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1 British BS 88 Introduction British BS 88 Contents Fuse Volts Amp Range Page Accessories Indicator System & Fuse Bases 195 British BS 88 Fuse Ranges Amps Vac Vdc General Information Designed and tested to: BS 88: Part IEC 9: Part UL Recognized Cooper Bussmann offers the industry s widest range of British style semiconductor fuses and accessories. Cooper Bussmann British style products use innovative arc quenching techniques and high grade materials to provide: Minimal energy let-through (I t) Excellent DC performance Good surge withstand profile British style fuses are typically found in equipment 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 0V or less to take advantage of their size, performance and cost benefits. Voltage Rating All Cooper Bussmann British style fuses are tested to IEC 9: Part. 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. This document provided by Barr-Thorp Electric Co., Inc
2 British BS 88 0V: -900A LCT, LET, LMT, LMMT Specifications Description: BS 88 style stud-mount fuses. Dimensions: See dimensions illustrations. Ratings: Volts: 0Vac/150Vdc Amps: -900A IR: 00kA RMS Sym. Agency Information: CE, Designed and tested to: BS 88 Part, IEC 9 Part, UL Recognized. All fuses above have been tested at 318Vac. Consult Cooper Bussmann for specific UL Recognition status. Electrical Characteristics 1. Total Clearing I t K 1. The total clearing I t at rated 1. voltage and at power factor 1.0 of 15% are given in the electrical characteristics. For 0.8 other voltages, the clearing 0. 1) I t is found by multiplying by 0. correction factor, K, given as 0. a function of applied working ) E g voltage, E g, (rms) Dimensions (mm) Fig. 1: LCT mm = / 1 = 5.mm Fig. : LET Fig. 3: LMT ) LCT ) LET, LMT, LMMT Fig. : LMMT Arc Voltage 750 This curve gives the peak arc voltage, U L, which may appear across the 500 fuse during its operation as a function of the applied working voltage, 50 E g, (rms) at a power factor of 15%. Power Losses ) LCT Watts loss at rated current ) LET, LMT, LMMT is given in the electrical 1.0 Kp characteristics. The curve 0.8 allows the calculation of the power losses at load currents lower than the rated current. The correction factor, K p, is given as a function of the RMS load current, I b, in % of the rated current. 0.1 I b Catalog Numbers Electrical Characteristics % Rated I t (A Sec) Catalog Current Clearing Clearing Watts Numbers Type RMS-Amps Pre-arc at 10V at 0V Loss LCT LCT LCT LCT LCT LCT LET LET LET LET LET LET LET LET LET LET LETa LMT LMT LMT LMT LMT LMT LMT LMT LMMT LMMT LMMT LMMT LMMT LMMT LMMT Watts loss provided at rated current. Note: 7LET, 10LET, 1LET and 1LET are available for replacement purposes on existing equipment. See accessories on page 195. U L 1) ) E g Data Sheet: Indicator (Optional) Features and Benefits Excellent cycling capability Excellent DC performance Low arc voltage and low energy let-through (I t) This document provided by Barr-Thorp Electric Co., Inc Typical Applications DC common bus AC and DC drives Power converters/rectifiers Reduced voltage starters
