Motor Starter used as a circuit breaker?
Motor Starter used as a circuit breaker?
(OP)
End user is trying to minimize project cost and has a spare starter in an MCC that he wants to reuse and serve a piece of packaged mechanical (multiple motors) equipment. The equipment is equipped with an integral control panel that protects the motors. The starter would protect the feeder only. The starter includes a motor circuit protector and thermal overload element.
I've never seen this application and not sure that I may have a problem. Any thougths?
Thanks
I've never seen this application and not sure that I may have a problem. Any thougths?
Thanks






RE: Motor Starter used as a circuit breaker?
RE: Motor Starter used as a circuit breaker?
RE: Motor Starter used as a circuit breaker?
As dpc says you must change the MCP and remove the overload relay. The starter/contactor may have a rating as a contactor that will allow it to be used as a switching device if that is dsirable.
Some of the magnetic motor starters that I purchase are a combination of a contactor with NEMA motor ratings, IEC motor ratings and additional ratings for use as a contactor,
And an overload relay, priced and sold separately.
respectfully
RE: Motor Starter used as a circuit breaker?
RE: Motor Starter used as a circuit breaker?
I was following (and agreeing with) dpcs post. I meant to add that after proper overload and over current protection was installed, the starter could be used as a contactor if there was a wish to control the circuit remotely.
This would be contingent on the contactor haveing an adequate current rating when used as a contactor.
respectfully