CN221783139U - Electromagnetic relays with short-circuit current resistance - Google Patents

Abstract

The utility model discloses an electromagnetic relay resistant to short-circuit current, which comprises at least one contact unit, wherein the contact unit comprises a movable spring part and a static spring part which are mutually matched, the static spring part comprises a static spring leading-out sheet and a static spring main body, one end of the static spring main body is electrically connected with the static spring leading-out sheet, the other end of the static spring main body is provided with a static contact, and the current flowing directions of the static spring main body and the static spring leading-out sheet are opposite; the static spring main body comprises a plurality of flexible static spring pieces which are connected together in a superposition manner along the thickness direction of the flexible static spring pieces. The current carrying capacity of the static spring main body can meet the requirement, and the static spring main body has proper flexibility without being longer, so that the static spring main body can be shorter, and the utility model is suitable for electromagnetic relays with compact structures and small volumes. In particular, 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.

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. Therefore, in the prior art, an electromagnetic relay with a short-circuit current resisting function appears, at present, most of structures for short-circuit current resistance of the relay are arranged on a movable spring part, and a part of the relay is also provided with structures for short-circuit current resistance on a fixed spring part, so that the fixed spring part forms a U-shaped loop, a lorentz force facing the movable spring part is generated in a contact closing state, the lorentz force can resist the Hall force born by a fixed contact, and when the relay passes through the short-circuit current, the fixed contact and the movable contact are not easy to repel each other, thereby improving the short-circuit current resisting capability of the relay. 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 assembly difficulty of the structure, but is not suitable for electromagnetic relays with compact structures and small volumes. This is because: the static reed of the static reed part is of a single-piece structure, so that the static reed cannot be made to be too thin for having certain current carrying capacity, but the static reed also has to have certain flexibility so as to meet the short-circuit current resistance function, and even realize the contact overstroke function, so that the static reed needs to be made to be longer and even higher than a magnetic circuit system so as to have proper flexibility. The size of the relay in the length direction of the static reed is larger because the static reed is made longer, so that the miniaturization of the product is not facilitated. In addition, under the condition that a plurality of groups of contacts exist, a certain air gap and a creepage distance are required between the contacts of different groups, and under the condition that the height of the relay is unchanged, if the static reed is designed to be longer, the design of a separation wall between the contacts of adjacent groups is inconvenient, so that the air gap and the creepage distance between the contacts of different groups 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 current carrying capacity and flexibility of a static reed to be made shorter on the basis of realizing the short-circuit current resistance, 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 for resisting short-circuit current comprises at least one contact unit, wherein the contact unit comprises a movable spring part and a static spring part which are matched with each other, the static spring part comprises a static spring leading-out sheet and a static spring main body, one end of the static spring main body is electrically connected with the static spring leading-out sheet, the other end of the static spring main body is provided with a static contact, and the current flowing direction of the static spring main body is opposite to that of the static spring leading-out sheet; the static spring main body comprises a plurality of flexible static spring pieces which are connected together in a superposition manner along the thickness direction of the flexible static spring pieces.

Further, the movable spring part comprises a rigid movable spring and a movable contact arranged on the movable spring, and the static spring main body realizes the overtravel and the closing pressure of the contact through deformation after the movable contact contacts with the static contact.

Further, the static spring leading-out sheet and the static spring main body form a U-shaped or V-shaped loop; the static spring main body is provided with at least one through hole positioned between two ends of the static spring main body, and the through hole is in a strip shape and extends along the length direction of the static spring main body.

Further, the contact unit comprises two static spring parts which are arranged side by side, the moving spring part is arranged on an armature part of the magnetic circuit, and moving contacts are respectively arranged at positions of the moving spring part corresponding to the static contacts of the two static spring parts; the movable reed of the movable reed part adopts a rigid flat sheet type to ensure the synchronism of each movable contact thereon.

Further, the magnetic circuit system and the static spring leading-out piece are respectively arranged on the base, a first isolation wall is arranged 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, which faces 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, a contact gap between the movable contact of the movable spring part and the stationary contact in an open state is more than or equal to 1.8mm, and the thickness of the movable contact is larger than that of the stationary contact; after the movable contact and the fixed contact are closed, the distance between the first isolation wall and the movable spring part is more than or equal to 0.5mm; and the movable spring part is provided with a yielding hole corresponding to the first partition wall.

Further, 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 piece are respectively 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.

Further, the number of the contact units is two, the contact units comprise two static spring parts which are arranged side by side, wherein 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, 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, the upstream part of the third extraction part or the fourth extraction 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 part and two static spring parts of one contact unit.

Further, an auxiliary contact assembly is provided, the auxiliary contact assembly comprises an auxiliary movable spring plate and an auxiliary static spring plate which are 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. the static spring main body comprises a plurality of flexible static spring pieces which are overlapped and connected together along the thickness direction, so that the current carrying capacity of the static spring main body can meet the requirement, and the static spring main body has proper flexibility without being longer, so that the static spring main body can be shorter, and the static spring main body is suitable for an electromagnetic relay with a compact structure and a small 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 movable spring part comprises a rigid movable spring and a movable contact arranged on the movable spring, and the movable spring main body realizes the overtravel and the movable closing pressure of the contact through deformation after the movable contact is contacted with the movable contact, so that the movable spring part has the function of resisting short-circuit current, also has the function of realizing the overtravel and the movable closing pressure of the contact, and also has simpler structure and easy processing and assembly.

