Physically, a busbar is typically mounted inside an electrical enclosure (like a panel or busway housing) on insulators. Equipment such as circuit breakers, feeders, transformers, or battery terminals is bolted or clamped to the busbar, establishing an electrical connection. In simple terms, a busbar is a common node where multiple incoming and outgoing circuits connect. Where power converges and then. For the uninitiated, bus bars are robust conductive bars, often made of copper or aluminum, that effectively carry electricity within a switchboard, distribution board, substation, or other electrical equipment.