White Distribution Box Surge Protection Device IP20 Safe Simple Combiner Box Voltage Surge Arrester 60KA 2P 275V Item Type: Surge Protection Device Color: White Material: PC Maximum Discharge Current: 60KA Nominal Discharge Current: 30KA Protection Level: 2.0KV Shielding Grade: IP20 Response Time: ≤25ns Maximum Wire Diameter: 35 hard wire or multi strand wire(mm²) Recommended Wire Connections: 4-25(mm²) Installation Method: 35mm electrical rail mounting Ambient Temperature: -40℃ to +80℃ Main Structure and Operating Principle: 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.