Voltage Trip Releases

Use voltage trip releases to trip circuit breakers deliberately using an electrical signal. Install these auxiliaries in the case under the front face.

The characteristics of these auxiliaries comply with the recommendations of the standard IEC/EN 60947-2.

MN undervoltage trip release

This release:

Trips the circuit breaker when the voltage is less than 0.35 times the rated voltage Un. If the voltage is between 0.35 and 0.7 times the rated voltage Un, tripping is possible but not guaranteed. Above 0.7 times the rated voltage Un, tripping is impossible.
Allows to close the circuit breaker again once the voltage reaches 0.85 times the rated voltage.

Use this type of trip release for fail-safe emergency stops.

Time-delay unit

Time-delay unit for MN undervoltage trip release

The time-delay unit eliminates nuisance tripping of an undervoltage trip release due to transient voltage dips lasting < 200 ms.

There are two types of time-delay units: adjustable or fixed.

MX shunt trip release

This release trips the circuit breaker when the voltage exceeds 0.7 times the rated voltage Un.