Abstract: A circuit breaker may include a first magnetic actuator connected to a first single-phase vacuum interrupter, a second magnetic actuator connected to a second single-phase vacuum interrupter, and a third magnetic actuator connected to the third single-phase vacuum interrupter. Each magnetic actuator is configured to receive an interrupt signal, and in response, actuate a respective vacuum interrupter connected thereto into an open circuit condition. Each magnetic actuator includes a fixed core, a plurality of permanent magnets surrounding the fixed core, and a movable core received within the fixed core. A controller generates an interrupt signal to a respective magnetic actuator and interrupts one or more of the first, second and third single-phase vacuum interrupters.

Abstract: The present disclosure makes it possible to reduce intervals between device units placed in a gas-insulated switchgear, thus achieving size reduction of the gas-insulated switchgear. A gas-insulated switchgear includes: a device housing having an operation door; a sealed container placed inside the device housing; and a circuit breaker unit and a ground switch unit attached to a side surface of the sealed container opposed to the operation door, via flange portions. A distance from the operation door to the side surface of the sealed container opposed to the operation door is different between a part where the circuit breaker unit is attached and a part where the ground switch unit is attached, so as to avoid interference between the circuit breaker unit and the ground switch unit.

Abstract: A system for controlling a vacuum interrupter for a power diverter switch comprises a main driving shaft which is configured to drive the control cam. The system further comprises the vacuum interrupter which is configured to separate electrical contacts in a vacuum by use of a contact rod, and a transmission unit which is configured to transmit the force generated by the main driving shaft to the contact rod. The transmission unit comprises a plurality of rollable guiding elements and a lever mechanism which is coupled to both the control cam and the contact rod of the vacuum interrupter such that a rotation of the control cam generated by the main driving shaft causes a movement of the contact.

Abstract: An interrupter unit includes a vacuum switch tube and an insulating housing. The insulating housing has an inner surface. The vacuum switch tube is bordered at least partially by an electrically insulating structure material having an outer surface. The insulating housing at least partially surrounds the vacuum switch tube. In operation, inner surface of the insulating housing and outer surface of the vacuum switch tube are separated by an adhesion layer. The inner surface and the outer surface are provided at least partially with an electrically conductive layer such that, in a boundary region between vacuum switch tube and insulating housing, the following layer sequence is directed radially outwards from a switch axis: structure material of vacuum switch tube; outer surface of structure material; conductive layer on outer surface of structure material; adhesion layer; conductive layer on insulating housing; inner surface of insulating housing; volume material of insulating housing.

Abstract: Provided is a gas-insulated switchgear having a circuit breaker tank with a reduced size. The gas-insulated switchgear includes: a connection conductor connected to two or more power cables, for each phase, inside the circuit breaker tank; a solid-insulated bus placed outside the circuit breaker tank and connected to the connection conductor via a connection bushing; and an instrument current transformer attached to the solid-insulated bus.

Abstract: A system for controlling a vacuum interrupter for a power diverter switch comprises a main driving shaft which is configured to drive the control cam. The system further comprises the vacuum interrupter which is configured to separate electrical contacts in a vacuum by use of a contact rod, and a transmission unit which is configured to transmit the force generated by the main driving shaft to the contact rod. The transmission unit comprises a plurality of rollable guiding elements and a lever mechanism which is coupled to both the control cam and the contact rod of the vacuum interrupter such that a rotation of the control cam generated by the main driving shaft causes a movement of the contact.

Abstract: A vacuum circuit breaker includes: an insulating rod disposed within a grounded tank; a drive conductor connected to the insulating rod; a first bushing and a second bushing connected to the side of the grounded tank; vacuum valves including movable contacts; levers rotatably coupled at end portions on one side to the insulating rod or the drive conductor; movable conductors electrically connected at end portions on one side to the movable contacts; and links rotatably coupled at end portions on one side to the end portions on the other side of the movable conductors and rotatably coupled at end portions on the other side to the end portions on the other side of the levers.

Abstract: A contact bounce reduction system including: a movable member, and a contact bounce damping device including: a body, a first ball and a second ball, a first resilient member and a second resilient member, a piston. The first resilient member holds the first ball in the seat and the second resilient member holds the second ball in the seat when the piston is in a default extended position, and a third resilient member biases the piston towards the default extended position. The movable member actuates the piston towards the retracted position, causing the first ball and the second ball to move radially out from the seat, and the third resilient member to accumulate energy.

