Circuit Breaker Sizing for 30 KW Motor
Circuit Breaker Sizing for 30 KW Motor
(OP)
I need to install circuit breaker on 3 Phase Motor ( 30 KW). This motor is installed at Screw air compressor ( direct coupled). Motor voltage 400VAC, 50 Hz
Please advise size of breaker which should be installed. Motor Name Plate data is attached.
Please advise size of breaker which should be installed. Motor Name Plate data is attached.





RE: Circuit Breaker Sizing for 30 KW Motor
We reach for the Electrical Code book.
For DOL starting of a squirrel cage induction motor the code maximum is 250% of rated current with exceptions.
Consult your local code.
Bill
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"Why not the best?"
Jimmy Carter
RE: Circuit Breaker Sizing for 30 KW Motor
Are you sizing the CB that feeds the Air Compressor's Panel Board or the CB that will directly feed the motor?
Maybe a single line diagram will help us understand your requeriments
Regards.
JBC
.......
"The more I read, the more I acquire, the more certain I am that I know nothing"
RE: Circuit Breaker Sizing for 30 KW Motor
CB will directly feed the three phase motor.....
RE: Circuit Breaker Sizing for 30 KW Motor
You can just select it from a catalogue (i attach an example)
BEWARE: The rated Volts/frecuency/kA Icu must be in accordance with your installation
JBC
.......
"The more I read, the more I acquire, the more certain I am that I know nothing"