CN221125832U - Electromagnetic relay resistant to short-circuit current - Google Patents

Abstract

The utility model discloses an electromagnetic relay resistant to short-circuit current, which comprises a magnetic circuit system and at least one contact unit, wherein the contact unit comprises a movable spring part and two static spring parts which are arranged side by side, and the movable spring part is arranged on an armature part of the magnetic circuit system and is matched with the two static spring parts; each static spring part comprises a static spring leading-out sheet and a static spring sheet, one end of the static spring sheet is electrically connected with the static spring leading-out sheet, the other end of the static spring sheet is provided with a static contact, and the current flowing directions of the static spring sheet and the static spring leading-out sheet are opposite; the movable spring part comprises a conductive sheet and an elastic piece, the elastic piece is connected to the armature part, the conductive sheet is connected to the elastic piece, and movable contacts are respectively arranged on the conductive sheet and at positions corresponding to the fixed contacts of the two fixed spring parts. The utility model can make the static reed shorter, so that the utility model is suitable for electromagnetic relay with compact structure and small volume.

Description

Electromagnetic relay resistant to short-circuit current

Technical Field

The utility model relates to the technical field of relays, in particular to an electromagnetic relay resistant to short-circuit current.

Background

The relay is an automatic switching element with an isolation function, is widely applied to household appliances, remote control, remote measurement, communication, automatic control, electromechanical integration and power electronic equipment, is one of the most important control elements, and plays roles of automatic adjustment, safety protection, a switching circuit and the like in a control circuit.

The traditional electromagnetic relay has low short-circuit current resistance, and when short-circuit current passes, contacts are easily repelled under the action of Hall force, so that the contacts are opened or the bonding of the contacts is invalid. For this reason, in the prior art, an electromagnetic relay with a short-circuit current resistance function appears, and at present, most of structures for short-circuit current resistance of the relay are arranged on a movable spring part, and additional transmission components (such as a push card) are required to be added, so that not only are costs and difficulty in assembling the structure increased, but also the relay is not suitable for an electromagnetic relay with a compact structure and a small volume. Some relays are also provided with a structure for resisting short-circuit current on the static spring part, so that the static spring part forms a U-shaped loop, and Lorentz force towards the movable spring part is generated in a contact closed state and can resist the Hall force born by the static contact, so that the static contact and the movable contact are not easy to repel when the relay passes through short-circuit current, and the capability of resisting short-circuit current of the relay is improved. The relay with the structure for resisting short-circuit current arranged on the static spring part does not need to adopt an additional transmission part, is beneficial to reducing the cost and the structure assembly difficulty, but is still not suitable for electromagnetic relays with compact structures and small volumes. This is because: besides the function of short-circuit current resistance, the static spring part also has the function of realizing the overtravel of the contact, so that the static spring of the static spring part needs to be made longer and even higher than a magnetic circuit system, has better flexibility and can deform after the contact. The size of the relay in the length direction of the static reed is larger by making the static reed longer, so that miniaturization of the product is not utilized. In addition, when there are multiple sets of contacts, a certain air gap and creepage distance are required between the different sets of contacts, and when the height of the relay is unchanged, if the static spring leading-out sheet and the static spring are designed to be longer, the air gap and creepage distance between the different sets are insufficient.

Disclosure of utility model

Aiming at the technical problems existing in the prior art, the utility model provides an electromagnetic relay resistant to short-circuit current, which enables the length of a static reed to be made shorter on the basis of realizing short-circuit current resistance and contact overstroke, thereby being beneficial to miniaturization of products and being more convenient for meeting the standard requirements of air gaps and creepage distances among different groups under the condition that the products are provided with a plurality of groups of contacts.

The technical scheme adopted for solving the technical problems is as follows: an electromagnetic relay resistant to short-circuit current comprises a magnetic circuit system and at least one contact unit, wherein the contact unit comprises a movable spring part and two static spring parts which are arranged side by side, and the movable spring part is arranged on an armature part of the magnetic circuit system and is matched with the two static spring parts; each static spring part comprises a static spring leading-out sheet and a static spring sheet, one end of the static spring sheet is electrically connected with the static spring leading-out sheet, the other end of the static spring sheet is provided with a static contact, and the current flowing directions of the static spring sheet and the static spring leading-out sheet are opposite; the movable spring part comprises a conductive sheet and an elastic piece, the elastic piece is connected to the armature part, the conductive sheet is connected to the elastic piece, and movable contacts are respectively arranged on the conductive sheet and at positions corresponding to the fixed contacts of the two fixed spring parts.

