Feature: 1. Surge Protection: When there is a surge overvoltage, this protector will turn on quickly within nanoseconds, introduce the surge overvoltage into the ground, protect the electrical equipment. 2. High Performance: The surge protector has quick response speed, strong carrying capacity, and will not affect the normal operation of the power grid. 3. Fault Indication: There is a working status indication window, green means normal, red means fault, which can effectively reflect the working status and facilitate timely replacement and maintenance. 4. High Safety: The surge protector is fire and corrosion resistance, adopts insulated terminal blocks, more reliable and safe, supports hot line operation and is easy to use. 5. Rail Installation: The surge protector is modularly designed and adopts 35mm electrical rail installation method, simple and convenient. Specification: Item Type: Surge Protective Device Material: PC Color: White Maximum Discharge Current (Imaximum): 40KA Nominal Discharge Current (In): 20KA Protection Level (up): 2p/3p: 1.8KV, 4p: 1.2KV Protection Class: IP20 Response Time: ≤25ns Maximum Wire Diameter: 35 hard wire or multi strand wire (mm²) Recommended Connection: 4-25 (mm²) Installation Method: 35mm electrical 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.. Package List: 1 x Surge Protective Device