Feature: 1. Excellent Performance: This protector features quick response, automatic reset, prevent long time power failure. 2. Overload Protection: When the protector is overloaded, it will automatically cut off the power supply and supply power normally within the specified power range to prevent the danger of overvoltage and undervoltage. 3. Digital Display: Comes with a digital display to display the working voltage and current of the protector, you can rest assured to use it! 4. Easy to Install: The installation of this protector is simple and easy to operate. Adopts DIN rail installation, which is stable and firm after installation. 5. Ideal Replacement: This protector can be easily installed, ideal replacement for the old and damaged parts. Specification: Item Type: Adjustable V A Protector Material: PC Rated Power Supply Voltage: AC220V, AC380V Operating Voltage Range: AC80-400V (three phase), AC140-700V (three phase) Rated Frequency: 50, 60HZ Overvoltage (Greater Than U) Setting Range: 230-300V 390-500V Undervoltage (Greater Than U) Setting Range: 210-140V 370-260V Greater Than U and Less Than U Trip Delay: 0.1 to 30s Reset, Start Delay: 1 to 500s Voltage Measurement Accuracy: 2% Rated Insulation Voltage: 400V 700V Output Electric Shock: 3NO Electrical Life: 100000 Times Mechanical Life: 1000000 Times Protection Grade: IP20 Pollution Degree: 3 Altitude: Less than or Equal to 2000m / 6561.7ft Operating Temperature: - 10 ℃ to 50 ℃ Humidity: Less than or Equal to 50% is 40 ℃ (non condensing) Storage Temperature: - 10 ℃ to 55 ℃. Package List: 1 x Adjustable V A Protector1 x Manual Note: The voltage displayed between the live wire and the neutral wire is 220V, and the voltage displayed between the live wire and the live wire is 380V.