This is a MX shunt trip release for Compact NS80H-MA and Compact NSC100N devices. Its rated voltage is 220VAC to 240VAC 50/60Hz. 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 NS80H-MA and Compact NSC100N devices can be equipped with either 1 MX or 1 MN auxiliary.