Abstract: A high current contact is disclosed having a contact pin for insertion into the high-current socket having a plurality of contact segments that are slotted in a radial direction for contacting an inner contact surface of the high-current socket; a guide sleeve surrounding the contact pin, which, by means of an at least central front pressing against the high-current socket relative to the contact pin in an axial direction from an initial position, in which the guide sleeve blocks an independent radial spreading of the contact segments in order to avoid a contact between the contacts segments protruding axially from the guide sleeve and the inner contact surface, is movable into a contact position that is set back with respect to the contact pin and in which the guide sleeve unblocks an independent radial spreading of the contact segments protruding from the guide sleeve for contacting the inner contact surface.

Abstract: A low voltage circuit breaker is provided. The low voltage circuit breaker includes a contact system with a first contact and a second contact that are electrically connectable and disconnectable relative to one another. The first contact includes a body having a first layer and a second layer, wherein the first layer is arranged on the second layer and is configured to come in contact with the second contact for providing the electrical connection with the second contact. The first layer has a first material composition having an Ag content that is higher than an Ag content of a second material composition of the second layer. Further, the first material composition has a WC content that is lower than a WC content of the second material composition.

Abstract: Spring-loaded contact pin having a sleeve (101); a spring arranged in the sleeve (101); a piston which is arranged at least partially in the sleeve (101); and a contact element which is arranged at least partially in the sleeve (101) and which is configured so as to contact the sleeve (101) and the piston (107).

Abstract: A rotor shaft module for a rotor shaft of a molded-case circuit breaker, includes a module body including an electrically insulating first material, the module body including a receptacle for a contact element of the molded-case circuit breaker. The rotor shaft module includes at least one coupling apparatus for connection to an opposing coupling apparatus of a further rotor shaft module. In addition, disclosed are a rotor shaft for a molded-case circuit breaker includes at least two coupled rotor shaft modules; a molded-case circuit breaker including a rotor shaft; and a method for producing a rotor shaft module for a rotor shaft of a molded-case circuit breaker.

Abstract: A connector unit for connecting at least two cables includes at least a male part, a female part, and a shuttle piston. The shuttle piston includes an opening configured for receiving at least a section of the male part, at least one latching device, and at least one latching structure. The male part includes the section configured for insertion into the opening of the shuttle pin, at least one latching aid, and an interaction area configured for a force-fitting interaction with at least one backing latch of the female part. The female part includes the at least one backing latch.

Abstract: An arc extinguishing apparatus for a ring main unit includes: a housing; a plurality of fixed contactor assemblies fixed to be protruded toward the center in the housing and formed by inserting a permanent magnet for arc extinguishing by a magnetic force between a pair of main circuit fixed contacts; a plurality of earthing fixed contactors fixed to be protruded toward the center in the housing and installed to be spaced apart from the fixed contactor assemblies at a predetermined angle; a 3-phases common rotational shaft installed to be rotatable at the center of the housing; and a rotatable movable contactor assembly having a plurality of puffer guide plate sections having openings with a narrow opening width to accelerate the velocity of flow of insulating gas to extinguish arc by blowing it, and rotatable to a circuit closing position, an earthing position, and a circuit opening position.

Abstract: An exemplary movable contact for an electric switch having a first contact blade and a second contact blade. Each of the first contact blade and the second contact blade includes an assembly hole. The movable contact having an assembly pin wherein the assembly pin includes a separation portion having a diameter greater than the assembly holes of the first and second contact blades thereby keeping the first and second contact blades separated from each other. The assembly pin includes a contact blade portion on each side of the separation portion for insertion to the assembly holes of the contact blades.

Abstract: A contact element for high voltage direct current switches includes a matrix made of a first material selected from the group comprising copper, silver, palladium, platinum, tungsten, molybdenum, rhenium, nickel, gold, and alloys thereof. The contact element also includes a foreign phase, which is dispersed in the matrix and is made of a second material selected from the group comprising carbon, tin(II) oxide, tin(IV) oxide, zinc(II) oxide, tungsten, nickel and mixtures thereof. The contact element has a porosity of ?1.0% by volume, based on a total volume of the contact element.

Abstract: A contact assembly for a vacuum switching apparatus includes a contact member and a reinforcing member adapted to structurally reinforce the contact member. The contact member includes first and second opposing sides, and a contact thickness. The reinforcing member has a reinforcement thickness, which is less than the contact thickness The contact member is made from a first material having a first coefficient of thermal expansion, and the reinforcing member is made from a second different material having a second coefficient of thermal expansion. The first coefficient of thermal expansion is substantially the same as the second coefficient of thermal expansion.

