This is a MN undervoltage release for Compact NS 630b to Compact NS 3200 devices. Its rated voltage is 24VDC to 30VDC, or 24VAC 50/60Hz. It is an auxiliary used for emergency shut-off or remote opening applications. This auxiliary opens the circuit breaker when the control voltage drops to a value below 35% of its rated voltage, Un. It complies with the IEC 60947-2 standard. Compact NS 630b to Compact NS 3200 devices can be equipped with 1 MX or 1 MN auxiliary.