Abstract: A contact arrangement provided for an electrical switching device, particularly for a contactor or protective relay, includes a stationary contact element and a movable contact element. The stationary contact element essentially consists of an elongated current lead-in member, at the end region of which there is affixed a contact member. At this contact member there is adjacently arranged an arc guiding element which is supported at the elongated current lead-in member, but is electrically conductively connected to the current lead-in member solely at an end portion thereof. At the surface or side facing away from the elongated current lead-in member, the arc guiding element is provided on an end surface area confronting the contact member with a projection which is formed of ferromagnetic material and symmetrically arranged in the center of the arc guiding element.

Abstract: A mode switching or conversion device for selectively altering the operating mode of an electrical switch or other piece of equipment comprises an actuator or locking member rotatable about an axis of rotation which is disposed substantially perpendicular to the housing wall of the electrical switch. The actuator is positionally retained in an opening of this housing wall by means of a bayonet catch or joint. This actuator or locking member is provided with an axially elastic spring or resilient bracket provided with latching cams or lugs which can latch in different positions thereof into latching recesses or pockets of a latching base member of the housing.

Abstract: An electrical protection switch, or circuit breaker, includes a movable contact part rotatably seated on a bolt which is secured to a leg of a mount. The other leg of the mount lies against a flange of a coil member which forms a portion of a magnetic release means. Two retaining elements extending parallel to one another and mutually spaced apart project from this flange. The retaining elements accept one leg of the mount therebetween and are provided with resilient tongues which press against the leg of the mount lying against the flange and, thus, press the leg against the flange. Fastening of the mount having the movable contact part to the magnetic release means, or coil member, is performed simply by slipping the mount onto the coil member by a snap-in connection.

Abstract: There are arranged at a magnetic trigger for a selectively operative switch, a plunger-type armature, a pivotable armature and a tripping device. A plunger of the plunger-type armature acts directly upon a movable contact of a pair of contacts and the plunger-type armature is actuated using a magnetic coil or winding when the current flowing through the magnetic coil at least corresponds to a predetermined threshold current for opening the contacts. A pivotable armature is actuated by the plunger-type armature and redirects the magnetic return flux. The tripping device acts upon a switch lock mechanism and is switched into or out of the magnetic return flux by the plunger-type armature. The degree of overlap between pole shoes of the pivotable armature and of the tripping device is preselectable by an adjusting screw. There is thus realized a current-dependent, selective tripping of the switch lock mechanism.

Abstract: The current converter or transformer component of a high voltage measurement transformer comprises a primary lead or conductor which is surrounded by secondary windings or optical conducting elements. The primary and secondary components of the current converter or transformer component are housed in a casing having an integrally formed entry duct for the secondary leads. The secondary components of the current converter or transformer component are surrounded by plastic or synthetic insulation material. This insulation material or insulation also surrounds a channel for the secondary leads extending completely through the entry duct. The primary lead or conductor is provided with connecting flanges at both ends for mechanically or electrically connecting the high voltage measurement transformer to a high voltage or high power circuit breaker or similar device.

Abstract: A protection switch, or a circuit breaker, includes a bimetallic element provided with a heating winding to form a portion of a structural unit insertable into an upper housing part, said structural unit further including a carrier connected to the bimetallic unit and having a connecting terminal extending from the carrier. The structural unit also including a terminal element connected to the heating winding and having an arc runner continuation, as well as carrying a contact piece of the switch contact. Continuations are provided for positioning the structural unit in a housing, the continuations engaging into guide grooves rigidly provided in the housing. The terminal element, in the region of the contact piece, is pressed against the housing stop and the carrier includes a fork-like free end embracing a catch rib of the housing. The bimetallic element is correctly positioned upon insertion of the structural unit into the housing so that readjustment is not necessary.

Abstract: The motor protection switch comprises a movable contact piece being manually movable by way of an actuator, which includes actuator buttons. The contact piece can be brought in and out of contact with a resting contact piece. The motor protection switch can also be released by overload current or short circuit current. A retracting or pullback mechanism with two settings settable from outside are provided for the actuator. In the first setting the pullback mechanism will hold the actuator in a trip position between the "on" and the "off" position after overload tripping or short circuit tripping has occurred. In the second setting the pullback mechanism will allow direct movement of the actuator from said "on" position into said "off" position after overload tripping or short circuit tripping has occurred.

