As power systems develop toward higher voltage and larger capacity

the new-generation power systems impose higher requirements on the arc erosion resistance of copper-tungsten (CuW) electrical contacts. Graphene (Gr)

owing to its exceptional properties

is often employed as a reinforcing phase in composite materials and can be applied to modify circuit breaker contacts. In this study

a mesoscale (10-3~10-9 m) cellular automaton (CA) model for arc erosion of graphene-doped CuW80 (with 80% W) is developed

incorporating temperature-dependent material properties and boundary movement during the erosion process. The model can simulate the temperature field and the morphology of molten craters during melting

and is used to investigate the influence of graphene content and spatial distribution on the erosion characteristics of CuW80. Based on the state and quantity of material cells

evaluation metrics such as erosion rate and complete erosion heat flux are proposed to explore the reinforcement mechanism of graphene. Compared with CuW80

the Gr-doped CuW with 0.16% Gr (Gr-0.16/CuW80) exhibites an reduction of 8.068% in erosion rate and a increase of 4.302% in complete erosion heat flux. The reinforcement effect is most pronounced when graphene has sufficient contact area and thermal pathways with the heat source

which enhances internal heat transfer efficiency and reduces interfacial material loss. The CA simulation method provides a foundation for multi-scale modeling of CuW contacts and offers design guidance to enhance contact performance.