Primary and secondary fusion pole-mounted circuit breaker

The invention relates to the technical field of pole-mounted circuit breakers, and provides a primary and secondary fusion pole-mounted circuit breaker, which comprises a mounting mechanism, an adjusting mechanism is fixedly mounted on the right side of the inner middle part of the mounting mechanism, a control mechanism is fixedly mounted on the inner middle part of the mounting mechanism, and a limiting mechanism is fixedly mounted on the inner front side of the mounting mechanism. Driving mechanisms are uniformly distributed on the rear side of the inner middle part of the mounting mechanism, and a knife switch mechanism is fixedly mounted at the rear end of the circuit breaker main body. When opening is started, people can move the periphery of the upper end of the lower connector downwards from the lower end of the upper connector preliminarily, the situation that opening cannot be achieved due to adhesion of the lower connector and the upper connector is avoided, the follow-up opening speed can be incre