Abstract: A system including a contact tip that includes an arcing surface, a base surface, and a graded structure is presented. The graded structure includes a first region comprising a first surface proximate to the arcing surface, a second region comprising a second surface proximate to the base surface, and an intermediate region disposed between the first region and the second region. A concentration of silver in the graded structure decreases from the first surface to the second surface. A method of forming a contact tip includes preparing starting materials for a first region, an intermediate region, and a second region of the contact tip. The starting materials of the first, intermediate, and second regions are sequentially added to a container to form a graded blend of starting materials. The graded blend of starting materials are compacted and heat-treated to form a contact tip having a graded structure.

Abstract: An electric switch is disclosed which includes a housing module housing a movable contact and a stationary contact having a contact portion to be contacted by the movable contact . The stationary contact can include a mounting portion, which mounting portion can be positioned closer to the centre of the housing module than the contact portion of the stationary contact.

Abstract: A high voltage interrupter unit includes a switching chamber within which at least two electric contact elements of a contact system are arranged to be moved relative to one another. The contact system includes at least one mechanical element which is at least in part not in fixed mechanical connection with either of the two contact elements. In order to increase the mechanical endurance of the contact system, the at least one mechanical element is sheathed at least in part in a layer of a synthetic, abrasion resistant material.

Abstract: Compact lightweight gas insulated switchgear which assures sufficient electrode fixing strength equivalent to the fixing strength given by brazing and is structurally simple and enables efficient arc rotation with low operating energy. In the switchgear, a movable arcing contact is located on a movable element, opposite to a fixed arcing contact and electrically connected to, or disconnected from, the fixed arcing contact as the movable element moves. The movable arcing contact includes, in order from its tip opposite to the fixed arcing contact, a first electrode as a convex hollow coaxial cylindrical electrode, hollow coaxial cylindrical first spacer, and second electrode as a hollow coaxial cylindrical electrode and has electric conduction means to connect the first and second electrodes electrically through the first spacer. The first and second electrodes are fixed through the first spacer by a fixing member having higher resistivity than the first and second electrodes.

Abstract: An exemplary medium or high voltage switch has a first set of contact elements and a second set of contact elements. Each contact element includes an insulating carrier carrying conducting elements. In the closed current-carrying state of the switch, the conducting elements align to form one or more current paths between terminals of the switch along an axial direction. For opening the switch, the contact elements are mutually displaced by through two drives along a direction perpendicular to the axial direction. The switching arrangement is arranged in a fluid-tight housing in a gas of elevated pressure or in a liquid. The switch has a high voltage withstand capability and fast switching times.

Abstract: A medium or high voltage switch has a switching assembly actuated by two drives. Each drive includes a plunger arranged between two Thomson coils. The coils as well as the plunger are rectangular for reducing the weight and therefore inertia of the drive and thus to increase drive speed.

Abstract: A high voltage switch is provided, comprising a pair of electrodes housed within a high pressure gas vessel and separated by a nominal distance D. At least one of the electrodes is provided with raised surface features each having a radius of curvature that is significantly smaller than the electrode separation D. Preferably one of the electrodes is flat-faced. Preferred gas pressures within the pressure vessel are in the range 300 psi to 1200 psi. When used to switch voltages of several hundred kilovolts, an operational life for the electrodes of between 400 and 1000 hours has been achieved.

Abstract: A movable contact for a rotary switch is provided. The movable contact includes first and second contacts for contacting a stationary contact, where the first and second contacts are arranged at a distance from each other for receiving the stationary contact between the first and second contacts. The first contact is a straight contact blade for contacting stationary contacts at both ends of the blade. The second contact is a spring element configured to bend when the stationary contact is placed between the first contact and the second contact, and to cause a pressing force to the stationary contact to press the stationary contact against the first contact after the stationary contact has been placed between the first contact and the second contact.

Abstract: In a contact arrangement for high-power electrical switching devices having at least two circular contact piece pairs in a convex/flat or convex/convex contact piece pair of contact pieces directly connected in parallel, mechanically and electrically in a circuit. A central recess, the largest diameter of which is approximately ? of the contact diameter of a contact piece, is provided in the contact surface of at least one contact piece partner of a contact piece pair. In a convex/concave or flat/concave contact piece pair of contact pieces, however, a positive projection is arranged within the centre of the concave contact surface of a contact piece partner, the largest diameter of which is approximately ? of the contact diameter of the contact piece.

