BRITISH STYLE SEMICONDUCTOR PROTECTION FUSES

The Edison British Style semiconductor protection fuses include a 660VAC line utilizing new filler technology. These new fuses have greatly reduced peak let-through current and energy under fault conditions and hence extend fuse protection capability. They can be recognized by the letter F in their catalog number. Application and technical data for these 660VAC F fuses and the original line of 240VAC British T type fuses are presented on the following pages. F Range This is a superior design of fuses in the same physical package as the T range. Equivalent Ratings This table shows the suggested equivalent ratings to replace a T with an F. Because of the new design technology it has been possible to obtain the equivalent energy let-through I 2 t with a higher amp rated fuse hence reducing the possibility of premature operation. This table gives a range of suggested acceptable new F type to replace the earlier T type. To upgrade your protection to the new F series select a fuse rating within the range shown that suits your circuit inrush requirements. You will still have the same or better protection of your semiconductor devices. It should be remembered that to protect devices we must consider the energy let-through of the selected fuse. The label amp rating will relate to the full load current and the circuit inrush amps. The suggested replacements are based on: a. Similar surge withstand to normal circuit overloads. b. Lower total I 2 t let-through. This gives enhanced reliability due to the use of a higher current rated fuse which avoids nuisance operation and still gives improved short-circuit protection. Replacement Table T to F (660V) New F Range Earlier Lowest Highest T Range Rating Rating 6CT 6FC 6FC CT FC FC 2CT 2FC 2FC 6CT 6FC 6FC 20CT 20FC 20FC 25ET 32ET 35FE 35FE 35ET 35FE 40FE 40ET 40FE 45FE 45ET 45FE 50FE 56ET 63FE 63FE 63ET 63FE 7FE 80FE 90FE 80ET 80FE 0FE 65EET 75EET 90EET 0FEE EET 20FEE 40FEE 40EET 40FEE 60FEE 80FEE 60EET 60FEE FEE 80FM 60MT FM FM 80MT 225FM 225FM MT 250FM 250FM 280FM 280FM 250MT 35FM 35FM 280MT 350FM 350FM 35MT 350FM 350FM 355MT 350MT 350FM 80MMT 80FM 80FM MMT FM FM 225MMT 225FM 225FM 280MMT 280FM 280FM 35MMT 35FM 35FM 355MMT 350FM 350FM 400FMM 450FMM 400MMT 500FMM 500FMM 450MMT 550FMM 550FMM 500MMT 6FMM 6FMM 560MMT 700FMM 700FMM 6MMT 700FMM 700FMM 7MMT 700FMM 700FMM 84

660 VOLT (AC) RANGE BRITISH STYLE I 2 t (A 2 SEC) Carton Part Clearing Clearing Watts D.C. Carton Weight Type Outline Number Pre-arc At 45V At 660V Loss Volts Qty. (Kg) 6FC.5 6 8 3 20 060 FC 6 8 3 20 060 FC 2FC 9 26 45 3 660 20 060 2.53" 64.3mm 6FC 3 44 65 6 20 060 20FC 0 60 6 20 060 ET 25ET 25 50 250 7 450 0.420 32ET 32 90 350 0.420 35FE 33 9 0.420 40FE 52 80 0 9 0.420 45FE 76 270 450 0.420 50FE 3 380 600 0.420 2.50" FE 63.5mm 63FE 35 480 750 2 450 0.420 7FE 2 600 950 7 0.420 80FE 250 900 500 20 0.420 90FE 360 0 20 20 0.420 0FE 470 800 2800 23 0.420 65EET 2 0 00 20 5 0.450 EET 75EET 420 2600 4400 20 450 5 0.450 90EET 490 00 4500 9 5 0.450 0FEE 400 600 2400 24 5 0.450 20FEE 540 900 32 5 0.450 FEE 2.76" 40FEE 850 2500 3800 36 450 5 0.450 70.0mm 60FEE 00 3700 5700 46 5 0.450 80FEE 400 50 8400 46 5 0.450 FEE 900 70 400 52 5 0.450 80FM 400 7500 3500 40 0.240 FM 2600 500 8500 40 0.240 225FM 3700 4500 26500 44 0.240 FM 250FM 5 20500 37500 48 450 280FM 7000 500 55000 48 0.240 35"-3.35" 80-85mm 35FM 000 40000 77000 55 0.240 350FM 5000 60000 5000 55 0.240 400FMM 000 40000 72500 85 0.450 450FMM 5000 60000 5000 90 0.450 FMM 500FMM 00 80 5000 0 0.450 550FMM 000 00 25000 0 450 0.450 6FMM 45000 80000 00 0 0.450 700FMM 60000 245000 400 20 0.450 35"-3.35" 80-85mm Interrupting rating ka RMS Symmetrical. Watts loss provided at rated current. These fuses meet the requirements of BS 88 Part 4 and IEC 269-4 Consult Edison for UL Recognition information 85

