An overspeed protection switch for an overspeed governor assembly, the overspeed protection switch comprising: a trigger member, which is in an untriggered position when the overspeed governor assembly is in normal operation, and which is capable of rotating to a triggered position from the untriggered position when being toggled by a centrifugal mechanism of the overspeed governor assembly in case of overspeed of the overspeed governor assembly; at least one protrusion (23, 24) connected to the trigger member and rotating together with the trigger member; a reset lever which is rotatable along an axial axis from an idle position to act on one of the at least one protrusion (23, 24) to drive the trigger member to return to the untriggered position from the triggered position; and an actuation device which, in response to a reset command, acts on the reset lever to rotate the reset lever; wherein the actuation device comprises: an actuator having an action end capable of performing a linear reciprocating movement; a link mechanism (292, 293), via which the actuator is connected to a pivot shaft (28, 294); and the pivot shaft (28, 294) connected to the reset lever, wherein the pivot shaft (28, 294) rotates when driven by the actuator so as to drive the reset lever to rotate; characterized in that the link mechanism (292, 293) comprises: a first link, a first end of the first link being pivotally connected to the action end of the actuator, and a second end of the first link being pivotally connected to a first end of a second link; and the second link, a second end of the second link being drivingly connected to the pivot shaft (28, 294). a trigger member, which is in an untriggered position when the overspeed governor assembly is in normal operation, and which is capable of rotating to a triggered position from the untriggered position when being toggled by a centrifugal mechanism of the overspeed governor assembly in case of overspeed of the overspeed governor assembly; at least one protrusion (23, 24) connected to the trigger member and rotating together with the trigger member; a reset lever which is rotatable along an axial axis from an idle position to act on one of the at least one protrusion (23, 24) to drive the trigger member to return to the untriggered position from the triggered position; and an actuation device which, in response to a reset command, acts on the reset lever to rotate the reset lever; wherein the actuation device comprises: an actuator having an action end capable of performing a linear reciprocating movement; a link mechanism (292, 293), via which the actuator is connected to a pivot shaft (28, 294); and the pivot shaft (28, 294) connected to the reset lever, wherein the pivot shaft (28, 294) rotates when driven by the actuator so as to drive the reset lever to rotate; characterized in that the link mechanism (292, 293) comprises: a first link, a first end of the first link being pivotally connected to the action end of the actuator, and a second end of the first link being pivotally connected to a first end of a second link; and the second link, a second end of the second link being drivingly connected to the pivot shaft (28, 294). an actuator having an action end capable of performing a linear reciprocating movement; a link mechanism (292, 293), via which the actuator is connected to a pivot shaft (28, 294); and the pivot shaft (28, 294) connected to the reset lever, wherein the pivot shaft (28, 294) rotates when driven by the actuator so as to drive the reset lever to rotate; characterized in that the link mechanism (292, 293) comprises: a first link, a first end of the first link being pivotally connected to the action end of the actuator, and a second end of the first link being pivotally connected to a first end of a second link; and the second link, a second end of the second link being drivingly connected to the pivot shaft (28, 294). a first link, a first end of the first link being pivotally connected to the action end of the actuator, and a second end of the first link being pivotally connected to a first end of a second link; and the second link, a second end of the second link being drivingly connected to the pivot shaft (28, 294).