JP2022099570A - Electromagnetic relay - Google Patents

Abstract

To extend an arc in a space on the back side of a movable contact piece in an electromagnetic relay.SOLUTION: An electromagnetic relay comprises: a first stationary terminal; a movable contact piece; a driving device; and a magnet part. The first stationary terminal includes a first stationary contact. The movable contact piece includes a first movable contact facing the first stationary contact. The movable contact piece is movable in a first direction. The first direction includes a contact direction in which the first movable contact approaches the first stationary contact, and an opening direction in which the first movable contact opens from the first stationary contact. The driving device moves the movable contact piece in the first direction. The magnet part generates, in a second direction, a magnetic field for extending an arc generated between the first stationary contact and the first movable contact. The second direction is orthogonal to the first direction. The first stationary terminal includes a terminal extension part not overlapping the movable contact piece when seen from the first direction. The terminal extension part includes a first extension part that extends in an extension direction in which the arc is extended when seen from the second direction, and a second extension part that is bent in the opening direction from the first extension part.SELECTED DRAWING: Figure 6

Description

The present invention relates to an electromagnetic relay.

Conventionally, an electromagnetic relay that opens and closes an electric circuit is known. For example, the electromagnetic relay of Patent Document 1 includes a fixed terminal including a fixed contact, a movable contact piece including a movable contact, and a permanent magnet. The permanent magnet generates a magnetic field for extending the arc generated when the movable contact is separated from the fixed contact. As a result, Lorentz force acts on the arc to extend the arc.

Japanese Patent No. 6281301

In electromagnetic relays, there are cases where it is desired to greatly extend the arc in one direction in order to make effective use of space or the like due to design reasons. In particular, since the operating space of the movable contact piece is provided on the back side of the movable contact piece (the side opposite to the side where the movable contact is arranged), the movable contact piece is formed by extending the arc in the space behind the movable contact piece. You can make effective use of the operating space of. Further, in Patent Document 1, there is a possibility that the arc hits the resin wall and the resin wall deteriorates.

An object of the present invention is to extend an arc in a space behind a movable contact piece in an electromagnetic relay.

The electromagnetic relay according to one aspect of the present invention includes a first fixed terminal, a movable contact piece, a drive device, and a magnet portion. The first fixed terminal includes a first fixed contact. The movable contact piece includes a first movable contact facing the first fixed contact. The movable contact piece is movable in the first direction. The first direction includes a contact direction in which the first movable contact approaches the first fixed contact and an opening direction in which the first movable contact separates from the first fixed contact. The drive device moves the movable contact piece in the first direction. The magnet portion generates a magnetic field in the second direction for extending the arc generated between the first fixed contact and the first movable contact. The second direction is orthogonal to the first direction. The first fixed terminal includes a terminal extension portion that does not overlap with the movable contact piece when viewed from the first direction. The terminal extension portion includes a first extension portion extending in the extension direction in which the arc is extended when viewed from the second direction, and a second extension portion bent in the opening direction from the first extension portion.

In this electromagnetic relay, the back side of the movable contact piece is guided by the movement of the arc generated between the first fixed contact and the first movable contact by the first extension portion and the second extension portion of the terminal extension portion. The arc can be extended in the space of. Specifically, the end of the arc moving through the first fixed terminal is guided in the opening direction by the second stretching portion that bends in the contact direction after passing through the first stretching portion extending in the extending direction. Then, after the end of the arc moves in the opening direction, the Lorentz force in the opening direction acts on the arc, so that the arc can be extended in the space behind the movable contact piece. Further, for example, the second stretched portion can suppress the deterioration of the resin wall due to the arc hitting the resin wall located in the extending direction.

The second stretched portion may have a tapered shape in which the dimension in the second direction gradually decreases. In this case, it becomes easy to control the extension direction of the arc.

The movable contact piece may be movable between a closed position where the first movable contact contacts the first fixed contact and an open position where the first movable contact is separated from the first fixed contact. The second stretched portion may protrude in the contact direction from the movable contact piece when the movable contact piece is in the open position. In this case, the arc can be more effectively extended in the space behind the movable contact piece. Further, for example, the second stretched portion can more effectively suppress the deterioration of the resin wall due to the arc hitting the resin wall located in the extending direction.

