1、WORKING PRINCIPLE: DC battery switching module automatically switches between two power sources to supply power continuously. 2、CONTINUOUS POWER SUPPLY: When the main power supply is energized, the standby power supply is not connected and outputs the main power supply; when the main power supply is disconnected, the standby power supply is automatically connected and outputs the standby power supply. 3、FAST SWITCHING: When the main and auxiliary power supplies are switched, there is only an interval time of ms levels in between. 4、LONG TERM USE: Automatic emergency power switch can provide efficient power transmission, designed for long term use without performance degradation. 5、PCB MATERIAL: The DC power switch module is made of PCB material, which will not be deformed after long time use, thus ensuring the stability for a long time. Item Type: Battery Automatic Switch Module Material: PCB Rated Output Current: 30A 1 x Switch Module 1 x Housing 1 x Housing Accessories 4 x Screws