... Combination arrestor, protection set for TT, TN and IT system MOV, Pluggable,Modular design IEC61643-1 1pc/pkg Combination arrestor, protection set for ... TT, TN and IT system· DGM-type surge protector( ... exceeding 1000V(RMS),200/380V,50/60Hz power supply system,not exceeding 1500V DC voltage of the circuit and ...