LW36-126/145 is a combined apparatus including an SF6 live tank circuit breaker with self-blast arc extinction technology.The circuit breakers are available for single or three pole operation,It is used to break rated current, fault current, or to switch electric lines, and thus realizes the controlling and protection of power system. It is capable of regular operation and also can be used as connecting circuit breaker.The new spring operating mechanism ensure high reliability and safety.