Two-way magnetic latching relay with symmetrically distributed input and output and capable of improving short-circuit impact resistance

Abstract

The invention discloses a double-path magnetic latching relay with symmetrically distributed input and output and capable of improving short-circuit impact resistance, which structurally comprises three parts, namely a shell part, a control group loop part and a magnetic circuit system part, and is characterized in that the shell part consists of a shell, an upper cover and a lower cover; the control group loop branch comprises an L1 control group loop and an L2 control group loop. Each control group loop is composed of a movable contact, a movable reed, a movable reed seat, a static contact and a static reed seat. The magnetic circuit system part comprises a coil frame, an enameled wire, an iron core, a yoke, a support, a pushing piece and a magnetic steel assembly. The structure of the invention can solve the problem of poor short-circuit impact resistance of the magnetic latching relay with symmetrically distributed input and output.

Description

[Technical field]

[0001] The invention belongs to the technical field of relay equipment, and in particular relates to a dual-circuit magnetic latching relay with symmetrically distributed input and output for improving resistance to short-circuit impact. [Background technology]

[0002] In the era of rapid technological development, the country has invested huge human, material and financial resources in the construction of smart grids in recent years, making it a booming development. With the widespread application of a series of advanced technologies and the continuous improvement of infrastructure, smart grids have penetrated into all aspects of people's lives and brought many changes to the field of electricity consumption. The most significant is that the safety and reliability of electricity meters have been continuously improved, which not only ensures the stability of residents' electricity consumption, but also provides solid support for many electricity consumption scenarios such as industrial production.

[0003] Inside the smart meter, a key electricity metering device, there is a vital component - the magnetic latching relay, which shoulders the heavy responsibility of being a "traffic hub commander" and is a key link in achieving accurate and efficient circuit switching. Its performance is directly related to whether the entire smart meter can operate stably. For this reason, the magnetic latching relay must have excellent qualities, especially good short-circuit current resistance, in order to cope with emergencies that may occur at any time in the complex and changeable power environment, such as instantaneous current overload, short-circuit fault, etc., so as to effectively ensure the safety and smoothness of the power system.

[0004] The current common symmetrical magnetic latching relay products are designed to meet the symmetrical requirements of the structural layout, so as to achieve standardized production, convenient assembly and simplified maintenance. The specific structure is that the static spring seat of the L1 control group starts from the rear of the relay, bypasses the L1 control group and the magnetic system along a specific path, and is precisely located on the left side of the dynamic spring seat of the L2 control group. From the perspective of appearance and assembly process, this layout has indeed achieved the symmetrical structure expected in the early stage of the design, which is conducive to process control in large-scale production operations.

[0005] However, after an in-depth analysis of the electromagnetic principles and operating mechanisms within the product, it was found that since the static spring seat of the L2 control group surrounds the entire magnetic circuit system, according to the basic principles of electromagnetism, a magnetic field will be generated around the current-carrying conductor, and such a layout causes multiple magnetic fields to overlap and interfere with each other in a limited space. This complex and disordered magnetic field distribution greatly destroys the stability of the original magnetic flux path of the magnetic circuit system, causing the magnetic permeability to fluctuate and the magnetic resistance to increase significantly. Furthermore, when encountering a short-circuit current shock, the electromagnetic driving force inside the relay cannot respond in an ideal state, and problems such as delayed armature action and poor contact of contacts occur frequently, which ultimately leads to serious damage to its short-circuit shock resistance performance, making it difficult to meet strict short-circuit shock test standards such as UC2 and UC3, posing severe challenges to the high-reliability operation of smart meters. [Summary of the invention]

[0006] The present invention provides a dual-circuit magnetic latching relay with symmetrically distributed input and output for improving short-circuit impact resistance, so as to solve the problem of poor short-circuit impact resistance of the magnetic latching relay and effectively reduce the volume of the relay.

[0007] In order to achieve the above technical objectives, the design scheme of the present invention is as follows:

[0008] A dual-circuit magnetic latching relay with symmetrically distributed input and output for improving resistance to short-circuit impact, comprising three major parts, namely a housing part, a control group circuit part, and a magnetic circuit system part, wherein the housing part is composed of an outer shell, an upper cover, and a lower cover, wherein the outer shell is arranged between the upper cover and the lower cover;

[0009] The control group circuit part includes L1 control group circuit and L2 control group circuit. Each control group circuit consists of a moving contact, a moving spring seat, a moving spring piece, a static spring point and a static spring seat. The static contact is arranged on the static spring seat, the moving spring point is arranged on the moving spring piece, and the moving spring piece assembly is arranged on the moving spring seat.

