voltage Rating: 32 VDC
Operating Temperature Range: -40˚C to + 125˚C
Housing Material: PPA-GF33HS
Terminals: Copper (Silver plated copper available)
M8 bolts
Mounting Torque: 12-18 Nm M8
Last figure of article no. = packaging code
Time-Current Characteristics
% of Rating
Opening Time Min / Max (s)
125 150-275
100 4 hrs / – 4 hrs / –
135 120 s / 1800 s 120 s / 1800 s
200 1 s / 50 s 1 s / 150 s
350 0.300 s / 5 s 0.300 s / 5 s
600 0.100 s / 1 s 0.100 s / 1 s
Ratings
Part Number Current Rating
(A)
Font Color Typ. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A2s)
0298125.ZXBLT 125 67 0.330 57000 A
0298150.ZXEH-LT 150 62 0.258 59000 A
0298175.ZXEH-LT 175 65 0.232 123000 A
0298200.ZXEH-LT 200 61 0.214 140000 A
0298225.ZXEH-LT 225 57 0.177 317000 A
0298250.ZXEH-LT 250 54 0.144 637000 A
0298275.ZXEH-LT 275 53 0.122 800000 A
MEGA® Low Temperature Fuse Rated 32V
The MEGA® Fuse is designed for high current circuit protection up to 275A with “Diffusion
Pill Technology.” The MEGA® Fuse also provides time delay characteristics. Designed
and patented by Littelfuse, the MEGA® Fuse is ideal for battery and alternator protection
application and other heavy gauge cables requiring ultra-high current protection.
MEGA® Low Temperature Fuses
Temperature Rerating Curve
Time-Current Characteristic Curves
9.9 (.39")
29.2 (1.15")
Dimensions
Dimensions in mm
Ordering Information
Part Number Rating Package
Size Plating Bolt Hole
Qty
0298125.ZXBLT 125 500 Ag 2
0298xxx.ZXEH-LT 150-275 500 None 2
0298xxx.UX1M8LT 150-275 500 None 1
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 22
High Current Fuses
Specifications
Interrupting Rating: 2000A @ 32 VDC
Voltage Rating: 32 VDC
Operating Temperature Range: -40˚C to + 125˚C
Housing Material: PPA-GF33HS
Clear Top Housing Material: PES (top) PPA-GF33HS (bottom)
Terminals: Copper (Silver plated copper available)
M6 or M8 bolts available
Mounting Torque: 8-14 Nm M6
12-18 Nm M8
Complies with: ISO 8820-5
Ordering Information
Part Number Rating Package
Size Plating Bolt
Size
Bolt Hole
Qty
0298xxx.ZXEH 80 - 250 500 None M8 2
0298xxx.ZXH 300 - 500 500 None M8 2
0298xxx.UX1M8 80 - 500 500 None M8 1
0298xxx.ZXB 40 - 250 500 Ag M8 2
0298xxx.ZXA 80 - 500 500 None M6 2
MEGA Clear Top Housing Material Fuse
0298xxx.UXT 40 - 250 500 None M8 2
Time-Current Characteristics
% of
Rating
Opening Time Min / Max (s)
40-250 300-500
75 – / – 14,400 s / –
100 14,400 s / – – / –
135 120 s / 1800 s – / –
200 1 s / 15 s 1 s / 15 s
350 0.300 s / 5 s 0.500 s / 5 s
600 0.100 s / 1 s 0.100 s / 1 s
MEGA® Clear Top Housing Fuse
MEGA® and MEGA® Clear Top Fuse Rated 32V
The MEGA® Fuse is designed for high current circuit protection up to 500A with “Diffusion
Pill Technology.” The MEGA® Fuse also provides time delay characteristics. Designed
and patented by Littelfuse, the MEGA® Fuse is ideal for battery and alternator protection
application and other heavy gauge cables requiring ultra-high current protection.
MEGA® Fuses
Note 1: Not mentioned in ISO standards Note 2: Short Circuit Protector only
* 0298xxx.ZXB has white font color on all ratings.
** Voltage Drop measurements for short circuit protectors taken at 75% of rated current.
Ratings
Part Number Current Rating
(A)
Font Color* Typ. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A2s)
0298040._140 132 2.510 8700
0298060._160 119 1.504 21000
0298080._ 80 87 0.720 21500
0298100._ 100 87 0.562 31100
0298125._ 125 80 0.423 57800
0298150._ 150 92 0.352 100000
0298175._ 175 86 0.294 168000
0298200._ 200 83 0.257 204000
0298225._ 225 82 0.222 257000
0298250._ 250 82 0.201 389000
0298300._2300 74 ** 0.167 315000
0298350._2350 68 ** 0.138 500000
0298400._2400 64 ** 0.126 610000
0298450._2450 60 ** 0.112 1050000
0298500._2500 58 ** 0.092 2050000
littelfuse.com
23
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
Time-Current Characteristic Curves
1.83 (.072 ) 300-500A
300-500A
9.9 (.39")
M6: 6.60 (.26")
M8: 8.64 (.34")
29.2 (1.15")
10.72 (.422")
40-250A
40-250A
Temperature Rerating Curve
High Current Fuses
MEGA® Fuse Rated 32V
Dimensions
Dimensions in mm
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 24
High Current Fuses
Specifications
Interrupting Rating: 2000A @ 32 VDC
Voltage Rating: 32 VDC
Operating Temperature Range: -40˚C to + 125˚C
Housing Material: PPA-GF30FR
Terminals: Copper
M8 bolts holes
Mounting Torque: 12-18 Nm M8
Complies with: ISO 8820-5 ,UL 248 Special Purpose Fuses
Ordering Information
Part Number Package Size
0298xxx.ZXEH-UL 500
Time-Current Characteristics
% of Rating
Opening Time Min / Max (s)
80A-175A
75 – / –
100 14,400 s / –
135 120 s / 1800 s
200 1 s / 15 s
350 0.300 s / 5 s
500 – / –
600 0.100 s / 1 s
Ratings
Part Number Current Rating
(A) Font Color Typ. Voltage Drop
(mV)
I2t
(A2s)
0298080.ZXEH-UL 80 87 21500
0298100.ZXEH-UL 100 87 31100
0298125.ZXEH-UL 125 80 57800
0298150.ZXEH-UL 150 92 100000
0298175.ZXEH-UL 175 62 168000
UL Recognized MEGA® Fuses Rated 32V
The MEGA® Fuse is designed for high current circuit protection with “Diffusion Pill
Technology.” The MEGA® Fuse also provides time delay characteristics. Designed and
patented by Littelfuse, the MEGA® Fuse is ideal for battery and alternator protection
application and other heavy gauge cables requiring ultra-high current protection.
Dimensions
Dimensions in mm
Temperature Rerating Curve
Time-Current
Characteristic Curves
UL Recognized MEGA® Fuses
9.9 (.39")
29.2 (1.15")
7
littelfuse.com
25
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
High Current Fuses
MIDI®, Clear MIDI®, and One Hole MIDI® Style Bolt-down Fuse
Rated 32V
This MIDI® style fuse offers a bolt-on space saving fuse for high current wiring protection
and provides time delay characteristics with “Diffusion Pill Technology”. The MIDI® was
designed and patented by Littelfuse.
