Fuse Resistance Values
A cold resistance test of a fuse provides the primary indication of the fuse's integrity. Monster tests and posts resistance values to ensure you and your customer receive a safe-to-install product every time.
To find the resistance values for your fuse, navigate to www.monsterfuses.com and use the Search Fuses function, and then select your fuse rating in the results window.
Monster Fuses is proud to be the only company to offer an open database of resistance values.
Below are Suggested Amp. ratings for Transformer and Motor Starter applications.
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 |