Abstract: A push-button structure includes: a mounting body, an outer surface of the mounting body being at least partially recessed inward to form a blind hole; a first magnetic component, located in the blind hole; a second magnetic component, located on an inner surface of the mounting body and distributed symmetrically with the first magnetic component on an opposite side of the mounting body, for generating, based on a distance to the first magnetic component, a magnetic signal corresponding to the distance; and an elastic block, located in the blind hole and having a first form without an external action and a second form under an external action.

Abstract: Disclosed is an electronic contactor including: a lower body; a magnetic force generator disposed within the lower body and magnetized by electric power transferred from outside to perform suctioning operation; a crossbar coupled to an upper portion of the magnetic force generator and provided with a movable contact to be lifted or lowered; a pair of separable upper bodies each being provided at one side thereof with a stationary contact and an auxiliary stationary contact and respectively coupled to upper opposite ends of the lower body such that the movable contact and auxiliary movable contacts are placed therein, facing ends of the upper bodies being coupled to each other inside the upper bodies so as to face each other; and a cover coupling upper ends of the upper bodies such that an upper end of the crossbar and the movable contact are exposed.

Abstract: An electromagnetic relay has a fixed touch piece having a fixed contact, a movable touch piece having a movable contact contactably and separably opposed to the fixed contact, and configured to elastically deform, an auxiliary member configured to energize the movable touch piece to the fixed contact piece side, an electromagnet, and an intermediate member configured to be operated by magnetization of the electromagnet and elastically deform the movable touch piece.

Abstract: Provided is a contact device in which all of three movable contacts can be securely brought into contact with fixed contacts. The contact device includes a fixed terminal 37 that has a fixed contact 35, a movable terminal 28 that moves toward and away from the fixed terminal 37 and has three movable contacts 31a, 31b, and 31c that are brought into contact with the fixed contact 35, and a pressing spring 33 that presses the movable terminal 28 and brings the movable contacts 31a, 31b, and 31c into contact with the fixed contacts 35 at a predetermined pressing force. The point of application of the pressing spring 33 is located in a triangle formed by internal tangents of the three movable contacts.

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: 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: At least one electrical contactor is provided that includes a fixed contact and a movable contact. The fixed contact includes a center leg and first and second arms that extend in opposite directions from the center leg. The movable contact associated with each fixed contact includes first and second blades positioned on opposite sides of the center leg. The first and second blades extend parallel to the center leg of the fixed contact such that when current flows through the electrical contactor, the current flow creates a force to push the first and second blades into the first and second arms of the fixed contact. The electrical contactor includes an actuating arrangement having a pair of cam members. The movement of the cam members causes pegs on each of the first and second blades to travel within the cam channel, thus opening and closing the contactor arrangement.

Abstract: A switch device that adjusts tactile sensation of a switch knob without control delay. The switch device includes a knob operated to switch an actuation state of an apparatus. A click mechanism is connected to the knob and includes a recess and a projection. Engagement of the projection and the recess provides a tactile sensation to a person operating the knob when the knob is operated. An adjustment mechanism generates a magnetic field to adjust tactile sensation of the click mechanism.

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 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: Disclosed are a multi-pole circuit breaker and an apparatus for preventing deformation of a driving shaft thereof. The multi-pole circuit breaker includes: a plurality of single pole breaking units having a pair of fixed contactors, a movable contactor, and shafts; a switching mechanism disposed on a certain one of the plurality of single pole breaking units; a pair of driving shafts connected to each shaft; and a driving shaft deformation prevention unit disposed between the single pole breaking unit, spaced relatively far from the switching unit among the plurality of single pole breaking units, and the adjacent single pole breaking unit.

Abstract: Disclosed is a multi-pole circuit breaker. The multi-pole circuit breaker includes: a substrate disposed between the single pole breaking unit, spaced relatively far from the switching mechanism as compared to the other single pole breaking units among the plurality of single breaking units, and the adjacent single pole breaking unit; a link mechanism rotatably supported on the substrate; and springs having one ends supported by the substrate and the other ends supported by the link mechanism.

