In the process of a short-circuit fault in a 2P DC 2000 V low-voltage DC circuit breaker, the large electric repulsion between the moving and stationary contacts can cause the contacts to bounce. The bouncing process generates a DC arc and burns the contacts, thus affecting the working performance of the circuit breaker. To avoid direct current arc erosion of contacts and circuit breakers caused by the repulsion between moving and stationary contacts. This article uses SolidWorks 3D modeling software to model the contact system, and uses Ansoft Maxwell software to simulate and optimize the electric repulsion force experienced by the contact system of a universal circuit breaker under short-term withstand current. The experimental research results show that the electric repulsion force is related to factors such as the type and thickness of the contact plate material, as well as the distance between the plate and the outermost contact piece. In order to better study the impact of contact systems on the short-term tolerance of circuit breakers, other factors of the contact system were further analyzed based on this, providing reference for the design of subsequent circuit breaker contact systems.