The electromagnetic relay may further include a second fixed terminal including a second fixed contact located away from the first fixed contact in a third direction orthogonal to the first and second directions. The movable contact piece may further include a second movable contact facing the second fixed contact and a step portion that restricts the arc from moving toward the center of the movable contact piece in the third direction. In this case, for example, the step portion can prevent the arc from hitting a movable member such as a drive shaft arranged at the center of the movable contact piece.

The terminal extension portion of the first fixed terminal may further include a gas vent hole formed at the boundary between the first extension portion and the second extension portion. In this case, the retention of hot gas can be suppressed by the degassing hole.

The terminal extension portion of the first fixed terminal may further include a gas vent hole formed in the second extension portion. In this case, the retention of hot gas can be suppressed by the degassing hole.

The movable contact piece may have a dimension in the direction parallel to the extension direction in the portion where the first movable contact is arranged, which is equal to or smaller than the diameter of the first movable contact. In this case, the arc can be quickly moved to the back side of the movable contact piece.

The movable contact piece may include a corner portion on the side opposite to the side on which the first movable contact is arranged and through which an arc passes. The corner portion may have an R shape. In this case, the arc can be quickly moved to the back side of the movable contact piece.

According to the present invention, in an electromagnetic relay, an arc can be extended in the space behind the movable contact piece.

It is a perspective view of an electromagnetic relay. It is a perspective view of the electromagnetic relay with a cover removed. It is the figure which looked at the electromagnetic relay with the cover removed from the front. It is a perspective view of a part of a contact device and a magnet part. It is a figure which saw a part of a contact device and a magnet part from the right. It is a figure which looked at the 1st fixed terminal and a movable contact piece from the front. It is a figure which looked at the 1st fixed terminal and a movable contact piece from the front. It is a figure which looked at the 1st fixed terminal and a movable contact piece which concerns on a modification from the front. It is a perspective view of the 1st fixed terminal which concerns on a modification. It is a perspective view of the 1st fixed terminal which concerns on a modification. It is a perspective view of the 1st fixed terminal which concerns on a modification. It is a perspective view of the 1st fixed terminal which concerns on a modification. It is the figure which looked at the movable contact piece which concerns on a modification from below. It is a perspective view of the movable contact piece which concerns on a modification.

Hereinafter, embodiments of an electromagnetic relay according to one aspect of the present invention will be described with reference to the drawings. In each drawing, the direction indicated by Z2 is upward, the direction indicated by Z1 is downward, the direction indicated by X1 is left, the direction indicated by X2 is right, the direction indicated by Y1 is forward, and the direction indicated by Y2 is rear. Explained as a direction. It should be noted that these directions are defined for convenience of explanation, and do not limit the arrangement direction of the electromagnetic relay.

As shown in FIGS. 1 to 3, the electromagnetic relay 1 includes a case 2, a contact device 3, a drive device 4, and a magnet portion 5. In addition, in FIGS. 2 and 3, the magnet portion 5 is not shown in order to make the drawings easier to see. The case 2 is made of an insulating material such as resin. The case 2 is formed in a box shape. Case 2 includes a base 2a and a cover 2b. The base 2a supports the contact device 3 and the drive device 4. The cover 2b is attached to the base 2a so as to cover the base 2a from above. The contact device 3 and the drive device 4 are housed in the case 2.

FIG. 4 is a perspective view of a part of the contact device 3 and the magnet portion 5. FIG. 5 is a view of a part of the contact device 3 and the magnet portion 5 as viewed from the front. As shown in FIGS. 2 to 5, the contact device 3 includes a first fixed terminal 6, a second fixed terminal 7, a movable contact piece 8, a movable member 9, and a contact spring 10.

The first fixed terminal 6 is a plate-shaped terminal and is made of a conductive material such as copper. The first fixed terminal 6 is fixed to the base 2a. The first fixed terminal 6 includes a contact support portion 11, a first fixed contact 12, a terminal extension portion 13, a terminal extension portion 14, and a supported portion 15.

The contact support portion 11 extends in the front-rear direction and the left-right direction. The contact support portion 11 overlaps with the movable contact piece 8 when viewed from the vertical direction. The first fixed contact 12 is supported by the contact support portion 11. The first fixed contact 12 projects upward from the contact support portion 11. The first fixed contact 12 may be integrated with the first fixed terminal 6.

FIG. 6 is a view of the first fixed terminal 6 and the movable contact piece 8 as viewed from the front. The terminal extension portions 13 and 14 are continuously formed on the contact support portion 11. The terminal extension portion 13 is connected to the left end of the contact support portion 11. The terminal extension portion 14 is connected to the right end of the contact support portion 11. The terminal extension portions 13 and 14 do not overlap with the movable contact piece 8 when viewed from the first direction. The first direction in this embodiment is the vertical direction.

