Electromagnetic relay resistant to short-circuit current

Abstract

The application discloses an electromagnetic relay with anti-short-circuit current, which comprises a magnetic circuit system and at least one contact unit, the contact unit comprises a moving spring part and two static spring parts arranged side by side, the moving spring part is arranged on an armature part of the magnetic circuit system and cooperates with the two static spring parts; each static spring part comprises a static spring lead-out sheet and a static spring sheet, one end of the static spring sheet is electrically connected with the static spring lead-out sheet, the other end of the static spring sheet is provided with a static contact point, and the current flowing direction of the static spring sheet is opposite to that of the static spring lead-out sheet; the moving spring part comprises a conductive sheet and an elastic member, the elastic member is connected with the armature part, the conductive sheet is connected with the elastic member, and the conductive sheet is respectively provided with a moving contact point corresponding to the static contact points of the two static spring parts. The application makes the static spring sheet relatively short, and is suitable for the electromagnetic relay with compact structure and small size.

Description

Technical Field

[0001] This invention relates to the field of relay technology, and in particular to an electromagnetic relay resistant to short-circuit current. Background Technology

[0002] A relay is an automatic switching element with isolation function. It is widely used in home appliances, remote control, telemetry, communication, automatic control, mechatronics and power electronic equipment. It is one of the most important control elements and plays a role in automatic adjustment, safety protection and circuit switching in control circuits.

[0003] Traditional electromagnetic relays have very low short-circuit current withstand capability. When a short-circuit current passes through, the contacts are easily repelled by the Holm force, resulting in open circuits or contact failure. To address this, existing technology has developed electromagnetic relays with short-circuit current withstand capabilities. Currently, the short-circuit current withstand structure in these relays is mostly located in the moving spring section, requiring additional transmission components (such as push clips), which not only increases cost and assembly difficulty but is also unsuitable for compact electromagnetic relays with smaller dimensions. Some relays place the short-circuit current withstand structure in the stationary spring section, forming a U-shaped loop. When the contacts are closed, a Lorentz force is generated towards the moving spring section. This Lorentz force counteracts the Holm force on the stationary contacts, making it less likely for the stationary and moving contacts to repel each other when a short-circuit current passes through the relay, thus improving the relay's short-circuit current withstand capability. This type of relay, with the short-circuit current withstand structure in the stationary spring section, eliminates the need for additional transmission components, reducing cost and assembly difficulty, but it is still unsuitable for compact electromagnetic relays with smaller dimensions. This is because the stationary spring portion, besides its function of resisting short-circuit current, also serves to enable contact overtravel. This necessitates making the stationary spring plate relatively long, even taller than the magnetic circuit system, to provide better flexibility and allow for deformation after contact. However, a longer stationary spring plate results in a larger overall size of the relay along its length, hindering product miniaturization. Furthermore, in cases with multiple sets of contacts, a certain air gap and creepage distance are required between different sets. With a constant relay height, a longer stationary spring lead and plate design will lead to insufficient air gaps and creepage distances between different sets. Summary of the Invention

[0004] This invention addresses the technical problems existing in the prior art by providing an electromagnetic relay that is resistant to short-circuit current. While achieving resistance to short-circuit current and contact overtravel, it allows for a shorter length of the stationary spring, which is beneficial for product miniaturization. Furthermore, when the product has multiple sets of contacts, it is easier to meet the specifications for air gap and creepage distance between different sets.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: an electromagnetic relay resistant to short-circuit current, comprising a magnetic circuit system and at least one contact unit. The contact unit includes a moving spring portion and two stationary spring portions arranged side by side. The moving spring portion is disposed on the armature portion of the magnetic circuit system and cooperates with the two stationary spring portions. Each stationary spring portion includes a stationary spring lead-out piece and a stationary spring piece. One end of the stationary spring piece is electrically connected to the stationary spring lead-out piece, and the other end of the stationary spring piece is provided with a stationary contact. The current flow direction of the stationary spring piece and the stationary spring lead-out piece is opposite. The moving spring portion includes a conductive piece and an elastic element. The elastic element is connected to the armature portion, and the conductive piece is connected to the elastic element. Moving contacts are respectively provided on the conductive piece at the positions corresponding to the stationary contacts of the two stationary spring portions.

