WO2016129144A1

WO2016129144A1 - Relay

Info

Publication number: WO2016129144A1
Application number: PCT/JP2015/078072
Authority: WO
Inventors: 和也早田; 信也山本; 哲夫新開; 大甫岡崎; 村上　和也; 和宏池本; 晴加帆足
Original assignee: オムロン株式会社
Priority date: 2015-02-11
Filing date: 2015-10-02
Publication date: 2016-08-18
Also published as: JP2016149231A; JP6649680B2; DE112015006144T5; CN107210160B; CN107210160A

Abstract

A pressing member is provided so as to press against a portion of a first contact piece between a first terminal and a first contact point. The pressing member moves from an off position to an on position, and presses the first contact piece toward a second contact piece, whereby the first contact point contacts a second contact point. When the pressing of the pressing member is stopped, the first contact point and the second contact point lose contact due to the elastic force of the first contact piece, and the pressing member is pushed back by the first contact piece, moving from the on position to the off position. Before the pressing member reaches the off position from the on position, the movement of the first contact piece is restricted by a restricting member.

Description

relay

The present invention relates to a relay.

Some relays open and close contacts by operating a pressing member with a drive unit such as an electromagnet. For example, in the electromagnetic relay of Patent Document 1, the pressing member presses the movable contact piece toward the fixed contact piece when the electromagnet is excited. Thereby, the movable contact provided in the movable contact piece contacts the fixed contact provided in the fixed contact piece. Moreover, the pressing member is pushed back by the elastic force of the movable contact piece by demagnetizing the electromagnet. Thereby, the movable contact is separated from the fixed contact.

JP 2001-143593 A

In order to increase the amount of movement of the contact while minimizing the amount of movement of the pressing member, the pressing member has a portion between the contact provided on the movable part and the terminal provided on the fixed part in the contact piece. It is preferable to press.
On the other hand, in the above-described relay, when the movable contact moves away from the fixed contact, the temperature may increase instantaneously due to an arc flowing between the contacts. In that case, the pressing member in contact with the movable contact piece is affected by heat. In particular, the portion between the contact and the terminal that becomes the energization region in the contact piece is likely to become high temperature. Therefore, when the pressing member presses a portion between the contact and the terminal in the contact piece, there is a possibility that the pressing member may be damaged due to high temperature when an arc is generated.

An object of the present invention is to provide a relay that can suppress damage caused by heat of a pressing member due to an arc flowing between the contacts while increasing the amount of movement of the contacts.

The relay according to an aspect of the present invention includes a first contact portion, a second contact portion, a pressing member, a driving portion, and a regulating member. The first contact portion includes a first contact piece, a first terminal connected to the first contact piece, and a first contact attached to the first contact piece. The second contact portion includes a second contact piece, a second terminal connected to the second contact piece, and a second contact attached to the second contact piece. The pressing member is provided to be movable between an on position and an off position. The ON position is a position where the pressing member presses the first contact piece to bring the first contact into contact with the second contact. The off position is a position in which the first contact and the second contact are not in contact with each other, and further moved in a direction to separate the first contact and the second contact. The drive unit operates the pressing member. The restricting member restricts the movement of the first contact piece.

The pressing member is provided so as to press a portion between the first terminal and the first contact in the first contact piece. When the pressing member moves from the off position to the on position and presses the first contact piece in the direction toward the second contact piece, the first contact contacts the second contact. When the pressing by the pressing member stops, the first contact and the second contact are brought into non-contact by the elastic force of the first contact piece, and the pressing member is pushed back by the first contact piece to change from the on position to the off position. Moving. Before the pressing member reaches the off position from the on position, the movement of the first contact piece is regulated by the regulating member.

In the relay according to this aspect, the pressing member is pushed back by the elastic force of the first contact piece, thereby returning from the on position to the off position. At that time, the movement of the first contact piece is restricted by the restricting member before the pressing member reaches the off position from the on position. Thereby, only a press member moves further toward an OFF position, and a press member leaves | separates from a 1st contact piece. For this reason, the pressing member can be quickly separated from the first contact piece. Thereby, the time which the press member is contacting with the 1st contact piece can be shortened. Therefore, even if an arc flows between the contacts, damage to the pressing member due to heat can be suppressed.

