Feature: 1. Appliances Protection: This device could prevent your electrical appliances from additional damage due to frequent switching on and off by unstable voltage, achieving secondary protection. 2. High Safety: Built in overvoltage protection and undervoltage protection, this voltage protective device is safer and more reliable to use. 3. Value Adjustable: The overvoltage, undervoltage and overcurrent protection values can be manually adjusted according to your needs. 4. Voltage Display: The protective device is equipped with a clear screen, so you can see the voltage value clearly and intuitively, and adjust it, more convenient. 5. Multi Functions: This voltage protective device has the functions of reset mode selection, fault query, and factory reset. Specification: Item Type: Over Under Voltage Protector Material: PC flame retardant Current: 1-63A Over Voltage Protection Value Range (uvo): 240-300V Under Voltage Protection Value Range (uve): 140-210V Shutdown Delay Time: 2s (1-300s can be set) Self Recovery Protection Delay Time: 30s (1-300s can be set) Rated Frequency: 50/60Hz Error: 2% Voltage Measurement Accuracy: 1% Rated Insulation Voltage: 400V Output Contact: 1No Electric Life: 100000 times Mechanical Life: 1000000 times Protection Grade: IP20 Altitude: ≤2000m Operating Temperature -50℃ to 55℃ Humidity: ≤50% at 40℃ (non condensing) Humidity Temperature: -30℃ to 70℃. Package List: 1 x Over Under Voltage Protector