3 British BS 88 0V: -900A LCT -0A: 0V LET 5-180A: 0V LCT 10LCT 1LCT 1LCT 0LCT 10 5LET 3LET 35LET 50LET 3LET 80LET 100LET 15LET 10LET 180LETa Data Sheet: Data Sheet: LMMT 800LMMT 710LMMT 30LMMT 50LMT 00 & 500LMMT 355LMT 315LMT 50LMT 180LET 00LMT 10LET & LMT 15 & 100LET 80LET 10 SYMMETRICAL FAULT FULLY ASYMMETRICAL FAULT 10 0LCT 1LCT 1LCT 10LCT LCT 3LET 50LET 35LET 3LET 5LET 10 This document provided by Barr-Thorp Electric Co., Inc
4 British BS 88 0V: -900A LMT 10-50A: 0V LMT 00LMT 50LMT 315LMT 355LMT 00LMT 50LMT LMMT A: 0V LMMT 500LMMT 30LMMT 710LMMT 800LMMT 900LMMT Data Sheet: Data Sheet: LMMT 800LMMT 710LMMT 30LMMT 50LMT 00 & 500LMMT 355LMT 315LMT 50LMT 180LET 00LMT 10LET & LMT 15 & 100LET 80LET 10 SYMMETRICAL FAULT FULLY ASYMMETRICAL FAULT 10 0LCT 1LCT 1LCT 10LCT LCT 3LET 50LET 35LET 3LET 5LET This document provided by Barr-Thorp Electric Co., Inc
5 British BS 88 90V: -710A CT, ET, FE, EET, FEE, FM, FMM, MT, MMT Specifications Description: BS 88 style stud-mount fuses. Dimensions: See dimensions illustrations. Ratings: Volts: 90Vac/500Vdc Amps: -710A IR: 00kA RMS Sym. Agency Information: CE, Designed and tested to: BS 88 Part, IEC 9 Part, UL Recognized. MT and MMT 350Vdc (IEC) rating. Consult Cooper Bussmann for UL Recognition status. Electrical Characteristics Total Clearing I t The total clearing I t at rated voltage and at power factor of 15% are given in the electrical characteristics. For other voltages, the clearing I t is found by multiplying by correction factor, K, given as a function of applied working voltage, E g, (rms) K 0. 1) ) 0. E g ) CT, ET, EET, FE, FEE, MT, MMT ) FM, FMM Arc Voltage This curve gives the peak arc voltage, U L, which may appear across the fuse during its operation as a function of the applied working voltage, E g, (rms) at a power factor of 15%. Power Losses Watts loss at rated current is given in the electrical characteristics. The curve allows the calculation of the power losses at load currents lower than the rated current. The correction factor, K p, is given as a function of the RMS load current, Ib, in % of the rated current. Features and Benefits Excellent cycling capability Excellent DC performance Low arc voltage and low energy let-through (I t) Low watts loss Typical Applications DC common bus DC drives Power converters/rectifiers Reduced voltage starters Kp U L E g ) CT ) ET, FE, EET, FEE, FM, FMM I 0.1 b % 1) ) Dimensions (mm) Fig. 1: CT 5.5 Fig. : ET, FE 7.1 Fig. 3: EET, FEE Fig. : FM, MT Fig. 5: FMM, MMT A A mm = / 1 = 5.mm Data Sheet: Figs. & 5 A Dimensions Type A FM 80-85mm FMM 80-85mm MT 85mm MMT 85mm This document provided by Barr-Thorp Electric Co., Inc
6 British BS 88 90V: -710A Catalog Numbers Electrical Characteristics Rated I t (A Sec) Catalog Current Clearing Clearing Watts Numbers Type RMS-Amps Pre-arc at 15V at 0V Loss CT CT CT CT CT CT ET ET ET ET ET 5ET ET ET ET FE FE FE FE FE FE FE FE FE FE EET EET EET 10EET EET FEE FEE FEE FEE 10FEE FEE FEE FM FM FM FM FM FM FM FM FMM FMM FMM FMM 550FMM FMM FMM MT MT MT MT MT MT MT MT MMT MMT MMT MMT MMT MMT MMT 00MMT MMT MMT MMT MMT MMT Watts loss provided at rated current. Note: FC, 8ET, 1ET, 15ET, 0ET, 5EET and 75EET are available for replacement purposes on existing equipment. See accessories on page 195. CT -0, ET 5-80A: 90V CT 10CT 1CT 1CT 0CT 5ET 3ET 35ET 0ET 5ET 5ET 3ET 80ET MMT 30MMT 50MMT 500MMT 50MMT 315MT 355MT 00MMT 80MT 355MMT 50MT 315MMT 80MMT 00MT 180MT 5MMT 10MT 00MMT 180MMT 0CT 1CT 1CT 10CT CT 80ET 3ET 5ET 5ET 0ET 35ET 3ET 5ET EET 10EET 110EET 90EET Data Sheet: This document provided by Barr-Thorp Electric Co., Inc
