To prevent false tripping of the circuit breaker in the event of short-term voltage drops, this delay unit MN can be installed to delay the undervoltage release MN. The tripping only occurs when the voltage is too low for a certain period of time. Delay unit MN undervoltage release 380/480V AC/DC time adjustable. Delay time adjustable 0.5s - 1s - 1.5s - 3s. It can be deactivated with an emergency stop switch to achieve an instantaneous switching off of the circuit breaker.