The present invention relates to an electromagnetic contactor, and more particularly, to an electromagnetic contactor for star-delta driving, which is capable of rapidly and safely switching a connection of a 3-phase motor from a star connection to a delta connection and simplifying configurations of a connection circuit and an opening/closing device. According to the electromagnetic contactor for star-delta driving and a control device thereof of the present invention, the connection of the 3-phase motor can be switched rapidly and safely from the star connection to the delta connection, and the configuration of the connection circuit and a control circuit of a power supply thereof and a magnetic switch configuration can be simplified, and thus, there is an effect of saving space by reducing the size and weight of a product and reducing the numbers of power wirings and control circuit wirings. In addition, a magnetic switch between star and delta connections is interlocked by using a timer and an auxiliary contact, so as to improve the convenience of an operator and reduce construction time. In addition, because a timer base and the control device are ready-made in the form of manufactured goods, it is easy to use the products and there is very little risk of causing a misconnection in the control device. Thus, there are effects of improving the safety of a construction operator at a construction site and a general user, and improving driving components and circuit protection.

An anti-short circuit structure (10) of a high-capacity relay, the structure (10) comprising a housing assembly (100) and a pushing assembly (200). The housing assembly (100) comprises two static contacts (110), a first magnetically conductive block (120), a cover body (130), a transition block (160), and a yoke plate (140). The first magnetically conductive block (120) is disposed on an inner side surface of the top part of the cover body (130). The pushing assembly (200) comprises a fixing support (210), a stop piece (220), a movable reed (230), a second magnetically conductive block (240), an elastic member (250), and a push rod (260). The fixing support (210) comprises two fixing side arms (211) and a receiving plate (212). One end of the stop piece (220) is connected to the tail end of one fixing side arm (211), and the other end of the stop piece (220) is connected to the tail end of the other fixing side arm (211). Two ends of the movable reed (230) are disposed facing the two static contacts (110) respectively, and the second magnetically conductive block (240) is disposed facing the first magnetically conductive block (120). The first magnetically conductive block (120) and the second magnetically conductive block (240) are used to form magnetic flux. In the described anti-short circuit structure (10), when a coil is excited, the positions of the first magnetically conductive block (120) and the second magnetically conductive block (240) do not change due to overtravel. A magnetic air gap does not increase as overtravel increases, and an increase in overtravel does not affect magnetic attraction and does not affect the anti-short circuit function of the relay.

An electromagnetic relay includes a base, a first terminal, a fixing member, and a first adhesive. The base includes a first hole. The base is made of a thermosetting resin. The first terminal extends through the first hole. The fixing member is a separate body from the base. The fixing member has higher elasticity than the thermosetting resin. The fixing member fixes the first terminal to the base. The fixing member includes a first support wall and a first recess. The first support wall is disposed between an inner surface of the first hole and the first terminal. The first support wall extends upward along the first terminal. The first recess is disposed on an upper surface of the first support wall and faces the first terminal. The first adhesive is filled in the first recess. The first adhesive adheres the first terminal and the first support wall.

An electromagnetic relay includes a first movable contact piece, a moving member, a coil, and a movable iron core. The moving member holds the first movable contact piece. The movable iron core is connected to the moving member and is configured to move by a magnetic force generated by the coil. The moving member is made of resin having electrical insulation. The moving member includes a first member and a second member. The second member is connected to the first member by snap fitting. The first member includes a first protrusion. The second member includes a second main body, a first locking portion, and a first arm. The first locking portion locks to the first protrusion. The first arm connects the second main body and the first locking portion. A thickness of the first arm is smaller than a thickness of the first locking portion.

An electromagnetic relay includes a moving member, a yoke, a guide member, and a movable iron core. The yoke includes a plate portion and a yoke hole. The guide member is disposed in the yoke hole. The movable iron core is connected to the moving member.

The movable iron core includes a tubular portion. The tubular portion includes a first end surface and a second end surface. The tubular portion is disposed in the guide member. The plate portion includes a first surface and a second surface. In a case where the moving member is located at the closed position, the first end surface is located within a range from a first position to a second position. The first position is a position corresponding to the first surface. The second position is located at a center of the first surface and the second surface.

An electromagnetic relay includes a first movable contact piece, a moving member, a coil, and a movable iron core. The movable iron core is connected to the moving member and is configured to move by a magnetic force generated by the coil. The moving member is made of an electrical insulator. The moving member includes a support portion and a connecting portion. The support portion holds a first movable contact piece. The connecting portion is connected to the movable iron core. The connecting portion includes a locking groove and a locking projection. An end of the movable iron core is disposed in the locking groove. The locking projection presses the end of the movable iron core in the locking groove. The locking projection extends in a support direction perpendicular to a moving direction of the moving member.

An electromagnetic relay includes a first movable contact piece, a first movable contact, a second movable contact, a moving member, a coil, and a movable iron core. The moving member holds the first movable contact piece. The moving member is made of a resin having electrical insulation. The moving member includes a first member and a second member. The first member is connected to a movable iron core. The second member is a separate body from the first member. The second member is connected to the first member by snap fitting. The first member includes a convex portion. The convex portion projects toward the second member in a moving direction of the moving member. The second member includes an inspection hole. The inspection hole faces the convex portion in the moving direction and extends in the moving direction.

An electromagnetic relay of the present disclosure includes a fixed terminal having a fixed contact, a movable contactor having a movable contact, a movable portion that moves the movable contactor between a first position and a second position, an electromagnet device that drives the movable portion, a contact container that contains the fixed contact and the movable contact, a housing that contains the contact container and has a first opening, a sealing material disposed in a path communicating with an outside of the electromagnetic relay, the path being between the housing and the contact container, and a heat conductive member disposed in a first region surrounded by the contact container, the housing, and the sealing material. When the movable contactor is at the first position, the fixed contact is not in contact with the movable contact, when the movable contactor is at the second position, the fixed contact is in contact with the movable contact, and a part of the fixed terminal is exposed to the outside from the first opening.

A contact point device includes a fixed contact, a movable contactor that has a movable contact capable of being in contact with the fixed contact by moving in parallel with a first direction, a containing chamber that contains the fixed contact and the movable contact, and a shielding wall disposed inside the containing chamber. The shielding wall is located in the first direction from the fixed contact and the movable contact when viewed in a second direction orthogonal to the first direction, the shielding wall extends along the first direction, and the shielding wall is provided with one or a plurality of through holes that penetrate the shielding wall.

A relay has a first fixed contact, a second fixed contact, a movable touch piece including a first movable contact that is disposed facing the first fixed contact, and a second movable contact that is disposed facing the second fixed contact, the movable touch piece being disposed so as to be movable in a contact direction in which the first movable contact and the second movable contact come into contact with the first fixed contact and the second fixed contact and a separation direction in which the first movable contact and the second movable contact separate from the first fixed contact and the second fixed contact, and a drive device disposed in the contact direction with respect to the movable touch piece and configured to generate a driving force for moving the movable touch piece.