electromagnetic relay

Abstract

To provide an electromagnetic relay which can effectively transmit biasing force of a contact spring to a movable contact piece if at least one of a fixed contact or a movable contact has been fused.SOLUTION: An electromagnetic relay comprises a first fixed terminal, a first fixed contact, a second fixed terminal, a second fixed contact, a movable contact piece, a first movable contact, a second movable contact, a contact spring, and a moving member. The movable contact piece includes a through-hole formed at the center in a first direction. The moving member is movable in a second direction. The moving member penetrates the through-hole and is coupled to the movable contact piece at its center in the first direction in a manner movable relative to the movable contact piece. The moving member has, between itself and the through-hole of the movable contact piece, a clearance which permits the movable contact piece to make direct or indirect contact with the second fixed terminal, with the movable contact piece inclined to the moving member by biasing force of the contact spring, if at least one of the second fixed contact or the second movable contact has been lost.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an electromagnetic relay. [Background technology]

[0002] Electromagnetic relays that open and close electric circuits have been known. The electromagnetic relay described in Patent Document 1 is a plunger-type electromagnetic relay that includes a pair of contact sections including a pair of fixed contacts and a pair of movable contacts, a movable contact piece, a drive shaft, and a contact spring. The pair of movable contacts are connected to the movable contact piece. The drive shaft passes through a through hole in the movable contact piece and is coupled to the movable contact piece so as to be relatively movable. The contact spring biases the movable contact piece in a direction that moves the pair of movable contacts toward the pair of fixed contacts. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-079109 Summary of the Invention [Problem to be solved by the invention]

[0004] When a large current such as a short-circuit current flows through a pair of contacts in an electromagnetic relay, one of the contacts may melt, causing at least one of the fixed contact and the moving contact to disappear. In this case, in order to maintain contact between the melted contacts, it is conceivable to tilt the moving contact piece using the biasing force of a contact spring.

[0005] However, in the electromagnetic relay of Patent Document 1, the gap between the through hole of the movable contact piece and the drive shaft is small, so there is a risk that the movable contact piece and the drive shaft will interfere with each other and the contact parts will not be able to maintain contact. Also, if the drive shaft is tilted together with the movable contact piece to maintain contact of the fused contact parts, the biasing force of the contact spring needs to be set even larger.

[0006] An object of the present invention is to provide an electromagnetic relay that can efficiently transmit the biasing force of the contact spring to the movable contact piece when at least one of the fixed contact and the movable contact melts. [Means for solving the problem]

[0007] An electromagnetic relay according to one aspect of the present invention includes a first fixed terminal, a first fixed contact, a second fixed terminal, a second fixed contact, a movable contact piece, a first movable contact, a second movable contact, a contact spring, and a movable member. The first fixed contact is connected to the first fixed terminal. The second fixed terminal is spaced apart from the first fixed terminal in a first direction. The second fixed contact is connected to the second fixed terminal. The movable contact piece includes a through hole formed at its center in the first direction. The first movable contact is connected to the movable contact piece and faces the first fixed contact in a second direction. The second direction includes a contact direction in which the first movable contact approaches the first fixed contact and a separation direction in which the first movable contact moves away from the first fixed contact. The second movable contact is connected to the movable contact piece and faces the second fixed contact in the second direction. The contact spring biases the movable contact piece in the contact direction. The movable member is movable in the second direction. The movable member passes through the through hole and is connected to the movable contact piece at the center of the movable contact piece in the first direction so as to be movable relative to the movable contact piece. The movable member has a clearance between itself and the through hole of the movable contact piece that allows the movable contact piece to come into direct or indirect contact with the second fixed terminal in a state inclined relative to the movable member due to the biasing force of the contact spring when at least one of the second fixed contact and the second movable contact is lost.

