HMI3 series moulded case circuit breaker,It is applicable circuit of AC 50(HZ)(or 60HZ),rated insulation Voltage 660V,rated operating Voltage under AC660V,250V(DC),rated operting current 10A-800A,for distribute energy of electricity and infrequent making and breaking circuit,in normal conditions,The MCCB rated current under 400A they are provided with the function of the protection against overload and short circuit and undervoltage,The MCCB complies with standard of IEC947-2,GB14048.2 GB14048.4 and so on.