20KA 3P+N 4P Surge Protective Device SPD 1.Item:20KA 3P+N 4P 2.Uc-420V ... less than 1.5KV 20KA 3P+N 4P Surge Protective Device SPD More other Feature:Modeule design, convenient installation, with easyelectric ... Red failureInstallation35mm²DIN railProduct application and installation position Surge Protective Device used to find equipotential connection, installed on LPZ1, LPZ2 area ...