I have a 220 volt air compressor that blows one side of a two-pole 40 amp breaker and will not run.

by Bret
(Galt,ca )

I have a kobalt. M : k758ov2.

7.5 Hp Peak 5.0 Hp running
208-230 volt Single phase
22 amp
the air compressor is kicking off one side of a2 pole E 40 amp breaker. after reading all postings I have drained the tank to 0 p.s I and turned on the compressor and it just kicks but will not run. check the breaker again and only the one side is kickoff. like you electricity scares me. I have put breakers in my main box install new circuits in the garage but I don't know anything about the electric motor. the motor is a century AC motor. it has 2 capacitors on top and a reset button that is not popped. I'm hoping it's a capacitor and would like to know how to test a capacitor. please help sincerely Bret
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How to test a capacitor page is found on this site, Bret.

I hope someone more electrically inclined can respond to help you out with this compressor problem.

Bill

Comments for I have a 220 volt air compressor that blows one side of a two-pole 40 amp breaker and will not run.

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Jun 17, 2013
thank you for the advice
by: Bret

thank you for that advice,
I have already checked all connections, even the 220 duplex in the wall. I just happen to have a two-pole 50 amp breaker for a sub panel I'm planning to put the air compressor in the shed farther away from the garage. even though that they're the most expensive breaker on the market it's still a lot cheaper than a motor.

PS as far as testing the capacitors. I put a screwdriver across the two terminals. no spark and no OME reading on the two that are on the motor and one that a friend gave me to try. I'm puzzled can they all be bad?

Jun 10, 2013
on the right track
by: Gregg Pfaff

your thought of a start capacitor being bad is a good one. I'd want to see what the amp draw at startup is on the side that's tripping. I'd also check all connections to make sure they're good connections etc. Also, not all breakers are motor load rated Breakers...could this be the problem? Even if it worked ok for awhile a non-motor load rated breaker won't take the surge at start up for ever. also, if any breaker has tripped often it will require replacement. Any breaker will only take so many trips before it gets weakened and fails.

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