High Speed Fuses High Speed Fuses British BS 88 Fuses General Information Introduction Designed and tested to: British BS 88 Contents • BS 88: Part 4 Fuse Amp • IEC 269: Part 4 Volts Range Page • UL Recognized 240 6-900 188-190 690 6-710 191-194 Cooper Bussmann offers the industry’s widest range of British style semiconductor fuses and accessories. Accessories Cooper Bussmann British style products use innovative arc Indicator System & Fuse Bases 195 quenching techniques and high grade materials to provide: 2 • Minimal energy let-through (I t) • Excellent DC performance British BS 88 Fuse Ranges • Good surge withstand profile A Am mp ps s V Va ac c V Vd dc c 6-900 240 150 British style fuses are typically found in equipment 6-710 690 500 manufactured in the United Kingdom or British Commonwealth countries. However, North American manufacturers have begun to specify British style fuses — particularly in UPS applications at 240V or less — to take advantage of their size, performance and cost benefits. Voltage Rating All Cooper Bussmann British style fuses are tested to IEC 269: Part 4. This standard requires a test voltage which is 5% higher than the rated voltage. In North America, fuses are required to clear only their rated voltage. Accessories Trip-indicator fuses are available for use in parallel with the main fuse. Indicator fuses can be attached to the associated fuselink, or mounted separately in panel-mounted fuseclips. In addition, a push-on adapter and microswitch attachment are available, to provide remote indication. Fuse blocks are also available for most applications. For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa 187 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 E Elle ec ct tr riic ca all C Ch ha ar ra ac ct te er riis st tiic cs s 1) 2 2 2 2 2 R Ra at te ed d II t t ( (A A S Se ec c) ) I t is found by multiplying by 0.4 C Ca at ta allo og g C Cu ur rr re en nt t C Clle ea ar riin ng g C Clle ea ar riin ng g W Wa at tt ts s correction factor, K, given as 0.2 N Nu um mb be er rs s T Ty yp pe e R RM MS S- -A Am mp ps s P Pr re e- -a ar rc c a at t 1 12 20 0V V a at t 2 24 40 0V V L Lo os ss s 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 188 High 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 22468 24 2 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 High Speed Fuses British BS 88 — 240V: 6-900A LMT 160-450A: 240V LMMT 400-900A: 240V Time-Current Curve Time-Current Curve 4 10 4 6 10 4 6 4 2 2 3 10 3 10 6 6 4 4 2 160LMT 2 2 10 400LMMT 200LMT 2 10 500LMMT 6 250LMT 6 4 630LMMT 315LMT 4 710LMMT 355LMT 2 800LMMT 400LMT 2 1 900LMMT 10 450LMT 1 10 6 6 4 4 2 2 0 10 0 10 6 6 4 4 2 2 –1 10 –1 10 6 6 4 4 2 2 –2 10 –2 10 6 4 6 4 2 2 –3 10 –3 10 6 4 6 4 2 2 –4 10 –4 22468 22468 2 3 4 10 10 10 10 22468 22468 2 3 4 10 10 10 Prospective Current In Amps RMS Prospective Current In Amps RMS Data Sheet: 35785294 Data Sheet: 35785295 Peak Let-Through Curve 2 5 10 900LMMT 800LMMT 6 710LMMT 4 630LMMT 450LMT 400 & 500LMMT 2 355LMT 315LMT 4 250LMT 10 180LET 6 200LMT 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 190 Virtual Pre-Arcing Time In Seconds Peak Let-Through Current Virtual Pre-Arcing Time In Seconds High Speed Fuses High Speed Fuses British BS 88 — 690V: 6-710A Arc Voltage CT, ET, FE, EET, FEE, FM, FMM, MT, MMT U L 1500 This curve gives the Specifications 1) peak arc voltage, U , L Description: BS 88 style which may appear stud-mount fuses. 