Furthermore, the armature part is L-shaped, one side of the armature part and the conducting plate are connected to the same side of the elastic piece, and a preset distance is reserved between one side of the armature part and the conducting plate.

Further, the static reed is a thin rigid sheet with the thickness smaller than that of the static reed leading-out sheet, and the static reed leading-out sheet and the static reed form a U-shaped or V-shaped loop; the elastic piece is sheet-shaped, the elastic piece is made of stainless steel, and the conductive piece is rigid.

Further, the base is provided with a first isolation wall between the two static spring parts, the top end of the first isolation wall is higher than the top end of the static spring part, and one side of the first isolation wall facing the movable spring part protrudes out of the static contact, so that an air gap between the two static spring parts is more than or equal to 3.6mm.

Further, the contact gap between the movable contact and the stationary contact in the disconnection state is more than or equal to 1.8mm, and the thickness of the movable contact is larger than that of the stationary contact.

Further, after the movable contact and the stationary contact are closed, the distance between the first isolation wall and the conducting strip is more than or equal to 0.5mm.

Further, the number of the contact units is a plurality, and the contact units are arranged side by side; the base is provided with a second partition wall between adjacent contact units, and the top end of the second partition wall is higher than the top end of the static spring part.

Further, the number of the contact units is two, wherein the two static spring leading-out sheets of one contact unit sequentially form a first leading-out part and a second leading-out part which penetrate through the base through bending, the two static spring leading-out sheets of the other contact unit sequentially form a third leading-out part and a fourth leading-out part which penetrate through the base through bending, the first leading-out part and the second leading-out part respectively protrude towards one side of the static spring part facing the movable spring part, and the first leading-out part and the second leading-out part are respectively positioned at two ends of the contact system in the arrangement direction of the two contact units; the third leading-out part and the fourth leading-out part respectively protrude towards one side of the static spring part, which is opposite to the movable spring part, and the third leading-out part and the fourth leading-out part are respectively positioned at two ends of the contact system in the arrangement direction of the two contact units.

Further, an upstream portion of the third lead-out portion or the fourth lead-out portion is an extension portion extending along the arrangement direction, and the extension portion is located at one side of the two static spring portions of the one contact unit, which is opposite to the moving spring portion; the base is provided with a third partition wall between the extension portion and two static spring portions of one of the contact units.

Further, the auxiliary contact assembly comprises an auxiliary movable spring plate and an auxiliary static spring plate which are mounted on the base and matched with each other, the auxiliary movable spring plate is driven by the armature part, and the state of the auxiliary contact assembly is opposite to the state of the contact system.

Compared with the prior art, the utility model has the following beneficial effects:

1. Because the static spring part of the utility model comprises the static spring leading-out sheet and the static spring sheet, the static spring leading-out sheet is arranged on the base, one end of the static spring sheet is electrically connected with the static spring leading-out sheet, the other end of the static spring sheet is provided with the static contact, and the current flowing directions of the static spring sheet and the static spring leading-out sheet are opposite; the movable spring part comprises a conductive sheet and an elastic piece, wherein the elastic piece is connected to the armature part, the conductive sheet is connected to the elastic piece, and movable contacts are respectively arranged on the conductive sheet and correspond to the static contacts of the two static spring parts, so that the static spring part has a short-circuit current resisting function, the movable spring part is directly driven by the armature part, and after the movable contact is contacted with the static contacts, the function of realizing the contact overtravel can be realized by utilizing the elastic deformation of the elastic piece, so that the static spring part does not need to bear the function of realizing the contact overtravel. Therefore, the static reed of the utility model can be made shorter, so that the utility model is suitable for electromagnetic relays with compact structure and smaller volume. Particularly, the utility model is more convenient to meet the standard requirements of air gaps and creepage distances among different groups under the condition of having a plurality of groups of contacts (namely a plurality of contact units).

2. The base is provided with the first isolation wall between the two static spring parts of the contact unit, so that the contact gap between the same group can meet the basic insulation requirement on the basis of the miniaturized relay. Particularly, after the movable contact and the static contact are closed, the distance between the first isolation wall and the conducting strip is more than or equal to 0.5mm, so that interference between the first isolation wall and the conducting strip after the contact is consumed can be prevented.

