Abstract: An apparatus for interlocking the connection handle of a module for a motor control center (MCC) engages a locking plate to prevent inadvertent motion of the connection handle. When the apparatus is not pressed, it allows the locking plate to fully engage the connection handle, preventing the connection handle from changing position. When the apparatus is in a first angular orientation, it may only be pressed into the module for a first depth. At the first depth, the apparatus engages the locking plate to allow the connection handle to transition between an off position and a test position. When the apparatus is rotated to a second angular orientation, it may be pressed into the module for a second depth. At the second depth, the apparatus causes the locking plate to disengage the connection handle, allowing the connection handle to be moved between any desired position.

Abstract: Systems, apparatus, methods, and techniques of assembly of discrete modules of a control panel are disclosed. The modules can be independently wired, tested, and installed into a control panel. Module definitions are defined specifying components to perform the electrical function, a mechanical arrangement of the components, electrical connections, and logical interactions of the module. A bill of materials can be generated based on a designation of a set of modules for a control panel and the module definitions. Modularly assembled control panels are disclosed. An assembly frame is described herein for temporarily mounting components of a module for independent assembly of a control module and for eventual removal and installation into a control panel frame. The assembly frame may include a faceplate frame and side frames and temporary mounting features.

Abstract: A switchgear system may include a switchgear frame, a truck and circuit breaker mounted thereon. A drive mechanism is mounted on the switchgear frame and configured to rack the circuit breaker into a) a first connected position where the primary and secondary circuits are electrically connected, b) a second test position where the primary circuit is electrically disconnected and secondary circuit connected, and c) a third disconnected position where the primary and secondary circuits are electrically disconnected, wherein said drive mechanism comprises a drive chain and shuttle configured to engage the truck and rack and fix the circuit breaker into the first connected position.

Abstract: A racked in and out circuit breaker for a cubical housing of electrical switchgear has a back to front, threaded rod mechanism and, at the rear of the cubical a stationary and interior threaded bolt is provided so that when the rod is turned the circuit breaker is mechanically pulled into the cubical and, if turned oppositely, causes the circuit breaker to move out of the cubical housing. A non-threaded section of the rod cooperates with the same bolt so that when it is within the threads of the bolt, further effort at rotating the rod prevents further rearward movement of the circuit breaker.

Abstract: A triggering mechanism is for a switching device, in particular for low-voltage devices and systems, medium-voltage devices and systems, and/or high-voltage devices and systems. The triggering mechanism includes a lever, equipped with two rolls for blocking purposes.

Abstract: A method of assembling a circuit breaker installation includes inserting a carrier carrying a circuit breaker connected to a connector assembly having a connector pin into a first opening of a chassis and receiving a guide pin that extends from the carrier in a guide slot that is defined in a panel of a panel interface assembly plate that is disposed within a second opening of the chassis.

Abstract: Disclosed is a device for remotely racking a circuit breaker into and out of a circuit breaker cradle received within a circuit breaker module. The device comprises an actuator configured to rotate a breaker shaft in a first direction and an opposite second direction to rack the circuit breaker into and out of the circuit breaker cradle without the need for an operator to attend in the vicinity of the circuit breaker module.

Abstract: A retrofit kit for installing an updated electrical power switch box in a facility power station. The retrofit kit includes an adaptor support frame for attaching to a support structure of the facility power station and for a preselected or predetermined depth positioning of the updated electrical power switch box relative to the three line side bussings and the three load side bussings of the facility power station. The retrofit kit also includes adaptor bars that overlap with and connect the breaker stabs of the updated electrical power switch box to the bussings, and include three line side adaptor bars that connect the three line side breaker stabs to the respective three line side bussings, and three load side adaptor bars that connect the three load side breaker stabs to the respective three load side bussings.

Abstract: The invention relates to a switching device, in particular an on-load tap changer, having a housing and at least one exchangeable switching module. The switching device (1), in particular on-load tap changer, comprises a housing (2); an exchangeable switching module (3, 3?, 3?); a fixed contact (20) arranged inside the housing (2); a guide rail (25) arranged inside the housing (2). The switching module (3, 3?, 3?) has a movable contact (10) that can be releasably connected to the fixed contact (20). The switching module (3, 3?, 3?) has a lower distribution plate (51) that is movably connected to the guide rail (25).

Abstract: An interlock apparatus of a ring main unit is provided. The interlock apparatus of the ring main unit may change a rotational motion of the shaft included in the circuit breaker to a rectilinear motion, and thus, the insertion hole may be opened or closed according to a closed or cutoff state of the circuit breaker. Accordingly, in the closed state of the circuit breaker, the control of a state of the disconnector is prevented.