1000 across the fuse during its 2) Dimensions: See dimensions operation as a function illustrations. of the applied working 500 Ratings: voltage, E , (rms) at a g Volts: — 690Vac/500Vdc power factor of 15%. E g Amps: — 6-710A Power Losses 200 400 600 660 IR: — 200kA RMS Sym. 1) CT Watts loss at rated 2) ET, FE, EET, FEE, FM, FMM Agency Information: CE, Designed and tested to: BS 88 current is given in the 1.0 Part 4, IEC 269 Part 4, UL Recognized. MT and MMT — Kp electrical characteristics. 0.8 350Vdc (IEC) rating. Consult Cooper Bussmann for UL The curve allows the 0.6 Recognition status. 0.5 calculation of the power 0.4 losses at load currents Electrical Characteristics lower than the rated 0.3 2 Total Clearing I t current. The correction 0.2 1.6 2 factor, K , is given as a The total clearing I t at rated K p 1.4 function of the RMS load voltage and at power factor current, Ib, in % of the I of 15% are given in the 1.2 b 0.1 rated current. 30 40 50 60 80 90 100% electrical characteristics. For 70 1.0 other voltages, the clearing 0.8 Features and Benefits 2 I t is found by multiplying by 0.6 • Excellent cycling capability correction factor, K, given as • Excellent DC performance 0.4 a function of applied working 2 1) • Low arc voltage and low energy let-through (I t) 2) voltage, E , (rms). 0.2 g • Low watts loss E g 200 300 400 500 600 690 Typical Applications 1) CT, ET, EET, FE, FEE, MT, MMT • DC common bus 2) FM, FMM • DC drives • Power converters/rectifiers • Reduced voltage starters Dimensions (mm) Fig. 2: ET, FE Fig. 3: EET, FEE Fig. 4: FM, MT Fig. 5: FMM, MMT Fig. 1: CT 8.7 7.1 25.4 25.4 4 5.5 50 A 113 46 70 94 48 63.5 77 50 A 113 54.8 64.3 74.6 14 11.9 9.7 13.5 10.3 31.8 12.7 10.3 17.1 37 6.4 83 19 8.7 8.7 41 19.1 38.1 38 1mm = 0.0394” / 1” = 25.4mm Figs. 4 & 5 “A” Dimensions Type “A” FM 80-85mm FMM 80-85mm MT 85mm MMT 85mm Data Sheet: 720024 For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa 191 High Speed Fuses British BS 88 — 690V: 6-710A Catalog Numbers CT 6-20, ET 25-80A: 690V E Elle ec ct tr riic ca all C Ch ha ar ra ac ct te er riis st tiic cs s 2 2 2 2 R Ra at te ed d II t t ( (A A S Se ec c) ) Time-Current Curve C Ca at ta allo og g C Cu ur rr re en nt t C Clle ea ar riin ng g C Clle ea ar riin ng g W Wa at tt ts s N Nu um mb be er rs s T Ty yp pe e R RM MS S- -A Am mp ps s P Pr re e- -a ar rc c a at t 4 41 15 5V V a at t 6 66 60 0V V L Lo os ss s 4 10 6CT 6 1.8 8.5 12 2 6 4 10CT 10 7 30 48 3 12CT CT 12 10 40 65 3 2 16CT 16 16 66 110 7 3 10 20CT 20 32 150 220 7 6 25ET 25 25 150 250 7 4 25ET 32ET 32 32 190 350 11 2 32ET 35ET 35 52 310 500 11 35ET 2 10 40ET 40ET 40 103 600 900 9 6 45ET ET 45ET 45 103 680 1100 11 4 56ET 56ET 56 135 950 1500 14 63ET 2 80ET 63ET 63 171 1200 2000 16 1 10 80ET 80 360 2500 4000 18 6CT 6 10CT 35FE 35 33 130 200 9 4 12CT 40FE 40 52 180 300 9 2 16CT 45FE 45 76 270 450 11 20CT 0 10 50FE 50 103 380 600 11 6 63FE FE 63 135 480 750 12 4 71FE 71 210 600 950 17 2 80FE 80 250 900 1500 20 –1 10 90FE 90 360 1300 2100 20 6 100FE 100 470 1800 2800 23 4 90EET 90 490 3000 4500 19 2 110EET 110 600 4000 6500 27 EET –2 10 140EET 140 1050 7000 12000 35 6 160EET 160 1500 10000 17000 39 4 100FEE 100 400 1600 2400 24 2 120FEE 120 540 1900 3100 32 –3 140FEE 140 850 2500 3800 36 10 FEE 160FEE 160 1000 3700 5700 46 6 4 180FEE 180 1400 5300 8400 46 2 200FEE 200 1900 7100 11400 52 180FM 180 1400 7500 13500 40 –4 10 24 68 22468 22468 1 2 3 10 10 10 200FM 200 2600 10500 18500 40 Prospective Current In Amps RMS 225FM 225 3700 14500 26500 44 250FM FM 250 5200 20500 37500 48 280FM 280 7000 30500 55000 48 315FM 315 10000 40000 77000 55 