[0008] In this electromagnetic relay, when at least one of the fixed contact and the movable contact melts and the movable contact piece tilts relative to the movable member, the clearance between the through hole of the movable contact piece and the movable member can suppress interference between the movable contact piece and the movable member. As a result, an electromagnetic relay can be provided that can efficiently transmit the biasing force of the contact spring to the movable contact piece when at least one of the fixed contact and the movable contact piece melts. In addition, because the biasing force of the contact spring can be efficiently transmitted to the movable contact piece, it is possible to set the biasing force of the contact spring to be small.

[0009] The clearance of the movable member may be set so that the through hole of the movable contact piece does not interfere with the movable member when at least one of the second fixed contact and the second movable contact is lost and the movable contact piece comes into direct or indirect contact with the second fixed terminal in a state where it is tilted relative to the movable member. In this case, the biasing force of the contact spring can be set even smaller.

[0010] The movable member may be a shaft member extending parallel to the second direction and passing through the through hole. The clearance of the movable member may be set so that the movable member can maintain a state parallel to the second direction when at least one of the second fixed contact and the second movable contact is lost and the movable contact piece comes into direct or indirect contact with the second fixed terminal while tilted relative to the movable member. In this case, the biasing force of the contact spring can be set even smaller.

[0011] A part of the clearance of the movable member may be formed by a groove formed on the outer circumferential surface of the movable member. In this case, the clearance can be easily formed by the groove formed in the movable member.

[0012] The through hole of the movable contact piece may have a tapered shape so that the clearance between the movable contact piece and the moving member increases as the through hole extends in the contact direction. In this case, when at least one of the second fixed contact and the second moving contact is lost, the biasing force of the contact spring makes the movable contact piece more likely to tilt relative to the moving member.

[0013] The through hole of the movable contact piece may include a first edge in the contact direction. The first edge may have an R-chamfered or C-chamfered shape. In this case, interference between the first edge and the through hole can be suppressed when at least one of the second fixed contact and the second movable contact is lost. This makes it easier for the movable contact piece to tilt relative to the moving member due to the biasing force of the contact spring, even if the contact position of the contact is shifted.

[0014] The through hole of the movable contact piece may include a second edge portion in the separation direction. The second edge portion may have an R-chamfered or C-chamfered shape. In this case, interference between the second edge portion and the through hole can be suppressed when at least one of the second fixed contact and the second movable contact is lost. This makes it easier for the movable contact piece to tilt relative to the moving member due to the biasing force of the contact spring, even if the contact position of the contact is shifted.

[0015] The through hole of the movable contact piece may have an elliptical shape that is elongated in the first direction when viewed from the second direction, in which case, when at least one of the second fixed contact and the second movable contact is lost, the biasing force of the contact spring makes the movable contact piece more likely to tilt relative to the moving member.

[0016] The through hole of the movable contact piece may have a rectangular shape that is long in the first direction when viewed from the second direction. In this case, when at least one of the second fixed contact and the second movable contact is lost, the biasing force of the contact spring makes the movable contact piece more likely to tilt relative to the moving member.

[0017] The first fixed terminal may include a first contact support portion that supports the first fixed contact. The second fixed terminal may include a second contact support portion that supports the second fixed contact. The first contact support portion and the second contact support portion may extend parallel to the movable contact piece. In this case, a terminal structure that can suppress the electromagnetic repulsive force generated between the contacts is more likely to cause the second fixed contact and the second movable contact to melt than a terminal structure that cannot suppress the electromagnetic repulsive force, thereby enhancing the significance of the present invention.

