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. |
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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 |