Abstract: A high-voltage disconnector includes first and second contact elements movable along a disconnecting axis with first and second latching elements fixed thereto, respectively, a drive system for moving the first contact element in an opening direction along the axis to open the disconnector, and a restoring system for restoring the second contact element counter to the opening direction. With the disconnector closed, the first and second latching elements are arranged in a latched connection with one another. During an initial phase of the movement of the first contact element in the opening direction the latched connection initially remains, and the second contact element is carried along by the first contact element in the opening direction. During a disconnecting phase, the latched connection is released, the second element is restored by the restoring system counter to the opening direction, and the second contact element is disconnected from the first contact element.

Abstract: The disclosure relates to a method for producing a contact piece, for use in a vacuum interrupter chamber, especially in a low, medium or high voltage vacuum interrupter chamber. The aim of the disclosure is to improve multi-layer contact systems in such a manner that even larger layer thicknesses can be used to improve the electrical properties. For this purpose, the contact piece is comprised of at least two layers of powder-metallurgical pressed green compacts with a solder film inserted thereinbetween, the layers being soldered together in a soldering furnace in a desired relative position to each other at the same time the layers are sintered.

Abstract: The present invention relates to a vacuum switch tube, which includes a first contact and a second contact disposed on conductive rods respectively. The two contacts are disposed facing each other. The two contacts are cylinders and include conductive members and magnetic members to form contact bodies. The cross section shape of the magnetic members is divided by a neutrality line into two unequal regions. The magnetic member of the first contact and the conductive member of the second contact are disposed corresponding to each other. The conductive member of the first contact and the magnetic member of the second contact are disposed corresponding to each other. The two vacuum switch contacts are anti-symmetrically disposed, such that a rotating magnetic field having rotating lines of magnetic force is formed, so that re-ignition possibility during voltage breaking is effectively reduced, and an arc voltage is decreased.

Abstract: A gas circuit breaker is provided, avoiding change in the position of a cover member and without weakening of the blow of gas to the arc in an arc discharge cavity even when a surface of the cover member in contact with the arc discharge cavity is damaged. The gas circuit breaker includes a contact ring, a holder attached to the contact ring, and extending to a path of arc-extinguishing gas that extinguishes an arc, and an electrically insulative cover member attached to the holder.

Abstract: A contact is for a vacuum interrupter. The contact includes a contact member having a generally planar mating surface with a planar contact plane and a plurality of purposely introduced undulations therein. The undulations are structured to contact a plurality of purposely introduced undulations of another contact member. The undulations are in a dimension perpendicular to the planar contact plane. The planar contact plane has a diameter. The undulations have a depth substantially smaller than the diameter of the planar contact plane.

Abstract: The present invention relates to a vacuum switch tube, which includes a first conductive rod and a second conductive rod. A first contact is disposed at the first conductive rod. A second contact is disposed at the second conductive rod. The first contact and the second contact include conductive members and magnetic members, and are sealed in a vacuum tube body and correspondingly disposed. A front end of the first contact is disposed with a convex hemisphere. A front end of the second contact is disposed with a concave hemisphere matching with the front end of the first contact in shape. Therefore, the vacuum switch tube increases surface areas of the contacts, and reduces a resistance increase caused by the poor contacting effect. Meanwhile, a rotating magnetic field is formed between the convex hemisphere and concave hemisphere contacts, thereby facilitating arc-extinguishing and enhancing a breaking capability.

Abstract: An electric contact element for an arcing contact including a contact body arranged to be applied against a contact element. The contact body includes a Mn+1AXn-material, wherein M is at least one transition metal, A is at least one element selected from group 13-17 in the periodic table, X is C and/or N, and n is 1,2,3 or higher. A method of making a contact element including a contact body including a Mn+1AXn-material. Use of an electric contact element including a contact body including a Mn+1AXn-material in an arcing contact.

Abstract: A vacuum switch tube is provided, which includes a first conductive rod and a second conductive rod disposed with a first contact and a second contact respectively. The two contacts are sealed in a vacuum tube body and disposed facing each other. A front end of the first contact is a convex hemisphere. A contact body of the second contact is an annular body matching with the front end of the first contact. The first contact includes a first conductive member and a first magnetic member. The first conductive member and the first magnetic member extend in the same direction and match with each other. The first conductive member and the first magnetic member of the first contact are yin-yang-fish matched in shape, the cross section shape of the first magnetic members is divided by a neutrality line into two unequal regions. The second contact includes a second conductive member and a second magnetic member for forming the contact body of the second contact.

