Abstract: The switchgear assembly has a polyphase design and has a gas-filled, modular encapsulation for each phase. Provided as the modules are at least one busbar, which is guided predominantly horizontally, a circuit breaker and two combined disconnecting-earthing switches having a disconnection and grounding function. A first one of the combined disconnecting-earthing switches supports a section of the busbar and is connected between the busbar and a first current terminal of the circuit breaker. The second combined disconnecting-earthing switch is connected between an outgoing feeder or a further busbar of the assembly and the second current terminal of the circuit breaker. The combined disconnecting-earthing switches are aligned such that two drive apparatuses, which are provided for their actuation, point in the same, predominantly horizontal direction.

Abstract: An electrical bus member mounting system is provided for an electrical enclosure including a housing having a front, a back and a plurality of sides, a plurality of sections disposed between the sides, at least one electrical apparatus disposed within a first one of the sections, and an electrical bus assembly electrically connected to the electrical apparatus. The electrical bus member mounting system includes a mounting assembly having a first portion and a second portion. A plurality of electrical bus members are coupled to the first portion and the second portion is coupled at or about at least one of the sides of the housing within a second one of the sections thereof. Accordingly, the electrical bus member mounting system consolidates a substantial portion of the electrical bus assembly at a single location within the second one of the sections of the housing, in order to facilitate access thereto.

Abstract: An electrical enclosure includes a housing having a front, a back, a plurality of sides, a plurality of sections disposed between the sides, at least one electrical apparatus, and a plurality of electrical bus members electrically connected to the electrical apparatus. The electrical apparatus is disposed within a first one of the sections of the housing, and a substantial portion of the electrical bus members are collectively disposed within a second one of the sections of the housing. At least the second one of the sections and the substantial portion of the electrical bus members collectively disposed therein are accessible from the front of the housing, regardless of whether the electrical apparatus is within or removed from the first one of the sections of the housing. An electrical bus assembly is also disclosed.

Abstract: For use in switchgear equipment having channel bus bars joined together at a bus joint, there is provided a method of servicing and maintaining a channel bus splice assembly and method. The channel bus splice assembly comprises switchgear or switchboard equipment having channel bus bars joined together at a bus joint, there is provided a channel bus splice assembly. The channel bus splice assembly comprises an inner splice plate defining a plurality of throughbores. A sliding clamp plate is configured to reciprocally move within the inner splice plate. The sliding clamp plate defines a plurality of access ports. A pair of nut plates is coupled to the sliding clamp plate and having threaded orifices corresponding to selected throughbores in the inner splice plate. An outer splice plate having a plurality of throughbores corresponding to the threaded orifices in the nut plates.

Abstract: The substation has at least one outdoor busbar (11, 12) as well as at least two switch bays which can be connected to the busbar and at least one encapsulated, gas-insulated, arrangement of switchgear modules (30) which is arranged in one of the switch bays. This switchgear arrangement contains at least one disconnector module (DS) and at least one circuit breaker module (CB). An installation module (MM) is arranged between the disconnector module and the circuit breaker module and allows lateral removal of at least one of the two switchgear modules (DS, CB). This substation is distinguished by high availability, since each of the most severely loaded components of the encapsulated switchgear arrangement, that is to say the disconnector module and the circuit breaker module, can be removed from the substation by lateral removal without having to change the position of the other components.

Abstract: A switching installation (5) having a circuit breaker (12), which is connected to a cable connection (33), and optionally a disconnector (14) for making or breaking a conductive connection between the cable connection (33) and a rail system (15), and an electrically insulating barrier (10). The electrically insulating barrier (10) surrounds at least the parts which are under electric voltage in operation from the circuit breaker (12) to the rail system (15), including a branch (18) leading to a rail (15) of the rail system, separately for each phase of the switching installation (5). Furthermore, inside the electrically insulating barrier (10) the switching installation may be provided with field-control means and/or voltage-sealing means (22, 25, 37).

