Motor disconnect and sizing

[Therealcrt]

I’m supplying power to a three phase 3 hp 230 V motor that is connected to the output side of a VFD I intend to run number 12 wire on a three pole 20 amp breaker and I plan to set a disconnect on the column next to the equipment and then flex into the VFD from the disconnect question is do I have to have a fused disconnect or can I have an infused disconnect and also the VFD controller has a spot for a neutral, but I’m wondering if that’s just if it was a single face motor it’s a three phase motor. I typically don’t need a neutral.

 

[petersonra]

The manual will tell you exactly what you need. I have not seen a three phase drive with a N power input but it's possible there is one. Perhaps you could post a link to the manual.

A lot of lower cost drives these days require fuses for SCCR reasons.