Abstract: Interlock structure for a circuit breaker is constructed and arranged such that 1) when a control plug is disconnected from a socket, a portion of a linkage structure engages a racking linkage, causing a portion of the racking linkage to engage a racking screw, preventing the racking screw from rotating and thus preventing racking of the circuit breaker, and 2) when the control plug is connected with the socket, the linkage structure is actuated thereby moving the portion of the linkage structure to disengage from the racking linkage such that the portion of the racking linkage disengages from the racking screw, permitting the racking screw to rotate thereby permitting the circuit breaker to be racked to a connected position, where the primary contacts are connected to the main bus.

Abstract: A medium voltage switchgear (1) which is characterized in that it comprises a casing (2) defining an internal volume for housing at least a circuit breaker assembly (4) movable between at least two operative positions, said casing comprising a front panel (21) provided with an opening (5) for the insertion of an operating handle (8) for actuating the movement of said circuit breaker assembly between said operative positions, a closing and retaining device (6) being positioned in correspondence of said opening (5) and movable between a closed position when said operating handle is not inserted and an open position for allowing insertion of said operating handle, said closing and retaining device (6) comprising locking means for retaining said operating handle in position when inserted in said opening.

Abstract: A power operator for switchgear for use in mains power distribution systems such as public medium high voltage distribution systems, where the switchgear comprises a closed cabinet (5) with an operating shaft protruding therefrom that is rotatable between two positions and has a coupling part. The motor operator includes a housing (11, 20, 21, 27) which is mountable on an external surface (4) of the switchgear cabinet (5), and a rotatable connection shaft connected to an electromechanical linear actuator. The connection shaft has a first coupling part which connects with the coupling part of the switchgear in a longitudinal axial sliding and non-rotational interlocking manner. The housing (11, 20, 21, 27) is a tube element which is tamper resistant, is relatively easy to seal against dust and moisture, and is inexpensive to manufacture.

Abstract: A system having electrical equipment integrated on a structure is provided. The system includes at least one electrical equipment located at a spaced apart relationship and mounted on at least one structure. A method is provided for isolation of electrical equipment. The method includes opening and closing a contact by engaging or disengaging one or more terminals of the electrical equipment correspondingly with a supply line or a distribution line by a mechanism for isolation. The mechanism can be a handle or a moving mechanism which is associated with a movement in a vertical direction or horizontal direction or with a movement that provides isolation.

Abstract: A truck (12?) for mounting a circuit breaker (13) in a switchgear frame (14?) includes wheels (16), a racking screw (20), a nut (22) threaded with the racking screw. The nut floats linearly with respect to the truck. A spring (23) is provided between a portion of the truck and the nut such that during movement of the truck into the frame, rotation of the racking screw causes linear movement of the nut, with the nut pushing against the spring, with the spring pushing the truck to move the truck linearly. Locking structure is coupled with the such that when the truck is stopped and the racking screw continues to rotate, the nut will move to compress the spring, causing the locking structure to move from an unlocked position, disengaged with the frame, to a locked position, engaged with the frame.

Abstract: A piston rod (15) and a first piston (13) are arranged in the interior of an external cylinder (11) and internal cylinder (12); a second piston for absorbing the change of volume of operating fluid (24) is also arranged therein. Also, a first return spring (18) for returning the piston rod (15) to the interruption position is provided and a second return spring (20) for returning the operating fluid 24 into the high-pressure chamber (25) by pressurizing the second piston (14) is provided. In addition, the air in the interior of the buffering device (10) is withdrawn by a vacuum pump (38), and operating fluid (24) is thus introduced in a degassed condition.

Abstract: An undercarriage for use with a circuit breaker includes a bottom plate, a front beam removably coupled to the bottom plate via a lead screw, wherein the lead screw is configured to engage with a threaded support that is coupled to the bottom plate to facilitate racking the circuit breaker in a switchgear. The undercarriage also includes a keylock assembly configured to enable racking the circuit breaker in the switchgear. The keylock assembly includes a lock and an interlock configured to couple to the lock such that the interlock is movable between a locked position and an unlocked position, wherein engagement of a racking handle with the lead screw is enabled when the interlock is in the unlocked position.

