... 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 ... service after sale are provided. Grade D protected power surge protective device