Sizing Circuit breakers for a 40 HP Motor and VFD?

Hi all,

I am curious to know if anyone can provide me with a formula or a rule that sizes the circuit breaker so the circuit is protected during inrush currents. The supply is 415VAC, 50Hz. The current comming from the buildings main distribution panel is around 60 Amps. The parameters on the motor nameplate are as followed:

415VAC FLA=37.5 amps Freq=50Hz RPM=980

The VFD is a 40 HP AC drive.

Any help would be appreciated?

Kind Regards,


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Bob Ferapples

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