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 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. 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 Rated Alternative Voltage: 230V 50Hz Transmit Maximum Current: 40A Maximum Wattage: 8.8KVA Overvoltage Action Cut-Off Value:; 270VAC +/- 5V Normal Voltage:175-270VAC Undervoltage Action Cut-Off Value:;170VAC +/- 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 Correct wiring mode: input below and output above 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.