Abstract: A circuit breaker for connecting at least two line sections in an interruptible manner has at least one pair of vacuum tubes, each with a stationary switching contact and a movable switching contact. The switching contacts of the vacuum tubes are electrically connected in series. The movable switching contacts of the vacuum tubes are coupled to a common actuator and can be simultaneously switched by a movement of the actuator.

Abstract: A switchgear or control gear includes: a first compartment; at least one removable module; a plurality of main switchgear or control gear components; and a plurality of auxiliary switchgear or control gear components. The plurality of main switchgear or control gear components are sub-divided into a first group of components that have a lifetime greater than a threshold level and a second group of components that have a lifetime less than or equal to the threshold level. The plurality of auxiliary switchgear or control gear components are sub-divided into a first group of components that have a lifetime greater than the threshold level and a second group of components that have a lifetime less than or equal to the threshold level.

Abstract: A switchgear or control gear includes: at least one first compartment; a second compartment; a plurality of main switchgear or control gear components, the plurality of main switchgear or control gear components including a main busbar system, a three position linear or rotational movement disconnector, a circuit breaker, and a cable connection; and a plurality of auxiliary switchgear or control gear components, the plurality of auxiliary switchgear or control gear components including a disconnector drive and a circuit breaker drive. The plurality of main switchgear or control gear components are housed in the at least one first compartment. The plurality of auxiliary switchgear or control components are housed in the second compartment. The circuit breaker and three position or rotational movement disconnector are mounted vertically in the at least one first compartment.

Abstract: A switch for medium voltage applications is provided. The switch comprises a vacuum interrupter having a fixed contact, a movable contact movable in a first direction to and away from the fixed contact between a closed position and an open position, and a drive rod arranged to the movable contact for moving the contact between the closed position and the open position. The switch further comprises a changeover switch having a first terminal body, a second terminal body, an elongated pole body, and an operating rod. The elongate pole body is hinged with a first end to the first terminal body and rotatable between a connected position in which the second end of the pole body is in direct electrical contact with the second terminal body and a disconnected position in which the second end is disconnected from the second terminal body.

Abstract: A medium voltage switching pole includes: a fixed contact of a vacuum interrupter; a movable contact of the vacuum interrupter; a piston; at least one electrical contact; a first terminal; and a second terminal. The fixed contact is fixedly connected to the first terminal. The movable contact is fixedly connected to the piston. The piston moves within the second terminal along an axis. The at least one electrical contact makes an electrical connection between the piston and the second terminal. An outer surface of the piston and an inner surface of the second terminal are arranged such that: when in an open configuration the fixed contact and movable contact are separated, at least one first radial line perpendicular to the axis extends through locations of the at least one electrical contact, and a first distance along the at least one first radial line extends from the outer surface.

Abstract: A base and a detection device for installing a detection apparatus are provided. The base includes a base member, a first fixing member, provided on the base member for fixing the detection apparatus, and an extension member, configured to transmit an electric signal to the detection apparatus, in which the extension member extends outward to a predetermined position of the base member. The detection device includes a detection apparatus and the base.

Abstract: An actuator for circuit interrupter has a stationary magnetic boss, a movable magnetic armature and a drive rod. The drive rod is aligned on an axis of the circuit interrupter. The drive rod has two stable positions, circuit interrupter closed and circuit interrupter open. The drive rod has a surface that the armature contacts to move the drive rod from the circuit interrupter closed position to the circuit interrupter open position. In the circuit interrupter closed position, the armature and the surface are separated by a pre-travel distance. The armature is to move towards the stationary magnetic boss and contact the surface, to initiate a circuit interrupter disconnecting motion of the drive rod with a transfer of momentum to the drive rod.

Abstract: The invention relates to a drive rod for driving a movable contact element of a high-voltage switching device, wherein said drive rod comprises a first section for connecting said drive rod to a drive mechanism, a second section for connecting said drive rod to said movable contact element, and an intermediate section between said first section and said second section, characterized in that said intermediate section comprises coupling means for rotatably coupling said first section to said second section.

Abstract: A circuit breaker includes an interrupter configured to selectively prevent a flow of electrical current through the circuit breaker, and an assembly. The assembly includes a housing, an interrupter mechanism, and an arc protection mechanism. The housing includes an opening configured to channel an arc fault discharge generated during an arc fault into the housing. The interrupter mechanism is coupled to the housing and the interrupter, and is configured to move the interrupter between a first position and a second position, wherein the first position prevents a flow of electrical current through the circuit breaker and the second position permits a flow of electrical current through the circuit breaker. The arc protection mechanism is within the housing and is configured to receive the arc fault discharge through the housing and to cause the interrupter to move to the first position in response to the arc fault discharge.

