1,it's designed according to IEC-185 2,suit for TN-S TN-C-S TT IT etc. 3,a failure release mounted on the module 80KA Power Surge Protective Device Specification: IntroductionCLY2-385/80 series of surge protect device (SPD) is suit for TN-S,TN-C-S,TT,IT etc. power supply system of AC 50/60 Hz.≤380V,and used at the equipotential connection, which protects the electric network not shocked by the ...