[0018] According to the present invention, an electromagnetic relay can be provided in which the movable contact piece can maintain a state in which it is in direct or indirect contact with the fixed terminal even if at least one of the fixed contact and the movable contact is lost. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 2 is a cross-sectional schematic diagram of the electromagnetic relay when the electromagnetic relay is in an open state. [Figure 2]FIG. 2 is a schematic cross-sectional view of the electromagnetic relay when the electromagnetic relay is in a closed state. [Figure 3] 4 is a schematic cross-sectional view of the periphery of a movable contact piece when the electromagnetic relay is in a closed state. FIG. [Figure 4] 10 is a view showing a state in which the movable contact piece is in direct contact with the second fixed terminal. FIG. [Figure 5] 10 is a diagram showing a state in which the movable contact piece is in indirect contact with the second fixed terminal via the second fixed contact. FIG. [Figure 6] 10A and 10B are diagrams illustrating modified examples of the through hole of the movable contact piece. [Figure 7] 10A and 10B are diagrams illustrating modified examples of the through hole of the movable contact piece. [Figure 8] 10A and 10B are diagrams illustrating modified examples of the through hole of the movable contact piece. [Figure 9] FIG. 10 is a schematic diagram of a movable contact piece according to a modified example, viewed from above. [Figure 10] FIG. 10 is a schematic diagram of a movable contact piece according to a modified example, viewed from above. [Figure 11] 10A and 10B are diagrams for explaining modified examples of the drive shaft. [Figure 12] 10A and 10B are diagrams illustrating modified examples of the moving member. DETAILED DESCRIPTION OF THE INVENTION

[0020] An embodiment of an electromagnetic relay 100 according to one aspect of the present invention will be described below with reference to the drawings. For ease of understanding, when referring to the drawings, the upper side in FIG. 1 will be referred to as "up," the lower side as "down," the left side as "left," and the right side as "right." Specifically, in FIG. 1, the direction indicated by arrow Z will be referred to as the up-down direction, the direction indicated by arrow Z1 as the up direction, the direction indicated by arrow Z2 as the down direction, and the direction indicated by arrow X as the left-right direction. Furthermore, the direction perpendicular to the plane of the paper on which FIG. 1 is drawn will be referred to as the front-rear direction. These directions are defined for the sake of convenience and do not limit the arrangement direction of the electromagnetic relay 100. The left-right direction in this embodiment is an example of a first direction, and the up-down direction in this embodiment is an example of a second direction.

[0021] 1 is a schematic cross-sectional view of an electromagnetic relay 100. As shown in FIG.

[0022] The case 2 is in the shape of a substantially rectangular box and is made of an insulating material.

[0023] The contact device 3 is housed in a case 2. The contact device 3 includes a first fixed terminal 6, a second fixed terminal 7, a first fixed contact 8, a second fixed contact 9, a movable contact piece 10, a first movable contact 11, a second movable contact 12, and a movable mechanism 13.

[0024] The first fixed terminal 6 and the second fixed terminal 7 are plate-shaped terminals that extend in the left-right direction and extend from the inside to the outside of the case 2. The first fixed terminal 6 and the second fixed terminal 7 are made of a conductive material such as copper.

[0025] The first fixed terminal 6 includes a first contact support portion 6a and a first external connection portion 6b. The first contact support portion 6a is disposed within the case 2. The first contact support portion 6a extends parallel to the movable contact piece 10. The first external connection portion 6b protrudes leftward from the case 2 and is exposed to the outside of the case 2.

[0026] The second fixed terminal 7 is arranged spaced apart from the first fixed terminal 6 in the left-right direction. The second fixed terminal 7 is arranged to the right of the first fixed terminal 6. The second fixed terminal 7 includes a second contact support portion 7a and a second external connection portion 7b. The second contact support portion 7a is arranged inside the case 2. The second contact support portion 7a extends parallel to the movable contact piece 10. The second external connection portion 7b protrudes rightward from the case 2 and is exposed to the outside of the case 2.

[0027] The first fixed contact 8 is made of a conductive material such as copper. The first fixed contact 8 is connected to the first fixed terminal 6. The first fixed contact 8 is supported by the first contact support portion 6a. The first fixed contact 8 protrudes downward from the lower surface of the first contact support portion 6a.

[0028] The second fixed contact 9 is made of a conductive material such as copper. The second fixed contact 9 is connected to the second fixed terminal 7. The second fixed contact 9 is supported by the second contact support portion 7a. The second fixed contact 9 protrudes downward from the lower surface of the second contact support portion 7a.

