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 will only occur if the voltage is too low for a certain period of time. Delay unit MN undervoltage release 100/130VAC/DC fixed time. Delay time fixed 0.25s. It can be deactivated with an emergency stop switch to achieve instantaneous opening of the circuit breaker.