A relay

Abstract

A kind of relay, including seat body, contact assembly, magnetic circuit assembly and shell;Magnetic circuit assembly and contact assembly are arranged on seat body, shell is covered outside seat body;Contact assembly is equipped with static spring piece, static spring piece one end is equipped with first bending part and passes through seat body, static spring piece other end is equipped with second bending part and is equipped with in shell, first bending part and second bending part are provided with static contact point between;Its characterized in that: seat body is provided with the first slot extending along height direction at the place where static spring piece is, first bending part is equipped in the first slot;The side wall of shell close to second bending part is provided with the blocking portion extending along the height direction of seat body, blocking portion is opposite to second bending part to block the movement of static spring piece in height direction relative to seat body.The present application increases the structure of anti-pulling, ensures the stability of contact assembly assembly and the reliability of performance.

Description

Technical Field

[0001] This invention relates to the field of electrical components, and in particular to a relay. Background Technology

[0002] The push-rod type miniature relay consists of a base, a magnetic circuit section mounted on the base, a push-lock, and contact parts. The contact parts include a moving spring assembly and a stationary spring assembly. The moving spring assembly includes a moving spring with a moving contact, and the stationary spring assembly includes a stationary spring with a stationary contact. The magnetic circuit section includes a coil frame, an iron core, a yoke, and an armature. Its working principle is as follows: when the coil is energized, the iron core generates electromagnetic attraction, driving the armature to swing, which in turn drives the push-lock to push the moving spring, causing the moving contact on the moving spring to close / open with the stationary contact on the stationary spring. When the coil is de-energized or the excitation current decreases to a certain value, the counter-torque of the moving spring exceeds the electromagnetic attraction torque, causing the moving spring to return to its original position and push the push-lock, thereby causing the armature to swing back to its initial state, and the moving contact on the moving spring to open / close with the stationary contact on the stationary spring.

[0003] Currently, as the application scenarios for relays become increasingly diverse, the requirements for their various parameters are also becoming more stringent. This necessitates that relays not be too large. However, reducing the size of the relay means less internal space, which can easily lead to problems in the layout and installation of components. For example, because the connection between the stationary spring and the housing in the contact section is designed to resist pull-out, the spring can easily be pulled out with even a small external force. Furthermore, an insufficient creepage distance between the contact section and the magnetic circuit affects the stability of the relay structure and the reliability of its performance. Summary of the Invention

[0004] The main objective of this invention is to overcome the aforementioned deficiencies in the prior art and to propose a relay with an enhanced pull-out resistance structure to ensure the stability of the contact assembly and the reliability of its performance.

[0005] The present invention adopts the following technical solution:

[0006] A relay includes a base, a contact assembly, a magnetic circuit assembly, and a housing; the magnetic circuit assembly and the contact assembly are disposed on the base, and the housing is disposed on the base; the contact assembly has a stationary spring, one end of which has a first bend and passes through the base, and the other end of which has a second bend and passes through the housing, and a stationary contact is disposed between the first bend and the second bend; the base has a first slot extending in the height direction at the location of the stationary spring, and the first bend passes through the first slot; the side wall of the housing near the second bend has a stop extending in the height direction of the base, the stop being opposite to the second bend to prevent the stationary spring from moving relative to the base in the height direction.

[0007] The housing has a first insertion hole on its side wall in the height direction of the seat; the second bent portion passes through the first insertion hole and has a first inclined surface at the bend; the end of the stop portion near the first insertion hole and away from the side wall of the housing has a second inclined surface that is adapted to and opposite to the first inclined surface.

[0008] The first slot is provided with two limiting ribs on each of its two side walls in the width direction of the base body. The two limiting ribs and the first slot form a limiting groove between the side wall in the length direction of the base body for the first bent part to be inserted and for limiting the first bent part. The first slot is also provided with a second insertion hole on its side wall in the height direction of the base body. The second insertion hole and the limiting groove are spaced apart in the length direction of the base body. After the first bent part is inserted into the limiting groove, it passes through the second insertion hole.

[0009] The contact assembly includes two stationary springs and one movable spring. The two stationary springs are spaced apart along the length of the seat. The seat is provided with two first slots spaced apart along the length of the seat, and a slot is formed between the two first slots. The movable contact of the contact assembly is located between the stationary contacts of the two stationary springs and above the slot.

