Enclosed low-voltage bus system

The utility model relates to the technical field related to electric power, in particular to a closed low-voltage bus system, which comprises an A-phase main bus, a B-phase main bus and a C-phase main bus which are sequentially arranged, and further comprises a plurality of mounting bases which are arranged along the length directions of the A-phase main bus, the B-phase main bus and the C-phase main bus, a conductive column used for being connected with a circuit breaker is arranged on the mounting base, and two groups of mounting and connecting mechanisms are arranged between the circuit breaker and the mounting base; a group of first elastic fastening mechanisms connected with the B-phase main bus are arranged at the centers of the mounting plates, the arrangement work of the system is simplified through the arrangement of all the mechanisms and parts, and the arrangement work of the system is simplified through the first elastic fastening mechanisms, the second elastic fastening mechanisms and the mountin