Abstract: A device is for guiding a spring belonging to a control mechanism. The device includes two elements capable of sliding relative to one another and being linked in an articulated manner respectively to two axes of which at least one is linked mechanically to an operating shaft, and a compression spring mounted around these two elements and bearing by its two opposing ends respectively on the abovementioned two axes via, respectively, two bases, each of its bases being mounted in an articulated manner relative to one of the abovementioned axes. This device includes two rods, each rod being fixed by one of its ends onto one of the abovementioned bases, and being mounted to slide by its opposite end, relative to the other of the abovementioned bases.

Abstract: A subsea circuit breaker for a subsea power distribution system. The subsea circuit breaker includes a circuit breaker enclosure, first and second contacts and an electro-mechanical actuator. The subsea circuit breaker is also furnished with a mechanical transmission mechanism for opening or closing the contacts in response to a mechanical command operation from the outside of the circuit breaker enclosure.

Abstract: A bypass switch includes: a casing; a vacuum interrupter disposed inside the casing, the vacuum interrupter being disposed such that a movable contact is movable to a fixed contact; a first fixing bus-bar fixed to the casing; a second fixing bus-bar fixed to the casing to be spaced apart from the first fixing bus-bar; a moving pusher connected to the movable contact; a drive source installed in the casing, the drive source pushing the moving pusher to a position at which the movable contact and the fixed contact are contacted with each other; and a multi-contactor disposed to be contacted with the moving pusher. Accordingly, the moving pusher can rapidly contact the movable contact with the fixed contact. Further, the moving pusher can be moved with a small external force. Thus, it is possible to minimize the size of the drive source and the power used in the drive source.

Abstract: A method for production of a pole part of a medium-voltage switching device, and a pole part are provided. To obviate costly pressure reinforcements at least on the switching contact side of the vacuum interrupt chamber in the area of the mold core, while also achieving an optimum injection-molded result, a compensation ring is positioned, before the encapsulation process, as a separate injection-molded seal on or close to the external circumferential line of a vacuum interrupt chamber cover, between the lower cover of the vacuum interrupt chamber and the mold core. The positioned compensation ring is also encapsulated so as to remain in the encapsulation, and the mold core is then removed.

Abstract: Devices and assemblies are provided for operating circuit interrupters. A circuit interrupter assembly includes a circuit interrupter and a contact spring assembly. The circuit interrupter is located within the housing and includes a moving contact and a stationary contact. Contact spring assembly includes a mass, a plunger, a ferrule, a spring, and a dielectric drive rod. The mass defines an inner bore with a first diameter at a first portion of the mass and a second diameter that is larger than the first diameter at a second portion of the mass. The plunger has a flange portion and a body portion. The flange portion is located within the inner bore at the second portion and has a flange diameter that is larger than the first diameter. The spring is disposed within the inner bore between the plunger and the ferrule.

Abstract: A magnetic actuating device (1) for a current switching device (2) comprises: —a ferromagnetic stator (3) and a ferromagnetic armature (4) which is movable between a first end position (5), which is close to the ferromagnetic stator (3), and a second end position (6) which is spaced apart from the ferromagnetic stator (3), —a compression spring (7)configured for urging the ferromagnetic armature (4) to the second end position (6), —an electrical coil (8) energizable for electromagnetically attracting the ferromagnetic armature (4) to the first end position (5), and —a mechanical locking assembly (10) configured for releasably blocking the ferromagnetic armature (4) in the first end position (5).

Abstract: An insulating cylinder and a main circuit structure using the insulating cylinder includes a main cavity, a secondary grounded insert connected with the main cavity, an arc-distinguishing chamber connected with the main cavity, and an outlet terminal insert connected with an end of the arc-distinguishing chamber. An observation window is provided at a side of the main cavity. A main circuit structure using the insulating cylinder, which further includes a main grounded rod and a main grounded contact positioned in the main cavity, an arc-distinguishing chamber insulating pole, an isolated insulating pole, an isolated conductive block, an isolated rod and an isolated contact, and a main bus-bar bushing connected with the isolated contact. A flexible connection is provided between the main grounded contact, the arc-distinguishing chamber and the isolated conductive block.

Abstract: The present invention relates to a ring main unit circuit breaker equipped with a contact force controller, and particularly, to a ring main unit circuit breaker equipped with a contact force controller, capable of controlling a contact force between contacts of a vacuum interrupter, by controlling an interval between the contacts, through a simple manual operation from outside, without having a disassembly operation.

