This is a MX shunt trip release for Compact NS 630b to Compact NS 3200 devices. Its rated voltage is 12VDC. It is an auxiliary used for emergency off or remote opening applications. This auxiliary opens the circuit breaker when the control voltage Un rises above 70% of its rated voltage Un. It complies with IEC 60947-2 standard. Compact NS 630b to Compact NS 3200 device can be equipped with 1 MX or 1 MN auxiliary.