Revised: January 20, 2009
337
© 2009 Littelfuse, Inc.
Specications are subject to change without notice.
Axial Lead & Cartridge Fuses
3AB > Fast-Acting > 505 Series
505 Series
Please refer to www.littelfuse.com/series/505.html for current information.
505 Series
505 Series, Lead-free 3AB, Fast-Acting Fuse
Features
Description
; 0$&&13'$0&(8,5+
60'(383,5(34$%13$513,(4
5$0'$3'!
; 7$,.$%.(,0&$353,'*($0'
$9,$..($')13/$0'8,5+
7$3,164.($')13/,0*
',/(04,104
; 1 &1/2.,$05$0'
($')3((
; 62(3,1305(33625,0*
3$5,0*1)/2(3(4
; 1/2$&5)13/)$&5131)
9//
; !0,05(33625,%.(18(3
622.,(4! 
; +$4(18(3 622.,(4
""3$5('&(3$/,&)64(8,5+3(/$3-$%.(,05(33625
,0*3$5,0*,0$&1/2$&59//2$&-$*(8+,&+,48(..
46,5(')13&,3&6,52315(&5,10,0+,*+(0(3*:$22.,&$5,104

/,065(4$9,/6/
/,065(4$9,/6/
4(&$9,/6/
Applications
Electrical Characteristics for Series
% of Ampere
Rating Ampere Rating Opening Time
%
%
%
Agency Approvals
Agency Agency File Number Ampere Range
(&1*0,4(',.(
 


Electrical Characteristics Specications by Item
Agency Approvals
Amp
Code
010.
012.
016.
020.
025.
030.
Amp
Rating
(A)
10
12
16
20
25
30
Max
Voltage
Rating
(V)
450
450
500
500
500
500
Nominal
Cold
Resistance
(Ohms)
0.0167
0.0117
0.0073
0.0056
0.0048
0.0038
Nominal
Melting
I2T (A2Sec.)
91
192
51
101
145
203
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Interrupting
Rating
20kA@450VAC
1000A@250VDC
50kA@500VAC
20kA@500VDC
30kA@500VAC
20kA@500VDC
Revised: January 20, 2009
Introduction to Circuit Protection
Introduction to Circuit Protection
Transientology
338 © 2009 Littelfuse, Inc.
Specications are subject to change without notice.
Axial Lead & Cartridge Fuses
3AB > Fast-Acting > 505 Series
505 Series
Please refer to www.littelfuse.com/series/505.html for current information.
0.001
0.01
0.1
1
10
100
1000
10000
1000100101
CURRENT IN AMPERES
TIME IN SECONDS
10A
12A
16A
20A
25A
30A
Soldering Parameters - Wave Soldering
Dwell Time
0
20
40
60
80
100
120
140
160
180
200
220
240
260
280
300
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
Time (Seconds)
Temperature (°C) - Measured on bottom side of board
Cooling Time
Preheat Time
Wave Parameter Lead-Free Recommendation
Preheat:
(Depends on Flux Activation Temperature) (Typical Industry Recommendation)
Temperature Minimum: 100°C
Temperature Maximum: 150°C
Preheat Time: 60-180 seconds
Solder Pot Temperature: 260°C Maximum
Solder Dwell Time: 2-5 seconds
Recommended Hand-Solder Parameters:
Solder Iron Temperature: 350° C +/- 5°C
Heating Time: 5 seconds max.
Note: These devices are not recommended for IR or
Convection Reow process.
Recommended Process Parameters:
Average Time Current Curves
Temperature Rerating Curve
Revised: January 20, 2009
339
© 2009 Littelfuse, Inc.
Specications are subject to change without notice.
Axial Lead & Cartridge Fuses
3AB > Fast-Acting > 505 Series
505 Series
Please refer to www.littelfuse.com/series/505.html for current information.
505 Series
Packaging
   
 
505 Series
Bulk
Bulk
N/A
N/A
N/A
N/A
1000
1000
MX
MXE
Part Numbering System
0505 xxxx
MX E
Series
Quantity Code
M = 1000
Amp Code
Refer to Amp Code column of
Electrical Characteristics Table
Option Codes
E : Axial Leaded
Others : special options.
Please call
Littelfuse for detail.
Lead-Free
Packaging Code
X = Filler
P
Dimensions
6.35 (.25”)
31.75
(1.25”)
505 000P Series 505 000EP Series
32.72
(1.288”)
6.985 (.275”) Max. 0.813 (.032”) (10 - 16A)
1.016 (.040”) (20- 30A)
38.1
(1.50”) TYP.
All Dimensions in mm
Product Characteristics
Operating Temperature –55ºC to +125ºC
Thermal Shock
MIL-STD-202G, Method 107G, Test
Condition B: (5 cycles –65
°C to
+125°C)
Vibration MIL-STD-202G, Method 201A
Humidity
MIL-STD-202G, Method 103B, Test
Condition A. high RH (95%) and
elevated temperature (40
°C) for 240
hours
Salt Spray MIL-STD-202G, Method 101D, Test
Condition B
Material
Body: Ceramic
Cap: Nickel–plated brass
Leads: Tin–plated Copper
Terminal Strength MIL-STD-202G, Method 211A, Test
Condition A
Solderability Reference IEC 60127 Second
Edition 2003-01 Annex A
Product Marking
Cap 1: Brand logo, current and volt-
age rating
Cap 2: Series and agency approval
markings
Packaging Available in Bulk (M=1000 pcs/pkg)