Abstract: A switching apparatus is disclosed. The apparatus comprises an electrical contactor including a set of main terminals per phase and an auxiliary switch including a set of auxiliary terminals per phase. Each set of the auxiliary terminals is electrically connected to a respective set of the main terminals via a resistance wire, such that each set of the auxiliary terminals is electrically connected in parallel with each respective set of the main terminals. Each resistance wire includes a first terminal at a first end configured to connect to one of the set of auxiliary terminals, and a second terminal at a second end configured to connect to a respective one of the set of main terminals. The second terminal of the resistance wire comprises a retention hook configured to hook onto the respective main terminal.

Abstract: An electromagnetic switch is provided, which includes a solenoid, a housing member and a sealing member. The solenoid includes an electromagnetic coil which produces an electromagnetic force upon supply of current thereto and a case accommodating the solenoid. The housing member accommodates a pair of contacts of the switch, and is caulked and secured to the case through the sealing member. The sealing member has elasticity and prevents wobbling motions of the electromagnetic coil by the elasticity.

Abstract: Multipole circuit breaker comprising single-pole breaking units in the form of cases with two large side faces and having at least one movable contact which operates in conjunction with at least one stationary contact, an operating mechanism common to a set of breaking units to command opening or closing of the contacts of said units, first line-side electrical connection means, second load-side electrical connection means; the breaking units are grouped on two superposed layers, at least one layer comprising at least one pair of units, the operating mechanism comprising mechanical connecting means to simultaneously actuate the single-pole breaking units of each layer.

Abstract: A high voltage relay comprises a hermitically sealed housing made of ethylene vinyl alcohol (EVOH) and having internal components for changing the state of said relay. Terminals are electrically connected to the internal components for connection to external circuitry and applying an electrical signal to control the state of the relay. A nitrogen and sulfur hexafluoride gas fills the housing to allow for reliable high voltage operation with the housing having low permeability to the molecules of the gas.

Abstract: An auxiliary switch terminal housing is provided for a telecommunication system circuit breaker including an enclosure, separable contacts inside the enclosure, line and load terminals in electrical communication with the separable contacts, an operating mechanism for opening and closing the separable contacts, and an auxiliary switch which is actuated by the operating mechanism. The auxiliary switch includes outputs and conductors electrically interconnected with the outputs. The terminal housing includes a first portion coupled to the enclosure of the circuit breaker proximate the line and load terminals, a second portion distal from the first portion, a plurality of terminals inside the second portion and electrically interconnected with the conductors and the outputs of the auxiliary switch, and a fastening mechanism, such as a pair of screws or rivets, fastening the terminal housing to the circuit breaker enclosure. An electrical switching apparatus employing a terminal housing is also disclosed.

Abstract: Certain exemplary embodiments can provide a system that can comprise one or more brackets adapted to be coupled to a panel. The bracket can define a collar adapted to slideably couple the panel to a pole. The bracket can be adapted to restrain rotational motion of the panel about a longitudinal axis of the pole.

Abstract: An arrangement used to fix conductor rails for multi-phase switchgears to allow for mounting and dismantling the conductor rails in a simple manner is provided. The switchgear housing (4) comprises straight guide elements (16) which are used to receive the mounting position using the conductor rails (8). Each conductor rail (8) includes a continuous bore (22) which is covered by a receiving bore (24) when in a mounted position, the receiving bore being formed in the switchgear housing (4). Insertion journals (28) extend through the continuous bores (22) into the receiving bores (24) associated therewith and are combined with a connecting web (30) in order to form an insertion comb (26) made of an insulating material.

Abstract: An improved circuit breaker for electric panelboards is configured to facilitate replacement of an existing circuit breaker when its buss bar mount is damaged due to circuit overload or other fault conditions. The improved circuit breaker has an extension section that extends the breaker housing to a buss bar connector on a distally positioned buss bar and an electrical connector in the extension section that engages the distal bar connector thereon. The improved circuit breaker is provided with a cavity on the bottom side thereof that is sized and configured to substantially straddle the damaged buss bar connector on the proximally positioned buss bar, to which the replaced circuit breaker was originally connected. In an alternative embodiment, preferably configured for twin or quad circuit breakers, a second electrical connector is provided in the cavity to engage a non-damaged proximal bar connector to better divide the electrical draw between buss bars.