The restricting member may restrict the movement of the first contact piece before the first contact piece returns to the natural position.
The regulating member may regulate the movement of the first contact piece by contacting the first contact portion at the position where the first contact is provided.
The regulating member may regulate the movement of the first contact piece by contacting the first contact portion at a position opposite to the first terminal from the position where the first contact is provided.

The regulating member may regulate the movement of the first contact piece by contacting the first contact portion at a position between the first contact and the first terminal.
The restricting member may have a dummy terminal configured not to be energized.
The relay may further include a base that supports the first contact portion. The restricting member may be provided on the base.

The relay may further include a base that supports the first contact portion and a case that covers the base. The restricting member may be provided on the case.
The pressing member may be made of resin.

According to the present invention, it is possible to provide a relay that can suppress damage due to heat of the pressing member due to an arc flowing between the contacts while increasing the amount of movement of the contacts.

It is a perspective view of the relay concerning a 1st embodiment. It is a perspective view of a relay. It is an exploded view of a relay. It is a side view of a relay. It is an enlarged view of the vicinity of a pressing member and each terminal part. It is an enlarged view of the vicinity of a pressing member and each terminal part. It is an enlarged view of the vicinity of a pressing member and each terminal part. The figure which shows the natural position of a 1st contact piece. It is a perspective view of the relay which concerns on 2nd Embodiment. It is a perspective view of the relay which concerns on the 1st modification of 2nd Embodiment. It is a perspective view of the relay which concerns on the 2nd modification of 2nd Embodiment. It is sectional drawing of the relay which concerns on 3rd Embodiment.

Hereinafter, a relay according to an embodiment will be described with reference to the drawings. In the following description, the upper, lower, left, and right directions are used for convenience of explanation, and mean the direction when the relay is viewed in a certain state, and do not limit the mounting direction of the relay. Absent.
1 and 2 are perspective views of the relay 1 according to the first embodiment. FIG. 3 is an exploded view of the relay 1. FIG. 4 is a side view of the relay 1. The relay 1 includes a first contact part 2, a second contact part 3, a drive part 4, a pressing member 5, a base 6, and a regulating member 7.

The first contact portion 2 is formed of a conductive material. As shown in FIGS. 3 and 4, the first contact portion 2 includes a first contact piece 21, a first terminal 22, a first contact 23, and a first fixing portion 24. The first contact piece 21 is supported by the base 6. The first contact piece 21 extends upward from the base 6. The first contact piece 21 has an elongated shape in the vertical direction. The first contact piece 21 is made of an elastic material. The first terminal 22 is connected to the first contact piece 21 via the first fixing portion 24.

The first terminal 22, the first fixing portion 24, and the first contact piece 21 may be integrally formed. Alternatively, the first terminal 22, the first fixing portion 24, and the first contact piece 21 may be separate from each other. The first fixing part 24 is fixed to the base 6. The first terminal 22 protrudes from the base 6. The first contact 23 is attached to the first contact piece 21.
The 2nd contact part 3 is formed with the material which has electroconductivity. The second contact portion 3 includes a second contact piece 31, a second terminal 32, a second contact 33, and a second fixing portion 34. The second contact piece 31 is supported by the base 6. The second contact piece 31 extends upward from the base 6. The second contact piece 31 has an elongated shape in the vertical direction. The second contact piece 31 is disposed to face the first contact piece 21. The second contact piece 31 is made of an elastic material.

The second terminal 32 is connected to the second contact piece 31 through the second fixing portion 34. The second terminal 32, the second fixing portion 34, and the second contact piece 31 may be integrally formed. Alternatively, the second terminal 32, the second fixing portion 34, and the second contact piece 31 may be separate from each other. The second fixing portion 34 is fixed to the base 6. The second terminal 32 protrudes from the base 6. The second contact 33 is attached to the second contact piece 31. The second contact 33 is disposed to face the first contact 23.

The driving unit 4 generates a driving force for operating the pressing member 5. Specifically, the drive unit 4 is an electromagnet and generates an electromagnetic force that operates the pressing member 5. The drive unit 4 includes a coil 41, a spool 42, an iron core 43, a yoke 44, and a movable iron piece 45. The coil 41 is wound around the spool 42. The axis of the coil 41 extends in the vertical direction. A coil terminal 47 is connected to the coil 41. An iron core 43 is inserted into the spool 42.