3. According to the utility model, on the basis of a plurality of contact units, the second isolation wall/the third isolation wall are arranged on the base, so that different groups of contacts can be isolated from each other, and arc short circuit of more than 500A can be prevented. In particular, the number of the contact units is two, and the creepage distance and the air gap of different components can meet the requirement of reinforcing insulation through the layout design of the first lead-out part, the second lead-out part, the third lead-out part and the fourth lead-out part.

4. The utility model can realize the load of a plurality of groups of normally open contacts 35A, the gaps of the contacts in the same group can reach 3.6mm, the main contacts in adjacent groups are mutually isolated, the requirements of 1500A (@ 16A) in IEC 62752 and 3000A (@ 16A) +500A zero line short-circuit current in IEC 62955 are met, and the air gaps and creepage distances between the contacts and coils can reach more than 10 mm.

The utility model is described in further detail below with reference to the drawings and examples; the electromagnetic relay resistant to short-circuit current of the present utility model is not limited to the embodiment.

Drawings

FIG. 1 is a front view of the present utility model;

FIG. 2 is a left side view of the present utility model;

FIG. 3 is a right side view of the present utility model;

FIG. 4 is a schematic perspective view of the contact system of the present utility model in combination with an armature portion;

Fig. 5 is a front view of fig. 4;

FIG. 6 is a schematic perspective view of four static spring portions of the present utility model;

Fig. 7 is a schematic perspective view showing a combination of an armature portion and a moving spring portion according to the present utility model;

Fig. 8 is a cross-sectional view A-A of fig. 2 in a contact open state;

FIG. 9 is an enlarged schematic view of portion B of FIG. 8;

FIG. 10 is a cross-sectional view A-A of FIG. 2 in a contact closed state;

FIG. 11 is an enlarged schematic view of portion C of FIG. 10;

in the figure, 1, a base, 11, a first isolation wall, 12, a second isolation wall, 13, a third isolation wall, 2, a magnetic circuit, 21, an armature part, 211, an armature, 212, a plastic part, 213, a connecting piece, 22, a restoring reed, 3, a moving reed part, 31, a conducting piece, 32, an elastic part, 33, a moving contact, 4, a static reed part, 41, a static reed leading piece, 411, a first leading part, 412, a second leading part, 413, a third leading part, 414, a fourth leading part, 415, an extending part, 42, a static reed, 421, a connecting part, 422, a bending part, 423, a main body part, 43, a static contact, 5, an auxiliary moving reed, 6 and an auxiliary static reed.

Detailed Description

In the present disclosure, the terms "first," "second," and the like are used merely to distinguish between similar objects, and are not used to describe a particular sequence or order, nor are they to be construed as indicating or implying a relative importance. In the description, the directions or positional relationships indicated by "upper", "lower", "left", "right", "front", "rear", etc. are used for convenience of description of the present utility model based on the directions or positional relationships shown in the drawings, and are not meant to indicate or imply that the apparatus must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the scope of protection of the present utility model. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, in the description of the present utility model, unless otherwise indicated, "a plurality" means two or more. In the description of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, as for example, "connected," may be either fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, or indirectly connected through an intermediary, and may be in communication with the interior of two elements, as would be understood by one of ordinary skill in the art, and the terms are specifically defined in the present utility model.

Referring to fig. 1-11, an electromagnetic relay for resisting short-circuit current according to the present utility model includes a base 1, a contact system and a magnetic circuit system 2 disposed on the base 1, wherein the contact system includes at least one contact unit, the contact unit includes a moving spring portion 3 and two static spring portions 4 disposed side by side, and the moving spring portion 3 is disposed on an armature portion 21 of the magnetic circuit system 2 and cooperates with the two static spring portions 4. Each static spring part 4 comprises a static spring leading-out piece 41 and a static spring piece 42, the static spring leading-out piece 41 is arranged on the base 1, one end of the static spring piece 42 is electrically connected with the static spring leading-out piece 41, the other end of the static spring piece 42 is provided with a static contact 43, the current flowing directions of the static spring piece 42 and the static spring leading-out piece 41 are opposite, and specifically, the static spring leading-out piece 41 and the static spring piece 42 form a U-shaped or V-shaped loop. The movable spring part 3 comprises a conductive sheet 31 and an elastic piece 32, the elastic piece 32 is connected to the armature part 21, the conductive sheet 31 is connected to the elastic piece 32, and the movable contacts 33 are respectively arranged on the conductive sheet 31 corresponding to the fixed contacts 43 of the two fixed spring parts 4.

