Medium Voltage Fuses British Standard dimensioned IEC fuses for motor circuit protection The Cooper Bussmann(R) 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(R) 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(R) 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. Table of Ratings Basic Cat. Number WJON6 WDOH6 WFOH6 WDLSJ WFLSJ WDFHO WFFHO WKFHO VFNHA VKNHA WFNHO WKNHO WFMSJ WKMSJ Volts 3.6kV 3.6kV 3.6kV 3.6kV 3.6kV 3.6kV 3.6kV 3.6kV 5.5kV 5.5kV 7.2kV 7.2kV 7.2kV 7.2kV Breaking Capacity 50kA 50kA 50kA 50kA 50kA 50kA 50kA 50kA 60kA 60kA 40kA 40kA 40kA 40kA Dimensions - in (mm) Amp Ratings Length Diameter 5, 6.3, 10, 16, 20, 25, 31.5, 40, 50 7.56 (192) 1.4 (35.6) 50, 63, 80, 100, 125 7.56 (192) 2 (50.8) 160, 200 11.5 (292.1) 3 (76.2) 50, 63, 80, 100, 125 11.5 (292.1) 2 (50.8) 160, 200 11.5 (292.1) 3 (76.2) 50, 63, 80, 100, 125 10 (254) 2 (51mm) 160, 200 10 (254) 3 (76.2) 250, 315, 355, 400 10 (254) 3 (76.2) 2R-6R 15.86 (402.8) 3 (76.2) 9R-24R 15.86 (402.8) 3 (76.2) 25, 31.5, 40, 50, 63, 80, 100, 125, 160 15.86 (402.8) 3 (76.2) 200, 224, 250, 315 15.86 (402.8) 3 (76.2) 25, 31.5, 40, 50, 63, 80, 125, 160 17.40 (442) 3 (76.2) 200, 224, 250, 315, 355 17.40 (442) 3 (76.2) Catalog Number Build-A-Code kV Basic Catalog Number ___ 80 _____ Dimensional Standard BS 2692 (TA1) Interchangeable with GEC type K2 PA BS 2692 (TA1) or DIN 43625 BS 2692 (TA1) or DIN 43625 DIN 43625 DIN 43625 BS 2692 (TA2) BS 2692 (TA2) BS 2692 (TA2) N. American Practice N. American Practice BS 2692 (TA4) BS 2692 (TA4) DIN 43625 DIN 43625 Amps ___ For product Data Sheets, visit www.cooperbussmann.com/products/datasheet.asp