Abstract: It is necessary to debug the relay protection device and carry out transmission test with circuit breakers in the maintenance, putting into production, technical transformation and other power engineering of substation. Transmission test must be carried out in combination with blackouts, and the length of test time directly affects the time to restore power supply. In order to ensure the equipment to restore power supply on time and improve the reliability of power supply, a multiple circuit breakers combined control device is developed. By optimizing the test connection, it realizes the function of controlling multiple circuit breakers at the same time and satisfies the local operation. After application, the transmission test time of circuit breakers is effectively shortened, the range of activity is reduced, and the operation safety is improved. It has a wide range of practical application prospects.