The yoke 44 has an L-shaped bent shape and is connected to the lower end portion of the iron core 43. Specifically, the yoke 44 has a yoke bottom 441 and a yoke side 442. The yoke bottom 441 is disposed below the coil 41. The yoke bottom 441 is connected to the lower end of the iron core 43. The yoke side portion 442 is arranged on the side of the coil 41. The yoke side portion 442 extends in the vertical direction.

The movable iron piece 45 is rotatably supported on the upper end portion of the yoke 44. Specifically, the movable iron piece 45 is rotatably supported on the upper end portion of the yoke side portion 442. The movable iron piece 45 is disposed above the iron core 43. The end of the movable iron piece 45 has a shape bent downward. The movable iron piece 45 has a tip portion 451 that protrudes downward. An elastic member 46 is attached to the movable iron piece 45 and the yoke 44. In this embodiment, the elastic member 46 is a leaf spring. The elastic member 46 urges the movable iron piece 45 in a direction in which the distal end portion 451 of the movable iron piece 45 is separated from the pressing member 5.

The pressing member 5 is driven by the driving unit 4. The pressing member 5 is rotatably supported by the base 6. The pressing member 5 presses the first contact piece 21 by being driven by the driving unit 4. The pressing member 5 is made of resin. However, the pressing member 5 may be formed of a material other than resin.
5 to 7 are enlarged views of the vicinity of the pressing member 5 and the first contact portion 2 and the second contact portion 3. The pressing member 5 is provided to be movable between an off position shown in FIG. 5 and an on position shown in FIG. As shown in FIG. 5, the off position is a position where the first contact 23 and the second contact 33 are not in contact with each other and the first contact 23 and the second contact 33 are moved away from each other. In the off position, the pressing member 5 is separated from the first contact piece 21. As shown in FIG. 7, in the on position, the pressing member 5 presses the first contact piece 21 to bring the first contact 23 into contact with the second contact 33.

As shown in FIG. 3, the pressing member 5 includes a main body portion 51, a rotating shaft portion 52, a receiving portion 53, and a pressing portion 54. The main body 51 has a plate shape. The main body 51 extends upward from the base 6. The rotation shaft portion 52 is provided at the bottom of the main body portion 51. The rotating shaft portion 52 is rotatably supported by the base 6. The receiving portion 53 protrudes in a direction from the main body portion 51 toward the movable iron piece 45. The distal end of the receiving portion 53 faces the distal end portion 451 of the movable iron piece 45.

The pressing part 54 protrudes in a direction from the main body part 51 toward the first contact piece 21. The pressing part 54 is located below the upper end of the main body part 51. The tip of the pressing part 54 faces the first contact piece 21. As will be described later, the pressing portion 54 is provided so as to press a portion of the first contact piece 21 between the first terminal 22 and the first contact 23. Specifically, the pressing portion 54 is provided so as to press a portion between the first contact 23 and the first fixing portion 24 in the first contact piece 21.

The base 6 supports the drive unit 4, the pressing member 5, the first contact unit 2, the second contact unit 3, and the regulating member 7. The base 6 is covered with a case 8 (see FIG. 12). The base 6 and the case 8 are made of resin, for example, but may be formed of a material other than resin.
The base 6 has a first wall portion 61. The first wall portion 61 extends in the vertical direction. The first wall portion 61 is disposed between the movable iron piece 45 and the yoke 44. The base 6 has a second wall portion 62. The second wall portion 62 extends in the up-down direction. The second wall portion 62 is disposed between the main body portion 51 of the pressing member 5 and the movable iron piece 45. The receiving portion 53 extends toward the tip end portion 451 of the movable iron piece 45 beyond the second wall portion 62. The base 6 has a third wall portion 63. The third wall portion 63 extends in the vertical direction. The third wall 63 is disposed on the side of the pressing member 5 and the first contact piece 21.

The base 6 has a shaft support portion 64. The shaft support portion 64 has a shape recessed in an arc shape. The shaft support portion 64 rotatably supports the rotation shaft portion 52 of the pressing member 5. The base 6 has a first contact support portion 65. The first contact support portion 65 has a groove shape. The first fixing portion 24 is fitted into the first contact support portion 65. As a result, the first contact portion 2 is fixed to the base 6. The base 6 has a second contact support portion 66. The second contact support portion 66 has a groove shape. The second fixing portion 34 is fitted into the second contact support portion 66. As a result, the second contact portion 3 is fixed to the base 6.

