Modular Design: Overvoltage and undervoltage protection with automatic reset function meets modular design standards. Reliable Material: The overvoltage and undervoltage protector is made of high-quality electronic components for reliable performance. AC Rated Voltage: 230V 50Hz, Maximum Transfer Current 40A. Overvoltage Protection: The protection function is automatically activated when the power supply is unstable. When the voltage exceeds the product's limited range, the product will automatically shut off to protect the safety of electrical equipment and personnel. Indicator Light: When the power supply returns to normal, the adjustable voltage and current protector will restart within 1 minute. The green light indicates that the power supply is working normally. The red light indicates overvoltage or undervoltage. Tips: When connecting the product for the first time, wait about 1 minute. Only when the red light goes out can the product work normally.