Is the Undervoltage Release (UVR or MN) for the Masterpact NW and NT breakers "kiss-free?"
If the UVR is not energized, will the main contacts touch when an attempt is made to close the breaker?
Masterpact NW and NT
They are kiss-free. If the undervoltage trip is not energized it is impossible to close the circuit breaker either manually or electrically. An attempt to close the circuit breaker produces no movement of the main contacts. Closing is allowed when the supply voltage of the undervoltage trip reaches 85% of rated voltage.
The undervoltage trip (MN) instantaneously opens the circuit breaker when its supply voltage drops to a value between 35% and 70% of its rated voltage.