Abstract: A remote racking tool can have a drive assembly, remote control assembly, and radio remote pendant station. The remote racking can enable operators to install or remove circuit breakers in switchgear or equipment rooms while outside of an arc flash zone.

Abstract: Switchgear which combines a visible disconnect switch and a circuit breaker or interrupter capable of interrupting fault currents. The switchgear includes a carriage and a switch actuator connected to the carriage for moving the carriage between a switch-closed position and a switch-open position. A circuit breaker module includes circuit breaker contacts, as well as first and second contactor terminals. The circuit breaker module provides selective electrical connection between the contactor terminals depending on the state of the circuit breaker contacts. A fixed disconnect switch contact us attached to or comprises one of the first and second contactor terminals, and a movable disconnect switch contact is mounted to the carriage so as to move with the carriage. The fixed disconnect switch contact and the movable disconnect switch contact are positioned for selective engagement with each other as the carriage moves to the switch-closed position.

Abstract: Disclosed are a plug interlock device for a circuit breaker and a circuit breaker having the same, wherein a plug is not allowed to be separated from a connector while a breaker main body is moved from a test position to a run position or is running at the run position, thereby obviating the plug from being unexpectedly unplugged from the connector while the breaker main body is moved from the test position to the run position or is running, resulting in preventing a safety accident in advance.

Abstract: An electrical switchgear comprises a front, a back and a switch arrangement. The switch arrangement comprises a terminal arrangement comprising an electrical contact for a bus and an electrical contact for a load connection which are spaced apart along an axial direction; and a device that is driveable into said terminal arrangement to a service position to make an electrical connection between said electrical contact for said load connection and said electrical connection for said bus. The electrical contact for said load connection is located closer to said back of said switchgear than is said electrical contact for said bus.

Abstract: A circuit breaker and mechanism are provided for opening circuit breaker contact arms when the circuit breaker is moved between an installed and a withdrawn position in a drawout installation. The circuit breaker has a cross shaft coupled to a first linkage that rotates in response to the circuit breaker being moved. A second linkage translates in response to said first linkage rotating. A cam surface is operably coupled between the cross shaft and the first linkage. An opening latch shaft is coupled between the second linkage and a contact arm assembly such that the opening latch shaft moves the contact arm assembly from a closed position to an open position in response to the translation of the second linkage.

Abstract: An interlock system for a circuit-interrupting device. The circuit-interrupting device includes a gearbox, a load-breaker in series with a visible disconnect, and an assembly driving the visible disconnect between an open state and a closed state. The interlock system includes a cam and a bias-driven follower. The cam is coupled to a shaft and is driven by the shaft between a first cam state when the load-breaker is in an open state and a second cam state when the load-breaker is in a closed state. The bias-driven follower has a first follower state when the cam is in the first cam state and has a second follower state when the cam is in the second cam state. In the second follower state, the bias-driven follower blocks movement of at least one component of the assembly. The cam and the bias-driver follower are positioned inside the gearbox.

Abstract: A secondary disconnect apparatus for a circuit breaker, for making a slidable electrical connection with a mating enclosure-side secondary disconnect apparatus, is disclosed, having a pair of stop plate surfaces coupled to the circuit breaker defining a first linear distance D1, and a lateral adjustment portion in slidable communication with a pair of a guide members configured to guide movement of the lateral adjustment portion along an axis in one of a first and a second direction. The apparatus includes and a pair of adjustment member surfaces coupled to the lateral adjustment portion defining a second linear distance D2, wherein the adjustment member surfaces are configured to cooperate with the stop plate surfaces to limit the travel of lateral adjustment portion, and wherein a total predetermined lateral distance of travel of lateral adjustment portion 250 is defined based on at least the difference between first distance D1 and second distance D2.

Abstract: An identification system is provided for an electrical system. The electrical system includes a switchgear enclosure, a number of electrical switching apparatus, and a racking mechanism movably coupling the electrical switching apparatus to the enclosure. The identification system includes a control mechanism having a controller and a plurality of software programs. The controller includes a number of inputs from a corresponding one of the electrical switching apparatus, and a number of outputs to the racking mechanism. Each software program provides functionality to the outputs to control racking movement of a predetermined type of electrical switching apparatus. Responsive to the inputs from the electrical switching apparatus, the controller identifies the predetermined type of electrical switching apparatus, and then automatically selects a corresponding one of the software programs to control movement of the electrical switching apparatus.

