Difference between a shunt and undervoltage trip for circuit breaker

- May 17, 2018 -

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.
MX shunt release
The MX release opens the circuit breaker via an impulse-type (u 20 ms) or maintained order.
Opening conditions:
When the MX release is supplied, it automatically opens the circuit breaker. Opening is ensured for a voltage U u 0.7 x Un.