Abstract: An electromagnetic relay including a base, an electromagnet fitted to the base, and a contact section operable to open or close with an operation of the electromagnet. The base includes a retaining face firstly contacting with the yoke of the electromagnet, in an action of fitting the electromagnet to the base, and retaining the electromagnet at a predetermined height on the base as seen in a direction of the coil center axis of the electromagnet. The base also includes a guide face slidably engaged with the yoke, by shifting the yoke along the retaining face, and guiding the electromagnet in a fitting direction intersecting with the coil center axis. The retaining face and the guide face cooperate with each other to fixedly support the electromagnet at a predetermined fitting position on the base.

Abstract: A circuit breaker includes a molded base and cover, with at least one of the base and cover being a molded member including a pair of end walls, a pair of side walls, and an opening between the side walls. A strengthening member engages the base and cover between the side walls at the opening, engages at least one of the side walls and is an interior wall of the molded member. The base and cover are made of a first material, such as glass polyester or a suitably high strength plastic, and the strengthening member is made of a second dissimilar material, such as aluminum or steel, which has greater strength than the first material. An operating mechanism coupled to separable contacts is structured to move the contacts between open and closed positions. A trip mechanism coupled to the operating mechanism is structured to actuate the operating mechanism.

Abstract: The invention relates to a electromechanical switching device having two movable contact elements interacting with a fixed contact. Said switching device has a housing. When viewing a fixing side from the top, said housing is divided into two areas bordering with a longitudinal side of the housing, one of the movable contact elements and the corresponding fixed contact being located in said areas, wherein each of the housing areas has a narrow partial area and a broad partial area bordering therewith. The broad partial area of the first housing area is adjacent to the narrow partial area of the second housing area and the narrow partial area of the first housing area is adjacent to the broad partial area of the second housing area. The actuation directions of the movable contact elements are directed opposite each other.

Abstract: An auxiliary contact unit for a magnetic contactor is discloses, wherein the auxiliary contact unit is disposed at an inner lower frame thereof with a cover connected to lower hooks and supporting an upper structure, and the cover is supported at a lower surface thereof by a protrusion.

Abstract: A terminal assembly for use in a circuit breaker. The terminal assembly includes a first member and a second member abutting the first member. The second member includes a pair of protruding arms to be inserted into a corresponding pair of recesses in a circuit breaker housing. Because the pair of protruding arms are inserted into the housing, the first member is protected against rotational force.

Abstract: A moving arm for a moving contact assembly in a telecommunication system circuit breaker is provided. The circuit breaker has a housing assembly, an operating mechanism, a trip device, and a current path assembly. The current path assembly includes a line conductor assembly having a fixed contact. The operating mechanism is structured to move between an on position, a tripped position, an off position and a reset position. The moving arm assembly also includes a movable contact structured to be disposed on the moving arm. The moving arm has an elongated body with an offset disposed at one end. The offset is structured to displace the movable contact relative to the longitudinal axis of the moving arm body.

Abstract: A medium voltage vacuum contactor comprising for each pole, a vacuum envelope which contains a fixed contact and a corresponding movable contact; and actuating means providing the energy required to move the movable contacts, characterized in that said actuating means comprise an electromagnetic actuator having: a magnetic yoke which has an inner cavity communicating with the outside through at least a first opening; at least one coil accommodated in the cavity; a movable armature which is operatively connected to at least one movable contact through coupling means, and is mounted axially displaceable in the cavity with at least one end protruding from the first opening; at least one permanent magnet devoted to directly hold the movable armature in two stable positions. Further, there are provided means for guiding the movement of the movable armature which are positioned outside the yoke in correspondence of at least the first opening.