[0029] The movable contact piece 10 is a plate-like member that is long in one direction and extends in the left-right direction within the case 2. In this embodiment, the longitudinal direction of the movable contact piece 10 coincides with the left-right direction. The lateral direction of the movable contact piece 10 coincides with the front-rear direction. The movable contact piece 10 is made of a conductive material such as copper.

[0030] The movable contact piece 10 is provided so as to be movable in a contact direction Z1 (here, an upward direction) in which the first movable contact 11 approaches the first fixed contact 8 and the second movable contact 12 approaches the second fixed contact 9, and in a separation direction Z2 (here, a downward direction) in which the first movable contact 11 moves away from the first fixed contact 8 and the second movable contact 12 moves away from the second fixed contact 9. That is, in this embodiment, the movable contact piece 10 is provided so as to be movable in the vertical direction.

[0031] As shown in Fig. 3, the movable contact piece 10 includes a through hole 10a. The through hole 10a is formed at the center of the movable contact piece 10 in the left-right direction. The through hole 10a is formed at the center of the movable contact piece 10 in the front-rear direction. The through hole 10a has a hole shape that penetrates in the up-down direction. The through hole 10a is circular when viewed from the up-down direction.

[0032] The first movable contact 11 is connected to the movable contact piece 10. The first movable contact 11 faces the first fixed contact 8 in the vertical direction. The first movable contact 11 is arranged below the first fixed contact 8. The first movable contact 11 protrudes upward from the upper surface of the movable contact piece 10. The first movable contact 11 can come into contact with the first fixed contact 8 in response to the movement of the movable contact piece 10. The first movable contact 11 is made of a conductive material such as copper.

[0033] The second movable contact 12 is connected to the movable contact piece 10. The second movable contact 12 faces the second fixed contact 9 in the vertical direction. The second movable contact 12 is arranged below the second fixed contact 9. The second movable contact 12 protrudes upward from the upper surface of the movable contact piece 10. The second movable contact 12 can come into contact with the second fixed contact 9 in response to the movement of the movable contact piece 10. The second movable contact 12 is made of a conductive material such as copper.

[0034] The movable mechanism 13 supports the movable contact piece 10. The movable mechanism 13 includes a drive shaft 21, a first holding member 22, a second holding member 23, and a contact spring 24.

[0035] The drive shaft 21 is an example of a moving member. The drive shaft 21 is an axial member that passes through the through-hole 10a of the movable contact piece 10 in the up-down direction. The drive shaft 21 extends parallel to the up-down direction. The drive shaft 21 is provided so as to be movable in the up-down direction. The drive shaft 21 is connected to the movable contact piece 10 at the center of the movable contact piece 10 in the left-right and front-rear directions so as to be movable relative to the movable contact piece 10.

[0036] The first holding member 22 is fixed to the drive shaft 21 above the movable contact piece 10. The second holding member 23 is fixed to the drive shaft 21 below the movable contact piece 10. The contact spring 24 is arranged in a compressed state between the movable contact piece 10 and the second holding member 23. The contact spring 24 is a coil spring, and the drive shaft 21 is arranged on its inner periphery. The contact spring 24 urges the movable contact piece 10 in the contact direction Z1.

[0037] The drive device 4 is disposed below the contact device 3. The drive device 4 moves the movable contact piece 10 by electromagnetic force via the drive shaft 21 of the movable mechanism 13. The drive device 4 includes a coil 31, a movable iron core 32, a fixed iron core 33, a yoke 34, and a return spring 35.

[0038] When a voltage is applied to the coil 31 and it is excited, it generates an electromagnetic force that moves the movable iron core 32 in the contact direction Z1. The movable iron core 32 is connected to the drive shaft 21 so as to be movable integrally therewith. The fixed iron core 33 is disposed in a position facing the movable iron core 32. The yoke 34 is disposed so as to surround the coil 31. The return spring 35 is disposed between the movable iron core 32 and the fixed iron core 33. The return spring 35 biases the movable iron core 32 in the separation direction Z2.