The terminal extension portion 13 includes a first extension portion 13a and a second extension portion 13b. The first stretched portion 13a extends to the left from the left end of the contact support portion 11. The first stretched portion 13a extends in the front-rear direction and the left-right direction. The second stretched portion 13b is connected to the first stretched portion 13a. The second stretched portion 13b extends in the vertical direction. The second stretched portion 13b is bent upward from the first stretched portion 13a. The second stretched portion 13b has a tapered shape in which the dimension in the second direction gradually decreases. The second direction is a direction orthogonal to the first direction. The second direction in the present embodiment is the front-back direction. The second stretched portion 13b is formed so that the dimension in the front-rear direction becomes smaller as it extends upward.

The terminal extension portion 14 includes a first stretched portion 14a and a second stretched portion 14b. Since the terminal extension portion 14 has a symmetrical shape with the terminal extension portion 13 with the first fixed contact 12 interposed therebetween, detailed description thereof will be omitted.

The supported portion 15 has a substantially U-shape when viewed from the front-rear direction. The supported portion 15 is fixed to the contact support portion 11 on the lower side of the contact support portion 11. The supported portion 15 is supported by the base 2a. The supported portion 15 includes a pair of external connecting portions 15a. A pair of external connection portions 15a are formed at both ends of the supported portion 15. A pair of external connection portions 15a project downward from the base 2a and are electrically connected to an external device (not shown).

The second fixed terminal 7 is a plate-shaped terminal and is made of a conductive material such as copper. The second fixed terminal 7 is arranged apart from the first fixed terminal 6 in the front-rear direction. In the present embodiment, the second fixed terminal 7 is arranged behind the first fixed terminal 6.

The second fixed terminal 7 has the same shape as the first fixed terminal 6. The second fixed terminal 7 includes a contact support portion 21, a second fixed contact 22, a terminal extension portion 23, a terminal extension portion 24, and a supported portion 25. The terminal extension portion 23 includes a first stretch portion 23a and a second stretch portion 23b. The terminal extension portion 24 includes a first stretched portion 24a and a second stretched portion 24b. The supported portion 25 includes a pair of external connecting portions 25a. Since each configuration of the second fixed terminal 7 is the same as each configuration of the first fixed terminal 6, the description thereof will be omitted.

The movable contact piece 8 is a plate-shaped terminal and is made of a conductive material such as copper. The movable contact piece 8 extends in the front-rear direction. The movable contact piece 8 is fixed to the movable member 9. The movable contact piece 8 is arranged above the first fixed terminal 6 and the second fixed terminal 7.

The movable contact piece 8 includes a first movable contact 8a and a second movable contact 8b. The first movable contact 8a is arranged so as to face the first fixed contact 12, and is in contact with the first fixed contact 12. The second movable contact 8b is arranged so as to face the second fixed contact 22, and is in contact with the second fixed contact 22. The first movable contact 8a and the second movable contact 8b may be integrated with the movable contact piece 8.

The movable contact piece 8 is movable in the first direction. The first direction includes a contact direction in which the first movable contact 8a approaches the first fixed contact 12, and an opening direction in which the first movable contact 8a is separated from the first fixed contact 12. In the present embodiment, the contact direction is the direction indicated by Z1 (downward direction), and the opening direction is the direction indicated by Z2 (upward direction).

The movable contact piece 8 is movable between the open position shown in FIG. 6 and the closed position shown in FIG. 7. When the movable contact piece 8 is in the open position, the first movable contact 8a is separated from the first fixed contact 12, and the second movable contact 8b is separated from the second fixed contact 22. When the movable contact piece 8 is in the closed position, the first movable contact 8a contacts the first fixed contact 12, and the second movable contact 8b contacts the second fixed contact 22.

The movable member 9 extends in the vertical direction. The movable member 9 is connected to the movable contact piece 8 between the first movable contact 8a and the second movable contact 8b. The movable member 9 is arranged at the center of the movable contact piece 8 in the front-rear direction. The movable member 9 is made of an insulating material such as resin.

The movable member 9 includes a first member 31 and a second member 32. The movable contact piece 8 is fixed to the first member 31, and the first member 31 moves in the vertical direction integrally with the movable contact piece 8. Specifically, as shown in FIG. 3, the movable contact piece 8 is fixed to the first member 31 by the bush 34 inserted into the first member 31.