Abstract: A flexible shunt for a vacuum circuit breaker can have a reduced straight length and improved flexibility even with an increased thickness within a predetermined accommodation space of a main circuit part. The flexible shunt comprises a pair of conductive plates, each including a clamp connecting portion configured as a flat conductive member, the clamp connecting portion being connected the clamp, a terminal side connecting portion configured as a flat conductive member, the terminal side connecting portion being connected to the terminal side, and a flexible curved portion configured to connect the clamp connecting portion to the terminal side connecting portion, the flexible curved portion being formed to be projected outwardly.

Abstract: The present invention relates to an on-load tap changer for uninterrupted switching between different winding taps of a tapped transformer according to the first claim. The general inventive concept is that of arranging the on-load tap changer on the underside of the transformer cover by means of a gear module.

Abstract: A guide assembly for a switchgear assembly is provided. The guide assembly includes an elongated support member and a passage. The support member is coupled to and extends from a housing assembly rear sidewall. The support member extends in the circuit breaker assembly direction of travel. The passage is disposed on the circuit breaker assembly base and also extends in the circuit breaker assembly direction of travel. The support member is substantially aligned with the passage. In this configuration, as the circuit breaker assembly moves between a withdrawn position and an installed position, the support member moves between a first position, wherein the support member is not disposed in the passage, and a second position, wherein the support member is partially disposed in the passage. When the support member is in the second position, the support member bears a portion of the weight of the circuit breaker assembly base.

Abstract: In a vacuum circuit breaker corresponding to three-phase, which is configured by linearly arranging three pressure tanks respectively corresponding to one-phase, in which insulation gas is encapsulated, and a vacuum valve is installed, each pressure tank has a nearly longitudinal shape or a nearly square shape, viewed from a plane surface, and the vacuum valve is arranged in each of the pressure tanks in a state where a drive direction of the movable conductor is aligned with an upper lower direction, and the movable conductor is positioned lower than the vacuum valve, and keeps a sufficient insulation distance with respect to the movable-side connection conductor, and is neared to a position in one of diagonal directions or longitudinal directions of the pressure tank having a nearly square shape or nearly ellipsoidal shape, and moreover, the operation mechanism is arranged and configured at a position, which is lower than the vacuum valve.

Abstract: Disclosed are a power transmission device for a vacuum interrupter, and a vacuum breaker having the same. The device includes: a driving link coupled to an adjuster; a driven link coupled to a movable electrode of a vacuum interrupter; connection links configured to connect the driving link and the driven link with each other, and coupled to the driving link and the driven link such that an interval between the driving link and the driven link is varied; cams coupled to the connection links in a perpendicular direction; and cam guides having guide recesses for slidably coupling the cams, and configured to guide the interval between the driving link and the driven link to be changed.

Abstract: Disclosed is a switchgear including: a vacuum chamber; a fixed electrode having a fixed contact at an end thereof, the fixed contact being disposed within the vacuum chamber; a movable electrode having a movable contact at an end thereof, the movable contact being disposed within the vacuum chamber; a linkage assembly electrically connecting or disconnecting the movable electrode and the fixed electrode; an engaging coil spring; and a disengaging coil spring. The engaging coil spring and the disengaging coil spring are provided such that centers of the diametric directions thereof are substantially coaxial and at least a part of the engaging coil spring and a part of the disengaging coil spring overlap each other.

Abstract: An electromagnetic actuator comprising a core moving between a latched position and an open position, a permanent magnet, a coil designed to generate a first magnetic control flux to move the core from an open position to a latched position, and a second magnetic control flux designed to facilitate movement of the moving core from the latched position to the open position. The permanent magnet is positioned on the moving core so as to be at least partly outside the fixed magnetic circuit in which the first magnetic control flux flows in the open position, and to be at least partly inside the fixed magnetic circuit used for flow of a magnetic polarization flux of the magnet in the latched position.

Abstract: The vacuum switch is compact, requires little effort, and provides a reliable current path having a high current-carrying capacity between the terminals of the vacuum switch, particularly at high switch-on speeds. The vacuum switch has a vacuum chamber, in which a vacuum is present and in which a switching contact is arranged. The switching contact includes a fixed contact piece firmly connected to the vacuum chamber and in electrical contact with a fixed contact terminal, and a moving contact piece movably guided relative to the fixed contact piece. The moving contact piece is at a distance to the fixed contact piece in a disconnect position and contacts the latter in a contact position. A drive unit produces a drive movement. A switching mechanism is connected to the drive unit and the moving contact piece and includes a conductor section that is electrically conducting up to the moving contact piece.