[0010] The base is also provided with a second slot extending along the height direction of the base, and the second slot and the first slot are respectively close to the two sides of the width direction of the base; the contact assembly is provided with a movable spring and a movable spring lead-out piece, the movable spring lead-out piece is inserted into and passes through the second slot; one end of the movable spring is connected to the movable spring lead-out piece, and the other end of the movable spring extends along the width direction of the base to above the empty slot and is provided with the movable contact.

[0011] The housing is provided with a first groove and a second groove extending along the height direction of the seat body on the side away from the seat body; the second bent part of the stationary spring is located in the first groove; the end of the moving spring lead-out piece away from the seat body is located in the second groove.

[0012] The magnetic circuit assembly includes a coil assembly, a yoke, an armature, and a pusher; the yoke includes a first yoke portion and a second yoke portion extending along the length direction of the base, the first yoke portion passing through the coil assembly, and one end of the first yoke portion and the second yoke portion being connected; the armature is arranged along the height direction of the base and located at the other end of the first yoke portion and the second yoke portion, one end of the armature overlapping the corresponding end of the second yoke portion; the pusher is arranged along the length direction of the base and one end of it is connected to one end of the armature, and the other end of the pusher is connected to the moving spring of the contact assembly; the armature swings to drive the pusher to move, thereby driving the moving spring to actuate.

[0013] The end of the push card connected to the movable spring is provided with two card plates spaced apart along the length direction of the seat body. The two card plates are located on the side of the push card opposite to the movable spring and form a card groove. The side of the movable spring opposite to the push card is engaged in the card groove and is provided with two protrusions. The two protrusions are spaced apart along the width direction of the seat body and are respectively engaged on the two outer sides of the side wall of the card groove.

[0014] The base body is provided with a mounting cavity, the magnetic circuit assembly is disposed in the mounting cavity, and the contact assembly is located outside the mounting cavity; the housing is provided with a baffle extending along the height direction of the base body on the side opposite to the base body, and the baffle is located on the outer periphery of the side wall adjacent to the mounting cavity and the contact assembly.

[0015] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects:

[0016] In this invention, a first slot is provided on the base for inserting the first bent portion of the stationary spring. A stop is provided on the side wall of the housing near the second bent portion. The stop prevents the stationary spring from moving relative to the base in the height direction, thus giving the stationary spring pull-out resistance. This ensures the reliability of the stationary spring assembly and fixation, guarantees the normal use of the relay during insertion and removal, and ensures that its performance is not affected.

[0017] In this invention, the housing is provided with a first insertion hole for the first bent portion to pass through, and the stop portion is close to the first insertion hole and is provided with a second inclined surface that is adapted to and opposite to the first inclined surface of the second bent portion. The movement of the second bent portion of the stationary spring relative to the housing is blocked by the second inclined surface pressing against the first inclined surface. The structure is simple and easy to implement.

[0018] In this invention, the base is provided with a receiving cavity to separate the magnetic circuit part from the moving and stationary spring parts. A limiting rib is provided in the first slot to form a limiting groove to limit the first bending part. An empty groove is formed between adjacent first slots. The base is also provided with a second slot for the moving spring lead-out piece to pass through, which ensures that the insertion connection between the stationary spring piece and the moving spring lead-out piece and the base is more stable, and also increases the insulation creepage distance.

[0019] In this invention, the magnetic circuit part includes a coil assembly, a yoke, an armature, and a pusher. The yoke is provided with a first yoke part and a second yoke part. The first yoke part passes through the coil assembly, the armature is connected to the second yoke part and connected to the pusher. The pusher and the stationary spring are engaged by a slot. The armature swings to drive the pusher to move and drive the moving spring to move. With this pusher structure, the magnetic circuit part is compact and the overall volume is reduced.

