Abstract: A contact device and an electromagnetic contactor using the contact device. The contact device has: a main contact including a pair of fixed contact elements arranged at a predetermined distance from each other and a movable contact element elastically supported by a connecting shaft and arranged to be contactable with and separable from the pair of fixed contact elements; an auxiliary contact arranged at a position different from the main contact and including a pair of fixed contacts arranged at a predetermined distance from each other and a movable contact connected to the connecting shaft and arranged to be contactable with and separable from the pair of fixed contacts; a contact housing configured to house the main contact and the auxiliary contact; and external connection terminals electrically connected to the pair of fixed contacts of the auxiliary contact and projecting from the contact housing.

Abstract: To provide an electromagnetic contactor that allows the extension space for arcs to be enlarged without having to enlarge the size in a direction in which a main contact mechanism housing chamber and an auxiliary contact mechanism housing chamber are arranged. An electromagnetic contactor includes a partitioning wall for partitioning a main contact mechanism housing chamber and an auxiliary contact mechanism housing chamber. The partitioning wall has a pair of arc extension recesses that is formed by indenting the partitioning wall toward the side of the auxiliary contact mechanism housing chamber.

Abstract: The contact device includes a main contact mechanism that includes a pair of main fixed contacts and a main movable contact elastically supported by a movable shaft and disposed to be contactable with and separable from the pair of main fixed contacts, an auxiliary contact mechanism that includes a pair of auxiliary fixed contacts and auxiliary movable contacts disposed in an auxiliary contact holding member connected to the movable shaft so as to be contactable with and separable from the pair of auxiliary fixed contacts, and a contact housing portion that houses the main contact mechanism and the auxiliary contact mechanism. The movable shaft has a main contact support portion supporting the main movable contact and an auxiliary contact support portion supporting the auxiliary contact holding member. The main contact support portion and the auxiliary contact support portion are connected to each other via the auxiliary contact holding member.

Abstract: An electromagnetic switch includes a contact housing case; a plurality of contact mechanisms each having a fixed contact and a movable contact contacting to and separating from the fixed contact, and disposed in parallel inside the contact housing case; a movable contact holding portion holding the movable contacts of the plurality of contact mechanisms; and an electromagnet unit having a movable plunger moving the movable contact holding portion.

Abstract: A contact device includes a pair of fixed contacts fixedly disposed inside an arc extinguishing chamber and maintaining a predetermined interval from each other; a movable contact disposed inside the arc extinguishing chamber, and contacting to and separating from the pair of fixed contacts; a first arc root movement promotion portion formed on the pair of fixed contacts, and promoting a movement of a root of an arc in a direction away from the movable contact, the arc being generated when contacts are opened in which the movable contact moves away from the pair of fixed contacts; and a second arc root movement promotion portion formed on the movable contact, and promoting a movement of the root of the arc in a direction away from the relevant fixed contact.

Abstract: An electromagnetic contactor includes a contact device having a pair of fixed contacts disposed to maintain a predetermined distance and a movable contact disposed so as to contact to and detach from the pair of fixed contacts. An insulating cover, which covers the pair of fixed contacts except for contact portions that contact the movable contact and covers an inner surface of an insulating plate that fixes and holds the fixed contacts, is mounted on the pair of fixed contacts.

Abstract: An electromagnetic contactor includes a fixed contact portion, a movable contact portion disposed facing the fixed contact portion to contact to and separate from the fixed contact portion, and an arc extinguishing receptacle forming an arc extinguishing chamber housing the fixed contact portion and movable contact portion. Among contact surfaces of the movable contact portion and fixed contact portion facing each other, at least an opposing distance between a contact end portion of the fixed contact portion and a contact end portion of the movable contact portion positioned in a moving direction of an arc generated when separating the movable contact portion from the fixed contact portion is set to increase with increasing proximity to end surfaces on contact end portion sides.

Abstract: In an electromagnetic contactor, an arc generated when a movable contact separates from fixed contacts can be easily extinguished. The movable contact is disposed so as to be connectable to and detachable from the pair of fixed contacts disposed to maintain a predetermined interval inside a contact housing case having insulating properties, and an arc extinguishing chamber is formed in a position in which the movable contact and the pair of fixed contacts contact. At least the inner wall surface side of the arc extinguishing chamber contacting an arc is formed of a high thermal conductivity material having thermal conductivity higher than that of a synthetic resin molded material.

Abstract: An electromagnetic switch includes a main contact housing portion housing a main contact mechanism having a pair of fixed contacts fixedly disposed maintaining a predetermined interval and a movable contact disposed to connect with and separate from the pair of fixed contacts in a contact housing case; an auxiliary contact housing portion housing at least two auxiliary contact mechanisms having fixed contacts and movable contacts disposed connecting to and separating from the fixed contacts; and an electromagnet unit having a movable plunger individually coupled to move the movable contact of the main contact mechanism and the movable contacts of the auxiliary contact mechanisms. The main contact housing portion, the auxiliary contact housing portion, and the electromagnet unit are disposed in series.

Abstract: An electromagnetic contactor includes a contact device including a pair of fixed contacts and a movable contact contacting to and separating from the pair of fixed contacts. The pair of fixed contacts includes support conductor portions supported with an upper surface of a contact housing case, and C-shaped portions each including an upper plate portion linked to an end portion of the support conductor portion, an intermediate plate portion extending downward from a side of the upper plate portion opposite to that of the other support conductor portion, and a lower plate portion extending from a lower end of the intermediate plate portion toward a side of the other support conductor portion and formed with a contact portion on an upper surface thereof. The contact housing case includes contact bearing portions bearing a side of the lower plate portions of the pair of fixed contacts opposite to the movable contact.

