Contact assembly and circuit breaker

Abstract

The utility model discloses a contact assembly and a circuit breaker, and relates to the technical field of low-voltage electrical appliances, the contact assembly comprises a moving contact and a static contact, and the moving contact can move relative to the static contact and abut against the static contact. One side of the moving contact, which is close to the static contact, is provided with a moving contact, one side of the static contact, which is close to the moving contact, is provided with a static contact, and the hardness of the moving contact is greater than that of the static contact. The abutting surface of the movable contact is a first arc-shaped surface, the abutting surface of the static contact is a second arc-shaped surface, and the bending degree of the first arc-shaped surface is larger than that of the second arc-shaped surface. According to the invention, after the moving contact is in contact with the static contact, the moving contact can obtain a larger contact area along with the deformation of the static contact, thereby reducing the damage of the moving contact and the static contact, reducing the contact resistance, reducing the electric erosion, reducing the temperature rise caused by contact disguise, and prolonging the service life of the moving contact and the static contact.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to a contact assembly and a circuit breaker. Background Art

[0002] Switching devices, such as circuit breakers, are widely used in power systems. The performance of the moving and static contacts in these devices directly determines the operating efficiency and reliability of the entire power system. Traditional line contact methods for moving and static contacts can meet basic requirements.

[0003] However, line contact has some significant drawbacks. The relatively small contact area leads to increased contact resistance. This increased contact resistance not only causes temperature rise at the contact point but also increases energy loss. Utility Model Content

[0004] The present application provides a contact assembly and a circuit breaker, which can enable the movable contact to obtain a larger contact area as the static contact deforms after the movable contact contacts the static contact, thereby reducing damage to both parties, lowering contact resistance, reducing electrical erosion, and reducing the temperature rise of the contact camouflage, thereby increasing the service life of the movable contact and the static contact.

[0005] In a first aspect, the present application provides a contact assembly, which includes a movable contact and a stationary contact. The movable contact is movable relative to the stationary contact and abuts against the stationary contact.

[0006] A moving contact point is provided on one side of the moving contact close to the static contact, and a static contact point is provided on one side of the static contact close to the moving contact. The hardness of the moving contact point is greater than that of the static contact point.

[0007] The abutting surface of the movable contact is a first arcuate surface, and the abutting surface of the static contact is a second arcuate surface. The curvature of the first arcuate surface is greater than that of the second arcuate surface.

[0008] Based on the above example, the contact has the ability to move relative to the static contact and can move to a position of contact with the static contact. A moving contact point is set on the side of the moving contact close to the static contact, and a static contact point is set on the side of the static contact close to the moving contact.

[0009] The hardness of the moving contact is designed to be higher than that of the static contact. This design allows the static contact to cushion the moving contact during contact, thereby reducing the risk of damage to the moving contact due to excessive impact force. Furthermore, this design allows the moving contact to gain a larger contact area as the static contact deforms after contact, thereby reducing damage to both contacts, lowering contact resistance, minimizing electrical erosion, and lowering the temperature rise of the contact patch, thereby increasing the service life of both the moving and static contacts.

[0010] The contact surface between the moving contact and the static contact is a first curved surface, while the contact surface between the static contact and the moving contact is a second curved surface. The curvature of the first curved surface is designed to be greater than that of the second curved surface. This structural design, coupled with the lower hardness of the static contact than the moving contact, allows the second curved surface to gradually deform when the moving contact applies pressure to the static contact, and the contact area with the first curved surface gradually increases. This process provides a certain buffering effect on the moving contact, thereby reducing damage to the static contact caused by the moving contact.

[0011] In some examples, a buffer plane is provided in the middle of the first arcuate surface.

[0012] Based on the above example, a buffer plane can be specially designed at the center of the first curved surface. The buffer plane is a small plane smaller than the first curved surface. When the moving contact and the static contact come into contact, the buffer plane will first come into contact with the second curved surface. As the second curved surface gradually deforms, other areas of the first curved surface will gradually come into contact with the second curved surface. Through this design, the buffer plane can effectively increase the single-point pressure between the moving contact and the static contact, thereby improving the contact effect. At the same time, this design also helps to reduce the contact resistance of the product, thereby reducing the temperature rise of the product and improving the overall performance and reliability.