The vertical movement of the first member 31 is guided by a guide portion (not shown) formed on the base 2a. The guide portion is formed so as to be recessed downward on the upper surface of the base 2a, and is formed in a non-circular shape when viewed from above. The guide portion limits the movement of the first member 31 in the left-right direction and the front-back direction. The first member 9a includes a sliding portion 31a guided by the guide portion. The sliding portion 31a is formed at the lower end of the first member 31, and has a shape that follows the shape of the guide portion. The first member 31 is restricted from rotating about an axis parallel to the vertical direction by a guide portion.

The second member 32 is arranged above the first member 31. The second member 32 is connected to a movable iron piece 4e, which will be described later. The second member 32 is prevented from coming off from the first member 31 by engaging the lower end portion 32a with a keyhole-shaped locking hole (not shown) formed in the first member 31. The second member 32 can move relative to the first member 31 in the vertical direction.

The contact spring 10 is a coil spring and is arranged between the first member 31 and the second member 32 in a compressed state. The contact spring 10 is provided to increase the contact pressure of the first movable contact 8a with respect to the first fixed contact 12 and the contact pressure of the second movable contact 8b with respect to the second fixed contact 22. The contact spring 10 urges the second member 32 toward the opening direction.

The drive device 4 is arranged on the left side of the contact device 3. The drive device 4 moves the movable contact piece 8 in the vertical direction via the movable member 9. The drive device 4 includes a coil 4a, a spool 4b, a fixed iron core 4c, a yoke 4d, a movable iron piece 4e, and a hinge spring 4f.

The coil 4a is wound around the outer circumference of the spool 4b. The spool 4b extends in the vertical direction. The fixed iron core 4c is arranged on the inner peripheral portion of the spool 4b. In the present embodiment, the fixed iron core 4c is formed by laminating a plurality of plate materials. The yoke 4d is arranged so as to cover the left side of the coil 4a. The yoke 4d is substantially L-shaped when viewed from the front-rear direction. The yoke 4d is connected to the lower end of the fixed iron core 4c.

The left end of the movable iron piece 4e is rotatably supported by the yoke 4d via the hinge spring 4f. The movable iron piece 4e rotates with the upper end of the yoke 4d as a fulcrum. The right end of the movable iron piece 4e is connected to the second member 32 of the movable member 9. The movable iron piece 4e is arranged above the fixed iron core 4c. The hinge spring 4f urges the movable iron piece 4e in a direction away from the fixed iron core 4c. The hinge spring 4f has a substantially L-shape when viewed from the front-rear direction, and is attached to the yoke 4d and the movable iron piece 4e.

The magnet portion 5 applies a magnetic field for extending an arc generated between the first fixed contact 12 and the first movable contact 8a and an arc generated between the second fixed contact 22 and the second movable contact 8b. Generate in the second direction (front-back direction). The magnet portion 5 is arranged around the case 2.

The magnet portion 5 includes a first magnet 5a, a second magnet 5b, and a yoke 5c. The first magnet 5a and the second magnet 5b are permanent magnets. The first magnet 5a is arranged on the front surface of the cover 2b. The first magnet 5a is arranged in front of the contact device 3. The second magnet 5b is arranged on the rear surface of the cover 2b. The second magnet 5b is arranged behind the contact device 3. The second magnet 5b is arranged so that different poles face each other in the front-rear direction with the first magnet 5a. In the present embodiment, the S pole of the first magnet 5a is arranged facing the front surface of the cover 2b, and the N pole of the second magnet 5b is arranged facing the rear surface of the cover 2b. Therefore, a magnetic flux flows between the first magnet 5a and the second magnet 5b from the second magnet 5b toward the first magnet 5a. As shown in FIG. 1, the yoke 5c has a substantially U-shape when viewed from the left-right direction, and is attached to the cover 2b. The yoke 5c is connected to the first magnet 5a and the second magnet 5b so as to cover the outside of the first magnet 5a and the second magnet 5b.

