The overhead busbar also includes a 220V DC busbar (voltage sourced from the DC panel, providing DC power for circuit breakers, integrated protection, and other equipment) and a 220V AC busbar (voltage also sourced from the AC output of the DC panel, providing AC. The overhead busbar also includes a 220V DC busbar (voltage sourced from the DC panel, providing DC power for circuit breakers, integrated protection, and other equipment) and a 220V AC busbar (voltage also sourced from the AC output of the DC panel, providing AC. A bus bar (also spelled busbar) is a metallic strip or bar used in electrical power distribution to conduct electricity within a switchboard, distribution board, substation, or other electrical apparatus. Its primary role is to carry large current loads and connect multiple circuits together. Think. While legacy power distribution systems come with a variety of liabilities and challenges, busbar systems alleviate these pain points in panel design, engineering, and operation through elevated customization and unique design capabilities. They are also used to connect high voltage equipment at. The PT cabinet, also known as the busbar voltage transformer cabinet or voltage transformer cabinet, typically houses a set of voltage transformers, a circuit breaker, surge arresters, and other primary electrical components. The circuit breaker's fuse provides protection for the voltage. Busbars carry power from the transformer to the low-voltage switchgear—in other words, the switches, fuses or circuit breakers that control, protect and isolate the electrical equipment.