Abstract: A shouldered connector pin socket (14) is shown having an open channel (14a) formed in the face surface of a wall member of a circuit breaker housing. An electrically conductive spring member (16, 16?) is received over the channel and is formed with a first set of spring fingers (16d) that are adapted to engage a connector pin along a first axial length (14c) of the channel making electrical engagement with the pin and urging the pin against the channel surface as the pin is slidingly inserted into the channel. The spring fingers urge the flange of the connector pin into a recess formed by a stepped shoulder defining the entrance to a second axial length (14d) with the stepped shoulder and the spring fingers cooperating to retain the connector pin in the channel. A second set of spring contact fingers (16e) can also be used to engage the connector pin along a third axial length (14e) and thereby provide a redundant contact system.

Abstract: A handle assembly is provided for a circuit breaker which includes a housing assembly that defines a substantially enclosed space housing an operating mechanism. The handle assembly is preferably a single-piece and includes a base member which is coupled to the operating mechanism, and a handle member having a first end which protrudes from an opening of the housing assembly, and a second end coupled to the base member. The base member includes first and second integral resilient legs which are disposed within the opening and are supported by posts protruding from the housing assembly, in order to resist undesired access into the substantially enclosed space therein. The first and second integral resilient legs each include a groove which increases the resiliency of the leg. The handle assembly is preferably symmetric about the longitudinal axis of the handle member.

Abstract: An improved filter assembly for a circuit breaker includes a generally rectilinear filter housing having at least two filter mounting zones for receiving at least two filter assemblies, so as to define, in the aggregate, a filter assembly, and at least two filter assemblies configured for interfitting with the filter mounting zones of the filter housing, each filter assembly comprising a generally rectilinear filter body having a given peripheral configuration and a filter gasket configured for interfitting about a periphery of the filter body for sealingly engaging the filter body relative to the filter housing in response to forces encountered by the filter assembly both upon assembly and in operation. The filter assembly may further have a small hole diffuser having a peripheral configuration similar to the peripheral configuration of the filter bodies, in the aggregate, when assembled with the filter housing and configured for interfitting within the filter housing.

Abstract: A bus assembly that is structured to be coupled to a multiple pole circuit breaker and to a plurality of horizontally aligned vertical line conductors is disclosed. The circuit breaker has a back side with a line terminal and a load terminal for each pole extending therefrom. At least two terminals are associated with different poles are vertically aligned. The bus assembly includes a first set of line buses structured to be coupled to the line terminals, and include at least one line bus having a horizontal offset, as well as a second set of load buses structured to be coupled to the load terminals and extending in a direction generally parallel to the load terminals.

Abstract: An offset assembly for a circuit breaker includes at least one two plane member having a first plate and a second plate. The first and second plates are joined at an edge and extend generally perpendicular to each other. The second plate is structured to be coupled to the quick disconnect and the first plate is structured to be coupled to the circuit breaker terminal so that the second plate is not aligned with the centerline of the circuit breaker terminal.

Abstract: A circuit breaker includes a molded housing, separable contacts, an operating mechanism adapted to open and close the separable contacts, and a trip circuit cooperating with the operating mechanism to trip open the separable contacts. The molded housing includes two molded halves. The trip circuit includes a pair of arc fault printed circuit boards which cooperate with the corresponding molded halves to form an external composite structure. That external composite structure includes the printed circuit boards and an over-molding material, such as, for example, a thermally conductive epoxy coating disposed thereon.

Abstract: In the electromagnetic switching device, it is possible to miniaturize and have low costs, have quiet operation noise, and also quickly extinguish the arc. The electromagnetic switching device has an electromagnetic actuator with a movable iron core, a pair of fixed terminals that respectively have a fixed contact point, a movable contact that has movable contact points on the right and left ends, a shaft, and an enclosing component that holds the movable contact points and the fixed contact points. The pair of movable contact points respectively contact with and detach from the pair of fixed contact points, and the pair of fixed contact points respectively conduct each other and are insulated again through the shaft by moving the movable iron core along the axis using the electric magnetic actuator. A quasi-hermetically sealed space, which is the extinguishing space, is formed by the enclosing component and a first yoke.