[0010] The magnetic circuit system part includes a coil frame, a bracket, a pusher, a magnetic steel assembly, enameled wire, an iron core, and a yoke. The yoke is arranged on both sides of the coil frame, and the iron core is inserted in the middle. The magnetic steel assembly is arranged between the two yokes. The bracket is placed on the magnetic steel assembly. The enameled wire is wound on the coil frame. The pusher is designed with a slot, which is respectively inserted into the magnetic steel assembly and the control group circuit to connect the movable spring sheet in each control group to each other.

[0011] Furthermore, slots and cavities for positioning various components are designed inside the shell.

[0012] Furthermore, the static spring seat of the L1 control group and the dynamic spring seat of the L1 control group constitute the L1 control group, and the static spring seat of the L2 control group and the dynamic spring seat of the L2 control group constitute the L2 control group. The static spring seat of the L2 control group crosses from the front end below the static contact and the dynamic contact of the L1 control group to the left side of the dynamic spring seat of the L2 control group, forming a loop.

[0013] Furthermore, a segmented welding process is adopted in the middle circle of the static spring seat of the L2 control group, and two parts are welded together into one.

[0014] Furthermore, the number of movable springs in each control group is 3.

[0015] Furthermore, two of the moving reeds are made of red copper sheets, the middle right portion is designed in a U-shape, and one of the reeds has a bent head; the remaining moving reeds are made of beryllium copper material.

[0016] Furthermore, the magnetic steel assembly includes two armature pieces, a permanent magnet block and a plastic body, and the processing is as follows: the two armature pieces and the permanent magnet block are installed in an injection mold fixture, and then the injection molding process is started. After the injection molding is full, the plastic body wraps the two armature pieces and the permanent magnet block to form a whole.

[0017] Furthermore, the two armature pieces are made of DT4E material, the permanent magnet block is made of NdFeB material, and the plastic body is made of wear-resistant PBT material.

[0018] Furthermore, the coil combination consists of a coil frame, enameled wire, an iron core, and a yoke. The iron core and the yoke are made of DT4E material. The enameled wire has a pure copper wire inside and a layer of insulating paint wrapped around the outer shell. The coil frame is made of wear-resistant PBT material, and the iron core and the yoke are fixed together by riveting.

[0019] Furthermore, two yokes are provided.

[0020] Compared with the prior art, the present invention has the following technical advantages:

[0021] 1. Structural advantages: It adopts a unique shell design, and the inside of the shell is equipped with slots and cavities for positioning each component, providing accurate installation positions and stable support structures for each component, ensuring the precise relative positions between components, and effectively avoiding the impact of component displacement on relay performance during operation. Compared with existing technologies, it has higher stability.

[0022] 2. Dual-circuit control advantage: The control group circuit part is innovatively composed of the L1 control group circuit and the L2 control group circuit. The unique circuit connection method enables the relay to achieve dual-circuit control function and meet more complex circuit requirements, which is not available in the existing technology.

[0023] 3. Advantages of the dynamic reed design: The dynamic reed of each control group is carefully designed. Two pieces are made of copper sheets and the middle right part is U-shaped, which reduces working stress and prolongs service life and stability. There is also a beryllium copper dynamic reed with a bent design on the head, which acts as a buffer when the contacts are in contact. Combined with the double contact design, it greatly improves the reliability and stability of the circuit connection, which is better than the single dynamic reed design of the existing technology.

[0024] 4. Magnetic circuit system assembly and material advantages: The magnetic circuit system adopts riveting technology to rivet the yoke, core and coil frame together to ensure good magnetic conductivity; the magnetic steel component is made of DT4E material armature piece, NdFeB permanent magnet block and wear-resistant PBT material plastic body, and is formed through a specific injection molding process to ensure that the magnetic steel component has both good magnetic and mechanical properties, which is significantly improved in magnetic circuit performance and durability compared with existing technologies.

