SPD LGS-40/4p-385 Surge protective Device 1.CE CCC 2. 380V 3. Also ... power supply system 50HZ/60HZ, under 380V , such as IT, TT, TN-S, TN-CS, meet the GB18802.1 ... in 35mm. Internally installed failure break off device, when the protect device failed to puncture because of overloading or over ... heating , failure break off device will work and cut off power supply automatically. The ...