Abstract: The invention relates to a vacuum switch, especially a vacuum circuit breaker, for medium and high voltages, comprising a mobile switch unit arranged inside a vacuum switch compartment (1) and provided with mutually mobile elements including a contact tappet (17), an insulator (18), and a driving or switching rod (11) introduced into the vacuum switch compartment (1) by means of metal bellows. Said vacuum switch also comprises a fixed contact inserted into the housing of the vacuum switch compartment (1). The upper end of the insulator (18) is fixed to the contact tappet (17), and the lower end of the insulator (18) is fixed to the driving or switching rod (11). The contact tappet (17) is connected to a conductor (8) by a flexible, electroconductive connection (20), said conductor being electroconductively connected to at least one laterally arranged output contact (6). The aim of the invention is to enable an improved embodiment of the switching and contact surfaces.

Abstract: The invention relates to a method for producing contact makers for vacuum switching chambers, which are used in low-voltage, medium-high voltage, and high-voltage engineering, during which the contact makers are provided with slots extending from the middle area of the contact to the edge. The invention also relates to the contact maker itself. In order to improve a method for producing contact makers in vacuum switching chambers as well as a contact maker of the type in question so that the production method is distinctly less complicated, and the contact maker is sufficient for the highest functional demands, the invention provides that the contact makers are produced in a powder metallurgical process in which they are provided with near final contours and near final dimensions. During this process, said slots are already made in the green compact and are fixed during a subsequent sintering.

Abstract: A gas insulated switchgear includes stationary contacts, movable contacts contactable with or uncontactable from the stationary contacts, an insulation case housing the stationary contacts and the movable contacts so as to support the same, the insulation case having a shape of a pipe, flanges disposed at an inner circumferential surface of the insulation case in a circumferential direction, each of the flanges having an annular shape, and a collection groove portion formed at the flanges and collecting metal particles generated during contact or separation operation between the stationary contactors and the movable contactors. Under this configuration, the metal particles can be collected and laid in the collection groove portion provided at the flanges, accordingly, the metal particles cannot be stuck on an insulation member or other components of the insulation case, resulting in obviating occurrence of insulation breakdown within the switchgear and improving reliability of a product.

Abstract: A circuit breaker is provided which can be filled with a quenching gas and which has two contact arrangements, which can be moved relative to one another and along a longitudinal axis of the circuit breaker. The contact arrangements form a arcing contact system and a rated current contact system connected electrically in parallel with it. One of the contact arrangements includes inner rated current contacts and outer rated current contacts of the rated current contact system, where the inner rated current contacts overhang the outer rated current contacts in the direction of the longitudinal axis, and the outer rated current contacts coaxially surround the inner rated current contacts. The circuit breaker has a high current carrying capability as well as a reliable switching-on and -off behavior, such as during and after the occurrence of a short-circuit current in the circuit breaker.

Abstract: A switching device, in particular a power switching device, has two pairs of series-connected switching contacts for interrupting a conducting path and at least one quenching packet, disposed near the pairs of switching contacts, for quenching the arcs occurring when the conducting path opens. The pairs of switching contacts are arranged such that their opening paths are substantially mutually parallel or antiparallel. The pairs of switching contacts are connected in series such that the same current flowing in both arcs flows spatially in the same direction. The quenching packet is disposed in the area between the opening paths.

Abstract: A switch for a switching unit for energy supply and distribution includes a first connection and a second connection, each with a cylindrical bolt. The bolts are axially adjacent one another and spaced apart. An annular sleeve with an inner diameter larger than the diameter of the bolts, is arranged in such a way that it can be axially displaced on the bolt of the first connection, and partially on the bolt of the second connection. At least a first contact element is arranged between the surface of the bolt of the first connection and the inner surface of the annular sleeve. At least a second contact element is arranged and constructed in such a way that it can be positioned between the surface of the bolt of the second connection and the inner surface of the annular sleeve.