[0039] 1 shows the state in which the drive unit 4 is not energized. When the drive unit 4 is not energized, the first movable contact 11 is separated from the first fixed contact 8, and the second movable contact 12 is separated from the second fixed contact 9.

[0040] FIG. 2 shows a state in which the drive unit 4 is excited and the movable mechanism 13 moves in the contact direction Z1. When the drive unit 4 is excited, the movable core 32 moves in the contact direction Z1 together with the drive shaft 21. As the drive shaft 21 moves in the contact direction Z1, the contact spring 24 is compressed by the second holding member 23. This increases the force pressing the movable contact piece 10 in the contact direction Z1, causing the movable contact piece 10 to move in the contact direction Z1, with the first movable contact 11 contacting the first fixed contact 8 and the second movable contact 12 contacting the second fixed contact 9. In this state, the first holding member 22 is vertically spaced apart from the movable contact piece 10. Note that in the state shown in FIGS. 1 and 2, the movable contact piece 10 remains horizontal with respect to the drive shaft 21.

[0041] 3 and 4, the drive shaft 21 has a clearance C between it and the through hole 10a of the movable contact piece 10. This clearance C allows the movable contact piece 10 to come into direct or indirect contact with the second fixed terminal 7 in a state where it is tilted relative to the drive shaft 21 due to the biasing force of the contact spring 24 when at least one of the second fixed contact 9 and the second movable contact 12 is lost. The clearance C is a clearance provided between the drive shaft 21 and the through hole 10a of the movable contact piece 10 in the left-right direction. In other words, the clearance C allows the movable contact piece 10 to rotate clockwise and counterclockwise relative to the drive shaft 21 when viewed from the front-rear direction.

[0042] The clearance C is set so that when at least one of the second fixed contact 9 and the second movable contact 12 is lost and the movable contact piece 10 comes into direct or indirect contact with the second fixed terminal 7 in a state inclined relative to the drive shaft 21, the through hole 10a of the movable contact piece 10 does not interfere with the drive shaft 21 in the left-right direction.

[0043] The clearance C is set so that the drive shaft 21 can maintain a state parallel to the vertical direction when at least one of the second fixed contact 9 and the second movable contact 12 is lost and the movable contact piece 10 comes into direct or indirect contact with the second fixed terminal 7 in a state inclined relative to the drive shaft 21.

[0044] In this embodiment, as shown in Fig. 4, the clearance C is set so that the second fixed contact 9 and the second movable contact 12 are both lost and the movable contact piece 10 can directly contact the second fixed terminal 7 in a state in which it is tilted relative to the drive shaft 21 due to the biasing force of the contact spring 24. In the state shown in Fig. 4, the through hole 10a of the movable contact piece 10 does not interfere with the drive shaft 21 in the left-right direction, and the movable contact piece 10 is tilted relative to the drive shaft 21 when viewed from the front-rear direction, with the drive shaft 21 parallel to the up-down direction.

[0045] Note that Figure 5 shows a state in which the second movable contact 12 has disappeared and the movable contact piece 10 is tilted relative to the drive shaft 21, making indirect contact with the second fixed terminal 7 via the second fixed contact 9, while Figure 6 shows a state in which the second fixed contact 9 has disappeared and the movable contact piece 10 is tilted relative to the drive shaft 21, making indirect contact with the second fixed terminal 7 via the second movable contact 12.

[0046] In the electromagnetic relay 100 configured as described above, when at least one of the second fixed contact 9 and the second movable contact 12 melts and the movable contact piece 10 tilts relative to the drive shaft 21, the clearance C between the through hole 10a of the movable contact piece 10 and the drive shaft 21 can suppress interference between the movable contact piece 10 and the drive shaft 21. This allows the biasing force of the contact spring 24 to be efficiently transmitted to the movable contact piece 10 when at least one of the second fixed contact 9 and the second movable contact 12 melts. Furthermore, because the biasing force of the contact spring 24 can be efficiently transmitted to the movable contact piece 10, it is possible to set the biasing force of the contact spring 24 to be small.

