Feature: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.Specification:Item Type: Power Automatic Switch ModuleMaterial: PCBVoltage: 12VRated Output Current: 30A.Package List:1 xPower Automatic Switch Module1 x Housing 1 xHousing Accessory4 x Screws