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: A making operation preventing device 130 has a releasing trigger 19 for retaining, via a releasing latch 18, a breaking lever 36 to which a torque in a counterclockwise direction is applied by an opening torsion bar 34; a releasing electromagnet 20 for opening an on-off contact 10 by releasing the engagement between the releasing trigger 19 and the releasing latch 18 to rotate the breaking lever 36 in a counterclockwise direction; a cam 3 rotated as one body with a gear 40 connected via a link 41 to a making lever 37 to which a torque in a counterclockwise direction is applied by a closing torsion bar 35; a making trigger 15 which retains a second pin 13 attached to the cam 3 via a making latch 14 and maintains the closing torsion bar 35 in a prestressing state; a releasing electromagnet 16 for driving a trigger lever 16d in a right direction to release the engagement between the making latch 14 and the making trigger 15, and an interlocking electromagnet for rotating the trigger lever 16d in a counterclockwi

Abstract: An electromagnetic switchgear unit has an electromagnetic drive appliance which acts as an auxiliary magnet system and by means of which the contact force is first increased on the occurrence of a short-circuit current, before the contacts are abruptly torn apart. For this purpose, the drive appliance actuates a lever rotatably supported on the contact bridge carrier, which lever displaces the contact bridge carrier and, by this means, compresses a contact compression spring and a further compression spring.

Abstract: An electrical switching device prevents moving contacts from welding to stationary contacts in a switching device. This is achieved using an auxiliary magnet system in the main current path, which system produces a contact pressure force corresponding to the excitation current so that no arcs are produce between the contacts when overcurrents and short-circuit currents occur. The moving iron core of the auxiliary magnet system is for this purpose connected to the contact link mounting via which the contacts are switched on and off.

Abstract: An electromagnetic contactor or motor controller is taught in which an energy efficient bounceless contact closing operation is utilized. An electromagnetic closing coil voltage is sensed by the contactor control system and compared against a memory menu of stored delay angles for a wide range of sensed voltages. The delay angles are applied to the conduction interval of a triac or similar gated device which is connected in series with the coil for controlling current flow therethrough. Depending upon the voltage sensed the amount of current flowing through the coil on a half cycle by half cycle basis is varied by the control system.

Abstract: An energy accumulator for a circuit breaker comprises a cross piece which can be inserted between side walls of the support mechanism of the circuit breaker, which has a substantially U-shaped cross section and against the center part of which coil compression springs are braced. With their opposite ends, the springs rest against a movable abutment which likewise has a U-shaped cross section. A push rod which goes through one of the springs in its longitudinal direction is guided in the cross piece and has a transverse hole for inserting a securing pin in the partially cocked state of the springs. Between the legs of the cross piece there are inserts which have an extension pointing in the direction of the movable abutment. Thereby, a space for the engagement of a leg of the movable abutment is formed if the springs are tensioned more heavily.

Abstract: An electromagnetic contactor is taught having an E-shaped movable magnetic armature and a complementary E-shaped permanent magnet. The outboard legs of the E-shaped members abut at closure. Each of the central legs of the complementary magnetic members have significant magnetic material removed from the face thereof leaving complementary abutting nipples or protrusions which mate or make with each other as the outer legs make or mate with each other. The total reluctance of the magnetic system when in the abutted state is significantly lower than if the air-gap material had not been removed. This allows the kickout spring to operate effectively to separate the magnets at an appropriate time. The lower the magnetic reluctance the higher the residual magnetism and the more difficult it is for the kickout spring to separate the magnetic members and thus the contacts of the contactor during an opening operation.

