Abstract: Insulated vacuum switchgear and active switchgear elements therefor are provided with a composite overwrap for mechanically isolating a vacuum insulator from axial loads in use without reinforcing or insulating encapsulations. A dielectric buffer layer is provided to fill voids or discontinuities in the overwrap.

Abstract: A switching device is disclosed which includes a frame, a first connector and a second connector, the first connector and the second connector extending from inside the frame outside the frame. The first and the second connector are electrically connected to one another, and one or more gas flow openings are provided in the frame and arranged for a gas flow produced by a switching event. In its portion remaining inside the frame, the first connector includes a hole provided for said gas flow.

Abstract: An arc chute assembly includes a housing having a lateral axis and a quenching portion disposed within the housing. The quenching portion includes at least two deion plates being spaced along the lateral axis of the housing and each having a cut portion wherein the cut portions are staggered along the lateral axis with respect to one another and are configured to mitigate an arc.

Abstract: A switchgear having interrupters wherein at least two moving contacts are capable of being open and close with respect to respective fixed contacts. The switchgear comprises a non-earthed metal vacuum chamber enclosing the interrupters therein, a connection conductor for connecting the moving contacts, an operating rod connected to the connecting conductor by means of an insulator and protruding from the non-earthed metal vacuum chamber, a sealing means for sealing the protrusion of the operating rod at the non-earthed metal vacuum chamber, circuit terminals protruding from the non-earthed vacuum chamber, an earth layer surrounding an outer periphery of the insulating mold, and a potential control means. The control means for controlling the potential of the non-earthed metal vacuum chamber is connected between the circuit terminals and is connected to the non-earthed metal vacuum chamber at the intermediate point of the potential control means.

Abstract: A switchgear having interrupters wherein at least two moving contacts are capable of being open and close with respect to respective fixed contacts. The switchgear comprises a non-earthed metal vacuum chamber enclosing the interrupters therein, a connection conductor for connecting the moving contacts, an operating rod connected to the connecting conductor by means of an insulator and protruding from the non-earthed metal vacuum chamber, a sealing means for sealing the protrusion of the operating rod at the non-earthed metal vacuum chamber, circuit terminals protruding from the non-earthed vacuum chamber, an earth layer surrounding an outer periphery of the insulating mold, and a potential control means. The control means for controlling the potential of the non-earthed metal vacuum chamber is connected between the circuit terminals and is connected to the non-earthed metal vacuum chamber at the intermediate point of the potential control means.

Abstract: An exemplary encapsulated high-voltage switch is disclosed which contains a heat-generating current conductor, a metal encapsulation surrounding the current conductor, and a cooling element. A cooler of the cooling element is fixed on a part of the encapsulation that is embodied as a mounting plate, and has cooling ribs arranged outside the encapsulation. In a section of the cooler that is embodied as a cooling block, at least a portion of the cooling ribs is arranged parallel to the mounting plate and is held on a heat distributor fixed to the mounting plate in such a way that on both sides of the heat distributor in each case one of two groups of cooling channels arises, in which the cooling channels are in each case arranged in the manner of a sandwich. The cooling channels can, for example, be oriented in a manner inclined relative to a horizontal axis of the switch.

Abstract: A circuit breaker includes a pivoting arc barrier that is interposed between the moving contact arm axis of motion and the moving contact, so that arc gasses are deflected away from the contact arm structure. The pivoting arc barrier pivots in a complimentary motion path with that of the moving contact arm so that an arc shield face is interposed between the contact separation arc generated around the moving contact and the remaining arm structure to it which the moving contact is affixed throughout the range of contact arm operational motion. The pivoting arc barrier moves independently of the moving contact arm and advantageously does not increase the contact arm mass or bulk swept volume through its range of motion.

