Abstract: A contactor includes a fixed iron core, a movable iron core, an operation coil, a first crossbar, a tripping spring, and a second crossbar. The contactor includes a push spring to push a movable contact toward a fixed contact, a trip coil connected to the fixed contact, and a plunger that is operated by an electromagnetic force generated in the trip coil when a current of a predetermined value or higher flows through the trip coil. The contactor includes an opening lever to push the second crossbar in a direction away from the first crossbar in conjunction with the operation of the plunger.

Abstract: A stationary core is in an exciting coil. A yoke covers an outer periphery and an axial end of the exciting coil to form a magnetic circuit and has an opening portion. The movable core faces the stationary core through the opening portion and is attracted toward the stationary core on energization of the exciting coil. A return spring urges the movable core against the attraction direction. A first gap is formed between the stationary core and the movable core on deenergization of the exciting coil. A second gap is formed between the yoke and the movable core on deenergization of the exciting coil. The second gap allows the yoke and the movable core to generate an attractive force therebetween on energization of the exciting coil. The return spring is made of a magnetic material to magnetically bridge the first gap or the second gap.

Abstract: Disclosed is a relay device including a stator having first and second stationary contact points spaced apart from each other; a movable element provided so as to be movable in a first direction toward the stator and in a second direction away from the stator, the movable element being electrically connected with the stator by making contact with the first and second stationary contact points; and an actuator for moving the movable element in the first or second direction, wherein the movable element includes: a first movable part having a first contact surface formed thereon, which can make contact with the first stationary contact point; and a second movable part having second and third contact surfaces formed thereon, which can make contact with the second stationary contact point, wherein the second and third contact surfaces make contact with the second stationary contact point at different positions.

Abstract: A high-voltage large-current relay includes an electromagnet, at least one fixed transmission contact, at least one movable transmission contact, at least one fixed arc-striking contact, and at least one movable arc-striking contact. The fixed transmission contact and movable transmission contact are corresponsive to each other, and the fixed arc-striking contact and movable arc-striking contact are corresponsive to each other. The relay further includes at least one arc-striking spring plate and at least one transmission spring plate for installing the movable transmission contact and movable arc-striking contact respectively. The movable arc-striking contact is smaller than the movable transmission contact, and the arc-striking spring plate and the transmission spring plate are operated together.

Abstract: Disclosed is a magnetic contactor. A free space in which a DC converting circuit is provided is in a product can be secured by changing shapes of the movable core and the fixed core, and thus, in association with a low-capacity product, external AC power may be converted into DC power even without enlarging a size of a product. Also, a normal position member may be included in a movable core, and may induce the movable core to the original position, and thus, a mechanical mechanism relationship between the switch manipulating part included in the movable core and the other element is maintained.

Abstract: An electromagnetic relay, includes: a first movable contact that comes in contact with a first fixed contact; a second movable contact that comes in contact with a second fixed contact; a first elastic body that biases the first movable contact; a second elastic body that biases the second movable contact; a pressing member that presses the first elastic body and contacts the first movable contact to the first fixed contact, presses the second elastic body and contacts the second movable contact to the second fixed contact; wherein the pressing member contacts the second movable contact to the second fixed contact before contacting the first movable contact to the first fixed contact.

Abstract: An auxiliary contact mechanism of a magnetic contactor includes: a contact support member having an axial recess portion formed in the center in a vertical direction; a stationary contact; a movable contact; a permanent magnet position-fixed to the contact support member and applying magnetic attractive force to restrain the movable contact so that the circuit closing position that the movable contact is in contact with the stationary contact is maintained; and a slide movable supporter having a pressing projection portion formed at a position separated apart by a predetermined distance from the movable contact when in the circuit closing position and pushing the movable contact to release the movable contact from a restrained state after a predetermined delay time has passed, when the slide movable supporter is moved downwardly upon receiving downward pressing force by the main contact slide support member.