Abstract: The pivot shaft which couples the contact arm to the side support plates of a molded-case type circuit breaker is provided with a pair of spacer members that hold the contact arm in precise centered position relative to the support plates and prevent the contact arm from shifting laterally along the pivot shaft during trip and reset operations of the circuit breaker. The movable contact thus swings along a fixed predetermined arcuate path when the circuit breaker is tripped and subsequently reset. The toggle assembly is also simplified and reduced in size and cost by employing a single, upper toggle link and pivot shafts that are each anchored in place by an integrally-formed shoulder at one end and a force-fitted lock washer at the other end.

Abstract: An electric circuit breaker with blow open contact arm characterized by a pair of separable contacts one of which is mounted on a contact arm that is rotatably mounted on mounting bracket. The contacts maintain a repulsion magnetic force which operates to separate the contacts when a predetermined current overload occurs. A trip mechanism is connected to the mounting bracket or automatic opening of the contacts in response to a predetermined current overload condition. The contact arm comprising a cam and the mounting bracket comprising a cooperable cam follower whereby the contact arm is movable to an open contact independently of the mounting bracket.

Abstract: Individual movable contactors of a circuit breaker are made up of a pair of conductors. The first conductor has one end bifurcated to form a pair of legs separated by a slit. At the open end each leg has a curved inner portion the opposed curved portions of the two legs defining a receptor space which is substantially circular in cross section. The second conductor has one end whose cross section is substantially circular and which fits within the receptor space and makes a good slidable contact therewith, and the other end which supports the main contact. Provision is made for rotating the second conductor about its circular end for opening or closing connection to the main contact.

Abstract: A movable contact arm assembly is provided for a circuit breaker. The contact assembly includes a carrier which has first and second guide plates with aligned roller guides and bracket supports and a roller which has a middle portion extending between the guide plates and the end portions and engaging the roller guides. A bracket extends between the guide plates and engages the bracket supports. A spring is positioned between the bracket and roller which urges the roller along the roller guide. The contact arm has first and second cam surfaces and is positioned between the guide plates and pivotally connected thereto. The roller rides in the guide on the first and second cam surfaces and the roller moves from the first cam surface to the second cam surface as the contact arm moves from a closed position to an open position in response to preselected electromagnetic repulsion forces.

Abstract: An electric circuit breaker having fast short circuit response along with reduced arc energy is provided by means of a current limiting contact arm arrangement. The contact arm is arranged to pivot independently of the circuit breaker operating mechanism under the influence of magnetic repulsion forces. A contact spring configuration controls the rate at which the contacts separate, thereby limiting the energy of the arc created upon contact separation.

Abstract: A movable contact arm for circuit breakers allows the contact opening characteristics to be determined over an entire range of breaker ratings. The contact arm is provided with a camming surface with the contact closure spring arranged as a cam follower. Under short circuit conditions, the contact repulsion force is sufficient to overcome the bias provided by the contact closure spring and to drive the cam follower along the camming surface so that the resulting spring torque rapidly changes from a high initial torque on the contact arm to zero torque in a very short period of time. The contact arm is linked with the contact operating mechanism to open upon current overload in response to the trip mechanism.

Abstract: A magnetically actuated proximity switch is provided with a double-pole double-throw contact arrangement. To substantially equalize the contact pressures between the two poles a movable armature, to which the movable contacts are firmly attached, is loosely pivoted to rotate about a transverse axis to open or close the contacts and to rock about a longitudinal axis to divide the available operating force between the two poles of the switch.

Abstract: A polarized electromagnetic relay includes two contact springs extending substantially parallel to each other.One of the contact springs forms a movable contact for cooperation with a fixed contact. In the contacting condition, the free ends of the contact springs touch each other. A first actuator portion of a relay armature serves to move the contact springs into the contacting position, and a second actuator portion serves to move the contact springs in the opposite direction to open the contact. The ratio of the spring lengths between the second actuator portion and the movable contact, divided by the thickness of this length of contact spring is smaller than the ratio of the spring lengths between the first actuator portion and the touching location of the two contact springs, divided by the thickness of this length of contact spring.

