What are the functions of the small busbar at the top of the cabinet
The busbar's material composition and cross-sectional size determine the maximum current it can safely carry. use very large busbars to carry tens of thousands of to the that A busbar's main function is to conduct and distribute large electrical currents from one source to multiple circuits within an enclosure, acting as a central, high-capacity connection point. A busbar is a metallic strip or bar (usually made of copper or aluminum) used for conducting electricity within a switchboard, distribution board, substation, or other electrical apparatus.
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