Brand new compressor triggering "overload release motor protection switch"

[Open Ocean Diver]

Not much different 380, 400 3ph, should draw around 8 amps. Dial is hard to read look close make sure it’s set to the FLA written on the motor name plate.

 

[BRT]

Not much different 380, 400 3ph, should draw around 8 amps. Dial is hard to read look close make sure it’s set to the FLA written on the motor name plate.

Closer to 12

 

[Open Ocean Diver]

Closer to 12

Only with a very low PF.

 

[BRT]

Only with a very low PF.

At full load it shouldn't have a low power factor. I was fudging low to make sure I wasn't wrong. I wasn't. 5.5 KW has to be about 7.5 hp.
https://sprecherschuh.com/ecatalog/get/Other/hp-volts-fla_charts.pdf.

Chart shows 14 amps. If voltage is at the low end amps will be higher.

 

[Open Ocean Diver]

Awww I didn’t assume HP, just went with 5.5KW at 400 volts. Also the wire gauge looks small for a 7.5 HP motor to me anyway.
I(A) = 1000 × P(kW) / (√3 × PF × VL-L(V) )

 

[BRT]

Awww I didn’t assume HP, just went with 5.5KW at 400 volts. Also the wire gauge looks small for a 7.5 HP motor to me anyway.
I(A) = 1000 × P(kW) / (√3 × PF × VL-L(V) )

Typical 460v 3 phase motor amps are 1.3 times HP. This varies of course. 5.5 KW is about 7.5 hp. 5500 watts divided by 746 watts per HP comes close to 7.5 HP. The amperage number drops with higher voltage and rises with lower voltage, even on the same winding setup. Running a 460 volt motor at 490 uses less amperage, at 440, more.

 

[Open Ocean Diver]

If it was a 7.5 hp motor the circuit breaker for motor protection would be to small.

I agree with you if it was a 5.5 KW motor but we don’t know that yet.