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What Ampere fuse (A) is needed?

What Ampere fuse (A) is needed?

Update Time:2021-07-02


At 575 volts, a 3-phase motor draws 1 amp per horsepower. 

At 460 volts, a 3-phase motor draws 1.27 amps per horsepower. 

At 400 volts, a 3-phase motor draws 1.5 amps per horsepower. 

At 230 volts, a 3-phase motor draws 2.5 amps per horsepower. 

At 230 volts, a single-phase motor draws 5 amps per horsepower. 

At 115 volts, a single-phase motor draws 10 amps per horsepower. 

These numbers above have no safety margin. For example a 10hp compressor=15A, the standard fuse size is 16(A). To be safe for peaks we recommend the 20(A) fuse. Please check with a certified electrician.