Abstract: The invention relates to an improvement to the thermal load capacity of generator switches (20, 21, 22). As is known, radiation plates (5, 50, 51, 52) are used between generator switches (20, 21, 22) for different phases (R, Y, B) for convective dissipation of radiated heat from adjacent encapsulation side walls (30b). According to the invention, in the vicinity of the encapsulation cover (3a) of a generator switch (20, 21, 22), the radiation plate (5, 50, 51, 52) has at least one angled metal sheet (50a) which is used to guide at least one air flow element (9) of the rising air flow (9) in the direction of the encapsulation cover (3a) and in order to direct the flow along the encapsulation cover (3a).

Abstract: An arc resistant switchgear assembly is provided having a front wall, a rear wall, a bottom surface, an upper surface, a first side wall, and a second side wall opposed to the first side wall and spaced a first distance from the first side wall, with each of the first and second side walls having an upper portion and a lower portion, and with each of the first and second side walls having an inner and an outer surface, with at least the lower portion of both the first side wall and the second side wall having at least one blow-off panel detachably secured thereto by fastening means. Each of the panels is detachably secured to the outer surface of the side wall to which each is secured. The assembly has a vertical plenum formed directly adjacent both the first and the second side walls, with the outer surface of each of the first and second side walls defining an inner side wall of each of the vertical plenums.

Abstract: A method and a mounting plate system for electrical equipment in a switchgear cabinet having spaced apart frame members. The mounting plate system comprises a first mounting plate having a plurality of orifices located proximate an outer edge of the first mounting plate. A second mounting plate having a plurality of orifices located proximate an outer edge of the second mounting plate, wherein the first and second mounting plates are configured to couple to the electrical equipment in the frame members, releaseably secure the electrical equipment to the frame member from the rear of the switchgear cabinet and facilitate removal of the electrical equipment from the front of the switchgear cabinet. Another embodiment, the mounting plate system provides one of the first and second mounting plates defining a through-hole configured to accept the wire.

Abstract: The invention is to create a n arrangement for controlling and monitoring a switching installation which can be produced in a relatively cost-effective manner. To this end, the arrangement comprises a station control computer system into which the functions of at least one process control appliance and at least on protective appliance are integrated. Furthermore, the arrangement also comprises devices used to digitally control switches of the switching installation and comprising digital inputs and outputs, and an electronic conversion system arranged close to the switches and provided with digital outputs. The digital inputs and outputs of the devices for digital control and the digital outputs of the electronic conversation system are directly connected to the station control computer device by means of communication connections.

Abstract: A transformer is formed by a housing having a main transformer compartment, a first compartment for the input terminals for the main power supply, a second compartment for the output terminals to supply the load and a third compartment for a manually operable switching unit, where each of the compartments is maintained separately from each of the others and each has a manually openable interlocked cover which can be opened to provide access to an interior of the respective compartment. The switch assembly has switch contacts mounted within a switch container located within the third compartment and a manually operable member mounted one on side wall located within the third compartment outside the switch container for moving the switch contacts between open and closed positions. The switch container has a transparent window in a wall thereof through which the contacts can be observed and an insulating liquid bath maintained separate from an insulating liquid bath for the transformer assembly.

Abstract: A switching mechanism provides sequential switching of first and second circuit breakers to enable switching between a primary power supply and a backup power supply. The switching mechanism comprises a first actuator plate to operate a first circuit breaker connected to a primary power supply, a second actuator plate to operate a second circuit breaker connected to a secondary power supply, and an actuator. The first and second actuator plates are independently movable between on and off positions. The actuator is operatively connected to the first and second actuator plates so that the actuator moves the first actuator plate to an on position and the second actuator plate to an off position when the actuator is moved in a first direction, and moves the first actuator plate to an off position and the second actuator plate to an on position when the actuator is moved in a second direction.