[0025] 5. Advantage in resisting short-circuit shock: The static spring seat of the L2 control group spans from below the moving contact and static contact of the L1 control group to the left side of the L1 control group. At this time, the static spring seat spanned by the L2 control group is perpendicular to the electromagnetic field of the magnetic circuit system, thereby reducing the interference of the magnetic field generated by the static spring seat of the L2 control group on the magnetic circuit system when the magnetic latching relay is subjected to a short-circuit shock, avoiding the failure of the short-circuit shock caused by the shaking of the moving contact due to the failure of the magnetic circuit system, and solving the problem of poor short-circuit shock resistance of the existing input and output symmetrical distributed magnetic latching relays, which greatly improves the ability to work stably in a complex circuit environment.

Brief Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the appearance of a dual-circuit magnetic latching relay with symmetrically distributed input and output for improving resistance to short-circuit impact of the present invention;

[0027] Figure 2 It is a main structural schematic diagram of a dual-circuit magnetic latching relay with symmetrically distributed input and output for improving resistance to short-circuit impact of the present invention;

[0028] Figure 3 is a front view of the magnetic steel assembly of the present invention;

[0029] Figure 4 is a cross-sectional view of the magnetic steel assembly of the present invention;

[0030] Figure 5 is a front view of the coil assembly of the present invention;

[0031] Figure 6 is a cross-sectional view of the coil assembly of the present invention;

[0032] Figure 7 It is a schematic diagram of the structure of the movable spring of each control group of the present invention;

[0033] Figure 8It is a schematic diagram of the contact design of the present invention. [Specific implementation method]

[0034] The present invention will be further described in detail below in conjunction with specific implementations and with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope of the present invention and its application.

[0035] like Figure 1 , 2 As shown, a dual-circuit magnetic latching relay with symmetrically distributed input and output for improving resistance to short-circuit impact comprises three parts, namely a housing part, a control group circuit part, and a magnetic circuit system part; the housing part comprises a shell 11, an upper cover 12, and a lower cover 13, wherein the shell 11 is arranged between the upper cover 12 and the lower cover 13, and slots and cavities for positioning various components are designed inside the shell; the control group circuit part comprises an L1 control group circuit and an L2 control group circuit, each of which comprises a moving contact, a moving spring seat, and a moving spring. The control unit 21 is composed of a static spring seat of the L1 control group, 22 is the static spring seat of the L2 control group, 23 is the static spring point and the moving contact of the two control groups, the left side is the static contact, and the right side is the moving contact, 24 is the moving spring seat of the L1 control group, 25 is the moving spring seat of the L2 control group, 26 is the moving spring sheet of each control group, the number of spring sheets is 3, the static contact is arranged on the static spring seat, the moving contact is arranged on the moving spring sheet, and the moving spring sheet assembly is arranged on the moving spring seat, and the three are fixed by riveting to form a combination.

[0036] The static spring seat 21 of the L1 control group and the dynamic spring seat 24 of the L1 control group constitute the L1 control group, and the static spring seat 22 of the L2 control group forms a control group loop from the right side of the magnetic circuit system; the static spring seat 22 of the L2 control group and the dynamic spring seat 25 of the L2 control group constitute the L2 control group, and the static spring seat 22 of the L2 control group crosses from below the static spring point and the dynamic contact point of the L1 control group to the left side of the dynamic spring seat 24 of the L1 control group to form a loop.

[0037] The magnetic circuit system includes a coil frame 30, a bracket 27, a pusher 32, a magnetic steel assembly 28, an enameled wire 33, an iron core 29, and a yoke 31. There are two yokes 31, which are respectively placed on both sides of the coil frame 30, one on each side, and the iron core 29 is inserted in the middle. The yoke 31, the iron core 29, and the coil frame 30 are riveted together by riveting. The magnetic steel assembly 28 is arranged between the two yokes 31. The bracket 27 is placed on the magnetic steel assembly 28 and is designed with convex nails and a shell to be fixed and matched with each other. The enameled wire 33 is wound on the coil frame 30. The pusher 32 is designed with a slot, which is respectively inserted into the lever of the magnetic steel assembly and the moving spring in each control group of the control group circuit to connect with each other, and then matched with the reasonable layout design of the shell and the slot limit to make it move synchronously. The open and closed states of the contacts are maintained by the magnetic force generated by the permanent magnet. Only the positive (negative) DC pulse voltage is needed to excite the coil, and the relay can complete the open and closed state conversion in an instant. Usually when the contacts are in the holding state, the coil does not need to continue to be energized, and the magnetic force of the permanent magnet alone can maintain the state of the relay.