[0013] In some examples, a middle portion of the first arcuate surface is cut away to form a buffer plane.

[0014] Based on the above example, the middle part of the first curved surface is cut off to form a buffer plane. This structural design has significant advantages. The cutting processing method can significantly improve the forming efficiency of the buffer plane. And in this way, the process difficulty can be effectively reduced, thereby reducing the processing cost. Specifically, the processing of the buffer plane can be carried out directly during the integral molding process of the moving contact, or another method can be used, that is, first processing the moving contact with the first curved surface, and then processing the corresponding buffer plane through different processing methods such as turning, milling, planing and grinding.

[0015] In some examples, the intersection between the second curved surface and the two side planes is an arc-shaped transition and forms a transition curved surface.

[0016] Based on the above example, the intersection between the second curved surface and the two side planes adopts a curved transition design, which makes the intersection between the second curved surface and the two side planes present a smooth transition effect to form a transition curved surface.

[0017] In practical applications, when the moving contact impacts the stationary contact, stress concentration often causes problems at the intersection. These problems primarily include defects such as dents and fractures in the stationary contact. To address these issues, the introduction of an arc-shaped transition effectively reduces stress concentration. This significantly increases the service life of the stationary contact, thereby enhancing the stability and reliability of the entire device.

[0018] In some examples, the first arcuate surface and the second arcuate surface are both circular arc surfaces, and the radius of the first arcuate surface is smaller than the radius of the second arcuate surface.

[0019] Based on the above example, the first curved surface and the second curved surface are both designed to be circular arc-shaped surfaces. Specifically, the radius of curvature of the first curved surface is set to be smaller than the radius of curvature of the second curved surface. This design choice is mainly based on the consideration of reducing the processing difficulty in the manufacturing process and significantly improving production efficiency. By designing the radius of the first curved surface to be smaller than the radius of the second curved surface, the contact area between the moving contact and the static contact (the contact area after the static contact is partially deformed) can be effectively increased. Such an improvement helps to improve the problem of the moving contact and the static contact being thinned when pressure is applied. By increasing the contact area, the static contact can be effectively slowed down or even prevented from being dented and broken in local areas, thereby significantly improving the service life of the moving contact and the static contact. The above design not only optimizes the contact performance of the contact, but also ensures the stable operation and reliability of the overall equipment.

[0020] In some examples, the arc radius corresponding to the first arc surface is 20 mm, and the arc radius corresponding to the second arc surface is 22 mm.

[0021] Based on the above example, the arc radius corresponding to the first curved surface is set to 20 mm, and the arc radius corresponding to the second curved surface is set to 22 mm. It should be noted that these values are provided only as examples, and their main purpose is to illustrate that in actual applications, the arc radius corresponding to the first curved surface should be smaller than the arc radius corresponding to the second curved surface. For example, the arc radius of the first curved surface can be set to 18 mm, and the arc radius of the second curved surface can be set to 20 mm; or the arc radius of the first curved surface can be set to 22 mm, and the arc radius of the second curved surface can be set to 24 mm. Of course, these values can also be any other dimensions, as long as the basic condition that the arc radius of the first curved surface is smaller than the arc radius of the second curved surface is met.

[0022] In some examples, the second arc-shaped surface can completely cover the first arc-shaped surface, and the static contact can abut against at least one moving contact.

[0023] Based on the above example, the second curved surface is of sufficient size and shape to completely cover the first curved surface. In this case, the static contact has sufficient contact area to abut and contact at least one moving contact. This structural design allows multiple first curved surfaces to simultaneously adapt to and cover a single second curved surface, allowing a corresponding static contact to simultaneously contact and contact multiple moving contacts. The advantage of this design is that it provides a larger contact area and higher contact stability, thereby improving overall electrical performance and reliability.

