Item Type: Automatic Transfer Switch Model: SJCS Q1 63 4P Rated Current: 63A Rated Voltage: 400VAC Frequency: 50Hz Poles: 4P Rated Impulse Withstand Voltage: 4KV Insulation Voltage: 4000V Breaking Capacity: 4KA ATSE Level: CB level Working Principle: The power supply signal of the dual power supply controller and drive mechanism of this series depends on the A phase and N line of the input port of the common switch or standby switch. In the automatic state, when the incoming phase A and N common switch voltage is normal (AC190-240V), the public switch will be closed first regardless of whether the voltage of the public power supply B. C and the backup switch a.b.c and N is normal. At the same time, the power indicator and the public shutdown indicator light up. When the incoming public switch phase A and line N have no voltage, and the incoming standby switch phase A and line N have normal voltage, whether the voltage of normal switch B and standby switch C is normal or not, the 2 way power supply is switched to standby. The power indicator and standby close indicator are on. Manual function, no matter whether the normal power supply and standby power supply have voltage, can use manual operation mode. In case of manual operation, the manual automatic button shall be placed in the manual operation position. Turn the push handle clockwise to the terminal, the standby power supply air switch R is open, and the public power supply air switch N is closed. When the push handle rotates counterclockwise to the terminal, the standby power supply air switch R is closed and the public power supply air switch N is open.