1、Working Principle: 12V power automatic switch module, through the two power supply automatic switching to ensure continuous power supply. 2、Main Power Supply Energized: When the main power supply is energized, the standby power supply is not connected and outputs the main power supply. 3、Main Power Failure: When the mains power failure, the standby power supply is automatically connected and the standby power supply is output. 4、Main Power Supply Energized Again: When the main power supply is energized again, the standby power supply is automatically cut off and the main power supply is output. 5、Ultra Short Interval Time: When the main and auxiliary power supplies are switched, there is only a ms level interval time in between, which is stable and reliable. Item Type: Power Automatic Switch Module Material: PCB Voltage: 12V Rated Output Current: 30A 1 x Power Automatic Switch Module 1 x Housing 1 x Housing Accessory 4 x Screws