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1 of 12 hf specifcations voltage rating ac: 500v dc: 500v amperage rating 35 - 800 a interrupting rating ac: 200 ka dc: 50 ka time constant 10ms material body: melamine caps: copper alloy (silver plated) approvals ul recognized (e71611) c-ur-us (e71611) environmental rohs compliant, reach country of origin mexico operating temperature -55c to +125c storage temperature up to 35c with relative humidity <65% description the l50qs series is a next generation high-speed fuse for the protection of power semiconductor devices and is designed in the traditional north american bolted style package. l50qs series high-speed fuses are extremely current limiting and are used to protect power converters, drives and control circuit applications. designed with lower i 2 t performance characteristics, these fuses provide balanced performance to extend longevity while lowering potentially damaging heat energy to the devices being protected. in addition l50qs series fuses have been designed with a universal mounting option to meet customer requirements for installation into a variety of application configurations littelfuse powr- speed ? products offer optimized circuit protection at the extremely fast speed required to protect modern day, sensitive, high-power semiconductor devices. such products are commonly found in various industries including pulp and paper industries, cranes and heavy-lifting equipment, processing industries, wastewater treatment plants and large factories and mro facilities. features ? compliance with us and canadian requirements ? traditional north american bolted style dimensions ? class ar performance ? direct bus-bar mount or stud mount design ? halogen free, rohs and reach compliant applications ? power converters (inverters, rectifers) ? power supplies ? ups ? variable speed drives ? control circuits ? soft starters recommended fuse blocks lscr001 (35-200a) lscr002 (225-800a) 500 vac/dc ? 35-800 a ? traditional round body bolted style part numbering system l50 qs 500 x body type ampere code series package quantity x = 1 (450 - 800a) v = 5 (125 - 400a) t = 10 (35 - 100a) series body type ampere code package quantity catalog number ordering number l50 qs 500 1 l50qs500 l50qs500.x web resources download technical documents: littelfuse.com/l50qs littelfuse.com ? 2017 littelfuse powr-gard ? products rev: 110317 powr- speed ? fuse datasheet l50qs series high-speed round body fuses
