Compressor runs for about five seconds then blows the breaker

by Mike Weiss
(Maple Grove MN)

Emerson electric motor label

Emerson electric motor label

could this be caused by the running capacitor?

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Mike, you are not giving us much to go on.

Are you running your compressor motor in 120 or 240 volt configuration?

Does the compressor run if the air tank is empty when you start it?

Are you using an extension cord if running the compressor on 120 Volts?

How old is your compressor?

What is the make, model?

Sure, it could be the capacitor, and you can see the page on this site about how to check that.

Otherwise, it is difficult to say without a lot more info.

Cheers,

Bill

Comments for Compressor runs for about five seconds then blows the breaker

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Dec 21, 2012
Compressor motor blows breaker
by: Mike weiss

Bill! The compressor is a Black Hawk 5 HP as I recall, Running on 120V. I took the belt off the pump just to make sure the pump wasn't holding it back. even without any resistance the motor blows the breaker after a few seconds...Mike
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Hi Mike... OK Black Hawk I believe, don't believe it's a 5HP if you are powering it with 120 volts.

Regardless, if you are not using an extension cord and the problem persists with no load on the motor, then yup, the first thing to look at is if the start and run (might be two - might be two in one) capacitors are OK. See that page for details.

Cheers,

Bill


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4hp 13 gallon air compressor trips breaker

by Jill
(MN)

Got a 4hp 13 gallon oil less air compressor the problem is that it builds air fine but when it gets low on air and tries to kick back on it just humms and trip the breaker any clues? the motor im guessing? please help
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Jill, turn off the compressor. Drain the tank. Turn the air compressor back on. Did it start OK? Respond as a comment here, please.

Bill

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After the power turn on the compressor stays on five minutes and the breaker blows.

by Steve Smith
(Chicago, IL USA)

Serial# SF COM10030 COMP; SCROLL 4.5 TON
SXR054B1RPZ 208-230/60/1
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Steve, happy to post this for you in case someone has info for you. I don't know anything about HVAC compressors, sorry.

Bill

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Compressor will not restart and trips breaker

my air compressor will not restart after the first start up cycle. ive changed pressure switch with new unloader valve. ive changed check valve. ive tryed multiple higher amp ac circuits. compressor acts the same after first cycle of pressure in tank it trys to restart after low pressure level trips, compessor trys to start and eventually trip breaker
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OK, you don't say after you changed the pressure switch (probably not needed) and unloader valve, whether when the compressor comes up to cut out pressure and stops your unloader valve actually is unloading the compressor.

You also do not describe your power supply to the compressor, nor it's make & model and HP.

It is hard to help you diagnose the problem without these details.

So, if the compressor starts with the tank empty of air, and the unloader valve is working on high pressure cut out, provide more details as a comment here and I'll try to help you figure out what the problem is.

Bill

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Jul 30, 2013
More info
by: Dave

Compressor is Campbell Hausfeld 3.5hp don't know model no. Same symptoms before and a.fter I changed switch with new unloaded. Tried plugging directly into 20a breaker as well as dedicated 30a breaker with no other loads on circuit. I could hear unloaded hiss for split second at trip tank pressure . Also I am able to recharge tank if I completely evacuate tank down to 0-10psi.
Unloaded valve is part of switch assembly

Thanks for the help
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OK, if the unloader works, that frees up the piston, removing some of the load from the motor when it tries to start.

Plugging the compressor into a higher amp socket also was a good idea.

It is time now to look at the start capacitor as the source of the problem.

Jul 26, 2013
restart trips
by: Doug in s.d.ca

Probably a good idea to check the the start/run capacitor(s)...

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