... , Pluggable,Modular design IEC61643-1 1pc/pkg Combination arrestor, protection set for TT, TN and IT system· DGM-type surge protector ... passed CE Certification and the national test Room:Beijing Lightning Experimental Device Type Detection Center 1. More photos 2.Technology parameter ... toTT,TN,IT systemMounting on35mm Din rail Combination arrestor, protection set for TT, TN and IT system