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Discussion Starter · #1 ·
Hello,

I have a query concerning a Motor Control Center (MCC)feeding 3-phase 575V motor loads.

Do MCC usually have a feature to automatically trip the circuit feeding 3-phase motors, if a phase is lost? OR would the motor still run off two phases, overload and then eventually burn out?

Thank you.
 

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Most of the MCC I've seen and put together don't have them. I see them on the substations we use up stream from the Motor Control Centers.

ABB and Eaton make decent phase monitors which as mentioned before can be installed.
 

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Discussion Starter · #5 ·
Thank you all for your inputs. Integrating phase loss relay into the existing MCC seems to be a straight forward solution to mitigate this issue, because replacing motors when they burn out due to phase loss is much more expensive endeavor.
 

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And if not, some of the cheapest (cost not quality) 3 phase line monitor relays can be purchased at AC supply stores, like the Carrier store. Buying the same items from electrical suppliers seems to double the cost.
 
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