... Protector:1.CCC,CE appliant;2.Products overview:GBL series surge protector is applicable to TT,IT,TN-S,TN- ... C-S power-supply system of AC 50 HZ or 60HZ,rated voltage up to 380V ... -61643-1,GB50057-94(2000 VERSION);3.Scope of application:GBL series surge protector is applicable to TT,IT,TN-S,TN ... -C-S power-supply system of AC 50 HZ or ...