MIDI® Fuses
Clear MIDI® Fuses
(transparent nylon
composite cover)
One Hole MIDI® Fuses
Specifications
Interrupting Rating: 1000A @ 32 VDC
Voltage Rating: 32 VDC
Operating Temperature Range: -4C to + 125˚C
Black Housing Material: PA-GF25FR
Clear Housing Material: PA-6/66
Terminal: Tin plated Copper
Mounting Torque M5: 4.5 Nm +/- 1Nm
Mounting Torque M6: 6.0 Nm +/- 1Nm
Complies with: ISO 8820-5, UL 248 Special Purpose Fuses
Ordering Information
Part Number Package
Size
Housing
Color
Bolt
Size
Bolt Hole
Qty Mfg Location
0498xxx.M 1000 Black M5 2Mexico
0498xxx.M-CN 1000 Black M5 2 China
0498xxx.H 100 Black M5 2Mexico
0498xxx.MXM6 1000 Black M6 2Mexico
0498xxx.MXM6-CN 1000 Black M6 2 China
0498xxx.MX1M5 1000 Black M5 1Mexico
0498xxx.MX1M5-CN 1000 Black M5 1 China
0498xxx.MX1M6 1000 Black M6 1 China
0498xxx.MX1M6-CN 1000 Black M6 1 China
0498xxx.MXT 1000 Clear M5 2Mexico
0498xxx.MXT-CN 1000 Clear M5 2 China
0498xxx.MXTM6 1000 Clear M6 2 Mexico
0498xxx.MXTM6-CN 1000 Clear M6 2 China
* Materials manufactured in Asia are produced to the same specifications as materials manufactured in North America, and
meets the same test requirements. Multiple production locations are for capacity expanison only.
Ratings
Part Number Current
Rating
(A)
Font
Color
Typ. Voltage Drop
max. (mV)
Cold Resistance
(mΩ)
I2t
(A2s)
0498023._223 90 3.43 1,800
0498030._230 65 2.06 4,200
0498040._ 40 65 1.398 10,000
0498050._ 50 65 1.025 13,000
0498060._ 60 68 0.865 21,700
0498070._ 70 70 0.72 24,000
0498080._ 80 58 0.541 24,600
0498100._ 100 60 0.457 51,300
0498125._2125 71 0.394 73,200
0498150._1,2 150 77 0.323 81,900
0498175._1,2 175 77 0.285 100,000
0498200._1,2 200 77 0.261 125,000
Time-Current Characteristics
% of Rating
Opening Time Min / Max (s)
30-125A 150-200A
75 – / – 360,000 s / –
100 360,000 s / – – / –
110 14,400 s / – – / –
150 90 s / 3,600 s – / –
200 3 s / 100 s 1 s / 15 s
300
350
0.3 s / 3 s
– / –
– / –
0.3 s / 5 s
500 0.1 s / 1 s 0.1 s / 1 s
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 26
Dimensions
Dimensions in mm
Part
Number
“A”
mm (inch)
“B”
mm (inch)
“C”
mm (inch)
0498030._ 0.41 (0.016) 4.0 (0.157) 8.0 (0.315)
0498040._ 0.41 (0.016) 4.0 (0.157) 8.0 (0.315)
0498050._ 0.41 (0.016) 4.0 (0.157) 8.0 (0.315)
0498060._ 0.41 (0.016) 4.0 (0.157) 8.0 (0.315)
0498070._ 0.41 (0.016) 4.0 (0.157) 8.0 (0.315)
0498080._ 0.41 (0.016) 4.0 (0.157) 8.0 (0.315)
0498100._ 0.63 (0.025) 4.3 (0.169) 8.3 (0.327)
0498125._ 0.63 (0.025) 4.3 (0.169) 8.3 (0.327)
0498150._ 0.63 (0.025) 4.3 (0.169) 8.3 (0.327)
0498175._ 0.63 (0.025) 4.3 (0.169) 8.3 (0.327)
0498200._ 0.63 (0.025) 4.3 (0.169) 8.3 (0.327)
MIDI®, Clear MIDI®, and One Hole MIDI® Style Bolt-down Fuse Rated 32V
MIDI Rerating Curve
85
90
95
100
105
110
115
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120
Ambient Temperature (C)
Rerating Factor (% Rated Current)
Temperature Rerating Curve
Time-Current Characteristic Curves
30A
40A
50A
60A
70A
80A
100A
125A
150A
200A
175A
1000
100
10
1
0.1
0.01
10000100010010
TIME IN SECONDS
High Current Fuses
littelfuse.com
27
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
High Current Fuses
Specifications
Operating Temperature: -40 to 125 degrees C
Housing Material: PET-GF30
Clear Housing Material: PES
Terminals: Copper alloy, gal. Sn
2 x M5 or M6 bolts, distance 30 mm
Mounting Torque M5: 4.5 Nm +/- 1Nm
Mounting Torque M6: 6.0 Nm +/- 1Nm
Interrupting Rating: 23A & 30A: 1000A @32 VDC
40A - 150A: 2000A @32 VDC
200A: 1500A @32 VDC
Complies with: ISO 8820-5, UL 248 Special Purpose Fuses
Ordering Information
Part Number Package
Size
Bolt
Size
Bolt Hole
Qty Ratings
153.5631.xxx2 1000 M5 2 30A-200A
153.5631.xxx1 10 M5 2 30A-200A
153.7010.xxx2 1000 M6 2 30A-150A
153.7000.xxx2 500 M6 2 200A
153.0010.xxx2 1000 M6 1 60A-125A
153.0020.xxx2 500 -- 0 30A-200A
Time-Current Characteristics
% of
Rating
Opening Time Min / Max (s)
23-150A Fuses 150-200A Short
Circuit Protectors
75 – / – 360,000 s / –
100 360,000 s / – – / –
110 14,400 s / – – / –
150 90 s / 3,600 s – / –
200 3 s / 100 s 1 s / 15 s
300 0.300 s / 3 s – / –
350 – / – 0.300 s / 5 s
500 0.100 s / 1 s – / –
600 – / – 0.100 s / 1 s
BF1 and One-Hole BF1 Fuse Rated 32V
This BF1 fuse is rated at 32V and offers a bolt-on fuse for high current wiring
protection. Current rating 23A - 200A; with transparent housing material for easy
detection of blown fuses. One-Hole BF1 fuses have a current rating 60-125A.
BF1 Fuses
One Hole BF1 Fuses
Ratings
Part Number Current
Rating
(A)
Housing
Material Color
Typ. Voltage
Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A2s)
M5 M6
153.5631.523_1,2 - 23 105 3.50 1,400
153.5631.530_ 153.7010.530_ 30 105 2.70 5,100
153.5631.540_ 153.7010.540_ 40 90 1.56 6,800
153.5631.550_ 153.7010.550_ 50 80 1.03 6,900
153.5631.560_ 153.7010.560_ 60 75 0.75 16,200
153.5631.570_ 153.7010.570_ 70 70 0.64 22,000
153.5631.580_ 153.7010.580_ 80 70 0.55 25,600
153.5631.610_ 153.7010.610_ 100 70 0.44 42,500
153.5631.612_ 153.7010.612_ 125 70 0.34 62,500
153.5631.615_1153.7010.615_1150 70 0.29 83,400
153.5631.620__3153.7000.620__3200 70 0.24 126,000
Corresponding holder see Section “Fuse Holders.”
Note 1: not mentioned in ISO standard Note 2: Not UL rated Note 3: Short Circuit Protector only Note 4: For
1-Hole and No-Hole values, refer to 2-Hole version values
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 28
High Current Fuses
Dimensions
Dimensions in mm
Pre-Arcing Time-Limits
23 A - 150 A: FI = 1.25 (max. operating current: 0.8 x Irat at 23°C)
200 A: FI = 2.00 (max. operating current: 0.5 x Irat at 23°C)
Derating
Individual derating curves by rating can be ordered through
your Littelfuse contact person.