[0038] like Figure 3 , 4 As shown, the magnetic steel assembly 28 includes two armature pieces 281, a permanent magnet block 282 and a plastic body 283, which are processed by a special process. The two armature pieces 281 and the permanent magnet block 282 are installed in the positioning fixture of the injection mold, and then the injection molding process is started. After the injection molding is full, the plastic body 283 wraps the two armature pieces 281 and the permanent magnet block 282 to form a whole, which is called a magnetic steel assembly. The two armature pieces 281 are made of DT4E material, the permanent magnet block 282 is made of neodymium iron boron material, and the plastic body 283 is made of relatively wear-resistant PBT material.

[0039] like Figure 5 , 6 As shown, the coil assembly consists of a coil frame 30, an enameled wire 33, an iron core 29, and a yoke 31. The iron core 29 and the yoke 31 are made of DT4E material. The enameled wire 33 has a pure copper wire inside and is wrapped with a layer of insulating paint on the outside. The coil frame 30 is made of relatively wear-resistant PBT material; the iron core 29 and the yoke 31 are fixed as a whole by riveting technology, and the riveting technology has a better magnetic conductivity effect.

[0040] like Figure 7 , 8 As shown, the movable spring 26 of each control group is composed of three overlapping pieces used simultaneously. The first movable spring 261 and the second movable spring 262 are made of copper sheets with good conductivity. The middle right part is designed in a U-shape. This design effectively reduces the stress of the movable spring. The third movable spring 263 is made of elastic beryllium copper material. The head has a bending design, which has a buffering effect when the contacts are in contact. This design can increase the life of the product. The contact 23 adopts a double contact design.

[0041] The technical principle of the dual-circuit magnetic latching relay with symmetrical input and output distribution to improve the resistance to short-circuit impact of the present invention is as follows:

[0042] 1. Overview of the overall structure

[0043] The dual-circuit magnetic latching relay of the present invention is mainly composed of a housing part, a control group circuit part and a magnetic circuit system part. This structural design not only realizes the symmetrical distribution of input and output, but also has a significant advantage in improving the ability to resist short-circuit impact.

[0044] 2. Structure and working principle of each part

[0045] (I) Shell part

[0046] The housing consists of an outer shell, an upper cover and a lower cover, with the outer shell located between the upper cover and the lower cover. The inner shell is designed with slots and cavities for positioning various components, which are used to provide accurate installation positions and stable support structures for various components of the relay, ensure the relative positions of the components are accurate, and avoid affecting the performance of the relay due to the displacement of components during operation.

[0047] (II) Control group circuit part

[0048] Basic composition and connection method The control group circuit part includes the L1 control group circuit and the L2 control group circuit. Each control group circuit consists of a moving contact, a moving spring seat, a moving spring, a static contact and a static spring seat. The static contact is placed on the static spring seat, the moving contact is placed on the moving spring, and the moving spring assembly is placed on the moving spring seat. The three are fixed by riveting to form a combination. Circuit formation principle The static spring seat of the L1 control group and the moving spring seat of the L1 control group form the L1 control group; the static spring seat of the L2 control group and the moving spring seat of the L2 control group form the L2 control group. The static spring seat of the L2 control group crosses from the front end below the static contact and the moving contact of the L1 control group to the left side of the moving spring seat of the L2 control group to form a complete circuit. This unique circuit design method enables the relay to realize the dual-circuit control function and lays the foundation for improving the ability to resist short-circuit impact. Design principle of moving spring The number of moving springs in each control group is 3. Two of them are made of copper sheets, and the middle right part is designed in a U-shape. This design can effectively reduce the stress generated by the dynamic reed during operation and improve the service life and stability of the dynamic reed. One of the dynamic reeds has a bent head design, and the remaining dynamic reed is made of beryllium copper. The dynamic reed with a bent head design can play a buffering role when the contacts are in contact, further increasing the life of the product. At the same time, the contacts adopt a double contact design to improve the reliability and stability of the circuit connection.

