The operating characteristics detection is an important part of the working performance detection of the residual current circuit breaker. Through the detection of the operating characteristics, the analysis and prediction of the performance of the residual current circuit breaker can be made based on the analysis of the change of the operating characteristic data. In this way, it can improve the performance deficiency, and improve the stability of the work. In order to meet the requirements of the detection of the residual current circuit breaker, an operating characteristics detector was designed in this paper. The operating characteristics detector mainly consists of industrial control machine, residual operating current generation module, current adjustment module, residual operating current detection module, actuating time detection module, automatic reset and closing module and so on. More importantly, it realizes the continuous, real-time, efficient and accurate measurement of the characteristics of the leakage circuit breaker.