Abstract: A hybrid gas-insulated switchgear constitutes an electrical circuit for a single-line diagram unit by arranging one first standardized module and two second standardized modules in a single row such that the central axes of tanks are generally aligned and electrically connecting them to each other. In the standardized modules, a circuit breaker and disconnecting switches are housed inside the tanks such that the disconnecting switches are positioned at first and second ends of the circuit breaker so as to line up generally in a straight line, and grounding switches are connected between the circuit breaker and the disconnecting switches.

Abstract: The movable conductors of a three phase isolation switch are incorporated into the electrically insulative molded shaft, thereby mechanically supporting them and isolating them from the metal axle of the shaft. Movable contacts on the ends of each movable conductor are angularly spaced by ? degrees, where ? is less than 180° and is 90° in the exemplary embodiment. A common fixed load contact is located angularly between, and spaced ? degrees from, both the fixed line and ground contacts so that the shaft is rotated only ? degrees between a first, closed position, in which the movable conductors connect the fixed load contact for each phase to the corresponding fixed line contact, and a second, grounded position, where the fixed load contact of each phase is connected by the movable conductor to the corresponding fixed ground contact.

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: A device is for controlling the movement of a blocking mechanism in an electric switch which is displaceably arranged in a switch cell. The device includes a push element and an oblique surface, whereby the oblique surface extends in the fitting position of the device in the direction of the travel of the switch and the push element can be maintained in a displaceable manner dependent on the position of a door of the switch cell in the switch cell. The push element co-operates with the oblique surface, acting on the blocking mechanism in such a way that the blocking mechanism is located in a release position when the door is closed and in a blocking position when the door is open. The device can be constructed in a simple manner by virtue of the fact that the oblique surface is inclined in a perpendicular position with respect to the direction of travel of the switch and the displacement path of the push element extends in a transversal manner with respect to the direction of travel.

Abstract: A door interlock assembly is for a draw-out circuit breaker assembly. A draw-out circuit breaker is housed within an enclosure including a door and includes a poleshaft operable between first and second positions corresponding to separable contacts being opened and closed, respectively. The door interlock assembly includes a pivot member coupled to the poleshaft and a door latch interconnected to the pivot member by a linkage, such as a threaded drive rod. The door latch pivots such that a first end thereof engages and locks the door of the enclosure when the poleshaft moves to the second position. An optional mechanical sensor assembly adapted to trip the circuit breaker when the door is positioned in any position other than closed, is also disclosed.

Abstract: The invention relates to a method for controlling an electrical switching module which can be displaced between an entry position and an exit position. The switching module comprises switching contacts of vacuum switching tubes; an isolating element which can be also be displaced in the switching module and comprises isolating contacts which can be connected to, and disconnected from, corresponding mating contacts inside an enclosed switchboard section, as required; and connector contacts and mating connector contacts in the low voltage range. The switching contacts of the vacuum switching tubes support the closing and opening processes, under the control influence of a closing spring which can be influenced by a closing catch (EK) and an opening spring which can be influenced by an opening catch, and prominent functional positions of the isolating position.

Abstract: The Switchgear unit, especially a motor starter, has a contactor and a power switch for short-circuit protection. The additional function of overload protection envisaged for the switchgear unit is integrated in an overload relay that is configured separately from the power switch. The components thereof extend into free areas formed by the arrangement of the contactor and power switch as standard components on a support.

Abstract: A handle assembly for a network protector where the network protector includes a circuit breaker and a housing assembly, the circuit breaker having a trip bar structured to move between a first position and a second position corresponding to an open and closed position of the circuit breaker, respectively, the housing assembly having a sidewall with an opening. The handle assembly includes a linkage assembly, a shaft assembly, a handle member and locking assembly. The shaft assembly has a shaft, where the shaft rotatably is disposed in the opening and structured to move between a first and second position. The handle member has an elongated body and an elongated grip extending generally perpendicular to the handle body. The handle body is coupled to, and structured to rotate, the shaft. The locking assembly has an elongated release grip.