Abstract: An axially reciprocatable actuation rod is conducted out of a vacuum chamber and connected with one of the terminals of a vacuum switch by a connecting conductor. In order to exploit the short switching stroke which is characteristic of vacuum switches and thereby reduce the construction expenditure for the connecting conductor, the connecting conductor is constructed as a yoke whose ends are forked. These opposed ends of the connecting conductor engage at one end thereof the actuation rod and at the other end thereof a protrusion on the terminal extending in the direction of the actuation rod. The opposed ends frictionally engage the actuation rod and the protrusion elastically at mutually opposing locations thereof.

Abstract: A reciprocatingly movable actuating rod is coupled to a longitudinally translatable contact plunger through a linkage and a stationarily arranged S-shaped guideway. A compression spring which is compressible during the course of a switching engagement stroke also acts upon the contact plunger. In order to keep especially the contact plunger as free as possible from transverse forces during the switching stroke and to keep the actuating rod unloaded both in the engaged position and in the disengaged switching stroke position, one end of the actuating rod, which extends perpendicular to the direction of motion of the contact plunger, carries a journal pin engaging the guideway. One end of a connecting rod included in the linkage is pivotably connected to the journal pin. The other end of the connecting rod is pivotably connected to the contact plunger through an entrainment sleeve.

Abstract: For each phase to be switched, there is provided at least one pair of fixed contacts consisting of an upper fixed contact and a lower fixed contact as well as one rotary or movable contact. The rotary contact is rotatable about an axis of rotation and is in constant engagement with one of the fixed contacts. The rotary or movable contact is supported on a support made of insulating material. The support is also rotatable. To reduce the torsion moment or torque required for turning the rotary contact to a minimum, the rotatable support possesses, in the vicinity of the rotary or movable contacts, a cranked or bent section in the form of a crank shaft in which an open-ended recess or aperture is provided for each contact. There recesses or apertures carry the rotary or movable contact.

Abstract: Two similar switch apparatuses are mounted in switching direction at equidirectional closing direction onto a base. Each apparatus has an extension which is movable together with the armature of the corresponding apparatus and which extends in a respective L-coulisse of a two-armed lever placed on a stub shaft of a casing of one of the switch apparatuses to pivot thereabout. If one of the switch apparatuses carries out its switch closing operation, its extension moves in a path section of the coulisse at an acute angle relative to the direction of radius, causing a counterclockwise pivoting movement of the lever. Conclusively, the extension of the other switch apparatus will be caused to be located into a path section of its coulisse extending circularly around the stub such that the latter extension is blocked, preventing a switching movement.

Abstract: A movable and a stationary contact element are tubularly structured for the purpose of axially discharging arc gases. A blast nozzle is associated in a fixed reference position with respect to one of the contact elements. A narrowest location or throat of the blast nozzle is positioned forwardly of the end of this one contact element and is closed by the other contact element in the cut-on position of the gas-blast switch. An inlet of the blast nozzle communicates with a pump space bounded by a cylinder and a piston. The contact element with which the blast nozzle is associated displaceably extends through the piston. The pump space can be pressurized during a cut-off stroke. Both of the contact elements are provided with related outlets in their related regions which are remote from the free ends of the contact elements. At least in the cut-off position the outlets interconnect an interior space formed in the related contact element and a blow-out space.

Abstract: The electromagnetic switch apparatus is housed in a two-partite casing. A partition wall inserted into the casing separates the switching magnet chamber from the switch- and connection contact chamber. The partition wall comprises a plurality of extensions which are stepped at least twice and extend into the switch- and connection contact chamber. The portions of the extensions located below the connection contact members cover in an electrically insulating manner the lower areas of the switch- and connection contact members. The upper narrow portions of the extensions extend up to in front of the connection contact members and form a protection against an accidental contact.

Abstract: The auxiliary contact assembly comprises a two part casing having an upper section for receipt of the fixed contacts provided with the connecting screws and a lower section having the shape of a trough open on top and mounted to the upper section by means of locking detents. The fixed contacts are clamped into recesses located in the upper section and open at their sides. A at the bottom open channel is formed at the upper section and acts as guide for the contact bridge carrier. The side walls of the trough-shaped lower section enclose the fixed contacts in the recesses and are provided with narrow projections extending upwards into the area of the connecting screws and form thereby a protection against accidental contact. The contact bridge carrier which is provided with a plurality of contact bridges is guided at the bottom by the lower section of the casing. The lower section is provided with mounting elements and a through hole for the coupling member of the contact bridge carrier.

