A switchgear apparatus includes a vacuum interrupter assembly having a fixed contact and a movable contact, and an electromagnetic actuator configured to move the movable contact between an open position and a closed position. The switchgear apparatus also includes a rotatable handle and a manual trip assembly movable from an initial position to an actuated position to move the movable contact from the closed position to the open position. The manual trip assembly includes a link rotatably coupled to the handle and an actuation member operatively coupled to a first end of the link. A mechanical interlock assembly includes a lost motion member operatively coupled to a second end of the link and a blocking plunger. Rotation of the link by the handle operates the lost motion member to provide delayed movement to the blocking plunger when the handle is rotated from the initial position to the actuated position.

A switchgear apparatus includes a vacuum interrupter assembly having a fixed contact and a movable contact, and an electromagnetic actuator configured to move the movable contact between an open position and a closed position. The switchgear apparatus also includes a rotatable handle and a manual trip assembly movable from an initial position to an actuated position to move the movable contact from the closed position to the open position. The manual trip assembly includes a link rotatably coupled to the handle and an actuation member operatively coupled to a first end of the link. A mechanical interlock assembly includes a lost motion member operatively coupled to a second end of the link and a blocking plunger. Rotation of the link by the handle operates the lost motion member to provide delayed movement to the blocking plunger when the handle is rotated from the initial position to the actuated position.

The present disclosure relates to an interlock module, a circuit breaker movement unit and a switchboard comprising same. Provided is the interlock module comprising: an outer case in which an interlock guide pin is moveable along the top surface thereof and a plurality of grooves are formed on the top surface to enable insertion of the interlock guide pin; a guide plate which is arranged inside the outer case, and which moves to the rear surface of the outer case if a handle is inserted into a handle insertion hole; and a link plate which is connected to the guide plate, and which moves toward the top surface of the outer case when the guide plate moves to the rear surface of the outer case, wherein the link plate enables the interlock guide pin to move at a height greater than or equal to that of the top surface of the outer case when moving toward the top surface of the outer case.