Features MULTI-FUNCTION Our current protection device has reset mode selection, fault query, and factory restore function. Secondary Protection: Our over-voltage protection device can prevent frequent switching on and off of unstable voltage from causing additional damage to the appliance and achieve secondary protection. Voltage Display This over-voltage protection device has over voltage protection, low voltage protection and voltage display function (voltage measurement). Manual adjustment: To provide safety protection to electrical appliances (not included) or other devices, you can manually adjust the over-voltage, undervoltage, and over-current protection values. Flame Retardant PC: Our over-voltage protection device is made of flame retardant PC material with exquisite craftsmanship, which can achieve long-term use. Specification: Item Type: Voltage Protection Device Material: flame retardant PC Current: 1-40A Surge Protection Value Range (Grape): 240V-300V Low Voltage Protection Value Range (uve): 140V-210V Shutdown delay time: 2s (can be set from 1 to 300s) Auto-recovery protection delay time: 30s (can be set from 1 to 300 s) Rated frequency: 50 or 60 Hz Error: 2% Voltage measurement accuracy: 1% Rated insulation voltage: 400V Output Contact: 1No Electrical life: 100000 times Mechanical life 1000000 times Degree of protection: IP20. Altitude: ≤2000m Working temperature: -50℃-55℃ Humidity: ≤50% at 40°C (non-condensing) Humidity temperature: -30℃-70℃ Package List: 1 x Voltage Protection Device Package List 1 x Voltage Protective Device