... -30KA selected Pole:1P,2P,3P,4P LV Grade C type withdrawable power surge arrester 1. Description: surge protection ... is suitable for TT, IT, TN-S, TN-C-S etc. power supply system of AC 50/60HZ, ... making, spare parts till finished products.3.Standard copper material and fully set inspection equipment to assue ... Best service after sale are provided. Grade C type autoprotected low voltage Surge arresters