Abstract: A triggering unit includes a tappet having a moving bearing, a power accumulator, a holding device and a printed circuit board coil. In the normal state the power accumulator acts upon the tappet with a power accumulator force in the direction of the first stop position and the holding device holds the tappet with a holding force in the second stop position. A printed circuit board coil force can be generated by an activation of the printed circuit board coil. The power accumulator, the holding device and the printed circuit board coil are formed such that the tappet rests in the second stop position in the inactive state of the printed circuit board coil and through an activation of the printed circuit board coil, the tappet assumes the first stop position such that the triggered status is given.

Abstract: Disclosed is an electromagnetic switching device. The electromagnetic switching device includes a housing, a fixed contact point inside the housing, a movable contact point positioned under the fixed contact point to repeatedly perform contact with the fixed contact point and separation from the fixed contact point, a shaft coupled with the movable contact point, a return spring to continuously press the shaft downward, and a movable core coupled with the shaft. The shaft includes a pressing surface directed downward, and the movable core is provided to make contact with an upper end of the pressing surface, so that the movable core presses the pressing surface to move up the pressing surface if the movable core and the shaft move up, and the pressing surface presses the movable core downward to push down the movable core if the movable core and the shaft move down.

Abstract: Provided is an electromagnetic contactor (20) which transmits an attraction movement of a movable core (8d) of an electromagnet (8), via a drive lever (9), to a movable contact support (7a) that is movable in parallel with the movable core (8d), wherein an urging portion (21) for applying an urging force to the movable core (8d) is provided such that the movable core (8d) is held at a movable core initial position which is apart from a fixed core (8c) and does not allow engagement with the movable contact support (7a).

Abstract: A method and apparatus for controlling operation of a safety switch assembly having a number of fixed and movable contacts, a control mechanism that alters the conducting state of the contacts, and a magnetisable member that extends between alternate portions of the safety switch assembly. The safety switch assembly includes a magnetically operable electrical switch that is positioned proximate the magnetisable material such that changes in the magnetic condition of the magnetisable material alter the conducting state of the magnetically operable electrical switch.

Abstract: A mover assembly of a circuit breaker is provided. A mover assembly of a circuit breaker according to one aspect includes: a terminal fixed within a circuit breaker; a connector coupled to the terminal; a plurality of movers rotatably installed in the connector; and an elastic member applying elastic force to the movers to tightly attach the movers to the connector, wherein each of the movers includes a first mover and a second mover and the elastic member is positioned between the first mover and the second mover.

Abstract: Disclosed herein is a relay module for a vehicle battery system. The relay module includes a movable unit configured to be moved by a magnetic field generated by a coil and a return spring within a relay. This movable unit controls a state of an electrical connection between relay electrodes. A microsensor installed between the movable unit and a fixed unit maintains a fixed location relative to the movable unit and is configured to induce a variation in an electrical physical quantity depending on a variation in a location of the movable unit relative to the fixed unit.

Abstract: An electromagnet device is configured to generate a magnetic attractive force between a stationary core and a movable core when electricity is applied to a coil, so that the movable core is moved in a direction for coming into contact with the stationary core, and a movable shaft is moved in a direction in which a first end face of the movable shaft separates from a movable terminal. After the movable contact comes in contact with the fixed contact, the movable core moves further in a direction for coming into contact with the stationary core. A yoke made of a magnetic body is disposed between the movable terminal and the first end of the movable shaft.

Abstract: Provided are an electronic switching device and a method for manufacturing the same. The electronic switching device includes a fixed unit including a fixed unit body defining an outer appearance thereof and a fixed contact part disposed within the fixed unit body, a movable unit including a movable contact part selectively contacting the fixed contact part to supply current, a moving part provided in the movable unit to guide a movement of the movable contact part toward the fixed contact part, a coil to which power is applied to move the moving part, and an elastic member that is elastically deformable while the moving part moves. At least one of the fixed unit and the moving part has a through hole so that an inner component of the fixed unit or the moving part communicates with the outside to allow a preset signal to pass therethrough.