Abstract: An electromagnetic contactor includes a contact mechanism having a pair of fixed contacts disposed to maintain a predetermined interval in a longitudinal direction, and a movable contact disposed above the pair of fixed contacts, the movable contact contacting to and detaching from the pair of fixed contacts. Each of the pair of fixed contacts has a fixed contact portion, the movable contact extends in a longitudinal direction thereof and has a pair of movable contact portions contacting the pair of fixed contacts, and the movable contact is disposed so as to move in a vertical direction thereof on a connecting shaft fixed to a movable plunger and is pressed down by a biasing force of a contact spring in a downward direction thereof on a central portion of the movable contact in the longitudinal direction, the movable contact being held on the connecting shaft.

Abstract: The electromagnetic contactor has a pair of fixed contacts disposed to maintain a predetermined interval and a movable contact disposed so as to be attachable to and detachable from the pair of fixed contacts, and an electromagnet unit that drives the movable contact. The electromagnet unit has a magnetic yoke enclosing a plunger drive portion, a movable plunger having a leading end protruding through an aperture formed in the magnetic yoke and biased by a return spring, an annular permanent magnet fixedly disposed so as to enclose a peripheral flange portion formed on a protruding end side of the movable plunger and magnetized in a direction in which the movable plunger can move, and an auxiliary yoke disposed on the annular permanent magnet at a side opposite to that of the magnetic yoke and regulating a movement of the peripheral flange portion of the movable plunger.

Abstract: A switch has a pair of fixed contacts installed in an arc extinguishing container and disposed to maintain a predetermined space therebetween, and a movable contact disposed so as to come into and out of contact with the pair of fixed contacts. The arc extinguishing container includes an open-topped tub-shaped metal body, an insulating holding member which holds the pair of fixed contacts, disposed on an inner side of the tub-shaped metal body, opposite to the movable contact, and an open-bottomed tub-shaped resin cover which covers the pair of fixed contacts and the movable contact from an open edge face side of the tub-shaped metal body. A periphery of an open edge of the resin cover is sealed to a bottom surface of the tub-shaped metal body with an adhesive agent.

Abstract: A contact device includes a pair of fixed contacts fixedly disposed inside an arc extinguishing chamber and maintaining a predetermined interval from each other; a movable contact disposed to contact to and separate from the pair of fixed contacts; and an arc root movement promotion portion formed on the movable contact to promote a movement of root of arc in a direction away from the fixed contacts. The root of arc is generated when the movable contacts are opened and separated from the pair of fixed contacts.

Abstract: An electromagnetic contactor includes a pair of fixed contact portions having a predetermined distance from each other; a movable contact including a pair of movable contact portions disposed facing the pair of fixed contact portions; a movable support body supporting a central portion of the movable contact in an extending direction of the movable contact; a housing receptacle formed from a non-conductive body, housing at least the pair of fixed contact portions and the movable contact; an electromagnet unit causing the movable support body to move back and forth to cause the movable contact portions to contact to and separate from the fixed contact portions; and sliding guides extending along a moving direction of the movable contact for moving the movable contact back and forth in the housing receptacle to regulate a turning displacement of the movable contact. The sliding guides are different from the housing receptacle.

Abstract: An electromagnetic switch includes a pair of fixed contacts fixed in a contact housing case with a predetermined distance therebetween; a movable contact disposed in the contact housing case to contact to and separate from the pair of fixed contacts; and an electromagnet unit causing the movable contact to contact to and separate from the pair of fixed contacts. The electromagnet unit has a magnetic yoke enclosing an exciting coil, a movable plunger disposed to move through a through hole provided in the magnetic yoke and having a contact pole surface facing the contact pole surface of the magnetic yoke, and a linking shaft linking the movable plunger and the movable contact. The contact pole surface of the movable plunger includes a circular protruding portion having a width narrower than that of a surface facing the magnetic yoke for increasing a magnetic flux density.

Abstract: The electromagnetic contactor includes a contact mechanism including a pair of fixed contacts disposed to maintain a predetermined interval and a movable contact disposed so as to connect to and separate from the pair of fixed contacts, and an electromagnet unit that drives the movable contact. The electromagnet unit includes a magnetic yoke enclosing a plunger drive portion, a movable plunger, a leading end thereof protruding through an aperture formed in the magnetic yoke and a peripheral flange portion being formed on a protruding end side, movement regulating portions that regulate movement of the peripheral flange portion of the movable plunger in an engaged position and released position of the contact mechanism, and a contact noise suppression member that suppresses contact noise when the peripheral flange portion of the movable plunger contacts the movement regulating portions.

Abstract: A method for assembling an arc-extinguishing chamber of an electromagnetic contactor includes a step of fixing a pair of fixed contacts each including a support conductor and a C-shaped part, to a bottom plate part of the arc-extinguishing chamber having a tub-shape with one end being open, the C-shaped part defining inside of the arc-extinguishing chamber; a step of installing an insulation cover covering a part other than a contact point part of each C-shaped part of the pair of fixed contacts; and a step of disposing a movable contact to be capable of contacting to and separating from the contact point parts of the fixed contacts.

Abstract: A contact device includes a contact mechanism including a pair of fixed contacts disposed to maintain a predetermined distance and a movable contact disposed to be capable of contacting to and separating from the pair of fixed contacts. The movable contact has a conductive plate portion extending in a direction crossing a moving direction of the movable contact in a contact housing case. Each of the pair of fixed contacts includes an inner side conductor plate portion having one end and the other end portion extending toward the outside of the contact housing case in parallel to the conductive plate portion, and an outer side conductor plate portion connected to the other end portion of the inner side conductor plate portion and extending in a direction separating from the movable contact, to form an L-shaped conductor portion to generate a Lorentz force opposing an electromagnetic repulsion force.