Abstract: A circuit breaker includes an enclosure with a first side and a second side opposite and distal from the first side. A number of separable contacts are enclosed by the enclosure. An operating mechanism is structured to open and close the separable contacts. A plurality of terminals are electrically interconnected with the number of separable contacts. The terminals protrude through the second side of the enclosure. A number of phase barrier apparatus is disposed on the second side of the enclosure. Each of the number of phase barrier apparatus includes a plurality of separate phase barrier members, each of which is disposed about a corresponding one of the terminals, and a number of interlocking members. Each of the number of interlocking members interlocks with an adjacent pair of the separate phase barrier members.

Abstract: In order to reduce the breaking energy of a high-voltage or medium-voltage circuit-breaker, the interrupting chamber (10) contains two contacts (12, 14) mounted to move in opposite directions, and actuated via a single device (20). The two contacts (12, 14) are surrounded by an insulating casing (18) of tubular shape, coupled in fixed manner to the main contact (12). The contacts (12, 14) are actuated by a device having a lever (24) in which each lever arm is coupled to a link, one of the links (32) being secured to the insulating casing (18) and the other link (34) being secured to the second contact (14). The guiding of the drive tube (18) on the main contacts (12b, 14b) makes it possible to improve breaking by keeping clean gas between said main contacts.

Abstract: An electrical switch which includes an insulative housing having a wall defining an axial bore therein, a first electrical contact disposed in the housing bore and a second electrical contact movably disposed in the housing bore between an open position and a closed position. When the contacts are in their open position, the second electrical contact is spaced apart from the first electrical contact and when the contacts are in their closed position, the second electrical contact is in electrical contact with the first electrical contact. The switch includes features to enhance safety and operation by reducing the possibility of arcing or flashover before and during the switching operation and to provide of visual indication of the state of the switch.

Abstract: In a gas-insulated power apparatus in which contiguous vessels 11, 12 (GIBC1, GIBC2) are coupled by way of flanges 111, 121 of respectives thereof, and power conductors 112, 122 (GIBC5) insulated from the vessels by an insulating gas 13 are included in the vessels, by squeezing the flange 111 of the vessel on one side to be coupled by a pressing member 14 screwed to the flange 121 of the vessel on other side and the flange 121 of the vessel on other side, positions of the vessel on one side and the vessel on other side coupled as described above relative to each other can be shifted in a peripheral direction of the flange, and therefore, even when a direction of leading out a gas-insulated bus or the like becomes various depending on products, various directions can be dealt with out depending only on design of respective product specifications.

Abstract: An electrical switch which includes an insulative housing having a wall defining an axial bore therein, a first electrical contact disposed in the housing bore and a second electrical contact movably disposed in the housing bore between an open position and a closed position. When the contacts are in their open position, the second electrical contact is spaced apart from the first electrical contact and when the contacts are in their closed position, the second electrical contact is in electrical contact with the first electrical contact. The switch includes features to enhance safety and operation by reducing the possibility of arcing or flashover before and during the switching operation and to provide of visual indication of the state of the switch.

Abstract: A seal assembly for an electrical enclosure having a draw-out circuit breaker and a number of conductors is provided having a movable first seal member and a movable second seal member. The circuit breaker includes a protruding nose portion that is engaged by the first and second seal members in a manner that sealingly engages the nose portion. The arrangement of the first and second seal members and the nose portion provides for the sealing engagement to be maintained when the circuit breaker is moved from a first position in which the circuit breaker is not electrically connected to the number of conductors and a second position in which the circuit breaker is electrically connected to the number of conductors.

Abstract: A switchgear assembly module is disclosed. The switchgear assembly module is for controlling and monitoring at least one electrical load in an outgoer of a low-voltage switchgear assembly, and has at least one communication interface for connection to a bus system, and a programmable controller and having configurable protective functions. The switchgear assembly module is formed from interchangeable components and has at least one central unit as well as at least one bus connection unit with a communication interface. Additional connection slots are provided for holding at least one power unit and at least one input/output unit. An internal bus is provided for communication from the central unit with the other components for the central unit to process data received from the other components which are located in the switchgear assembly module.

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.