Abstract: Provided is an electromagnetic contactor (20) which transmits an attraction movement of a movable core (8d) of an electromagnet (8), via a drive lever (9), to a movable contact support (7a) that is movable in parallel with the movable core (8d), wherein an urging portion (21) for applying an urging force to the movable core (8d) is provided such that the movable core (8d) is held at a movable core initial position which is apart from a fixed core (8c) and does not allow engagement with the movable contact support (7a).

Abstract: An electromagnetic relay includes a fixed iron core, a movable iron core opposed to the fixed iron core, a magnetizing coil for generating a magnetic force when energized to make the movable iron core attracted by the fixed iron core, a movable contact coupled with the movable iron core, a fixed contact opposed to be contacted with the movable contact, a reset spring for reset the movable iron core, and a repulsive-force generating coil. The repulsive-force generating coil generates a magnetic field opposing to a remaining magnetic field of the movable iron core while the movable iron core moves from a position where the movable contact has passed through an arc field where an arc discharge between movable contact and the fixed contact to be occurred to a position where the movable iron core is just about to expand the reset spring fully.

Abstract: An object of the present invention is to provide a contact switching device having a smaller height dimension. For this, there is provided a contact switching device in which a movable iron core (142) provided at one end portion of a movable shaft (145) is attracted to a fixed iron core (138), based on excitation and degauss of an electromagnet portion, by which the movable shaft (145) reciprocates in a shaft center direction, and a movable contact (148a) of a movable contact piece (148) arranged at another end portion of the movable shaft (145) contacts and departs from a fixed contact (133a). Two coil springs (147a, 147b) different in length and diameter are put on the movable shaft (145), and one of the coil springs (147a) is arranged inside the other coil spring (147b).

Abstract: An electromagnetic relay includes a fixed iron core; a movable iron core disposed opposing to the fixed iron core; a coil for generating a magnetic force when energized to make the movable iron core attracted by the fixed iron core; a movable contact coupled with the movable iron core; a fixed contact disposed opposing to the movable contact; and a reset spring for resetting the movable iron core when the coil is de-energized. The movable iron core includes a base body to which an expanding force of the reset spring is applied and a movable member provided independently from the base body. The movable member is attracted by the fixed iron core when the coil is energized to move integrally with the base body, and is reset by the expanding force of the reset spring when the coil is de-energized to slide independently from the base body.

Abstract: An electromagnetic relay includes a contact including a movable spring having a base end fixed to a bottom of a housing and a tip end provided with a movable contact, and a fixed spring having a base end fixed to the bottom of the housing and a tip end provided with a fixed contact. The movable contact is provided opposite to the fixed contact so as to come in contact with the fixed contact or move away therefrom. The housing has a protrusion protruding toward a side of the fixed contact opposite to a side facing the movable contact.

Abstract: A circuit breaker comprises a latching plate rotatably coupled to a moveable plate, and tensile type latching springs, each latching spring having two ends fixed to the latching plate and the moveable plate, respectively. Time taken for a moveable contact to be lifted up from a contact time point between the moveable contact and a fixed contact may be shortened, and thus a time duration for which an accident current flows may be reduced. Accordingly, the amount of energy applied to the circuit breaker may be reduced, and a breaking function of the circuit breaker may be enhanced. Furthermore, since a contact pressure between the moveable contact and the fixed contact has a constant change, a reliability on a conductive state of the moveable contact and the fixed contact may be enhanced.

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: An apparatus (1) monitors a protective device (2) of a machine (4). The apparatus (1) has a switch housing (22) with a switch head (24) and an actuator (8). In the closed state of the protective device (2), the actuator interacts with the switch head (24) with that closed state being signaled. The apparatus (1) has a tumbler device (20) with a tumbler element (30) mounted movably in the apparatus (1) to lock releasably the closed state. The tumbler device (20) has a permanent magnet (34). The magnetic force fixes the tumbler element (30) in a first position when the power supply to the apparatus (1) is switched off to lock the closed state of the protective device (2), in a second position with the tumbler device (20) not locking the closed state.

