Grade C type autoprotected low voltage surge arresters. Amp:20-40KA, 15-30KA selected Pole:1P,2P,3P, ... Grade C type withdrawable power surge arrester 1. Description: surge protection device (SPD, surge protector, surge arrester) is suitable for TT, IT, TN-S, TN ... factory of disconnector switch & fuse switch disconnector & changeover switch etc. for more than 20 years.2.Provide OEM, ODM service, owning ...