Abstract: A switchgear cabinet or a switchgear cabinet assembly having at least one monitoring device arranged therein for monitoring switchgear cabinet functions, including temperature regulation. This invention provides extended control options for the safety of the switchgear cabinet, while maintaining its ease of use. To achieve this, the monitoring device is connected by a link to a monitoring module of a computational unit, which is responsible for external functions and is housed in the switchgear cabinet or assembly, and is configured for evaluating signals received from the monitoring module.

Abstract: A switch cupboard or a switch cupboard arrangement having at least one monitoring device for switch cupboard functions including temperature regulation arranged therein. The invention is constructed in a simple manner and provided with multiple monitoring possibilities, whereby the monitoring device is connected to another server-switching device, which is arranged in the switch cupboard or the switch cupboard arrangement in a data transmission link. The monitoring device is configured in such a way that it can detect operational data from the server-switching device and/or provide display information on a display control device associated with the server-switching device, and/or record configuration data inputted via the display control device.

Abstract: A utility for rapid development of three dimensional representations of electrical distribution switchgear is provided. These switchgear elevations have logical connections to the switchgear devices. An elevation can be modified to any dimensions with an infinite number of combinations and arrangements of meters and protection devices to quickly and accurately represent a customer's switchgear. Also, an event logger utility is provided for viewing, organizing and analyzing unusual behavior in a power system. The event logger utility passes a received message as an un-acknowledgeable or acknowledgeable alarm or as an event based upon the contents of a initialization file. A utility for the waveform capture is provided for viewing and analysis of waveforms (e.g., Fourier, frequency and/or harmonic analysis) captured by sophisticated metering devices. Waveforms from a device may be super-imposed for analysis. Processing of the collected waveform data to display any one of the eight waveform parameters (i.e.

Abstract: For use in switchgear equipment having channel bus bars joined together at a bus joint, there is provided a channel bus splice assembly and method. The channel bus splice assembly comprises switchgear or switchboard equipment having channel bus bars joined together at a bus joint, there is provided a channel bus splice assembly. The channel bus splice assembly comprises an inner splice plate defining a plurality of throughbores. A sliding clamp plate is configured to reciprocally move within the inner splice plate. The sliding clamp plate defines a plurality of access ports. A pair of nut plates is coupled to the sliding clamp plate and having threaded orifices corresponding to selected throughbores in the inner splice plate. An outer splice plate having a plurality of throughbores corresponding to the threaded orifices in the nut plates.

Abstract: For use in switchgear equipment having bus bars joined together at a bus joint, there is provided a bus joint cover assembly and method. The bus joint cover assembly comprises a collar member having a snap slot. A cap member having a boss snap is configured to engage the snap slot. The cap member is configured to telescopically join with the collar member around the bus joint wherein the bus joint is contained within the bus joint cover assembly. The bus joint cover assembly can include a side cover member configured to position between the collar member and the cap member. The side cover member can be configured to provide a passage for bus bars and can be configured as a bus end cover.

Abstract: The switchgear unit (2), especially a motor starter, has a contactor (4) and a power switch (6) as short-circuit protection. The additional function of overload protection envisaged for the switchgear unit (2) is integrated in an overload relay (12,16) that is configured separately firom the power switch (4). The components (16) thereof preferably extend into free areas (18,20) formed by the arrangement of the contactor (4) and power switch as standard components on a support (8). This makes it possible to achieve an economical and space-saving configuration of the switchgear unit (2).

Abstract: A switchgear wherein a connecting portion to be connected to a transmission side branch bus container and a connecting portion to be connected to a receiving side branch bus container are provided on a circuit breaker container in an up and down relation so as to face the same direction. Any one of the transmission side branch bus container and the receiving side branch bus container is connected to the connecting portion positioned on the upper side, and the other is connected to the connecting portion positioned on the lower side, and a transmission side power cable terminal container or a receiving side power cable terminal container is arranged at a position deviated horizontally from the axis of the transmission side branch bus container or the receiving side branch bus container.

