Description Item Type: Surge Protective Device Material: PC Color: White Maximum Discharge Current (Imaximum): 80KA Nominal Discharge Current (In): 40KA Protection Level (Up): 2.2KV Protection Grade: IP20 Response Time: 25ns Maximum Wire Diameter: 35 hard wire or stranded wire (mm2 Recommended Connection: 4-25 (mm2 Installation Method: 35mm electrical guide rail installation Ambient Temperature: -40 to +80 Main Structure and Working Principle: 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.