Abstract: A current limiting circuit breaker includes two parallel pivoting contact arms carrying contacts at the ends thereof. The upper arm is double pivoted and is operated by a mechanism between open and closed positions. A magnetic drive slot motor device surrounds the lower arm and operates during extreme overcurrent conditions to draw the lower arm down and aid in rapidly separating the contacts. An arm positioning assembly is spring loaded to bias the lower arm toward a closed circuit position and provide contact closing force, the upper limit of travel being set by a rod extending through the end of the lower contact arm to abut against the slot motor.

Abstract: A high sensitivity electromagnetic relay has a moving armature held against two pole pieces of a magnetic circuit by means of a permanent magnet. The armature is subject to the action of two return springs which tend to draw the armature off the pole pieces. A first, non-adjustable spring provides the main antagonistic torque while an adjustable spring which is a separate component part from the main spring is used for fine adjustment of the force acting against the permanent magnet. The amount of current flowing through a coil which is required to trip the relay can then be adjusted finely.

Abstract: A high performance, manually and automatically operable, trip-free magnetic circuit breaker incorporates compact, readily accessible calibration means in which the direction of application of a substantially constant spring force is varied to permit convenient, high resolution calibration of the breaker.

Abstract: A DC contactor providing increased magnetic efficiency, reduced contact bounce, and shorter arc time has a movable contact carrier bar pivotally mounted relative to a clapper armature so as to prevent tilting about its longitudinal axis and eliminate rotational bounce; a pre-loaded contact pressure spring which resiliently urges the contact carrier bar against the armature; an armature retainer spring which resiliently urges the pivoted end of the armature backward and downward against the yoke so as to displace dirt accumulated in the pivot area and prevent jamming of the armature; a generally hyperbolic magnetic pull characteristic with the knee at approximately the one-half armature travel position and the magnetic pull at the two-thirds armature travel position being approximately twice the magnetic pull at the knee to thus provide relatively high magnetic pull per ampere in the region above the knee; the magnet gap between armature and core at the point of contact engagement being less than that at the k

Abstract: A double pole double throw relay has two flexible electrically conductive contact arms which each carry an electrical contact positioned to engage cooperating contacts. Contact closing pressure is simultaneously applied to both contact arms by a yoke made of electrical insulating material which extends transversely of the arms and is pivotally connected midway of its length to an actuator which is positioned between the contact arms and is movable toward and away from the arms. The pivotal mounting of the yoke tends to equalize the contact closing pressure. In one embodiment, the yoke is supported by yielding means to provide a degree of overtravel which maintains pressure and compensates for contact erosion and water.

Abstract: An improved calibration mechanism is provided for use on a pressure switch having an adjustable, spring biased plunger arrangement for controlling the pressure level required to actuate the switch. The mechanism includes a support bracket, a cam rotatably supported by the bracket and a plunger adjustment lever, including a cam follower in engagement with a surface of the cam. The support bracket defines a guide slot into which the cam follower extends, transverse movement of the cam follower being limited by the guide slot. The cam surface defines a range of pressure settings between the normal low and the normal high as well as a switch reset position adjacent the normal high setting position. The guide slot includes a stop surface which engages the cam follower when the cam is turned to the reset position, and the configuration of the cam, plus the engagement of the follower and the stop surface, prevents further turning of the cam.

Abstract: A circuit interrupter particularly suitable for use in an oil filled distribution transformer having an elongated contact arm pivotable about one end with a movable contact attached to the other end through suitable insulating members to electrically isolate the movable contact from the elongated contact arm. The movable contact is a bridging contact for completing a series circuit through two stationary contacts. The movable bridging contact is spring biased away from the elongated contact arm. A retainer restricts the movement of the bridging contact away from the insulating members attached to the elongated contact arm. The biasing spring is disposed between the insulating members and the retainer. Grooves formed in the sides of the insulating members restrict rotational movement of the retainer and bridging contact. For larger circuit interrupters, a bridging contact assembly can be utilized having a plurality of parallel bridging contacts and a plurality of biasing springs.