SPD 1, used in the IT, TT, TN-C, TN-S 2,Up:AC385V;Imax:100kA;In:60kA 3.GB18802.1/ ... IEC61643-1 standards. 4,Protection Class B NKP-DY-I-100/385/4P SPD ... surge arrester /surge protector/surge protective device 100KA NKP Power SPD from KEJIA is usually be ... used in the IT, TT, TN-C, TN-S, TN-C-S and etc power ...