[0020] In this invention, a first groove and a second groove are also provided on the base body, which are respectively used to accommodate the second bent part of the stationary spring sheet and the corresponding end of the moving spring lead sheet, and are used to strengthen the insulation between adjacent stationary spring sheets and between the moving spring sheet and the stationary spring lead sheet. Attached Figure Description

[0021] Figure 1 This is a structural diagram of the present invention;

[0022] Figure 2 for Figure 1 The main view;

[0023] Figure 3 for Figure 1 Exploded view;

[0024] Figure 4 Diagram showing the mating of the magnetic circuit assembly and the contact assembly;

[0025] Figure 5 This is a structural diagram of the base.

[0026] Figure 6 This is a diagram of the shell structure;

[0027] Figure 7 This is a diagram of the internal structure of the shell;

[0028] Figure 8 To promote the card structure diagram;

[0029] Figure 9 To promote the card stereoscopic image;

[0030] Figure 10 for Figure 1 A sectional view;

[0031] in:

[0032] 10. Base; 11. Mounting cavity; 12. First slot; 13. Second slot; 14. Empty slot; 15. Limiting rib; 16. Limiting groove; 17. Second insertion hole; 20. Contact assembly; 21. Stationary spring; 21a. First bend; 21b. Second bend; 21c. First inclined surface; 22. Stationary contact; 23. Moving spring; 24. Moving spring lead-out piece; 25. Moving contact; 26. Protrusion; 30. Magnetic circuit assembly; 31. Coil group; 32. Yoke; 32a. First yoke part; 32b. Second yoke part; 33. Armature; 34. Pusher; 35. Card plate; 36. Card slot; 40. Housing; 41. Stop; 42. First insertion hole; 43. Second inclined surface; 44. First groove; 45. Second groove; 46. Baffle.

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0034] The present invention will be further described below through specific embodiments.

[0035] See Figures 1 to 10 A relay includes a base 10, a contact assembly 20, a magnetic circuit assembly 30, and a housing 40. The base 10 has a mounting cavity 11 with an opening at the top. The magnetic circuit assembly 30 is disposed within the mounting cavity 11, and the contact assembly 20 is located outside one side of the mounting cavity 11. The housing 40 covers the base 10, enclosing the mounting cavity 11, thus enclosing the base 10, contact assembly 20, and magnetic circuit assembly 30 within the mounting cavity 11.

[0036] The contact assembly 20 is provided with at least one stationary spring 21. The stationary spring 21 extends along the height direction of the base 10 and has a first bend 21a at one end, which passes through the base 10, i.e., the end of the first bend 21a is exposed outside the base 10. The other end of the stationary spring 21 has a second bend 21b, which passes through the housing 40. A stationary contact 22 is provided between the first bend 21a and the second bend 21b. The contact assembly 20 may be provided with one stationary spring 21, two stationary springs 21, or more. The figure shows two stationary springs 21 as an example, which are distributed at intervals along the length direction of the base 10. In the length direction of the base 10, one stationary spring 21 is close to the mounting cavity 11 and can serve as a normally open contact; the other stationary spring 21 is away from the mounting cavity 11 and close to the side wall of the housing and can serve as a normally closed contact. The two stationary contacts 22 on the two stationary springs 21 are arranged opposite to each other.

[0037] The base 10 has a first slot 12 extending along the height direction at the location of the stationary spring 21. In the height direction of the base 10, the size of the first slot 12 is smaller than the size of the mounting cavity 11. A first bend 21a passes through the first slot 12 to ensure the stability of the stationary spring 21 insertion. The stationary contact 22 is located above the first slot 12. The number of first slots 12 corresponds to the number of stationary springs 21. For two or more stationary springs 21, there is a gap between adjacent first slots 12 to form a slot 14. The moving contact 25 of the contact assembly 20 is located above the slot 14. By providing first slots 12 for the stationary spring 21 to pass through on the base 10 and providing slots 14 between two first slots 12, the insulation creepage distance can be increased.

[0038] A stop 41 extending along the height direction of the seat 10 is provided on the side wall of the housing 40 near the second bend 21b. The stop 41 is opposite to the second bend 21b and is provided to prevent the stationary spring 21 from moving relative to the seat 10 in the height direction, thereby increasing the pull-out resistance of the stationary spring 21 and making it less likely to be pulled out during insertion and removal. The stop 41 can be provided on the housing 40 for each stationary spring 21 or for some stationary springs 21, depending on actual needs. In the figure, the housing 40 provides the stop 41 for normally open stationary springs 21, and does not provide the stop 41 for normally closed stationary springs 21.