Abstract: Provided herein is an interlock apparatus for preventing the drawing-in or drawing-out of a vacuum circuit breaker main body in interlock with the ground operation of a ground switch in a vacuum circuit breaker, and the ground switch interlock apparatus of the vacuum circuit breaker comprising: a drive spindle; a movable plate movable to a manipulation handle connection allowance position or a manipulation handle connection prohibition position; a first interlock plate that moves the movable plate to the manipulation handle connection allowance position or the manipulation handle connection prohibition position; and a second interlock plate to be moved to a position for locking the first interlock plate at the manipulation handle connection prohibition position when the ground switch is at a ground position and a position for releasing from the restraint of the first interlock plate when the ground switch is not at the ground position.

Abstract: Provided is a dual structured contact for switchgear, which includes a moving contact unit being formed of a conducting material, the moving contact unit including first and second terminals, the first terminal comprising a cylinder and the second terminal extending to a driving unit such that the moving contact unit moves back and forth by the driving unit, and a fixing contact unit being formed of a conducting material, the fixing contact unit including first and second cylinders being outside and inside of the fixing contact unit with same axis, an inner part of the first cylinder being in contact with an outer part of the first terminal, and an outer part of the second cylinder being in contact with an inner part of the first terminal.

Abstract: A switchgear system includes rail structure having a base coupled to an interior sidewall of a frame. A first member extends from the base and has an upwardly facing surface. The first member has a second surface extending generally transversely to the upwardly facing surface to oppose a surface of the base. A second member extends from the base and has a downwardly facing surface spaced from the upwardly facing surface so as to define a wheel receiving channel there-between. A circuit breaker tuck includes wheels on exterior sidewalls. The wheels are received in the wheel receiving channel to be slidable along the upwardly facing surface, with the upwardly and downwardly facing surfaces limiting movement of the circuit breaker truck about the horizontal axis and the surface of the base and the second surface of the first member limiting movement of the circuit breaker truck about the vertical axis.

Abstract: A draw-out type circuit breaker apparatus is provided and includes a base from which a circuit breaker is selectively dismounted and moved along a first portion of a dismounting path into a disconnected position, a plate, fixed to the base, which is configured to guide the movement of the circuit breaker along the dismounting path, and a toggle link, coupled to the plate and biased to remain in a locking position, which is configured to block the circuit breaker from moving along the dismounting path beyond the disconnected position while the toggle link remains in the locking position, and to cause the circuit breaker to freely move from the disconnected position and along a second further portion of the dismounting path upon a temporary defeat of the bias thereof.

Abstract: A voltage switchgear assembly is disclosed, which includes a short-circuiting unit having short-circuiting devices arranged as a three-phase unit. A support is configured to receive the short-circuiting unit and is configured to be inserted into and withdrawn from an openable section of a switchgear assembly housing.

Abstract: A shutter assembly is provided for an electrical system including at least one electrical switching apparatus, such as a circuit breaker, and a plurality of electrical bus members, and a plurality of electrical cable members, and a ground member with a plurality of contacts. Each of the conductors of the circuit breaker is removably coupled to a corresponding primary contact to electrically connect the circuit breaker to the electrical bus members and to electrically connect the circuit breaker to the electrical cable members and to electrically connect the circuit breaker to the ground members. The shutter assembly includes a flexible insulating member movably disposed between the conductors and the primary contacts.

Abstract: A system includes an electrical enclosure having an inner volume and a door structured to open to expose the inner volume and structured to close to enclose the inner volume. A racking mechanism is disposed in the inner volume and includes a member movable in a first direction to a first position and an opposite second direction to a different second position. A network protector is carried by the racking mechanism and is movable thereby between a connect position in the inner volume corresponding to the first position of the member of the racking mechanism, and a test position in the inner volume corresponding to the different second position of the member of the racking mechanism. A control mechanism is structured to move the member of the racking mechanism between the first position and the different second position of the member responsive to a number of remote commands.

Abstract: A lightweight portable electrical equipment racking tool and a method for racking, wherein the racking tool is adapted to raise or lower a gear assembly while operating the gear assembly to remove or install electrical equipment from a safe distance. The lightweight portable electrical equipment racking tool can include a cart, load bearing wheels, small wheels, a fixed mast segment, a moveable locking bracket, a moving slide segment, a flanged moveable locking bracket, a clutch assembly plate, a clutch bracket, a gear assembly, a drive assembly motor, a motor control, a controller, a clutch, a drive coupling, a power supply, and a support gusset.

