Feature: 1. Sturdy And Robust: This 3 phase voltage protector is made of high strength flame retardant material, which is sturdy and robust and not easy to burn, ensuring the safety of use. 2. Clear Digital Display: The digital display shows the voltage status in real time, and the voltage display is clear at a glance. Complete panel keys, easy to operate, easy to use. 3. Safe to Use: When the voltage is too high or too low, automatically disconnect the load side of the power supply to prevent electrical appliances from burning, to protect the safety of electricity. 4. Easy Installation: This 3 phase protector is installed by DIN rail, which is simple and easy to operate, and is stable and firm after installation. 5. Applicable Equipment: Mainly used in home and shopping mall power distribution lines as over voltage, under voltage, phase breakage, neutral line breakage guard. Specification: Material: ABS Rated Voltage: 220V Operating Voltage Range: AC140V~300V Rated Frequency: 50Hz/ 60Hz Electrical Life: ≥100,000 cycles Humidity: ≤50% at 40℃ (non condensing) Operation Delay: 0.1S~30S (default: 1S) Wiring Method: Lower inlet and upper outlet Continuous Overcurrent Times: 0-20 times, default off Rated Insulation Voltage: 450V Storage Temperature: -25℃~55℃ Operating Temperature: -5℃~40℃ Altitude: ≤2000m Pollution Level: 3 Guard Level: IP20 Output Contact: 1 NO Item Size: 90 x 91 x 65mm / 3.54 x 3.58 x 2.56in Package List: 1 x 3 Phase Undervoltage Protector 1 x User Manual (English)