Abstract: An apparatus (1) for monitoring the state of a protective device (2) of a machine (4) in particular is a safety switch for monitoring the closed state of a protective door or the like. The apparatus (1) has a switch housing (22) with a switch head (24) and an actuator (8). In the closed state of the protective device (2), the actuator interacts with the switch head (24) and, as a result, the closed state of the protective device (2) can be signaled. The apparatus (1) has a tumbler device (20) with a tumbler element (30) mounted movably in the apparatus (1) and by which the closed state of the protective device (2) can be locked releasably. The tumbler device (20) has at least one permanent magnet (34).

Abstract: Disclosed is an electromagnetic switching apparatus capable of reducing noise occurring when a movable contact comes in contact with or is separated from a fixed contact, and capable of enhancing a function to extinguish arcs. The electromagnetic switching apparatus includes a fixed terminal fixed in a manner to penetrate through a housing, a fixed contact configured to approach to or to be separated from the fixed terminal, an elastic member fixed between the fixed terminal and the fixed contact, and providing an elastic force to a direction to separate the fixed contact from the fixed terminal, a movable contact configured to contact or to be separated from the fixed terminal, and a moving unit configured to move the movable contact so as to contact or to be separated from the fixed contact.

Abstract: An apparatus for auxiliary contact of circuit breaker is disclosed that is capable of preventing an erroneous operation of and damage to an ON/OFF switch caused by over-stroke of a linkage mounted at an auxiliary contact apparatus, and enhancing reliability despite repeated opening/closing thereof.

Abstract: Electrical switching device, especially a high-frequency switching device, with at least one oblong electrical switching element, which is arranged with one contact end between two fixed-contact elements spaced a transverse distance from one another and can be moved by two adjustment elements forming a transverse movement drive transversely to a longitudinal direction optionally towards the one or the other fixed-contact element. The adjustment elements are disposed laterally alongside the switching element and can be moved transversely to and from the switching element. In order to improve the transverse movement drive for the switching element, the switching element-comprises magnetic material, wherein the adjustment elements are formed by magnets.

Abstract: A circuit breaker includes a vacuum valve, an electromagnet including a first coil for driving an operating shaft of the vacuum valve toward an opening direction by electromagnetic repulsion, a movable core and a permanent magnet. Further, an operating mechanism is provided which excites the first coil to close the vacuum valve, holds the vacuum valve closed by an attractive force of the permanent magnet and excites the first coil in a direction reverse to an excitation direction in closing operation to open the vacuum valve. In the circuit breaker, together with the first coil, a second coil is disposed which is excited simultaneously with an electromagnetic repulsion coil for a quick opening operation by electromagnetic repulsion is provided in the electromagnet.

Abstract: A relay includes a contact point block having a support shaft with both ends spanning a contact point base, a plunger having a movable contact at a lower end thereof, and a movable iron piece configured to drive the plunger and to have a plate spring. The relay also includes an electromagnetic unit and a base block having a fixed contact point at a position opposite to the movable contact point. The movable iron piece is supported on the supporting shaft. The plunger is inserted through an operation hole of the contact point base. Upper and lower surfaces of the contact point block are held by the electromagnetic unit and the base block. The electromagnetic unit directly fixes the iron core to an upper surface of the contact point base.

Abstract: An electromagnetic relay includes a coil, a movable member, first and second fixed contact supports each having first and second fixed contacts, and a movable body having first and second movable contacts. A third fixed contact is arranged on the second fixed contact support at a position away from a line passing through the first and second fixed contacts, and a third movable contact is arranged on the movable body. When the movable member is driven by electromagnetic force of the coil, the movable contacts contact the fixed contacts at a contact portion between the first fixed contact and the first movable contact, a contact portion between the second fixed contact and the second movable contact, and a contact portion between the third fixed contact and the third movable contact.