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 short-circuit device is provided for medium and high-voltage switching devices, in which at least one moving contact is moved onto a fixed contact by means of a propelling charge. Two contact arrangements are provided in series to provide a higher dielectric strength. Each of the contact arrangements includes a fixed contact and a moving contact. A first fixed contact of a first one of the contact arrangements contains a mechanical ignition device for providing a propelling charge to a moving contact of the second one of the contact arrangements, such that when the moving contact reaches the fixed contact of the first contact arrangement, the propelling charge is mechanically ignited to cause the moving contact of the second contact arrangement to be propelled toward the fixed contact of the second contact arrangement.

Abstract: An electrical switching device, especially a high-voltage circuit breaker, contains arcing contacts and nominal current contacts. At least one of the nominal current contacts has a surface formed of an arc-resistant material provided with a galvanic coating. In this configuration, the contact points can withstand high mechanical and thermal loads and at the same time maintain a high current carrying capacity.

Abstract: An electric contact element for an arcing contact including a contact body arranged to be applied against a contact element. The contact body includes a Mn+1AXn-material, wherein M is at least one transition metal, A is at least one element selected from group 13-17 in the periodic table, X is C and/or N, and n is 1,2,3 or higher. A method of making a contact element including a contact body including a Mn+1AXn-material. Use of an electric contact element including a contact body including a Mn+1AXn-material in an arcing contact.

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 accessory tray is provided for an electrical switching apparatus, such as a circuit breaker, including a housing, an operating mechanism, and a number of accessories. The housing has a cavity with a first end and the second end, and is disposed beneath the operating mechanism. The accessory tray includes an elongated member including first and second ends and is structured to receive the circuit breaker accessories. A guide mechanism guides the elongated member into and out of the cavity, in order to install the circuit breaker accessories beneath the operating mechanism. When the elongated member is disposed within the cavity, the first end is disposed at or about the cavity first end and the second end is disposed at or about the cavity second end. The accessory tray may be a single-piece molded member having a plurality of mounting portions for removably securing a plurality of circuit breaker accessories.

Abstract: An electrical conductor mount is provided for an accessory including a number of electrical conductors and an actuator. The electrical conductor mount includes an accessory enclosure from which or to which the electrical conductors extend. A mounting element is disposed on the enclosure proximate the electrical conductors external to the accessory enclosure. The mounting element includes a receiving portion structured to receive the electrical conductors, and a retaining portion retains the electrical conductors within the receiving portion. The mounting element mounts the electrical conductors in a position in which they do not obstruct operation of the actuator. The mounting element may be a resilient hook including a first end disposed on the enclosure of an accessory module. The retaining portion may be a hook disposed on the second end of the resilient hook.

Abstract: A strain relief mechanism is provided for an accessory for an electrical switching apparatus, such as a circuit breaker. The accessory includes an enclosure having a first end with an aperture, a second end disposed opposite and distal from the first end, and a number of electrical conductors, such as wires, extending through the aperture and outwardly from the first end of the accessory enclosure. The strain relief mechanism includes a support extending outwardly from the first end of the enclosure, and being proximate the aperture and the number of electrical conductors extending therethrough. A fastening mechanism, such as a wire tie, wraps around the electrical conductors and the support in order to secure the number of electrical conductors to the support and resist undesired movement thereof. First and second portions of the enclosure are fastened together without a plurality of separate fasteners.

Abstract: A contact assembly for a circuit breaker includes a fixed contact, a movable contact, and a movable contact arm. The movable contact arm includes a first end carrying the movable contact, a second end, and a pivot portion proximate the second end. A moving arm portion extends from the first end toward the pivot portion. The moving arm portion has a width, an upper edge, a lower edge, and a height defined by the distance between the upper edge and the lower edge. In response to a trip condition, the movable contact separates from the fixed contact and the movable contact arm pivots open at an angular opening velocity. The height of the moving arm portion of the movable contact arm is at least four times the width of the moving arm portion, thus minimizing the moment-of-inertia of the movable contact arm, and increasing the angular opening velocity.

Abstract: A current limiting power switch has a monolithic stationary conductor with a conductor section that mounts fixed contacts that engage moving contacts on moving contact fingers to form a reverse current loop with the contacts closed. A terminal section projects transversely from one end of the conductor section and an arc runner section extends from the other end. The tapered arc runner has a generally laterally centered tapered area that gathers the arcs and urges them along a raised rib on the arc runner to an arc chute. A reinforcing rib running from the back of the conductor and arc runner sections to the terminal section resists distortion of the monolithic stationary conductor by the high temperatures and closing and electromagnetic forces during interruption.