BF1 and One-Hole BF1 Fuse Rated 32V
littelfuse.com
29
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
High Current Fuses
Specifications
Operating temperature: -40 to 125 degrees C
Housing Material: PET-GF30
Clear Housing Material: PES
Terminals: Copper alloy, gal. Sn
2 x M5 or M6 bolts, distance 30 mm
Mounting Torque M5: 4.5 Nm +/- 1Nm
Mounting Torque M6: 6.0 Nm +/- 1Nm
Interrupting Rating: 1000A @ 58 VDC
Complies with: ISO 8820-5, UL 248 Special Purpose Fuses
Ordering Information
Part Number Package
Size
Bolt
Size
Bolt Hole
Qty
142.5631.xxx2 500 M5 2
142.7010.xxx2 500 M6 1
142.7020.xxx2 500 N/A 0
Note 1: Not UL rated Note 2: Short Circuit Protector only
Ratings
Part Number M5 Part Number M6
Current
Rating
(A)
Housing
Material Color
Typ. Voltage
Drop
(mV)
Cold
Resistance
(mΩ)
I2t
(A2s)
142.5631.53021 142.70xx.5302130 105 2.70 5,100
142.5631.5402 142.70xx.5402 40 90 1.56 6,800
142.5631.5502 142.70xx.5502 50 80 1.03 6,900
142.5631.5602 142.70xx.5602 60 75 0.75 16,200
142.5631.5702 142.70xx.5702 70 70 0.64 22,000
142.5631.5802 142.70xx.5802 80 70 0.55 25,600
142.5631.6102 142.70xx.6002 100 70 0.44 42,500
142.5631.6122 142.70xx.6122 125 70 0.34 62,500
142.5631.6152 142.70xx.6152 150 70 0.29 83,400
142.5631.62022 142.70xx.6202 200 70 0.24 126,000
Time-Current Characteristics
% of
Rating
Opening Time Min / Max (s)
30-150A Fuses 200A Short Circuit Protectors
75 – / – 360,000 s / –
100 360,000 s / – – / –
110 14,400 s / – – / –
150 90 s / 3,600 s – / –
200 3 s / 100 s 1 s / 15 s
300 0.300 s / 3 s – / –
350 – / – 0.300 s / 5 s
500 0.100 s / 1 s – / –
600 – / – 0.100 s / 1 s
BF1 Fuses Rated 58V
This BF1 fuse is rated at 58V and offers a bolt-on fuse for high current wiring
protection. Current rating 30A - 200A; with transparent housing material for easy
detection of blown fuses.
30 A - 150 A: FI = 1.25
(max. operating current:0.8 x Irat at 23°C)
200 A: FI = 2.00
(max.operating current: 0.5 x Irat at 23°C)
Derating
Individual derating curves by rating can be ordered through your Littelfuse contact person.
Dimensions
Dimensions in mm
Pre-Arcing Time-Limits
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 30
High Current Fuses
Specifications
Housing Material: PET-GF30
Clear Housing Material: PES
Terminal: Copper alloy, gal. Sn
2 x M8 bolts, Distance 51 mm
Mounting Torque: 12.0 Nm +/- 1Nm
Breaking Capacity: 100 A - 300 A: 2.000 A, 32V, DC
400 A - 500 A: 1.500 A, 32V, DC
Complies with: ISO 8820-5, UL 248 Special Purpose Fuses
Ordering Information
Part Number Package Size
Standard M8 Holes
153.5395.xxxx 200
M6 Holes
153.7011.xxxx 200
Time Current Characteristics
% of Rating
Opening Time Min / Max (s)
100A - 250A 300A - 500A
75 – / – 4 h / –
100 4 h / – – / –
135 120 s / 1,800 s – / –
200 1 s / 15 s 1 s / 15 s
350 0.300 s / 5 s 0.500 s / 5 s
600 0.100 s / 1 s 0.100 s / 1 s
Last figure of article no. = packaging code
Corresponding holder see Section “Fuse Holders.”
* Parts with asterisk are short circuit protectors only.
Ratings
Part Number
M8 Holes
Part Number
M6 Holes
Current
Rating
(A)
Housing
Color
Typ. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A2s)
153.5395.610_ 153.7011.610_ 100 110 0.70 46,800
153.5395.612_ 153.7011.612_ 125 110 0.52 118,100
153.5395.615_ 153.7011.615_ 150 110 0.42 113,400
153.5395.617_ 153.7011.617_ 175 110 0.36 154,400
153.5395.620_ 153.7011.620_ 200 110 0.34 288,000
153.5395.622_ 153.7011.622_ 225 110 0.29 236,000
153.5395.625_ 153.7011.625_ 250 110 0.25 292,500
153.5395.630_* 153.7011.630_* 300 110 0.21 486,000
153.5395.640_* 153.7011.640_* 400 110 0.13 964,000
153.5395.650_* 153.7011.650_* 500 110 0.12 1,449,000
BF2 Fuses Rated 32V
This BF2 fuse is rated at 32V and offers a bolt-on fuse for high current wiring protection.
Current rating 100A - 500A; with transparent housing material for easy detection of
blown fuses.
BF2 Fuses
Time-Current Characteristic Curves
100A-300A: FL=1,25 (max. operating current: 0,8 x Irat at 23°C)
400A-500A: FL=2,00 (max. operating current: 0,5 x Irat at 23°C)
0,1
1
10
100
1000
10 100 1000 10000
TIME [s]
CURRENT [A]
TIME-CURRENT CHARACTERISTIC CURVES (RECORDED@23°C)
100A
125A
150A
175A
200A
225A
250A
300A
400A
500A
Dimensions
Dimensions in mm
littelfuse.com
31
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
High Current Fuses
Specifications
Housing Material: PET-GF30
Clear Housing Material: PES
Terminal: Copper alloy, gal. Sn
2 x M8 bolts, Distance 51 mm
Mounting Torque: 12.0 Nm +/- 1Nm
Breaking Capacity: 1000A, 58V DC
Complies with: ISO 8820-5, UL 248 Special Purpose Fuses
Ordering Information
Part Number Package Size
142.5395.xxxx 200
Time Current Characteristics
% of Rating
Opening Time Min / Max (s)
100A - 250A 300A
75 – / – – / –
100 4 h / – 4 h / –
135 120 s / 1,800 s – / –
200 1 s / 15 s 1 s / 15 s
350 0.300 s / 5 s 0.500 s / 5 s
600 0.100 s / 1 s 0.100 s / 1 s
Ratings
Part Number Current Rating
(A) Housing Color Typ. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A2s)
142.5395.6102 100 110 0.70 46,800
142.5395.6122 125 110 0.52 118,100
142.5395.6152 150 110 0.42 113,400
142.5395.6172 175 110 0.36 154,400
142.5395.6202 200 110 0.34 288,000
142.5395.6222 225 110 0.29 236,000
142.5395.6252 250 110 0.25 292,500
142.5395.6302¹ 300 110 0.21 486,000
BF2 Fuses Rated 58V
This BF2 fuse is rated at 58V and offers a bolt-on fuse for high current wiring protection.
Current rating 100A - 300A; with transparent housing material for easy detection of
blown fuses.
BF2 Fuses
Time-Current Characteristic Curves
Dimensions
Dimensions in mm
100A-300A: FL=1,25 (max. operating current: 0,8 x Irat at 23°C)
400A-500A: FL=2,00 (max. operating current: 0,5 x Irat at 23°C)
0,1
1
10
100
1000
10 100 1000 10000
TIME [s]
CURRENT [A]
TIME-CURRENT CHARACTERISTIC CURVES (RECORDED@23°C)
100A
125A
150A
175A
200A
225A
250A
300A
400A
500A
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 32
High Current Fuses
Dimensions
Dimensions in mm
Pre-Arcing Time-Limits
Specifications
Insulating Body Material: Ceramic
Cover Material: PES
Visible melting-element
Interrupting Rating: 2,000A @58 VDC
Complies with: ISO 8820-6, DIN 72581-5, UL 248 Special Purpose Fuses
cULus Recognized: File No. E211637
Ordering Information
Part Number Package Size
155.0892.xxx1 100
FI = 1.25 (max. operating current:
0.8 x Irat at 23°C)
Time-Current Characteristics
% of Rating Opening Time Min / Max (s)
100 360,000 s / –
135 – / 3,600 s
150 1 s / 600 s
200 0.200 s / 60 s
300 0.050 s / 1.5 s
400 0.020 s / 0.50 s
600 – / 0.20 s
Ratings
Part Number Current Rating
(A)
Typ. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A2s)
155.0892.5501 50 100 1.20 1,900
155.0892.5751 75 90 0.60 12,000
155.0892.6101 100 80 0.60 14,000
155.0892.6121 125 75 0.45 51,000
155.0892.6151 150 70 0.35 63,800
155.0892.6171 175 70 0.25 120,000
155.0892.6201 200 65 0.25 172,800
155.0892.6251 250 70 0.20 330,000
155.0892.6301 300 70 0.15 372,000
Insert CF8-Fuse links only in conjunction with the insulating nuts, see Section “Fuse Holders.”
