Transformer, Motor Starter Fuse Ratings Monster Fuses (888)444-4335

WESTERN U.S. 888-444-4335

EASTERN U.S. 877-444-1798

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Ratings shown are for general information only.

Proper fuse selection depends on many factors, consult a professional engineer for your application.

Transformer Fuses

Suggested Fuse Current Ratings for Power Transformer Applications
  2400V 4160V 7200V 12470V 13800V

KVA
Full
Load
Amps
Fuse
Rating
Amps
Full
Load
Amps
Fuse
Rating
Amps
Full
Load
Amps
Fuse
Rating
Amps
Full
Load
Amps
Fuse
Rating
Amps
Full
Load
Amps
Fuse
Rating
Amps
30 7.2 15E 4.2 10E 2.4 5E 1.4 3E 1.3 3E
45
10.8 15E 6.2 10E 3.6 5E 2.1 5E 1.9 3E
75 18 25E 10.4 15E 6 10E 3.5 5E 3.1 5E
112.5 27 40E 15.6 25E 9 15E 5.2 10E 4.7 10E
150 36 50E 20.8 30E 12 20E 7 10E 6.2 10E
225 54 80E 31.3 50E 18 25E 10.4 15E 9.4 15E
300 72 100E 41.6 65E 24 40E 13.9 20E 12.5 20E
500 120 200E 69.4 100E 40 65E 23.1 30E 21 30E
750 180 250E 104 150E 60 100E 34.7 50E 31 50E
1000 241 350E 140 200E 80 125E 46.3 65E 42 65E
1500 360 600E 208 300E 120 200E 69.6 100E 62 100E
2000 481 750E 278 400E 160 250E 92.5 125E 84 125E
2500 600 1100E 346 600E 200 350E 115.5 175E 104 175E
3000 - - 406 600E 240 350E 139 200E 130 200E
The fuse size shown will permit transformer overloading by at least 133% of its self cooling rating. Fuse sizes meet the 12 times full load current for 0.1 seconds and 25 times full load current for 0.01 seconds inrush criteria.


Motor Starter Fuses

Maximum Motor Full Load Current Amp Rating For Full Voltage Start
Fuse R
Rating
Fuse Amp
Rating
10 Second
Start
3 Second
Start
2R 70 28 32
3R 100 40 45
4R 130 55 65
6R 170 80 95
9R 200 125 140
12R 230 165 190
18R 390 250 280
24R 450 330 360
36R 650 500 550