GW2S seies moulded case circuit breaker, it is applicable to circuit of AC 50Hz (or 60Hz), rated insulation Voltage 660V, rated operating Voltage under AC 660V, 250V(DC), rated operating cruuent 10A-800A, for distributing energy of electricity and infrequent making and breaking circuit in normal conditions. The MCCB rated current is under 400A they are provided with the function of protection against overload and short circuit and undervoltage. The MCCB complies with standard of IEC 947-2, GB14048.2, GB14048.4, 4 and so on.