Abstract: A circuit breaker interlock apparatus can include a circuit breaker, a first moveable arm that is moveable when the circuit breaker is open, a second moveable arm pivotally coupled to the first moveable arm that is movable when the first moveable arm is moveable and a blocking arm, configured to interlock with the second movable arm.

Abstract: Disclosed is a device for preventing withdrawing and inserting of a circuit breaker. The device for preventing withdrawing and inserting of a circuit breaker include: a lead screw is coupled between a carriage and a girder assembly and rotated by an external force to allow a breaker body to be closed or released while the carriage is moved with respect to a cradle, and a braking unit preventing the lead screw for operating when the girder assembly is released from the cradle. In an unstable state in which the girder assembly is not coupled to the cradle, a withdrawal handle is prevented from being inserted into the girder assembly. Therefore, an abnormal withdrawing operation can be prevented, and thus, various safety accidents, a contact resistance and temperature rise, damage to a device due to electrical breakdown can be prevented.

Abstract: An interlock device of a draw-out type circuit breaker, provided with a tripping button that is linked to a tripping mechanism of the draw-out type circuit breaker and an interlock rod that is placed so as to be movable up and down, and constructed so that the tripping button mechanically prevents an operation to raise the interlock rod unless the tripping button is operated to place the draw-out type circuit breaker in the open state, so a power distribution board floor surface or a member fixed on the power distribution board floor surface and the interlock rod interfere with each other, thereby the draw-out type circuit breaker is fixed at a prescribed position in a power distribution board.

Abstract: An electrical device removal tool, such as for circuit breakers, that is lightweight, portable, and rugged for providing electrically operated controlled insertion and removal of electrical equipment by an operator from a remote location using a coupling device for engagement with the electrical equipment housing.

Abstract: A switch arrangement for an electrical switchgear comprising a first bus, a second bus and a load connection. The switch arrangement comprises a breaker; wherein said breaker is moveable in said switchgear between a first position and a second position, such that in use, when said breaker is in said first position and closed it electrically connects said first bus to said load connection, and when said breaker is in said second position and closed it electrically connects said second electrical bus to said load connection, with said first electrical bus disconnected from said load connection.

Abstract: A subunit is provided for a motor control center including an enclosure, a number of compartments, a plurality of power lines, and a number of covers for covering the compartments. The subunit includes a housing removably disposed within a corresponding one of the compartments, a plurality of electrical contacts movably coupled to the housing, and an actuating assembly for moving the electrical contacts into and out of electrical contact with the power lines. The subunit further includes at least one of a locking assembly, a panel assembly, and a secondary disconnect assembly. The locking assembly locks the position of the electrical contacts and restricts access to the actuating assembly. The panel assembly is pivotable and translatable with respect to the subunit housing. The secondary disconnect assembly is independent from the actuating assembly in order that movement of the electrical contacts does not move the secondary disconnect assembly.

Abstract: A subunit is provided for a motor control center including an enclosure, a number of compartments, a plurality of power lines, and a number of covers for covering the compartments. The subunit includes a housing removably disposed within a corresponding one of the compartments, a plurality of electrical contacts movably coupled to the housing, and an actuating assembly for moving the electrical contacts into and out of electrical contact with the power lines. The subunit further includes at least one of a locking assembly, a panel assembly, and a secondary disconnect assembly. The locking assembly locks the position of the electrical contacts and restricts access to the actuating assembly. The panel assembly is pivotable and translatable with respect to the subunit housing. The secondary disconnect assembly is independent from the actuating assembly in order that movement of the electrical contacts does not move the secondary disconnect assembly.

Abstract: A circuit breaker interlock apparatus can include a circuit breaker, a first moveable arm that is moveable when the circuit breaker is open, a second moveable arm pivotally coupled to the first moveable arm that is movable when the first moveable arm is moveable and a blocking arm, configured to interlock with the second movable arm.