Corresponding battery clamp see Section “Fuse Holders.”
CF Fuses Rated 58V
Main Fuse for mounting with battery clamp on the battery pole. Voltage rating 58
VDC, Current rating 50A - 300A. With transparent cover material for visual inspection of
melting element.
CF Fuses
littelfuse.com
33
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
Time-Current Characteristics
% of Rating Opening Time Min / Max (s)
100 360,000 s / –
135 – / 3,600 s
150 1 s / 600 s
200 0.200 s / 60 s
300 0.050 s / 1.5 s
400 0.020 s / 0.50 s
600 – / 0.20 s
High Current Fuses
Dimensions
Dimensions in mm
Time-Current Characteristics
% of Rating Opening Time Min / Max (s)
130 3,600 s / –
250 – / 60 s
Pre-Arcing Time-Limits
Ratings
Part Number Current Rating
(A)*
Typ. Voltage Drop
(mV)
Material Thickness “S”
(mm)
156.5611.5301 30 70 0.25
156.5611.5401 40 70 0.20
156.5611.5501 50 70 0.25
156.5611.5601 60 70 0.40
156.5611.5701 70 70 0.45
156.5611.5801 80 70 0.50
156.5611.6101 100 70 0.70
156.5611.6111 120 70 0.70
156.5611.6121 125 70 0.70
156.5611.6151 150 70 1.00
Specifications
Voltage Rating: 36 VDC
Interrupt Ratings: up to 375A
Operating Temperature Range: -40° to 125°C
Insulating Body: Out of ceramic
Metal Parts: Zinc-alloy
Complies with: DIN 72581/2
Ordering Information
Part Number Package Size
156.5611.xxx1 50
Corresponding holder see Section “Fuse Holders.”
*Metal parts in compliance with DIN 72581/2. Fuses with housings not mentioned in the standards.
S
FI = 1.00 (max. operating current : 1.0 x Irat at 23°C)
Fuse Strips with Housing Rated 36V - SPECIAL PURPOSE FUSES
(NOT INTENDED FOR AUTOMOTIVE or TRUCK APPLICATIONS)
Housed fuse strips with window for visual inspection of melting element. Current rating 30A -
150A, 36 VDC. 90° fork type lugs.
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 34
High Current Fuses
Dimensions
Dimensions in mm
Specifications
Voltage Rating: 48 VDC
Interrupt Ratings: up to 3000A
Operating Temperature Range: - -40° to 125°C
Metal Parts: 35 A - 80 A: Zinc-alloy
100A - 500 A: Copper Cu, gal. Sn
Complies with: DIN 43560-1
Ordering Information
Part Number Package Size
157.5700.xxx1 50
157.5916.xxx1 50
Corresponding holders = 177.5701.0001 and 177.5702.0001.”
Pre-Arcing Time-Limits
FI = 1.00 (max. operating
current:1.0 x Irat at 23°C)
a
a
S
Time-Current Characteristics
% of Rating
Opening Time Min / Max (s)
35-200 225 - 500
150 3,600 s / – – / –
160 – / – 60 s / –
220 – / 60 s
250 0.8 s / 10 s
400 0.20 / 2 s
Ratings
Part Number Current
Rating
(A)
Typ. Voltage
Drop
(mV)
Breaking Capacity
(VDC/A)
Material
Thickness “S”
(mm)
a = 11 mm a = 9 mm*
157.5700.5351 157.5916.5351 35 125 48/210 0.6
157.5700.5401 40 125 48/240 0.6
157.5700.5501 157.5916.5501 50 125 48/300 0.6
157.5700.5631 157.5916.5631 63 125 48/378 0.6
157.5700.5801 157.5916.5801 80 125 48/480 0.6
157.5700.6101 157.5916.6101 100 125 48/600 0.5
157.5700.6121 157.5916.6121 125 125 48/750 0.8
157.5700.6131 157.5916.6131 130 125 48/780 0.8
157.5700.6141 135 125 48/810 0.8
157.5700.6151 150 125 48/900 0.8
157.5700.6161 157.5916.6161 160 125 48/960 1.0
157.5700.6171 175 125 48/1050 1.0
157.5700.6201 157.5916.6201 200 125 48/1200 0.8
157.5700.6231 225 125 48/1350 0.5
157.5700.6251 157.5916.6251 250 125 48/1500 0.5
157.5700.6271 275 125 48/1650 0.8
157.5700.6301 300 125 48/1800 0.8
157.5700.6331 325 125 48/1950 0.8
157.5700.6351 355 125 48/2130 0.8
157.5700.6401 400 125 48/2400 0.8
157.5700.6421 425 125 48/2550 1.0
157.5700.6501 500 125 48/3000 1.0
Fuse Strips Rated 48V - SPECIAL PURPOSE FUSES
(NOT INTENDED FOR AUTOMOTIVE OR TRUCK APPLICATIONS)
Non-housed fuse strips for battery powered fuses rated at 48VDC. 90º and
straight fork type lugs.
littelfuse.com
35
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
Time-Current Characteristics
% of Rating
Opening Time Min / Max (s)
35-200 225 - 500
150 3,600 s / – – / –
160 – / – 60 s / –
220 – / 60 s
250 0.8 s / 10 s
400 0.20 / 2 s
High Current Fuses
Fuse Strips with Housing Rated 48V - SPECIAL PURPOSE FUSES
(NOT INTENDED FOR AUTOMOTIVE OR TRUCK APPLICATIONS)
Housed fuse strips for battery-powered vehicles. Current rating 35A - 500A, 48 VDC. 90°
and straight fork type lugs. With window for visual inspection of melting element.
Dimensions
Dimensions in mm
Pre-Arcing Time-Limits
FI = 1.00 (max. operating
current: 1.0 x Irat at 23°C)
Specifications
Voltage Rating: 48 VDC
Interrupt Ratings: up to 3000A
Operating Temperature Range: -40° to 125°C
Metal Parts: 35A - 80A: Zinc-alloy
100A - 500A: Copper Cu, gal. Sn
Complies with: UL 248 Special Purpose Fuses
cULus Recognized: File No. E211637
Ordering Information
Part Number Package Size
157.5701.xxx1 50
157.5917.xxx1 50
Corresponding holder see Section “Fuse Holders.”