3. 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.

4. 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.

5. 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, 22, a restoring spring, 3, a moving spring part, 31, a moving spring, 311, a yielding hole, 32, a moving contact, 4, a static spring part, 41, a static spring leading-out sheet, 411, a first leading-out part, 412, a second leading-out part, 413, a third leading-out part, 414, a fourth leading-out part, 415, an extension part, 42, a flexible static spring, 421, a connecting part, 422, a bending part, 423, a main body part, 424, a through hole, 43, a static contact, 5, an auxiliary moving spring, 6 and an auxiliary static spring.

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", etc. are used based on the directions or positional relationships shown in the drawings, only for convenience of describing the present utility model, and are not intended to indicate or imply that the apparatus must have a specific direction, be constructed 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, may be 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, the electromagnetic relay for resisting short-circuit current of the present utility model includes a base 1, a magnetic circuit system 2 disposed on the base 1, and at least one contact unit, wherein the contact unit includes a movable spring portion 3 and a static spring portion 4 that are mutually matched, the static spring portion 4 includes a static spring lead-out piece 41 and a static spring main body, the static spring lead-out piece 41 is disposed on the base 1, one end of the static spring main body is electrically connected with the static spring lead-out piece 41, the other end of the static spring main body is provided with a static contact 43, and the current flowing directions of the static spring main body and the static spring lead-out piece 41 are opposite, specifically, the static spring lead-out piece 41 and the static spring main body form a U-shaped or V-shaped loop. The static spring body includes a plurality of flexible static springs 42, and the plurality of flexible static springs 42 are stacked and connected together in a thickness direction thereof. Specifically, the two ends of the plurality of flexible static springs 42 are respectively riveted and fixed, but the fixing method is not limited thereto. In the present embodiment, the number of the flexible static springs 42 is specifically three, but is not limited thereto.

In this embodiment, the movable spring part 3 includes a movable spring 31 having rigidity and a movable contact 32 provided on the movable spring 31, and the stationary spring body is deformed to achieve a contact overstroke and a movable contact pressure after the movable contact 32 and the stationary contact 43 are in contact. Therefore, the static spring part of the utility model not only has the function of resisting short-circuit current, but also can realize the overtravel and dynamic pressure of the contact.

As shown in fig. 5, each flexible 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 specifically connected to the top of the static spring lead-out tab 41 by riveting, and the main body portion 423 is riveted to the static contact 43, so that the connecting portion 421 is riveted to the static spring lead-out tab 41, and the main body portion 423 is riveted to the static contact 43, and simultaneously, a plurality of (specifically, three) flexible static springs 42 are riveted and fixed. As shown in fig. 6, the stationary spring body is provided with at least one through hole 424 between both ends thereof, and in particular, the number of through holes 424 is one, but not limited thereto. The through hole 424 is elongated and extends along the length direction of the static spring body, and since the static spring body is overlapped and connected by a plurality of flexible static spring pieces 42, the through hole 424 is provided on each flexible static spring piece 42. The provision of the through hole 424 can further enhance the flexibility of the stationary spring body.

In this embodiment, the contact unit includes two fixed spring portions 4 arranged side by side, the movable spring portion 3 is disposed on the armature portion 21 of the magnetic circuit system 2, and the movable contacts 32 are respectively disposed at positions of the movable spring portion 3 corresponding to the fixed contacts 43 of the two fixed spring portions 4. The movable reed 31 of the movable reed part 3 is not bent by adopting a flat sheet structure, so that the synchronism of the two movable contacts 32 on the movable reed part is easier to realize, and the movable reed 31 is rigid, so that the current carrying capacity of the movable reed is larger. The movable spring 31 has a substantially inverted T-shape, and has an upper end provided at the armature portion 21 and a lower end provided with movable contacts 32, respectively.

The armature portion 21 includes an armature 211, the armature 211 is generally L-shaped, one side of which is fitted to one end of the core of the magnetic circuit system 21, the other side of which is integrally insert-molded with the plastic member 212 and the movable spring 31, and the armature 211 and the movable spring 31 are separated by the plastic member 212. The coil frame of the magnetic circuit system 2 is vertical, and the armature 211 is swingably fitted over the coil frame and provides reset by using the reset spring 22.

