The pole-mounted circuit breaker is a specialized pole-mounted protective switch adapted for use downstream of transformers in power distribution systems. Designed specifically for outdoor pole-mounted installations, it features a professional waterproof protection structure, effectively resisting the complex natural environment of outdoor elements such as wind, rain, humidity, and condensation. Its good waterproof performance ensures stable operation under various outdoor climatic conditions. This circuit breaker focuses on the core operational risks of the transformer's downstream lines, accurately monitoring circuit conditions and providing triple protection against short circuits, overloads, and three-phase imbalances. When these faults occur, it quickly disconnects the circuit, promptly cutting off the faulty loop and effectively preventing the fault from escalating and damaging the transformer and downstream electrical equipment, thus blocking potential electrical safety hazards. As a key protective device in outdoor power distribution, it provides robust protection for the safe, reliable, and continuous operation of the transformer's downstream power distribution lines, meeting the power distribution protection needs of various outdoor power infrastructure projects.