Composite busbar for small power distribution controller

The invention discloses a composite busbar for a small power distribution controller, and the composite busbar comprises a U-shaped busbar unit, a U-shaped busbar combination which is arranged at one side of the U-shaped busbar unit and is matched with the structure of the U-shaped busbar unit, and at least two groups of fastening assemblies which are arranged between the U-shaped busbar unit and the U-shaped busbar combination. The U-shaped busbar combination comprises an L-shaped busbar unit which abuts against one side of the U-shaped busbar unit, and an I-shaped busbar unit which is arranged at an interval with the L-shaped busbar unit and is combined with the L-shaped busbar unit to form a U-shaped cross section. Each fastening assembly comprises at least two first ribbons arranged between the U-shaped bus bar unit and the L-shaped bus bar unit and at least one second ribbon arranged between the U-shaped bus bar unit and the I-shaped bus bar unit. According to the composite busbar for the small power dis