The busbar refers to the copper or aluminum busbar connecting the main switch in the electrical cabinet and the switches in each branch circuit in the power supply system. The surface is treated with insulation, mainly used for conducting wires.

The main power supply line of the distribution power supply device (copper and aluminum bars are called busbar), and each branch line (branch bar) is led from the busbar up and down.

Sometimes also known as busbar, it is the name of the conductive material on the power distribution equipment. The material is copper (equivalent to wires), without insulation layer, and is coated with color paint indicating phase sequence. It is mainly used for indoor transformers, distribution cabinets, power supply main switches, and then connected to each switch.