Brandon Loyd
Senior Member
I have a compressor motor without thermal overload protection built in. I need to install a breaker and wire. Do I size my breaker at 125%. It has a 400 amp breaker now with a 300 amp trip. Wire is 3/0 TW and Motor FLA is 173amps. I am thinking a 225 amp breaker with 3/0 THHN, but I beleive if I go with a 250 amp breaker, I can keep the same Frame size and mounting equipment. Would a 250 amp breaker with 4/0 THHN be ok?