Features Voltage Display: This protective device features voltage display, providing overvoltage and undervoltage protection, and allowing for precise voltage measurement. Manual Adjustment: Safeguard electrical appliances by manually adjusting overvoltage, undervoltage, and overcurrent protection values, ensuring tailored security. Multifunction: Equipped with reset mode selection, fault inquiry, and restore factory function, this device offers versatile protection capabilities. Secondary Protection: Prevent additional appliance damage from unstable voltage fluctuations with the ability to achieve secondary protection through this device. Flame Retardant PC: Crafted from flame retardant PC material, this protective device ensures long-term use and safety, making it a reliable choice for protection against voltage fluctuations. Specification: Item Type: Voltage Protective Device Material: Flame Retardant PC Current: 1-40A Overvoltage Protection Value Range(uvo): 240V-300V Undervoltage Protection Value Range(uve): 140V-210V Shutdown Delay Time: 2s (can be set 1-300s) Self Recovery Protection Delay Time: 30s (can be set 1-300s) Rated Frequency: 50 or 60Hz Error: 2% Voltage Measurement Accuracy: 1% Rated Insulation Voltage: 400V Output Contact: 1No Electrical Life: 100000 times Mechanical Life 1000000 times Protection Grade: IP20 Altitude: ≤2000m Working Temperature: -50℃-55℃ Humidity: ≤50% at 40℃ (non condensing) Humidity Temperature: -30℃-70℃ Package List: 1 x Voltage Protective Device Package List 1 x Voltage Protective Device