JM3LZ series intelligent residual current protection circuit breaker (hereinafter referred to as circuit breaker) is a new generation of integrated high-tech products developed and produced by our company. It has a number of national patents and meets various intelligent requirements of State Grid Management. The preferred product to run. It is a multifunctional integrated circuit breaker integrating residual current relay and molded case circuit breaker with various functional accessories. The molded case circuit breaker is the main switch, with high breaking capacity and accurate breaking time. The integrated power distribution comprehensive protection circuit breaker has the advantages of small size, convenient installation and use, fixed and adjustable action value, easy operation, and can be adapted to users in various places, various environments, and can be set as needed. The products of the communication type series use the RS-485 communication port, which can establish communication function with the computer, and realize the functions of remote parameter adjustment, information inquiry and downloading of fault parameters.