Time-Current Characteristics
% of Rating
Opening Time Min / Max (s)
35-200 225 - 500
150 3,600 s / – – / –
160 – / – 60 s / –
220 – / 60 s
250 0.8 s / 10 s
400 0.20 / 2 s
Glass Cover
a
a
S
Ratings
Part Number Current
Rating
(A)
Typ. Voltage
Drop
(mV)
Breaking
Capacity
(VDC/A)
Material
Thickness “S”
(mm)
a = 11 mm a = 9 mm*
157.5701.5351 157.5917.5351 35 125 48/210 0.6
157.5701.5401 40 125 48/240 0.6
157.5701.5501 157.5917.5501 50 125 48/300 0.6
157.5701.5631 157.5917.5631 63 125 48/378 0.6
157.5701.5801 157.5917.5801 80 125 48/480 0.6
157.5701.6101 157.5917.6101 100 125 48/600 0.5
157.5701.6121 157.5917.6121 125 125 48/750 0.8
157.5701.6131 130 125 48/780 0.8
157.5701.6141 135 125 48/810 0.8
157.5701.6151 157.5917.6151 150 125 48/900 0.8
157.5701.6161 157.5917.6161 160 125 48/960 1.0
157.5701.6171 157.5917.6171 175 125 48/1050 1.0
157.5701.6201 157.5917.6201 200 125 48/1200 0.8
157.5701.6231 157.5917.6231 225 125 48/1350 0.5
157.5701.6251 157.5917.6251 250 125 48/1500 0.5
157.5701.6271 157.5917.6281 275 125 48/1650 0.8
157.5701.6301 300 125 48/1800 0.8
157.5701.6331 157.5917.6331 325 125 48/1950 0.8
157.5701.6351 157.5917.6351 355 125 48/2130 0.8
157.5701.6401 400 125 48/2400 0.8
157.5701.6421 157.5917.6421 425 125 48/2550 1.0
157.5701.6501 157.5917.6501 500 125 48/3000 1.0
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 36
Dimensions
Dimensions in mm
Specifications
Voltage Rating: 32 VDC
Interrupt Ratings: 1000A
Operating Temperature Range: -40° to 125°C
Material: Zinc-alloy
Connections: Zinc-alloy
2 x M6 bolts, distance 30 mm
Torque: 4 Nm +/- 1 Nm
Ordering Information
Part Number Package Size
156.5677.xxx1 100
156.5677.xxx2 10000
FI = 1.00 (max. operating current:
1.0 x Irat at 23°C)
S
Time-Current Characteristics
% of Rating Opening Time Min / Max (s)
100 / –
125 360,000 s / –
300 0.100 s / 10 s
600 0.020 s / 1 s
1000 0.010 s / 0.300 s
Ratings
Part Number Current Rating
(A)
Typ. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A²s)
Material Thickness “S”
(mm)
156.5677.530_ 30 44 1.33 3800 0.4
156.5677.540_ 40 40 0.89 11200 0.4
156.5677.550_ 50 44 0.72 21300 0.4
156.5677.560_ 60 38 0.58 41400 0.4
156.5677.580_ 80 40 0.43 44800 0.8
156.5677.611_ 110 40 0.31 139000 0.8
156.5677.615_ 150 52 0.23 465000 0.8
156.5677.617_ 175 46 0.22 560000 0.8
Pre-Arcing Time-Limits
High Current Fuses
HSB Fuses Rated 32V
Non-housed fuse strips for rated voltage up to 32 VDC. Current rating 30 A -175 A.
Ring type lugs.
littelfuse.com
37
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
High Current Fuses
Dimensions
Dimensions in mm
Ordering Information
Part Number Package Size
156.5610.xxx1 100
156.5610.xxx2 2000
*Not mentioned in the standards
Corresponding holder see Section “Fuse Holders.”
Time-Current Characteristics
% of Rating Opening Time Min / Max (s)
130 3,600 s / –
250 – / 60 s
Pre-arcing Time-limits
FI = 1.00 (max. operating current: 1.0 x Irat at 23°C)
S
Ratings
Part Number Current Rating
(A)
Typ. Voltage Drop
(mV) Material Thickness “S” (mm)
156.5610.525_ 25* 70 0.20
156.5610.530_ 30 70 0.25
156.5610.540_ 40* 70 0.20
156.5610.550_ 50 70 0.25
156.5610.560_ 60* 70 0.40
156.5610.570_ 70* 70 0.45
156.5610.580_ 80 70 0.50
156.5610.610_ 100 70 0.70
156.5610.611_ 120* 70 0.70
156.5610.612_ 125* 70 0.70
156.5610.615_ 150* 70 1.00
156.5610.625_ 250* 70 2.00
Specifications
Voltage Rating: 36 VDC
Interrupt Ratings up to 625A
Operating Temperature Range: -40° to 125°C
Material: Zinc-alloy
Complies with: DIN 72581/2
Fuse Strips with Rated 36V - SPECIAL PURPOSE FUSES
(NOT INTENDED FOR AUTOMOTIVE OR TRUCK APPLICATIONS)
Non-housed fuse strips for Diesel vehicles. Current rating 25A - 150A, 36 VDC. 90° fork
type lugs.
littelfuse.com 38
BF-Inline Fuses Rated 32V 39
CABLEPRO® Cable Protector Fuses Rated 32V 40
PAL Fuses 41
Cable/PAL Fuses
littelfuse.com
39
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
Cable Fuses
Ordering Information
Part Number Package Size
153.0000 300
Time-Current Characteristics 300A
% of Rating Opening Time Min / Max (s)
75 360,000 s
165 10 s 100 s
200 1 s 15 s
350 0.3 s 5 s
500 0.1 s 1 s
Time-Current Characteristics 100A-190A
% of Rating Opening Time Min / Max (s)
100 360,000 s
150 90 s 1800 s
200 3 s 240 s
300 0.3 s 60 s
500 0.1 s 10 s
Ratings
Part Number Current Rating
(A)
Wire Size/Type/
Marking
Typ. Voltage Drop
(mV)
Cold Resistance
(mΩ)
I2t
(A2s)
153.1002 100 10mm²/FLY/P 60 0.42 27,000
153.1012 125 10mm²/FL2G/S 70 0.32 87,500
153.1602 125 16mm²/FLY/P 75 0.41 29,600
153.1612 170 16mm²/FL2G/S 60 0.22 248,000
153.2502 170 25mm²/FLY/P 70 0.29 78,500
153.2512 190 25mm²/FL2G/S 52 0.22 248,000
153.3502 300 35mm²/FLY/P 70 0.20 373.000
0.1
1
10
100
1000
10000
100000
10 100 1000
Time (s)
Current (A)
153.1002(100A)
153.1012(125A)
153.1602(125A)
153.1612(170A)
153.2502(170A)
153.2512(190A)
153.3502(300A)
Time-Current Characteristics Curve
Specifications
Voltage Rating: 32 VDC
Housing Material: PETGF30
Insulating Housing Matierial: PAGF30
Terminals: Crimp, Copper alloy, tinned
Interrupting Rating: 2000A @32VDC
BF-Inline Fuse Rated 32V
Inline fuse to protect specific cable cross-sections and insulations; Cross-section 10mm²
to 35mm². For rated voltage up to 32 VDC.
Assembly notes: The wire integrated fuse has to be insulated by using a self-adhesive
shrinking tube. The wire has to be fixed on both sides of the fuse to minimize the wire
forces. Recommended shrinking tube: DERAY(R)-IAKT 4:1, 24mm
0.1
1
10
100
1000
10000
100000
10 100 1000
Time (s)
Current (A)
153.1002(100A)
153.1012(125A)
153.1602(125A)
153.1612(170A)
153.2502(170A)
153.2512(190A)
153.3502(300A)
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 40
Cable Fuses
Specifications
Voltage Rating: 32V
Interrupting rating: 2000A @ 32 VDC
Housing Material: PPAGF33HS
Operating Temperature Range: -4C to +125°C
Cable Types Available: SAE J1127 SXT, SAE J1128 TXL, ISO 6722: Type FL2G
Operating Temperature Range: -4C to +150°C - Optional for 150A, 175A and 200A ratings
Cable Type: Thin wall irradiated XLPE (SAE 4GA)
Available with UL recognized in 60, 100, 150 & 200 at 32V
(UL not available with the thin wall irradiated XLPE SAE 4GA cable)
CABLEPRO® Cable Protector Fuses Rated 32V
Available in AWG and metric cables
The CABLEPRO® fuse is designed to replace conventional wire fusible links in high
current automotive applications. The slim package of the CABLEPRO® and the predictable
and reliable performance characteristics (similar to MEGA® fuse) make this far superior
over wire fusible links. Interrupting rating 2000A @ 32 VDC.CablePro is not a sealed
product. To seal it a shrink tube should be used.
