Abstract: An insulator-type gas circuit interrupter which comprises a movable contact and a stationary contact for closing and separating a main circuit and an insulator tube in which an arc-extinguishing chamber of a frustoconical configuration is defined. The movable contact is disposed in the frustoconical arc-extinguishing chamber at its smaller inner diameter side, and the stationary contact is disposed in the frustoconical arc-extinguishing chamber at its larger inner diameter side. An electrically insulating gas is sealed inside of the frustoconical arc-extinguishing chamber.

Abstract: A vacuum switch chamber includes a ceramic body having two ends, two cylinder halves defining an encompassing parting line between the halves and an internal groove along the parting line. Metal caps close both of the ends. Mutually movable conductor bolts penetrate the ends. Switch contacts are disposed on the conductor bolts at a switch location. A two-part shield surrounds the switch location and has bent, adjoining, axially oriented, intermeshing inner and outer ends engaging the internal groove and spanning the parting line. The outer end has tabs distributed over the periphery of the shield and oriented toward the ceramic body.

Abstract: A puffer SF6 circuit breaker comprises a pair of separable contacts with formation of a breaking gap, a piston-cylinder assembly to compress the gas when the movable contact is actuated to the open position, and a puffer nozzle designed to channel the gas outflow to the breaking gap so as to cool the arc by forced convection. The nozzle is totally or partially made of transparent or translucent insulating material to allow a part of the energy to be removed by radiation.

Abstract: Contact pieces for vacuum switches with axial magnetic field are designed e.g. as cup contacts with slotting in the same direction which support a diskshaped contact body and have means for the suppression of eddy currents. According to the invention, the contact bodies (10, 20, 30, 40, 50) have, at least on their backside, radial areas (15, 25, 35, 45, 55) of markedly lower electrical conductivity than the base material. Such radial areas may be, grooves (15 to 18) on the backside (12) of the contact body (10), diffusion zones (25, 35) of additives reducing the electrical conductivity of the base material, or combinations of the two. If the contact bodies (40,50) are made by powder metallurgical methods, it is also possible to provide the radial areas during production as fillings (45) or as molded parts (55) of a material of lower electrical conductivity than that of the base material.

Abstract: There is disclosed an arc extinction chamber unit for assembly into a multipolar circuit breaker. This chamber unit is composed of arc extinction chambers provided one for each pole, and coupling arms for connecting the chambers to each other. The chambers and coupling arms are molded into one unitary body. Each chamber can contain a generated arc gas pressure, preventing the arc gas pressure being vented to the outer box of the circuit breaker, thereby reducing the stress on the outer box. The arc extinction chamber unit includes restraining arms which connect to the walls of the circuit breaker outer box, further strengthening the box. Each arc extinction chamber contains grooves in the inner wall for easy insertion of grids. The grids are configured with V-shaped indentations. The integral construction of the chamber units and coupling arms provides for assembly into the circuit breaker in a single assembly step.

Abstract: A grounding switch device for a metal-clad switchgear is adapted to be inserted into a standard circuit breaker cell allows the bus and line conductors within the switchgear assembly to be grounded for maintenance. A plurality of fixed and selectable test ports are provided to facilitate various electrical tests. The ground switch device is disposed on a frame and contains a ground contact assembly for providing sliding contact between the ground switch device and the ground bus within the circuit breaker cell. The ground contact assembly is in electrical contact with a movable contact. The movable contact is adapted to engage a stationary contact mounted on a mounting plate, attached to the frame by way of an insulator. A selector switch assembly connects the stationary contact to either the upper bus terminals or line terminals in the metal-clad switchgear assembly. The contact portion of the movable contact is U-shaped having two spaced-apart blades.

Abstract: Vacuum interrupters having improved structural rigidity and internal vacuum integrity are provided for use in vacuum circuit breakers. Due to the design and construction of the endcap assemblies, the vacuum interrupters require a reduced total length of brazed seams, and the incidence of vacuum loss due to faulty seams is thereby reduced. An improved stationary terminal assembly including a reinforcing member providing increased structural rigidity is also provided.

Abstract: A multipole circuit breaker of a type with a mechanism pole having a switching mechanism in which adjacent poles are disposed in opposition to the mechanism pole with an interphase wall therebetween and each having an internal attachment such as an alarm switch or the like but no switching mechanism. A latch engages a cradle of the switching mechanism and is arranged to be actuated by an automatic tripping device. A supporting shaft rotatably supports the latch, an a lever fixed on the supporting shaft engages the cradle. Actuators are fixed on the supporting shaft so as to engage the internal attachment of the respect adjacent poles. The supporting shaft is made of metal. Insulating caps are inserted and fixed onto end portions of the supporting shaft, the supporting shaft passing at portions of the insulating caps through the interphase walls. The actuators are inserted and fixed onto the insulating caps.

Abstract: A molded case circuit breaker movable contact arm electrically connects with the circuit breaker load terminal without requiring a flexible electrical conducting braid. The contact arm is pivotally arranged within a contact arm support to which the load terminal lug is attached. The contact arm pivot pin is supported on a pair of parallel support posts extending from the contact arm support and a pair of bifurcated shunt plates are positioned on the pivot pin, one on each side of the contact arm to promote good electric transport between the contact arm and the support posts during short circuit conditions without interfering with the rotational movement of the contact arm.