[0006] Furthermore, the armature portion is L-shaped, one side of the armature portion and the conductive sheet are connected to the same side of the elastic member, and there is a preset distance between one side of the armature portion and the conductive sheet.

[0007] Furthermore, the stationary spring sheet is a thin rigid sheet with a thickness less than that of the stationary spring lead sheet, and the stationary spring lead sheet and the stationary spring sheet form a U-shaped or V-shaped circuit; the elastic element is sheet-shaped and made of stainless steel, and the conductive sheet is rigid.

[0008] Furthermore, the base is provided with a first isolation wall between the two stationary spring parts. The top of the first isolation wall is higher than the top of the stationary spring part, and the side of the first isolation wall facing the moving spring part protrudes from the stationary contact point, so that the air gap between the two stationary spring parts is ≥3.6mm.

[0009] Furthermore, the contact gap between the moving contact and the stationary contact in the open state is ≥1.8mm, and the thickness of the moving contact is greater than the thickness of the stationary contact.

[0010] Furthermore, after the moving contact and the stationary contact are closed, the distance between the first isolation wall and the conductive sheet is ≥0.5mm.

[0011] Furthermore, there are multiple contact units arranged side by side; the base has a second isolation wall between adjacent contact units, and the top of the second isolation wall is higher than the top of the static spring portion.

[0012] Furthermore, the number of contact units is two. In one contact unit, the two stationary spring leads are bent to form a first lead-out portion and a second lead-out portion passing through the base in sequence. In the other contact unit, the two stationary spring leads are bent to form a third lead-out portion and a fourth lead-out portion passing through the base in sequence. The first lead-out portion and the second lead-out portion protrude toward the side of the stationary spring portion facing the moving spring portion, and the first lead-out portion and the second lead-out portion are located at both ends of the contact system in the arrangement direction of its two contact units. The third lead-out portion and the fourth lead-out portion protrude toward the side of the stationary spring portion away from the moving spring portion, and the third lead-out portion and the fourth lead-out portion are located at both ends of the contact system in the arrangement direction of its two contact units.

[0013] Furthermore, the upstream portion of the third or fourth lead-out portion is an extension portion extending along the arrangement direction, and the extension portion is located on the side of the two stationary spring portions of one of the contact units facing away from the moving spring portion; the base is provided with a third isolation wall between the extension portion and the two stationary spring portions of one of the contact units.

[0014] Furthermore, it also includes an auxiliary contact assembly, which includes an auxiliary moving spring and an auxiliary stationary spring mounted on the base and cooperating with each other. The auxiliary moving spring is driven by the armature portion, and the state of the auxiliary contact assembly is opposite to the state of the contact system.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Because the stationary spring portion of this invention includes a stationary spring lead-out piece and a stationary spring piece, the stationary spring lead-out piece is disposed on the base, one end of the stationary spring piece is electrically connected to the stationary spring lead-out piece, and the other end of the stationary spring piece is provided with a stationary contact, and the current flow direction of the stationary spring piece and the stationary spring lead-out piece is opposite; the moving spring portion includes a conductive piece and an elastic element, the elastic element is connected to the armature portion, the conductive piece is connected to the elastic element, and the conductive piece is provided with moving contacts at the positions corresponding to the stationary contacts of the two stationary spring portions, so that the stationary spring portion of this invention has the function of resisting short-circuit current, the moving spring portion is directly driven by the armature portion, and after the moving contact contacts the stationary contact, the elastic deformation of the elastic element can realize the contact overtravel function, so that the stationary spring portion of this invention does not need to bear the function of realizing the contact overtravel. Therefore, the stationary spring piece of this invention can be made relatively short, making this invention suitable for electromagnetic relays with relatively compact structure and small size. In particular, when there are multiple sets of contacts (i.e., multiple contact units), this invention is more convenient to meet the specifications for air gap and creepage distance between different sets.

[0017] 2. The base has the first isolation wall between the two stationary spring portions of the contact unit, enabling the present invention to meet the basic insulation requirements for the contact gap between the same group while miniaturizing the relay. In particular, after the moving contact and the stationary contact are closed, the distance between the first isolation wall and the conductive sheet is ≥0.5mm, which can prevent interference between the first isolation wall and the conductive sheet after the contact is consumed.

[0018] 3. Based on the multiple contact units, this invention provides a second / third isolation wall on the base, which can isolate different groups of contacts from each other and prevent arc short circuits of 500A or more. In particular, with two contact units, the layout design of the first, second, third, and fourth leads ensures that the creepage distance and air gap of different components meet the requirements for enhanced insulation.