Abstract: Single phase or polyphase switchgear comprising one or more switches which are mounted with the aid of solid insulation such that they are insulated, as well as associated live components such as rail systems, connectors and the like. Both the switches and the associated live components are housed in a housing enveloping said switches and live components. The enveloping housing is filled with air having a low moisture content and the interior space thereof is sealed with respect to the exterior space around the enveloping housing in such a way that the air present in the housing is not contaminated and will not reach the dew point.

Abstract: A medium high voltage switchboard plant for ships, trains, train power supply systems, and the like, that has a plurality of switch cabinets. The individual switch cabinets have low voltage fields with automatic electrical control devices and medium high voltage fields with power switches.

Abstract: A gas-insulated switchgear includes a tank filled with an electrically insulating gas, first and second conductors disposed within the tank, a disconnector for disconnecting the first conductor and the second conductor from each other, and a grounding switch for grounding the first conductor when the disconnector is in an open position. The disconnector includes a first and second fixed electrode disposed on the first and second conductors, respectively, a bridging movable electrode that is always maintained in contact with the first electrode and that is slidably movable for contacting with and separating from the second fixed electrode to connect and disconnect the first and second fixed electrodes, and an operating mechanism for opening and closing operation of the movable electrode.

Abstract: A hybrid gas-insulated switchgear constitutes an electrical circuit for a single-line diagram unit by arranging one first standardized module and two second standardized modules in a single row such that the central axes of tanks are generally aligned and electrically connecting them to each other. In the standardized modules, a circuit breaker and disconnecting switches are housed inside the tanks such that the disconnecting switches are positioned at first and second ends of the circuit breaker so as to line up generally in a straight line, and grounding switches are connected between the circuit breaker and the disconnecting switches.

Abstract: A switching device facilitates access, repair, maintenance of the device during operation in a electrical substation, and minimizes real estate and equipment in the electrical substations. The device integrates air disconnect switches, preferably mounted atop each bushing. The device further comprises wheels, a removable rail system, and a staggered height arrangement of the switches on the bushing to allow translation of the device from a first position to an electrically isolated second position.

Abstract: The instrumentation transformers 6a to 6d and 7a to 7f for measuring the voltage of the main circuit are arranged within the container 15b located in the midst of the containers 15a to 15c. In the present invention, the containers 15a and 15b are linked by the insulating tube 21a and the primary-side lead lines 49 and 53 connected electrically to the primary-side terminal of the instrumentation transformers 6a and 7a are made routed from the container 15b through the insulating tube 21a to the container 15a, and the containers 15b and 15c are linked by the insulating tube 21b and the primary-side lead lines 51 and 55 connected electrically to the primary-side terminal of the instrumentation transformers 6d and 7e are made routed from the container 15b through the insulating tube 21b to the container 15c.

Abstract: A switchgear is characterized in that a connecting portion to be connected to a transmission side branch bus container and a connecting portion to be connected to a receiving side branch bus container are provided on a circuit breaker container in an up and down relation so as to face the same direction, any one of the transmission side branch bus container and the receiving side branch bus container is connected to the connecting portion positioned on the upper side, and the other is connected to the connecting portion positioned on the lower side, and a transmission side power cable terminal container or a receiving side power cable terminal container is arranged at a position deviated horizontally from the axis of the transmission side branch bus container or the receiving side branch bus container.

Abstract: In order to shorten the length of connection buses and reduce a cost, in the present invention, a plurality of T-branched circuit breaker units 12 are arranged in a direction perpendicular to the T-branch direction, and the plurality of circuit breaker units 12 are connected by first connection bus units 14 and second connection bus units 15 in series alternately in a rectangular wave shape on a horizontal plane of approximately the same height as the T-branch portions of the circuit breaker units 12. Thereby, first connection buses 5 and second connection buses 6 are stretched around on the horizontal plane of the same height as the T-branch portions of the circuit breaker units 12, but not stretched around in an up and down direction. Therefore, the length of the connection buses can be reduced, and the cost also can be reduced.