Abstract: A switching device, in particular an automatic switch, a disconnecting switch or a contactor, installable according to different operating configurations and preferably for use in low voltage systems. The device comprises a case containing at least a pair of contacts, one or more accessory devices for controlling and/or setting the operation of the switching device and user interface means, capable of performing output and/or input functions relative to the accessory devices. These interface means comprise at least a display which shows information relative to the output and/or input functions according to a viewing direction. The switching device also comprises means to select the viewing direction which are operatively connected to the display. These selection means allow selection of the viewing direction on the display as a function of the installation configuration of the switching device.

Abstract: A removable transformer system is described. The system comprises a switchboard structure, a removable transformer moveable into and out of the switchboard structure, and a transformer mounting and supporting assembly for supporting the removable transformer. During operation of the system, the removable transformer is horizontally displaceable along the supporting.

Abstract: A withdrawable device of a vacuum circuit breaker for transferring a vacuum circuit breaker received in a cradle, includes: a carriage on which the vacuum circuit breaker is loaded; a first transfer unit fixed to the carriage; a second transfer unit installed at one side of the cradle such that it can be driven, and transferring a transfer force to the first transfer unit; and a transfer limiting unit for selectively limiting driving of the second transfer unit.

Abstract: An apparatus for preventing withdrawing and insertion of a carriage of a circuit breaker is disclosed. When a circuit breaker main body is inserted, an interlocking unit operates by interworking with the carriage withdrawing and inserting preventing apparatus, and while the circuit breaker is being closed, a withdrawal and insertion handle prevents a lead screw from being rotated by the interlocking unit. Thus, when the circuit breaker performs a closing operation, unnecessary withdrawing and inserting operation of the carriage is basically prevented to thus prevent various safety accidents, a contact resistance, a temperature increase, and damage to a device resulting from a breakdown.

Abstract: Disclosed is a withdrawable device of main circuit for a circuit breaker. A ring-shaped guide recess is formed at a central part of a transfer nut screw-coupled to a lead screw, and supporting surfaces are formed on side surfaces of the guide recess. And, rotation prevention pins are elastically supported by springs in a moving direction of the transfer nut, and are selectively locked, thereby allowing the transfer nut to perform an idle operation. Accordingly, a structure for an idle operation of the transfer nut is simplified, and the number of components is reduced. An axial load is attenuated to a plane-contact distributed load, not a point-contact concentrated load, thereby preventing damage of the components. Also, a vacuum circuit breaker has enhanced reliability of the idle operation at a run position and a test position.

Abstract: A motor control bucket replacement tool, such as for circuit breakers, that is portable, and rugged for providing electrically operated controlled insertion and removal of electrical equipment by an operator from a remote location using an easily detachable magnetic coupling device for engagement with the electrical equipment and using a linear actuator.

Abstract: A portable power motorized racking tool having a front plate and a back plate disposed opposite, a first and second handle on the front plate, a motor mount secured to the front plate with a motor mount extension protruding through a shaft hole, a motor with torque limiting clutch attached to the motor mount, a battery between the plates supported by 4 braces connected to the front and back plates containing the battery; a power cable connecting the battery to the motor, a start button with ignition wire connecting the start button to the battery secured to the front plate for actuating the motor, a rotatable shaft connected to the torque limiting clutch and contained by the motor mount extension, an install switch and a remove switch each connected to the motor for rotating the rotatable shaft, and a universal tool connected to the rotatable shaft.

Abstract: A portable electrical equipment racking tool with an onboard power supply, controllers and drive assembly that can raise or lower the drive assembly while operating the drive assembly from a safe distance form the electrical equipment needing replacement.

Abstract: A draw-out mechanism for a molded case circuit breaker includes a fixed side plate and a plurality of auxiliary contacts mounted to the fixed side plate. The draw-out mechanism also includes a movable member moveably mounted to the fixed side plate. The movable member includes a cam member that acts upon the plurality of auxiliary contacts. The draw-out unit further includes a front panel member having a visual indicator mechanism and a locking mechanism provided with a padlock locking arm, a door lock and a second lever. In addition, the draw-out unit includes a connector plate that operatively couples the movable member and the front panel member. The connector plate includes a plurality of adjustment portions that establish a desired extension of the connector plate relative to the movable member to accommodate a predetermined spacing between the movable member and the front panel member.