littelfuse.com
41
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
PAL Fuses
293 Series
Auto Link PAL 293 Series Fuse
Amps (A): 20, 30, 40, 50, 60, 70, 80, 100
2935 Series
Auto Link PAL 2935 Series Fuse
Amps (A): 25, 30, 45, 65, 75
2938 Series
Auto Link PAL 2938 Series Fuse
Amps (A): 20, 30, 40, 50, 60, 70, 80
294 Series
Auto Link PAL 294 Series Fuse
Amps (A): 30, 40, 50, 60, 70, 80, 100, 120
294C Series
Auto Link PAL 294C Series Fuse
Amps (A): 20, 30, 40, 50, 60, 70, 80, 100, 120
295 Series
Auto Link PAL 295 Series Fuse
Amps (A): 20, 30, 40, 50, 60, 70, 80, 100, 120,
140
283B Series
Auto Link PAL 283B Series Fuse
Amps (A): 20, 30, 40, 50, 60, 70, 80, 100,
120, 140
283 Series
Auto Link PAL 283 Series Fuse
Amps (A): 20, 30, 40, 50, 60, 70, 80, 100,
120, 140
littelfuse.com 42
LC High Voltage Fuse 43
LC High Voltage 50A Fuse 45
High Voltage Fuses
littelfuse.com
43
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
High Voltage Fuses
Time-Current Characteristic Curves
10
100
1000
O
NDS
LC HEV FUSE
10A
15A
20A
30A
40A
0.01
0.1
1
1 10 100 1000
TIME IN SEC
O
CURRENT IN AMPERES
Specifications
Voltage Rating (10A, 15A, 20A, 30A): 450 VDC
Voltage Rating (40A): 425 VDC
Note: The 0HEV040.ZXBD is rated at 450 VDC
Interrupting Rating (10A, 15A, 20A, 30A): 10kA @ 450 VDC
Interrupting Rating (40A): 10kA @ 425 VDC
Operating Temperature Range: -40ºC to +125ºC
Ordering Information
Part Number Termination Package
Size
0HEVxxx.ZXC Cartridge 240
0HEVxxx.ZXISO Bolt Down (ISO) 240
0HEVxxx.ZXPY Blade 240
0HEVxxx.ZXBD Bolt Down (Axial) 240
0HEVxxx.ZXPCB PCB Mount 240
0HEVxxx.ZXPCBL PCB Mount (Long) 240
Time-Current Characteristics
% of
Rating
Opening Time
Min / Max (s)
10A
Opening Time
Min / Max (s)
15A, 20A, 30A
Opening Time
Min / Max (s)
40A
100 100 hrs / - 100 hrs / - 100 hrs / -
110 4 hrs / - 4 hrs / - -
135 100 / 3600 150 / 3600 150 / 3600
150 10 / 1000 10 / 1000 10 / 1000
200 0.5 / 100 0.5 / 100 0.5 / 100
300 0.1 / 15 0.1 / 15 0.1 / 15
500 0.05 / 1 0.05 / 1 0.05 / 1
Ratings
Part Number
Current
Rating
(A)
Color
Code
Typical Voltage
Drop at 70% IR
(mV)
Maximum Voltage
Drop Spec at 100% IR
(mV)
Typical Cold
Resistance
(mΩ)
Minimum
Melting I²t
(A2s)
0HEV010.xxx 10 114 300 12.8 255
0HEV015.xxx 15 96 200 7.9 133
0HEV020.xxx 20 79 200 5.0 268
0HEV030.xxx 30 67 200 2.7 993
0HEV040.xxx 40 69 200 2.0 1495
(Average Initial Measurements)
Temperature Rerating Curve
0HEV040.ZXBD
Low Current HEV Fuse
The LC HEV fuse is designed for protection of high-voltage accessory circuits in electric
and hybrid electric vehicles.
Low Current HEV Fuses
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 44
High Voltage Fuses
Low Current HEV Fuse
Dimensions
Dimensions in mm
ZXBD Bolt Down (Axial)
ZXPY Blade
ZXISO Bolt Down (ISO)
ZXPCB PCB Mount
ZXC Cartridge
ZXPCBL PCB Mount (Long)
littelfuse.com
45
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
High Voltage Fuses
Specifications
Voltage Rating (50A): 275 VAC
Interrupting Rating (50A): 10,000A @ 275 VAC
Operating Temperature Range: -4C to +125˚C
Low Current High Voltage 50A Fuse
The LC HEV fuse is designed for protection of high-voltage accessory circuits in electric
and hybrid electric vehicles.
Low Current
High Voltage 50A Fuses
Ordering Information
Part Number Termination Package
Size
0HEVxxx.ZXISO2 Bolt Down (ISO) 240
0HEVxxx.ZXP2Y Blade 240
0HEVxxx.ZXPCB2 PCB Mount 240
0HEVxxx.ZXPCBL2 PCB Mount (Long) 240
0HEVxxx.ZXBD2 Bolt Down (Axial) 240
Time-Current Characteristics
% of Rating Opening Time Min / Max (s)
100 100 hrs / -
110 4 hrs / -
135 -
150 -
200 0.5 / 100
300 0.1 / 15
500 0.05 / 1
Ratings
Part
Number
Current
Rating
(A)
Voltage
Rating
(VAC)
Color
Code
Typical Voltage
Drop at 70% IR
(mV)
Maximum Voltage
Drop Spec at 100% IR
(mV)
Typical Cold
Resistance
(mΩ)
Minimum
Melting I²t
(A2s)
0HEV050.XXX 50 275 57 200 1.2 1495
Time-Current Characteristic Curves
10
100
1000
ONDS
275 VAC LC HEV FUSE
50A
Littelfuse, Inc. May 2012
0.01
0.1
1
0001001011
TIME IN SEC
CURRENT IN AMPERES
5040
Temperature Rerating Curve
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 46
High Voltage Fuses
Low Current High Voltage 50A Fuse
Dimensions
Dimensions in mm
ZXBD2 Bolt Down (Axial)
ZXP2Y Blade
ZXISO2 Bolt Down (ISO)
ZXPCB2 PCB Mount ZXPCBL PCB Mount (Long)
littelfuse.com
47
Shunts 48
Fuseholders 49
Specialty Products
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 48
Specialty Products
SHUNTS
Part Number Type
Max Continuous
Load Rating*
(A)
Housing Material Terminal Material Part Quantity
02400094PATO 35 Thermoplastic (UL 94V0) Brass Tin Plated 2000
0297900.WXNV MINI 20 Thermoplastic (UL 94V0) Zinc Silver Plated 3000
0327900.YX2S MICRO2 20 PA66 Zinc Silver Plated 4000
0337900.PX2S MICRO3 15 PA66 Zinc Silver Plated 2000
0495900_ JCASE 50 PA66 Copper Z=2200 pcs/X=1 pc
0695900.PXP MCASE+ Unslotted 30 PPA (33%/35% GF) Copper 2000
0695900.PXPS MCASE+ Slotted 50 PPA (33%/35% GF) Copper 2000
ATO® Shunt MINI® Shunt
JCASE® Shunt
Operating Temp.: -4C to +125˚C
Maximum Continuous Load Rating: 35A*
Housing Material: Thermoplastic
(UL 94V0 Rated)
Terminal Material: Brass Tin Plated
Operating Temp.: -4C to +125˚C
Maximum Continuous Load Rating: 20A*
Housing Material: Thermoplastic
(UL 94V0 Rated)
Terminal Material: Zinc Silver Plated
Operating Temp.: -4C to +125˚C
Maximum Continuous Load Rating: 50A*
Housing Material: PA66
Terminal Material: Copper
Operating Temp.: -4C to +125˚C
Maximum Continuous Load Rating: 20A*
Housing Material: PA66
Terminal Material: Ag plated zinc alloy
MICRO2® Shunt
*Rating varies based on mating terminal performance
MCASE+® Shunt
Operating Temp.: -4C to +125˚C
Maximum Continuous Load Rating Unslotted: 30A*
Maximum Continuous Load Rating Slotted: 50A*
Housing Material: PPA (33% / 35% GF)
Terminal Material: Copper
Operating Temp.: -4C to +125˚C
Maximum Continuous Load Rating: 15A*
Housing Material: PA66
Terminal Material: Ag plated zinc alloy
MICRO3® Shunt
littelfuse.com
49
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
I. Introduction
The purpose of this Fuseology section is to promote a better
understanding of fuses and some of the more common
application details. The fuses to be considered are current-
sensitive devices which are designed as the intentional weak
link in the electrical circuit. The function of a fuse is to provide
discrete component or complete circuit protection by reliably
melting under overcurrent conditions and thus safely
interrupting the flow of current.
