The dual power supply protected voltage adjustable LED display is suitable for single-phase AC 220V, 50/60Hz, with a rated working current of 63A. It is primarily used for the input of residential buildings or for overvoltage, undervoltage, or overcurrent protection of distribution lines for single-phase electrical equipment. Its main function is to immediately cut off power when the circuit experiences overvoltage or undervoltage, or overcurrent issues, thereby protecting electrical equipment from damage. Additionally, the protection can automatically reconnect when the circuit voltage returns to normal. The overvoltage, undervoltage, and overcurrent settings for this product are all user-adjustable to suit local practical conditions. Features: Voltage and Power Protection - Cuts off power when the circuit has overvoltage, undervoltage, or overcurrent. Protects your home's electrical equipment from damage. Automatic Reconnection - Restores power when the circuit's voltage and current return to normal. Adjustable - Overvoltage setting range: 230V-300V, Undervoltage setting range: 140V-210V, Current setting range: approximately 1-63A. Fault delay reset time adjustable from 1-600 seconds. Dual LED Display - Two digital LED displays show the actual voltage and current independently for easier and clearer reading, functioning as a voltmeter and ammeter. Customizable - Overvoltage, undervoltage, and overcurrent settings for this product are all user-adjustable to suit local practical conditions. Specification: Rated Voltage: 220V AC Operating Voltage Range: 80V AC-400V (Single Phase) Rated Frequency: 50/60 Hz Electric Current (>A) Setting Range: 1-63A Overvoltage (>U) Setting Range: 230-300V Undervoltage (<U) Setting Range: 140-210V