Marine circuit breaker is an essential basic device in power system of ship

and its performance under the dynamic shock load is directly related to the safety of the entire power system of the ship. For studying the factors affecting the shock resistance of circuit breaker

the circuit breaker model is set up in this paper

and the dynamics design analysis method (DDAM) and the time domain analysis method are used for simulation and study. The design is optimized for the insufficient structural strength and verified by the shock test. The conclusions and methods obtained provide references for further improving the shock resistance of the circuit breaker.