This device mainly tests the mechanical and electrical life of external circuit breakers, as well as the mechanical and electrical life of load switches. The independent control system of the upper computer is used to achieve automatic control of the test product. During the testing process, fully automatic control technology is used, which can complete the statistical summary of test times, statistical judgment of tripping and closing time, adjustment of load power and power factor, and output of test results Secondly; The composition of the device is assembled in a box style. The control part includes a computer with one box, a circuit breaker operation cabinet with six workstations with two boxes, and a load device with one box. A total of four boxes are connected together, and electrical and mechanical connections are made internally. The box is made of high-quality sheet metal and square joint welded, sealed with sheet metal baking paint, and the door is made of transparent organic glass for observation and testing of the product. Using a computer and a programmable controller PLC as the main control unit, the cylinder is used as the driving force to open and close the circuit breaker; For automatic opening and closing circuit breakers, this machine provides DC and AC power supply to the circuit breaker, and achieves the effect of controlling the opening and closing of the circuit breaker by controlling the power supply