[0039] Furthermore, the housing 40 has a first insertion hole 42 on its side wall in the height direction of the seat 10. The vertical section of the second bent portion 21b passes through the first insertion hole 42. The bend of the second bent portion 21b is located inside the housing 40 and has a first inclined surface 21c at the bend. The end of the stop portion 41 near the first insertion hole 42 and away from the side wall of the housing 40 has a second inclined surface 43 that is adapted to and opposite to the first inclined surface 21c. The first inclined surface 21c and the second inclined surface 43 can be in contact or have a gap. In the length direction of the seat 10, the stop portion 41 is located between the stationary contact point 22 of the stationary spring 21 and the corresponding first insertion hole 42.

[0040] In this embodiment, the first slot 12 is further provided with two limiting ribs 15 on each of its two side walls in the width direction of the base 10. A limiting groove 16 is formed between the two limiting ribs 15 and the side wall of the first slot 12 in the length direction of the base 10. This limiting groove 16 is used to insert the bent section of the second bent portion 21a and to limit the movement of the second bent portion 21a in the length direction of the base 10, i.e., to restrict the movement of the stationary spring 21 and its second bent portion 21a in the length direction of the base 10. The first slot 12 is also provided with a second insertion hole 17 on the side wall in the height direction of the base 10. The second insertion hole 17 and the limiting groove 16 are spaced apart in the length direction of the base 10. The bent section of the second bent portion 21a is inserted into the limiting groove 16, and its vertical section passes through the second insertion hole 17. Using this first slot 12 can also improve the pull-out resistance of the second bent portion 21a of the stationary spring 21, and, together with the stop 41 on the housing 40, enhance the overall pull-out resistance of the stationary spring 21.

[0041] The contact assembly 20 is also provided with a movable spring 23 and a movable spring lead-out piece 24. The movable spring lead-out piece 24 is located outside the mounting cavity 11 and on the side of the seat 10 away from the stationary spring 21 in the width direction. The movable spring lead-out piece 24 extends along the height direction of the seat 10, with one end passing through the seat 10. One end of the movable spring 23 is fixedly connected to the movable spring lead-out piece 24, and the other end of the movable spring 23 extends along the width direction of the seat 10 to be opposite to the stationary spring 21. The movable spring 23 is provided with a movable contact 25 opposite to the stationary contact 22. In the figure, the movable contact 25 is opposite to the two stationary contacts 22 and is located between the two stationary contacts 22. The movable contact 25, the movable spring lead-out piece 24, and the movable spring 23 are connected by riveting.

[0042] Furthermore, the base 10 is also provided with a second slot 13 extending along the height direction of the base 10. The second slot 13 and the first slot 12 are respectively located near the two sides of the base 10 in the width direction. The dimension of the second slot 13 in the height direction of the base 10 can be less than or equal to the dimension of the mounting cavity 11. The moving spring lead-out piece 24 is inserted into and passes through the second slot 13. The second slot 13 ensures that the insertion between the moving spring lead-out piece 24 and the base 10 is more stable and reliable. This frame-like structure of the mounting cavity 11, combined with the first slot 12 and the second slot 13, can increase the insulation and creepage isolation between the magnetic circuit assembly 30 and the contact assembly 20, and enhance the insulation performance between the coil and the contacts.

[0043] On the side of the housing 40 away from the seat 10, there are also a first groove 44 and a second groove 45 extending along the height direction of the seat 10. The vertical ends of the second bent portions 21b of the stationary springs 21 of the contact assembly 20 are correspondingly inserted into the first groove 44. The dimension of the first groove 44 in the height direction of the seat 10 corresponds to the dimension of the vertical section of the second bent portion 21b. The end of the moving spring lead-out piece 24 away from the seat 10 is located in the second groove 45. In the figure, the two first grooves 44 are provided to accommodate the vertical sections of the second bent portions 21b of the corresponding two stationary springs 21, and the second grooves 45 are provided to accommodate the corresponding ends of the moving spring lead-out pieces 24, which is used to strengthen the insulation between adjacent stationary springs 21 and between the moving spring lead-out piece 24 and the stationary springs 21 in the contact assembly 20.

