A contact structure for improving the electrical life of a circuit breaker

Abstract

The utility model discloses a kind of contact structure for improving circuit breaker electrical life, including moving contact assembly and static contact assembly, moving contact assembly is contacted with static contact assembly by operating mechanism;The moving contact assembly includes multiple short moving contact, multiple long moving contact and the shaft connected by it;By main arc contact, riveting process can be completely avoided, and the electrical life is greatly reduced due to arc contact drop-off even short-circuit breaking failure problem, and arc surface and main contact surface form "L" type arc erosion surface, in addition to main contact surface arc erosion resistance when breaking, arc erosion resistance on contact upper side can also be, service life is longer, simultaneously, using double arc contact design, main arc contact uses arc erosion resistance alloy material, after main arc contact ablation failure, secondary arc contact is first combined and then separated effect, which can reliably improve circuit breaker electrical life.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a contact structure for improving the electrical life of a circuit breaker. Background Technology

[0002] Intelligent universal circuit breakers are commonly used electrical devices in power systems. Their main functions are to distribute electrical energy and protect lines and power equipment from faults such as overload, undervoltage, and short circuit. They can also be used as disconnecting switches to break circuits, thereby protecting electrical equipment and ensuring personal safety.

[0003] The contact system is the core component of a circuit breaker. The circuit breaker connects and disconnects the circuit through the action of the contact system. Specifically, the contact system includes moving contacts and stationary contacts, which are arranged opposite each other inside the circuit breaker. In the fields of new energy such as photovoltaic and wind power or special power distribution sites, the requirements for the electrical life of the frame circuit breaker are becoming increasingly higher.

[0004] In existing technical solutions, the moving and stationary contacts generally include a set of main contacts and a set of arc contacts. When the circuit breaker disconnects, the arc contacts of the moving and stationary contacts separate after the main contacts, generating an electric arc at the arc contacts. This arc causes ablation and wear of the arc contacts. When the arc contacts wear to a certain extent, the effect of the arc contacts closing before opening fails, leading to the ablation of the main contacts. The arc contacts generally adopt a small contact structure and are welded to the moving and stationary contacts respectively. Their electrical life reliability depends entirely on the welding quality. If the welding is poor, there is a risk of the arc contacts falling off during use, causing the effect of the arc contacts closing before opening to fail, leading to the ablation of the main contacts, resulting in a significant reduction in electrical life or even short-circuit breaking failure. Therefore, we need to propose a contact structure to improve the electrical life of circuit breakers. Utility Model Content

[0005] The purpose of this utility model is to provide a contact structure that improves the electrical life of circuit breakers, thereby solving the problem mentioned in the background art where poor welding of arc contacts leads to detachment, resulting in a significant reduction in the electrical life of circuit breakers or even short-circuit breaking failure.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A contact structure for improving the electrical life of a circuit breaker includes a moving contact assembly and a stationary contact assembly, wherein the moving contact assembly contacts the stationary contact assembly via an operating mechanism.

[0008] The moving contact assembly includes multiple short moving contacts, multiple long moving contacts, and a shaft connecting them;

[0009] The short moving contact consists of a moving main contact and a short conductive sheet, and the long moving contact consists of a long conductive sheet, a moving main arc contact, and a rivet. The moving main arc contact is riveted and fixed to the long conductive sheet. Both the short and long conductive sheets are provided with moving secondary arc contacts. The moving secondary arc contacts and the conductive sheets are an integral structure. The moving main arc contact is positioned higher than the moving secondary arc contact.

[0010] Preferably, the moving main arc contact has two second fixing holes corresponding to the rivets, and the rivets pass through the second fixing holes to be fixed to the long conductive sheet.

[0011] Preferably, the moving main arc contact is provided with an arc-initiating surface and a main contact surface, and the arc-initiating surface and the main contact surface form an "L"-shaped arc-resistant surface.

[0012] Preferably, the long conductive sheet has a pressure-bearing surface, and two first fixing holes are opened on the pressure-bearing surface. The rivet passes through the second fixing hole on the moving main arc contact and is fixed to the first fixing hole.

[0013] Preferably, the stationary contact assembly includes an arc-starting plate, a stationary main arc contact, an equipotential block, a stationary contact, a corner plate, an internal hexagonal head screw, an external hexagonal head screw, and a nut;

[0014] The arc-starting plate, equipotential block, stationary contact, and angle plate are assembled sequentially from bottom to top and fixed by nuts and external hexagonal three-way screws. The stationary main arc contact is fixed to the equipotential block by internal hexagonal three-way screws.

[0015] Preferably, the stationary contact includes a stationary busbar and a stationary main contact located at its end. The equipotential block is mounted on the stationary contact and has a stationary secondary arc contact, two threaded through holes, and a concave mounting surface.