As shown in fig. 5, the static reed 42 includes a connection portion 421, a main body portion 423, and a bending portion 422, the connection portion 421 is electrically connected to the static reed drawing piece 41, the main body portion 423 is provided with the static contact 43, the bending portion 422 is provided between the connection portion 421 and the main body portion 423, and a predetermined gap is provided between the main body portion 423 and the static reed drawing piece 41. Specifically, the connecting portion 421 is located above the main portion 423, and the length of the connecting portion 421 is much smaller than that of the main portion 423, and the bending portion 422 is inclined. The connecting portion 421 is connected to the top of the stationary spring lead-out tab 41 by riveting. The static reed 42 is a thin rigid sheet with the thickness of Yu Jing spring leading-out sheet 41, so that the static reed 42 is relatively rigid and cannot deform in the overtravel stage in the contact closing process. Thus, the length of the static spring 42 can be made short to accommodate the overall miniaturization of the product.

Preferably, the elastic member 32 is in the form of a sheet, and thus may also be referred to as an elastic sheet. The elastic member 32 is made of stainless steel and has the characteristics of good strength, weak conductivity, high temperature resistance and the like. After the contact is closed, the elastic member 32 elastically deforms to generate OT (over stroke) and an engaging pressure. The conductive sheet 31 is rigid and is not bent by adopting a flat sheet structure, so that the synchronism of the two movable contacts 33 on the conductive sheet is easier to realize, and the conductive sheet 31 is rigid, so that the current carrying capacity of the conductive sheet is larger. The armature part 21 is approximately L-shaped, and is formed by integrally inserting an armature 211, a connecting sheet 213 and a plastic piece 212 in an injection molding way, so that the size stability is good, the mass production is facilitated, the quality is stable, the problem of inserting burrs in the assembly process is avoided, the high-temperature resistant material is selected, and the high-temperature resistant performance of the product is stable. The connecting piece 213 is made of metal, and is separated from the armature by a plastic piece 212, and the connecting piece 213 corresponds to one side of the L shape, extends downwards and is riveted and fixed with the elastic piece. The coil frame of the magnetic circuit system 2 is vertical, the armature is swingably matched above the coil frame, and the restoring spring 22 is adopted to provide the restoration. One side of the armature portion 21 (i.e., the connecting piece 213) and the conductive piece 31 are connected to the same surface of the elastic member 32, and a preset distance is provided between one side of the armature portion (i.e., the connecting piece 213) and the conductive piece 31, and by controlling the preset distance, the elastic member 32 can be controlled to elastically deform to generate OT (over travel) and the magnitude of the actuation pressure.

In this embodiment, the number of the contact units is plural, and the plural contact units are arranged side by side. Specifically, the number of the contact units is two, but not limited thereto, and thus the present utility model shares four static spring portions 4 and two moving spring portions 3 to form two sets of bridge contact structures. Correspondingly, the number of the connecting pieces 213 of the armature portion 21 is two, and the two connecting pieces 213 are arranged side by side and correspond to the elastic pieces 32 of the two moving spring portions 3 one by one, respectively. As shown in fig. 6, two static spring lead-out pieces 41 of one contact unit are sequentially formed through a first lead-out portion 411 and a second lead-out portion 412 of the base 1 by bending, two static spring lead-out pieces 41 of the other contact unit are sequentially formed through a third lead-out portion 413 and a fourth lead-out portion 414 of the base 1 by bending, the first lead-out portion 411 and the second lead-out portion 412 respectively protrude toward one side of the static spring portion 4 facing the movable spring portion 3, and the first lead-out portion 411 and the second lead-out portion 412 are respectively located at both ends of the contact system in the arrangement direction of the two contact units thereof; the third and fourth lead-out portions 413 and 414 protrude toward the side of the stationary spring portion 4 facing away from the movable spring portion 3, respectively, and the third and fourth lead-out portions 413 and 414 are located at both ends of the contact system in the arrangement direction of the two contact units thereof, respectively. Therefore, on the basis of miniaturization, the utility model makes the air gap between the extraction parts of the same group as large as possible, and makes the air gap and creepage distance between the extraction parts of different groups as large as possible.

