Feature: 1. 3 Phase Transfer Switch: This automatic 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 another power supply. 2. Flexible Setting: This voltage changeover switch allows you to freely set the priority order of the mains, generator, and inverter, and can set the switching voltage threshold to automatically switch in case of undervoltage or overvoltage. 3. Safe Electricity Use: This 3 phase changeover switch provides undervoltage, overvoltage, and overcurrent guard to ensure the safety of your electrical equipment, with a 2% voltage measurement accuracy, which is reliable and practical. 4. LED Display: This automatic transfer switch has 4 LED screens, which can provide real time voltage readings for each power supply, as well as the voltage and current of the current power supply, and monitor the circuit condition in real time. 5. Adjustable Parameter: Supports adjusting conversion time, 1‑30 second range reset time, overvoltage and undervoltage guard threshold, overcurrent guard parameters, effectively preventing power system damage. Specification: Item Type: Voltage Transfer Switch Model: STVP 935S Material: Flame Retardant PC Rated Power Supply Voltage: AC220V Working Voltage: AC80-400V (Single Phase) Rated Frequency: 50/60HZ Rated Current(Ie): 63A Maximum Working Current (Within 10 Minutes): 80A Maximum Load Power: 13.9KW Current Setting Range(>A): 63A Overvoltage Setting Range(>U): 230-300V (Default 270V) Undervoltage Setting Range(<U): 210-140V (Default 170V) Reset Start Delay: 1-30s (Default: 1s) Voltage Measurement Accuracy: 2% (up to 2% of the total range) Rated Insulation Voltage: 400V Output Contact: 1NO Electrical Life: 100000 Times Mechanical Life: 1000000 Times Protective Level: IP20 Pollution Level: Level 3 Altitude: ≤2000m Operating Temperature: -50-55℃ Humidity: 50% at 40℃ (non condensing) Storage Temperature: -30-70℃. Package List: 1 x Voltage Transfer Switch 1 x User Manual