Fuse Datasheet 251/253 Series PICO II Very Fast-Acting Fuse PS E QPL Description The PICO II Very Fast-Acting Fuse is designed to meet an extensive array of performance characteristics in a space-saving subminiature package. Features and Benefits Very fast-acting Halogen-free available Small size Wide operating temperature range W ide current rating range (0.062A- 15A) Low temperature re-rating Applications Secondary protection for space constrained applications Additional Information Flatpanel display TV P ower supply LCD monitor Audio/Video system LCD backlight inverter Lighting system Office machines Medical equipment Resources Accessories Samples 251 Series 251 Series 251 Series Electrical Characteristics for Series % of Ampere Rating Ampere Rating Opening Time 100% 0.062A - 15A 4 Hours, Min. 0.062A - 7A 1 Second, Max. 200% 10A 3 Seconds, Max. Resources Accessories Samples 12 - 15A 10 Seconds, Max. 253 Series 253 Series 253 Series 0.500A, 1A, 2A, 275% 2.5A, 3A, 4A, 5A, 300 msecs., Max. Agency Approvals 7A, 10A 0.5A, 1A, 2A, 2.5A, Agency File/Certificate Number 400% 30 msecs., Max. 3A, 4A, 5A, 7A, 10A Agency Ampere Range 253 Series 251 Series 0.500A, 1A, 2A, 1000% 4 msecs., Max. N/A E10480 0.062A - 15A 2.5A, 3A, 4A, 5A N/A 29862 0.062A - 15A PS E N/A PSE NBK200416-JP1021 1A - 5A N/A J50158379 0.500A - 10A QPL FM10 N/A 0.062A - 15A 0.500A, 1A, 2A, N/A 2020970207000061 2.5A, 3A, 4A, 5A Note: See Electrical Specifications by Item table for specific approved ratings. 2021 Littelfuse, Inc. 1 Specifications are subject to change without notice. Revised: GD.10/11/21Fuse Datasheet 251/253 Series PICO II Very Fast-Acting Fuse Electrical Specifications by Item Agency Approvals Max Nominal Nom Ampere Ordering Ordering Nominal Amp Voltage Interrupting Cold Voltage QPL Rating Number Number Melting PS Code Rating Rating Resistance Drop 2 2 E (A) (Std.) (Mil.) I t (A sec) 253 Series (V) (Ohms) (V) Only .062 .062 251.062 253.062 125 7.000 0.000113 1.4 x x - - x - .125 .125 251.125 253.125 125 1.700 0.00174 0.285 x x - - x - .200 .200 251.200 253.200 125 0.895 0.0048 0.345 x x - - - - .250 .250 251.250 253.250 125 0.665 0.0116 0.24 x x - - x - .375 .375 251.375 253.375 125 0.395 0.0296 0.215 x x - - x - .500 .500 251.500 253.500 125 0.302 0.0598 0.2165 x x - x x x .630 .630 251.630 125 0.205 0.08 0.188 x x - - - - .750 .750 251.750 253.750 125 0.175 0.153 0.176 x x - x x - 300 A 1.00 001. 251001. 253001. 125 0.128 0.256 0.194 x x x x x x 125VDC 1.25 1.25 2511.25 125 0.100 0.390 0.2 x x x - - - 50A 1.50 01.5 25101.5 25301.5 125 0.0823 0.587 0.21 x x x x x - 125VAC 2.00 002. 251002. 253002. 125 0.0473 0.405 0.141 x x x x x x 2.50 02.5 25102.5 125 0.0360 0.721 0.132 x x x x - x 3.00 003. 251003. 253003. 125 0.0295 1.19 0.131 x x x x x x 3.50 03.5 25103.5 125 0.0240 1.58 0.1205 x x x x - - 4.00 004. 251004. 253004. 125 0.0204 2.45 0.114 x x x x x x 5.00 005. 251005. 253005. 125 0.0158 4.14 0.11 x x x x x x 7.00 007. 251007. 253007. 125 0.0107 10.4 0.102 x x - x x - 10.0 010. 251010. 253010. 125 0.0072 25.5 0.1 x x - x x - 12.0 012. 251012. 32 300A 32VDC 0.0059 45.2 0.0878 x x - - - - & 15.0 015. 251015. 253015. 32 0.00446 68.8 0.071 x x - - x - 50A 32VAC Note: Higher ampere ratings are available. Please contact Littelfuse Technical Support or your Littelfuse products representative for assistance. Temperature Re-rating Curve Average Time Current Curves 100 10 1 0.1 Note: 1. Re-rating depicted in this curve is in addition to the standard derating of 25% for continuous operation. 0.01 0.001 0.05 0.1 110100 1000 CURRENT IN AMPERES 2021 Littelfuse, Inc. 2 Specifications are subject to change without notice. Revised: GD.10/11/21 TIME IN SECONDS .062A .125A .250A .375A .500A .630A .750A 1A 1.25A 1.5A 2A 2.5A 3A 3.5A 4A 5A 7A 10A 12A 15A