Abstract: A switchgear cabinet monitoring arrangement having a base monitoring device which is arranged or intended to be arranged in a switchgear cabinet and has at least one bus connection, several sensor connections and at least one triggering connection, for monitoring, controlling and/or regulating switchgear cabinet functions. Various monitoring and control functions of several different switchgear cabinets, along with a relatively simple construction, are achieved because a further monitoring device arranged or to be arranged in a respective further switchgear cabinet is assigned to the base monitoring device, which is connected to the base monitoring device by a field bus. The further monitoring device also has several sensor connections and at least one triggering connection and is designed for monitoring, controlling and/or regulating switchgear cabinet functions.

Abstract: A PC switchgear cabinet with electronic components, a work shelf and a visual display unit. A versatile embodiment with a considerably enlarged work and storage area is created because of a lower element designed as switchgear cabinet, of a center element, which can be used as a work shelf and/or a storage shelf, and of the visual display unit arranged on the center element.

Abstract: A gas-insulated switchgear is miniaturized and bus-bars connected to bushings are simplified in configuration. A distance L between outer peripheries of a first vacuum interrupter 12 and a second vacuum interrupter 13 is established to be smaller than an external diameter D of the vacuum interrupters 12 to 14, and insulating barriers 28 to 30 are installed between the first vacuum interrupter 12 and the second vacuum interrupter 13, between the first vacuum interrupter 12 and a hermetically sealed container 11, between the second vacuum interrupter 13 and the hermetically sealed container 11, and between the first and second vacuum interrupters 12 and 13 and the third vacuum interrupter 14.

Abstract: The instrumentation transformers 6a to 6d and 7a to 7f for measuring the voltage of the main circuit are arranged within the container 15b located in the midst of the containers 15a to 15c. In the present invention, the containers 15a and 15b are linked by the insulating tube 21a and the primary-side lead lines 49 and 53 connected electrically to the primary-side terminal of the instrumentation transformers 6a and 7a are made routed from the container 15b through the insulating tube 21a to the container 15a, and the containers 15b and 15c are linked by the insulating tube 21b and the primary-side lead lines 51 and 55 connected electrically to the primary-side terminal of the instrumentation transformers 6d and 7e are made routed from the container 15b through the insulating tube 21b to the container 15c.

Abstract: The performance of electrochemical energy devices such as batteries, fuel cells, capacitors and sensors is enhanced by the use of electrically conducting ceramic materials in the form of fibers, powder, chips and substrates.

Abstract: A medium voltage controller for electrical equipment, such as motors, transformers, reactors, and capacitors, having an arc resistant cabinet, swaged internal electrical connections, a one-piece self-aligning withdrawable finger cluster, a pull-out instrument compartment, a load discharge device, cast fuse holders, disconnect switch, a switch illuminator, low power current transformers, and an optical temperature measuring system. The pull-out instrument compartment includes a sliding rack to which a hinged instrument mounting panel is attached. The mounting panel slides out of the compartment and swings away from the opening in the cabinet, allowing access to the cabinet internals.

Abstract: A PC switchgear cabinet with electronic components, a work shelf and a visual display unit. A versatile embodiment with a considerably enlarged work and storage area is created because of a lower element designed as switchgear cabinet, of a center element, which can be used as a work shelf and/or a storage shelf, and of the visual display unit arranged on the center element.

Abstract: Singe-pole or multipole, metal-encapsulated, compartmentalized or gas-insulated switchpanels of a switching station, which are connected by three-position switches, having isolating and grounding functions, to power switches designed with or without vacuum switching tubes, the switchpanels each being arranged in busbar housings or separate isolating housings, and being equipped with transmission devices for the visual observation of fixed contacts are provided. The transmission device includes a camera module which can be connected via a connecting device to a display device outside of the switchpanel. A lighting device is arranged in a displaced manner relative to a camera module for glare-free imaging of the busbar fixed contacts.