[0016] The stationary main arc contact is provided with two fixed through holes and a contact surface. The contact surface on the stationary main arc contact, the stationary secondary arc contact on the equipotential block and the stationary main contact on the stationary contact extend in the same direction.

[0017] The arc-inducing plate is provided with a hollow hole and a supporting corner. The arc-inducing plate is placed on the equipotential block. The corner plate is connected to the bottom of the stationary busbar on the stationary contact.

[0018] Preferably, the contact surface of the stationary main arc contact is electrically connected to the equipotential block, and the stationary main arc contact is mounted on the pre-set concave mounting surface of the equipotential block and fixed by a hexagonal three-way screw. The concave mounting surface provides limiting and pressure bearing for the stationary main arc contact.

[0019] Preferably, the stationary secondary arc contact and the equipotential block are an integral structure, and the contact surface on the stationary main arc contact, the stationary secondary arc contact and the stationary main contact extend in the same direction, and the contact surface on the stationary main arc contact is higher than the stationary secondary arc contact, and the stationary secondary arc contact is higher than the stationary main contact.

[0020] Preferably, the top of the stationary main arc contact passes through the hollow hole of the arc-initiating plate, and one side abuts against the support corner.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] This invention employs a riveting process for the main arc contact, which completely avoids the problem of significantly reduced electrical life or even short-circuit breaking failure caused by arc contact detachment. Furthermore, the arc-initiating surface and the main contact surface form an "L"-shaped arc-resistant surface, which is resistant to arc erosion not only on the main contact surface but also on the top of the contact during breaking, resulting in a longer service life. At the same time, the double-arc contact design is adopted, with the main arc contact made of an arc-resistant alloy material. After the main arc contact fails due to arc erosion, the secondary arc contact then performs the first-close-then-break function, which can reliably improve the electrical life of the circuit breaker. Attached Figure Description

[0023] Figure 1 A schematic diagram of the overall structure of this utility model;

[0024] Figure 2 A front view of the overall structure of this utility model;

[0025] Figure 3 A schematic diagram of the moving contact assembly structure of this utility model;

[0026] Figure 4 The structural diagram and assembly schematic diagram of the long moving contact in this utility model;

[0027] Figure 5 A schematic diagram of the structure of the long conductive sheet in this utility model;

[0028] Figure 6 A schematic diagram of the structure of the moving main arc contact in this utility model;

[0029] Figure 7 A schematic diagram of the static contact assembly in this utility model;

[0030] Figure 8 Exploded view of the stationary contact assembly in this utility model;

[0031] Figure 9 A schematic diagram of the assembly of the static main arc contact and the equipotential block in this utility model;

[0032] Figure 10 A schematic diagram of the structure of the stationary main arc contact in this utility model;

[0033] Figure 11 A schematic diagram of the structure of the medium potential block of this utility model;

[0034] Figure 12A schematic diagram of the arc-drawing plate in this utility model.

[0035] In the diagram: 10. Moving contact assembly; 11. Short moving contact; 12. Long moving contact; 13. Shaft; 111. Moving main contact; 112. Short conductive sheet; 121. Long conductive sheet; 122. Moving main arc contact; 123. Rivet; 1211. Moving secondary arc contact; 1212. Pressure bearing surface; 1213. First fixing hole; 1221. Second fixing hole; 1222. Arc-initiating surface; 1223. Main contact surface; 20. Stationary contact assembly 21. Arc-starting plate; 22. Stationary main arc contact; 23. Equipotential block; 24. Stationary contact; 25. Angle plate; 26. Internal hexagonal head screw; 27. External hexagonal head screw; 28. Nut; 211. Hollow hole; 212. Support angle; 221. Fixing through hole; 222. Contact surface; 231. Concave mounting surface; 232. Threaded through hole; 233. Stationary secondary arc contact; 241. Stationary main contact; 242. Stationary busbar. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] Please see Figure 1-12 This utility model provides a contact structure to improve the electrical life of a circuit breaker, including a moving contact assembly 10 and a stationary contact assembly 20, wherein the moving contact assembly 10 contacts the stationary contact assembly 20 through an operating mechanism;

[0038] By installing the moving contact assembly 10 and the stationary contact assembly 20 in a corresponding manner, the basic assembly of the circuit breaker contact system is realized, providing structural support for the subsequent connection and disconnection of the circuit, and achieving the effect of ensuring that all components of the contact system work together and meeting the basic functional requirements of the circuit breaker.

[0039] In an alternative embodiment, the moving contact assembly 10 includes multiple short moving contacts 11, multiple long moving contacts 12, and a shaft 13 connecting them.