Abstract: A configurable circuit breaker is disclosed which is, for example, applicable for medium voltage range, with flexibility in configuration, based on the electrical and mechanical constraints. The circuit breaker can include multiple poles, which can be fitted on a shaft at desired positions, using clamping, dowelling, bolting or other types of connections. An epoxy frame can mount the circuit breaker on a truck horizontally or vertically, by mounting inserts and the clamping mechanism. Side sheets of the pole allow internal access. Flexible contacts and the vertical slots enable adjustability in the incoming and outgoing distances, as per design constraints. A tulip contact can be provided for mounting incoming/outgoing conductors. A common actuator can be mounted anywhere on the shaft, via the movable contact or on any of the poles, which are robust enough.

Abstract: A plug-in housing module for forming an-explosion-proof switchgear/distribution panel including a number of plug-in points, where when the plug-in housing module is in a plugged-in position at a corresponding plug-in point of the number of plug-in points, the plug-in housing module is brought into contact with electrical connection devices and is detachably fixed to carrier rails of a frame of the switchgear/distribution panel, the plug-in housing module including at least one switching device for switching between a locking position and a release position, and when the at least one switching device is in the release position, the plug-in housing module can be moved out of the plugged-in position into a separation position, where in the separation position, the contact with the electrical connection devices is interrupted, while maintaining a flameproof mechanical connection.

Abstract: A circuit breaker replacement tool made of a cart with a base plate, wherein the base plate has at least two wheels. The cart has a right side and a left side with both sides connected on one end to the base plate. A height adjustable support arm holds a main linear actuator and an interlocking linear actuator for opening interlocks and installing or removing circuit breakers from circuit breaker cabinets.

Abstract: The invention relates to a fuse system for a switchgear assembly, especially for a medium voltage switchgear assembly. The fuse system comprises a plurality of fuses which correspond to the number of phases, every fuse having a tripping bar that projects from the face of the fuse under the effect of the force of a spring when the fuse comes into action. A sealing body, with a spring arrangement interposed, pushes a sealing head into the interior of a receptacle receiving the fuse. A two-armed lever is received on the sealing head, one arm covering a tripping mechanism which actuates a power switch.

Abstract: Provided are an air circuit breaker capable of allowing a closing spring to be automatically discharged at a pulled-out position in a pull-out type air circuit breaker and an automatic discharging apparatus for the closing spring in the air circuit breaker, the automatic discharging apparatus for the closing spring comprising a cam shaft rotation preventing unit installed on a cam shaft allowing the closing spring to be charged or discharged and configured to restrict the rotation of the cam shaft by an elastic restoring force of the closing spring, and a unit for releasing the cam shaft rotation preventing unit connected to the cam shaft rotation preventing unit and configured to allow the cam shaft to be rotated by the elastic restoring force of the closing spring according to positions where a main body of the air circuit breaker is pulled out of a cradle.

Abstract: A locking device for an electric switch is disclosed which is movably guided in a withdrawable rack via an actuating shaft wherein the electric switch is placed in a preferred position, in particular in a disconnected position. In at least one embodiment, the locking device is movable from a release position in which the switch is displaceable in the withdrawable rack to a locking position in which the locking device blocks the switch displacement in a predetermined direction and the actuating shaft is actuated via an actuating crank. In order to safe the switch locking in the preferred position thereof, the locking device is movable to the locking position when the actuating crank actuation is blocked, only. The withdrawable rack, provided with the inventive locking device for the electric switch displaceable in the withdrawable rack via the actuating shaft, is also disclosed.

Abstract: An interlock assembly for a bypass isolation open or closed transition ATS assembly is disclosed. The interlock assembly ensures that a switch assembly being worked upon and/or being inserted is in a neutral configuration, i.e. the switch assembly is not engaging a power source. The interlock assembly is, preferably, an electrical interlock having a control system structured to configure the switch assemblies and to monitor the configuration of the switch assemblies. That is, the switch assemblies each include a power operated, conductive, movable contact arm. The position of each contact arm is controlled, and monitored by, the control system which controls the single actuator for each contact arm.

Abstract: Disclosed are a plug interlock device for a circuit breaker and a circuit breaker having the same, wherein a plug is not allowed to be separated from a connector while a breaker main body is moved from a test position to a run position or is running at the run position, thereby obviating the plug from being unexpectedly unplugged from the connector while the breaker main body is moved from the test position to the run position or is running, resulting in preventing a safety accident in advance.

