ZY2-B surge protective device (hereinafter refers to the"protector") applicable for TN-S, TN-C, TN-C-S, TT and IT power supply system with rating of 50/60HZ, 380VAC or below. It is used for isopotential connection in interface between LPZOA and LPZO1 or LPZOB and LPZ1 area in order to protect electric network from lightning or overvoltage operation. The products conform with GB 18802.1 and IEC 61643-1 standards. Model number specification Ordinal number Model number Pole IpeakkA QAs Uc(V) UpkV Ip(kA) 1 ZY2-B/30-2.5 1P 30 15 385 <2.5 4.5 2 ZY2-B/30-4.0 1P 30 15 385 <4.0 4.5 3 ZY2-B/60-2.5 1P 60 30 385 <2.5 6 4 ZY2-B/60-4.0 1P 60 30 385 <4.0 6