[0040] By setting multiple short moving contacts 11 and multiple long moving contacts 12, and connecting them into a whole moving contact assembly 10 using a shaft 13, the conductivity and structural stability of the moving contact assembly are enhanced, avoiding the problem of a single contact being easily damaged under high current, thus achieving the effect of improving the overall performance of the moving contact assembly and adapting to different current conditions.

[0041] In an optional embodiment: the short moving contact 11 is composed of a moving main contact 111 and a short conductive sheet 112, and the long moving contact 12 is composed of a long conductive sheet 121, a moving main arc contact 122 and a rivet 123, wherein the moving main arc contact 122 is riveted and fixed to the long conductive sheet 121 by the rivet 123. Both the short conductive sheet 112 and the long conductive sheet 121 are provided with moving secondary arc contacts 1211. The moving secondary arc contacts 1211 and the conductive sheet are integrally structured, wherein the moving main arc contact 122 is positioned higher than the moving secondary arc contact 1211.

[0042] It should be noted that by splitting the short moving contact 11 into the moving main contact 111 and the short conductive piece 112, and the long moving contact 12 into the long conductive piece 121, the moving main arc contact 122 and the rivet 123, and fixing the moving main arc contact 122 by riveting, while setting the moving auxiliary arc contact 1211 of an integrated structure and controlling the height of the moving main arc contact 122, not only is the reliability of the connection of each component guaranteed and the problem of easy detachment of welded arc contacts avoided, but the design of double arc contacts is also realized, which achieves the effect of extending the service life of the contacts and improving the electrical life of the circuit breaker.

[0043] In an optional embodiment, the moving main arc contact 122 has two second fixing holes 1221 corresponding to the rivets 123, and the rivets 123 pass through the second fixing holes 1221 and are fixed to the long conductive sheet 121.

[0044] It should be noted that by opening a second fixing hole 1221 on the moving main arc contact 122 that matches the rivet 123, the rivet 123 can accurately pass through the hole to fix the moving main arc contact 122 and the long conductive sheet 121, ensuring the accuracy and firmness of the connection between the two, preventing the moving main arc contact 122 from shifting or falling off during use, and achieving the effect of improving the connection stability between the moving main arc contact 122 and the long conductive sheet 121.

[0045] In an optional embodiment: the moving main arc contact 122 is provided with an arc-initiating surface 1222 and a main contact surface 1223, and the arc-initiating surface 1222 and the main contact surface 1223 form an "L"-shaped arc-resistant surface.

[0046] It should be noted that by setting an arc-initiating surface 1222 and a main contact surface 1223 on the moving main arc contact 122, and forming an "L"-shaped arc-resistant surface, its ability to resist arc damage is improved, the service life of the moving main arc contact 122 is extended, and the electrical life of the circuit breaker is further improved.

[0047] In an optional embodiment: the long conductive sheet 121 is provided with a pressure bearing surface 1212, and two first fixing holes 1213 are provided on the pressure bearing surface 1212. The rivet 123 passes through the second fixing hole 1221 on the moving main arc contact 122 and is fixed with the first fixing hole 1213.

[0048] It should be noted that by setting a pressure-bearing surface 1212 on the long conductive sheet 121, the pressure resistance of the long conductive sheet 121 is enhanced, preventing it from deforming during multiple opening and closing processes. At the same time, a first fixing hole 1213 is opened on the pressure-bearing surface 1212, which, together with the rivet 123 and the second fixing hole 1221 of the moving main arc contact 122, is used to fix it, further ensuring the stability of the connection between the moving main arc contact 122 and the long conductive sheet 121, thus achieving the effect of improving the structural strength of the long conductive sheet 121 and the connection reliability of the moving main arc contact 122.

[0049] In an optional embodiment: the stationary contact assembly 20 includes an arc-starting plate 21, a stationary main arc contact 22, an equipotential block 23, a stationary contact 24, a corner plate 25, an internal hexagonal head screw 26, an external hexagonal head screw 27, and a nut 28.

[0050] It should be noted that by combining components such as the arc-starting plate 21, the stationary main arc contact 22, the equipotential block 23, the stationary contact 24, and the angle plate 25 with corresponding screws and nuts to form the stationary contact assembly 20, a complete stationary contact system is constructed. Each component has a clear division of labor and works in coordination, which provides a guarantee for cooperating with the moving contact assembly 10 to realize the circuit opening and closing, and achieves the effect of ensuring that the stationary contact assembly 20 has complete functions and meets the working requirements of the circuit breaker.

[0051] In an optional embodiment: the arc-starting plate 21, the equipotential block 23, the stationary contact 24, and the angle plate 25 are assembled sequentially from bottom to top and fixed by the nut 28 and the external hexagonal three-way combination screw 27. The stationary main arc contact 22 is fixed to the equipotential block 23 by the internal hexagonal three-way combination screw 26.