240 VOLT (AC) RANGE BRITISH STYLE I 2 t (A 2 SEC) Carton Part Clearing Clearing Watts D.C. Carton Weight Type Outline Number Pre-arc At 20V At 240V Loss Volts Qty. (Kg) 6LCT 2 6 9.0 20 0 LCT 3.8 2 22 2.5 20 0 LCT 2LCT 7 22 32 2.5 20 0.50" 38.0mm 6LCT 20 50 0 2.5 20 0 20LCT 25 80 60 4.0 20 0 7LET.7 7.5 0.3 LET 3.8 23 35.8 0.3 2LET 7 42 58 2 0.3 6LET 5 70 40 2.5 0.3 25LET 8 20 250 4.0 0.3 32LET 32 450 5.0 0.3 LET 35LET 50 320 600 5.0 40 0.3.65" 4.8mm 50LET 0 500 400 7.0 0.3 63LET 80 0 2 9.0 0.3 80LET 0 900 3800.0 0.3 0LET 600 3800 7500.0 0.3 25LET 600 3800 7500.0 0.3 60LET 0 7000 8000 20.0 0.3 80LET 600 0 29000 2.0 0.3 60LMT 0 7000 6000 7.0 080 LMT 500 000 00 28.0 080 250LMT 3 00 40000 28.0 080 LMT 35LMT 6000 35000 75000 35.0 60 080 355LMT 8000 50000 0000 35.0 080 2.32" 59.0mm 400LMT 4000 70000 60000 40.0 080 450LMT 8000 0000 200 42.0 080 400LMMT 6000 35000 80000 60.0 0.370 400LMMT 4000 80000 70000 64.0 0.370 400LMMT 24000 50000 0000 75.0 60 0.370 LMMT 400LMMT 000 460000 77.0 0.370 400LMMT 50 0000 600000 82.0 0.370 400LMMT 75000 400000 800000 97.0 0.370 2.32" 59.0mm Interrupting rating ka RMS Symmetrical. Watts loss provided at rated current. All fuses above have been tested to 38VAC. These fuses meet the requirements of BS 88 Part 4 and IEC 269-4 UL Recognition on LET and LMT. Others pending Consult Edison. 86

DIMENSIONS in Millimeters Type A B C D E F G H FC 74.6 64.3 54.8 8.7 8.7 6.4 4 5.5 LCT 47 38 28 8.4 8.7 6.4 4 5.5 FE & ET 77 63.5 48 7.7 9 2.7 7 9.7 LET 56 4.8 26.2 7.7 9 2.7 7 9.7 FEE & EET 94 70 46 37 9 3.8 8.7.9 FM 3 80-85 50 38 4.5 25.4.3 4 LMT 84 59 3 38 4 25.4.3 3.5 FMM 3 80-85 50 83 38 25.4.3 4 LMMT 84 59 3 83 38 25.4.3 3.5 FC & LCT FE, ET & LET FEE & EET FM & LMT FMM & LMMT 87

0 20 40 60 80 400 500 450 550 6 700 660V Time-Current Curves FEE (0-A) FMM (400-700A) TIME IN SECONDS.0.004 0 00,000 6 2 6 20 50 7 90 35 40 45 63 80 0 80 250 225 280 35 350 660V Time-Current Curves FC (6-20A) FE (35-0A) FM (80-350A) 0 04 88 0 00 60000

60 2 35 355 400 450 240V Time-Current Curves LMT (60-450A) TIME IN SECONDS.0.004 00 4000 5 2 5 20 25 32 35 50 63 80 0 25 80 60 7 400 500 6 800 900 LCT (6-20A) LET (25-80A) LMMT (400-900A) 240V Time-Current Curves TIME IN SECONDS.0.004 0 00,000 89

INDICATORS AND 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 CL. 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 20A 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 500 700 Maximum Peak Voltage 700 00 Maximum DC Voltage 350 Cold Resistance (ohms) 0.3 0.45 Maximum permissible steady-state current.5a.5a Interrupting Capacity (RMS Symm.) 0,000 0,000 Pre-Arcing I 2 t (A 2 S) 23 23 Total I 2 t (max volts) (A 2 S) 46 46 Fuse Indicator Kits RMS For use Kit. Ref. Details Volts with Fuse Ref. EC-250 Fuse Mount 250 LET MC250 Indicator Kits 250 LMT & LMMT EC-600 (Inc. one indicator 660 FE, FEE, ET, & EET MC600 and two clips) 660 FM & FMM MC700 700 MT & MMT C6 2 B E0.8 Dimensions in mm A Trip-Indicator Data Ref. Dim. A (mm) RMS Volts TI250 37.6 250 TI500 47.5 500 TI600 55.7 600 TI700 6.8 700 TI0 98.4 0 TI500 20.6 500 TI0 47.5 0 TI2500 98.3 2500 D 6.8 F 6.35 Microswitch Adapter MAI Edison is offering 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 Current Rating: AC 50/60Hz resistive load @ 250V RMS AC 50/60Hz resistive load @ 27V RMS DC, resistive load @ V DC DC, resistive load @ V DC Maximum Working Voltage: Contact-to-contact (RMS) Contact-to-contact (RMS) Maximum DC Volts: 4A 6A 0.7A DC 2A DC 00V 500V V DC Terminal Arrangement NO NC NC NO Dimensions in mm 90