2 of 12 electrical specifcations catalog number amperage rating voltage rating interrupt rating melting (pre-arc) i 2 t (a 2 s ) total clearing i 2 t (a 2 s ) total clearing i 2 t (a 2 s ) watts loss at 80% rated current watts loss at 100% rated current ac dc ac dc 200 k a @ 500 v ac 50 k a @ 500 v dc (w) (w) l50qs035 35 500 500 200ka 50ka 111 430 290 3 5 l50qs040 40 500 500 200ka 50ka 137 530 363 3 9 l50qs050 50 500 500 200ka 50ka 211 770 516 5 8 l50qs060 60 500 500 200ka 50ka 269 1,500 881 5 9 l50qs070 70 500 500 200ka 50ka 393 1,775 1,185 6 11 l50qs080 80 500 500 200ka 50ka 616 3,550 1,720 6 11 l50qs090 90 500 500 200ka 50ka 720 4,075 1,990 8 14 l50qs100 100 500 500 200ka 50ka 905 4,577 2,313 9 17 l50qs125 125 500 500 200ka 50ka 1,503 7,6 5 5 4,815 10 17 l50qs150 150 500 500 200ka 50ka 2,382 11,100 7,19 0 12 21 l50qs175 175 500 500 200ka 50ka 3,148 16,500 9,900 14 25 l50qs200 200 500 500 200ka 50ka 4,102 18,233 11,567 17 32 l50qs225 225 500 500 200ka 50ka 5,379 25,300 16,700 19 35 l50qs250 250 500 500 200ka 50ka 7,0 9 4 31,350 22,500 20 37 l50qs275 275 500 500 200ka 50ka 9,655 40,175 30,177 21 39 l50qs300 300 500 500 200ka 50ka 11,240 53,800 36,150 25 46 l50qs325 325 500 500 200ka 50ka 13,183 56,250 41,000 27 51 l50qs350 350 500 500 200ka 50ka 14,246 68,850 44,800 30 61 l50qs400 400 500 500 200ka 50ka 21,155 100,300 67,300 33 65 l50qs450 450 500 500 200ka 50ka 26,425 121,000 84,650 35 63 l50qs500 500 500 500 200ka 50ka 31,747 141,000 103,500 39 72 l50qs600 600 500 500 200ka 50ka 43,922 193,500 128,000 49 92 l50qs700 700 500 500 200ka 50ka 75,597 314,000 230,000 51 92 L50QS800 800 500 500 200ka 50ka 92,717 393,500 280,000 63 117 littelfuse.com ? 2017 littelfuse powr-gard ? products rev: 110317 powr- speed ? fuse datasheet l50qs series high-speed round body fuses
3 of 12 series amperage rating ampere code catalog number ordering number pack quantity upc l50qs 35 035 l50qs035 l50qs035.t 10 pcs/ box 07945885991 l50qs 40 040 l50qs040 l50qs040.t 10 pcs/ box 07945885992 l50qs 50 050 l50qs050 l50qs050.t 10 pcs/ box 07945885993 l50qs 60 060 l50qs060 l50qs060.t 10 pcs/ box 07945885994 l50qs 70 070 l50qs070 l50qs070.t 10 pcs/ box 07945885995 l50qs 80 080 l50qs080 l50qs080.t 10 pcs/ box 07945885996 l50qs 90 090 l50qs090 l50qs090.t 10 pcs/ box 07945885997 l50qs 100 100 l50qs100 l50qs100.t 10 pcs/ box 07945885998 l50qs 125 125 l50qs125 l50qs125.v 5 pcs/ box 07945885999 l50qs 150 150 l50qs150 l50qs150.v 5 pcs/ box 07945886000 l50qs 175 175 l50qs175 l50qs175.v 5 pcs/ box 07945886001 l50qs 200 200 l50qs200 l50qs200.v 5 pcs/ box 07945886002 l50qs 225 225 l50qs225 l50qs225.v 5 pcs/ box 07945886003 l50qs 250 250 l50qs250 l50qs250.v 5 pcs/ box 07945886004 l50qs 275 275 l50qs275 l50qs275.v 5 pcs/ box 07945886005 l50qs 300 300 l50qs300 l50qs300.v 5 pcs/ box 07945886006 l50qs 325 325 l50qs325 l50qs325.v 5 pcs/ box 07945886011 l50qs 350 350 l50qs350 l50qs350.v 5 pcs/ box 07945886007 l50qs 400 400 l50qs400 l50qs400.v 5 pcs/ box 07945886008 l50qs 450 450 l50qs450 l50qs450.x 1 pc/ box 07945886009 l50qs 500 500 l50qs500 l50qs500.x 1 pc/ box 07945886010 l50qs 600 600 l50qs600 l50qs600.x 1 pc/ box 07945886012 l50qs 700 700 l50qs700 l50qs700.x 1 pc/ box 07945886013 l50qs 800 800 L50QS800 L50QS800.x 1 pc/ box 07945886014 ordering information littelfuse.com ? 2017 littelfuse powr-gard ? products rev: 110317 powr- speed ? fuse datasheet l50qs series high-speed round body fuses
