Branch switch assembly for direct-current circuit breaker

The invention relates to a branch switch assembly for a DC circuit breaker. The branch switch assembly comprises an assembly frame which is provided with an IGBT valve segment and a main loop diode valve segment, and is also provided with a power supply unit. The main loop diodes are conductively connected through conductive connection structures to form corresponding branch switch circuits, the corresponding IGBT units and the corresponding main loop diodes are conductively connected through conductive connection structures to form corresponding branch switch circuits, each conductive connection structure comprises a plurality of laminated busbars arranged below the IGBT valve sections and the main loop diode valve sections, and conductive connection parts are arranged on the main loop diode valve sections and the IGBT valve sections. Each laminated busbar is correspondingly and conductively connected with the conductive connecting part. The laminated busbar is arranged below the mainloop diode valve section