UL/CSA Fuses
Current Limiting
High Voltage DIN Distribution Fuses
Circuit Protection
General Guide to the Selection of Fuses.
For use in the Primary Circuit of Three-Phase Transformers
Transformer
3-ph kVA
Fuse Reference and Rating in Amps
Fuse kV
3.6kV
7.2kV
System kV
2.4kV
4.16kV
6.9kV
25
30
40
45
63
75
100
112
125
150
200
225
300
400
450
500
600
750
1000
1250
1500
2000
2500
ADLSJ 16
ADLSJ 16
ADLSJ 20
ADLSJ 20
ADLSJ 31.5
ADLSJ 40
ADLSJ 40
ADLSJ 40
WDLSJ 50
WDLSJ 50
WDLSJ 63
WDLSJ 80
WDLSJ 100
WDLSJ 125
WFLSJ 160
WFLSJ 160
WFLSJ 200
WKLSJ 250
WKLSJ 315
WKLSJ 400
–
–
–
TDLSJ 10
TDLSJ 10
TDLSJ 16
TDLSJ 16
TDLSJ 20
TDLSJ 25
TDLSJ 25
TDLSJ 31.5
TDLSJ 31.5
TDLSJ 40
TDLSJ 50
TDLSJ 50
TDLSJ 63
TDLSJ 80
TFLSJ 80
TFLSJ 100
TFLSJ 125
TFLSJ 160
WKMSJ 200
WKMSJ 250
WKMSJ 315
–
–
TDLSJ 6.3
TDLSJ 6.3
TDLSJ 10
TDLSJ 10
TDLSJ 16
TDLSJ 16
TDLSJ 20
TDLSJ 20
TDLSJ 25
TDLSJ 25
TDLSJ 31.5
TDLSJ 40
TDLSJ 40
TDLSJ 50
TDLSJ 63
TDLSJ 63
TFLSJ 80
TFLSJ 80
TFLSJ 125
TSFLSJ 160
TFLSJ 160
WKMSJ 250
WKMSJ 315
12kV
10kV
TDLEJ 6.3
TDLEJ 6.3
TDLEJ 6.3
TDLEJ 6.3
TDLEJ 10
TDLEJ 10
TDLEJ 10
TDLEJ 16
TDLEJ 16
TDLEJ 16
TDLEJ 20
TDLEJ 20
TDLEJ 25
TDLEJ 31.5
TDLEJ 40
TDLEJ 40
TDLEJ 50
TDLEJ 63
THLEJ 80
THLEJ 100
TKLEJ 125
–
–
12.47kV
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 16
TDMEJ 16
TDMEJ 16
TDMEJ 20
TDMEJ 31.5
TDMEJ 31.5
TDMEJ 31.5
TDMEJ 40
TDMEJ 50
TDMEJ 63
TDMEJ 80
TDMEJ 100
TKMEJ 125
–
17.5kV
13.2kV
13.8kV
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 16
TDMEJ 16
TDMEJ 16
TDMEJ 20
TDMEJ 25
TDMEJ 31.5
TDMEJ 31.5
TDMEJ 40
TDMEJ 50
TDMEJ 63
TDMEJ 80
TDMEJ 100
TKMEJ 125
–
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 16
TDMEJ 16
TDMEJ 16
TDMEJ 20
TDMEJ 25
TDMEJ 31.5
TDMEJ 31.5
TDMEJ 40
TDMEJ 40
TDMEJ 63
TDMEJ 80
TDMEJ 80
TKMEJ 125
–
24kV
15.5kV
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 16
TDMEJ 16
TDMEJ 20
TDMEJ 20
TDMEJ 25
TDMEJ 31.5
TDMEJ 31.5
TDMEJ 40
TDMEJ 50
TDMEJ 63
TDMEJ 80
TDMEJ 100
TKMEJ 125
UL/CSA Fuses
General Purpose
20kV
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 16
TDMEJ 20
TDMEJ 20
TDMEJ 25
TDMEJ 25
TDMEJ 31.5
TDMEJ 40
TDMEJ 50
THMEJ 63
–
–
24kV
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 6.3
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 10
TDMEJ 20
TDMEJ 20
TDMEJ 20
TDMEJ 20
TDMEJ 25
TDMEJ 31.5
TDMEJ 40
TDMEJ 50
–
–
Special
Purpose Fuses
Canadian
Fuses & Holders
Selection of these fuses has been based on a compromise between the following:
1. The fuse should withstand transformer magnetizing inrush currents, taken as 12 times full load current for 0.1 second.
2. The fuse should coordinate with the highest rating of the secondary fuse likely to be used.
3. The fuse should operate reasonably quickly in the event of a transformer inter-turn fault or a fault in the secondary terminal zone of the transformer.
NOTES:
A. In general, the recommendations apply equally to the use of fuse in open air or in an encapsulated enclosure, since “1” and “2” above dictate the use of a
fuse current rating sufficiently above the transformer current rating to nullify any adverse thermal affect of encapsulation. However, if the transformer is
subjected to long time overcurrents, a higher rate of fuse may be required.
B. The above recommendations are not generally applicable to transformers feeding motor circuits with starting currents in excess of the rated current of the
fuse. In this event, please consult your local Edison representative.
C. Recommendations for other voltages are available on request.
D. While the above recommendations give a good general guide, recommendations for specific cases will be sent on receipt of full details of the application.
Medium
Voltage Fuses
Fuse Blocks,
Holders & Misc.
Application
Section
For additional information, visit www.edisonfuse.com
123
COOPER [ COOPER BUSSMANN, INC. ]
