bus bar frame is the basic element of bus bar system, may be ... or 10mm-length rectangular busbar, double-T Universal bus bar frame , , is used for bus bar of 12,15,20,25 ... ,3*5/10UL- bus bar frame, is used for busbar of 12,2,30*5/10 ... for 12,15,20,25,30*5/10Bus bar frame with connection terminal , is used for 12,15,20,25,30*5 ...