The LW35-252 self-sustaining SF6 circuit breaker is used for splitting and merging rated current, breaking fault currents, or switching lines to achieve control and protection of transmission lines. This circuit breaker can perform single-pole opening, closing, and fast automatic reclosing, as well as electrical linkage between three poles. It adopts a self-induced arc extinguishing principle, requires low operating power, meets the requirements for use at altitudes of 2500m, has an annual leakage rate of less than 0.3%, is suitable for seismic intensity levels of nine degrees, has high mechanical reliability, and a mechanical lifespan of up to 10,000 cycles.