Grade D proteced power surge protective device Amp: 5-10KA,10-20 KA selected Pole: 1P,2P,3P,4P Glade D type surge protective device 1. Description:Surge protection device (SPD, surge protector, surge arrester) is suitable for TT, IT, TN-S, TN-C-S etc. power supply system of AC 50/60HZ, installed on the joint of LPZ1 or LPZ2 and LPZ3, designed according to IEC61643, GB18802. It adopts 35mm ...