Overview of the surge protector based on national standards GB / T18802.21-2004 / IEC61643-21: 2000 design. 2. Features of the product is suitable for power, control signals, video signals into one signal and power monitoring system over-voltage protection, over-voltage sensing from it, and over-voltage damage caused by electrostatic discharge; multistage protection, flow capacity, limiting low voltage, fast response time, low insertion loss and so on. 3. The use of ambient temperature: -40 ℃ ~ 70 ℃; Relative humidity: ≤95%; atm:. 70kPa ~ 106 kPa 4. surge protector works in series with the front-end equipment to be protected, when the transmission line was lightning and other transient over-voltage shock when, the impact of current through the surge protector to protect the branch to vent into the earth, and the output voltage clamp within the allowable voltage range of equipment to ensure the safe operation of the equipment. Lightning