[0047] The above describes an embodiment of an electromagnetic relay according to one aspect of the present invention, but the present invention is not limited to the above embodiment, and various modifications are possible within the scope of the gist of the invention.

[0048] In the above embodiment, the second fixed terminal 7 is disposed to the right of the first fixed terminal 6, but the second fixed terminal 7 may be disposed to the left of the first fixed terminal 6. In other words, the arrangement of the first fixed terminal 6 and the second fixed terminal 7, the arrangement of the first fixed contact 8 and the second fixed contact 9, and the arrangement of the first movable contact 11 and the second movable contact 12 may be interchanged.

[0049] The second fixed contact 9 and the second movable contact 12 may be made of different materials. Also, in the above embodiment, the first movable contact 11 and the second movable contact 12 may be embedded in the movable contact piece 10. That is, the first movable contact 11 and the second movable contact 12 do not have to protrude upward from the movable contact piece 10. When the first movable contact 11 and the second movable contact 12 protrude upward from the movable contact piece 10, the first fixed contact 8 may be embedded in the first fixed terminal 6, and the second fixed contact 9 may be embedded in the second fixed terminal 7. The tip surfaces of the first fixed contact 8, the second fixed contact 9, the first movable contact 11, and the second movable contact 12 may be arc-shaped in cross section.

[0050] The shape of the through hole 10a of the movable contact piece 10 may be changed. As shown in Fig. 7, the through hole 10a may have a tapered shape in which the clearance C between the through hole 10a and the drive shaft 21 increases as the through hole 10a extends in the contact direction Z1.

[0051] 8, the through hole 10a may have a first edge 41 in the contact direction Z1 that is rounded or C-chamfered. Also, the through hole 10a may have a second edge 42 in the separation direction Z2 that is rounded or C-chamfered.

[0052] As shown in Fig. 9, the through-hole 10a may have an elliptical shape that is elongated in the left-right direction when viewed from the top-bottom direction. Alternatively, as shown in Fig. 10, the through-hole 10a may have a rectangular shape that is elongated in the left-right direction when viewed from the top-bottom direction. Note that, as shown in Figs. 9 and 10, the clearance between the drive shaft 21 and the through-hole 10a of the movable contact piece 10 in the front-rear direction is preferably smaller than the clearance C.

[0053] 11, part of the clearance C may be formed by grooves 21a and 21b formed on the outer peripheral surface of the drive shaft 21. The grooves 21a and 21b prevent interference between the through hole 10a of the movable contact piece 10 and the drive shaft 21 when at least one of the second fixed contact 9 and the second movable contact 12 is lost and the movable contact piece 10 comes into direct or indirect contact with the second fixed terminal 7 in a state inclined relative to the drive shaft 21.

[0054] The groove 21a has a shape recessed toward the axis of the drive shaft 21. The groove 21a is provided at a position close to a first edge 41 of the through hole 10a when the first movable contact 11 is in contact with the first fixed contact 8 and the second movable contact 12 is in contact with the second fixed contact 9. The groove 21a is inclined so that the clearance C increases as it extends in the contact direction Z1 when viewed from the front-to-rear direction. The groove 21b is provided at a position close to a second edge 42 of the through hole 10a when the first movable contact 11 is in contact with the first fixed contact 8 and the second movable contact 12 is in contact with the second fixed contact 9. The groove 21b is inclined so that the clearance C increases as it extends in the separation direction Z2.

[0055] The clearance C may be formed by appropriately combining the shapes of the through holes 10a and grooves 21a described with reference to FIGS.

[0056] In the above embodiment, the drive shaft 21 is given as an example of the moving member, but the moving member may also be a holder 50 that holds the movable contact piece 10. In this case, the through hole 10a is formed at the center of the movable contact piece 10 in the longitudinal direction, and at both ends of the movable contact piece 10 in the front-rear direction. The holder 50 is arranged to sandwich the movable contact piece 10 in the front-rear direction. The holder 50 passes through the through hole 10a and is connected to the movable contact piece 10 so as to be able to move relative to it. In addition, the contact spring 24 is arranged between the holder 50 and the movable contact piece 10.

