Multiple-breakpoint internal-connection DC circuit breaker

Provided is a multiple-breakpoint internal-connection DC circuit breaker which is mainly to solve the problems that for a conventional multiple-breakpoint internal-connection DC circuit breaker, series wiring is carried out at outer wiring terminals of the circuit breaker, and two poles or more poles of the circuit breaker are allowed to be connected in series to form series -connected breakpoints, so that the circuit breaker is not convenient for users to use, and the circuit breaker is large in occupation space. The multiple-breakpoint internal-connection DC circuit breaker is characterized in that the bottom portion of each fastening screw rod passes through a base and is provided with an adaptive fastener; the bottom portion of the base is provided with an installation cavity; a series-connection connection plate is arranged between the inner wall of the top portion of the installation cavity and the fastener; and the two ends of the series-connection connection plate are connected with the adjacent fastening screw rods respectively. According to the multiple-breakpoint internal-connection DC circuit breaker, by adopting the internal-connection mode, the bottom portions of the wiring terminals of the circuit breaker are connected through the series-connection connection plate, so that the two poles or more poles of the circuit breaker are allowed to be connected in series to form series-connected breakpoints, and the shape of a conductor for connection does not surpass the housing of the circuit breaker; and the circuit breaker is compact in structure, convenient to use, and small in occupation space.