Next, the operation of the electromagnetic relay 1 will be described. In a state where no voltage is applied to the coil 4a, the movable member 9 is pressed in the opening direction by the elastic force of the hinge spring 4f, and the movable contact piece 8 is located at the opening position. When a voltage is applied to the coil 4a and the drive device 4 is excited, the movable iron piece 4e is attracted to the fixed iron core 4c and rotates, and the movable member 9 is pressed in the contact direction. As a result, the movable member 9 moves in the contact direction against the elastic force of the hinge spring 4f. As the movable member 9 moves in the contact direction, the movable contact piece 8 moves to the closed position. As a result, the first movable contact 8a comes into contact with the first fixed contact 12, and the second movable contact 8b comes into contact with the second fixed contact 22. When the application of the voltage of the coil 4a is stopped, the movable member 9 moves in the opening direction by the elastic force of the hinge spring 4f, and the movable contact piece 8 returns to the open position.

When the first movable contact 8a is released from the state of being in contact with the first fixed contact 12, an arc is generated between the first movable contact 8a and the first fixed contact 12. Hereinafter, the arc generated between the first movable contact 8a and the first fixed contact 12 is referred to as a first arc. For example, when a current flows from the first movable contact 8a to the first fixed contact 12, as shown in FIG. 6, the extension direction in which the first arc is extended is the direction of the Lorentz force F1 acting on the first arc. Is the direction indicated by X2 (left direction).

Here, the first extension portion 13a of the terminal extension portion 13 extends in the extension direction (direction of the Lorentz force F1) in which the first arc is extended. Further, the second stretched portion 13b is bent in the opening direction from the first stretched portion 13a. Therefore, as shown in FIG. 6, when the Lorentz force F1 acts on the first arc, the end portion of the first arc that moves the first fixed terminal 6 moves to the first stretching portion 13a and then the second stretching portion. It is guided in the opening direction by the portion 13b. As a result, when the end of the first arc moves to the upper end of the second stretching portion 13b, the Lorentz force F2 in the opening direction acts on the first arc. As a result, the first arc can be extended in the space on the back side (upper side) of the movable contact piece 8. Further, the second stretching portion 13b can prevent the first arc from hitting the inner side surface of the cover 2b located in the extending direction in which the first arc is stretched. As a result, it is possible to prevent the inner surface of the cover 2b from being deteriorated by the first arc. In the present embodiment, in the case 2, a space for extending the arc is provided on the back side where the first movable contact 8a of the movable contact piece 8 is arranged and the back side where the second movable contact 8b is arranged.

A Lorentz force (to the right) in the direction opposite to the Lorentz force F1 acts on the arc generated between the second movable contact 8b and the second fixed contact 22. In this case, the arc generated between the second movable contact 8b and the second fixed contact 22 is guided by the terminal extension portion 24 of the second fixed terminal 7. On the other hand, when a current flows from the first movable contact 8a to the first fixed contact 12, the Lorentz force (to the right) in the direction opposite to the Lorentz force F1 acts on the first arc, so that the first arc is the first. 1 Guided by the terminal extension portion 14 of the fixed terminal 6. Similarly, the arc generated between the second movable contact 8b and the second fixed contact 22 is guided by the terminal extension portion 23 of the second fixed terminal 7.

Here, the movable contact piece 8 may further include a step portion 81. The step 81 restricts the end of the first arc that moves the movable contact piece 8 from moving toward the center of the movable contact piece 8 in the front-rear direction. The step portion 81 is arranged between the first movable contact 8a and the movable member 9. As shown in FIG. 6, the step portion 81 is formed so as to project from the left side portion of the movable contact piece 8 in the direction (left direction) of the Lorentz force F1 acting on the first arc. The step portion 81 may be composed of a recess recessed from the left side portion of the movable contact piece 8 to the right. Further, in the present embodiment, the configuration similar to that of the stepped portion 81 is such that the right side portion between the first movable contact 8a and the movable member 9 and the second movable contact 8b and the movable member 9 in the movable contact piece 8. It is also formed on the left and right sides of the space.

Although the embodiment of the electromagnetic relay according to one aspect of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention. For example, the configuration of the case 2, the contact device 3, the drive device 4, or the magnet unit 5 may be changed.

Each of FIGS. 8 to 12 shows a modification of the first fixed terminal 6. The modified example of the first fixed terminal 6 shown in FIGS. 8 to 12 may be applied to the second fixed terminal 7. As shown in FIG. 8, the second extending portion 13b of the terminal extension portion 13 may protrude in the contact direction (upward) from the movable contact piece 8 when the movable contact piece 8 is in the open position. Alternatively, the second extending portion 13b of the terminal extension portion 13 may be at the same distance from the contact support portion 11 as the movable contact piece 8 when the movable contact piece 8 is in the open position.

