Abstract: A miniature circuit breaker with an automatic opening/closing function, comprising a circuit breaker body and an automatic opening/closing driving mechanism; the body comprises circuit breakers, each comprising a plastic housing, an opening/closing handle and a manipulation mechanism; a spindle hole is at the rotation center of each handle; the driving mechanism comprises a case, a driving motor with a driving turbine, a linkage turbine, a linkage gear, an output spindle and a release linkage member; the driving motor drives the linkage turbine for reciprocating rotation via the driving turbine, and the linkage turbine drives the release linkage member for reciprocating rotation within a preset angle range via a cam linkage so that a lever of the release linkage member prods an opening release linkage rod to perform a rapid opening action; the linkage turbine drives the linkage gear and the output spindle to do synchronous rotation via driving teeth.

Abstract: A linkage worm gear for an automatic opening/closing driving mechanism, wherein the linkage worm gear is integrally and concentrically provided with a worm gear driven portion, a gear driving portion and a cam linkage portion successively in the direction of the rotation central axis thereof; worm gear teeth fitted with a driving worm gear are provided on the whole peripheral wall of the worm gear driven portion; a reset groove, a recess, a transition portion and a boss are successively provided on the periphery of the cam linkage portion; and a plurality of driving teeth are provided on part of the peripheral wall of the gear driving portion.