As shown in FIG. 2, the base 6 has a regulating member support portion 67. The restricting member support portion 67 has a groove shape. A fixing portion 73 of the regulating member 7 described later is fitted into the regulating member support portion 67. Thereby, the regulating member 7 is fixed to the base 6.
The regulating member 7 is supported by the base 6. The restriction member 7 restricts the movement of the first contact piece 21 when the first contact piece 21 pushes the first contact piece 21 back from the on position to the off position. In the present embodiment, the restricting member 7 is a dummy terminal configured not to be energized. That is, the restricting member 7 has a shape similar to that of a contact portion constituting a so-called b contact.

As shown in FIG. 3, the regulating member 7 has a support part 71 and a contact part 72. The restricting member 7 has a fixing portion 73 connected to the support portion 71. The support part 71, the contact part 72, and the fixing part 73 are integrally formed. However, the support part 71, the contact part 72, and the fixing part 73 may be separate from each other.
The fixing part 73 is fixed to the base 6 as described above. The support part 71 has the same shape as the contact piece. The contact part 72 has the same shape as the contact. That is, the contact portion 72 has a shape protruding from the support portion 71. However, the regulating member 7 is not provided with a portion corresponding to the terminal. Further, no contact is attached to the regulating member 7, and the contact portion 72 is formed on the support portion 71 by press working or the like.

The support portion 71 has a shape bent in an L shape. Specifically, the support part 71 includes a first support part 711 and a second support part 712. The first support portion 711 extends upward from the base 6. The fixed portion 73 is connected to the first support portion 711. The second support part 712 extends laterally from the upper end of the first support part 711. The second support portion 712 extends from the upper end of the first support portion 711 toward a position facing the first contact piece 21. A third wall portion 63 is disposed between the first support portion 711 and the first contact piece 21.

The second support part 712 extends from the upper end of the first support part 711 to the position facing the first contact piece 21 over the third wall part 63. The second support part 712 is disposed above the pressing part 54. Therefore, the regulating member 7 is disposed so as not to interfere with the movement range of the pressing member 5. The contact part 72 is provided on the second support part 712. The contact portion 72 faces the position where the first contact 23 is provided in the first contact piece 21. As shown in FIG. 6, when the contact portion 72 contacts the first contact portion 2, the restricting member 7 restricts the movement of the first contact piece 21.

The regulating member 7 regulates the movement of the first contact piece 21 by contacting the first contact portion 2 at the position where the first contact 23 is provided. In a state where the regulating member 7 is in contact with the first contact portion 2, the first contact piece 21 is pressed toward the second contact piece 31 rather than the natural position. In FIG. 8, the first contact piece 21 ′ indicated by a broken line indicates the natural position of the first contact piece 21.
Here, the natural position means the position of the first contact piece 21 in a state where the regulating member 7 is not provided and is not pressed by the pressing member 5. Therefore, when the load by the pressing member 5 is removed, the first contact piece 21 returns to the natural position if there is no restriction member 7. In other words, the regulating member 7 regulates the movement of the first contact piece 21 before the first contact piece 21 returns to the natural position when the load by the pressing member 5 is removed.

Next, the operation of the relay 1 according to this embodiment will be described.
When the coil 41 is not energized and the drive unit 4 is in a demagnetized state, the pressing member 5 is located at the off position, as shown in FIG. In this state, the pressing member 5 is not in contact with the first contact piece 21 and does not press the first contact piece 21. The first contact piece 21 is in contact with the regulating member 7, and the first contact 23 is not in contact with the second contact 33 (contact off state).

