Abstract: As an action trigger mechanism, the mechanical performance of the opening accessory is very important for the reliable operation of conventional circuit breaker. Aiming at its life prediction, a life prediction method based on binary Wiener performance degradation analysis is proposed. Combining the working mechanism of the opening accessory, the method adopts the vibro-electrical joint analysis mode. First, CEEMDAN-WD and double-threshold method based on short-term energy entropy ratio are used to realize the accurate calibration of the vibration events for the specific actions in the triggering stage of the opening process. Then, the time and driving energy parameters of the mechanism action corresponding to the vibration event are used as the performance degradation index. On this basis, a binary Wiener model is constructed with the vibro-electrical joint analysis index as the input of the prediction model, and the quantitative prediction of the remaining life is realized finally. The tests on three circuit breakers show that the life prediction method based on vibro-electrical synergistic analysis has higher prediction accuracy. The average relative errors of the three test products are 4.3%, 9.77%, and 8.46%, respectively, which has engineering practicality.