The design of communication module for intelligent circuit breaker based on the DeviceNet protocol is suggested according to the technical demands of intelligent low voltage circuit breaker with communication capability. The form of networking and mechanisms of DeviceNet communication, as well as DeviceNet protocol stack software implementation are expounded. The power circuit, DeviceNet interface circuit, the interoperability test interface and the result of inrush current test of conformance test are also presented. The module is effective to achieve the long-distance communications and the centralized monitoring.