The Galaxy-CAS temperature and humidity sensors are applied in circuit breakers, which can accurately monitor the temperature of key parts such as contacts and busbar connection points with their high-precision characteristics. By setting humidity thresholds, they can achieve fault warning and protection, and can also work stably in complex electromagnetic environments to improve system reliability. In some circuit breakers, temperature and humidity sensors are also used to monitor condensation caused by instantaneous temperature differences, in order to prevent damage to electrical insulation strength or accelerated corrosion of metal conduits due to high humidity.