[0024] The drawings in this application illustrate a one-to-one correspondence, with one first curved surface corresponding to one second curved surface, and one static contact corresponding to one moving contact. However, this design is not exclusive and can also be reversed. In other words, multiple second curved surfaces can simultaneously fit onto and overlie a single first curved surface, allowing multiple corresponding static contacts to simultaneously contact and engage a single moving contact. This design also has its unique advantages, such as providing more contact points, further improving contact stability and reliability.

[0025] In some examples, the static contact is disposed on the busbar structure, and the static contact point is disposed at an end of the busbar structure located within the housing.

[0026] Based on the above example, the stationary contact is designed to be installed at a specific location on the busbar structure. Specifically, the stationary contact is located at the inner end of the busbar structure, within the housing. This structural design demonstrates the specific installation location of the stationary contact, where it closely cooperates with the busbar structure and works in tandem. Simultaneously, a moving contact, compatible with the stationary contact, is located at a corresponding position within the housing. This design ensures good contact and electrical connection between the stationary and moving contacts, thereby achieving a stable and reliable electrical circuit.

[0027] In some examples, a first bracket and a second bracket are respectively provided on both sides of the busbar structure, the first bracket is a fixed bracket, and the second bracket is an elastic bracket.

[0028] Based on the above example, the busbar structure described is equipped with a first bracket and a second bracket on each side. The first bracket is designed as a fixed bracket, while the second bracket is designed as an elastic bracket. The first bracket can be securely connected to the corresponding bracket using bolts, screws, or other types of fasteners. This design significantly improves the connection stability of the busbar structure. Furthermore, the second bracket, as an elastic bracket, can impart a certain cushioning effect to the busbar structure, thereby providing the necessary buffering during the connection between the moving and stationary contacts.

[0029] In a second aspect, the present application provides a circuit breaker, comprising the contact assembly and a housing as described above, wherein the housing has an accommodating cavity, and the contact assembly is disposed in the accommodating cavity.

[0030] The circuit breaker having the above-mentioned contact assembly of the present application can enable the moving contact to obtain a larger contact area as the static contact deforms after the moving contact contacts the static contact, thereby reducing damage to both parties, reducing contact resistance, reducing electrical corrosion, and reducing the temperature rise of the contact camouflage, thereby increasing the service life of the moving contact and the static contact.

[0031] The contact has the ability to move relative to the static contact and can move to a position where it contacts the static contact. A moving contact point is set on the side of the moving contact close to the static contact, and a static contact point is set on the side of the static contact close to the moving contact.

[0032] The hardness of the moving contact is designed to be higher than that of the static contact. This design allows the static contact to cushion the moving contact during contact, thereby reducing the risk of damage to the moving contact due to excessive impact force. Furthermore, this design allows the moving contact to gain a larger contact area as the static contact deforms after contact, thereby reducing damage to both contacts, lowering contact resistance, minimizing electrical erosion, and lowering the temperature rise of the contact patch, thereby increasing the service life of both the moving and static contacts. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in this application or the prior art, the following briefly introduces the drawings required for use in the examples or descriptions of the prior art. Obviously, the drawings described below are only some examples of this application. For those skilled in the art, other drawings can be obtained based on these drawings without any creative work.

[0034] Figure 1 This is a schematic diagram of the structure after the moving contact and the static contact in the contact assembly in an example of the present application are connected.

[0035] Figure 2 for Figure 1 An enlarged schematic diagram of the structure of the connection position between the moving contact and the static contact at point A in the middle.

[0036] Figure 3 This is a schematic diagram of the structural explosion of the moving contact and the static contact in the contact assembly in an example of the present application.

[0037] Figure 4 This is a schematic structural diagram of a moving contact in a contact assembly in an example of the present application.

[0038] Figure 5 for Figure 4 An enlarged schematic diagram of the structure of the moving contact on the moving contact at position B in the middle.

[0039] Figure 6 This is a schematic structural diagram of a static contact in a contact assembly in an example of the present application.

