for product data sheets, visit www .cooperb ussmann.com/products/datasheet.asp 80 medium voltage fuses table of ratings basic cat. breaking dimensions - in (mm) number volts capacity amp ratings length diameter dimensional standard wjon6 3.6kv 50ka 5, 6.3, 10, 16, 20, 25, 31.5, 40, 50 7.56 (192) 1.4 (35.6) bs 2692 (ta1) interchangeable with gec type k2 pa wdoh6 3.6kv 50ka 50, 63, 80, 100, 125 7.56 (192) 2 (50.8) bs 2692 (ta1) or din 43625 wfoh6 3.6kv 50ka 160, 200 11.5 (292.1) 3 (76.2) bs 2692 (ta1) or din 43625 wdlsj 3.6kv 50ka 50, 63, 80, 100, 125 11.5 (292.1) 2 (50.8) din 43625 wflsj 3.6kv 50ka 160, 200 11.5 (292.1) 3 (76.2) din 43625 wdfho 3.6kv 50ka 50, 63, 80, 100, 125 10 (254) 2 (51mm) bs 2692 (ta2) wffho 3.6kv 50ka 160, 200 10 (254) 3 (76.2) bs 2692 (ta2) wkfho 3.6kv 50ka 250, 315, 355, 400 10 (254) 3 (76.2) bs 2692 (ta2) vfnha 5.5kv 60ka 2r-6r 15.86 (402.8) 3 (76.2) n. american practice vknha 5.5kv 60ka 9r-24r 15.86 (402.8) 3 (76.2) n. american practice wfnho 7.2kv 40ka 25, 31.5, 40, 50, 63, 80, 100, 125, 160 15.86 (402.8) 3 (76.2) bs 2692 (ta4) wknho 7.2kv 40ka 200, 224, 250, 315 15.86 (402.8) 3 (76.2) bs 2692 (ta4) wfmsj 7.2kv 40ka 25, 31.5, 40, 50, 63, 80, 125, 160 17.40 (442) 3 (76.2) din 43625 wkmsj 7.2kv 40ka 200, 224, 250, 315, 355 17.40 (442) 3 (76.2) din 43625 british standard dimensioned iec fuses for motor circuit protection catalog number build-a-code kv basic catalog number amps _ _ _ _ _ _ _ _ _ _ _ the cooper bussmann? range of motor fuses are designed to meet the specific requirements necessary for motor protection. during the starting cycle of direct on-line motors, the fuse elements will reach a considerably higher temperature than during normal operation; (this is due to the high amount of current the motor will draw as it starts, typically, 6 times its normal load current value). this results in expansion and contraction of the fuse elements and could cause premature operation of the fuse. cooper bussmann ? motor fuses encompass an advanced design to minimize this effect. this therefore, negates the need to over specify the fuse rating due to high values of motor starting current. cooper bussmann ? motor fuses operate extremely quickly under heavy fault currents, resulting from the time / current characteristic. low power dissipation ensures low temperature rise, important in multi-tier starters for example. switching (arc), voltages are lower than permitted values, therefore, 5.5kv fuses are also suitable for 4.8kv and 2.4kv circuits.
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