4 of 12 dimensions millimeters [inches] document number: ol-l50qs000 3 .1 8 [ 0 .1 2 5 ] 2 5 .4 0 [ 1 .0 0 0 ] 1 7 .0 2 [ 0 .6 7 0 ] 9 2 .0 8 [ 3 .6 2 5 ] 5 3 .9 8 [ 2 .1 2 5 ] 7 6 .1 9 [ 2 .9 9 9 ] 6 5 .0 7 [ 2 .5 6 2 ] 8 .7 3 [ 0 .3 4 4 ] 3 5 - 1 0 0 a 4 .7 5 [ 0 .1 8 7 ] 3 0 .9 4 [ 1 .2 1 8 ] 2 2 .7 3 [ 0 .8 9 5 ] 9 2 .0 8 [ 3 .6 2 5 ] 7 3 .8 6 [ 2 .9 0 8 ] 7 0 .3 2 [ 2 .7 6 8 ] 5 3 .9 8 [ 2 .1 2 5 ] 8 .7 4 [ 0 .3 4 4 ] 1 2 5 - 2 0 0 a 6 .3 5 [ 0 .2 5 0 ] 3 8 .1 0 [ 1 .5 0 0 ] 2 5 .2 7 [ 0 .9 9 5 ] 1 1 0 .3 1 [ 4 .3 4 3 ] 8 7 .3 7 [ 3 .4 4 0 ] 6 9 .8 3 [ 2 .7 4 9 ] 5 3 .1 6 [ 2 .0 9 3 ] 1 0 .4 1 [ 0 .4 1 0 ] 2 2 5 - 4 0 0 a 6 .35 [ 0 .2 5 0 ] 5 0 .8 0 [ 2 .0 0 0 ] 1 1 3 .4 9 [ 4 .4 6 8 ] 9 2 .8 2 [ 3 .6 5 4 ] 7 0 .8 6 [ 2 .7 9 0 ] 5 6 .34 [ 2 .2 1 8 ] 1 0 .4 1 [ 0 .4 1 0 ] 3 8 .10 [ 1 .5 0 0 ] 4 5 0 - 6 0 0 a 9 .5 3 [ 0 .3 7 5 ] 6 3 .5 0 [ 2 .5 0 0 ] 5 0 .8 0 [ 2 .0 0 0 ] 1 5 7 .1 5 [ 6 .1 8 7 ] 1 2 6 .9 3 [ 4 .9 9 7 ] 8 7 .3 0 [ 3 .4 3 7 ] 5 6 .3 4 [ 2 .2 1 8 ] 1 3 .4 6 [ 0 .5 3 0 ] 7 0 0 - 8 0 0 a ? ? ? ? ? stud size: m8 (5/16) recommended torque: 15 nm (132.76 in-lb) stud size: m8 (5/16) recommended torque: 15 nm (132.76 in-lb) stud size: m8 (5/16) recommended torque: 15 nm (132.76 in-lb) stud size: m8 (5/16) recommended torque: 15 nm (132.76 in-lb) stud size: m12 (1/2) recommended torque: 54 nm (477.94 in-lb) littelfuse.com ? 2017 littelfuse powr-gard ? products rev: 110317 powr- speed ? fuse datasheet l50qs series high-speed round body fuses
5 of 12 time current curve l50qs series 100 90 80 70 60 50 100 90 80 70 60 50 100000 90000 80000 70000 60000 50000 40000 30000 20000 10000 9000 8000 7000 6000 5000 4000 3000 2000 1000 900 800 700 600 500 400 300 200 100 90 80 70 60 50 40 30 20 10 9 8 7 6 5 4 3 2 1 50 40 30 20 10 9 8 7 6 5 50 40 30 20 10 9 8 7 6 5 4 3 2 1 0.9 0.8 0.7 0.6 0.5 04 4 3 2 1 0.9 0.8 0.7 0.6 0.5 04 c onds - 60a - 50a - 40a 0 . 4 0.3 0.2 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0 . 4 0.3 0.2 0.1 0.09 0.08 0.07 0.06 0.05 0.04 r e \ arcing) ? time ? in ? se c - 35a 0.03 0.02 0.01 0.009 0.008 0.007 0.006 0.005 0.004 0.03 0.02 0.01 0.009 0.008 0.007 0.006 0.005 0.004 melting ? (p r 0.003 0.002 0.001 0.0009 0.0008 0.0007 0.0006 0.0005 0.0004 0 0003 0.003 0.002 0.001 0.0009 0.0008 0.0007 0.0006 0.0005 0.0004 0 0003 0 . 0003 0.0002 0.0001 0 . 