Abstract: An electrical switch which includes an insulative housing having a wall defining an axial bore therein, a first electrical contact disposed in the housing bore and a second electrical contact movably disposed in the housing bore between an open position and a closed position. When the contacts are in their open position, the second electrical contact is spaced apart from the first electrical contact and when the contacts are in their closed position, the second electrical contact is in electrical contact with the first electrical contact. The switch includes features to enhance safety and operation by reducing the possibility of arcing or flashover before and during the switching operation and to provide of visual indication of the state of the switch.

Abstract: An electrical device for low-voltage applications that comprises at least one fixed contact designed to connect to a corresponding mobile contact; the electrical device also comprises at least one module, on which said fixed contact is housed, and the module is operatively connected to a structural part of the device and is at least partially separable from said structural part.

Abstract: The gas insulated switchgear includes a rotary shaft which penetrates a pressure vessel is connected with a moving part which is housed in the pressure vessel by way of a lever, and is connected to the moving part, and brackets which support the rotary shaft and are mounted on a mounting portion which is formed on the pressure vessel. The brackets are fixed to the mounting portion formed on the pressure vessel using a plurality of fixing bolts which are arranged in a spaced-apart manner on an eccentric circle having the center at a point x2 offset from the center of rotation x1 of a rotary shaft and hence, the brackets can be fixed to the mounting portion formed on the pressure vessel at a predetermined angular position which uses the point x2 offset from the center of rotation x1 of the rotary shaft as the center of rotation.

Abstract: A shielded encapsulated vacuum interrupter with a ceramic vacuum chamber and opposing conductive end caps is provided. One end cap is electrically connected to a fixed contact, while an opposing end cap is connected to a moving contact. The moving contact is actuatable with the fixed contact for opening or closing an electric circuit. A floating shield inside the vacuum chamber connected to the vacuum chamber ceramic wall and spaced from the fixed and moving contacts is isolated and has a floating voltage potential. A portion of the vacuum chamber exterior ceramic wall is coated with a semi-conductive material and conductive voltage screens enclose a portion of the vacuum chamber exterior and are electrically connected to each conductive end cap of the vacuum chamber. The chamber and connected screens are encapsulated in a molded dielectric housing.

Abstract: The high-voltage switching device used in one installation position and has metallic encapsulation (10) a switching gap (4) and a particle trap (1) for holding foreign body particles (2), and is characterized in that in the one installation position, the particle trap (1) is arranged vertically underneath the switching gap (4), in the one installation position, an isolator part (8) is provided, which has a surface (8a) aligned essentially horizontally and faces the interior of the high-voltage switching device, with a metallic wall (9), which is higher than the particle trap (1; 1?), being arranged between the isolator part (8) and the particle trap (1; 1?). The particle trap (1) has a viewing window (3). If the high-voltage switching device is a disconnector, this viewing window (3) may be identical to the viewing window (3) for visual access to the visible disconnecting gap (4) of the disconnector.

Abstract: The invention proposes an electrical service device, in particular line circuit breaker or motor circuit breaker, having a housing having connection means (20, 21) for the purpose of connecting busbars and/or connection lines on at least one end side, having at least one switching contact having a fixed and a movable switching contact piece, an arc (6) being produced in an arc prechamber area (5) between said fixed and movable switching contact pieces in the event of a disconnection, said arc entering a current-limiting arc-quenching device (7) via arc guide rails. Prechamber plates (9, 12) are arranged in the region of the arc prechamber area (5), return-flow channels (10, 13) being formed by said prechamber plates (9, 12) from the arc-quenching device (7) to the arc prechamber area (5) between the housing wall (2) and the prechamber plates (9, 12).

Abstract: Disclosed is a vacuum switchgear comprising an electro-conductive outer vacuum container, a plurality of inner container disposed in the outer vacuum container. The inner containers and the outer container are electrically isolated from each other. The outer container is made of stainless steel plate, for example. One of the inner vacuum containers accommodates a ground switch for keeping the circuit open while the switchgear is opened, having a movable electrode connected to an operating mechanism, and a fixed electrode connected to fixed electrode rod. Another inner vacuum container accommodates a function switch capable of having at least one of functions of a circuit breaker, a disconnector and a load switch. A plurality of electrode shields each surrounds the electrodes of the ground switch and of the function switch. The ground switch and the function switch are disposed in separate vacuum inner containers, respectively.

