air compressor breaker size


Old 02-19-10, 12:49 PM
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air compressor breaker size

I just bought an air compressor its a 5hp 220v and the tag says 22a on the motor. What size breaker do i need.
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Old 02-19-10, 12:54 PM
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If the FLA on the nameplate says 22A, you need #10/2g cable, a NEMA 6-30 receptacle and corresponding plug on the compressor, and a 30A double-pole breaker.
Old 02-19-10, 02:23 PM
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Breakers are good for about 80% of their 'capacity' so a 30 amp breaker is good up to about a 24 amp draw.

Makes me think less of my compressor now, it's only a 110v model. :-(
Old 02-20-10, 11:57 PM
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For 5 HP motour on this size typically can use 30 amp breaker if starting is not a issue but if tripped with starting you can increase to 40 or 50 amp breaker only if the motor do have build in thermal protection switch in there.

This part only good for hardwired motors only cord et plugs are not allowed to use oversized breaker due the rating of cord and plut set up.


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