[0019] 4. This invention can realize multiple sets of normally open contacts for 35A load, with the contact gap in the same group reaching 3.6mm. The main contacts of adjacent groups are isolated from each other, meeting the requirements of 1500A (@16A) in IEC 62752 and 3000A (@16A) + 500A short-circuit current of live and neutral wires in IEC 62955. Moreover, the air gap and creepage distance between the contacts and the coil can reach more than 10mm.

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the electromagnetic relay of the present invention that resists short-circuit current is not limited to the embodiments. Attached Figure Description

[0021] Figure 1 This is the front view of the present invention;

[0022] Figure 2 This is the left view of the present invention;

[0023] Figure 3 This is the right view of the present invention;

[0024] Figure 4 This is a three-dimensional structural diagram of the contact system and armature portion of the present invention in an assembled state;

[0025] Figure 5 yes Figure 4 The main view;

[0026] Figure 6 This is a three-dimensional structural diagram of the four stationary spring parts of the present invention;

[0027] Figure 7 This is a three-dimensional structural diagram of the armature portion and the moving spring portion of the present invention in an assembled state;

[0028] Figure 8 yes Figure 2 AA cross-sectional view with contacts open;

[0029] Figure 9 yes Figure 8 Enlarged schematic diagram of part B in the middle;

[0030] Figure 10 yes Figure 2 A cross-sectional view of AA with the contacts closed;

[0031] Figure 11 yes Figure 10 An enlarged schematic diagram of section C;

[0032] In the diagram, 1. Base, 11. First isolation wall, 12. Second isolation wall, 13. Third isolation wall, 2. Magnetic circuit system, 21. Armature part, 211. Armature, 212. Plastic part, 213. Connecting piece, 22. Restoring spring, 3. Moving spring part, 31. Conductive piece, 32. Elastic part, 33. Moving contact, 4. Stationary spring part, 41. Stationary spring lead-out piece, 411. First lead-out part, 412. Second lead-out part, 413. Third lead-out part, 414. Fourth lead-out part, 415. Extension part, 42. Stationary spring, 421. Connecting part, 422. Bending part, 423. Main body part, 43. Stationary contact, 5. Auxiliary moving spring, 6. Auxiliary stationary spring. Detailed Implementation

[0033] In this invention, the terms "first," "second," etc., are used only to distinguish similar objects, not 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.

[0034] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" refers to two or more. In the description of this invention, unless otherwise explicitly specified and limited, terms such as "installed," "equipped with," and "connected" should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Please see Figures 1-11 As shown, an electromagnetic relay for short-circuit current protection according to the present invention includes a base 1, a contact system, and a magnetic circuit system 2 disposed on the base 1. The contact system includes at least one contact unit, which includes a moving spring portion 3 and two stationary spring portions 4 arranged side by side. The moving spring portion 3 is disposed on the armature portion 21 of the magnetic circuit system 2 and cooperates with the two stationary spring portions 4. Each stationary spring portion 4 includes a stationary spring lead-out piece 41 and a stationary spring piece 42. The stationary spring lead-out piece 41 is disposed on the base 1. One end of the stationary spring piece 42 is electrically connected to the stationary spring lead-out piece 41, and the other end of the stationary spring piece 42 is provided with a stationary contact 43. The current flow direction of the stationary spring piece 42 is opposite to that of the stationary spring lead-out piece 41. Specifically, the stationary spring lead-out piece 41 and the stationary spring piece 42 form a U-shaped or V-shaped circuit. The moving spring part 3 includes a conductive sheet 31 and an elastic element 32. The elastic element 32 is connected to the armature part 21, and the conductive sheet 31 is connected to the elastic element 32. Moving contacts 33 are respectively provided on the conductive sheet 31 at the positions corresponding to the stationary contacts 43 of the two stationary spring parts 4.