Abstract: A circuit breaker has a molded case with a main case, a middle cover and a top cover being dividable from one another. The main case contains contactor sections, each including a stationary contactor and a movable contactor for a pole corresponding to each phase in a polyphase circuit, an arc-extinguishing device, an overcurrent tripping device actuating a tripping mechanism by detecting an overcurrent, and a zero-phase current transformer detecting a leak current. The middle cover has a partitioned recess for containing a switching mechanism and the tripping mechanism. Interpole partitions, surrounding the contactor section and the arc-extinguishing device, and a screen-like intermediate partition, isolating the contactor sections from the overcurrent tripping device, are formed with the middle cover laid on the main case. A wall with gas outlets for an arc gas is provided on the back of the arc-extinguishing devices.

Abstract: A current interrupter assembly includes an insulating structure, a current interrupter embedded in the structure, a conductor element embedded in the structure, a current interchange embedded in the structure and connected to create a current path between the current interrupter and the conductor element, and a semiconductive layer covering at least a portion of the conductor element so as to reduce voltage discharge between the conductor element and the structure.

Abstract: Disclosed is a vacuum switchgear comprising an electro-conductive outer vacuum container, a plurality of inner container disposed in the outer vacuum container. The inner containers and the outer container are electrically isolated from each other. The outer container is made of stainless steel plate, for example. One of the inner vacuum containers accommodates a ground switch for keeping the circuit open while the switchgear is opened, having a movable electrode connected to an operating mechanism, and a fixed electrode connected to fixed electrode rod. Another inner vacuum container accommodates a function switch capable of having at least one of functions of a circuit breaker, a disconnector and a load switch. A plurality of electrode shields each surrounds the electrodes of the ground switch and of the function switch. The ground switch and the function switch are disposed in separate vacuum inner containers, respectively.

Abstract: The invention relates to an electrical installation, especially a medium-voltage switchgear, comprising at least one encapsulated function module (FM), a decompression channel (DK) which is connected to said function module, and at least one inflow opening (EO . . . ) which connects the function module (FM) to the decompression channel (DK). The covering surface (DF 1,2,3) of the decompression channel (DK), opposite the inflow opening (EO . . . ), comprises at least one partial region which is obliquely oriented in relation to the inflow direction. Hot gases and high pressures produced during an accidental arc can thus be evacuated from the installation, without any risk to humans and buildings. Pressure channels are used, inter alia, in installations used in relation to medium-voltage technique for providing and distributing energy.

Abstract: The high-power switch (1) according to the invention, with at least one switch pole (2) for guiding and switching an electric current which flows in one current flow direction when the switch is in the closed state, with the at least one switch pole (2) containing an inner conductor (3) which carries the current and containing an outer conductor (4) which is connected to ground potential (G) and carries a return current in the opposite direction to the current, with the outer conductor (4) being in the form of a housing (4) which surrounds the inner conductor (3), is characterized in that a cooling rib arrangement (5) which contains cooling ribs (9) is arranged on the outer conductor (4). At least some of the cooling ribs are advantageously arranged on a separate part of the housing (4), which is not the same as the part (15) of the housing (4) which is at a minimum distance from the inner conductor (3).

Abstract: A circuit breaker vents at least some of the arc gases generated during current interruption from an internal cavity containing separable contacts through a terminal recess vent in a wall in the housing into an external terminal recess. The line side main conductor extends through the same wall into the external terminal recess adjacent the vent and into the collar of a terminal assembly. An electrically conductive stand seated on the main conductor electrically connects to the main conductor an external conductor clamped against the stand by a terminal screw threaded through the collar. The stand has a through opening aligned with the terminal recess vent to pass the arc gases through the external terminal recess to atmosphere.

