1、The automatic recovery overvoltage and undervoltage protection devices meet modular design standards. 2、The product board uses high-quality electronic components for reliable performance. 3、When the power supply is unstable, its protection function will be activated automatically. Once the voltage exceeds a limited range of products, it will automatically cut off to protect the safety of electrical equipment and personnel. 4、When the power returns to normal, the device will re-power it within 1 minute. 5、The green indicator light indicates that the power supply is working properly. The red indicator light indicates overvoltage or undervoltage. Features: The automatic recovery overvoltage and undervoltage protection devices meet modular design standards. The product board uses high-quality electronic components for reliable performance. When the power returns to normal, the device will re-power it within 1 minute. The green indicator light indicates that the power supply is working properly. The red indicator light indicates overvoltage or undervoltage. Specification: Function: Overvoltage&Undervoltage Protection Transmit Maximum Current: 40A Maximum Wattage: 8.8KVA Overvoltage Action Cut-Off Value:> 270VAC +/- 5V Undervoltage Action Cut-Off Value:<165VAC +/- 5V Overvoltage&Undervoltage Cut-Off:<1S Power Transmission Delays After Blackouts:<60s Power Consumption :<2W Motor Service Life:100000 Times Size:77 x 35 x 45mm / 3.03 x 1.38 x 1.77in Installation: 35mm DIN Rail Package List: 1 x Protector Note: When connecting the product for the first time, you must wait for about 1 minute. Only when the red light goes out, can the product work normally. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.