Abstract: A coupling is for a racking assembly for racking an electrical apparatus into and out of an enclosure with an actuator. The electrical apparatus includes a housing. The racking assembly includes a safety interlock, which is movable between a locked position, and an unlocked position corresponding to the racking assembly being operable to rack the electrical apparatus into or out of the enclosure. The coupling includes an adapter having a first portion coupled to the racking assembly, and a second portion coupled to the actuator. A sleeve is movably disposed on the adapter. The sleeve moves the safety interlock from the locked position to the unlocked position. When the safety interlock is disposed in the unlocked position, the adapter transfers movement of the actuator to the racking assembly to move the electrical apparatus.

Abstract: A position locking device is disclosed for a draw-out circuit breaker. In at least one embodiment, the position locking device includes a screw rod, a catching plate, a positioning plate, a locking plate, and a push rod. The screw rod has key ways. The catching plate has a catching plate hole and a protrusion that can be inserted into the key ways. Positioning notches for limiting OFF, TEST, and ON positions of the circuit breaker are formed on the top surface of the positioning plate, and corresponding protruding platforms are disposed on the bottom surface. One end of the locking plate bears against the bottom surface of the positioning plate, and the other end is locked to or unlocked from an outward protruding platform of the catching plate. One end of the push rod passes through the catching plate hole, and has an inclined surface. When the push rod is pushed, the inclined surface makes the catching plate leave the key ways.

Abstract: A system and method for connecting supply power to motor control components includes use of a motor control center subunit with moveable supply power contacts. After a motor control center subunit is secured into a motor control center compartment, the supply power contacts may be advanced to engage supply power buses. For disconnection, the supply power contacts may be refracted and isolated from the buses before physical removal of the subunit.

Abstract: A motorized racking mechanism for racking a circuit breaker into and out of switchgear/board equipment allows for breaker service without operator proximity to the switchgear. A motor fixed to a cradle that receives a circuit breaker is coupled to a power transmission system that turns a control screw. The control screw laterally moves a crown-wheel device that causes the circuit breaker to be moved among a remove, test, and connected positions in response to a button arm being depressed via a front panel of the cradle. The button arm can be depressed under wireless remote control. A solenoid is coupled to a crank detent actuator that includes the button arm, and a wireless module actuates the solenoid, which moves the button arm, causing the motorized movement of the circuit breaker as if the button arm had been manually depressed. Indicator lights are visible on the front panel to indicate the position of the circuit breaker relative to the cradle.

Abstract: A motor box is used to rack withdrawable devices into or out of the associated cell in a switchgear cabinet. A hand held control is used to operate the motor box from a remote location. The motor box is attached to a mounting assembly on the switchgear cabinet door. The assembly can be part of the door or separately attached to the door. The mounting assembly allows for easy alignment of the motor box to the door and prevents rotation of the motor box when the box is latched to the mounting assembly. A cart is used to transport the motor box, remote control and associated peripherals to and from the switchgear cabinet.

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 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: An undercarriage for use with a circuit breaker includes a bottom plate, a front beam removably coupled to the bottom plate via a lead screw, wherein the lead screw is configured to engage with a threaded support that is coupled to the bottom plate to facilitate racking the circuit breaker in a switchgear. The undercarriage also includes a keylock assembly configured to enable racking the circuit breaker in the switchgear. The keylock assembly includes a lock and an interlock configured to couple to the lock such that the interlock is movable between a locked position and an unlocked position, wherein engagement of a racking handle with the lead screw is enabled when the interlock is in the unlocked position.

Abstract: A motor operator for switchgear (1) for use in mains power distribution systems such as public medium high voltage distribution systems, where the switchgear comprises a closed cabinet (2) with an operating shaft (6) accessible from the front surface (4). The operating shaft is rotatable at least between two positions and has, a coupling part. The motor operator comprises a worm gear in a separate worm gear housing (11), which is mountable on the external surface of the switchgear cabinet. An adapter (21) with a connection shaft (22) is located in a recess in the worm wheel (16). The worm of the worm gear is connected to a motor which could be located remotely from the worm gear housing and connected to the worm preferably by means of a flexible shaft (15). This renders it possible to mount the motor operator in confined spaces.

Abstract: A motorized racking mechanism for racking a circuit breaker into and out of switchgear/board equipment allows for breaker service without operator proximity to the switchgear. A motor fixed to a cradle that receives a circuit breaker is coupled to a power transmission system that turns a control screw. The control screw laterally moves a crown-wheel device that causes the circuit breaker to be moved among a remove, test, and connected positions in response to a button arm being depressed via a front panel of the cradle. The button arm can be depressed under wireless remote control. A solenoid is coupled to a crank detent actuator that includes the button arm, and a wireless module actuates the solenoid, which moves the button arm, causing the motorized movement of the circuit breaker as if the button arm had been manually depressed. Indicator lights are visible on the front panel to indicate the position of the circuit breaker relative to the cradle.