Abstract: A switching gas damper for low-voltage power circuit breakers, is arranged as an attachment above the arcing chambers for additional damping, deionization and cooling of the switching gases. The switching gas damper includes a cuboid enclosure with separate inlet openings to receive switching gas flows from each arcing chamber in the low-voltage power circuit breaker. Separate outlet channels are formed by channel walls and/or by deflection elements and are routed on both sides of the power circuit breaker. A variable arrangement of the deflection elements and outlet channels makes it possible to produce a number of mutually separate flow paths, with different desired damping and cooling characteristics, as a function of the gas amounts that occur and of the characteristics of the arcing chambers that are used.

Abstract: A current interrupter assembly includes an insulating structure, a current interrupter embedded in the structure, a conductor element embedded in the structure, a current interchange embedded in the structure and connected to create a current path between the current interrupter and the conductor element, and a semiconductive layer covering at least a portion of the conductor element so as to reduce voltage discharge between the conductor element and the structure.

Abstract: A tank filled with an insulating gas accommodates insulator tubes incorporating vacuum-valve breakers for individual phases. One end of each insulator tube is fixed to the inside of the tank. Each vacuum-valve breaker is installed generally on a common longitudinal axis with the corresponding insulator tube so that a movable electrode rod is directed toward a fixed end of the insulator tube. The insulator tube has as an integral part a bus line fixing portion projecting in a direction intersecting the longitudinal axis of the insulator tube from the proximity of an end opposite to the fixed end, supporting a bus-side conductor in an insulated fashion.

Abstract: A chamber cover fixing is for arc quenching chambers for low voltage switchgears operating in air. The arc quenching chamber cover is fixed to the arch quenching chamber, by use of interlocking guide and lock elements, without the use of screws. In addition to the sliding guide elements in the arc quenching chamber housing and in the arc quenching chamber cover, one or several clips or locking grooves for engaging the clips are provided.

Abstract: The present invention provides an electromagnetic relay that has a long service life, even when being used for interrupting high voltage, and that can be miniaturized. In this electromagnetic relay, the circuit interruption is cut-off by two or more keying circuits, which are operated by a single coil and connected in series. Thus, an amount of generated arc per keying circuit is suppressed. Consequently, the service life of the electromagnetic relay is lengthened. Moreover, the space between the contracts thereof is reduced, so that the electromagnetic relay is miniaturized. Additionally, a magnetic field for extinguishing arc is formed by a back or counter electromotive force generated when the circuit is cut-off. Thus, the generated arc is extinguished.

Abstract: In an integrated type gas-insulated switching apparatus, a plurality of switching devices are provided. Each of switching devices includes a contact and an insulated container in which the contact is contained. The contact comprises electrodes adapted to be contacted with each other and separated therefrom. The insulated container is filled with an insulating gas. A conductive container is provided, to which the plurality of switching devices are connected, respectively. An insulated structure supports the conductive container.

Abstract: Apparatus (10) for interrupting the flow of current in a power distribution system is disclosed for use with an enclosure containing insulating fluid. The apparatus (10) includes a housing (20) formed from insulating material and having a mounting flange (28) formed along the exterior of the housing (20). The flange (28) is located so that the housing extends away from the mounting side and the upper side of the flange. An electrical current interrupter (16), having electrical input and output ends (16a, 16b), is positioned in the housing (20) so that a portion lies within the portion of the housing extending away from the flange mounting side. An actuator (12) is mechanically connected to the interrupter (16) to provide the mechanical actuation required to interrupt the current flow between the input and output ends of the interrupter. When the flange (28) is attached to the enclosure, the portion of the housing (20) extending away from the flange mounting side extends into the fluid within the enclosure.

Abstract: An arc-extinguishing system for a contact switching apparatus having a plurality pieces of grid plate for arc extinction arranged outside the contact switching apparatus so as to be substantially vertical to a movable contact, and an arc box as well as an arc cover for covering the contact switching apparatus as well as arc-extinguishing grid plates, in which a thin-plate rib extending in a direction of an array of the arc-extinguishing grid plates is provided on the arc cover made of resin having elasticity, and the arc-extinguishing grid plates are fixed to the thin-plate rib by being pressed against end surfaces of the arc-extinguishing grid plates through connecting of the arc box to the arc cover.