Abstract: A circuit breaker has a molded case with a main case, a middle cover and a top cover being dividable from one another. The main case contains contactor sections, each including a stationary contactor and a movable contactor for a pole corresponding to each phase in a polyphase circuit, an arc-extinguishing device, an overcurrent tripping device actuating a tripping mechanism by detecting an overcurrent, and a zero-phase current transformer detecting a leak current. The middle cover has a partitioned recess for containing a switching mechanism and the tripping mechanism. Interpole partitions, surrounding the contactor section and the arc-extinguishing device, and a screen-like intermediate partition, isolating the contactor sections from the overcurrent tripping device, are formed with the middle cover laid on the main case. A wall with gas outlets for an arc gas is provided on the back of the arc-extinguishing devices.

Abstract: A removable universal terminal assembly has a molded housing that clips onto an electric power switch and two terminal members that can be alternatively installed in the molded housing to provide either a quick connect termination or a binding post termination.

Abstract: An electric pole for a low-voltage power circuit breaker, comprising an insulating enclosure (20, 30) that has a lower wall, an upper wall, two side walls, a rear wall and a front wall, at least one arc chute, at least one fixed contact (8) and at least one moving contact (9) that can be mutually coupled/uncoupled, and a first electric terminal (10) and a second electric terminal (11) that are functionally associated with the fixed contact and the moving contact and allow electrical connection of the pole in input and in output, its particularity consisting of the fact that the insulating enclosure comprises a first half-shell (20) and a second half-shell (30) which are mutually coupled along corresponding coupling surfaces and form a self-supporting structure, the first and second half-shells being shaped so as to form at least one compartment (12) that is suitable to accommodate the fixed contact and the moving contact and the arc chute, and second (13) and third containment volumes (14), which are arranged

Abstract: A plugboard for housing sockets and micro-relays, of the type used for housing a plurality of connectors suitable for mounting sockets or micro-relays, which is composed of a base (1) and a plurality of holes (4) for housing connectors (2) suitable for mounting sockets or micro-relays Said holes (4) not being but instead rotated 180° with regard to the position of the adjacent holes (4) intended for housing the connectors (2) suitable for mounting sockets or micro-relays to said plugboard.

Abstract: Electrical switching device with a switching housing designed to be fitted with at least one switching polar assembly (80) comprising two arc extinguishing splitters blocks (81,82) located on each part of a contact bridge (83) movable along a horizontal axis. The switching housing comprises a first element (20) comprising a bottom (21) formed from a first horizontal face of the switching device (10), so as to form a tank with a cavity (29) that houses a first splitters block (81), and a second element (30), assembled to the first element (20), comprising a bottom (31) formed from a second horizontal face of the switching device (10), opposite the first horizontal face, so as to form a tank with a cavity (39) that collects the second splitters block (82). The invention also relates to a method of assembling such a switching device.

Abstract: An electromechanical switch includes a main contact provided with a number of main fixed contacts and a mobile main contact bridge; an auxiliary contact which precedes the main contact in the switch-on process and includes a number of auxiliary fixed contacts and a mobile auxiliary contact bridge; and a contact bridge carrier for actuating the main contact bridge and the auxiliary contact bridge. At least one of the contact parts is spring-mounted. The electromechanical switch has two stable positions of the auxiliary contact bridge or the auxiliary fixed contact.

Abstract: A rotating display device displays a value in a variable viewing orientation. The value is received from an electrical apparatus, such as a circuit breaker, having a first port. The rotating display device includes a housing having a first side and a second side, a display disposed on the first side of the housing, a rotating assembly disposed on the second side, and a second port for receiving the value from the first port of the electrical apparatus. The second port communicates with the display and is coupled to the rotating assembly in order to permit the display to rotate. The rotating assembly permits the rotating display device to rotate in the plane of the surface of the circuit breaker on which it is mounted, thereby permitting the display to be quickly and accurately viewed and interpreted regardless of the orientation of the surface to which it is coupled.

