In response to the problems of high cost and excessive fault current under fault conditions in existing hybrid DC circuit breaker topologies, this paper proposes an improved current limiting DC circuit breaker topology based on the existing traditional DC circuit breaker topology. The current?limiting branch of the topology was connected to the circuit after the fault occured, effectively limiting the rise of fault current. The transfer branch consisted of thyristor and IGBT in series to reduce the number of IGBT.A pre?charged capacitor was used to provide the reverse voltage for the thyristor, and a pre?charged scheme was proposed. The operation principle was analyzed based on the proposed topology, and then the parameters were designed. Finally, a simulation model was built in PSCAD/EMTDC, compared with the breaker with traditional topology, to verify the reliability and economy of the proposed topology.