Abstract: A control cabinet with a frame having framing profiles and covered with side members and at least one door. The frame surrounds the inside of the control cabinet where electrical components are integrated. An air conditioning device which is placed on at least one vertical side of the frame rejects heat generated inside the control cabinet. This invention provides this type of cooling apparatus with additional equipment without the need for a large number of pieces. For this purpose, a separating member, parallel to the lateral side and placed at a distance therefrom, is attached to the framing profiles and forms with the side channel an air guiding channel. Moreover, the separating member comprises several passages for providing a physical connection between the air guiding channel and the inside of the control cabinet. Furthermore, air can be conveyed through the air guiding channel and through at least one passage by using at least one fan.

Abstract: A drawing apparatus constructed such that a screw rod 17 having an axis center along a drawing direction of an electrical machinery 1 is rotatably supported by a floor portion 11a of a drawing type electrical machinery accommodating portion 11 of a switch gear, a nut 19 engaged with a lower portion of the electrical machinery 1 is screwed with the screw rod 17, the nut 19 is moved by rotating the screw rod 17, and the electrical machinery 1 is driven in a direction of inserting or drawing out, whereby the drawing apparatus is commonly used for various drawing-type electrical machineries regardless of sizes of the electrical machineries.

Abstract: Bushing leader circuits 3, 4 are connected to end portions of two main buses 1, 2 on the side of a leading-in steel tower 110, and cable head units 85, 95 of cable leader circuits 6, 7 connected to the main buses 1, 2 are arranged in a space formed between the main buses 1 and 2. Thereby it is possible to achive both of simplification of a cable channel and the economy of the apparatus.

Abstract: The instrumentation transformers 6a to 6d and 7a to 7f for measuring the voltage of the main circuit are arranged within the container 15b located in the midst of the containers 15a to 15c. In the present invention, the containers 15a and 15b are linked by the insulating tube 21a and the primary-side lead lines 49 and 53 connected electrically to the primary-side terminal of the instrumentation transformers 6a and 7a are made routed from the container 15b through the insulating tube 21a to the container 15a, and the containers 15b and 15c are linked by the insulating tube 21b and the primary-side lead lines 51 and 55 connected electrically to the primary-side terminal of the instrumentation transformers 6d and 7e are made routed from the container 15b through the insulating tube 21b to the container 15c.

Abstract: A working enclosure includes a working chamber whose walls delimit a confinement space for working in and an exterior branch loop for recycling the atmosphere of the confinement space. The branch loop opens at each end into the confinement space and includes means for circulating the atmosphere in the branch loop. The working enclosure includes filter members at each end of the branch loop.

Abstract: The instrumentation transformers 6a to 6d and 7a to 7f for measuring the voltage of the main circuit are arranged within the container 15b located in the midst of the containers 15a to 15c. In the present invention, the containers 15a and 15b are linked by the insulating tube 21a and the primary-side lead lines 49 and 53 connected electrically to the primary-side terminal of the instrumentation transformers 6a and 7a are made routed from the container 15b through the insulating tube 21a to the container 15a, and the containers 15b and 15c are linked by the insulating tube 21b and the primary-side lead lines 51 and 55 connected electrically to the primary-side terminal of the instrumentation transformers 6d and 7e are made routed from the container 15b through the insulating tube 21b to the container 15c.

Abstract: An automatically operating interlock device prevents connection of an electrical device within a cabinet unless the cabinet door is closed. The interlock is particularly useful for circuit breakers contained within arc resistant cabinets. The interlock includes a spring-biased brake bar controlling the position of a brake. The brake bar is biased so that it pulls the brake against one of the wheels of the circuit breaker, thereby preventing movement of the circuit breaker towards its rear, connected position. Closing the door causes the door to push against the brake bar, thereby causing the brake bar to pivot the brake away from the wheel. The circuit breaker may then be moved rearward towards this connected position.