Copper Steel Collector Bar is a copper inlay that is rounded and square in cross-section. This has been favoured for the CVD reduction because it gives less electrical resistance than traditional steel collector bars. A successful method of enhancing the Hall-Heroult process is the inclusion of copper inlays in steel collector bars. It assists in lowering the concentrated energy. The cathode voltage drop (CVD) and horizontal currents in the cell are both lessened by the copper insert collector bar (CuCB).