... for the circuit of AC50Hz/60Hz,rated insultation voltage 660V. SGT1 Moulded Case Circuit Breaker (MCCB) is also suitable for the ... of electricity and infrequent making and circuit under normal conditions.SGT1 are provided with the function of the protection against overload ... and short circuit and undervoltage.The SGT1 complies with standard of IEC60947-2.