Abstract: Described herein is a low voltage switching device including: one or more electric poles having one or more movable contacts and corresponding fixed contacts adapted to be coupled to or uncoupled from each other; a movable contact assembly including said movable contacts and a main supporting and operating shaft reversibly movable between a first contact position, at which said movable contacts and said fixed contacts are uncoupled, a second contact position, at which said movable contacts and said fixed contacts are coupled, and a third contact position, at which said movable contacts and said fixed contacts are coupled and kept pressed; an operating assembly including a handle mechanism having a handle adapted to be reversibly moved by a user or a motor operated actuator (MOE) between a first, open position and a second, closed position; and a driving assembly operatively connected to said operating assembly.

Abstract: According to an embodiment, when a switchgear operating state is shifted from a close state to a cutoff state, a solenoid lever is pushed and rotated by a plunger of an electromagnetic solenoid for cutoff so that the solenoid lever rotates in a direction opposite from the direction of the urging of a solenoid-lever return spring. A trigger roller pin and the solenoid lever become disengaged from each other, an eccentric pin and a trigger lever are rotated by the urging force from a latch leading end become disengaged from each other, whereby a latch lever is rotated by the released energy of a cutoff spring.

Abstract: A device and method for operating automotive battery system relays and related switches. By aligning a magnetic field with a direction of current flow in a contact plate disposed between magnets that are producing the field, a generated Lorentz force can be used to promote arc extinguishing during a relay opening sequence, while simultaneously reducing the tendency of the Lorentz forces to interfere with the operation of a solenoid or other switch-activating mechanisms. By using a rotary-based mechanism to establish contact between a contact plate and current-carrying terminals, the likelihood of inadvertent opening of the relay is reduced. Such devices and methods may be used in conjunction with hybrid-powered and electric-powered vehicles.

Abstract: A device and method for operating automotive battery system relays and related switches. By aligning a magnetic field with a direction of current flow in a contact plate disposed between magnets that are producing the field, a generated Lorentz force can be used to promote arc extinguishing during a relay opening sequence, while simultaneously reducing the tendency of the Lorentz forces to interfere with the operation of a solenoid or other switch-activating mechanisms. By using a rotary-based mechanism to establish contact between a contact plate and current-carrying terminals, the likelihood of inadvertent opening of the relay is reduced. Such devices and methods may be used in conjunction with hybrid-powered and electric-powered vehicles.

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 electromagnetic contact device has a contactor holder (40), which moves a mounted movable contactor (42a) according to a displacement of a movable core (32) forming an electromagnet (30) for operation. The contactor holder (40) is being housed together with the electromagnet (30) for operation in a case (1). The case (1) has a lower case portion (10) housing the electromagnet (30) for operation and an upper case portion (20) engaging with the lower case portion (10) while being stacked on the lower case portion and houses the contactor holder (40) advanced from above. The upper case portion (20) has a recess (21) with an upward opening and houses the contactor holder (40) placed on the bottom wall of the recess (21). The lower case portion (10) houses one selected either a DC-only electromagnet (30b) or an AC-only electromagnet (30a).

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: A leakage protective plug comprises a case and electric contacts. A protective cap is fixed on the top of the case and includes a reset button protective cap and a test button protective cap. The reset button protective cap is interiorly provided with a reset button connected with a push rod which in order penetrates an electric contact upper panel, an upper spring, an electric contact lower panel and a lower spring. The electric contact upper panel is provided at a right side thereof with a locking member linked with a brake connecting rod which is linked with a brake plate. The brake plate is located at a lower right side of the locking member. Below the brake plate are disposed an electromagnet pole shoe, an electromagnet coil, and an electromagnet core. The test button protective cap is provided with a test button having a test electric contact.

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: 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: An automatic transfer switch includes a solenoid control contacts assembly, an auxiliary contacts assembly, a dual purpose cam attached to a cylindrical shaped weight, and a solenoid actuator. When energized, the solenoid actuator rotates the cylindrical weight and the dual purpose cam actuates both the solenoid control contacts assembly and the auxiliary contacts assembly.

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: A ground fault circuit interrupter device is described.

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 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 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 lockable fastener connects together a plurality of components of a circuit breaker and maintains electrical conductivity between the components while permitting relative movement therebetween. The lockable fastener includes a first clinch nut member and a second clinch bolt member. The clinch nut member includes a threaded cavity formed therein, a side having opening therein, and a passageway between the side at the opening and a surface proximate the threaded cavity. The clinch bolt member includes a threaded shank. At least a portion of the threaded shank is threadably receivable in the threaded cavity of the clinch nut member, in order to axially align the clinch nut and clinch bolt members. The clinch nut and clinch bolt members are adapted to be locked by deformation of the surface of the clinch nut member to prevent loosening of the members.

