Dual Power Automatic Transfer Switch 4P 125A CB Level Mini Generator Changeover Switch with Indicator AC400V Item Type: Dual Power Automatic Transfer Switch Material: PC Flame Retardant, Brass, PCB, Silver Model: GFQ3 125 4P Current: 125A Operating Frequency: 50Hz Rated Voltage: AC400V Working Voltage: AC380V Display Function: Indicator light display Operation Mode: Automatic, manual ATS Level: CB level Conversion Time: ≤2s Usage Level: AC 33iB Conversion Method: Automatic switching and automatic recovery Mechanical Life: Automatic: 3000 times, Manual: 1500 times Compliance Standard: IEC947-6-1GB14048.11 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 of the two way power supply, when the incoming phase A and N common switch voltage is normal, regardless of whether the voltage of the public power supply B C and the standby switch a b c and N is normal, the public switch will be closed first, 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 two way power supply is switched to standby, the power indicator and standby close indicator are on. Manual function, no matter whether the public 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.