[0049] (III) Magnetic circuit system

[0050] 1. Basic composition and assembly structure

[0051] The magnetic circuit system includes a coil frame, a bracket, a pusher, a magnetic steel assembly, an enameled wire, an iron core and a yoke. There are two yokes, which are placed on both sides of the coil frame, and the iron core is inserted in the middle. The yoke, the iron core and the coil frame are riveted together by riveting. This riveting process can ensure a good magnetic conductivity. The magnetic steel assembly is set between the two yokes, and the bracket is placed on the magnetic steel assembly and the convex pins are designed to be fixed with the shell to ensure the stability of the position of the magnetic steel assembly. The coil frame is wrapped with enameled wire. The core of the enameled wire is pure copper wire, and the outside is wrapped with a layer of insulating paint, which can not only ensure good conductivity but also play an insulating role.

[0052] 2. Principle of manufacturing magnetic steel components

[0053] The magnetic steel assembly includes two armature pieces, a permanent magnet block and a plastic body. The two armature pieces and the permanent magnet block are installed in the injection mold fixture, and the injection molding process is performed. After the injection molding is full, the plastic body wraps the two armature pieces and the permanent magnet block to form a whole. The two armature pieces are made of DT4E material, the permanent magnet block is made of NdFeB material, and the plastic body is made of wear-resistant PBT material. This manufacturing process and material selection ensure that the magnetic steel assembly has good magnetic and mechanical properties.

[0054] 3. Partial working principle of magnetic circuit system

[0055] The magnetic circuit system is connected to an external power source through the enameled wire wound on the coil frame. When a positive (negative) DC pulse voltage is applied to excite the coil, the coil generates a magnetic field, which interacts with the magnetic field generated by the magnetic steel assembly to cause the magnetic steel assembly to move. The movement of the magnetic steel assembly is transmitted to the moving reed in the control group circuit through the pusher, and the moving reed drives the moving contact to move, thereby realizing the opening and closing state conversion of the relay contact. When the contact is in the holding state, due to the magnetic force generated by the permanent magnet, the state of the relay can remain unchanged even if the coil is no longer energized, realizing the magnetic holding function.

[0056] 3. Principle of anti-short circuit impact

[0057] In the case of a short-circuit impact, the static spring seat of the L2 control group will generate a magnetic field. Since the static spring seat of the L2 control group spans from below the moving contact and static contact of the L1 control group to the left side of the L1 control group, the section of the static spring seat spanned by the L2 control group is perpendicular to the electromagnetic field of the magnetic circuit system. According to the principles of electromagnetics, when two magnetic fields are perpendicular to each other, the mutual interference between them will be greatly reduced. Therefore, this structural design reduces the interference of the magnetic field generated by the static spring seat of the L2 control group on the magnetic circuit system when the magnetic latching relay is subjected to a short-circuit impact, avoids the shaking of the moving contact caused by the failure of the magnetic circuit system, thereby effectively preventing the failure of the short-circuit impact, and solves the problem of poor short-circuit impact resistance of the existing input and output symmetrically distributed magnetic latching relay. In summary, the dual-circuit magnetic latching relay with symmetrically distributed input and output to improve short-circuit impact resistance of the present invention realizes a stable and reliable dual-circuit control function and excellent short-circuit impact resistance through reasonable structural design and ingenious application of electromagnetic principles.

[0058] 4. Working principle:

[0059] When working, the relay can instantly complete the state transition between open and closed by simply exciting the coil with a positive (negative) DC pulse voltage. This is because when the pulse voltage is applied, the coil generates a magnetic field, which interacts with the magnetic field of the magnetic steel component, drives the pusher to move, and then drives the moving reed to move, realizing the opening and closing of the contacts. Usually, when the contacts are in the holding state, the coil does not need to continue to be energized, and the magnetic force of the permanent magnet alone can maintain the state of the relay unchanged.

[0060] What is particularly noteworthy is that when facing a short-circuit shock, since the static spring seat of the L2 control group spans from under the moving contact and static contact of the L1 control group to the left side of the L1 control group, and this spanning static spring seat is perpendicular to the electromagnetic field of the magnetic circuit system, the interference of the magnetic field generated by the static spring seat of the L2 control group on the magnetic circuit system when the magnetic latching relay is subjected to a short-circuit shock is reduced, avoiding the failure of the short-circuit shock caused by the shaking of the moving contact due to the failure of the magnetic circuit system, effectively solving the problem of poor short-circuit shock resistance of existing input and output symmetrical distributed magnetic latching relays, and greatly improving the ability of the relay to work stably in a complex circuit environment.