Abstract: A field configurable contactor is disclosed. The contactor preferably includes a plurality of spaces adapted to receive any number, up to its limit, of contact modules. Each contact module preferably includes a pair of contacts and a spring biased cam follower which opens and closes the contact pair when a cam profile of the contactor moves according to energization or de-energization of the contactor. The contact module can be either “normally open” or “normally closed” depending on its initial placement onto the contactor relative to the cam profile. A latch assembly in the contactor may hold the contactor mechanically during de-energization.

Abstract: The invention relates to a magnetic switch having a yoke which has the shape of a rotationally symmetrical cup on the base of which is arranged a permanent magnet. The flux of the permanent magnet is conducted via a core, which has a radial core flange, to the plate-shaped armature. For the operational air gap effective between the armature and the core and the yoke and the magnetic resistance WA thereof, the following relation applies in relation to the marginal air gap formed between the core flange and the yoke: WA<WR. As a result of the rotational symmetry with a yoke having the shape of a cup, it is possible to generate a high holding force for the armature with a small structural volume.

Abstract: The present invention is for a bi-stable battery switch incorporated preferably for internal use into a remotely switchable storage battery, or, in the alternative, for external use with a battery. A bifurcated contact assembly incorporating dual bus bars is pulse actuated by a solenoid and cam arrangement to engage or disengage across opposing contacts. When engaging the contacts and when associated with high inductive loads, the first bus bar to advance initiates contact and assumes the arcing load, while the second bus bar to advance assumes the current load. When breaking contact and when associated with high inductive loads, the first bus bar to retreat breaks the current load and the second bus bar to retreat breaks the arcing load. Thus, the loads are shared to increase the durability and length of service of the switch.

Abstract: A load-break switch or load disconnecting switch with a spring-type over-center device whose axis actuates a switching means drive, preferably a switching shaft, includes a lever actuated by a magnet, wherein the magnet moves the lever along a path of movement, wherein the lever moved along this path of movement initially causes an uncoupling of the over-center device axis from the switching means drive and during the further travel along the path of movement the lever actuates the switching means drive which results in an "off" position of the load-break switch, and the lever subsequently again effects a coupling between the over-center device axis and the switching means drive.

Abstract: A circuit breaker (10) has a housing (12). A crossbar (114) is pivotally connected to the housing to pivot about an axis (117) between open and closed positions. A load contact arm (110) is pivotally connected to the crossbar (114). The load contact arm (110) is capable of pivoting about the axis (117). A cam mechanism (140) is mechanically coupled to the load contact arm (110). The cam mechanism (140) is slideably mounted within the crossbar (114) for movement between first and second positions. In the first position of the cam mechanism (140), the load contact arm (110) pivots through an angle (.beta.) about the axis, relative to the crossbar (114) between the "touch" and closed positions, and the load contact arm (110) pivots together with the crossbar (114) through an angle (.alpha.) about the axis (117) between the open and "touch" positions. (2) In the second position of the cam mechanism (140), the load contact arm (110) is free to pivot about the axis (117) through the angle .alpha.

Abstract: An electromagnetic drive for a switch, preferably a motor protective circuit-breaker. The electromagnetic drive has a magnetic system, whose movable armature serves to actuate switching contact elements in the switch. The armature is coupled to a transmission lever by a leaf spring. One end the leaf spring is fixedly clamped and the other end of the leaf spring is connected to the transmission lever in such a way that the transmission lever is actuated when the leaf spring flexes and thus the free end of the leaf spring is displaced.

Abstract: The present invention relates to a control and signalling device for a protective switching apparatus of the relay switch type which is provided with power switches (1) and a protection assembly (4) and is capable of detecting faults (overloads or overcurrents) on each current path associated with a switch (1), this device being actuated by a manual control member (51) which can take an operating "run" position corresponding to closed contacts, a "stop" position corresponding to open contacts and a "trip" position corresponding to the position after detection of a fault, characterised by the fact that it comprises a mobile spring loaded cam (52) actuated by a triggering spring (54) and capable of--from the "run" position in which it is locked by an automatic interlock (55) and after the triggering and release of the interlock (55)--of turning the manual control member (51) which then actuates the coil switch (81).

