MCCB AA series moulded case circuit breaker, is suitable for the circuit of AC 50Hz (or 60Hz),rated insulation Voltage 660V, rated operating Voltage under AC 660V, 250V(DC),rated operating current 25A-630A. It is for distribute energy of electricity and infrequent making and circuit in normal conditions. The MCCB rated current under 630A. They are provided with the function of the protection against overload and short circuit and under voltage. The MCCB complies with standard of IEC 947-2.