[0040] Reference numerals:

[0041] 100, moving contact; 110, moving contact point; 111, first arcuate surface; 112, buffer plane; 120, raised structure; 200, static contact; 210, static contact point; 211, second arcuate surface; 212, transition arc surface; 220, busbar structure; 221, first bracket; 222, second bracket. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain this application and are not intended to limit this application.

[0043] To solve the above technical problems, please refer to Figures 1-6As shown, the first aspect of the present application proposes a contact assembly, which can enable the moving contact 100 to obtain a larger contact area as the static contact 210 deforms after the moving contact 100 contacts the static contact 210, thereby reducing damage to both parties, reducing contact resistance, reducing electrical corrosion, and reducing the temperature rise of the contact camouflage, thereby improving the service life of the moving contact 100 and the static contact 200.

[0044] Reference Figure 1 and Figure 3 As shown, in some examples, the contact assembly includes a movable contact 100 and a stationary contact 200 . The movable contact 100 is movable relative to the stationary contact 200 and abuts against the stationary contact 200 .

[0045] A movable contact 110 is provided on the side of the movable contact 100 close to the stationary contact 200, and a stationary contact 210 is provided on the side of the stationary contact 200 close to the movable contact 100. The hardness of the movable contact 110 is greater than that of the stationary contact 210. This allows the stationary contact 210 to provide a certain buffer for the movable contact 110 during contact with the movable contact 110, reducing damage to the movable contact 110 caused by impact. In addition, after the movable contact 100 contacts the stationary contact 210, as the stationary contact 210 deforms, a larger contact area is provided, reducing damage to both parties and increasing the service life of the movable contact 100 and the stationary contact 200.

[0046] The abutting surface of the movable contact 110 is a first curved surface 111, and the abutting surface of the stationary contact 210 is a second curved surface 211. The curvature of the first curved surface 111 is greater than that of the second curved surface 211. This structure can accommodate the fact that the hardness of the stationary contact 210 is lower than that of the movable contact 110. As the movable contact 110 presses against the stationary contact 210, the second curved surface 211 gradually deforms, and the contact area with the first curved surface 111 gradually increases. During this process, the stationary contact 210 can provide a certain degree of cushioning for the movable contact 110, thereby reducing damage to the stationary contact 210 caused by the movable contact 110.

[0047] The arc surface of the static contact 210 can be set to be larger than the arc surface of the movable contact 110. This setting is to increase the contact area between the movable contact 100 and the static contact 200, thereby improving the phenomenon that the movable contact 100 and the static contact 200 are compressed under pressure.

[0048] Based on the above example, the contact has the ability to move relative to the static contact 200 and can move to a position of contact with the static contact 200. A moving contact 110 is provided on the side of the moving contact 100 close to the static contact 200, and a static contact 210 is provided on the side of the static contact 200 close to the moving contact 100.

[0049] It is worth noting that the hardness of the movable contact 110 is designed to be higher than that of the static contact 210. This design is intended to provide a buffering effect to the movable contact 110 during the contact between the static contact 210 and the movable contact 110, thereby reducing the risk of damage to the movable contact 110 due to excessive impact force. In addition, this design also allows the movable contact 110 to obtain a larger contact area as the static contact 210 deforms after the movable contact 100 contacts the static contact 210, thereby reducing damage to both parties, lowering contact resistance, reducing electrical erosion, and lowering the temperature rise of the contact camouflage, thereby increasing the service life of the movable contact 100 and the static contact 200.

[0050] Furthermore, the contact surface between the moving contact 110 and the static contact 210 is configured as a first curved surface 111, and the contact surface between the static contact 210 and the moving contact 110 is configured as a second curved surface 211. The curvature of the first curved surface 111 is designed to be greater than that of the second curved surface 211. This structural design is consistent with the characteristic that the hardness of the static contact 210 is lower than that of the moving contact 110. When the moving contact 110 applies pressure to the static contact 210, the second curved surface 211 gradually deforms, and the contact area with the first curved surface 111 gradually increases. During this process, the static contact 210 can provide a certain buffering effect on the moving contact 110, thereby reducing damage to the static contact 210 caused by the moving contact 110.

