Schneider Acti 9 iMN Undervoltage Release, 220-240VACAUXILIARY MNx is as an emergency stop device working with both a constant voltage feeding and a monitoring loop. Under the presence of the voltage, the MNx will trip the protection device as soon as the monitoring loop will be opened. Trips the device with which it is combined when its input voltage decreases(between 70% and 35%Un); Prevents device closing again until its input voltage is restored.