Abstract: A presently-preferred capacitor discharge system for a circuit breaker adapted for use in a switchgear enclosure comprises a capacitor discharge circuit adapted to be electrically coupled to the capacitor, and a contact switch electrically coupled to the capacitor discharge circuit and adapted to be mechanically coupled to a support truck of the circuit breaker. The contact switch is movable between a first and a second position. The system also comprises a resistor electrically coupled to the capacitor discharge circuit, and a lever arm adapted to be rigidly coupled to a racking mechanism of the circuit breaker and adapted to urge the contact switch into the closed position when a locking arm of the racking mechanism disengages from the switchgear enclosure. The capacitor discharge system is adapted to electrically couple the capacitor and the resistor when the contact switch is in the second position thereby discharging the capacitor.

Abstract: A low-voltage circuit breaker (1) has an arc-extinguishing chamber (2) and a switching gas damper (4) which consists of two partial bodies (6, 7) that are displaceable in relation to each other. One (6) of the partial bodies (6, 7) is fixed to the circuit-breaker (1), while the other (7) is pre-stressed against the first partial body (6) with an elastic restoring force (spring 12). The switching gases that; are discharged from the arc-extinguishing chamber (2) are contained inside (8) the switching gas damper (4) until the relative displacement of the partial bodies (6, 7) forms a flow outlet through which the switching gases can escape.

Abstract: The present invention provides a wire lug arc vent barrier for protecting a wire lug in a molded case circuit breaker, with the circuit breaker having a housing with a terminal for a load connection and a terminal for a line connection. The wire lug/arc vent barrier comprises a body having a first end including a tang, a second end including an elongated finger and a middle portion between the first end and the second end defining a concave space, with an opening at each of the middle portion, wherein the body is mounted in the housing.

Abstract: A switchgear cabinet includes a plurality of securing apparatuses that are mounted on a vertical flange of the switchgear cabinet, with the securing apparatuses each being formed with a locking hole that is engageable by a pin of a locking mechanism on a door member. Each securing apparatus includes an anchor plate connected with a first bracket and a second bracket, with the first and second brackets being mounted on the flange of the switchgear cabinet. The locking hole is formed in the anchor plate, and the anchor plate is substantially planar and free of bends. The anchor plate further is generally U-shaped and is configured to extend generally around at least a portion of the flange.

Abstract: A vacuum circuit interrupter for use in a switchgear connectable to a three-phase ac power system and having for each phase a vacuum valve including a pair of separable electrodes supported within a hermetic vessel by an electrode. Axes of the vacuum valves for three phases are arranged in parallel and at apexes of a triangle. Electrically insulating barriers are disposed for supporting and electrically insulating the vacuum valve from another vacuum valve in another phase and from the hermetic vessel.

Abstract: A pressure sensitive trip mechanism for actuating a circuit breaker operating mechanism to trip a circuit breaker includes a trip lever and a trip bar. The trip lever is rotatable about a first pivot. The trip bar is positioned proximate the trip lever. The trip bar is arranged to rotate about a second pivot in response to a predetermined level of pressurized gas created by separation of the pair of electrical contacts, thereby urging the trip lever to unlatch the circuit breaker operating mechanism. The pressure sensitive trip mechanism provides for very fast tripping of the circuit breaker in the event of a short circuit condition or an overcurrent fault condition within any one on the circuit breaker poles. In a multi-pole circuit breaker, the present invention provides for protection against single-phasing.

