1The shell is made of PC flame retardant material, which has good fire resistance, high insulation, sturdiness and durability, and dustproof. 2Excellent performance, can be used to protect electrical systems and load electrical equipment from thunder and transient overvoltage. 3Simple to use, install household surge protector, guide rail installation, and it should be installed in distribution box or power distribution cabinet. 4Modular plugin design, easy maintenance, reusable base, reducing maintenance costs. 5Professional manufacturing, superb craftsman and high accuracy help to provide the best performance. Item Type: Surge Protective Arrester Material: PC Model: SEGLY-40kA 4P Protection Level: Second Grade Installation Conditions: DIN rail installation Installation Conditions: Installed in the distribution box and cabinet UC (Working Voltage): 385V In (Nominal Discharge Current): 20KA Imax (Maximum Discharge Current): 40KA Protection Level: UP(8/20s)2Kv Arc Extinguishing Medium: Air type Trip Method: Automatic Protection Type: Thunder protection Number of Poles: 4P Connection Method: Plug-in Indication Port:Green is normal state Red is the fault state Purpose: Install in electrical equipment to protect electrical systems from thunder and transient overvoltage. 1 x Surge Protective Arrester