Abstract: A mold frame is formed with two collision sections opposed to a back face of a movable iron core with a movable contact support therebetween. One collision section is higher than the other. The movable contact support includes an inclined plane on the base bottom face thereof and near the higher collision section. The base bottom face abuts the back face of the movable core. When this contactor is attached with the higher collision section provided at the lower side, the support having collided in the “released” condition is rotated around the collision section, thereby reducing the impact. When this contactor is attached with the lower section at the lower side, the support attracted toward the core by a plate spring is allowed to collide, at the bounce of the support, with the back face of the core via the inclined plane, thereby canceling the inertia by the bounce.

Abstract: The aim of the invention is to provide a switching device (1) based on a uniform control tile, which is easy to produce and assemble, ensuring good electric insulation properties. To achieve this, the device comprises an adapter (12) with second contact means (13), arranged to form a connection between first contact means (7, 8) and a conductor (10) that is to be connected. Said adapter and second contact means have insulating isolating elements (18, 18a, 18b, 18c), at least bordering several sides, for defined creepage distances and clearances.

Abstract: A shutter assembly for a shuttered bus assembly is provided. The shuttered bus assembly is coupled to a circuit breaker housing assembly. The circuit breaker housing assembly is structured to enclose a circuit breaker assembly. The circuit breaker assembly is structured to move generally horizontally in and out of the circuit breaker housing assembly. The circuit breaker assembly has a plurality of finger connectors extending generally horizontally from the back side of the circuit breaker assembly. The shuttered bus assembly has at least one pair of conductors which extend toward the front of said housing assembly. The finger connectors are structured to engage the conductors. The shutter assembly includes a mounting assembly and a door panel. The mounting assembly is structured to be coupled to the housing assembly.

Abstract: The circuit breaker is intended for installation in a low-voltage distribution board having a socket and having at least two busbars which are guided parallel, are held on the socket and are each associated with one pole conductor of a multiphase power supply system. This circuit breaker has an enclosure as well as a plug contact for making contact with one of the busbars. The plug contact can be positioned as a function of the position of the busbar with which contact is to be made, and is held on a contact mount, which can be moved transversely with respect to the busbars and can be locked to the circuit breaker enclosure. In a circuit breaker such as this, a pole conductor change from one busbar to another busbar can be carried out quickly and without the use of any tools.

Abstract: A receptacle includes an insulated outer case, first and second trip switches formed on an inner bottom of the insulated case, a reset switch formed on the inner bottom of the insulated outer case, a cover disposed on a top of the outer case, first and second test buttons disposed in the insulated outer case to be movable in a vertical direction, each of the first and second test buttons having a bottom adjacent to the corresponding trip switch and a top exposed through the cover, a first spring for biasing the first and second test buttons to an initial position, a reset button disposed in the insulated outer case to be movable in a vertical direction, the reset button having a bottom adjacent to the reset switch and a top exposed through the cover, and a locking portion for selectively locking the reset button in response to the vertical motion of the first and second test button.

Abstract: The invention concerns a control and protection module (10) for a low voltage multipolar switch device that is comprised of a connector base (50), a control electromagnet (41) and a trip mechanism (42) capable of acting upon the moving contacts (52) in order to open and break the power poles. The detachable control and protection unit (10), an electronic board (20) which has a processing unit (30), a control device (31) and a protection device (32), responsible respectively for operating the electromagnet and the trip mechanism in response respectively to a control signal (310) and a trip signal (320) transmitted by the processing unit (30). The processing unit can suppress the control signal (310) from the electromagnet (41) in the event of malfunction of the protection device (32).

Abstract: A circuit breaker includes a housing including a primary cover and a secondary cover having a tab; separable contacts; and an operating mechanism adapted to open and close the separable contacts. The operating mechanism includes a cradle pivotally mounted within the housing, the cradle including a latch, and a latch mechanism within the housing. The latch mechanism is adapted to capture the latch of the cradle when the separable contacts are closed. The operating mechanism also includes a rotary interlock pivotally mounted within the housing and cooperating with the latch mechanism and the tab of the secondary cover to release the latch of the cradle and to trip open the separable contacts when the secondary cover is removed from the primary cover.

