A fast and non-arc fault break can be realized by combining the advantages of both static characteristics of integrated mechanical switches and the dynamic characteristics of power electronic switches. Based on this concept, a new type of topological structure of high-speed mechanical switches and bidirectional integrated thyristor assembly has thus been proposed. By analyzing the working principles of hybrid DC circuit breakers, this paper seeks to establish an experimental simulation model in environment. The simulation results show that the proposed circuit breaker can realize a non-arc break of the circuit breaker at zero voltage with a quicker speed than that of traditional DC circuit breakers. After the fault removal, the circuit can effectively suppress the rising rate of over-voltage and fault current.