350FM 350 15000 60000 105000 55 Peak Let-Through Curve 400FMM 400 10000 40000 72500 85 450FMM 450 15000 60000 105000 90 6 500FMM 500 20000 82000 150000 100 710MMT FMM 4 630MMT 550FMM 550 30000 120000 215000 100 560MMT 500MMT 630FMM 630 45000 180000 310000 100 2 450MMT 315MT 355MT 400MMT 700FMM 700 60000 245000 420000 120 280MT 355MMT 5 10 250MT 315MMT 160MT 160 2400 15000 25000 26 280MMT 200MT 6 180MT 180 3800 25000 38000 26 180MT 225MMT 160MT 200MMT 4 200MT 200 6000 40000 58000 27 180MMT 250MT MT 250 11500 80000 110000 32 2 280MT 280 16500 100000 150000 35 4 10 315MT 315 19000 125000 180000 42 355MT 355 22000 160000 200000 51 6 180MMT 180 1650 12000 18000 42 4 200MMT 200 2200 16000 23000 42 2 225MMT 225 3700 26000 40000 42 3 280MMT 280 6600 47000 70000 47 10 315MMT 315 8600 62000 91000 51 6 160EET 355MMT 355 13500 97000 140000 54 4 140EET MMT 110EET 400MMT 400 21000 150000 220000 60 80ET 90EET 2 63ET 450MMT 450 30000 220000 320000 57 56ET 45ET 20CT 500MMT 500 42000 300000 450000 64 2 40ET 10 16CT 35ET 12CT 560MMT 560 60000 430000 640000 64 32ET 10CT 6 25ET 6CT 630MMT 630 68500 500000 720000 86 4 710MMT 710 78000 600000 850000 105 2 • Watts loss provided at rated current. • Note: FC, 8ET, 12ET, 15ET, 20ET, 65EET and 75EET are available for replacement 1 10 purposes on existing equipment. 2 462 46 2 462 46 2 1 2 3 4 5 10 10 10 10 10 • See accessories on page 195. Prospective Short-Circuit Current Symmetrical RMS Data Sheet: 35785312 For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa 192 Virtual Pre-Arcing Time In Seconds Peak Let-Through Current High Speed Fuses High Speed Fuses British BS 88 — 690V: 6-710A EET 90-160A, MT 160-355A: 690V MMT 180-710A: 690V Time-Current Curve Time-Current Curve 4 4 10 10 6 6 4 4 2 2 400MMT 3 3 10 10 450MMT 160MT 6 500MMT 6 4 180MT 560MMT 4 200MT 630MMT 2 250MT 2 710MMT 280MT 2 10 2 315MT 10 6 355MT 6 4 4 2 180MMT 2 1 10 200MMT 1 6 10 90EET 225MMT 4 110EET 280MMT 6 140EET 315MMT 4 2 160EET 355MMT 0 2 10 6 0 10 4 6 2 4 –1 10 2 6 –1 4 10 6 2 4 –2 10 2 6 4 –2 10 2 6 –3 4 10 6 2 4 –3 10 2 6 –4 10 4 24 68 22468 22468 2 3 4 10 10 10 2 Prospective Current In Amps RMS –4 10 22468 22468 2 3 4 10 10 10 Data Sheet: 35785313 Prospective Current In Amps RMS Data Sheet: 35785311 Peak Let-Through Curve 6 710MMT 4 630MMT 560MMT 500MMT 2 450MMT 315MT 355MT 400MMT 280MT 355MMT 5 10 250MT 315MMT 280MMT 200MT 6 180MT 225MMT 160MT 200MMT 4 180MMT 2 4 10 6 4 2 3 10 6 160EET 4 140EET 110EET 90EET 80ET 2 63ET 56ET 45ET 20CT 2 10 40ET 16CT 35ET 12CT 32ET 10CT 6 25ET 6CT 4 2 1 10 2 462 46 2 462 46 2 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 193 Virtual Pre-Arcing Time In Seconds Peak Let-Through Current Virtual Pre-Arcing Time In Seconds High Speed Fuses British BS 88 — 690V: 6-710A FE 35-100A & FM 180-350A: 690V FEE 100-200A & FMM 400-700A: 690V Time-Current Curve Time-Current Curve 4 10 4 6 10 4 6 4 2 2 3 10 6 3 10 4 6 2 4 180FM 2 10 200FM 2 6 400FMM 220FM 2 10 4 250FM 450FMM 280FM 6 500FMM 2 315FM 4 550FMM 350FM 1 630FMM 10 2 700FMM 6 4 1 10 100FEE 6 2 35FE 120FEE 4 0 40FE 140FEE 10 45FE 160FEE 6 2 50FE 4 180FEE 0 63FE 10 200FEE 2 71FE 6 80FE –1 4 10 90FE 6 100FE 2 4 –1 10 2 6 –2 10 4 6 4 2 –2 2 10 –3 6 10 4 6 4 2 2 –3 10 –4 10 6 24 68 22468 22468 2 3 4 10 10 10 4 Prospective Current In Amps RMS 2 –4 10 22468 22468 2 3 4 10 10 10 Prospective Current In Amps RMS Peak Let-Through Curve Peak Let-Through Curve 5 10 700FMM 8 630FMM 6 6 550FMM 4 500FMM 4 450FMM 2 400FMM 350FM 315FM 4 280FM 10 250FM 2 225FM 6 200FM 180FM 4 4 10 2 8 3 10 6 6 4 4 2 