Abstract: A circuit breaker includes a cam assembly which holds the load blade in contact with the line strap during normal operation. The cam assembly includes a cam surface on a cam which can slide along the load blade and a bearing surface on the load blade. In normal operation, the cam is biased on the load blade so that the cam surface engages the bearing surface. The force applied by the cam surface to the bearing surface in normal operation is approximately parallel to the force applied by the load blade to the line strap, thus, the cam surface does not tend to slide along the bearing surface during normal operation. When a high overcurrent fault occurs, blow-open forces exerted between the load blade and the line strap cause the cam to pivot to a position where the cam surface no longer engages the bearing surface, allowing the load blade to swing free of the cam and break the contact between the load blade and the line strap.

Abstract: An electric switch (1) includes a switching device (4), movable between its ON position and OFF position, for switching a current circuit. The switch (1) is combined with a magnetic circuit (28, 29) for electromagnetic undervoltage tripping. In the event of undervoltage, the magnetic circuit (28, 29), as it opens, shifts the switching device (4) to its OFF position. The switching device (4) shifted to its OFF position closes the magnetic circuit (28, 29) again. A linearly movable fixing slide (24) couples the switching device (4) with the magnet armature (28) of the magnetic circuit and fixes the magnet armature (28) on the magnet core (29) in the OFF position of the switching device (4).

Abstract: A sealed electric switch assembly comprises a magnetic control assembly having first and second magnetic members which is mounted to a top wall of a sealed casing, and an elongated plate having third and fourth magnetic members which is mounted oppositely to the first and second magnetic members so that the elongated plate member can be attracted and repulsed magnetically by the magnetic control assembly. A linkage mechanism is mounted adjacent to the elongated plate member for moving a movable contact of a movable arm to connect and disconnect with a stationary contact. A rotary assembly and a tripping assembly are mounted above the linkage mechanism and over an electromagnet.

Abstract: A low-voltage power switch with a relative auxiliary switch which is actuated as a signalling switch only when the generally multi-pole low-voltage power switch is triggered. The problem to be solved is that of controlling relative auxiliary switches simply and independently of the switch latch. To this end, the switch latch is designed in such a way that the included angle of the moveable contacts or the switching sprindle (18) is greater in the "triggered" than in the "off" state. A radial extension (60) is arranged on the switching spindle (18) in such a way that, in the "triggered" state, it engages a fixed pivoted lever (68) which itself is effectively connected to the prestressed actuating pushrod (66) of the relative auxiliary switch (56).

Abstract: An auxiliary reverser switch for a vehicle which includes a housing mounted in the vehicle in proximity to the operator and having a lever for selecting FORWARD, NEUTRAL and REVERSE positions for vehicle movement. The reverser switch is in addition to a standard range controller having a PARK and other positions and overrides control by the range controller only when a solenoid electrically connected in series with the ignition switch, the range controller, and the reverser switch is energized. The lever is mechanically connected to a rotor which breaks and establishes electrical contact to determine the direction of vehicle travel. The switch is self-canceling in that the lever is automatically returned to a HOME position displaced from the NEUTRAL position upon movement of the range controller to the PARK position or turning off the ignition switch.

Abstract: Linear control apparatus for a circuit-breaker, the apparatus including a slidably-mounted tubular arm actuated by a solenoid, and a "disengagement" first slide which presses against the tubular arm, the first slide being subjected to a first spring assembly. The control end of the drive rod is coupled to the tubular arm via at least one projecting portion passing through a respective longitudinal slot provided along the tubular arm. The control apparatus includes an "engagement" second slide to which the drive rod is fixed via its projecting portion, the engagement second slide being subjected to an "engagement" second spring assembly which displaces it from the circuit-breaker disengaged position to the circuit-breaker engaged position under the action of second control means.

Abstract: A current limiting circuit breaker including a novel spring arrangement between the contact arms of the circuit breaker and the crossbar. The spring arrangement includes a single spring which holds the cam follower attached to each associated contact arm in contact with cam surfaces of the crossbar. The longitudinal axis of the spring is located within a plane passing through the longitudinal axis of the contact arm, wherein the plane is also perpendicular to the rotational axis of the contact arm. The cam surfaces and spring are configured to permit the contact arm to blow open under unacceptable fault conditions even though the crossbar remains stationary.

Abstract: A protective switching device with difference-current, undervoltage and free tripping in a confined space, for example within a conventional mains angle plug or the like, the switch-on and plunger-type magnet mechanics and the electronic monitoring arrangement are divided per se in constructional groups capable of being assembled efficiently.

