Abstract: An electro-magnetically controlled apparatus is provided having in a box an electro-magnet adapted to move an armature subjected to the force of a return spring developing an initial force, a contact holder associated with the armature and presenting side by side a plurality of pairs of housings each comprising a lower housing close to the armature, and an upper housing placed above, a plurality of mobile reversible bridge contacts, respectively placed in the respective housings and each receiving the action of a pressure spring which urges them against a cross piece separating two housings of a pair, these bridge contacts being adapted to cooperate each one with a pair of fixed reversible contacts disposed in the case so as to form one of the possible configurations of opening or closing switches placed in power or signalling circuits. The contact holder (9) comprises four pairs or superimposed housings (10.sub.U --11.sub.U, 10.sub.V --11.sub.V, 10.sub.W --11.sub.W, 10.sub.X --11.sub.X).

Abstract: A molded case circuit breaker apparatus is taught with an operating mechanism which is triggered in response to the movement of a trip bar. The trip bar in turn is responsive to current flowing in the main terminals of the circuit breaker apparatus. The trip bar is responsive to electrothermal conditions as a gradual overload increases. It is also responsive to a short circuit condition due to a magnetic reaction between an armature and an electromagnet. The armature is flexibly attached to the trip bar for flexible movement in one direction and non-flexible movement in the other direction so that a short circuit may be accommodated by a relatively small air gap by non-flexible movement of the armature and the trip bar to cause a tripping operation.

Abstract: A fail-safe solenoid switching mechanism (11) includes separate solenoids (17,18) for switchings to "armed" and "safed" statuses. A manually operated safing mechanism (19) has a capability of overriding the solenoids (17,18) to establish the switching mechanism (11) in the "safed" status. The manually operated safing mechanism (19) is operated by a special tool (41), which is retained by the switching mechanism (11) whenever the manually operated safing mechanism (19) is engaged. The manually operated safing mechanism (19) is held in engagement by a catch (22) whenever the solenoid (17) for arming is powered, thereby preventing the specialized tool from being removed and the switching mechanism (11) from inadvertently switching to the "armed" status. Further status indications are provided by a flag (54) which can be used to directly read the status of the switching assembly (11).The switching assembly (11) uses a reciprocating switch (15) to establish make-or-break connections.

Abstract: A relay for switching of ultra high frequency circuits has three spaced-apart coaxial type contacts including a central or common contact. Two contact blades are disposed in opposed relation to the coaxial contact for alternate movement from a first position in which one rigid contact engages the central coaxial contact and one side contact while the other rigid contact is grounded, and a second position in which the other rigid contact engages the central contact and another coaxial contact and the first rigid contact is grounded. Pusher elements connected to the respective rigid contacts are connected to opposite sides of a leaf spring supported at its center. A pivotal armature alternately presses on one end or the other of a leaf spring to drive one rigid contact against its two coaxial contacts and to permit the other end of the leaf spring to pull the other rigid contact into engagement with the ground plane.

Abstract: A contactor has a movable contact assembly which is connected to the magnet armature in such a way that the contact assembly moves translatorily in the same direction as the armature between a closed and an open position. The contact assembly comprises a movable main contact with relatively small contact elements of silver alloy and a movable arcing contact with contact elements of silver-free material. The arcing contact makes and breaks the main current, whereas the main contact carries almost the entire current in closed position. The contacts have separate contact pressure springs. The contactor has at least one opening spring which is obliquely directed in relation to the direction of motion of the armature and is clamped between two bearing points, of which one is fixed whereas the other, upon operation of the electric switch, is displaced together with the armature in the same direction of motion.

Abstract: A contactor apparatus comprising means for automatically opening power circuits should faults occur and a local control member.This apparatus comprises a plurality of power lines (8) each comprising a power contact (2) adapted to be opened during a short circuit by a striker (28), a coil (13) and a bimetallic strip (14), responding to smaller overloads. The elements responsive to overcurrents act on a cascade of sudden tripping devices (19) (17) (31) which govern the positions of the local control member (18) and act on a control switch (4) placed in series with the electromagnet (1).Such an apparatus is advantageously used in installations where protection of the lines, remote control and local control of the consumer apparatus are desired.

Abstract: A circuit breaker comprising two or more sections connected in parallel with each other. Each section of the circuit breaker comprises an electromagnetic sensing device and a pair of relatively movable contacts. The electromagnetic sensing devices are electrically connected at one of their ends to the load terminals. The load terminals are electrically connected in parallel with each other. The electromagnetic sensing devices are electrically connected at their other ends to each other and are electrically connected to all of the movable contacts which are themselves all electrically connected together. The stationary contacts are connected to line terminals which are also electrically connected in parallel with each other.

Abstract: The relay exhibits a coil body on whose one flange an armature retaining element is integrated over elastic stays. A bar-shaped armature is secured in the frame-like armature retaining element, whereby the elastic flexural stays serve as a bearing for the armature. Additional fastening parts for the armature are thereby eliminated. A friction-free armature seating also thereby derives.

Abstract: A circuit breaker having a contact opening and closing mechanism including a contact actuator member which is moved between a first position and a second position to close and open the contacts. The movable contact is mounted on one end of an elongated contact carrier which is connected in its central region by means of a pin and slot combination (providing a free floating coupling arrangement) to the contact actuator member. A compression spring is positioned between the contact actuator member and a portion of the contact carrier between the pin and slot combination and the other end of the contact carrier. When the contact actuator member is in the first position, the compression spring produces a torque in one direction about the other end of the contact carrier forcing the contacts closed.