[0057] The configuration of the contact device 3 and the drive device 4 may be changed. For example, the movable contact piece 10 may be arranged above the first fixed terminal 6 and the second fixed terminal 7, and the fixed core 33 may be arranged below the movable core 32. [Explanation of symbols]

[0058] 6 1st fixed terminal 7 Second fixed terminal 8 1st fixed contact 9 Second fixed contact 10 Movable contact piece 10a through hole 11 1st movable contact 12 2nd movable contact + 21 Drive shaft (an example of a moving member) 24 Contact spring 41 First edge 42 Second edge 100 Electromagnetic relay C Clearance

Claims

1. a first fixed terminal; a first fixed contact connected to the first fixed terminal; a second fixed terminal disposed apart from the first fixed terminal in a first direction; a second fixed contact connected to the second fixed terminal; a movable contact piece including a through hole formed at the center in the first direction; a first movable contact connected to the movable contact piece and facing the first fixed contact in a second direction including a contact direction approaching the first fixed contact and a separation direction separating from the first fixed contact; a second movable contact connected to the movable contact piece and facing the second fixed contact in the second direction; a contact spring that urges the movable contact piece in the contact direction; a moving member that is movable in the second direction, passes through the through hole, and is connected to the movable contact piece at the center of the movable contact piece in the first direction so as to be relatively movable; Equipped with the moving member has a clearance between itself and the through hole of the moving contact piece that allows the moving contact piece to come into direct or indirect contact with the second fixed terminal in a state inclined relative to the moving member by the biasing force of the contact spring when at least one of the second fixed contact and the second movable contact is lost; Equipped with Electromagnetic relay.

2. The clearance of the moving member is set so that the through hole of the moving contact piece does not interfere with the moving member when at least one of the second fixed contact and the second moving contact is lost and the moving contact piece comes into direct or indirect contact with the second fixed terminal in a state inclined with respect to the moving member.

2. The electromagnetic relay according to claim 1.

3. the moving member is a shaft member that extends parallel to the second direction and passes through the through hole, the clearance of the moving member is set so that the moving member can maintain a state parallel to the second direction when at least one of the second fixed contact and the second movable contact is lost and the movable contact piece comes into direct or indirect contact with the second fixed terminal in a state inclined relative to the moving member; 2. The electromagnetic relay according to claim 1.

4. a part of the clearance of the movable member being formed by a groove formed on the outer circumferential surface of the movable member; 4. An electromagnetic relay according to claim 1.

5. The through hole of the movable contact piece has a tapered shape such that the clearance between the movable contact piece and the moving member increases as the through hole extends in the contact direction.

5. An electromagnetic relay according to claim 1.

6. the through hole of the movable contact piece includes a first edge portion in the contact direction, The first edge portion has an R-chamfered shape or a C-chamfered shape.

6. An electromagnetic relay according to any one of claims 1 to 5.

7. the through hole of the movable contact piece includes a second edge portion in the separation direction, The second edge portion has an R-chamfered shape or a C-chamfered shape.

7. An electromagnetic relay according to claim 1.

8. The through hole of the movable contact piece has an elliptical shape that is long in the first direction when viewed from the second direction.

8. An electromagnetic relay according to any one of claims 1 to 7.

9. The through hole of the movable contact piece has a rectangular shape that is long in the first direction when viewed from the second direction.

9. An electromagnetic relay according to any one of claims 1 to 8.

10. the first fixed terminal includes a first contact support portion that supports the first fixed contact, the second fixed terminal includes a second contact support portion that supports the second fixed contact, The first contact support portion and the second contact support portion extend parallel to the movable contact piece.

10. An electromagnetic relay according to any one of claims 1 to 9.

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