Abstract: An electromagnetic relay has an overtravel adjustment to set the gap in the contact arrangement. The armature is actuated by a relay coil and linked to a pusher to drive the pusher to operate the contact system. The pusher includes a rotary dial disposed in a slot on the pusher adjacent to the armature. The rotary adjustment increases or decreases a gap of the contacts to provide an over-travel adjustment. The pusher includes bifurcated tines defining the slot for receiving an armature linkage and the rotary adjustment. The rotary adjustment includes a head and a post depending from the head. The post is disposed within the slot and the head portion in contact with the armature linkage portion. The rotary adjustment sets the distance between the forward edge and the armature to achieve the desired overtravel for the contact arrangement.

Abstract: A method and device are disclosed for safely operating a switching device with at least one main contact, which can be switched on or off, and which has contact elements and a moving contact bridge, and with at least one control magnet, which has a moving armature. During switching on and off, the armature acts upon the contact bridge whereby closing and opening the corresponding main contact. At least one embodiment of the method includes the following: a) identifying whether the moving contact bridge of the at least one main contact has surpassed an opening point after the switching off; and b) interrupting the further operation of the switching device when the opening point has not been surpassed after a predetermined period of time.

Abstract: A spring assembly is provided for a yoke assembly of an electrical switching apparatus including a housing, separable contacts enclosed by the housing, and an operating mechanism structured to open and close the separable contacts. The operating mechanism includes a pole shaft. The yoke assembly is coupled to the pole shaft and is movable among first and second positions corresponding to the separable contacts being closed and open, respectively. The spring assembly includes a number of first springs having a first spring rate and being coupled to the yoke assembly, and a number of second springs having a second spring rate and being coupled to the yoke assembly. The second spring rate is different than the first spring rate. The number of first springs and the number of second springs bias the yoke assembly toward the second position.

Abstract: An electromagnetic relay has a relay coil, an armature, a pusher and a contact system. The armature is actuated by the relay coil, and linked to the pusher to drive the pusher to operate the contact system. A set of stationary contact springs and a set of moveable contact springs have a gap separating them. The moveable contact springs connect to the pusher and to a pivot point. The stationary springs have a notch therein adjacent to the base structure portion. The pusher movement causes the stationary contact springs and the moveable contact springs to engage or disengage, and to automatically adjust the overtravel angle of the stationary contact springs relative to the moveable contact springs by bending the stationary contact spring at the notch of the stationary contact spring.

Abstract: A relay includes a magnetic system provided with an armature and a contact system provided with a first contact and a moveable second contact. An electrically insulating base plate is arranged between the magnetic system and the contact system and has an opening therein. First and second walls extend from the base plate and are arranged between the opening and the magnetic system or the opening and the contact system. An actuator extends between the armature and the contact system through the opening and transfers movement of the armature to the second contact to move the second contact into electrical engagement with the first contact. The actuator has a third wall that extends toward the base plate and between the first and second walls. The first, second, and third walls extend a leakage path of an electrical leakage current between the contact system and the magnetic system.

Abstract: A relay including a coil or solenoid, at least one fixed substrate and a moving substrate, a plurality of braided electrical contact element contacts making contact with pads on the fixed and moving substrates, returning springs mounted on alignment pins, and an optional cover for hermetical sealing. A further embodiment presents a horizontally-moving armature actuated by one or more solenoids.

Abstract: A contact spring assembly is provided for an electrical switching apparatus including a movable contact assembly and a stationary contact assembly having stationary electrical contacts. The movable contact assembly includes a carrier assembly, and movable contact arms pivotably coupled to the carrier assembly and carrying movable electrical contacts. The contact spring assembly includes a first contact spring housing member, a second contact spring housing member coupled to and disposed opposite from the first contact spring housing member, a spring guide disposed between and coupled to at least one of the first and second contact spring housing members and including spring holes, springs received in the spring holes, and sliders coupled to the springs. The springs and sliders individually bias the movable contact arms and movable electrical contacts toward engagement with corresponding stationary electrical contacts. A movable contact assembly and an electrical switching apparatus are also disclosed.

