AQC45 automatic transfer switch is suitable for the dual power supply system of AC50Hz ,rated operational voltage 400V/230V, rated operational current up to 63A. Automatically trans-fer one or multi-load circuits from one power to the other power, to protect power suppliednormally to load circuit. The device mainly used for industry, shopping center, bank, high building and so on. The device comply with IEC60947-6-1.