On Jan 30, 5:09 pm, zxcvbob wrote:


7. a bad unloader valve (maybe that's what you meant by the pressure switch)


My CH compressor manual calls it a pressure switch. It's a pressure
operated contactor that opens the ac line input when it gets to
operating pressure. I once had a pressure switch go bad (weak spring &
arcing contacts) and it would trip the breaker like the OP described.
-Bob S.