Abstract: A circuit breaker includes a crank for coupling a rotary arm breaker mechanism to the cradle. The crank has a protrusion which cooperates with a handle yoke to restrict movement of the operating handle when the contacts of the circuit breaker are welded. The crank protrusion is arranged such that it does not interfere with the handle under normal operating conditions.

Abstract: A circuit breaker includes a housing having first and second openings, with stationary and movable separable contacts disposed therein. An operating mechanism is disposed in the housing, is coupled to the separable contacts and is structured to move those contacts between open and closed positions. A trip mechanism is disposed in the housing and cooperates with the operating mechanism to trip open the separable contacts. A slot motor assembly is disposed about the separable contacts and has upper and lower slot motor portions. The upper slot motor portion is disposed above the movable contact and the lower slot motor portion is disposed below the stationary contact. The upper slot motor portion includes a rigid, laminated steel member having a general U-shape, with a bight portion, and first and second legs. The first and second legs engage the housing at the respective first and second openings.

Abstract: A high-frequency relay comprises a body containing a contact unit having at least one contact terminal protruding from a bottom surface of the body, contact states switched according to energization of a coil and a base covering at least a bottom surface of the body. The contact unit is connected with at least one contact terminal. The base has a grounding function and includes a conductive layer.

Abstract: A terminal assembly can be alternatively used to make either a pressure plate or screw type connection for connecting stranded wire or solid wire, respectively, to a power conductor of electric power apparatus such as a circuit breaker. An electrically insulative barrier has an elongated member with a lateral extension at one end having a recess that captures the head of the screw of a terminal collar for the pressure plate connection. As the screw is tightened, the collar is drawn toward the power conductor to clamp the stranded wire between the collar and one side of the power conductor. With the elongated member turned end for end, the screw is free to clamp the solid wire against the other side of the power conductor. Pairs of integral compliant latches on the elongated member accommodate quick conversion between the two types of connections.

Abstract: A signal accessory for a molded case circuit breaker, with the circuit breaker (10) having an operating mechanism (40) with a cradle pin (41b), a cross bar (55) and a trip bar (54) and a main breaker cover (20). The signal accessory (300) comprises a signal accessory mounting (301) having a bottom mount (308) and a top mount (306) coupled to the bottom mount (308) with the top mount configured to receive a switch (302, 304) and engage the breaker cover (20) in an accessory socket (22). A switch member (311) is rotably mounted on the bottom mount (308) with the switch member (311) having an actuator lever (322) in contact with the operating mechanism (40) of the circuit breaker (10) and an actuator pad (314) in contact with a switch mounted on the top mount (306).

Abstract: A direct current contactor having at least one low current terminal and at least two high current terminals is disclosed. The low current terminal is connected to a spring, which is nested in a chimney-shaped receptacle, where it is coupled to the contactor's coil. The chimney shaped receptacle also has a slot that receives a terminal blade that electrically connects the spring to the coil. The housing of the solenoid is designed with longitudinally extending channels that receive the receptacles, which prevents the assembly from rotating within the housing unit. Each terminal is provided with ribbed and knurled areas to restrict rotation of the terminal in the housing and the mating connection while tightening.

Abstract: A load terminal cover assembly for use on circuit breakers installed in electrical enclosures. The assembly selectively limits access to circuit breaker load terminals and uninsulated portions of load conductors entering the load terminals when the enclosure cover assembly is removed.

Abstract: A multipole cassette assembly having a center pole cassette assembly includes a first side and a second side, a first outer pole cassette assembly having a first side and a second side, a first spacer interlocking receptacle positioned on one of the first side of the center pole cassette assembly and the second side of the first outer pole cassette assembly, and a first interlocking spacer positioned on one of the first side of the center pole cassette assembly and the second side of the first outer pole cassette assembly, wherein the first interlocking spacer is engaged with the first spacer interlocking receptacle. A method for maintaining spacing between poles of the multipole cassette assembly includes providing an interlocking spacer on the first cassette assembly, providing an interlocking receptacle on a second cassette assembly, and engaging the interlocking spacer with the interlocking receptacle.

