Plug-in circuit breaker

A plug-in circuit breaker comprising a housing, an operating mechanism and a button mechanism, the button mechanism actuates said operating mechanism to perform the closing/opening operation, and has a closing position and an opening position corresponding to closing/opening states of the circuit breaker, wherein the circuit breaker further includes a locking member and a linkage member arranged inside said housing, said linkage member is provided with an abutting protruding stand, said locking member is provided with a locking protruding stand;

• when said button mechanism is in the closing position, said abutting protruding stand of said linkage member extends out of said housing and is limited by said button mechanism at an extension position, so that it cannot retract into said housing;
• when said button mechanism is in the opening position, said linkage member retracts into said housing, said locking protruding stand of said locking member extends out of said housing, and said locking protruding stand of said locking member can be pushed back into said housing under the action of an external force for retraction,
• wherein when said button mechanism is in the opening position, said locking protruding stand of said locking member retracts into said housing under the action of the external force for retraction, thus said locking member abuts and fits with said button mechanism to hinder said button mechanism from switching from the opening position to the closing position.