II. Types of Overcurrents
An overcurrent is any current which exceeds the ampere
rating of wiring, equipment or devices under conditions of
use. The term “overcurrent” includes both overloads and
short circuits.
A. Overloads
An overload is an overcurrent which is confined to normal
current paths. An overload occurs when the current
exceeds the value for which the wires or equipment are
rated. This can happen when too many devices are
connected to the circuit, or when a device connected to the
circuit malfunctions in a way that causes it to draw higher
than normal current, usually in the range of one to six times
normal current. Sustained overloads eventually overheat
circuit components. Therefore, fuses must open circuits
experiencing sustained overloads before damage occurs.
B. Short Circuits
A short circuit is current out of its normal path. It occurs
when accident or malfunction creates an unintended path
for the electricity to flow from the battery or alternator to
ground. This shorter, more direct path to ground bypasses
the resistance normally offered by the wiring and devices
connected to the circuit. With virtually no resistance left to
impede current flow, the voltage forces higher and higher
current to flow through the wires to the point of the short.
Under such a condition, the current will quickly build to
such a high level that the heat generated can cause
insulation to burn and equipment to be damaged unless
the circuit is opened through the use of a fuse.
III. Fuse Selection Parameters
Since overcurrent protection is crucial to reliable electrical
system operation and safety, fuse selection and application
should be carefully considered. When selecting fuses, the
following parameters should be evaluated:
A. Voltage Rating
The voltage rating, as marked on a fuse, indicates the
maximum voltage of the circuit for which the fuse is
designed to operate safely in the event of an overcurrent.
Therefore, the fuse’s voltage rating must equal or exceed
the available circuit voltage where the fuse will be installed.
System voltage exceeding the fuse’s rated voltage may
result in fuse damage. The voltage rating is 32 volts DC
for the MINI®, MAXI®, ATO®, MIDI®, MEGA®, and
CABLEPRO® Fuses.
B. Interrupting Rating
The interrupting rating (also known as breaking capacity or
short circuit rating) is the maximum current, as stated by
the manufacturer, which the fuse can safely interrupt at
rated voltage. During a fault or short circuit condition, a
fuse may receive an instantaneous current many times
greater than its normal operating current. Safe operation
requires that the fuse remain intact (no body rupture) and
clear the circuit. The interrupting rating is 1000A @ 32 volts
DC for the MINI®, MAXI®, ATO®, JCASE®, and MIDI®
Fuses, and 2000A @ 32 volts DC for the MEGA® and
CABLEPRO® Fuses.
C. Time-Current Characteristics
A fuse’s time-current characteristics determine how fast it
responds to different overcurrents. All fuses have inverse
time-current characteristics, so opening time decreases as
overcurrents increase. Time-current characteristics are
presented graphically on standardized “log-log” paper.
Figure 1 is a sample time-current curve for the MAXI Fuse
series for fuses rated 20-60A. Current values increase
from left to right, and time increases from bottom to top.
The average melting time for any current can be determined
from the curve. For example, from Figure 1 it can be
determined that a 20A MAXI Fuse experiencing an overload
of 100A will open in about 0.5 seconds. At 40A, the same
20A MAXI Fuse would open in about 9 seconds.
Time-current curves are also used to compare fuses of the
same series but of different current ratings. Suppose it
was desired to compare the opening times of 20A and 60A
MAXI Fuses at an overload of 100A. From the curve in
Figure 1, one can see that the 20A fuse opens in about 0.5
seconds at 100 amps, whereas the 60A fuse does not
open until about 50 seconds.
Figure 1: Average Melting-
Current Curve for the MAXI
Fuse Series (20-60A)
Fuseology
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 50
It is important to note that time-current curves give only
average melting times and are presented as a design aid
but are not considered as part of the fuse specifications.
The term used in fuse design that describes how rapidly
a fuse responds to various overcurrents is the fuse’s
“characteristics.” Automotive fuse characteristics are
determined by the fuse’s degree of time delay. Initial or
start-up pulses are normal for many automotive applications
and require fuses to have a time delay designed in to enable
them to survive these pulses and still provide protection
against prolonged overloads. Fuses such as the MINI®
Fuse and ATO® Fuse have a moderate degree of time delay,
whereas fuses like the MAXI® Fuse and MEGA® Fuse have
a high degree of time delay which enables them to handle
high inrush currents like those caused by motor start-ups.
Figure 2 compares sample time-current curves of a 30A
MINI Fuse to a 30A MAXI Fuse. To see that the MAXI Fuse
has more time delay than the MINI Fuse, compare their
opening times at an overload of 100A. Despite the fact that
the fuses are the same rating, the MINI Fuse opens in about
0.1 seconds while the MAXI Fuse opens in about 2.2 seconds.
When selecting a fuse, the start-up pulse should be defined
and then compared to the time-current curve for the fuse.
D. Current Rating
The current rating is the maximum current which the fuse
can continuously carry under specified conditions.
1. Normal Operating Current
The current rating of a fuse is typically derated 25%
for operation at 25˚C to avoid nuisance blowing.
For example, a fuse with a current rating of 10A is not
usually recommended for operation at more than 7.5A
in a 25˚C ambient.
2. Rerating for Ambient Temperature
The current carrying capacity tests of fuses are
performed
at 25˚C & will be affected by changes in ambient
temperature.
At higher ambient temperatures, a fuse will respond
faster to a given overload. Conversely, at lower ambient
temperatures, a fuse will respond slower to a given
overload. In addition, the temperature of the fuse increases
as the normal operating current approaches or exceeds
the rating of the fuse.
A MINI Fuse operating at 25˚C and 110% of rated current
has a minimum life of 100 hours. However, if that same
fuse were operated at a very high ambient temperature,
rerating would be necessary. Figure 3 is a sample
temperature rerating curve for the MINI Fuse. The
following example shows how to use such a curve.
Suppose there is a normal operating current of 15
amperes in a particular circuit, and the ambient
temperature will be 105˚C instead of 25˚C. Which MINI
Fuse rating should be used? From Figure 3, the percent
of rated current to be used at an ambient temperature of
105˚C is 88%, so:
Ideal fuse rating = Normal operating current
Temp rerating factor x 0.75
= 15A
0.88 x 0.75
= 22.73A
Therefore, a 25A or larger MINI Fuse should be used.
E. Transient Overcurrent Considerations
Transient pulses of inrush current are commonplace in
vehicle electrical systems. The transient overcurrent pulses
affect the life of automotive fuses.
1000
100
10
1
0.1
0.01
100001000100101
TIME IN SECONDS
CURRENT IN AMPERES
30A MAXITM FUSE
30A MINITM FUSE
Figure 2: Average Melting-Current Curve Comparing 30A MINI Fuse to 30A
MAXI Fuse
Figure 3: MINI Auto Fuse 297 Series Temperature Rerating Curve
Fuseology
littelfuse.com
51
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
1. I2t
I2t is an expression of the available thermal energy resulting
from current flow. With regard to fuses, the term is usually
expressed as melting, arcing, and total clearing I2t. The units
for I2t are expressed in ampere-squared-seconds [A2s].
Melting I2t: the thermal energy required to melt a specific
fuse element.