Abstract: Disclosed is a racking tool for use with a breaker having a frontwardly-projecting racking screw, the screw being rotatable, about a frontwardly-orientated screw axis, between connected and disconnected positions. The racking tool comprises: a gripping tool that, in use, engages said screw and is rotatable about the screw axis to drive the screw between the connected and disconnected positions; an angle drive mechanism coupled to the gripping tool: and a shaft having a first end operatively coupled to the drive mechanism, a second end and a shaft axis extending from the first to the second end, the shaft, in use, being angularly orientated to the screw axis and adapted such that, with the gripping tool engaged with said racking screw, the screw can be rotated between the connected and disconnected positions by a user standing to one side of the breaker and rotating the shaft about its axis.

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: A switchgear apparatus is provided in which an impact induced by a close operation is mitigated, featuring space saving and high reliability with low costs. The switchgear apparatus includes a switching unit 3 that is composed of a fixed electrode 1 and a movable electrode 2; a movable shaft 4 that is extended from the movable electrode 2; an operating mechanism 5 that produces driving force and transfers the driving force to the movable shaft 4; a switching-unit holder 6 that holds the switching unit 3 and the movable shaft 4 thereinside; and a holder supporting unit 7 that has a fixing plane so as to fix the switching-unit holder 6 thereonto. The switchgear apparatus is arranged in such a manner that the holder supporting unit 7 serving as the fixing plane is constituted of a plurality of plates layered in the axial direction along the movable shaft 4.

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: Disclosed is a racking mechanism for a drawout circuit breaker including a cross shaft movably positioned in an enclosure and at least one input link in operable communication with the cross shaft via at least one connecting link. At least one racking cam is movably positioned in the enclosure and is in operable communication with the input link. Each racking cam has at least one cam slot receptive of a portion of the circuit breaker. Movement of the cross shaft about an axis of the cross shaft is capable of moving the at least one racking cam from an open position toward a closed position with the portion of the circuit breaker disposed in the at least one cam slot, thereby securing the circuit breaker in the enclosure and the at least one racking cam is in the closed position. A method for securing a circuit breaker in an enclosure and a circuit breaker assembly are also disclosed.

Abstract: A position locking device is disclosed for a draw-out circuit breaker. In at least one embodiment, the position locking device includes a screw rod, a catching plate, a positioning plate, a locking plate, and a push rod. The screw rod has key ways. The catching plate has a catching plate hole and a protrusion that can be inserted into the key ways. Positioning notches for limiting OFF, TEST, and ON positions of the circuit breaker are farmed on the top surface of the positioning plate, and corresponding protruding platforms are disposed on the bottom surface. One end of the locking plate bears against the bottom surface of the positioning plate, and the other end is locked to or unlocked from an outward protruding platform of the catching plate. One end of the push rod passes through the catching plate hole, and has an inclined surface. When the push rod is pushed, the inclined surface makes the catching plate leave the key ways.

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: 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: Disclosed is a racking mechanism for a drawout circuit breaker including a cross shaft movably positioned in an enclosure and at least one input link in operable communication with the cross shaft via at least one connecting link. At least one racking cam is movably positioned in the enclosure and is in operable communication with the input link. Each racking cam has at least one cam slot receptive of a portion of the circuit breaker. Movement of the cross shaft about an axis of the cross shaft is capable of moving the at least one racking cam from an open position toward a closed position with the portion of the circuit breaker disposed in the at least one cam slot, thereby securing the circuit breaker in the enclosure and the at least one racking cam is in the closed position. A method for securing a circuit breaker in an enclosure and a circuit breaker assembly are also disclosed.

Abstract: An integrated circuit breaker levering in and hoist crank tool provides a single tool for operating both a winch for raising and lowering a circuit breaker, and a levering in assembly for moving a circuit breaker forward and rearward within its cabinet.

Abstract: A latch kit comprising a member with at least one hook end, a tension member, and a hook plate. The hook plate is connected to the member by a tension member. The kit is intended to be used in conjunction with an industrial circuit breaker which is secured in a cell by a catch plate. When the hook plate is attached to the circuit breaker, the hook end can be used to support the circuit breaker's catch plate handle in the open position so that the circuit breaker can be extracted from the cell.