When the coil 41 is energized and the drive unit 4 is in an excited state, the movable iron piece 45 is attracted to the iron core 43 to rotate around the upper end of the yoke 44 (counterclockwise in FIG. 5). Thereby, the front-end | tip part 451 of the movable iron piece 45 presses the receiving part 53 of the press member 5, and the press member 5 rotates centering on the rotating shaft part 52 (clockwise rotation in FIG. 5). As the pressing member 5 rotates, the pressing portion 54 moves toward the first contact piece 21 and contacts the first contact piece 21 as shown in FIG. 6. When the pressing member 5 further rotates, the pressing portion 54 presses the first contact piece 21 toward the second contact piece 31. Thereby, the 1st contact piece 21 leaves | separates from the control member 7, and as shown in FIG. 7, the press member 5 moves to an ON position, and the 1st contact 23 contacts the 2nd contact 33 (contact ON state). . As described above, when the pressing member 5 moves from the off position to the on position and presses the first contact piece 21 in the direction toward the second contact piece 31, the first contact 23 becomes the second contact 33. Contact.

Conversely, in the contact-on state shown in FIG. 7, when the energization of the coil 41 is stopped and the drive unit 4 is demagnetized, the pressing by the pressing member 5 is stopped. Then, the movable iron piece 45 is rotated in a direction in which the distal end portion 451 of the movable iron piece 45 is separated from the pressing member 5 by the elastic force of the elastic member 46 (clockwise in FIG. 7). When the tip 451 of the movable iron piece 45 is separated from the pressing member 5, the pressing member 5 is pushed back by the elastic force of the first contact piece 21 to return to the natural position, and rotates from the on position toward the off position (see FIG. 7 counterclockwise). Thereby, as shown in FIG. 6, the first contact 23 is not in contact with the second contact 33.

At this time, the first contact piece 21 pushes back the pressing member 5 while being in contact with the pressing member 5 to a position where it comes into contact with the regulating member 7. The first contact piece 21 stops moving by contacting the regulating member 7 before the pressing member 5 reaches the off position from the on position. That is, the movement of the first contact piece 21 in the direction in which the pressing member 5 is pushed back is regulated by the regulating member 7 before returning to the natural position. Therefore, as shown in FIG. 5, the pressing member 5 moves away from the first contact piece 21 to the off position.

In the relay 1 according to the present embodiment described above, when the contact is switched from the contact-on state to the contact-off state, the first contact piece 21 is pressed before returning to the natural position (first contact piece 21 ′ in FIG. 8). The member 5 is separated from the first contact piece 21. For this reason, compared with the case where the press member 5 leaves | separates from the 1st contact piece 21 when the 1st contact piece 21 returns to a natural position, the press member 5 can be moved away from the 1st contact piece 21 rapidly. Thereby, the time for which the pressing member 5 is in contact with the first contact piece 21 can be shortened. Therefore, even if an arc flows between the contacts, damage to the pressing member 5 due to heat can be suppressed.

Next, the relay 1 according to the second embodiment will be described. FIG. 9 is a perspective view of the relay 1 according to the second embodiment. In the relay 1 according to the second embodiment, the regulating member 7 is provided on the base 6. The regulating member 7 is formed integrally with the base 6. Alternatively, the regulating member 7 may be a separate body from the base 6.
Specifically, the restriction member 7 includes a first support portion 711, a second support portion 712, and a contact portion 72. The first support portion 711 extends upward from the third wall portion 63. The second support part 712 extends laterally from the upper end of the first support part 711. The contact portion 72 faces the position where the first contact 23 is provided in the first contact piece 21. When the contact portion 72 contacts the first contact piece 21 at the position where the first contact 23 is provided, the regulating member 7 regulates the movement of the first contact piece 21.

Also in the relay 1 according to the present embodiment, the pressing member 5 can be quickly separated from the first contact piece 21 as in the relay 1 according to the first embodiment. Thereby, the time for which the pressing member 5 is in contact with the first contact piece 21 can be shortened. Therefore, even if an arc flows between the contacts, damage to the pressing member 5 due to heat can be suppressed.
FIG. 10 is a perspective view of the relay 1 according to a first modification of the second embodiment. As shown in FIG. 10, the regulating member 7 comes into contact with the first contact piece 21 at a position opposite to the first terminal 22 from the position where the first contact 23 is provided in the first contact piece 21. The movement of the first contact piece 21 may be restricted. That is, even if the regulating member 7 regulates the movement of the first contact piece 21 by contacting the first contact piece 21 at the tip side of the first contact piece 21 from the position where the first contact 23 is provided. Good. When an arc is generated between the contacts, a portion of the first contact piece 21 on the tip side of the position where the first contact 23 is provided is a portion where the first contact 23 is provided, or the first contact 23 and the first terminal. The temperature is lower than the portion between the two. For this reason, in the relay 1 which concerns on the 1st modification of 2nd Embodiment, the thermal influence to the control member 7 can be suppressed.

