Abstract: In a vacuum circuit breaker for switching electric currents in the high-power range, a current conductor support is attached to the current conductor clamp for absorbing the high electro-dynamic attraction forces between the two current conductors subject to short-circuit current that run next to one another at a distance and to maintain the predetermined curvature of the current conductors so that the shut-off process or the shifting of the moving contact to the final position is not hindered.

Abstract: A circuit breaker has at least one housing having at least one opening, and at least one pair of contacts located in the housing, the contacts of the pair of contacts being mobile in relation to each other for opening and closing an electric circuit. An open-pore metal foam (20) is interposed between at least one of the pairs of contacts and at least one housing opening (11), the metal foam being electrically insulated from the current-carrying elements of the circuit breaker (1). An open-pore metal foam (20), produced of a zinc base alloy or aluminum base alloy, can be used as a cooling structure for the dissipation of heat from switching gases that are produced by an electric switching process.

Abstract: An electrical switch is disclosed. The switch includes at least one switching contact which is held against the prestressing force of a contact force spring on a moving contact mount, and an arc quenching device, in which at least one section of the at least one contact force spring extends between side pieces of the contact mount. A device for limiting the spreading of combustion products is provided, which has an angle bracket inclined with respect to the opening direction of the moving contact mount. When the contact mount is in the open position, the bracket overhangs the at least one section of the at least one contact force spring. In order to protect the contact force springs, in particular at the end of the opening process, even better against contamination by spreading combustion products, the inclined angle bracket is seated in a prestressed manner on the side pieces.

Abstract: A low-voltage circuit breaker includes a first contact arrangement, for connecting a fixed contact to a first busbar and a second contact arrangement, for connecting a counter contact, arranged on a contact lever, to a second busbar. A low-voltage circuit breaker is produced, which may be converted with minimal material complexity and little effort from a fixed switch into a modular switch, whereby the busbars of a low-voltage circuit breaker include moulded features such that the low-voltage circuit breaker may be embodied as both a fixed breaker and a modular breaker.

Abstract: A power circuit breaker includes an insertion rack which is arranged in a distribution unit and a lock system for locking the power circuit breaker in the insertion rack in a locking system. The locking system can be actuated by a drive mechanism, in particular by the switch shaft of the power circuit breaker.

Abstract: The invention relates to a low voltage circuit breaker which comprises a contact system for a principal current and an arc extinction chamber. An are transmitting element is disposed between the contact system for the principal current and the arc extinction chamber. Said are transmitting element comprises at least one are guiding element which makes it possible to direct said arc in a certain manner to the arc extinction chamber.

Abstract: The invention relates to a switch contact arrangement with a first moving switch contact, with a second switch contact, provided for the first switch contact and with an erosion display, for the switch contacts. The erosion display comprises an erosion pointer and a display surface or display edge. The display pointer follows the movement of the first switch contact and, on closing the contacts, then only extends over the display surface or display edge when the value for the erosion of the switch contacts is less than a given maximum value. In order to be able to shorten the display pointer in the unused condition without a special tool to give a separation from the display surface or display edge, the value of which corresponds to the value of the maximum permitted erosion of the switch contacts, at least one marking for the cutting of the display pointer is provided, whereby the marking is separated from the display surface or display edge by the maximum permitted erosion of the switch contacts.

Abstract: A switching arrangement for low-voltage circuit breakers with a high nominal current includes movable switching contacts arranged essentially on a moveable contact carrier. It further includes fixed switching contacts and a device for cooling, de-ionizing and extinguishing an electric switching arc. The fixed contact is provided with a pre-contact function over the entire contact width thereof. Moveable contact levers are arranged according to a set pattern in a distributed manner over the entire width of the contact carriers and are provided with or without a pre-contact. A contact lever with a pre-contact and a contact lever without a pre-contact can be provided successively. Similarly, two or more contact levers with a pre-contact and two or more contact levers without a pre-contact can be successively and alternatingly provided in packet-form.

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 connector for conductor bars, which are in-line or extend at a right angle with regard to one another and which rotate 90° around their longitudinal axes. The connector is comprised of a first contact piece and of a second contact piece of which the first contact piece is fastened in an eccentric manner, with regard to the longitudinal axis thereof, to the second contact piece at a position on the second contact piece that is also positioned in an eccentric manner with regard to the longitudinal axis. The first contact piece is connected to the second contact piece in such a manner that their longitudinal axes extend at a right angle with regard to one another but at a distance from one another so that the contact surfaces of the contact pieces do not intersect or overlap one another, but are adjacently arranged such that the pivot by 90° towards one another.

