GB18802.1-2002 and IEC61643-1: 1998 technical standards LGS9-B series of surge protectors suitable for AC power supply system 50HZ/60HZ, under 380V , such as IT, TT, TN-S, TN-CS, meet the GB18802.1-2002 and IEC61643-1: 1998 technical standards, design installation of electric rail in 35mm. Internally installed failure break off device, when the protect device failed to puncture because of ...