As shown in fig. 8-11, the base 1 is provided with a first partition wall 11 between two static spring parts 4 of each contact unit, the top end of the first partition wall 11 is higher than the top end of the Yu Jing spring part 4, and one side of the first partition wall 11 facing the moving spring part 3 protrudes out of the static contact 43, so that the air gap between the two static spring parts 4 of each contact unit is more than or equal to 3.6mm. The air gap between the two static spring portions 4 of each contact unit is the sum of the lengths of the three broken lines a, b, c in fig. 9. The contact gap between the movable contact 33 and the stationary contact 43 in the open state is not less than 1.8mm, and the thickness of the movable contact 33 is larger than that of the stationary contact 43 so as to more ensure that the contact gap between the two stationary spring portions 4 of each contact unit is not less than 3.6mm. After the movable contact 33 and the stationary contact 43 are closed, the distance L between the first partition wall 11 and the conductive sheet 31 is more than or equal to 0.5mm, so that interference between the first partition wall 11 and the conductive sheet 31 after contact consumption can be prevented.

As shown in fig. 2, 8 to 11, the base 1 is provided with a second partition wall 12 between adjacent contact units, and the top end of the second partition wall 12 is higher than the top end of the Yu Jing spring portion 4. An upstream portion of the third drawing portion 413 is an extension portion 415 extending in the arrangement direction, the extension portion 415 being located on a side of two of the stationary spring portions 4 of one of the contact units facing away from the movable spring portion 3; the base 1 is provided with a third partition wall 13 between the extension 415 and the two static spring portions 4 of one of the contact units, the third partition wall 13 bearing the first partition wall 11 and the second partition wall 12 and forming a supporting back plate of the two static spring lead-out pieces 41 of one of the contact units.

As shown in fig. 3, the present utility model further includes an auxiliary contact assembly including an auxiliary movable contact spring 5 and an auxiliary stationary contact spring 6 mounted to the base 1 and cooperating with each other, the auxiliary movable contact spring 5 being driven by the armature portion 21, the auxiliary contact assembly being in a state opposite to that of the contact system, i.e., the auxiliary contact assembly being in a contact-open state when the contact system is in a contact-closed state, and the auxiliary contact assembly being in a contact-closed state when the contact system is in a contact-open state.

The electromagnetic relay resistant to short-circuit current forms two groups of normally open bridge contacts, the two groups of bridge contacts are in a straight line on a horizontal plane, and the two groups have a great isolation effect. In each static spring part 4, from the current flow direction, the current flow direction on the static spring leading-out sheet 41 and the static spring sheet 42 is just opposite to form a U-shaped loop, when short circuit current comes, the surfaces of the movable contact 33 and the static contact 43 generate Hall force due to contraction current, and the Hall force can lead the actuation and the repulsion of the static contact 43 to generate electric arcs, so that contact ablation and sticking are caused; at this time, the current flow direction of the static spring lead-out piece 41 is opposite to that of the static spring piece 42, a lorentz force (i.e. electrodynamic force) towards the movable spring part 3 is generated between the static spring lead-out piece 41 and the static spring piece 42, and the static spring piece 42 is in a cantilever beam state because the static spring lead-out piece 41 is fixed on the base 1, so that the static spring piece 42 can generate certain elastic deformation towards the movable spring part 3, the contact pressure is rapidly increased, the harm of the Holmer force is overcome, the movable contact 33 and the static contact 43 can not be repelled under the short circuit current, and further the contact sticking is avoided. Specifically, when a 1500A short-circuit current is generated, the deformation amount of the static reed 42 is about 0.09mm, and the static reed 42 does not play a role in deformation during normal rated load current operation. Therefore, in the normal working state, the static spring part 4 only needs to realize the function of short-circuit current resistance, the movable spring part 3 provides OT (over travel) and movable closing pressure, and the movable spring part 3 is directly driven by the armature part 21, so that the utility model does not need to additionally arrange a transmission part, and the static spring 42 can be made very short, thereby being suitable for an electromagnetic relay with a compact structure and a smaller volume, and further being beneficial to realizing the miniaturization design of products. In addition, the movable spring part 3 comprises a rigid conductive sheet and an elastic piece made of stainless steel, and can generate OT (over travel) and dynamic pressure while meeting the requirements of larger current carrying capacity, high strength and high temperature resistance.

According to the utility model, through the design, the loads of two groups of normally open contacts 35A can be realized, the gaps of the same group of contacts can reach 3.6mm, the two groups of main contacts are mutually isolated, the requirements of 1500A (@16A) in IEC 62752 and 3000A (@16A) +500A zero firing line short-circuit current in IEC 62955 are met, and the air gaps and creepage distances between the contacts and coils can reach more than 10 mm.

The electromagnetic relay resistant to short-circuit current is not related to the electromagnetic relay, and parts of the electromagnetic relay are the same as or can be realized by adopting the prior art.