0003 0.0002 0.0001 100000 90000 80000 70000 60000 50000 40000 30000 20000 10000 9000 8000 7000 6000 5000 4000 3000 2000 1000 900 800 700 600 500 400 300 200 100 90 80 70 60 50 40 30 20 10 9 8 7 6 5 4 3 2 1 prospective ? r.m.s ? current ? in ? ampere basis for data: test voltage: 500v time constant/power factor: fuse catalog number: drawn by: date: revision: drawing no.: sheet tim e ? curr e nt charact e ristic ? curv e s littelfuse,? inc. chicago, ? il. ? usa lll 10/14/2015 a 2 of 4 fcc01 - l50qs l50qs 35a - 800a - this data is generated in excel - time ? current characteristic curves fcc01 l50qs littelfuse.com ? 2017 littelfuse powr-gard ? products rev: 110317 powr- speed ? fuse datasheet l50qs series high-speed round body fuses
6 of 12 time current curve l50qs series 100 90 80 70 60 50 40 100 90 80 70 60 50 40 200000 100000 90000 80000 70000 60000 50000 40000 30000 20000 10000 9000 8000 7000 6000 5000 4000 3000 2000 1000 900 800 700 600 500 400 300 200 100 40 30 20 10 9 8 7 6 5 4 40 30 20 10 9 8 7 6 5 4 - 500a - 450a - 600a 4 3 2 1 0.9 0.8 0.7 0.6 0.5 0.4 4 3 2 1 0.9 0.8 0.7 0.6 0.5 0.4 c onds - 200a - 175a - 150a - 125a 0.3 0.2 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.3 0.2 0.1 0.09 0.08 0.07 0.06 0.05 0.04 r e \ arcing) ? time in ? se c 0.03 0.02 0.01 0.009 0.008 0.007 0.006 0.005 0.004 0 003 0.03 0.02 0.01 0.009 0.008 0.007 0.006 0.005 0.004 0 003 melting ? (p r 0 . 003 0.002 0.001 0.0009 0.0008 0.0007 0.0006 0.0005 0.0004 0.0003 0 . 003 0.002 0.001 0.0009 0.0008 0.0007 0.0006 0.0005 0.0004 0.0003 0.0002 0.0001 0.0002 0.0001 200000 100000 90000 80000 70000 60000 50000 40000 30000 20000 10000 9000 8000 7000 6000 5000 4000 3000 2000 1000 900 800 700 600 500 400 300 200 100 prospective ? r.m.s ? current ? in ? ampere basis for data: test voltage: 500v time constant/power factor: fuse catalog number: drawn by: date: revision: drawing no.: sheet time current characteristic curves littelfuse,? inc. chicago, ? il. ? usa lll 10/14/2015 a 3 of 4 fcc01 - l50qs l50qs 35a - 800a - this data is generated in excel - time ? current characteristic curves fcc01 l50qs littelfuse.com ? 2017 littelfuse powr-gard ? products rev: 110317 powr- speed ? fuse datasheet l50qs series high-speed round body fuses
7 of 12 time current curve l50qs series 100 90 80 70 60 50 100 90 80 70 60 50 200000 100000 90000 80000 70000 60000 50000 40000 30000 20000 10000 9000 8000 7000 6000 5000 4000 3000 2000 1000 900 800 700 600 500 400 300 200 100 40 30 20 10 9 8 7 6 5 4 40 30 20 10 9 8 7 6 5 4 - 800a - 700a - 400a - 350a - 300a - 325a 4 3 2 1 0.9 0.8 0.7 0.6 0.5 0.4 4 3 2 1 0.9 0.8 0.7 0.6 0.5 0.4 c onds - 275a - 250a - 100a - 90a - 80a 70a - 225a 0.3 0.2 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.3 0.2 0.1 0.09 0.08 0.07 0.06 0.05 0.04 e \ arcing) ? time ? in ? se c - 70a 0.03 0.02 0.01 0.009 0.008 0.007 0.006 0.005 0.004 0 003 0.03 0.02 0.01 0.009 0.008 0.007 0.006 0.005 0.004 0 003 melting ? (pr 0 . 003 0.002 0.001 0.0009 0.0008 0.0007 0.0006 0.0005 0.0004 0.0003 0 . 