[0051] To further increase the contact area between the movable contact 100 and the stationary contact 200, the curved surface of the stationary contact 210 is designed to be larger than that of the movable contact 110. This design aims to alleviate the problem of the movable contact 100 and the stationary contact 200 being easily compressed under pressure, thereby increasing their service life and reliability. This contact assembly design ensures excellent contact performance and stability during long-term use.

[0052] In the present application, a protruding structure 120 is provided on a side of the movable contact 100 close to the stationary contact 200 , and the movable contact point 110 can be provided on the protruding structure 120 .

[0053] Reference Figure 4 As shown, in some examples, a buffer plane 112 is provided in the middle of the first curved surface 111. During the contact process between the movable contact 100 and the stationary contact 200, the buffer plane 112 on the first curved surface 111 will first contact the second curved surface 211. As the second curved surface 211 deforms, a larger area of the first curved surface 111 contacts the second curved surface 211.

[0054] Based on the above example, a buffer plane 112 can be specially designed at the center position of the first curved surface 111. The buffer plane 112 is a small plane smaller than the first curved surface 111. When the moving contact 100 and the static contact 200 come into contact, the buffer plane 112 will first come into contact with the second curved surface 211. As the second curved surface 211 gradually deforms, other areas of the first curved surface 111 will gradually come into contact with the second curved surface 211. Through this design, the buffer plane 112 can effectively increase the single-point pressure between the moving contact 110 and the static contact 210, thereby improving the contact effect. At the same time, this design also helps to reduce the contact resistance of the product, thereby reducing the temperature rise of the product and improving the overall performance and reliability.

[0055] In some examples, the middle portion of the first curved surface 111 is partially removed to form a buffer plane 112. The width of the buffer plane 112 can be set to approximately 2 mm to 3 mm, but is not limited to this range. It is adaptively adjusted based on the size of the moving contact on the moving contact. The width of the buffer plane 112 corresponds to the arc length of the arc cross-section of the first curved surface 111. The length of the buffer plane 112 corresponds to the size of the moving contact and adapts to the size of the moving contact.

[0056] Based on the above example, the middle portion of the first curved surface 111 is cut off to form a buffer plane 112. This structural design has significant advantages. The cutting processing method can significantly improve the forming efficiency of the buffer plane 112. In this way, the process difficulty can be effectively reduced, thereby reducing the processing cost. Specifically, the processing of the buffer plane 112 can be carried out directly during the integral molding process of the moving contact 110, or another method can be used, that is, first processing the moving contact 110 with the first curved surface 111, and then processing the corresponding buffer plane 112 through different processing methods such as turning, milling, planing and grinding.

[0057] The provision of the buffer plane 112 has multiple advantages. First, it can significantly increase the single-point pressure between the moving contact 110 and the static contact 210. This increased pressure helps ensure more stable and reliable contact. Secondly, the provision of the buffer plane 112 can also effectively reduce the contact resistance of the product. Lower contact resistance means that current can flow more smoothly through the contact points, thereby reducing energy loss. Finally, by reducing the contact resistance, the temperature rise generated by the product during operation will also be reduced accordingly. This not only improves the overall performance of the product, but also extends its service life, ensuring that the equipment remains stable and reliable during long-term operation.

[0058] Reference Figure 5 and Figure 6 In some examples, the second arc-shaped surface 211 and the two side planes (based on Figure 4 and Figure 6 The intersection between the upper and lower side planes (in the figure) is an arc-shaped transition, forming a transition arc surface 212. The intersection between the second arc surface 211 and the two side planes often causes stress concentration after the movable contact 110 impacts the static contact 210, and is prone to defects such as dents and fractures in the static contact 210. The arc-shaped transition can reduce stress concentration and increase the service life of the static contact 210.

[0059] Based on the above example, the intersection between the second curved surface 211 and the two side planes adopts a curved transition design, which makes the intersection between the second curved surface 211 and the two side planes present a smooth transition effect to form a transition curved surface 212 .