As shown in FIG. 9, the terminal extension portion 13 of the first fixed terminal 6 may further include a gas vent hole 13c for suppressing the retention of hot gas. The degassing hole 13c is a through hole. The degassing hole 13c may be formed at the boundary between the first stretched portion 13a and the second stretched portion 13b, or may be formed in the second stretched portion 13b as shown in FIG. Alternatively, the degassing hole 13c may be formed over the first stretched portion 13a and the second stretched portion 13b. Similarly, the terminal extension portion 14 of the first fixed terminal 6 may further include a degassing hole 13c.

As shown in FIG. 11, the first fixed terminal 6 may be composed of a single member. That is, the contact support portion 11, the terminal extension portions 13, 14 and the supported portion 15 may be integrated. Even in this case, as shown in FIG. 12, the second stretched portions 13b and 14b may have a tapered shape in which the dimensions in the second direction gradually decrease.

FIG. 13 shows a modified example of the movable contact piece 8. As shown in FIG. 13, in the movable contact piece 8, the dimension S1 in the third direction of the portion where the first movable contact 8a is arranged may be equal to or smaller than the diameter of the first movable contact 8a. The third direction is a direction orthogonal to the first direction and the second direction, and corresponds to the left-right direction here. FIG. 13 shows an example in which the dimension S1 in the third direction of the portion where the first movable contact 8a is arranged is slightly smaller than the diameter of the first movable contact 8a. The size of the portion where the second movable contact 8b is arranged may be smaller than or equal to the diameter of the second movable contact 8b. Further, in this case, as shown in FIG. 14, in the movable contact piece 8, at least the corner portion 8c on the back surface side (Z1 side) of the movable contact piece 8 through which the end of the arc passes has an R shape. May be good.

1 Electromagnetic relay 4 Drive device 5 Magnet part 6 1st fixed terminal 8 Movable contact piece 8a 1st movable contact 8b 2nd movable contact 8c Square part 13, 14 Terminal extension part 13a, 13b 1st extension part 13b, 14b 2nd extension Part 13c, 14c Degassing hole 81 step part

Claims (8)

The first fixed terminal including the first fixed contact,
A contact direction in which the first movable contact approaches the first fixed contact and an opening direction in which the first movable contact is separated from the first fixed contact, including a first movable contact facing the first fixed contact. With a movable contact piece that can move in the first direction, including
A drive device for moving the movable contact piece in the first direction,
A magnet portion that generates a magnetic field for extending an arc generated between the first fixed contact and the first movable contact in a second direction orthogonal to the first direction, and a magnet portion.
Equipped with
The first fixed terminal includes a terminal extension portion that does not overlap with the movable contact piece when viewed from the first direction.
The terminal extension portion of the first fixed terminal has a first extension portion extending in an extension direction in which the arc is extended when viewed from the second direction, and a second extension portion bent in the opening direction from the first extension portion. Including the stretched part,
Electromagnetic relay. The second stretched portion has a tapered shape in which the dimension in the second direction gradually decreases.
The electromagnetic relay according to claim 1. The movable contact piece is movable between a closed position where the first movable contact contacts the first fixed contact and an open position where the first movable contact is separated from the first fixed contact.
The second stretched portion protrudes in the contact direction from the movable contact piece when the movable contact piece is in the open position.
The electromagnetic relay according to claim 1 or 2. A second fixed terminal including a second fixed contact arranged away from the first fixed contact in the first direction and a third direction orthogonal to the second direction is further provided.
The movable contact piece further includes a second movable contact facing the second fixed contact and a step portion that restricts the arc from moving toward the center of the movable contact piece in the third direction. ,
The electromagnetic relay according to any one of claims 1 to 3. The terminal extension portion of the first fixed terminal further includes a gas vent hole formed at a boundary between the first extension portion and the second extension portion.
The electromagnetic relay according to any one of claims 1 to 4. The terminal extension portion of the first fixed terminal further includes a gas vent hole formed in the second extension portion.
The electromagnetic relay according to any one of claims 1 to 4. The movable contact piece has a dimension in a direction parallel to the extension direction in a portion where the first movable contact is arranged, which is equal to or smaller than the diameter of the first movable contact.
The electromagnetic relay according to any one of claims 1 to 6. The movable contact piece includes a corner portion on the side opposite to the side on which the first movable contact is arranged and through which the arc passes.
The corner portion has an R shape.
The electromagnetic relay according to claim 7.

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