[0044] In this embodiment, the magnetic circuit assembly 30 includes a coil group 31, a yoke 32, an armature 33, and a pusher 34. The coil group 31 is arranged along the length of the base 10 and includes a frame and coils wound around the outer periphery of the frame. The yoke 32 includes a first yoke portion 32a and a second yoke portion 32b extending along the length of the base 10. The first yoke portion 32a passes through the coil group 31 as a core, and the first yoke portion 32a and the second yoke portion 32b are connected at one end along the length of the base 10. The armature 33 is arranged along the height of the base 10 and is located at the other end of the first yoke portion 32a and the second yoke portion 32b. One end of the armature 33 overlaps the corresponding end of the second yoke portion 32b, and the other end of the armature 33 is opposite to the corresponding end of the first yoke portion 32a. The pusher 34 is located above the second yoke 32b and is arranged along the length of the base 10. One end of the pusher 34 is connected to one end of the armature 33, and the other end of the pusher 34 is connected to the movable spring 23 of the contact assembly 20. The pusher 34 can be driven to move along the length of the base 10. The armature 33 swings, causing the pusher 34 to move and thus driving the movable spring 23 to move, or the movable spring 23 returns to its original position, causing the pusher 34 to move and thus causing the armature 33 to swing back to its original position. In the figure, the movement of the movable spring 23 can cause the moving contact 25 to close with one of the stationary contacts 22 and separate from the other stationary contact 22.

[0045] Furthermore, the end of the push card 34 connected to the movable spring 23 is provided with two locking plates 35 spaced apart along the length of the base 10. The two locking plates 35 are located on the side of the push card 34 opposite to the movable spring 23 and form a locking groove 36. The side of the movable spring 23 opposite to the push card 34 is locked in the locking groove 36. The movable spring 23 is also provided with two protrusions 26 at the mating point with the locking groove 36. The two protrusions 26 extend along the length of the base 10 and are spaced apart along the width of the base 10. The two protrusions 26 are respectively locked on the two outer sides of the side wall of the locking groove 36, thereby ensuring the stability and reliability of the connection between the push card 34 and the movable spring 23.

[0046] In this embodiment, there is a gap between the top surface of the base 10 and the corresponding side of the housing 40. A baffle 46 extending along the height direction of the base 10 is also provided on the opposite side of the housing 40 and the base 10. The baffle 46 is located on the outer periphery of the side wall adjacent to the mounting cavity 11 and the contact assembly 20. There are one or more baffles 46, and they are provided with notches to allow the push card 34 to move, thus avoiding interference with the movement of the push card 34. By sealing the gap between the top surface of the base 10 and the corresponding side of the housing 40 through the baffle 46, insulation and creepage isolation between the magnetic circuit assembly 30 and the contact assembly 20 are further ensured.

[0047] In the relay of the present invention, under normal conditions, the moving contact 25 of the moving reed 23 is in contact with the normally closed stationary contact 22 of the stationary reed 21. When the coil assembly 31 is energized, the first yoke 32a generates an electromagnetic attraction force that drives the armature 33 to engage. The armature 33 drives the pusher 34 to pull the moving reed 23, causing the moving contact 25 to disconnect from the normally closed stationary contact 22 of the stationary reed 21 and connect with the normally open stationary contact 22 of the stationary reed 21. When the coil assembly 31 is de-energized, under the reaction force of the moving reed 23, the moving contact 25 disconnects from the normally open stationary contact 22 of the stationary reed 21 and closes with the normally closed stationary contact 22 of the stationary reed 21. The moving reed 23 also drives the pusher 34 and the armature 33 to return to the normal state.

[0048] When the relay is plugged in or the stationary spring is pulled out, due to the action of the first slot 12 and the stop 41, the connection between the stationary spring 21 and the base 10 and the stationary spring 21 and the housing 40 is very stable. The stationary spring 21 has the ability to resist pulling and will not be easily pulled out, ensuring that the stationary spring 21 is reliably assembled and fixed, and ensuring that the use and performance of the relay are not affected.

