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I HAVE 7.5 HP VERT 80 GAL TANK COMPRSSOR IT KEEPS BURNING CONTACTS ON PRESSURE SWITCH. CONTACTS STICK TOGETHER AND COMPRESSOR WON'T SHUT OFF AFTER REACHING PRESSURE. WHAT'S CAUSING THIS?

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Contacts on switches, contactors, starters are rated in amperes, volts, and horsepower. Your motor is probably a 40 amp/230V/ 1phase on a 50 amp circuit. If it's a 3phase motor, it is a 25 amp motor on a 40 amp circuit.
A 7.5 HP motor should be on a contactor or starter, not on a pressure switch because of the amount of current or amperes used. Otherwise, use a pressure switch rated for 7.5 horses at voltage supplied.

Posted on Apr 23, 2015

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There is a capacitor across the contacts
To absorb the inductive collapse if the motor.

But this problem usually only happens to DC motors not AC.

If the starting Cap has 2 leads I'm stumped if it has 3 leads replace it.

Posted on Apr 22, 2015

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