Abstract: An electric arc extinction chamber system, especially for low-voltage circuit breakers of very high nominal current intensities, wherein parallel electric arc extinction chamber inserts are provided in a housing extending over the entire width of a pole-face arc. The housing of the chamber is sub-divided by a partition wall or several partition walls which are embodied as components of the housing. The compartments thus formed receive arc splitter cartridges.

Abstract: A switching chamber enclosure includes a number of enclosure parts with specific functional subdivision, in which switching elements are arranged. The enclosure of the switching device is formed at least by one lower shell and one upper shell, which are separated from one another by a horizontal separating joint. In addition, one or more intermediate shells may provided, which are likewise separated from the lower shell, from the upper shell and from one another by horizontal separating joints.

Abstract: Connecting bars for electrical appliances and devices, for different nominal currents, are configured in such a way that they are hollow. They may have only one or more than one cavity. The connecting bars have the same outer cross section for all current intensities, have different wall thicknesses, and consequently have differently sized cavities, for different current intensities. Consequently, the lead-through openings for the connecting bars in the respective switch housings of a type series can all be configured identically, corresponding to the dimensions for the connecting bars of the maximum current intensity.

Abstract: An arc extinguisher for low voltage switchgear, switching in air, includes a universally applicable variable attachment for adjustment of the arc extinguisher chamber to meet increased demands. The attachment is in the form of a chimney-like arc extinguisher chamber extension, for increasing the volume of the arc extinguisher chamber. It represents a moulded piece with a lower outline which exactly matches the outline of the arc extinguisher chamber cover, normally located on the arc extinguisher chamber and with an upper outline, identical to the upper outline of the switchgear housing for mounting the arc extinguisher chamber cover. Any number of attachments may be used in a stacked manner.

Abstract: A drive train is for a displaceable contact on a breaker contact arrangement in an electrical power breaker. A coupling element displaceable against a stop and arranged between the moveable contact and corresponding drive element is provided with an anti-bounce device, including a catch element and a counter piece. The catch element which may be swung into a catch position as a result of the inertia exerted on the centre of gravity thereof, when the coupling element strikes the stop, includes a working surface extending in the pivoting direction to forma momentary working connection with the counter piece. A retaining spring is additionally provided on the catch element to guarantee that a rebounding of the coupling element into the position corresponding to the close state of the breaker contact arrangement does not occur.

Abstract: A low-voltage circuit breaker includes an enclosure. The enclosure includes a front wall and a rear wall, and further includes specific functional subdivisions. The front wall and the rear wall are separated from one another by a separating joint, which runs vertically in the in-use position, between the enclosure front wall and the enclosure rear wall. An integrated cable duct is provided in the base of the enclose rear wall. The cable duct can be covered and extends underneath the contact support bearings and underneath the current transformer chambers which surround the lower connecting rails essentially over the entire width of the low-voltage circuit breaker. In the direction of the enclosure front wall, it has one or more through-opening for the connecting cables to pass through between the current transformers and the electronic tipping unit.

Abstract: A low-voltage power circuit breaker includes a current-limiting opening of a mobile switching contact. The force-transmitting connection between the actuating shaft lever and the mobile switching contact or the contact support is provided in the form of a latching device and includes two identical levers, which can pivot in relation to one another around an articulated joint and which are joined to one another by way of the articulated joint that is formed by a joint pin guided through aligned continuous borings provided in concentric parts of the levers. The contact surfaces of the levers have slanted surfaces that serve as a tooth. In the vicinity of the articulated joint, the levers are subjected to the action of an adjustable spring force, which is exerted by a pressure spring and which acts upon the tooth.

Abstract: A switchgear, for low-voltage switching units with a linearly-displaceable contact support, includes a case-like housing with guide grooves, running in the direction of travel of the contact support, in the housing side walls thereof. Suitable projections on the side of the contact support, engage in the grooves, whereby the linear travel of the contact support is achieved. Pivoting contacts are arranged on the contact support as displaceable switch contacts.

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: An arc quenching device for an air-switching low-voltage switching device includes quenching plates, which are arranged between and attached to parallel insulating walls, as well as a cover. A separate cooling device may be introduced into the space between the quenching plates and the cover. The cooling device is in the form of an insert cartridge and contains deionization technology for switching gases. Attachment pins on the cooling device and corresponding holding openings on the inside of the cover make it possible to fit the cooling device to the cover before this cover engages with the insulating walls.