[0049] In this invention, the terms "first," "second," and "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. The use of terms such as "upper," "lower," "left," "right," "front," and "rear" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention, not to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this invention. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0051] The above are merely specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A relay, comprising a base, a contact assembly, a magnetic circuit assembly, and a housing; the magnetic circuit assembly and the contact assembly are disposed on the base, and the housing is disposed outside the base; the contact assembly has a stationary spring, one end of the stationary spring having a first bend that passes through the base, and the other end of the stationary spring having a second bend that passes through the housing, and a stationary contact being disposed between the first bend and the second bend; characterized in that: The seat body has a first slot extending along the height direction at the location of the stationary spring, and the first bent portion passes through the first slot; the side wall of the housing near the second bent portion has a stop extending along the height direction of the seat body, and the stop is opposite to the second bent portion to prevent the stationary spring from moving relative to the seat body in the height direction.

2. A relay as described in claim 1, characterized in that: The housing has a first insertion hole on its side wall in the height direction of the seat; the second bent portion passes through the first insertion hole and has a first inclined surface at the bend; the end of the stop portion near the first insertion hole and away from the side wall of the housing has a second inclined surface that is adapted to and opposite to the first inclined surface.

3. A relay as described in claim 1, characterized in that: The first slot is provided with two limiting ribs on each of its two side walls in the width direction of the base body. The two limiting ribs and the first slot form a limiting groove between the side wall in the length direction of the base body for the first bent part to be inserted and for limiting the first bent part. The first slot is also provided with a second insertion hole on its side wall in the height direction of the base body. The second insertion hole and the limiting groove are spaced apart in the length direction of the base body. After the first bent part is inserted into the limiting groove, it passes through the second insertion hole.

4. A relay as described in claim 1, characterized in that: The contact assembly includes two stationary springs and one movable spring. The two stationary springs are spaced apart along the length of the seat. The seat is provided with two first slots spaced apart along the length of the seat, and a slot is formed between the two first slots. The movable contact of the contact assembly is located between the stationary contacts of the two stationary springs and above the slot.

5. A relay as described in claim 4, characterized in that: The base is also provided with a second slot extending along the height direction of the base, and the second slot and the first slot are respectively close to the two sides of the width direction of the base; the contact assembly is provided with a movable spring and a movable spring lead-out piece, the movable spring lead-out piece is inserted into and passes through the second slot; one end of the movable spring is connected to the movable spring lead-out piece, and the other end of the movable spring extends along the width direction of the base to above the empty slot and is provided with the movable contact.

6. A relay as described in claim 5, characterized in that: The housing is provided with a first groove and a second groove extending along the height direction of the seat body on the side away from the seat body; the second bent part of the stationary spring is located in the first groove; the end of the moving spring lead-out piece away from the seat body is located in the second groove.

7. A relay as described in claim 5, characterized in that: The magnetic circuit assembly includes a coil group, a yoke, an armature, and a pusher; the yoke includes a first yoke portion and a second yoke portion extending along the length direction of the base, the first yoke portion passing through the coil assembly, and one end of the first yoke portion and the second yoke portion being connected; the armature is arranged along the height direction of the base and located at the other end of the first yoke portion and the second yoke portion, one end of the armature overlapping the corresponding end of the second yoke portion; the pusher is arranged along the length direction of the base and one end of it is connected to one end of the armature, and the other end of the pusher is connected to the moving spring of the contact assembly; the armature swings to drive the pusher to move, thereby driving the moving spring to actuate.

8. A relay as described in claim 5, characterized in that: The end of the push card connected to the movable spring is provided with two card plates spaced apart along the length direction of the seat body. The two card plates are located on the side of the push card opposite to the movable spring and form a card groove. The side of the movable spring opposite to the push card is engaged in the card groove and is provided with two protrusions. The two protrusions extend along the length direction of the seat body and are spaced apart along the width direction of the seat body. The two protrusions are respectively engaged on the two outer sides of the side wall of the card groove.

9. A relay as described in claim 1, characterized in that: The base body is provided with a mounting cavity, the magnetic circuit assembly is disposed in the mounting cavity, and the contact assembly is located outside the mounting cavity; the housing is provided with a baffle extending along the height direction of the base body on the side opposite to the base body, and the baffle is located on the outer periphery of the side wall adjacent to the mounting cavity and the contact assembly.

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