The IoT circuit breaker is based on the basic functions of traditional circuit breakers such as small circuit breakers (MCB) or Residual Current Breaker with Over-Current (RCBO) (including overload, short circuit, leakage and other protection functions), and is equipped with processor detection, electric actuators and communication application technologies to achieve wireless monitoring and support big data applications. It has become one of the smart terminal protection switch electrical appliances in the construction of the Internet of Things and smart grid.