The above embodiment is only used for further illustrating an electromagnetic relay resistant to short-circuit current, but the utility model is not limited to the embodiment, and any simple modification, equivalent variation and modification of the above embodiment according to the technical substance of the utility model falls within the protection scope of the technical solution of the utility model.

Claims (10)

1. An electromagnetic relay resistant to short-circuit current comprises a magnetic circuit system and at least one contact unit, wherein the contact unit comprises a movable spring part and two static spring parts which are arranged side by side, and the movable spring part is arranged on an armature part of the magnetic circuit system and is matched with the two static spring parts; the method is characterized in that: each static spring part comprises a static spring leading-out sheet and a static spring sheet, one end of the static spring sheet is electrically connected with the static spring leading-out sheet, the other end of the static spring sheet is provided with a static contact, and the current flowing directions of the static spring sheet and the static spring leading-out sheet are opposite; the movable spring part comprises a conductive sheet and an elastic piece, the elastic piece is connected to the armature part, the conductive sheet is connected to the elastic piece, and movable contacts are respectively arranged on the conductive sheet and at positions corresponding to the fixed contacts of the two fixed spring parts.

2. The short-circuit current resistant electromagnetic relay of claim 1, wherein: the armature part is L-shaped, one side of the armature part and the conducting plate are connected to the same surface of the elastic piece, and a preset distance is reserved between one side of the armature part and the conducting plate.

3. The short-circuit current resistant electromagnetic relay of claim 1, wherein: the static reed is a thin rigid sheet with the thickness smaller than that of the static reed leading-out sheet, and the static reed leading-out sheet and the static reed form a U-shaped or V-shaped loop; the elastic piece is sheet-shaped, the elastic piece is made of stainless steel, and the conductive piece is rigid.

4. The short-circuit current resistant electromagnetic relay of claim 1, wherein: the magnetic circuit system and the static spring leading-out sheet are arranged on the base; the base is provided with a first isolation wall between the two static spring parts, the top end of the first isolation wall is higher than the top end of the static spring part, and one side of the first isolation wall facing the movable spring part protrudes out of the static contact, so that an air gap between the two static spring parts is more than or equal to 3.6mm.

5. The short-circuit current resistant electromagnetic relay of claim 4 wherein: the contact gap between the movable contact and the static contact in the disconnection state is more than or equal to 1.8 mm, and the thickness of the movable contact is larger than that of the static contact.

6. The short-circuit current resistant electromagnetic relay of claim 4 wherein: after the movable contact and the static contact are closed, the distance between the first isolation wall and the conducting strip is more than or equal to 0.5mm.

7. The short-circuit current resistant electromagnetic relay of claim 1, wherein: the number of the contact units is a plurality, and the contact units are arranged side by side; the magnetic circuit system and the static spring leading-out sheet are arranged on the base; the base is provided with a second partition wall between adjacent contact units, and the top end of the second partition wall is higher than the top end of the static spring part.

8. The short-circuit current resistant electromagnetic relay of claim 7 wherein: the number of the contact units is two, wherein the two static spring leading-out sheets of one contact unit sequentially form a first leading-out part and a second leading-out part which penetrate through the base through bending, the two static spring leading-out sheets of the other contact unit sequentially form a third leading-out part and a fourth leading-out part which penetrate through the base through bending, the first leading-out part and the second leading-out part respectively protrude towards one side of the static spring part facing the movable spring part, and the first leading-out part and the second leading-out part are respectively positioned at two ends of the two contact units in the arrangement direction; the third leading-out part and the fourth leading-out part respectively protrude towards one side of the static spring part, which is opposite to the movable spring part, and the third leading-out part and the fourth leading-out part are respectively positioned at two ends of the two contact units in the arrangement direction.

9. The short-circuit current resistant electromagnetic relay of claim 8 wherein: the upstream part of the third leading-out part or the fourth leading-out part is an extension part extending along the arrangement direction, and the extension part is positioned at one side of the two static spring parts of one contact unit, which is opposite to the movable spring part; the base is provided with a third partition wall between the extension portion and two static spring portions of one of the contact units.

10. The short-circuit current resistant electromagnetic relay of claim 1, wherein: and an auxiliary contact assembly including an auxiliary movable spring and an auxiliary static spring which are matched with each other, the auxiliary movable spring being driven by the armature portion, the state of the auxiliary contact assembly being opposite to the state of the contact unit.