Modularized multi-pole circuit breaker and use method

The invention relates to the technical field of circuit breakers, in particular to a modular multi-pole circuit breaker and a using method, the modular multi-pole circuit breaker comprises a first circuit breaker, a second circuit breaker and a third circuit breaker, the third circuit breaker is inserted into the side end of the first circuit breaker in a limiting manner, and the second circuit breaker is inserted into the side end of the third circuit breaker in a limiting manner; the first circuit breaker comprises a circuit breaking structure, an adaptive groove frame and a first insulating plate, the right side of the circuit breaking structure is fixedly connected with the first insulating plate, the right side of the first insulating plate is fixedly connected with the adaptive groove frame, the center of the front end of the adaptive groove frame is fixedly connected with a limiting block, and the center of the limiting block is provided with a first adsorption magnet; the first circuit breaker further