[0060] In actual applications, when the moving contact 110 impacts the static contact 210, stress concentration often causes problems at the intersection. These problems primarily include defects such as dents and fractures in the static contact 210. To address these issues, the introduction of an arc-shaped transition effectively reduces stress concentration. This significantly increases the service life of the static contact 210, thereby enhancing the stability and reliability of the overall device.

[0061] Reference Figure 5 and Figure 6 In some examples, the first curved surface 111 and the second curved surface 211 are both circular arc surfaces, and the radius of the first curved surface 111 is smaller than the radius of the second curved surface 211. This setting can reduce processing difficulty and improve production efficiency. The setting of the radius of the first curved surface 111 being smaller than the radius of the second curved surface 211 is to increase the contact area between the moving contact 100 and the static contact 200, thereby improving the phenomenon of the moving contact 100 and the static contact 200 being compressed under pressure. It can slow down or even prevent the static contact 200 from being locally sunken and broken, thereby improving the service life of the moving contact 100 and the static contact 200.

[0062] Based on the above example, both the first curved surface 111 and the second curved surface 211 are designed as circular arc-shaped surfaces. Specifically, the radius of curvature of the first curved surface 111 is set to be smaller than that of the second curved surface 211. This design choice is primarily intended to reduce processing difficulty during the manufacturing process and significantly improve production efficiency. By designing the radius of the first curved surface 111 to be smaller than that of the second curved surface 211, the contact area between the moving contact 100 and the stationary contact 200 (the contact area after the partial deformation of the stationary contact 210) can be effectively increased. This improvement helps to alleviate the problem of the moving contact 100 and the stationary contact 200 being compressed when pressure is applied. By increasing the contact area, it can effectively reduce or even prevent localized dents and fractures in the stationary contact 200, thereby significantly improving the service life of the moving contact 100 and the stationary contact 200. This design not only optimizes the contact performance of the contacts but also ensures the stable operation and reliability of the entire device.

[0063] In some examples, the arc radius corresponding to the first arc surface 111 is 20 mm, and the arc radius corresponding to the second arc surface 211 is 22 mm.

[0064] Based on the above example, the arc radius corresponding to the first curved surface 111 is set to 20 mm, while the arc radius corresponding to the second curved surface 211 is set to 22 mm. It should be noted that these values are provided only as examples, and their main purpose is to illustrate that in actual applications, the arc radius corresponding to the first curved surface 111 should be smaller than the arc radius corresponding to the second curved surface 211. For example, the arc radius of the first curved surface 111 can be set to 18 mm, while the arc radius of the second curved surface 211 can be set to 20 mm; or the arc radius of the first curved surface 111 can be set to 22 mm, while the arc radius of the second curved surface 211 can be set to 24 mm. Of course, these values can also be any other dimensions, as long as the basic condition that the arc radius of the first curved surface 111 is smaller than the arc radius of the second curved surface 211 is met.

[0065] In some examples, the second curved surface 211 can completely cover the first curved surface 111, and the static contact 200 can abut at least one movable contact 100. This structure allows multiple first curved surfaces 111 to simultaneously fit within one second curved surface 211, and a corresponding static contact 200 can simultaneously contact multiple movable contacts 100. The drawings in this application are provided for illustrative purposes using a one-to-one configuration.

[0066] Based on the above example, the second curved surface 211 has sufficient size and shape to completely cover the first curved surface 111. In this case, the static contact 200 has sufficient contact area to abut and contact at least one moving contact 100. This structural design allows multiple first curved surfaces 111 to simultaneously adapt to and cover a single second curved surface 211, allowing a corresponding static contact 200 to simultaneously contact and contact multiple moving contacts 100. The advantage of this design is that it provides a larger contact area and higher contact stability, thereby improving overall electrical performance and reliability.