Abstract: A tagging relay is designed to provide for remote, central control of electrical distribution lines and their respective breaker coils, such control formerly being manually effected only. The relay has a switch shaft construction rotatable from a first, "closed" position to a second, "open" position, from the second position to a third, "tagged" position, from the third to the second position, or from the second to the first position. The rotation can be effected manually via a handle, or remotely via electrical input to one or more solenoids. The relay is designed and constructed such that actuation of any one solenoid may effect rotation of the switch shaft construction to one of the three positions, exclusively. The switch shaft construction is operably linked to a contact-carrying rotary switch shaft provided within a conventional, stationary contact-carrying switch body.

Abstract: An operating for a circuit breaker including a pivoting handle for controlling opening and closing of the circuit breaker and resetting of the latch after tripping. The handle bears a resetting roller which cooperates with a cam surface of the latch, which surface has a first cam section and a second cam section separated by a slope change point. The second section corresponds to the reset position and the slope of this section is chosen in such a way as to obtain a stable reset position of the handle.

Abstract: An automatic cancelling device for electric-type blinkers comprises: a case; a blinker operation lever pivotably connected to the case about an axis; an engagement rod slidably disposed on the blinker operation lever and biased in a direction away from the axis by a compression spring; a lane-change cam rigidly connected to the case and positioned to contact the engagement rod, the lane-change cam having an stepped portion for creating a clicking feeling at a right and a left position to which the blinker operation lever swings; a locking protrusion provided on the blinker operation lever; a locking member adapted to engage the locking protrusion so as to lock the blinker operation lever at its right or left position and capable of moving toward and away from the locking protrusion; and a locking-member driving member which moves the locking member so as to effect engagement and disengagement between the locking member and the locking protrusion.

Abstract: A two-link, trip-free operating mechanism assembly for a switch includes a first pivotally-mounted link comprising a switch lever arm. One end of the switch lever arm is coupled to the switch and a second end of the switch lever arm has a roller mounted thereto. A second link assembly includes a pivotable support member to which a cam member is mounted for rotation. The pivotable support member is selectively fixed during the closing of the contacts, or movable between a contact-closed position and an overriding open position. The cam member controls the state of the switch. In the tripped condition, the cam member and the roller are disengaged and the switch assumes a tripped, or open, state. A first spring arrangement applies a force to the link arrangement to cause the links to close from an open position. For trip-free operation, a second set of springs forces the switch arm link to immediately move to a switch-open position.

Abstract: A relay includes a movable element having first and second portions separated from each other. The first portion can be moved between a first stable position corresponding to a state where contacts are closed and a second stable position corresponding to a state where the contacts are opened while abutting against resilient plates. The second portion can push the first portion so that the first portion is moved from the second stable position to the first stable position by application of external force. The second portion is always urged to go away from the first portion by a spring. The first and second portions are disposed to be separated from each other by a distance corresponding to a stroke of the first portion when the first portion is positioned at the first stable position. The first portion of the movable element is moved from the first stable position to the second stable position by a magnetic force of a solenoid coil when sensor terminals are electrically connected to each other.

Abstract: A circuit breaker embodies with a single electromagnetically actuated plunger two levels of actuation, corresponding to two levels of excessive current or voltage defined by two different airgaps, one at the lower level for triggering the toggle mechanism, the other at the higher level for directly actuating the movable arm through a kicker arm. The preferred embodiment provides a double-ended lever pulled by the plunger at midpoint for actuating the trip bar, and the kicker arm is actuated in an overriding situation by the lever rotating about the trip bar blocked at the end of its initial move.

Abstract: An operating mechanism assembly used within molded case circuit breakers employing electronic trip units interconnects the operating mechanism with the circuit breaker movable contact arms by means of a slotted-cam arrangement. The slotted-cam optimizes the manual closing of the movable contact arms by controllably over-centering the circuit breaker operating mechanism springs.

Abstract: An automatic cancelling device for a winker is disclosed, in which a locking removing member can efficiently transmit a stroke of a working member of a solenoid when returning a holder to neutral position. Construction of the locking removing member includes an engaging portion that engages with the working member of the solenoid, a first fulcrum portion on one side of the locking removing member which is brought into contact with the holder, and a second fulcrum portion on the other side of the locking removing member which is brought into contact with a supporting portion located on the lower case. Further, engaging protruding portions, disposed on one side of the holder, slide upon cam portions disposed on the locking removing member on either side of the engaging portions. Hence, by using the construction above, the locking removing member is rotated around one of the fulcrum portions without rotation of the working member of the solenoid.