Abstract: A switchgear assembly module has a housing, which forms a common gas space for accommodating an insulating gas for the switchgear assembly module. The switchgear assembly module includes a busbar conductor arrangement having three busbar conductor sections, which are accommodated in the common gas space, an outgoing conductor connection group with three outgoing conductor openings and with three outgoing conductor sections, which extend from within the housing towards a respective one of the outgoing conductor openings, and three switch disconnectors, which each connect a respective one of the busbar conductor sections to a respective one of the outgoing conductor sections via a disconnection point. The disconnection point of a first one of the switch disconnectors is arranged on a first side of an outgoing normal plane and the disconnection point of a second one of the switch disconnectors is arranged on a second side of the outgoing normal plane.

Abstract: Exemplary embodiments are directed to a method for producing a circuit-breaker pole part that includes an external insulating sleeve made of a solid synthetic material for supporting and housing a vacuum interrupter insert for electrical switching a medium-voltage circuit. An adhesive material layer at least on the lateral area of the interrupter insert is applied and the coated interrupter is embedded by molding with the solid synthetic material in order to form a single layer of the surrounding external insulating sleeve.

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: An electromagnetically operated switching device according to the present invention includes a pair of electromagnetically operated mechanisms for driving a main circuit contact of a switch via a link mechanism symmetrically arranged with respect to an operational center axis, and a length of a spring retaining plate can be regulated in accordance with a change of a link ratio, which is caused by a design change of the main circuit contact.

Abstract: A switchgear includes an earthing and disconnecting switch which linearly moves and is switchable to a disconnecting and an earthing positions, a vacuum valve which performs closing and breaking of a current in a vacuum container producing vacuum inside, and a solid insulator with which the earthing and disconnecting switch and the vacuum valve are covered, therein the earthing and disconnecting switch and the vacuum valve are electrically connected, and closing and breaking of a current is performed in the vacuum valve.

Abstract: An electromagnet mechanism is coaxially disposed with a vacuum interrupter that is disposed in a circuit breaker, and has a movable core and a fixed core facing each other and an electromagnetic coil that makes the movable core and the fixed core separate or come into contact in response to electromagnetic force. A driving rod which is movably disposed in the axial direction of the electromagnet mechanism is coupled to the movable core, and in which one side is coupled to the circuit breaker and the other side passes through an opening side end plate of the electromagnet mechanism to be extended outward from the opening side end plate of the electromagnet mechanism. An indication unit is disposed on the opening side end plate of the electromagnet mechanism, and indicates a state of the circuit breaker in conjunction with the movement of the driving rod.

Abstract: A three-phase vacuum interrupter switch assembly for power distribution systems comprises an outer case having at least one window, a plurality of internal disconnect switch assemblies, and a plurality of vacuum interrupter bottle switch assemblies within the case. Each vacuum interrupter bottle switch is coupled in electrical series with a corresponding internal disconnect switch assembly. Because the open/closed state of a bottle switch is not directly observable owing to its sealed interior, a direct visible indication of the state of the three-phase vacuum interrupter switch assembly is provided by a visually detectable contact rod for each internal disconnect switch that is visible through the case window. To prevent potentially serious damage caused by arcing between the contacts of the internal disconnect switch, the internal disconnect switch is prevented from opening or closing when the bottle switches are closed. The case interior is preferably free of oil and/or SF6 gas.

Abstract: The disclosure relates to a switching device with a vacuum interrupter chamber in which at least one moving contact piece is arranged. To considerably increase the switching rating and the dielectric strength, the disclosure proposes that two series-connected contact arrangements with a total of two contact levels which can be opened are arranged within a vacuum interrupter chamber.

Abstract: A switching installation including a gas-filled enclosure, an input conductor, an actuator and a short-circuit device. The actuator is arranged to actuate the short-circuit device upon the occurrence of a first arc in the enclosure. The short-circuit device creates, upon being actuated, a short-circuit through the solid insulation between the input conductor and the enclosure or a separate ground point. The actuator can be arranged to react on an increase in pressure in the enclosure upon the occurrence of the first arc. The gas can be air or SF6. The short-circuit device can create, upon being actuated, the short-circuit through a section of a solid cable insulation isolating the input conductor from the enclosure.