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. The movable springs 31 of the two movable spring portions 3 are arranged side by side. As shown in fig. 6, two static spring lead-out pieces 41 of one contact unit are sequentially formed through bending to pass through a first lead-out portion 411 and a second lead-out portion 412 of the base 1, two static spring lead-out pieces 41 of the other contact unit are sequentially formed through bending to pass through a third lead-out portion 413 and a fourth lead-out portion 414 of the base 1, 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 32 and the stationary contact 43 in the disconnected state is not less than 1.8mm, and the thickness of the movable contact 32 is larger than that of the stationary contact 43 so as to ensure that the contact gap between the two stationary spring parts 4 of each contact unit is not less than 3.6mm. After the movable contact 32 and the fixed contact 43 are closed, the distance L between the first partition wall 11 and the movable reed 31 is more than or equal to 0.5mm, so that interference between the first partition wall 11 and the movable reed 31 after contact consumption can be prevented. Further, the movable spring portion 3 is provided with a relief hole 311 corresponding to the first partition wall 11, specifically, the relief hole 311 is disposed on the movable spring 31, and the relief hole 311 is elongated and extends vertically. The setting of hole 311 of stepping down can further dodge first partition wall 11 to avoid moving reed 31 and first partition wall 11 to take place to interfere after the contact is closed, also further prevent that the interference from appearing between first partition wall 11 and the moving reed 31 after the contact consumption.

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 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 state of the auxiliary contact assembly being opposite to the state of the contact unit, i.e., the auxiliary contact assembly being in a contact-open state when the contact unit is in a contact-closed state, and the auxiliary contact assembly being in a contact-closed state when the contact unit 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, the current flow direction of the static spring leading-out sheet 41 and the current flow direction of the flexible static spring sheet 42 are just opposite to form a U-shaped loop, when the short circuit current comes, the surfaces of the movable contact 32 and the static contact 43 generate Hall force due to the contraction current, and the Hall force can lead the actuation and the repulsion of the static contact 43 to generate electric arcs, so that the contact is ablated and stuck; at this time, the current flow directions of the static spring leading-out sheet 41 and the flexible static spring sheet 42 are opposite, a lorentz force (i.e. electromotive force) towards the movable spring part 3 is generated between the static spring leading-out sheet 41 and the flexible static spring sheet 42, and the flexible static spring sheet 42 is in a cantilever beam state because the static spring leading-out sheet 41 is fixed on the base 1, so that the flexible static spring sheet 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 32 and the static contact 43 can not be repelled under the short circuit current, and further the contact sticking is avoided. Further, after the movable contact 32 and the stationary contact 43 are brought into contact, each flexible stationary reed 42 of the stationary spring portion 4 provides OT (over stroke) and a closing pressure by elastic deformation. Therefore, under the normal working state, the static spring part 4 of the utility model not only can realize the function of resisting short-circuit current, but also can provide OT (over travel) and dynamic closing pressure. In addition, the static spring main body comprises a plurality of flexible static spring pieces 42, the current carrying capacity of the static spring main body can meet the requirement, and the static spring main body has proper flexibility without being longer, so that the static spring main body can be shorter, the utility model is suitable for an electromagnetic relay with a compact structure and a smaller volume, and further the utility model is beneficial to realizing the miniaturization design of products.

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 for resisting short-circuit current comprises at least one contact unit, wherein the contact unit comprises a movable spring part and a static spring part which are matched with each other, the static spring part comprises a static spring leading-out sheet and a static spring main body, one end of the static spring main body is electrically connected with the static spring leading-out sheet, the other end of the static spring main body is provided with a static contact, and the current flowing direction of the static spring main body is opposite to that of the static spring leading-out sheet; the method is characterized in that: the static spring main body comprises a plurality of flexible static spring pieces which are connected together in a superposition manner along the thickness direction of the flexible static spring pieces.

2. The short-circuit current resistant electromagnetic relay of claim 1, wherein: the movable spring part comprises a rigid movable spring and a movable contact arranged on the movable spring, and the static spring main body realizes the overtravel and the closing pressure of the contact through deformation after the movable contact contacts with the static contact.

3. The short-circuit current resistant electromagnetic relay of claim 1, wherein: the static spring leading-out sheet and the static spring main body form a U-shaped or V-shaped loop; the static spring main body is provided with at least one through hole positioned between two ends of the static spring main body, and the through hole is in a strip shape and extends along the length direction of the static spring main body.

4. The short-circuit current resistant electromagnetic relay of claim 1, wherein: the contact unit comprises two static spring parts which are arranged side by side, the movable spring part is arranged on an armature part of the magnetic circuit, and movable contacts are respectively arranged at positions of the movable spring part corresponding to the static contacts of the two static spring parts; the movable reed of the movable reed part adopts a rigid flat sheet type to ensure the synchronism of each movable contact thereon.

5. The short-circuit current resistant electromagnetic relay of claim 4 wherein: the magnetic circuit system and the static spring leading-out sheet are respectively arranged on the base, a first isolation wall is arranged 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, which faces 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.

6. The short-circuit current resistant electromagnetic relay of claim 5 wherein: the contact gap between the movable contact of the movable spring part and the stationary 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 stationary contact; after the movable contact and the fixed contact are closed, the distance between the first isolation wall and the movable spring part is more than or equal to 0.5mm; and the movable spring part is provided with a yielding hole corresponding to the first partition wall.

7. The short-circuit current resistant electromagnetic relay according to any one of claims 1 to 3, 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 piece are respectively 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, the contact units comprise two static spring parts which are arranged side by side, wherein 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, 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.

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 part and two static spring parts of one contact unit.

10. The short-circuit current resistant electromagnetic relay of claim 4 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.