The function of the dual power 220V automatic switch module is to realize automatic switching of two power supplies. The main power supply is connected to the common main power supply, and the auxiliary power supply is connected to the backup power supply. The output power supply voltage is equal to the input power supply voltage. When the main power supply has no voltage output, the module automatically switches to the backup power supply output. When the main power supply is restored, the module automatically switches to the main power supply output. 1. Input voltage: AC90-220V 2. Output current: maximum 30A 3. The two power supplies are automatically switched, with only ms interval time in between (The product printed words depending on the batch, but this does not affect use) Color: Blue Material: PCB Package Contents: 1 Switch Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.