[0061] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A dual-circuit magnetic latching relay with symmetrical input and output distribution to improve short-circuit impact resistance, the structure of which includes three parts: a housing part, a control group circuit part, and a magnetic circuit system part, characterized in that: The shell part of the technique is composed of an outer shell, an upper cover and a lower cover, and the outer shell is arranged between the upper cover and the lower cover; The control group circuit part includes L1 control group circuit and L2 control group circuit. Each control group circuit consists of a moving contact, a moving spring, a moving spring seat, a static contact and a static spring seat. The static contact is placed on the static spring seat, the moving contact is placed on the moving spring, and the moving spring assembly is placed on the moving spring seat. The magnetic circuit system part includes a coil frame, enameled wire, iron core, yoke, bracket, push piece, and magnetic steel assembly. The yoke is arranged on both sides of the coil, and the iron core is inserted in the middle. The magnetic steel assembly is arranged between the two yokes, and the bracket is placed on the magnetic steel assembly. The enameled wire is wound on the coil frame. The push piece is designed with a slot, which is respectively inserted into the magnetic steel assembly and the control group circuit to connect the movable spring sheet in each control group to each other.

2. A dual-circuit magnetic latching relay with symmetrical input and output distribution for improving short-circuit impact resistance according to claim 1, characterized in that: The inside of the shell is designed with slots and cavities for positioning various components.

3. A dual-circuit magnetic latching relay with symmetrical input and output distribution for improving short-circuit impact resistance according to claim 1, characterized in that: The static spring seat of the L1 control group and the dynamic spring seat of the L1 control group constitute the L1 control group, and the L1 control group is arranged on the right side of the magnetic circuit part; the static spring seat of the L2 control group and the dynamic spring seat of the L2 control group constitute the L2 control group, and the static spring seat of the L2 control group spans from below the static contact and dynamic contact of the L1 control group to the left side of the dynamic spring seat of the L2 control group, forming a control group loop group.

4. A dual-circuit magnetic latching relay with symmetrical input and output distribution for improving short-circuit impact resistance according to claim 3, characterized in that: The number of reeds in each control group is 3.

5. A dual-circuit magnetic latching relay with symmetrical input and output distribution for improving short-circuit impact resistance according to claim 1, characterized in that: The coil frame of the magnetic circuit system is arranged vertically and in parallel with the movable spring seat.

6. A dual-circuit magnetic latching relay with symmetrical input and output distribution for improving short-circuit impact resistance according to claim 5, characterized in that: Two of the moving reeds are made of red copper sheets, with the middle right part designed in a U-shape; the remaining moving reed is made of beryllium copper with a bent design at the head.

7. A dual-circuit magnetic latching relay with symmetrical input and output distribution for improving short-circuit impact resistance according to claim 1, characterized in that: The magnetic steel assembly includes two armature pieces, a permanent magnet block and a plastic body. The processing technology is as follows: install the two armature pieces and the permanent magnet block in the positioning fixture of the injection mold, and then start the injection molding process. After the injection molding is full, the plastic body wraps the two armature pieces and the permanent magnet block to form a whole.

8. A dual-circuit magnetic latching relay with symmetrical input and output distribution for improving short-circuit impact resistance according to claim 8, characterized in that: The two armature pieces are made of DT4E material, the permanent magnet block is made of NdFeB material, and the plastic body is made of wear-resistant PBT material.

9. A dual-circuit magnetic latching relay with symmetrical input and output distribution for improving short-circuit impact resistance according to claim 1, characterized in that: The coil assembly consists of a coil frame, enameled wire, iron core, and yoke. The iron core and yoke are made of DT4E material. The enameled wire has a pure copper wire inside and is wrapped with a layer of insulating paint on the outside. The coil frame is made of wear-resistant PBT material. The iron core and yoke are fixed together by riveting.

10. A dual-circuit magnetic latching relay with symmetrical input and output distribution for improving short-circuit impact resistance according to claim 9, characterized in that: Two yokes are provided.

Images