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What is the Main Function for the Under voltage release coil (MN) installed inside NSX MCCB ?

MN undervoltage release

The MN release opens the circuit breaker when its supply voltage drops to a value below 35 % of its rated voltage Un.

Undervoltage tripping, combined with an emergency-off button, provides fail-safe tripping.

The MN release is continuously supplied, i.e. if supply is interrupted:

either voluntarily, by the emergency-off button,

or accidentally, through loss of power or faulty wiring,

the release provokes opening of the circuit breaker.

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