[0036] like Figure 5 As shown, the stationary spring 42 includes a connecting portion 421, a main body 423, and a bent portion 422. The connecting portion 421 is electrically connected to the stationary spring lead-out piece 41. The main body 423 is provided with a stationary contact 43. The bent portion 422 is disposed between the connecting portion 421 and the main body 423, and a preset gap is provided between the main body 423 and the stationary spring lead-out piece 41. Specifically, the connecting portion 421 is located above the main body 423, and the length of the connecting portion 421 is much smaller than the length of the main body 423. The bent portion 422 is inclined. The connecting portion 421 is specifically connected to the top of the stationary spring lead-out piece 41 by riveting. The stationary spring 42 is a thin rigid sheet with a thickness less than that of the stationary spring lead-out piece 41, making the stationary spring 42 relatively rigid and preventing deformation during the overtravel stage of the contact closure process. Therefore, the length of the stationary spring 42 can be made very short to meet the requirements of overall product miniaturization.

[0037] As a preferred embodiment, the elastic element 32 is sheet-shaped, and therefore can also be called an elastic sheet. The elastic element 32 is made of stainless steel, possessing characteristics such as high strength, weak conductivity, and high temperature resistance. After the contacts are closed, the elastic element 32 undergoes elastic deformation, generating OT (overtravel) and dynamic contact pressure. The conductive sheet 31 is rigid and adopts a flat, non-bending structure, making it easier to achieve synchronization between the two moving contacts 33. Furthermore, the rigidity of the conductive sheet 31 increases its current-carrying capacity. The armature portion 21 is roughly L-shaped and is integrally injection molded from the armature 211, connecting piece 213, and plastic part 212. This ensures good dimensional stability, facilitates large-scale production, maintains stable quality, eliminates the problem of insertion debris during assembly, and uses high-temperature resistant materials, resulting in stable high-temperature performance. The connecting piece 213 is made of metal and is separated from the armature by the plastic part 212. The connecting piece 213 corresponds to one side of the L-shape and extends downwards to be riveted and fixed to the elastic element. The coil frame of the magnetic circuit system 2 is vertical, and the armature is oscillatingly mounted above the coil frame, with a restoring spring 22 providing reset. One side of the armature portion 21 (i.e., the connecting piece 213) and the conductive piece 31 are connected to the same side of the elastic member 32, and there is a preset distance between the one side of the armature portion (i.e., the connecting piece 213) and the conductive piece 31. By controlling the size of this preset distance, the magnitude of the overtravel (OT) and the dynamic engagement pressure generated by the elastic deformation of the elastic member 32 can be controlled.

[0038] In this embodiment, there are multiple contact units arranged side by side. Specifically, there are two contact units, but it is not limited to this. Therefore, the present invention has four stationary spring parts 4 and two moving spring parts 3, forming two sets of bridge-type contact structures. Correspondingly, there are two connecting pieces 213 of the armature part 21, which are arranged side by side and correspond one-to-one with the elastic elements 32 of the two moving spring parts 3. Figure 6 As shown, in one contact unit, the two stationary spring leads 41 are bent to form a first lead 411 and a second lead 412 passing through the base 1. In the other contact unit, the two stationary spring leads 41 are bent to form a third lead 413 and a fourth lead 414 passing through the base 1. The first lead 411 and the second lead 412 protrude towards the side of the stationary spring portion 4 facing the moving spring portion 3, and are located at both ends of the contact system in the arrangement direction of its two contact units. The third lead 413 and the fourth lead 414 protrude towards the side of the stationary spring portion 4 opposite to the moving spring portion 3, and are located at both ends of the contact system in the arrangement direction of its two contact units. This allows the invention to maximize the air gap between leads in the same group and the air gap and creepage distance between leads in different groups while maintaining miniaturization.

[0039] like Figures 8-11 As shown, the base 1 has a first isolation wall 11 between the two stationary spring portions 4 of each contact unit. The top of the first isolation wall 11 is higher than the top of the stationary spring portion 4, and the side of the first isolation wall 11 facing the moving spring portion 3 protrudes from the stationary contact point 43, so that the air gap between the two stationary spring portions 4 of each contact unit is ≥3.6mm. The air gap between the two stationary spring portions 4 of each contact unit is... Figure 9 The sum of the lengths of the three dashed lines a, b, and c. The contact gap between the moving contact 33 and the stationary contact 43 in the open state is ≥1.8mm, and the thickness of the moving contact 33 is greater than the thickness of the stationary contact 43 to better ensure that the contact gap between the two stationary spring portions 4 of each contact unit is ≥3.6mm. After the moving contact 33 and the stationary contact 43 are closed, the distance L between the first isolation wall 11 and the conductive sheet 31 is ≥0.5mm, thereby preventing interference between the first isolation wall 11 and the conductive sheet 31 after the contact is consumed.

