Protection against overloads and circuit short in electric lines.Rated voltage up to 80V DC or 50Hz 130V AC, Rated current up to 800A.This series of Null line fuse can be equipped with RT18 series of fuse holders/bases and DR series of fuse disconnecting switches for usage, e.g. it can be combined freely into RT18-32 3P+N structures, etc. or combined as customer`s requirements.The models, dimensions, ratings are shown in Figures 14.2-14.7 and Tables 14.