The utility model discloses a free tripping mechanism applied to a circuit breaker, a separation switch or a load switch. The tripping device of the free tripping mechanism comprises an overload tripping device and/or a short circuit tripping device. The free tripping mechanism further comprises a bracket for mounting an actuating mechanism, a locking buckle and a jump buckle; a re-buckling plate used for realizing two-level transmission between the tripping device and the locking buckle is mounted on the bracket; a pair of support frames, a traction board for coordinating the work of the tripping device, a retainer for preventing the re-buckling plate from transitionally rotating when the tripping is switched out and a positioning claw for controlling the depth of the locking buckle are extended from the re-buckling plate which adopts a transitional surface as a base; the contact surface of the shaft hole of the re-buckling plate and the locking buckle is on the support frames; and a bending angle Alfa of 120 DEG to 150 DEG is formed by the traction board and the transitional surface. The tripping transmission chain of the utility model is reduced, the two-level transmission tripping between the tripping device and the locking buckle is realized, the disjunction time is reduced, and the cost is reduced. In addition, the re-buckling plate has a simple and compact structure and the mounting position thereof is flexible, so that the stable and reliable operation of the tripping mechanism is ensured.