The invention belongs to the field of power distribution network current switches, in particular to a circuit breaker for power distribution. The main functions of the circuit breaker of the inventionare achieved by making full use of a permanent magnet drive structure, so that the structure of the circuit breaker is simplified, the number of parts is reduced, the complexity is reduced, the stability of the circuit breaker is improved, and the manufacturing cost is reduced. Through electromagnetic control and circuit control systems, adaptive control and self-regulation of the position relationship between the static and moving contacts of the circuit breaker and the control factors of opening/closing operation are realized. When the structure and control factors of the stable state of the circuit breaker are changed during use because of the wear between the contacts or other reasons, adjustment and change can be made immediately. Therefore, the functions of the circuit breaker willstill be complete and effective after the circuit breaker is used for a long time.