Item Type: Surge Protection Device_x000D_ Color: White_x000D_ Material: PC_x000D_ Maximum Discharge Current: 60KA_x000D_ Nominal Discharge Current: 30KA_x000D_ Protection Level: 2.0KV_x000D_ Shielding Grade: IP20_x000D_ Response Time: 25ns_x000D_ Maximum Wire Diameter: 35 hard wire or multi strand wire(mm2)_x000D_ Recommended Wire Connections: 4-25(mm2)_x000D_ Installation Method: 35mm electrical rail mounting_x000D_ Ambient Temperature: -40 to +80_x000D_ Main Structure and Operating Principle:_x000D_ In the three phase four wire system, three phase lines and a neutral wire to ground are connected between the protector. Under normal circumstances, the protector is in a high resistance state, when the power grid due to thunder or other reasons out of the reason surge overvoltage, the protector will be immediately in the nanosecond time quickly conductive, the voltage overvoltage into the earth, thus protecting the power equipment on the grid. When the surge voltage through the protector, and disappears after the protector revert to a high resistance state, so as not to affect the normal operation of the grid.