Abstract: In a hybrid type gas insulation switch gear apparatus, a main enclosure including a first cylindrical section have a base and a second cylindrical section branched from the base. A bushing is mounted on the cylindrical section and including a hollow insulating housing having a housing space and a central conductor extended in the hollow insulating housing. A first insulating spacer is provided in the first cylindrical section and configured to separate the first hollow space into first and second segment spaces. An insulating enclosure is also mounted to the second cylindrical section and including an enclosure space. A second insulating spacer is provided between the insulating enclosure and the second cylindrical section and configured to separate the enclosure space from the second hollow space. A disconnecting switch is formed in the first segment space of the first cylindrical section and a circuit breaker is also formed in the insulating enclosure.

Abstract: A vacuum switch is composed by installing a vacuum circuit-breaker and a disconnector in different grounded vacuum vessels, respectively, and a vacuum-measurement device is attached to each grounded vacuum vessel. The above vacuum vessel communicates with one of the grounded vacuum vessels, and the degree of vacuum in the vacuum vessel can be directly measured and monitored.

Abstract: A multipolar circuit breaker of great breaking capacity prevents arc gas from blowing out from the side at the time of cutting off a short-circuit current. A stationary contact and a movable contact generating arcs when a short-circuit current is cut off, and an arc extinguisher extinguishing the arc are stored in an arc extinguisher casing. By forming the ceiling, the bottom and the sidewalls connecting the ceiling and the bottom of the arc extinguisher casing in continuity so that no gap is formed by an outward internal pressure, blow out of arc gas from the sidewall portion is suppressed.

Abstract: A gas-filled switching apparatus has a gas-filled sealed container having a container body with a neck which surrounds an opening and a flange which extends outwards from the neck. A cover is disposed on the flange to cover the opening, and a gasket is disposed between the cover and the flange to form a seal around the opening. A plurality of clamps detachably secure the cover to the flange. Each clamp includes an adjustable pressing member exerting a clamping force on the cover and the flange.

Abstract: A vacuum switch comprises a first vacuum container containing therein a circuit breaker, a second vacuum container containing therein the first vacuum container and grounded, and a third vacuum container connected to the second vacuum container, containing therein a disconnecting switch and an earth device and grounded. The second and third vacuum containers are isolated in vacuum from the first vacuum container, and the second vacuum container is electrically insulated from the first vacuum container. The second vacuum container contains an insulator fixed to a conductor connected to the circuit breaker and a movable rod partially disposed out of the vacuum containers and operating the circuit breaker to open and close. The disconnecting switch, circuit breaker and the insulator are arranged in a line. A vacuum switchgear comprises the above-mentioned vacuum switches of the number corresponding to three phases and necessary components, each being contained in a metal box.

Abstract: The invention relates to switchgear assemblies having switching devices arranged in housings whose contact bolts can be deflected in a straight line and can be controlled by a magnetic drive device and are guided axially and radially by means of concentrically arranged slotted guides. The housings are formed by mutually opposite pole shells, and the slotted guides are each provided by rotating guides mounted at one end. The rotating guides each have a trapezoidal lever contour and are equipped with guide pins which extend outward and are mounted such that they can rotate in guide recesses in the mutually opposite pole shells. The rotating guides are each provided with a U-shaped bolt bearing in which a guide bolt is mounted. Switchgear assemblies such as this are used in the field of electrical power supply and distribution.

Abstract: A gas-insulated switchgear provided with a resin mold bushing for supporting and insulating a main circuit conductor from a ground tank is miniaturized. A container portion 3a is formed by opening an end inside of the tank of a resin mold bushing 3 for supporting and insulating an internal conductor 7 from a ground tank 1 where a breaker 2 and a disconnector are accommodated. A blade-supporting conductor 5 of the disconnector for joining the internal conductor 7 and the disconnector is installed in the container portion.

Abstract: A current transfer arrangement is provided for a circuit interrupter that provides support for the contacts of the circuit interrupter and also provides current transfer between the contacts of the circuit interrupter and the external circuit terminal connection points directly through the end flanges/fittings thereof. The current transfer arrangement includes a first member assembled onto each of the circuit interrupter contacts and clamping members for securing the first member to the end flange. The end flanges include receiving grooves cooperating with the first member.