003 0.002 0.001 0.0009 0.0008 0.0007 0.0006 0.0005 0.0004 0.0003 0.0002 0.0001 0.0002 0.0001 200000 100000 90000 80000 70000 60000 50000 40000 30000 20000 10000 9000 8000 7000 6000 5000 4000 3000 2000 1000 900 800 700 600 500 400 300 200 100 prospective r.m.s ? current ? in ? ampere basis for data: test voltage: 500v time constant/power factor: fuse catalog number: drawn by: date: revision: drawing no.: sheet time ? cu rrent c hara c teri s ti c ? cu rve s littelfuse,? inc. chicago, ? il. ? usa lll 10/14/2015 a 4 of 4 fcc01 - l50qs l50qs 35a - 800a - this data is generated in excel - cu c c sc cu s fcc01 l50qs littelfuse.com ? 2017 littelfuse powr-gard ? products rev: 110317 powr- speed ? fuse datasheet l50qs series high-speed round body fuses
8 of 12 peak let-thru curve l50qs series 100,000 90,000 80,000 70,000 60,000 50,000 40,000 30,000 20,000 10,000 9,000 8,000 7,000 6,000 5,000 4,000 3,000 2,000 100,000 90,000 80,000 70,000 60,000 50,000 40,000 30,000 20,000 10,000 9,000 8,000 7,000 6,000 5,000 4,000 3,000 2,000 200,000 100,000 90,000 80,000 70,000 60,000 50,000 40,000 30,000 20,000 10,000 9,000 8,000 7,000 6,000 5,000 4,000 3,000 2,000 1,000 900 800 700 600 500 400 300 200 100 peak let- thru in amperes 800a - 600a - 400a - 200a - 100a - 60a - 1,000 900 800 700 600 500 400 300 200 100 1,000 900 800 700 600 500 400 300 200 100 200,000 100,000 90,000 80,000 70,000 60,000 50,000 40,000 30,000 20,000 10,000 9,000 8,000 7,000 6,000 5,000 4,000 3,000 2,000 1,000 900 800 700 600 500 400 300 200 100 available fault current symmetrical r.m.s. amperes basis for data: test voltage: time constant/power factor: fuse catalog number: drawn by: date: revision: drawing no.: sheet peak ? let \ thru ? characteristic ? curves littelfuse, ? inc. chicago, ? il.? usa lll 10/13/2015 a 2 of 2 fcc05-l50qs l50qs 60a - 800a - data generated in excel - littelfuse.com ? 2017 littelfuse powr-gard ? products rev: 110317 powr- speed ? fuse datasheet l50qs series high-speed round body fuses
9 of 12 temperature de-rating curve (temperature of air immediately surrounding fuse) l50qs series - this data is generated in ex cel - basis for data : test voltage: time constant/pow er factor:f use catalog number : draw n by : date: revision: drawi ng no.: sheet temperature re-rating curv e littelfuse, inc. chicago, il. us a lll 08/14/2017 a 2 of 2 fcc11-l50qs l50qs series percent of downrating 0 20% 140 c 284 f 0 20% 120 c 248 f 80c 176 f 40c 104 f -20c -4f -40c -40f -60c -76f 40% 0c 32f 20c 68f 100 c 212 f 60c 140 f percent of upratin g ambient temperatur e 10% 30% 10% 30% 50% littelfuse.com ? 2017 littelfuse powr-gard ? products rev: 110317 powr- speed ? fuse datasheet l50qs series high-speed round body fuses
