Abstract: This paper addresses the challenges in safety, energy efficiency, and operation and maintenance of rail transit power distribution systems by proposing an integrated smart circuit breaker solution. By integrating five core modules—protection, metering, control, communication, and diagnostics—the solution builds a hardware platform with state-awareness and intelligent decision-making capabilities. Utilizing multi-protocol communication and embedded sensing technology, it enables real-time load monitoring, remote control, fault early warning, and energy efficiency management. Centered on three-level load management and low-voltage DC protection for rail transit, the solution demonstrates its platform value and applicability in constructing next-generation power distribution systems through validation in cultural tourism and other scenarios.