The application of circuit breakers in the field of infrastructure is a core element in ensuring the safe and stable operation of power systems, covering key scenarios such as transportation, municipal services, communication, and healthcare. Its core functions include short circuit protection, overload protection, system segmentation control, etc., which need to adapt to complex environments and high reliability requirements. It is developing towards intelligence, high environmental adaptability, and integrated protection in the field of infrastructure, becoming the "cornerstone of power safety" for the construction of new smart cities.