[0067] The drawings in this application illustrate a one-to-one correspondence, i.e., one first curved surface 111 corresponds to one second curved surface 211, and one static contact 200 corresponds to one moving contact 100. However, this design is not exclusive and can also be reversed. In other words, multiple second curved surfaces 211 can simultaneously fit onto and cover a single first curved surface 111, allowing multiple corresponding static contacts 200 to simultaneously contact and engage a single moving contact 100. This design also has its unique advantages, such as providing more contact points, further improving contact stability and reliability.

[0068] In general, whether a one-to-one design or a many-to-one design is adopted, the structure in this application can effectively achieve good contact between the static contact 200 and the moving contact 100, thereby ensuring the normal operation and high reliability of the electrical equipment.

[0069] In some examples, the static contact 200 is disposed on the busbar structure 220, and the static contact point 210 is disposed at the end of the busbar structure 220 located within the housing. The above structure illustrates the placement of the static contact 200, where the static contact 200 is disposed in conjunction with the busbar structure 220, and a corresponding movable contact 100 is disposed within the corresponding housing.

[0070] Based on the above example, the static contact 200 is designed to be installed at a specific position on the busbar structure 220. Specifically, the static contact 210 is located at the inner end of the busbar structure 220, i.e., within the housing. This structural design demonstrates the specific installation position of the static contact 200, wherein the static contact 200 and the busbar structure 220 work closely together. Simultaneously, a movable contact 100, compatible with the static contact 200, is located at a corresponding position within the housing. This design ensures good contact and electrical connection between the static contact 200 and the movable contact 100, thereby achieving a stable and reliable electrical circuit.

[0071] In some examples, a first bracket 221 and a second bracket 222 are respectively provided on both sides of the busbar structure 220 . The first bracket 221 is a fixed bracket, and the second bracket 222 is an elastic bracket.

[0072] Based on the above example, the busbar structure 220 is described as being equipped with a first bracket 221 and a second bracket 222 on either side. The first bracket 221 is designed as a fixed bracket, while the second bracket 222 is designed as an elastic bracket. The first bracket 221 can be securely connected to the corresponding bracket using bolts, screws, or other types of fasteners. This design significantly improves the connection stability of the busbar structure 220. Furthermore, the second bracket 222, acting as an elastic bracket, can impart a certain degree of cushioning performance to the busbar structure 220, thereby providing the necessary cushioning during the connection between the moving contact 100 and the static contact 200.

[0073] When the moving contact 100 and the stationary contact 200 come into contact, they experience a relative sliding process. The specific direction of this sliding process can be from the first bracket 221 toward the second bracket 222. For example, if the second bracket 222 is positioned above the busbar structure 220 and the first bracket 221 is positioned below the busbar structure 220, the sliding direction will correspond to a bottom-up direction. This design not only ensures the stability of the connection, but also improves the reliability and durability of the entire busbar structure 220 during dynamic contact through the cushioning effect of the elastic bracket.

[0074] In this application, the contact method between the static contact 210 and the movable contact 110 has been improved, transforming the traditional linear contact method into an arc surface contact method. The main purpose of this improvement is to significantly increase the contact area, thereby effectively destroying the oxide film on the contact surface when the product contacts. In this way, the contact resistance of the product can be significantly reduced, improving the overall electrical performance and reliability.

[0075] In a second aspect, the present application provides a circuit breaker, comprising the contact assembly and a housing as described above, wherein the housing has an accommodating cavity, and the contact assembly is disposed in the accommodating cavity.

[0076] The circuit breaker having the above-mentioned contact assembly of the present application can enable the movable contact 100 to obtain a larger contact area as the static contact 210 deforms after the movable contact 100 contacts the static contact 210, thereby reducing damage to both parties, reducing contact resistance, reducing electrical corrosion, and reducing the temperature rise of the contact camouflage, thereby improving the service life of the movable contact 100 and the static contact 200.

[0077] Specifically, the contact has the ability to move relative to the static contact 200 and can move to a position in contact with the static contact 200. A moving contact 110 is provided on the side of the moving contact 100 close to the static contact 200, and a static contact 210 is provided on the side of the static contact 200 close to the moving contact 100.

