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| Not clear what you are doing but the basics are that the breaker sizing is there to protect the cabling to vfd. The vfd takes care of overload protection of the complete circuit between point of supply and the motor itself since the vfd will be set to protect the motor from overload. And since all cables are sized larger than what the motor requires, then the vfd protects its input cabling too. The breaker basically is protecting the cable supplying the vfd and any high amperage fault up to and including the motor. Generally size breaker 125% to 150% larger than cable although code should allow up to 250% larger if I remember right. No motor in rush to allow for because of vfd so the 125-150% rating would be preferred. | |
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Blower motor breaker size