[0040] like Figure 2 , Figures 8-11 As shown, the base 1 has a second isolation wall 12 between adjacent contact units, the top of which is higher than the top of the stationary spring portion 4. The upstream portion of the third lead-out portion 413 is an extension portion 415 extending along the arrangement direction. The extension portion 415 is located on the side of the two stationary spring portions 4 of one of the contact units that are opposite to the moving spring portion 3. The base 1 has a third isolation wall 13 between the extension portion 415 and the two stationary spring portions 4 of one of the contact units. The third isolation wall 13 supports the first isolation wall 11 and the second isolation wall 12 and forms a support back plate for the two stationary spring lead-out pieces 41 of one of the contact units.

[0041] like Figure 3 As shown, the present invention also includes an auxiliary contact assembly, which includes an auxiliary moving spring 5 and an auxiliary stationary spring 6 mounted on the base 1 and cooperating with each other. The auxiliary moving spring 5 is driven by the armature part 21. The state of the auxiliary contact assembly is opposite to the state of the contact system. That is, when the contact system is in the contact closed state, the auxiliary contact assembly is in the contact open state, and when the contact system is in the contact open state, the auxiliary contact assembly is in the contact closed state.

[0042] The present invention provides an electromagnetic relay resistant to short-circuit current, which forms two sets of normally open bridge contacts. The two sets of bridge contacts are in a straight line on the horizontal plane, and there is a great isolation effect between the two sets. In each stationary spring section 4, the current flows in opposite directions on the stationary spring lead-out piece 41 and the stationary spring piece 42, forming a U-shaped loop. When a short-circuit current comes in, a Holm force is generated on the surfaces of the moving contact 33 and the stationary contact 43 due to the contraction of the current. The Holm force causes the moving and stationary contacts 43 to repel each other and generate an electric arc, resulting in contact erosion and sticking. At this time, the current flows in opposite directions on the stationary spring lead-out piece 41 and the stationary spring piece 42, and a Lorentz force (i.e., electrodynamic force) is generated between the stationary spring lead-out piece 41 and the stationary spring piece 42 towards the moving spring section 3. Since the stationary spring lead-out piece 41 is fixed on the base 1 and the stationary spring piece 42 is in a cantilever beam state, the stationary spring piece 42 will undergo a certain elastic deformation towards the moving spring section 3, which rapidly increases the contact pressure, thereby overcoming the harm of the Holm force and preventing the moving contact 33 and the stationary contact 43 from being repelled under short-circuit current, thus avoiding contact sticking. Specifically, when a short-circuit current of 1500A is generated, the deformation of the stationary spring 42 is approximately 0.09mm. Under normal rated load current operation, the stationary spring 42 does not deform. Therefore, under normal operating conditions, the stationary spring part 4 only needs to perform the function of resisting short-circuit current, while the moving spring part 3 provides OT (overtravel) and dynamic engagement pressure. The moving spring part 3 is directly driven by the armature part 21, thus eliminating the need for additional transmission components and allowing the stationary spring 42 to be made very short. This makes the invention suitable for electromagnetic relays with a compact structure and small size, thereby facilitating product miniaturization. Furthermore, the moving spring part 3 includes a rigid conductive sheet and an elastic element made of stainless steel, satisfying requirements for high current carrying capacity, high strength, and high temperature resistance, while also generating OT (overtravel) and dynamic engagement pressure.

[0043] This invention, through the above design, can achieve a 35A load with two sets of normally open contacts. The gap between contacts in the same set can reach 3.6mm, and the two sets of main contacts are isolated from each other, meeting the requirements of 1500A (@16A) in IEC 62752 and 3000A (@16A) + 500A short-circuit current for live and neutral wires in IEC 62955. The air gap and creepage distance between the contacts and the coil can both reach more than 10mm.

[0044] The present invention provides an electromagnetic relay resistant to short-circuit current. The parts not described herein are the same as or can be implemented using existing technologies.