FIG. 11 is a perspective view of the relay 1 according to a second modification of the second embodiment. As shown in FIG. 11, the regulating member 7 regulates movement of the first contact piece 21 by contacting the first contact piece 21 at a position between the first contact 23 and the first terminal 22. Good.
Next, the relay 1 according to the third embodiment will be described. FIG. 12 is a perspective view of the relay 1 according to the third embodiment. In the relay 1 according to the third embodiment, the regulating member 7 is provided in the case 8. The regulating member 7 is formed integrally with the case 8. Alternatively, the regulating member 7 may be separate from the case 8. In the present embodiment, the restriction member 7 protrudes downward from the top surface of the case 8. The regulating member 7 regulates the movement of the first contact piece 21 by contacting the first contact piece 21 on the tip side of the first contact piece 21 from the position where the first contact 23 is provided.

Also in the relay 1 according to the present embodiment, the pressing member 5 can be quickly separated from the first contact piece 21 as in the relay 1 according to the first embodiment. Thereby, the time for which the pressing member 5 is in contact with the first contact piece 21 can be shortened. Therefore, even if an arc flows between the contacts, damage to the pressing member 5 due to heat can be suppressed.
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.

The structure of the 1st contact part 2, the 2nd contact part 3, the drive part 4, the press member 5, the base 6, or the control member 7 is not restricted to the thing of said embodiment, You may change.
The regulating member 7 as the dummy terminal according to the first embodiment is in contact with the first contact piece 21 at the tip side of the first contact piece 21 relative to the position where the first contact 23 is provided. The movement of 21 may be restricted. Alternatively, the restriction member 7 as a dummy terminal may restrict the movement of the first contact piece 21 by contacting the first contact piece 21 at a position between the first contact 23 and the first terminal 22. . The same applies to the case where the regulating member 7 is provided in the case 8 as in the third embodiment.

21 1st contact piece 22 1st terminal 23 1st contact 2 1st contact part 31 2nd contact piece 32 2nd terminal 33 2nd contact 3 2nd contact part 5 Pressing member 4 Drive part 7 Restriction member 6 Base 8 Case

Claims

A first contact portion having a first contact piece, a first terminal connected to the first contact piece, and a first contact attached to the first contact piece;
A second contact portion having a second contact piece, a second terminal connected to the second contact piece, and a second contact attached to the second contact piece;
The ON position, which is a position where the first contact piece is pressed to bring the first contact into contact with the second contact, the first contact and the second contact become non-contact, and further, the first contact and the A pressing member that is movably provided at an off position that is a position moved in a direction of separating the second contact;
A drive unit for operating the pressing member;
A regulating member that regulates the movement of the first contact piece;
With
The pressing member is provided to press a portion between the first terminal and the first contact in the first contact piece,
When the pressing member moves from the off position to the on position and presses the first contact piece in a direction toward the second contact piece, the first contact comes into contact with the second contact. When the pressing by the pressing member stops, the first contact and the second contact are not in contact with each other by the elastic force of the first contact piece, and the pressing member is pushed back to the first contact piece and the Move from the on position to the off position,
Before the pressing member reaches the off position from the on position, the movement of the first contact piece is regulated by the regulating member.
relay.
The restricting member restricts movement of the first contact piece before the first contact piece returns to a natural position;
The relay according to claim 1.
The restricting member restricts movement of the first contact piece by contacting the first contact portion at a position where the first contact is provided.
The relay according to claim 1 or 2.
The regulating member regulates the movement of the first contact piece by contacting the first contact portion at a position opposite to the first terminal from a position where the first contact is provided.
The relay according to claim 1 or 2.
The restricting member restricts movement of the first contact piece by contacting the first contact portion at a position between the first contact and the first terminal.
The relay according to claim 1 or 2.
The restricting member has a dummy terminal configured not to be energized,
The relay according to claim 1.
A base for supporting the first contact portion;
The regulating member is provided on the base;
The relay according to claim 1.
A base supporting the first contact portion;
A case that covers the base;
Further comprising
The regulating member is provided in the case;
The relay according to claim 1.
The pressing member is made of resin.
The relay according to claim 1.