Thank you all for your very helpful comments. The starting components (i.e., 150 amp frame breaker, NEMA Size 4 mag starter) were salvaged from an outside vendor. I originally suspected that the breaker's sensing element (I don't know if it is thermal or magnetic) was weak, and tripping on a...
Can anyone advise me about why a motor can megger perfectly, but yet trip the breaker within seconds after starting?
I have a 75 H.P. supply fan motor, 1750 RPM, 89 Full Load Amps, 460 v. three phase. The 150 Amp breaker trip setting is adjusted to 6 x the frame rating. From my understanding...