10 of 12 total clearing i 2 t correction factor curve l50qs series 1 0.9 1 0.9 500 400 300 200 100 0.8 0.7 0.6 0.8 0.7 0.6 0.5 0.4 0.5 0.4 a ctor 0.3 0.3 ing ? i 2 t ? correction ? f a - 35a - 800a 0.2 0.2 total ? clear 0.1 0.1 500 400 300 200 100 operating voltage ? in ? volt basis for data: test voltage: time constant/power factor: fuse catalog number: drawn by: date: revision: drawing no.: sheet i 2 t ? corr e ction ? factor littelfuse,? inc. chicago, ? il. ? usa lll 01/26/2015 a 3 of 3 fcc0 - l50s 35-800a basis for data: test voltage: 100v - 500v time constant/power factor: fuse catalog number: drawn by: date: revision: drawing no.: sheet i 2 t ? variation curv e s littelfuse,? inc. chicago, ? il. ? usa lll 10/30/2015 a 2 of 2 fcc07 - l50qs l50qs 35a - 800a - this data is generated in excel - i2t ? correction factor fcc0 i2t variation curves fcc07 l50qs littelfuse.com ? 2017 littelfuse powr-gard ? products rev: 110317 powr- speed ? fuse datasheet l50qs series high-speed round body fuses
11 of 12 watts loss correction factor curve l50qs series 1 0.9 1 0.9 100 90 80 70 60 50 40 30 0.8 0.7 0.6 0.8 0.7 0.6 0.5 0.4 0.5 0.4 t or 0.3 0.3 o ss correction ? fac t - 35a - 800a 0.2 0.2 watts ? l o 0.1 0.1 100 90 80 70 60 50 40 30 percent of ? rated ? current ? (%) basis for data: test voltage: time constant/power factor: fuse catalog number: drawn by: date: revision: drawing no.: sheet i 2 t ? corr e ction ? factor littelfuse,? inc. chicago, ? il. ? usa lll 01/26/2015 a 3 of 3 fcc0 - l50s 35-800a basis for data: test voltage: 500v time constant/power factor: fuse catalog number: drawn by: date: revision: drawing no.: sheet de rating curv e ?\ watts l oss ? corr e ction littelfuse,? inc. chicago, ? il. ? usa lll 10/30/2015 a 2 of 2 fcc08 - l50qs l50qs 35a-800a - this data is generated in excel - i2t ? correction factor fcc0 derating curve watts loss correction fcc08 l50qs littelfuse.com ? 2017 littelfuse powr-gard ? products rev: 110317 powr- speed ? fuse datasheet l50qs series high-speed round body fuses
12 of 12 peak arc voltage curve l50qs series 1000 900 1000 900 500 400 300 200 100 800 700 600 800 700 600 500 400 500 400 t 300 300 arc ? voltage ? in ? vol t 200 200 peak ? 100 100 500 400 300 200 100 operating ? voltage ? in ? volts basis for data: test voltage: time constant/power factor: fuse catalog number: drawn by: date: revision: drawing no.: sheet arc ? voltage littelfuse,? inc. chicago, ? il. ? usa lll 01/26/2015 a 3 of 3 fcc0- l70s 35-800a basis for data: test voltage: 100v-500v time constant/power factor: fuse catalog number: drawn by: date: revision: drawing no.: sheet max? arc ? voltage ? variation ? curve littelfuse,? inc. chicago, ? il. ? usa lll 10/30/2015 a 2 of 2 fcc09-l50qs l50qs 35a - 800a - this data is generated in excel - disclaimer notice - 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/product-disclaimer littelfuse.com ? 2017 littelfuse powr-gard ? products rev: 110317 powr- speed ? fuse datasheet l50qs series high-speed round body fuses

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