100FE 90FE 2 2 10 80FE 71FE 63FE 6 50FE 45FE 3 4 10 40FE 35FE 200FEE 8 2 180FEE 6 160FEE 1 10 140FEE 246 2 46 246 2 46 2 1 2 3 4 5 10 10 10 10 10 4 120FEE 100FEE Prospective Short-Circuit Current Symmetrical RMS 2 246 246 246 2 2 3 4 5 10 10 10 10 Prospective Short-Circuit Current Symmetrical RMS Data Sheet: 35785314 Data Sheet: 35785292 For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa 194 Virtual Pre-Arcing Time In Seconds Peak Let-Through Current Virtual Pre-Arcing Time In Seconds Peak Let-Through Current High Speed Fuses High Speed Fuses British BS 88 Fuse Accessories C CL L1 1 P Pa an ne ell M Mo ou un nt t C Clliip ps s IIn nd diic ca at to or r S Sy ys st te em m Trip Indicator CL1 Panel mount fuse clips T Tr riip p- -IIn nd diic ca at to or rs s are available for mounting a Trip-indicators are available for use in parallel with the trip-indicator when mounting main fuse. They can either be attached to the associated directly on the fuse is fuse or mounted separately in panel mounted fuse clips, impractical. Order part reference CL1. A push-on adapter and microswitch number CL1. attachment is available for use with the trip indicator to give the facility of remote indication, reference MAI. Fuse ratings of 20A and below cannot usually T Tr riip p- -IIn nd diic ca at to or r accommodate a trip-indicator. D Diim me en ns siio on ns s - - m mm m When a trip-indicator is to be attached to the main fuse an B C6 21 E0.8 F 6.35 accessory pack comprising a pair of mounting clips and an appropriate trip indicator would be required. The clips are snapped onto the fuse end caps and the indicator is pressed into clips as shown. A D 6.8 E Elle ec ct tr riic ca all S Sp pe ec ciif fiic ca at tiio on ns s Ref. Dim. “A” (mm) RMS Volts Type TI500 TI700 TI250 37.6 250 TI500 47.5 500 Maximum RMS Voltage 500 700 TI600 55.7 600 Maximum Peak Voltage 700 1000 TI700 61.8 700 Maximum DC Voltage 130 350 TI1100 98.4 1100 Cold Resistance (ohms) 0.3 0.45 TI1500 120.6 1500 Maximum permissible steady-state current 1.5A 1.5A TI2000 147.5 2000 Interrupting Capacity (RMS Symm.) 100,000 100,000 TI2500 198.3 2500 2 Pre-Arcing It2323 C CL L1 1 P Pa an ne ell M Mo ou un nt t C Clliip p 8.7 6.0 F Fu us se e IIn nd diic ca at to or r K Kiit ts s D Diim me en ns siio on ns s - - m mm m 14 RMS For use Kit. Ref. Details Volts with Fuse Ref. EC-250 Fuse Mount 250 LET MC250 Indicator Kits 250 LMT & LMMT 50.8 EC-600 (Includes one 660 FE, FEE & ET MC600 indicator 660 FM & FMM MC700 and two clips) 700 MT & MMT B T Te er rm miin na all A Ar rr ra an ng ge em me en nt t M Miic cr ro os sw wiit tc ch h A Ad da ap pt te er r – – M MA AII NO We offer a microswitch, complete with adapter for NC securing the indicator. The microswitch is provided with double pole, single throw contacts, having both a normally NC NO open and a normally closed position. A special material has been employed in the construction of the adapter to D Diim me en ns siio on ns s iin n m mm m provide reliable operation in the range of temperatures associated with standard operating conditions and during fuse operation. M Miic cr ro os sw wiit tc ch h a an nd d A Ad da ap pt te er r T Ty yp pe e M MA AII Current Rating: AC 50/60Hz resistive load @ 250V RMS 4A AC 50/60Hz resistive load @ 127V RMS 6A DC, resistive load @ 110Vdc 0.7A DC DC, resistive load @ 30Vdc 2A DC Maximum Working Voltage: Contact-to-contact (RMS) 1000V Contact-to-contact (RMS) 1500V Maximum DC Volts: 110V DC For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa 195