Abstract: An automatic canceling device for a winker system of an automobile that can effectively reduce the size of the solenoid incorporated and hence the overall size as well as the manufacturing cost of the device is provided. Such an automatic canceling device comprises a case, a winker operating lever pivotably fitted to the case, an expandable engaging section connected to the lever by way of a compression spring, a locking cam unit provided within the case and engaged with the engaging section to hold the lever in a neutral, left or right position, a releasing member provided in abutment with a cam provided on the lever to return the lever to its unlocked position and a solenoid to be energized by a release signal to activate the releasing member.

Abstract: An apparatus for electrically operating a circuit breaker comprising an electrically powered pawl which is driven by an electric motor for causing a ratchet to rotate and a release mechanism for causing the electrically powered pawl to move out of driven engagement with the ratchet when the ratchet rotates to a predetermined angle. A guide bar on which a spring is mounted is secured on a main frame. A slider is slidably provided on the guide bar. The slider engages with a handle of the circuit breaker and throws the circuit breaker when it slides on the guide bar. The slider is driven into sliding motion by a cam which rotates with the ratchet gear in a unitary motion and the slider compresses the spring on the guide bar. When the slider reaches up a position where the circuit breaker is turned off, the release mechanism causes the electrically powered pawl to move out of driven engagement with the ratchet.

Abstract: A circuit breaker consisting of a housing having a fixed contact and a movable contact mounted on a blade which in turn is pivotally supported on a blade carrier that is pivoted within the housing and a handle that cooperates with the blade carrier to pivot the carrier between positions. A trip lever is pivotally mounted in the housing and has biasing means interposed between the blade and the trip lever to pivot the blade between respective positions with latch means holding the trip lever in a position where the blade and blade carrier are biased to close the contacts. The handle and carrier have cooperating camming surfaces that magnify the forces applied to the handle for pivotal movement of the carrier.

Abstract: A cam roll pin assembly includes a cylindrical portion having an extending axle at each end for receiving a small roller and a relatively larger roller. The smaller roller is provided for engaging the cam surface on the contact assembly. The larger roller is received within a slot. Retaining rings are used to secure rollers on the axles. With such an arrangement the rollers are able to rotate independently. Thus, during a blow open condition, the contact points of the cam roll pin assembly can rotate in opposite directions without causing relatively large frictional forces on the cam roll pin which can slow down the blow open speed.

Abstract: A circuit breaker of a current-limiting type, which is able to open quickly by using a magnetic repulsive force generated when currents of opposite direction flow through a fixed contactor and a movable contactor which are arranged in parallel to each other. The movable contactor opens or rotates around a supporting shaft. Then, a guide pin, secured at the base portion of the movable contactor, slides into a guiding longish opening and passes over a turning point formed in the longish opening. As a result, the line of action of a compressed spring force changes its direction in order to push up the movable contactor to the full open position.

Abstract: A multi-pole circuit interrupter having a first pole unit provided with an operating mechanism and a second pole unit provided with no operating mechanism. Each of the pole units comprises a movable contact, a stationary contact, and a contact arm assembly for supporting the movable contact of the respective pole unit including a first contact arm and a second contact arm pivotally supported by a common pin. The first contact arm in the first pole unit have an elongated guide hole extending in a direction of movement of the movable contact and is directly connected to the operating mechanism. The second contact arm has an elongated hole extending substantially in a longitudinal direction thereof. A spring-biased sliding pin extends through the elongated hole and the guide hole.

Abstract: A circuit interrupter comprises a contact arm assembly for supporting the movable contact composed of a first contact arm and a second contact arm pivotally supported by a common pin, the first contact arm having an elongated guide hole extending in the direction of movement of the movable contact, the second contact arm having an elongated hole extending substantially in the direction of extension of the second contact arm. A second pin extends through the elongated hole and the guide hole, and a spring is provided for biasing the second pin. The elongated hole has a pin sliding surface on which the second pin slides and which forms an angle of 90.degree. or more with respect to a pin sliding surface of the elongated pin guide hole when the first contact arm is being reset after the second contact arm is separated by an electromagnetic repulsive force.

Abstract: A circuit breaker operating mechanism for automated assembly finds application within circuit breakers of different ampere ratings. The circuit breaker contacts are opened and closed by means of a roller connected to the circuit breaker operating handle through a cradle link and a cam arranged on the movable contact carrier. The operating springs, cradle and latch are first assembled to the operating mechanism prior to assembly of the operating mechanism within the breaker housing.