Abstract: The electromagnetic relay of the present invention comprises a base (10), an electromagnet (20) disposed on the base, an armature (30) supported rotatably by the base, a movable spring (40) whose one end has a movable contact (41) and the opposite end is secured to the base, a fixed contact (51) disposed opposite to the movable contact, and a card (60). The card has a coupling part (61) to be coupled to the armature and an insertion hole (62) to which the one end of the movable spring is inserted, and it deforms the movable spring elastically in conjunction with a swing motion of the armature to selectively open or close a connection between the movable contact and the fixed contact. The movable spring has a U-shaped hook formed by bending the one end of the movable spring toward the opposite end side, and the hook can pass through the insertion hole while being pushed by an inner surface of the insertion hole and being deformed elastically, and an end of the hook is engaged with the card.

Abstract: A method and a device are disclosed for the secure operation of a switching device including at least two main contacts which can be switched on and off and which includes respectively, contact pieces and a displaceable contact bridge, and at least one control magnet which includes a displaceable anchor. The anchor acts upon the contact bridge when it is switched on and off such that the corresponding main contact is opened or closed. At least one embodiment of the inventive method includes the following steps: a) release device for a force element remains in a first state in order to interrupt the main contact as long as the main contacts are closed when switched on and open when switched off, and b) the release device are transferred into a second state if at least the main contact is welded after switching off.

Abstract: A method of manufacturing a movable contact unit includes manufacturing a movable contact, sticking the movable contact to a base sheet made of insulating resin, and applying demagnetization to the movable contact so that the residual magnetic flux density is smaller than the operation magnetic flux density of the magnetic sensor. In manufacturing the movable contact, elastic metal plate material is processed into a downwardly opening dome shape to form the movable contact. In a method of manufacturing a switch panel, the movable contact unit is overlaid on a wiring board having a contact, including pair an outer fixed contact and a central fixed contact, that corresponds to the movable contact so that the lower end of the outer periphery of the movable contact is mounted on the outer fixed contact.

Abstract: A switch contact arrangement for a power switch is provided with a device for increasing the contact force acting between switch contacts. The device includes a cavity which is made in a stationary conductive element of the switch contact arrangement in such a manner that the direction of the current in the conductive element adjacent to the stationary switch contact runs essentially perpendicular to the longitudinal direction of the conductive element and therefore essentially parallel to the direction of current in an associated displaceable conductive element. The above-mentioned arrangement is suitable for low-voltage power switches with a selective form, whereby the switch contacts thereof allow a short-circuit current to be guided without premature opening.

Abstract: A movable contact unit arrangement includes a movable contact disposed close to a magnetic sensor. The movable contact unit includes a base sheet made of insulating resin, and a movable contact made of elastic metal plate material and having a downwardly opening dome shape. The movable contact is stuck to the base sheet. The magnetic sensor has an operation magnetic flux density during operation, and the movable contact is a demagnetized movable contact so that a residual magnetic flux density of the movable contact is smaller than the operation flux density of the magnetic sensor.

Abstract: A method of manufacturing a movable contact unit includes manufacturing a movable contact, sticking the movable contact to a base sheet made of insulating resin, and applying demagnetization to the movable contact so that the residual magnetic flux density is smaller than the operation magnetic flux density of the magnetic sensor. In manufacturing the movable contact, elastic metal plate material is processed into a downwardly opening dome shape to form the movable contact. In a method of manufacturing a switch panel, the movable contact unit is overlaid on a wiring board having a contact, including pair an outer fixed contact and a central fixed contact, that corresponds to the movable contact so that the lower end of the outer periphery of the movable contact is mounted on the outer fixed contact.

