The 27.5kV intelligent circuit breaker (cabinet) is used for power distribution and electrical circuit breaking in traction substations, subdivision stations and opening and closing stations, and is indoor type equipment; the built-in circuit breaker adopts air insulation and vacuum interrupting working mode, which is suitable for high current and high frequency breaking application scenarios. The 27.5kV intelligent circuit breaker (cabinet) is equipped with a variety of sensors to monitor the mechanical and electrical characteristics of the switch, with video monitoring, arc protection, temperature monitoring and local discharge monitoring to achieve comprehensive state awareness, accident prediction and fault warning.