Medium Voltage Fuses
British Standard dimensioned IEC fuses for
motor circuit protection
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.
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)
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
Catalog Number Build-A-Code
kV
Basic Catalog Number
___
_____
Amps
___
80
For product Data Sheets, visit www.cooperbussmann.com/products/datasheet.asp
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