Abstract: Switchgear consisting of a polarized magnetic drive and a contact apparatus placed thereabove is disclosed. The contact apparatus includes an adjusting slider which is movable to actuate bridge contacts and is operably connected to return springs which urge it to a neutral position. To obtain two or three stable positions of the adjusting slide without constructional modifications of the switchgear, the coil form for the magnetic drive is divided into two chambers which are spaced apart, are arranged side by side, and accommodate two coil windings. Between the coil forms and symmetrical to the longitudinal axis of the coil form is connected to a permanent magnet arrangement which is polarized at right angles to the longitudinal axis of the coil form and has a central through-port for a central armature.

Abstract: A coupling piece (12) which is connected to a mobile component (18) of the contactor, has two stepped thrust surfaces (19, 20), each able to cooperate with one of two locking levers, (23, 24), both of which are repelled by an electromagnet (32) when the contactor is turned off. This device is particularly advantageous when the mobile components of the contactors move over different distances.

Abstract: A relay has a bar-shaped armature which is seated at a location of one coil end over an armature carrier comprised of insulating material. For the purpose of seating, taut bands projecting in a direction of the rotational axis of the armature are integrated on the armature carrier, said taut bands forming suspension heads at their free ends. The armature carrier is engagably secured over said suspension heads between fork-shaped ends of retaining arms integrated on the coil body. Given movement of the armature, the taut bands are twisted so that a friction-free armature bearing is created.

Abstract: A movable contact bridge (12) is associated with contact carrier (7) by means of a stirrup (28), a pressure spring (25) and a resilient blade (45). The stirrup has two hooks (35, 36) which hold the blade in place and facilitate removal and positioning thereof because of the gap (60) separating these hooks. This contact bridge is advantageously used in contactors of minimum rated power greater than 100 amps.

Abstract: A multiple pole circuit breaker comprises stationary and movable contacts in each pole, with a cross bar extending between the poles and causing concerted movement of the movable contacts. An operating mechanism effects movement of the movable contacts between open and closed positions, and a resettable undervoltage release mechanism cooperates with the operating mechanism to effect movement of the movable contacts. The undervoltage release mechanism operates to move the movable contacts from the closed to open position upon the occurrence of voltage levels less than a predetermined value, with the undervoltage release mechanism being reset by physical contact with the cross bar as the cross bar moves with the movable contacts from the closed to open positions.

Abstract: A so-called blow-off type current limiting circuit breaker is constructed with a contact pressure spring that also holds the contact arm in open contact position when the contacts are blown open by electrodynamic forces. A multi-section cam means transmits contact opening and closing forces produced by a spring powered overcenter toggle type operating mechanism to the movable contact arm. A follower on the latter is biased into engagement with the cam means by the contact pressure spring. The cam means is so constructed that during contact blow-off the movable contact arm requires relatively little motion to move overcenter in the opening direction. One section of the cam means is constructed so that when the contact arm moves overcenter in the opening direction during contact blowoff, speed of the contact arm is controlled to an extent that contact rebound does not become a problem.

Abstract: A miniature DIL relay comprising a motor unit and a casing (1) housing the motor unit (2) and including opposed sidewalls (14, 14a) of insulating plastics material, each sidewall having embedded therein a conductor frame providing external connection terminals (15, 16, 17) of the relay and supporting the fixed and moving relay contacts (8, 11, 6, 7) in the casing, the motor unit having a bobbin with a pair of external connection terminals (18, 21) mounted thereon which project through the casing and which are connected to the motor unit winding.

Abstract: A three-arm mechanical interlock for a vacuum contactor having one or more vacuum interrupters. The first two arms of the interlock multiply the angular rotation of a shaft connected to the moveable contacts of the interrupters. Shaft travel of about 4 degrees is increased to about 12 degrees at the end of the second arm of the interlock allowing the interlock pieces to be pressed rather than being machined. After the contactor has been opened, the third arm of the interlock transfers position to block the path of the other arms preventing the accidental closing of the contactor. The contactor may not be reclosed until the third arm is transferred back to its original position. Flat surfaces, preferably parallel, can be provided on the shaft and the bore of the first arm attached thereto to provide a self-aligning connection. An extension member can be fastened to the second arm to provide an additional interlock to another device.

Abstract: A removable group of auxiliary switches is mounted on the upper surface (4) of the contactor housing by hinging means (28, 29) and resilient locking (32, 33) placed respectively in the area of the base (8) and of partitions (5) which separate the principal terminals (6). The group comprises two switches (make and break). Coupling in this manner makes it possible to increase the number of auxiliary switches without increasing the contactor's frontal or lateral congestion.

Abstract: A so-called blow-off type current limiting circuit breaker is provided with an elongated movable contact arm that is pivotally mounted at one end thereof on a pin that projects from opposite sides of a support. The contact arm is constructed of parallel sections that are biased toward one another, by spring means disposed remote from the support, with the support being resiliently clamped between the sections to provide a good electrical connection between the support and contact arm. The pivot pin extends through aligned enlarged pivot apertures in the parallel sections to facilitate weld breaking. A wall of each pivot aperture is disposed to cooperate with the pivot pin to achieve a camming action that moves the contact arm slightly lengthwise after initial butting engagement of the circuit breaker main contacts to wipe the engaged contacts with respect to one another.

Abstract: A relay comprises an elongate armature which is seated at one end in a carrier of insulating material. Movable contact springs are anchored in the carrier and comprise extensions which emerge from the carrier and are secured in a base with respective fastening portions. Such extension of the respective contact springs forms a terminal lug integrated as a one-piece structure with the contact, as well as a friction-free bearing for the armature without provision of an additional bearing element.