revised: january 7, 2009 345 ? 2009 littelfuse, inc. speci?cations are subject to change without notice. special application fuses alarm indicating fuse 481 series 481 series alarm indicating fuse please refer to www.littelfuse.com/series/481.html for current information. 481 series 481 series alarm indicating fuse description agency approvals agency agency file number e71611 lr 29862 electrical characteristics features t $ p m p s d p e f e j o e j d b u p s ?ags indicate ampere rating. t $ m f b s q m b t u j d m f o t option available for additional safety. t # p e z j t d p o t u s v d u f e p g black plolyphenylene sul?de with ul-94v0 ?ammability rating. t $ p o u b d u t n b e f p g bright alloy-plated beryillioum copper. applications % of ampere rating opening time 100% 10 minutes, minimum 150% 5 minutes, maximum electrical characteristics * 0.180a thru 1.5a items are not available for sale as a rohs compliant p option **20a fuseholder must be used. fuse is keyed to prevent insertion in lower rated holders. 20a fuseholder is designed to accept all ratings up to 20 amperes. ampere rating (a) amp code max voltage rating (v) interrupting rating body color code nominal cold resistance (ohms) nominal melting i 2 t (a 2 sec.) agency approvals 0.180* .180 125 vac & 125 vdc 450a @ 60 vdc 300a @ 125 vac (up to 20a) 300a @ 125 vdc (up to 15a) 200a @ 125 vdc (up to 20a) yellow 6.25 0.00808 x x 0.200* .200 red/black 5.70 0.0140 x x 0.250* .250 violet 4.20 0.0356 x x 0.375* .375 gray/white 2.00 0.028 x x 0.500* .500 red 1.52 0.139 x x 0.650* .650 black 1.25 0.278 x x 0.750* .750 brown .980 0.363 x x 1.00* 001. gray .665 0.733 x x 1.33* 1.33 white .480 1.58 x x 1.50* 01.5 yellow/white .385 2.55 x x 2.00 002. orange .120 5.29 x x 2.50 02.5 orange/white .0904 9.46 x x 3.00 003. blue .0670 11.2 x x 3.50 03.5 blue/white .0415 10.5 x x 4.00 004. brown/white .0350 15.4 x x 5.00 005. green .0285 26.2 x x 7.50 07.5 black/white .0113 42.8 x x 10.0 010. red/white .00840 115.3 x x 12.0 012. green/yellow .00660 222.5 x x 15.0 015. red/blue .00580 294.22 x x 20.0** 020. green/white .00394 570.0 x x ideal for telecommunications and control panel circuits 481 series alarm indicating fuses are designed to reduce down time by immediately pinpointing the blown (open) circuit while triggering an led or audio alarm. this item requires 482 series mating fuse holder. all ranges of 481 series fuses are available as our original design, and the 2-20 amp range is now available as a rohs compliant option (use the p designator when ordering). see the part numbering section of this data sheet for related ordering instructions.
revised: january 7, 2009 introduction to circuit protection introduction to circuit protection transientology 346 ? 2009 littelfuse, inc. speci?cations are subject to change without notice. special application fuses alarm indicating fuse 481 series 481 series alarm indicating fuse please refer to www.littelfuse.com/series/481.html for current information. average time current curves 1000 100 10 1 0.1 0.01 1000 100 10 1 0.1 18/100 a 1/4 a 1/2 a 6 5 /100 a 3/4 a 1 a 1 1/3 a 2 a 3 a 4 a 5 a 7 1/2 a 10 a 12 a 1 5 a 20 a time in seconds current in amperes material body: polyphenylene sul?de (ul 94vo) terminations: beryllium copper/tin plated optional lens: nylon vibration per mil-std-202f product characteristics product characteristics dimensions part numbering system *20a fuseholder must be used. fuse is keyed to prevent insertion in lower rated holders. 20a fuseholder is designed to accept all ratings up to 20 amperes. 22.9 mm (.90") min. 8 mm . 23") 5 .3 mm (.21") 16.9 mm (.66 5 ") max. 11. 7 mm (.46") 17.8 mm (.70") 19.6 mm (.77") 21.3 mm (0.84") ref. lens 2.77 (.109") 2.79 (.110") 4.4 5 (.17 5 ") 1-1 5 a 20a* operating temperature C 55 o c to 90 o c. thermal shock withstands 5 cycles of C 55 o c to 125 o c insulation resistance (after opening) greater than 10,000 ohms. option code: rohs item option code: series amp code quantity code: blank = standard xl = protective lens blank = standard design item p = rohs compliant version item (available in 2-20 amp range only) 0 4 81 .180 h xl p v = 5 pack h = 100 pack (see electrical characteristics table)
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