Closed combined low-voltage bus system

The utility model relates to the technical field of buses, in particular to a closed combined low-voltage bus system, which is mounted in an outer shell and comprises a bus and a circuit breaker. The first mounting plate is arranged on a plurality of first transverse shafts fixed in the outer shell in a sliding mode, and the first mounting plate is connected with an elastic structure arranged on the second mounting plate; the pushing mechanism comprises a two-way traction assembly and a jacking and stretching assembly which are arranged in a linkage mode, the two-way traction assembly can drive the first mounting plate to move in the length direction of the first transverse shaft, and when the first mounting plate moves in the length direction of the first transverse shaft, the jacking and stretching assembly can drive the second mounting plate to move relative to the first mounting plate; the side plate is connected with a convex shaft arranged on the circuit breaker; and the elastic deflection assembly is r