Feature: 1. [Voltage Transfer Switch] The 3 phase voltage transfer switch allows for simultaneous connection to the mains, generator, and inverter. When the main power supply fails or the voltage exceeds the set range, it automatically switches to the next power supply. 2. [Flexible Settings] This automatic transfer switch allows you to set the priority order of the mains, generator, and inverter. You can set the voltage threshold for automatic switch over during under or over voltage situations. 3. [Multiple Protections] Offering under voltage, over voltage, and over current protection, the over under voltage protector ensures the safety of your electronic devices and prevents damage. 4. [LED Display] The phase selector features 4 screens providing real time voltage readings of each power source and the voltage and current of the currently used source, facilitating real time monitoring of the circuit condition. 5. [Adjustable Parameters] The 3 phase voltage protector allows you to adjust parameters such as conversion time, reset time, over under voltage protection, and over current protection within a set range. It offers an adjustable reset time between 1 to 30 seconds. Specification: Item Type: 3 Phase Over Under Voltage Protector Material: PC Flame Retardant Model: STVP 935S Rated Power Supply Voltage: AC220V Working Voltage: AC80-400V (Single Phase) Rated Frequency: 50 60Hz Rated Current (Ice): 40A Current (>A) Setting Range: 40A Overvoltage (>U) Setting Range: 230-300V (Default 270V) Undervoltage (<U) Setting Range: 210-140V (Default 170V) Reset Start Delay: 1-30s (Default 1s) Voltage Measurement Accuracy: 2% (Not Exceeding 2% of Total Range) Rated Insulation Voltage: 400V Output Electric Shock: 1NO Electrical Lifespan: 100,000 times Mechanical Life: 1,000,000 times Protection Level: IP20 Pollution Level: Level 3 Altitude: ≤2000m Working Temperature: -50℃ to 55℃ Humidity: 50% at 40℃ (Non Condensing) Storage Temperature: -30℃ to 70℃ Installation: 35mm DIN Rail. Package List: 1 x 3 Phase Over Under Voltage Protector