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 Module Material: PCB Voltage: 12V Rated Output Current: 30A. Package List: 1 x Power Automatic Switch Module1 x Housing 1 x Housing Accessory 4 x Screws