High Speed Fuses British BS 88 240V: 6-900A Arc Voltage 750 LCT, LET, LMT, LMMT U L This curve gives the peak Specifications 1) arc voltage, U , which L Description: BS 88 style 500 may appear across the stud-mount fuses. fuse during its operation 2) Dimensions: See dimensions as a function of the illustrations. applied working voltage, 250 Ratings: E , (rms) at a power factor g Volts: 240Vac/150Vdc of 15%. E g Amps: 6-900A Power Losses 100 200 300 IR: 200kA RMS Sym. 1) LCT Watts loss at rated current 2) LET, LMT, LMMT Agency Information: CE, Designed and tested to: BS 88 is given in the electrical 1.0 Part 4, IEC 269 Part 4, UL Recognized. All fuses above have Kp characteristics. The curve 0.8 been tested at 318Vac. Consult Cooper Bussmann for allows the calculation of 0.6 specific UL Recognition status. 0.5 the power losses at load 0.4 currents lower than the Electrical Characteristics 1.6 rated current. The correc- 0.3 2 K Total Clearing I t tion factor, K , is given as 1.4 p 0.2 2 a function of the RMS load The total clearing I t at rated 1.2 current, I , in % of the voltage and at power factor b 1.0 rated current. I of 15% are given in the b 0.1 0.8 30 40 50 60 70 80 90 100% electrical characteristics. For Catalog Numbers 0.6 other voltages, the clearing EElleeccttrriiccaall CChhaarraacctteerriissttiiccss 1) 2 22 22 RRaatteedd II tt ((AA SSeecc)) I t is found by multiplying by 0.4 CCaattaalloogg CCuurrrreenntt CClleeaarriinngg CClleeaarriinngg WWaattttss correction factor, K, given as 0.2 NNuummbbeerrss TTyyppee RRMMSS--AAmmppss PPrree--aarrcc aatt 112200VV aatt 224400VV LLoossss 2) a function of applied working E g 6LCT 6 2 6 9 1.0 voltage, E , (rms). 10LCT 10 3.8 12 22 2.5 50 100 150 200 250 g 12LCT LCT 12 7 22 32 2.5 1) LCT 2) LET, LMT, LMMT 16LCT 16 20 50 100 2.5 20LCT 20 25 80 160 4.0 Dimensions (mm) 25LET 25 18 120 250 4.0 Fig. 2: LET 32LET 32 32 200 450 5.0 7.1 Fig. 1: LCT 35LET 35 50 320 600 5.0 4 50LET 50 100 500 1400 7.0 5.5 63LET LET 63 180 1100 2200 9.0 80LET 80 300 1900 3800 10.0 26.2 41.8 56 100LET 100 600 3800 7500 10.0 28 38 47 125LET 125 600 3800 7500 16.0 160LET 160 1100 7000 16000 20.0 9.7 180LETa 180 1600 12000 29000 21.0 12.7 160LMT 160 1100 7000 16000 17.0 6.4 17.7 200LMT 200 1500 10000 20000 28.0 250LMT 250 3200 20000 40000 28.0 8.4 19.1 Fig. 4: LMMT 315LMT LMT 315 6000 35000 75000 35.0 8.7 355LMT 355 8000 50000 100000 35.0 Fig. 3: LMT 25.4 400LMT 400 14000 70000 160000 40.0 1mm = 0.0394 / 1 = 25.4mm 25.4 450LMT 450 18000 100000 220000 42.0 400LMMT 400 6000 35000 80000 60.0 500LMMT 500 14000 80000 170000 64.0 630LMMT 630 24000 150000 300000 75.0 31 59 84 LMMT 710LMMT 710 32000 200000 460000 77.0 31 59 84 800LMMT 800 52000 300000 600000 82.0 900LMMT 900 75000 400000 800000 97.0 Watts loss provided at rated current. 13.5 Note: 7LET, 10LET, 12LET and 16LET are available for replacement purposes on existing 13.5 10.3 equipment. 10.3 See accessories on page 195. Typical Applications Features and Benefits 41 DC common bus 83 Excellent cycling capability AC and DC drives Excellent DC performance 38.1 Power converters/rectifiers Low arc voltage and low Indicator (Optional) 38 2 Reduced voltage starters energy let-through (I t) Data Sheet: 720004 For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa 188High Speed Fuses High Speed Fuses British BS 88 240V: 6-900A LCT 6-20A: 240V LET 25-180A: 240V Time-Current Curve Time-Current Curve 4 4 10 10 6 6 4 4 2 2 3 3 10 10 6 6 4 4 2 6LCT 2 10LCT 2 2 10 10 12LCT 80LET 6 6 16LCT 100LET 4 4 20LCT 125LET 2 2 160LET 1 1 180LETa 10 10 6 6 4 4 25LET 2 2 32LET 0 35LET 0 10 10 50LET 6 6 63LET 4 4 2 2 1 1 10 10 6 6 4 4 2 2 2 2 10 10 6 6 4 4 2 2 3 3 10 10 6 6 4 4 2 2 4 10 4 10 24 68 242 68 242 68 22468 22468 1 2 3 1 2 3 10 10 10 10 10 10 Prospective Current In Amps RMS Prospective Current In Amps RMS Data Sheet: 35785296 Data Sheet: 35785293 Peak Let-Through Curve 2 5 10 900LMMT 800LMMT 6 710LMMT 630LMMT 4 450LMT 400 & 500LMMT 2 355LMT 315LMT 250LMT 4 10 180LET 200LMT 6 160LET & LMT 4 125 & 100LET 80LET 2 3 10 6 4 63LET 2 50LET 35LET 2 32LET 10 25LET 20LCT 6 16LCT 4 12LCT 10LCT 6LCT 2 SYMMETRICAL FAULT FULLY ASYMMETRICAL FAULT 1 10 264246 246 246 1 2 3 4 5 10 10 10 10 10 Prospective Short-Circuit Current Symmetrical RMS For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa 189 Virtual Pre-Arcing Time In Seconds Peak Let-Through Current Virtual Pre-Arcing Time In Seconds