Quick Compressor Question

I think I know the answer to this but....
I’m looking for a new compressor and the one I found the tag on it says 208/230 volt and Amp draw of 23/21. My current one says 240 volt and 14.0 amps. The breaker switches in my electrical panel says 20 on it. So do I need to change out the breaker with a higher amp switch? (I wouldn’t do it myself)
Thanks

 

I'm gonna guess the 208/230 volt unit is three phase, which is industrial power. It won't run on residential power, which is single phase (actually two phases of 120, for a total of 240 volts). Check the spec plate on the motor for number of phases.

 

It does say the new one is 1 phase.

 

Then if it's 21 amps continuous at 230 volt, I'd put it on a minimum 30 amp breaker, so the startup surge doesn't pop the breaker.

 

If you go with a 30 amp breaker you will need #10 wire.

 

Thanks for the info.

 

That amount of amperage draw indicates a less than quality motor.....
the 14-15 amps your current compressor motor draws is more inline with normal.
A good 220 single phase motor should not require that amount even momentarily at startup......
all that is assuming Canadian method of ratings of amp draw are similar to USA.

 

That is some great info fellow's !!!! Thank's

 

21 amp draw at 230 is a 5 hp motor. His older compressor is probably a 3 hp motor so it draws less current.

 

Don't put in a heavier breaker unless you install heavier wiring to match. Too much current draw will cause the wiring to overheat and possibly burn or short out. The breaker or fuse is in there to prevent such problems. If you put in a heavier breaker you will negate the protection.

 

I would try it as is first. If you keep tripping the breaker, then spend the $ for an electrician to add a 30 amp breaker and required wires size upgrade as stated above. It's very possible it will work with no modifications.​

ASEET electrical/electronics + 30 years experience ​