7 British BS 88 90V: -710A EET 90-10A, MT A: 90V MMT A: 90V EET 110EET 10EET 10EET Data Sheet: MT 180MT 00MT 50MT 80MT 315MT 355MT MMT 00MMT 5MMT 80MMT 315MMT 355MMT Data Sheet: MMT 50MMT 500MMT 50MMT 30MMT 710MMT 710MMT 30MMT 50MMT 500MMT 50MMT 315MT 355MT 00MMT 80MT 355MMT 50MT 315MMT 80MMT 00MT 180MT 5MMT 10MT 00MMT 180MMT CT 1CT 1CT 10CT CT 80ET 3ET 5ET 5ET 0ET 35ET 3ET 5ET 10EET 10EET 110EET 90EET This document provided by Barr-Thorp Electric Co., Inc
8 British BS 88 90V: -710A FE A & FM A: 90V FEE A & FMM A: 90V FE 0FE 5FE 50FE 3FE 71FE 80FE 90FE 100FE FM 00FM 0FM 50FM 80FM 315FM 350FM FEE 10FEE 10FEE 10FEE 180FEE 00FEE 10 00FMM 50FMM 500FMM 550FMM 30FMM 700FMM FMM 30FMM 550FMM 500FMM FM 315FM 80FM 50FM 5FM 00FM 180FM 50FMM 00FMM FE 90FE 80FE 71FE 3FE 50FE 5FE 0FE 35FE FEE 180FEE 10FEE 10FEE 10FEE 100FEE Data Sheet: Data Sheet: This document provided by Barr-Thorp Electric Co., Inc
9 British BS 88 Fuse Accessories Indicator System Trip-Indicators Trip-indicators are available for use in parallel with the main fuse. They can either be attached to the associated fuse or mounted separately in panel mounted fuse clips, reference CL1. A push-on adapter and microswitch attachment is available for use with the trip indicator to give the facility of remote indication, reference MAI. Fuse ratings of 0A and below cannot usually accommodate a trip-indicator. When a trip-indicator is to be attached to the main fuse an 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. Electrical Specifications Type TI500 TI700 Maximum RMS Voltage Maximum Peak Voltage Maximum DC Voltage Cold Resistance (ohms) Maximum permissible steady-state current 1.5A 1.5A Interrupting Capacity (RMS Symm.) 100, ,000 Pre-Arcing I t 3 3 Fuse Indicator Kits RMS For use Kit. Ref. Details Volts with Fuse Ref. EC-50 Fuse Mount 50 LET MC50 Indicator Kits 50 LMT & LMMT EC-00 (Includes one 0 FE, FEE & ET MC00 indicator 0 FM & FMM MC700 and two clips) 700 MT & MMT CL1 Panel Mount Clips CL1 Panel mount fuse clips are available for mounting a trip-indicator when mounting directly on the fuse is impractical. Order part number CL1. Trip-Indicator Dimensions - mm C 1 B E0.8 A Ref. Dim. A (mm) RMS Volts TI TI TI TI TI TI TI TI CL1 Panel Mount Clip Dimensions - mm Trip Indicator D.8 F B.35 Microswitch Adapter MAI We offer a microswitch, complete with adapter for securing the indicator. The microswitch is provided with double pole, single throw contacts, having both a normally open and a normally closed position. A special material has been employed in the construction of the adapter to provide reliable operation in the range of temperatures associated with standard operating conditions and during fuse operation. Microswitch and Adapter Type MAI Terminal Arrangement Dimensions in mm NO NC NC NO Current Rating: AC 50/0Hz resistive 50V RMS AC 50/0Hz resistive 17V RMS DC, resistive 110Vdc DC, resistive 30Vdc Maximum Working Voltage: Contact-to-contact (RMS) Contact-to-contact (RMS) Maximum DC Volts: A A 0.7A DC A DC 1000V 1500V 110V DC This document provided by Barr-Thorp Electric Co., Inc
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