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Cartridge, Axial Lead, and Socket Fuses
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com for the most current information Revised: April 23, 2008
251/253 Series
PICO® II > Very Fast-Acting > 251/253 Series
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com/series/251.html or /253.html for current information.
251/253 Series, PICO® II, Very Fast-Acting Fuse
Description
The PICO® II very fast-acting fuse is designed to meet an
extensive array of performance characteristics in a
space-saving subminiature package.
Agency Approvals
Agency Agency File Number Ampere Range
E10480 62mA - 15A
LR 29862 62mA - 15A
PS
EJET 1896-31007-1001 1A - 5A
TUV J02037794 500mA - 10A
Features
Electrical Characteristics
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(62mA- 15A)
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temperature range
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% of Ampere
Rating Ampere Rating Opening Time
100% 1/16–15 4 hours, Minimum
200%
1/16–7 1 sec., Maximum
10 3 sec., Maximum
12-15 10 sec., Maximum
Applications
Ampere
Rating
(A)
Amp
Code
Ordering
Number
(Std.)
Ordering
Number
(Mil.)
Max
Voltage
Rating
(V)
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
Nominal
Melting
I2t (A2 sec)
Nom
Voltage Drop
(mV)
Agency Approvals
PS
ETUV
1/16 .062 251.062 253.062 125
300 amperes
at rated
voltage VDC
50 amperes at
rated voltage
VAC
7.000 0.000113 1. 4 x x
1/8 .125 251.125 253.125 125 1.700 0.00174 0.285 x x
1/4 .250 251.250 253.250 125 0.665 0.0116 0.24 x x
3/8 .375 251.375 253.375 125 0.395 0.0296 0.215 x x
1/2 .500 251.500 253.500 125 0.280 0.0598 0.2165 x x x
3/4 .750 251.750 253.750 125 0.175 0.153 0.176 x x x
1 001. 251001. 253001. 125 0.128 0.256 0.194 x x x x
11/4 1.25 2511.25 125 0.100 0.390 0.2 x x x x
11/2 01.5 25101.5 25301.5 125 0.0823 0.587 0.21 x x x x
2 002. 251002. 253002. 125 0.0473 0.405 0.141 x x x x
21/2 02.5 25102.5 125 0.0360 0.721 0.132 x x x x
3 003. 251003. 253003. 125 0.0290 1.19 0.131 x x x x
31/2 03.5 25103.5 125 0.0240 1.58 0.1205 x x x x
4 004. 251004. 253004. 125 0.0204 2.45 0.114 x x x x
5 005. 251005. 253005. 125 0.0155 4.14 0.11 x x x x
7 007. 251007. 253007. 125 0.0105 10.4 0.102 x x x x
10 010. 251010. 253010. 125 0.00705 25.5 0.1 x x x x
12 012. 251012. 32 0.0055 45.2 0.0878 x x x
15 015. 251015. 253015. 32 0.00446 68.8 0.071 x x x
Electrical Characteristics
Note: Higher ampere ratings are available. Please contact Littelfuse Technical Support or your Littelfuse products representative for assistance.
RoHS
PS
E
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Secondary protection for space constrained applications
TUV