For product Data Sheets, visit www.cooperbussmann.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.