Abstract: A circuit breaker auxiliary switch structure characterized by a contact arm carrying a first contact movable between open and closed positions with a second contact. An auxiliary switch is disposed in the path of movement of the contact arm and operable to open or close an auxiliary circuit associated with a circuit breaker.

Abstract: A contact blade for a circuit breaker configured such that the current path in the blade produces a magnetic field which affects an arc present at the contact of the blade. The configuration of the blade produces a substantially U-shaped current loop in the blade, wherein one leg of the current loop has its main component substantially parallel to, but in the direction opposite to, the main component of the current in the second leg of the loop. When an arc is formed at the contact, the current from the second leg flows through the contact and into an arc, while the current in the first leg of the loop produces a magnetic field which acts upon the arc and forces the arc off of and away from the contact.

Abstract: A single piece contact barrier for separating and maintaining the spacing of the contact blades in a circuit breaker. The barrier is also adapted to form an insulating barrier between the contact blades and produce an arc quenching vapor. Under certain circumstances, when one contact and its associated contact are separated, an arc is formed between the contacts. The heat generated by the arc causes the barrier to vaporize in near the arc such that the vapor tends to quench the arc.

Abstract: A pivoting electrical connected useable in a molded case circuit breaker including a pair of contact plates for contacting the circular contact member of a contact carrying arm. The pivoting electrical connection provides at least three contact locations between the contact plates and the circular contact member. The contact locations provide current paths between a first terminal coupled to the contact plates and an electrical contact fixed to the contact carrying arm. The pivoting electrical connection allows the contact on the arm and an electrical contact coupled to a second terminal to be opened and closed.

Abstract: A pair of electrodes connected to conductors through joining means respectively are arranged in a vacuum switch tube such that current passes when they come into contact, and does not pass when they separate. At least part of the electrodes, the conductors or the joining means is made of materials with vibration absorbing properties.

Abstract: A semiconductor integrated circuit device in which a wiring layer which supplies a predetermined operation voltage to an electronic circuit has a decreased parasitic impedance. The wiring layer is constituted by a first path and a second path that are connected in parallel between a connection pad and the electronic circuit, or a second wiring layer that constitutes an AC loop is formed close to the first wiring layer which supplies the operation voltage, or the above-mentioned two structures are employed in combination.

Abstract: In an electric high-voltage circuit breaker with a hydraulic drive, the piston rod, going through a seal, is brought out of the hydraulic cylinder in order to actuate the movable contact via a reversing gear and a switching rod. The piston rod is arranged in a protective tube and provided with a guiding ring which guides the piston rod in the protective tube. The piston rod is coupled to a fork head which engages the reversing gear. The hydraulic cylinder is located between two housings for drive parts, the interior spaces of which are heated and ventilated or exhausted. To prevent the formation of condensate water in the interior of the protective tube, there are provided in the hydraulic cylinder passages which connect the interior of the lower housing and the interior of the upper housing, respectively, to the interior of the protective tube. Thereby, the heated air is conducted from the lower housing via the interior of the protective tube into the interior of the upper housing.

Abstract: A blast arrangement for gas-blast circuit breakers including a blast cylinder and a blast plunger, the blast plunger being designed in two pieces, arranged axially, the two pieces being rigidly coupled via spacers parallel to the axis and holding between them the sealing rings which form a return valve.

Abstract: An arc-rotating magnetic blast coil for the contact element of an electric switch, the coil comprising, in particular, a conducting cup (1) which is cylindrical in shape and which is connected to a current inlet (33), a winding (23) disposed inside the cup to produce a magnetic field along the axis of the cup and having one end (14) connected to the cup, a conducting core (7) connected to the other end (12) of the winding and situated in the center of the winding, and a fixed circuit-breaking contact disposed ahead of the coil relative to said cup within the magnetic field produced thereby and electrically connected to said core, characterized in that the winding is constituted by means of a flat conductor (8) comprising a plurality of turns wound on the core together with an insulating sheet, and in that means (16, 9) are provided for putting the winding under compression.

Abstract: An SF.sub.6 puffer interrupter switch includes one or more viewing windows located on the housing. The viewing windows are strategically located on a sidewall of the housing to allow all of the puffer interrupter assemblies within the housing to be viewed from one viewing window. The puffer interrupter assemblies that house the interrupting contacts are provided with clear puffer tubes to allow the operator to verify the position of the interrupting contacts within the puffer tubes from the viewing window located on the housing. The SF.sub.6 interrupter switch housing is pressurized. By assembling the viewing window assemblies from the inside of the housing, the positive pressure within the housing assists in sealing the viewing window assemblies to minimize the leakage of the SF.sub.6 gas. Additional viewing windows may be used to allow light inside the housing.

Abstract: A circuit breaker with expansion and rotating arc in sulphur hexafluoride comprising a metal breaking chamber supporting a stationary main contact capable of cooperating with a movable main contact. The breaking chamber comprises an insulating end plate away from the breaking area and an opposite metal end plate close to the breaking area and supporting a coil or a permanent blowout magnet by rotation of the arc drawn between the arcing contacts housed inside the breaking chamber.