[0078] It is worth noting that the hardness of the movable contact 110 is designed to be higher than that of the static contact 210. This design is intended to provide a buffering effect to the movable contact 110 during the contact between the static contact 210 and the movable contact 110, thereby reducing the risk of damage to the movable contact 110 due to excessive impact force. In addition, this design also allows the movable contact 110 to obtain a larger contact area as the static contact 210 deforms after the movable contact 100 contacts the static contact 210, thereby reducing damage to both parties, lowering contact resistance, reducing electrical erosion, and lowering the temperature rise of the contact camouflage, thereby increasing the service life of the movable contact 100 and the static contact 200.

[0079] Furthermore, the contact surface between the moving contact 110 and the static contact 210 is configured as a first curved surface 111, and the contact surface between the static contact 210 and the moving contact 110 is configured as a second curved surface 211. The curvature of the first curved surface 111 is designed to be greater than that of the second curved surface 211. This structural design is consistent with the characteristic that the hardness of the static contact 210 is lower than that of the moving contact 110. When the moving contact 110 applies pressure to the static contact 210, the second curved surface 211 gradually deforms, and the contact area with the first curved surface 111 gradually increases. During this process, the static contact 210 can provide a certain buffering effect on the moving contact 110, thereby reducing damage to the static contact 210 caused by the moving contact 110.

[0080] To further increase the contact area between the movable contact 100 and the stationary contact 200, the curved surface of the stationary contact 210 is designed to be larger than that of the movable contact 110. This design aims to alleviate the problem of the movable contact 100 and the stationary contact 200 being easily compressed under pressure, thereby increasing their service life and reliability. This contact assembly design ensures excellent contact performance and stability during long-term use.

[0081] The contact assembly of the present application is not limited to switching devices such as circuit breakers, and the contact assembly can also be applied to switching devices such as fuses, contactors, and relays.

[0082] The same or similar numbers in the drawings of this application correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0083] The above are only preferred examples of this application and are not intended to limit this application. Any modifications, equivalent replacements and improvements made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A contact assembly, characterized in that: The contact assembly includes a movable contact and a stationary contact, wherein the movable contact is movable relative to the stationary contact and abuts against the stationary contact; A moving contact is provided on a side of the moving contact close to the static contact, and a static contact is provided on a side of the static contact close to the moving contact, wherein the hardness of the moving contact is greater than that of the static contact; The abutting surface of the movable contact is a first arcuate surface, and the abutting surface of the static contact is a second arcuate surface. The curvature of the first arcuate surface is greater than that of the second arcuate surface.

2. The contact assembly according to claim 1, wherein: A buffer plane is provided in the middle of the first arc-shaped surface.

3. The contact assembly according to claim 2, wherein: A middle portion of the first arc-shaped surface is cut away to form the buffer plane.

4. The contact assembly according to claim 1, wherein: The intersection between the second arc-shaped surface and the two side planes is an arc-shaped transition and forms a transition arc surface.

5. The contact assembly according to any one of claims 1 to 4, characterized in that: The first arc-shaped surface and the second arc-shaped surface are both circular arc surfaces, and the radius of the first arc-shaped surface is smaller than the radius of the second arc-shaped surface.

6. The contact assembly according to claim 5, wherein: The arc radius corresponding to the first arc surface is 20 mm, and the arc radius corresponding to the second arc surface is 22 mm.

7. The contact assembly according to claim 1, wherein: The second arc-shaped surface can completely cover the first arc-shaped surface, and the static contact can abut against at least one of the moving contacts.

8. The contact assembly according to claim 1, wherein: The static contact is arranged on the busbar structure, and the static contact point is arranged at the end of the busbar structure located inside the housing.

9. The contact assembly according to claim 8, wherein: A first bracket and a second bracket are respectively provided on both sides of the busbar structure, wherein the first bracket is a fixed bracket and the second bracket is an elastic bracket.

10. A circuit breaker, characterized in that: include: The contact assembly according to any one of claims 1 to 9; and, The housing has a receiving cavity, and the contact assembly is arranged in the receiving cavity.

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