Breaker and overload selection

Thread Starter

jiugo.llamas

Joined Nov 23, 2007
10
Hi everyone, I would liketo know if there is any formula which I can use for the breaker and overload of a motor starter selection based on the motor´s hp´s or power, how can I select the right protections?????

Best regards

Hugo
 

gerty

Joined Aug 30, 2007
1,291
Chances are pretty good that your calculation will fall between the available fuse size (eg 4.5 amps) . You'll need to go to the higher size and probably a time delay or slo-blo fuse. A time delay will allow the higher startup current
to pass for a short time, but will blow if the current remains high..
 
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