... , TN-C-S,TT,IT etc. power supply system 2.1,2,3,4(+NPE) 3.IEC61643-1,GB18802.1 Product Features1 ... ;3.Smallness leak current, response quickly, less residual voltage;4.Signal indication device, green(normal), red(abnormal);5.Highly energy, clearance discharge ... -PE). Application Scope and Installation PositionLY2-C series surge protective device according to GB18802.1-2002, installed on the joint of ...