Controller of circuit breaker and control method thereof

The invention discloses a control method for a controller of a circuit breaker. The control method comprises: step one, carrying out data reading and signal detection; to be specific, reading data from a quick reading memory and detecting an MCR/HSISC state signal by an MCR/HSISC detection circuit; step two, carrying out function selection; to be specific, selecting whether to perform an MCR function or an HSISC function based on determination of existence of hopping of an MCR/HSISC signal; and step three, performing the MCR function or the HSISC function; to be specific, meeting a performing condition and implementing releasing to end the process; and ending the process on the condition of meeting a termination condition. In addition, the invention also provides a controller for realizing the control method. According to the invention, the MCR/HSISC function is realized by software and thus the controller and the control method have advantages in terms of implementation cost and detection stability; and the controller has MCR/HSISC detection circuit and the fast reading and writing memory circuit, thereby realizing fast starting of the controller and quick writing in before power loss.