[0045] The above embodiments are only used to further illustrate an electromagnetic relay that resists short-circuit current according to the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. An electromagnetic relay resistant to short-circuit current, comprising a magnetic circuit system and a contact system, wherein the wiring system includes at least one contact unit, the contact unit comprising a moving spring portion and two stationary spring portions arranged side by side, the moving spring portion being disposed on the armature portion of the magnetic circuit system and cooperating with the two stationary spring portions; characterized in that: Each stationary spring section includes a stationary spring lead-out piece and a stationary spring piece. One end of the stationary spring piece is electrically connected to the stationary spring lead-out piece, and the other end of the stationary spring piece is provided with a stationary contact. The current flow direction of the stationary spring piece and the stationary spring lead-out piece is opposite. The moving spring section includes a conductive piece and an elastic element. The elastic element is connected to the armature section, and the conductive piece is connected to the elastic element. Moving contacts are respectively provided on the conductive piece at the positions corresponding to the stationary contacts of the two stationary spring sections. The stationary spring is a thin rigid sheet with a thickness smaller than that of the stationary spring lead-out sheet, and it will not deform during the overtravel stage of the contact closure process; when a short-circuit current occurs, the stationary spring will undergo a certain elastic deformation toward the moving spring part, so that the moving contact and the stationary contact will not be repelled under the short-circuit current.

2. The electromagnetic relay with short-circuit current protection according to claim 1, characterized in that: The armature portion is L-shaped, one side of the armature portion and the conductive sheet are connected to the same side of the elastic element, and there is a preset distance between one side of the armature portion and the conductive sheet.

3. The electromagnetic relay with short-circuit current protection according to claim 1, characterized in that: The stationary spring lead-out sheet and the stationary spring sheet form a U-shaped or V-shaped circuit; the elastic element is sheet-shaped and made of stainless steel, and the conductive sheet is rigid.

4. The electromagnetic relay with short-circuit current protection according to claim 1, characterized in that: It also includes a base, on which the magnetic circuit system and the stationary spring lead-out piece are disposed; the base is provided with a first isolation wall between the two stationary spring parts, the top of the first isolation wall is higher than the top of the stationary spring part, and the side of the first isolation wall facing the moving spring part protrudes from the stationary contact point, so that the air gap between the two stationary spring parts is ≥3.6mm.

5. The electromagnetic relay with short-circuit current protection according to claim 4, characterized in that: The contact gap between the moving contact and the stationary contact in the open state is ≥1.8 mm, and the thickness of the moving contact is greater than the thickness of the stationary contact.

6. The electromagnetic relay with short-circuit current protection according to claim 4, characterized in that: After the moving contact and the stationary contact are closed, the distance between the first isolation wall and the conductive sheet is ≥0.5mm.

7. The electromagnetic relay with short-circuit current protection according to claim 1, characterized in that: The number of contact units is multiple, and the multiple contact units are arranged side by side; it also includes a base, on which the magnetic circuit system and the static spring lead-out piece are disposed; the base is provided with a second isolation wall between adjacent contact units, and the top of the second isolation wall is higher than the top of the static spring part.

8. The electromagnetic relay with short-circuit current protection according to claim 7, characterized in that: The number of contact units is two. In one contact unit, the two stationary spring leads are bent to form a first lead-out portion and a second lead-out portion passing through the base in sequence. In the other contact unit, the two stationary spring leads are bent to form a third lead-out portion and a fourth lead-out portion passing through the base in sequence. The first lead-out portion and the second lead-out portion protrude toward the side of the stationary spring portion facing the moving spring portion, and the first lead-out portion and the second lead-out portion are located at both ends of the contact system in the arrangement direction of its two contact units. The third lead-out portion and the fourth lead-out portion protrude toward the side of the stationary spring portion away from the moving spring portion, and the third lead-out portion and the fourth lead-out portion are located at both ends of the contact system in the arrangement direction of its two contact units.

9. The electromagnetic relay with short-circuit current protection according to claim 8, characterized in that: The upstream portion of the third or fourth lead-out portion is an extension portion extending along the arrangement direction. This extension portion is located on the side of the two stationary spring portions of one of the contact units that are opposite to the moving spring portion. The base is provided with a third isolation wall between the extension portion and the two stationary spring portions of one of the contact units.

10. The electromagnetic relay with short-circuit current protection according to claim 1, characterized in that: It also includes an auxiliary contact assembly, which includes an auxiliary moving spring and an auxiliary stationary spring that cooperate with each other. The auxiliary moving spring is driven by the armature portion, and the state of the auxiliary contact assembly is opposite to the state of the contact system.

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