Abstract: A molded insulator cover for a circuit breaker molded case includes a terminal connector attachable to the strap terminal. The terminal connector is disposed in the circuit breaker molded case and an insulator discrete from the molded case is disposed around the terminal connector. The insulator is trapped into the circuit breaker molded case by attachment of the terminal connector to the strap terminal. The insulator is configured to be used with a plurality of different field installable terminal connectors.

Abstract: A gas segregator barrier is for quenching, segregating and controllably directing ionized gases discharged from a pair of spaced-apart circuit breakers double-branch mounted within a panelboard assembly. The spaced-apart circuit breakers include corresponding pairs of opposing poles, and a housing with exhaust vent openings for discharging ionized gases developed from an electrical fault. The gas segregator barrier includes at least substantially parallel segregator fins divided into first and second portions by a transverse dividing member. Baffles in the transverse dividing member quench the ionized gases and provide fluid communication between exhaust channels formed between the segregator fins of the first portion, and gas ducts disposed between the segregator fins of the second portion. The gas ducts include one or more lateral members structured to controllably direct the discharged ionized gases.

Abstract: An electromagnetic relay is simple in construction, can prevent entry of dust, etc. into an interior thereof, enables confirmation of operation, and is provided an operating lever that can be maintained in an operating state. A coil block and a contact switching mechanism are provided on a base plate, a casing covers the base plate, and a movable iron piece is turned by magnetizing and demagnetizing the coil block, and a movable contact piece is operated to make and break contacts. An operating part that is turned by directing pushing the movable iron piece is arranged on an upper surface of the casing, and covered by a cover. An operating lever is mounted on the cover in a manner to enable sliding operation. The operating lever can be positioned in a closed position, in which an operating part is covered, a first opened position, in which the operating part is exposed, and a second opened position, in which the operating part is operated, respectively.

Abstract: A pressure sensitive trip mechanism for actuating a circuit breaker operating mechanism to trip a circuit breaker includes a trip lever and a trip bar. The trip lever is rotatable about a first pivot. The trip bar is positioned proximate the trip lever. The trip bar is arranged to rotate about a second pivot in response to a predetermined level of pressurized gas created by separation of the pair of electrical contacts, thereby urging the trip lever to unlatch the circuit breaker operating mechanism. The pressure sensitive trip mechanism provides for very fast tripping of the circuit breaker in the event of a short circuit condition or an overcurrent fault condition within any one on the circuit breaker poles. In a multi-pole circuit breaker, the present invention provides for protection against single-phasing.

Abstract: An electromagnetic relay having superior visibility and a light-emitting device easy to mount. A coil block and a contact opening and closing mechanism are disposed on a base plate and covered with a case, and the electromagnetic relay magnetizes and demagnetizes the coil block via coil terminals to turn a movable core and moves a movable contact part to open and close a contact. Electrical connection portions of the coil terminals are projected upwardly through the top side of the case. A light-emitting device which emits light by the energization of the coil terminals and a holder which holds the light-emitting device are disposed on the top side of the case on the side opposite to a position where the electrical connection portions of the coil terminals of the case are projected. Lead wires connected to the light-emitting device are electrically connected to the electrical connection portions of the coil terminals.

Abstract: In an electromagnetic switching device including a cylindrical part made of a magnetic material with a closed bottom for housing a movable iron core having a movable contact and so constructed as to render the movable contact movable toward and away from a fixed contact, a joint member made of a metallic material with an insertion hole formed substantially in the center thereof for movably receiving a movable shaft fixedly attached to the movable iron core, and a metal plate made of a non-magnetic material with a hole formed substantially in the center thereof with the inner diameter substantially the same as the inner diameter of the cylindrical part, the cylindrical part and the joint member are air-tightly jointed to each other with the metal plate provided therebetween, and the movable iron core is housed in the cylindrical part with a clearance defined between the movable iron core and the joint member corresponding to a required stroke within which the movable contact contacts the fixed contact.