Abstract: Provided herein is an interlock apparatus for preventing the drawing-in or drawing-out of a vacuum circuit breaker main body in interlock with the ground operation of a ground switch in a vacuum circuit breaker, and the ground switch interlock apparatus of the vacuum circuit breaker comprising: a drive spindle; a movable plate movable to a manipulation handle connection allowance position or a manipulation handle connection prohibition position; a first interlock plate that moves the movable plate to the manipulation handle connection allowance position or the manipulation handle connection prohibition position; and a second interlock plate to be moved to a position for locking the first interlock plate at the manipulation handle connection prohibition position when the ground switch is at a ground position and a position for releasing from the restraint of the first interlock plate when the ground switch is not at the ground position.

Abstract: A subunit is provided for a motor control center including an enclosure, a number of compartments, a plurality of power lines, and a number of covers for covering the compartments. The subunit includes a housing removably disposed within a corresponding one of the compartments, a plurality of electrical contacts movably coupled to the housing, and an actuating assembly for moving the electrical contacts into and out of electrical contact with the power lines. The subunit further includes at least one of a locking assembly, a panel assembly, and a secondary disconnect assembly. The locking assembly locks the position of the electrical contacts and restricts access to the actuating assembly. The panel assembly is pivotable and translatable with respect to the subunit housing. The secondary disconnect assembly is independent from the actuating assembly in order that movement of the electrical contacts does not move the secondary disconnect assembly.

Abstract: Disclosed herein is a method of moving and altering movement of a breaker mounted spring discharge interlock lever during racking and unracking of a breaker with an enclosure. The method includes, rotating a racking screw to rack the breaker into or out of the enclosure, rotating a shaft in operable communication with the racking screw, translationally moving a cam with a link having one end disconnectably connected to the cam and an opposing end disconnectably connected to a crank, that is fixedly attached to the shaft, translationally moving a cam follower that is in operable communication with the cam, moving the breaker mounted spring discharge interlock lever that is in operable communication with the cam follower, and enabling removal and replacement of the cam by disconnecting the cam from the link, thereby enabling the movement of the breaker mounted spring discharge interlock lever to be altered.

Abstract: A seal apparatus is disposed between a switchgear cabinet and a circuit breaker between the racked and unracked positions of the circuit breaker. The seal apparatus sealingly extends between the switchgear cabinet and the circuit breaker to resist fluid flow, such as exhaust gases and other matter, between an interior region of the switchgear cabinet and the exterior of the switchgear cabinet.

Abstract: A modular racking system for an electrical switching apparatus is provided. The modular racking system includes a carriage assembly structured to support electrical switching apparatus and at least one cam follower structured to be removably coupled to the electrical switching apparatus.

Abstract: A drawout system with an interface proving a lower ingress protection rating is provided. The system includes a flange mounted to a door. A sleeve is movably mounted to the door adjacent to the flange. As the circuit breaker is moved from a racked-in position to a test position to a racked-out position, the sleeve moves with the circuit breaker and avoids creating exposure to electrical components within the drawout. The drawout system allows the operator to operate the circuit breaker with the door open or closed.

Abstract: Withdrawable racks for power circuit breakers should be reliably switched. To this end, the movement of the plates of a shutter in the withdrawable rack can be blocked so that the shutter is not permitted to open unintentionally. In a special embodiment, the opening mechanism for the plates can have two V-shaped linkages that are connected to a telescopic rod. The telescopic rod can be locked by a locking element so that the shutter plates, which can be moved by sliders, can no longer be displaced.

Abstract: The invention relates to a module front for a switchgear module, particularly a slide-in module, comprising a control device, the control device being integrated in the module front, and the module front forms an integral component of the switchgear module. The invention relates to a switchgear module, particularly a slide-in module provided with an inventive module front, and to a switchgear equipped with at least one switchgear module of this type.

Abstract: A dampening mechanism for an electrical for an electrical switching apparatus, such as a draw-out circuit breaker, includes a mounting bracket coupled to the circuit breaker, a pivot member, at least one biasing element, and a damper. The circuit breaker is movable into and out of an installed position within a switchgear enclosure. The pivot member pivots between first and second positions corresponding to the circuit breaker not being fully installed and being disposed in the installed position, respectively. The biasing element biases the pivot member toward the first position. When the circuit breaker is moved toward the installed position, the second end of the pivot member engages at least one of a back panel and a ledge of the enclosure, thereby pivoting the pivot member toward the second position. When the pivot member is disposed in the second position, the damper is biased against the ledge of the enclosure to dampen undesired vertical motion of the circuit breaker.