Abstract: A rocking beam is movable into an "on" and an "off" position by actuating means which actuate linkage means and work against the force of a spring urging the beam into an intermediate trip-position. Through a guide surface the beam actuates a toggle assembly composed of two toggle levers linked by a toggle joint and having distal joints linked with a contact actuating lever and a pawl lever, respectively. When the pawl lever is restrained by the ratchet, the movement of the toggle joint caused by moving the actuating means into the "on" or "off" position results only in the opening and closing of contacts through a movement of their actuating lever. A readiness for switching on can be obtained by resetting the actuating means from the trip-position into the "off" position.

Abstract: The coupling system is assembled upon the placing of the auxiliary contact block including its dogs integrally formed at its bearing surface and its coupling member including a coulisse onto the switch apparatus followed by a shifting of the auxiliary contact block. When placing the auxiliary contact block onto the switch apparatus the dogs engage between tooth-shaped projections in the trough built on the switch apparatus. During the shifting carried out thereafter, the dogs are shifted under the projections and moved into engagement. A catch is located in the trough, which catch is integrally formed on the movable contact carrier of the switch apparatus and which catch upon shifting of the auxiliary contact block is moved in the coulisse of the coupling member formed on the auxiliary contact carrier. This form locked and releasable coupling is safeguarded against a shifting by means of locking members.

Abstract: At least one actuating or cut-off spring is provided which is compressed in the cut-on or closed position of the switch and is coupled to an actuating linkage or rod leading to movable contacts of the switch. An arrangement is provided to variably modify the force exerted by the actuating spring on the actuating linkage in relation to the stroke. This arrangement consists of a force transmission device arranged between the actuating spring and the actuating linkage. The force transmission device permits taking into account the type of switching stroke to be executed and optimally adapting the force pattern during a switch cut-off stroke thereto. The variation of the force pattern during the switch closing or cut-on stroke is not symmetrical to that of the switch opening or cut-off stroke. The force transmission characteristics of the force transmission device are different according to the requirements of the switching stroke to be executed.

Abstract: A series connection of an auxiliary switching position and a cut-on resistor is connected parallel to at least one primary switching position. A common drive rod is provided with which there is coupled a transmission system operatively associated with the primary switching position as well as a transmission system operatively associated with the auxiliary switching position. The transmission system associated with the auxiliary switching position comprises a cam cooperating with a follower or entrainment member mounted to an actuator rod leading to the auxiliary switching position. For positively controlling the sequence of movements without having to tension a spring during the cut-on of the auxiliary switching position the cam comprises a stationary cam or guide track containing a closed loop engaged by the follower member.

Abstract: A stationary contact element and a movable contact element are coupled to a drive unit. The movable contact element is surrounded by a co-movable blast nozzle which has an inlet flow communicating with a pump chamber surrounded by a pump cylinder. The pump cylinder is conjointly movable with the blast nozzle and the pump chamber contains an extinguishing gas which is pressurizable during a cut-off stroke. The pump chamber is bounded by the blast nozzle at one of its ends and by a spring-biased pump piston at its opposite end which is displaceable to a limited extent when the pressure in the pump chamber increases. A shock absorber is operatively associated with the spring-biased pump piston. To effectively attenuate the high-frequency pressure peaks generated by the switching arc and retroacting into the pump chamber the shock absorber and the spring biasing or supporting the pump piston are arranged such that the shock absorber only responds at the end of the stroke of the spring supporting the pump piston.

Abstract: The transducer comprises an armature and a core. Both pieces are E-shaped, and their geometrical dimensions are chosen so that when their central legs come into mutual contact, air gaps still exist between both pairs of outer legs where these face each other. A coil bobbin is fixed to the core and forms a straight guide for the central leg of the armature. The frontal surfaces of the outer legs are chamfered so that the limiting surfaces of the air gaps are inclined with respect to the travel direction of the armature. In order to minimize the hum, a short-circuit ring is embedded into the central leg of the core.