Arcing I2t: the thermal energy passed by a fuse during the
arcing time. The magnitude of arcing I2t is a function of the
available voltage and stored energy in the circuit.
Total Clearing I2t: the thermal energy through the fuse from
overcurrent inception until current is completely interrupted.
Total clearing I2t = (melting I2t) + (arcing I2t).
I2t has two important applications to fuse selection. The first
is pulse cycle withstand capability and the second is selective
coordination.
2. Pulse Cycle Withstand Capability
Electrical pulses produce thermal cycling and possible
mechanical fatigue that could affect the life of the fuse.
For this reason, it is important to know the pulse cycle
withstand capability of the fuse, which is defined as the
number of pulses of a given I2t value that can be withstood by
the fuse without opening, assuming that there is sufficient cool
down time between pulses.
Figure 4 shows how I2t of the pulse can be calculated from the
graph of the pulse current as a function of time.
Figure 5 is a graph of the pulse cycle withstand capability of
blade fuses. Because electrical pulse conditions can vary
considerably from one application to another, application testing
is recommended to establish the ability of the fuse design to
withstand the pulse condition.
i = + kt
I
2
t = (1/5)ic
2
t
I2t= ib
2t - 2τib(ic-ib)(e-t/τ-1)-τ/2(ic-ib)2(e-2t/τ-1)
Natural decay to non-zero value
i
b
Figure 4: Evaluating the I²t of a Variety of Current Wave Shapes
33
100000
1000000
10000
1000
100
10
1
0.1 1
NUMBER OF PULSES
RELATIVE I
2
t
3 sigma confidence limit
Actual # of pulses
Figure 5: Pulse Cycle Withstand Capability for Blade Fuses
3. Selective Coordination
In a selectively coordinated system, only the fuse
immediately on the line side of an overcurrent opens.
Upstream fuses remain closed and undamaged. All other
equipment remains in service, which simplifies locating
overloaded equipment or short circuits. In Figure 6, if a
short circuit arises behind fuse #1, fuse #1 should open and
fuse #2 should stay closed and undamaged. The condition
necessary to assure this result is that the minimum melting
I2t of the supply side fuse (fuse #2) must be greater than
the total clearing I2t of the load side fuse (fuse #1). This
condition results in the load side fuse opening before the
supply side fuse begins to melt. Minimum melting and total
clearing I2t data are given in this catalog.
FUSE #2
FUSE
#1
SUPPLY SIDE
LOA
D
SIDE
Figure 6: Selective
Coordination for
Fuses in Series
Fuseology
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse
product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages
arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless
otherwise agreed by Littelfuse.
littelfuse.com 52
IV. Voltage Drop Across Terminals
A fuse is only as good as the system in which it is used.
One aspect of the electrical system that has considerable
effects on the performance of the fuse is the quality of the
connection between the fuse and the cable it protects.
High voltage drop across the fuse/terminal interface creates
additional thermal loading, which in turn causes shifts in the
time-current characteristics of the fuse. Table 1 below gives
the maximum recommended voltage drop per terminal for
automotive fuses. Figure 7 indicates the measurement
locations used to determine the voltage drop across the
terminal. The voltage drop across the left terminal would be
V2-4 and the voltage drop across the right terminal would be V1-3.
Type
Maximum Recommended Voltage Drop
Per Terminal [MV]
(between points 1-3 or 2-4)
ATO® FUSE 30
MINI® FUSE 30
MAXI® FUSE 30
MEGA® FUSE 15
V. Diffusion
Diffusion Pill Technology is a mixing of molecules, atoms or
crystals in the solid, liquid or gaseous state. Diffusion Pill
Technology is often used in the design of fuses for
automotive, electronic and industrial fuse applications.
“M-effect” is the method of diffusing one metal into another
to form a new alloy with a lower melting point. Littelfuse
uses the “M-effect” to produce three very desirable
characteristics in fuse designs: lower melting temperature,
time delay, and lower voltage drop.
By affixing a diffusion pill tin to the element, the melting
temperature is decreased. This decrease in melting
temperature reduces the fuse rating. In order to reestablish
its original rating the fuse elements’ cross section needs to
increase. An increase in cross section increases the blow
time at higher overload condition. A higher degree of time
delay enables a fuse to withstand higher current inrush
pulses. This increase in cross section reduces the overall
fuse resistance and voltage drop.
VI. Match Wire Gauge to Fuse
In order to protect wiring under all overload and short circuit
conditions, it is necessary to standardize the fuse and wire
selection process.
Fuses have controlled opening characteristics, and each wire
gauge has its respective current carrying capacity. Fuses need to
be selected to always protect the wire insulation from damage.
In the selection of wire gauge at various ambient
temperatures, it is important to consider the worst case or
highest ambient temperature for the application. Wires derate
to a much higher degree than fuses, because wire insulation
temperature capability is affected much more severely.
Maximum Recommended Continuous Current
Wire Size Max Continuous Current (A)
At 25˚C At 80˚C At 105˚C
mm² Gage No. GXL (1) GPT (2) GXL (1) GPT (2) GXL (1)
0.3 15 10 11 4 9
0.5 20 21 15 16 6 13
0.75 27 21 20 7 17
0.8 18 31 22 23 7 19
1 16 33 23 25 9 20
1.5 43 30 33 12 27
2 14 50 36 37 14 32
2.5 60 42 45 15 38
3 12 68 47 51 18 42
4 80 56 61 22 50
5 10 90 65 68 23 58
6 103 73 78 28 64
8 8 125 87 96 30 79
10 146 103 111 40 90
13 6 170 120 129 47 105
19 4 221 156 166 61 137
1
3
2
4
Figure 7: Measurement Locations along the Fuse/Terminal/Cable
System Used to Determaine the Voltage Drop across the Terminal
Table 1: Maximum Recommended Voltage Drop per Terminal
(1) = General purpose cross link polyethylene insulation wire with a
maximum insulation temperature of 155˚C.
(2) = General purpose thermoplastic insulation wire with a maximum
insulation temperature of 9C.
Fuseology
To assist you with your design and selection processes,
Littlefuse also offers:
Comprehensive Online Product Specs on Littelfuse.com
Featuring easy-to-use navigation, search and selection tools, as well as
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answers and continuously up-to-date information.
Printed Product Catalogs—For offline and off-the-shelf convenience, our
printed product catalogs include data sheets, selection tables and tutorials
covering all of our core technologies. Contact your Littelfuse product
representative or visit www.littelfuse.com/about-us/product-catalogs to
check availability.
Circuit Protection Design Guides—Our application-design center website,
www.littelfuse.com/technical-resources/application-designs offers a wealth
of circuit protection guidance to help you select and apply the best circuit
protection solution for your application.
Specifications descriptions and illustrative material in this literature are as accurate as known at the time of publication,
but are subject to changes without notice. Visit www.littelfuse.com for most up-to-date technical information.
© 2016 Littelfuse, Inc.
FORM NO. AA101
Littelfuse is the world leader in circuit protection. We offer an extensive selection of circuit protection technologies for
Automotive applications. Littelfuse circuit protection expert staff can assist you in designing circuit protection for your
most demanding applications. Solutions for over-current applications as well as over-voltage applications are available
from Littelfuse.
Low Current Distribution (LCD) MICRO2, MICRO3, LP MINI, MINI, ATOF, MAXI, MCASE, LP JCASE, JCASE
High Current Distribution (HCD) ZCASE MASTERFUSE, MASTERFUSE, ZCASE MEGA, MIDI, BF1, MEGA, CF
High Voltage Fuses (HEV) OHEV
Battery Cable Protection (BCP) CABLE PRO and BF-Inline products for mounting directly inline as part of a
high-power cable assembly
For more information, please contact your authorized Littelfuse product representative
or visit our website at www.littelfuse.com
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and deepest portfolio of circuit protection products and a global network
of technical support, backed by more than 85 years of application design
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