Feature: 1. AUTOMATIC PROTECTION FUNCTION: When the mains voltage exceeds or lower than the operating voltage value of the protector, the protector can quickly and reliably cut off the load power supply to protect electrical appliances and personal safety. When the mains voltage returns to normal, the protector automatically switches on the power supply and restores the power supply to achieve full automatic control 2. MAIN APPLICATION: Voltage protection relay is mainly used to protect line voltage instability, front end zero break, voltage entry, inductive thunder caused by voltage shock and other line voltage problems 3. SAFE MATERIAL: The voltage protection relay housing is made of flame retardant material, which is safe and durable for daily use 4. STABLE AND RELIABLE: The voltage protection relay is made of excellent electronic components, possess stable performance, and can effectively protect your home electricity safety 5. CLEAR DIGITAL DISPLAY: The self duplex over and under voltage protector is equipped with a digital display, the reading data is clear and easy to read, and can also be used as a voltmeter Specification: Item Type: Over Under Voltage Protector Material: PC Rated Voltage: 230VAC 50/60Hz Overvoltage Recovery Value: AC2705V Undervoltage Recovery Value: AC1705V Recovery Time: 60s Electrical Life: 100000 Times Mechanical life 1000000 Times Protection Level: IP20 Pollution Degree: 3 Altitude: Approx. 2000meter / 6561.68ft Operating Temperature: -50-55 Humidity: 50% at 40(non condensing) Humidity Temperature: -30~70 Installation: Approx. 35mm / 1.38in guide rail. Package List: 1 x Over Under Voltage Protector