Circuit breakers are widely used in the fields of industrial and civil construction, and are the core components that ensure safety in electrical systems, providing reliable guarantees for the stable and reliable operation of power supply and distribution systems. Its main functions include circuit protection, control of on/off, and prevention of electrical fires. The reasonable selection and installation of circuit breakers in industrial and civil construction are directly related to the safety and reliability of electrical systems, and need to be designed based on specific load characteristics, environmental conditions, and regulatory requirements.