Abstract: A high voltage switch contact structure capable of interrupting high voltage, high current AC and DC circuits. The contact structure confines the arc created when contacts open to the thin area between two insulating surfaces in intimate contact. This forces the arc into the shape of a thin sheet which loses heat energy far more rapidly than an arc column having a circular cross-section. These high heat losses require a dramatic increase in the voltage required to maintain the arc, thus extinguishing it when the required voltage exceeds the available voltage. The arc extinguishing process with this invention is not dependent on the occurrence of a current zero crossing and, consequently, is capable of rapidly interrupting both AC and DC circuits. The contact structure achieves its high performance without the use of sulfur hexafluoride.

Abstract: An element (20) for making an electric contact to another contact member (19) for enabling an electric current to flow between said element (20) and said contact member comprises a body having at least a contact surface thereof coated with a contact layer (21) to be applied against said contact member. This contact layer comprises a continuous film comprising a laminated multielement material having strong bonds, such as covalent or metallic bonds, within each atomic layer and weaker bonds, through larger bonding distance or for example as van der Waals bonds or hydrogen bonds, between at least some adjacent atomic layers thereof.

Abstract: A connector rail includes a full profile which is provided with first bearing surfaces and second bearing surfaces which are used to provide support in the window opening of the rear wall of the housing. The second bearing surfaces are provided with projections for securing continuous current conductors which are aligned in a parallel manner and which are, for instance in the case of low voltage circuit breakers, embodied as male contacts for fixed contacts. Respectively corresponding projections are provided in order to secure the flexible cables to the moveable switching contacts or to secure the fixed switching contacts.

Abstract: Connecting bars are made from profiled semifinished products and have a cavity. The bars have the same outer dimensions for different nominal currents and are intended for connecting the electrical components of electrical devices and apparatus to an external electrical circuit. The connecting bars extend through the window opening located in the wall of the devices or apparatus and are fixed in the housing by a fixing device including two or more partial parts profiles. These are configured in such a way that they can be connected to one another by positive fit or otherwise to a hollow connecting bar. The partial parts have one or several legs, the length of which defines the height of the connecting bar.

Abstract: An electric pole for a low-voltage power circuit breaker, comprising: a fixed contact and a movable contact which can be mutually coupled/uncoupled; at least two conducting elements, suitable to electrically connect the movable contact to a power supply grid, the conducting elements being arranged so that the electric currents flowing through them are equally orientated; means for mechanically supporting and actuating the movable contact; and at least one insulating element which is interposed between the conducting elements and is suitable to contrast, by friction with the conducting elements, electrodynamic repulsion forces that are generated between the fixed contact and the movable contact during opening in short-circuit operating conditions.

Abstract: A blade assembly for use in a circuit breaker, the blade assembly comprising a plurality of blades, including one or more pairs of adjacent side-by-side blades having coplanar contact surfaces and coplanar bearing surfaces, at least one set of blade springs, each having one end in operative contact with the bearing surface of each of a pair of adjacent side-by-side blades, the at least one set of blade springs comprising at least one compression spring.

Abstract: A contact system having a two-armed contact arm equipped at its opposite ends with contact pieces that can be brought into and out of contact with corresponding contact pieces of stationary busbars. The contact arm is mounted rotatably on a central bearing axis using an elongated hole, the two lever arms being acted upon by contact force springs that brace with one end against a switching shaft or a switching shaft segment. To provide a uniform contact pressure in the presence of differing wear of the contact pieces, the elongated hole extends in a direction that differs substantially from the direction perpendicular to the longitudinal axis of the contact arm and substantially from the longitudinal axis, and the longitudinal action direction of the contact force springs extends neither perpendicular to the longitudinal axis nor perpendicular to the extension direction of the elongated hole.

Abstract: An electromagnetic blow-open device for a pole of a circuit breaker where the pole has a stationary contact and a movable contact. The movable contact includes contact fingers mounted on a contact carrier. The contacts have an open position and a closed position. The pole further has an associated rotatable pole shaft. The electromagnetic blow-open device includes a collapsible linkage having a rigid position and a changeable position. The collapsible linkage is disposed between, and coupled to, the pole shaft and contact carrier. The collapsible linkage is maintains the stationary contact and the movable contact in the closed position while the collapsible linkage is in the rigid position and to allow the stationary contact and the movable contact to move to the open position when the collapsible linkage is in said changeable position. The electromagnetic blow-open device also includes an actuator arm which is coupled to the collapsible linkage and is responsive to an over-current condition in the pole.