Abstract: A high-temperature shutdown protecting relay comprises a base; a L copper pin and a N copper pin are provided on the base with resting contacts provided at their bottoms respectively; stretchy copper blades are provided on the base, which are fit to the L copper pin and the N copper pin respectively, with movable contacts provided thereon, which are fit to said resting contacts; a stand is provided on the base and above the stretchy copper blades; grooves are provided on the lower side of the stand with ceramic rods for insulating the stand from the stretchy copper blades embedded therein. The high-temperature shutdown protecting relay provided by the present utility model can keep normal operating property under high temperature.

Abstract: A portable cellular phone is provided which is capable of surely detecting a state of folding of phone bodies by detection of a weak magnetic field produced by a receiver. A first phone body has a Hall integrated circuit (IC) adapted to detect a magnetic flux formed by a receiver. When the first phone body and a second phone body are folded closed, a magnetic flux density of the magnetic flux that is formed by the receiver and passes through the Hall IC is changed by a magnetic material placed in the second phone body.

Abstract: An electromagnetic switch includes a contact holding member connected to a plunger in order to hold a first movable contact. The contact holding member is disposed outside a switch case covering a periphery of an excitation coil. A return spring pushes the plunger back in the opposite direction to a fixed iron core through the contact holding member when electric power supply to the excitation coil is stopped. The return spring is disposed outside the switch case. In this structure, a spring holding portion does not need to be disposed in the fixed iron core and the plunger. Therefore, an area where the fixed iron core attracts the plunger can be increased, so that an attraction force can be increased.

Abstract: A movable contact arrangement suitable for use in a switching device has a rigid contact body and a flexible conductor piece connecting the contact body to a fixed conductor. The contact body is connected to the conductor piece by mechanically compressing a section of a semifinished product in the form of a cable or strand, with the flexible conductor piece being formed by an uncompressed part of the semifinished product. The compressing operation can also be used at the same time to produce the contact body from the semifinished product. The method described allows low-cost production of contact modules for power circuit breakers used in sophisticated mechanical and electrical equipment.

Abstract: An adjustable magnetic trip unit for a circuit breaker includes a torsion spring which applies a bias force to the plunger of a trip solenoid. The torsion spring is mounted on a driven bevel gear and wound by an adjustment knob coupled to a driving bevel gear to adjust the current at which the solenoid is activated. An indexer having peripheral flats which engage a seat in the circuit breaker housing provides a plurality of discrete positions of the adjustment knob. Depressing the adjustment knob against a second spring unseats the indexer for rotation of the adjustment knob between settings. In addition, a slide with an inclined surface bearing against the plunger and coupled to the driven bevel gear, provides simultaneous adjustment of plunger gap with adjustment of the torsion spring force to increase the range of adjustment.

Abstract: An armature for a switching relay having an armature plate and an armature spring. The armature plate is pivotally mounted on the switching relay between an open and closed position. The armature spring is attached to the switching relay by a suspension and has a spring contact region connected to the armature plate. A first web is attached to the spring contact region, and a tension rod is connected to the first web so that minimal torsional forces are transmitted to the tension rod when the armature plate pivots between the open position and the closed position.

Abstract: A shunt trip assembly having a tripping solenoid and a locking solenoid selectively blocks movement of the tripping solenoid to prevent inappropriate tripping of a circuit breaker during shock loading thereof. The tripping solenoid includes a tripping plunger that is longitudinally translatable along a tripping path to operatively engage a trip button of the circuit breaker. The locking solenoid includes a locking plunger that is selectively translatable along a locking path to selectively block movement of the tripping plunger, the locking path being substantially perpendicular to the tripping path. A longitudinally-facing first abutment surface on the tripping plunger is engaged by the locking plunger to prevent inappropriate movement of the tripping plunger during shock loading. A peripherally-disposed second abutment surface on the tripping plunger prevents misconfiguration of the shunt trip assembly after the shunt trip assembly has been deenergized.