Item Type: Surge Protector_x000D_ Material: PC_x000D_ Color: White_x000D_ Maximum Discharge Current (Imaximum): 20KA_x000D_ Nominal Discharge Current (In): 10KA_x000D_ Protection Level (Up): 1.5KV_x000D_ Protection Grade: IP20_x000D_ Response Time: 25ns_x000D_ Maximum Wire Diameter: 35 hard wire or stranded wire (mm2_x000D_ Recommended Connection: 4-25 (mm2_x000D_ Installation Method: 35mm electrical guide rail installation_x000D_ Ambient Temperature: - 40 to +80_x000D_ Main Structure and Working Principle:_x000D_ In a three phase four wire system, protectors are connected between three phase wires and one neutral wire to ground. Under normal circumstances, the protector is in a high resistance state, when the power grid deals with surge overvoltage due to lightning strike or other reasons, the protector will turn on quickly within nanoseconds, and introduces the voltage overvoltage into the ground, thus protecting the electrical equipment on power grid. When the surge voltage passes through the protector and disappears, the protector changes to a high resistance state again, so as not to affect the normal operation of the power grid.