Abstract: Disclosed is a vacuum circuit breaker. As a plurality of components of main circuit units are integrally formed as one module by molding using epoxy, the main circuit units are easily fabricated, and assembly errors are prevented. Since the main circuit units are arranged to be symmetrical to each other based on a driving unit, an insulation distance between a switchgear and the main circuit units can be obtained without increasing a size of the switchgear. This may allow the main circuit units to be easily arranged at the right side or at the left side according to an installation state of the switchgear.

Abstract: The embodiments of the switch described herein include latching and locking systems so as to retain the rod of a vacuum bottle in a determined, open or closed, position, the systems being driven and controlled by the same means that cause the movable portion of the vacuum bottle to move, or by the disconnector itself.

Abstract: The present disclosure provides a pole part of a low-voltage, medium-voltage and/or high-voltage switching device. The pole part includes a vacuum interrupter chamber having a fixed contact and a movable contact, which includes an electrical contact piece. The vacuum interrupt chamber is cast into an insulating material. The insulating material has opening at the bottom in at least one of a region of the movable contact and a drive rod driving that drives the movable contact. To reduce the heating of the pole part to enable production of a higher rated current carrying capacity, in the region of the movable contact and/or the articulation point of the drive rod, at least one ventilation opening is formed to pass through at least one of an exterior wall of the insulation, a boundary zone between the insulation and the electrical connection piece, and the electrical connection piece.

Abstract: A vacuum valve includes a fixed side electrode on a fixed side current-carrying shaft and a movable side electrode on a movable side current-carrying shaft. An opening and closing unit is coaxially disposed with the movable side current-carrying shaft, and drives the movable side current-carrying shaft. A chattering suppression structure is coaxially disposed with the fixed side current-carrying shaft on the fixed side of the vacuum valve, and suppresses chattering. The opening and closing unit includes an electromagnetic operating mechanism which drives the movable side current-carrying shaft when energized. A contact pressure spring is coaxially disposed with the electromagnetic operating mechanism, and applies contact pressure between the movable side electrode and the fixed side electrode during contact closing of the vacuum valve.

Abstract: Exemplary embodiments of the present disclosure are directed to a method for producing a circuit-breaker pole part by molding an external insulating sleeve with insulation material, mounting a vacuum interrupter insert inside the insulating sleeve, electrically connecting the vacuum interrupter insert with an upper electrical terminal and a lower electrical terminal arranged in the wall section of the insulating sleeve The method also includes molding the external insulating sleeve, wherein only the upper electrical terminal is embedded in the insulation material, coating the vacuum interrupter insert with an extra layer made of insulation material for thermo extension compensation, mounting the coated vacuum interrupter insert by screwing on a threaded bolt onto the upper electrical terminal.

Abstract: A vacuum switching device with pre-insertion contact arrangement is disclosed. The vacuum switch includes first and second contact systems. The first contact system includes an annular stationary contact and an annular moving contact retained on a moving contact drive rod. A second contact system includes a moving contact retained on an end of the moving contact drive rod and a floating contact retained along the same axis as the second moving contact. Both contact systems are enclosed in a vacuum envelope. A mechanical adjustment system is provided for the floating contact, which allows it to be positioned so that the secondary moving contact and floating moving contact may engage at a set interval before the annular moving contact engages the annular stationary contact. A resistor or inductor is connected between the second contact system and a load to prevent a current in-rush into the load.

Abstract: Vacuum circuit breakers are to gain an extended lifetime by reducing contact face damage of moving and fixed electrodes with improved voltage withstand performance therebetween and enhanced interruption performance. Vacuum circuit breaker of the present invention has bulb 10 having: insulative vacuum tube 11; and fixed electrode 12 on end of current-carrying conductor 13 and moving electrode 15 on end of another current-carrying conductor 16 arranged in insulative vacuum tube 11 with their electrode contact faces opposed each other. Operation system for manipulating current-carrying conductor 16 of moving electrode 15 is equipped with compression-spring 20 and auxiliary compression-spring 21 that increases initial opening speed of moving electrode 15. Auxiliary compression-spring 21 ceases energizing in the middle of a circuit breaking movement of moving electrode 15 and begins storing spring energy in the middle of a circuit closing movement of the same.

Abstract: Insulated vacuum switchgear and active switchgear elements therefor are provided with a rigid support structure mechanically isolating a vacuum insulator from axial loads in use without reinforcing or insulating encapsulations. At least one of the elastomeric insulating housing and the support structure directly contacts an outer surface of the insulator. Systems and methods for assembling the switchgear are also provided.