Magnetic actuating mechanism and circuit breaker

The magnetic action mechanism comprises a movable iron core, a coil assembly, a movable contact assembly, a static contact assembly, an elastic piece and a rotatable transmission shaft, the movable contact assembly and the static contact assembly are matched with each other, the movable contact is in linkage connection with the movable iron core and is in linkage connection with one end of the transmission shaft, a rotating shaft used for rotating installation is arranged in the middle of the transmission shaft, and the other end of the transmission shaft is connected with the elastic piece. When the coil assembly is powered on, the movable iron core acts under the action of magnetic attraction force, the movable contact and the static contact assembly are driven to be closed, and the transmission shaft is synchronously driven to enable the elastic piece to store energy. And after the coil assembly is powered off, the elastic piece releases energy and restores, so that the transmission shaft drives the moving