[0052] It should be noted that by assembling the arc-starting plate 21, equipotential block 23, stationary contact 24, and angle plate 25 in a specific order, and fixing them with nuts 28 and external hexagonal head screws 27 and internal hexagonal head screws 26 respectively, the firmness of the connection between the components of the stationary contact assembly 20 and the accuracy of the position are ensured, avoiding the loosening of components from affecting the normal operation of the circuit breaker, and achieving the effect of improving the overall structural stability of the stationary contact assembly 20.

[0053] In an optional embodiment: the stationary contact 24 includes a stationary busbar 242 and a stationary main contact 241 located at its end. An equipotential block 23 is mounted on the stationary contact 24. The equipotential block 23 is provided with a stationary secondary arc contact 233, two threaded through holes 232 and a concave mounting surface 231.

[0054] It should be noted that by designing the stationary contact 24 as a combination of stationary busbar 242 and stationary main contact 241, the conductivity and contact function of the stationary contact 24 are guaranteed. The equipotential block 23 with stationary secondary arc contact 233, threaded through hole 232 and concave mounting surface 231 is installed on the stationary contact 24, which not only realizes the setting of the stationary secondary arc contact, but also provides conditions for the installation of the stationary main arc contact 22, thus achieving the effect of perfecting the structure of the stationary contact assembly 20 and meeting the design and installation requirements of the double arc contact.

[0055] In an optional embodiment: the stationary main arc contact 22 is provided with two fixed through holes 221 and a contact surface 222, and the contact surface 222 on the stationary main arc contact 22, the stationary secondary arc contact 233 on the equipotential block 23 and the stationary main contact 241 on the stationary contact 24 extend in the same direction.

[0056] It should be noted that by setting a fixed through hole 221 and a contact surface 222 on the stationary main arc contact 22, and making the contact surface 222, the stationary secondary arc contact 233 and the stationary main contact 241 face the same direction, it is ensured that each contact of the stationary contact assembly 20 can accurately align with the moving contact assembly 10, ensuring the smooth connection and disconnection of the circuit, and achieving the effect of improving the accuracy of the connection between the stationary contact assembly 20 and the moving contact assembly 10.

[0057] In an optional embodiment: the arc-leading plate 21 is provided with a hollow hole 211 and a support corner 212, the arc-leading plate 21 is placed on the equipotential block 23, and the corner plate 25 is connected to the bottom of the stationary busbar 242 on the stationary contact 24.

[0058] It should be noted that by setting a hollow hole 211 and a support angle 212 on the arc-starting plate 21, the installation and positioning of the stationary main arc contact 22 are facilitated. The arc-starting plate 21 is placed on the equipotential block 23, and the angle plate 25 is connected to the bottom of the stationary busbar 242. This further improves the structure of the stationary contact assembly 20, enhances the correlation and stability between the components, and achieves the effect of improving the overall assembly rationality and structural stability of the stationary contact assembly 20.

[0059] In an optional embodiment: the contact surface 222 on the stationary main arc contact 22 forms an electrical connection with the equipotential block 23. The stationary main arc contact 22 is mounted on the pre-set concave mounting surface 231 of the equipotential block 23 and fixed by the internal hexagonal three-way combination screw 26. The concave mounting surface 231 provides limiting and pressure bearing for the stationary main arc contact 22.

[0060] It should be noted that by making the contact surface 222 of the stationary main arc contact 22 electrically connected to the equipotential block 23, the normal conduction of current is ensured. The stationary main arc contact 22 is installed on the concave mounting surface 231 and fixed with screws. At the same time, the concave mounting surface 231 plays a limiting and pressure-bearing role, ensuring the accuracy of the installation position of the stationary main arc contact 22 and its stability during use, thereby improving the electrical connection reliability and structural stability of the stationary main arc contact 22.

[0061] In an optional embodiment: the stationary secondary arc contact 233 and the equipotential block 23 are an integral structure. The contact surface 222 on the stationary main arc contact 22, the stationary secondary arc contact 233 and the stationary main contact 241 extend in the same direction, and the contact surface 222 on the stationary main arc contact 22 is higher than the stationary secondary arc contact 233, and the stationary secondary arc contact 233 is higher than the stationary main contact 241.

[0062] It should be noted that by designing the static auxiliary arc contact 233 and the equipotential block 23 as an integrated structure, the connection reliability of the static auxiliary arc contact 233 is ensured, the height sequence of each contact is controlled, and the orderly contact and separation of the contacts are achieved during the opening and closing process. This avoids the main contacts being burned by the electric arc too early, thus extending the service life of the main contacts and improving the electrical life of the circuit breaker.

[0063] In an optional embodiment: the top of the stationary main arc contact 22 passes through the hollow hole of the arc-starting plate 21, and one side abuts against the support angle 212.

[0064] It should be noted that by having the top of the stationary main arc contact 22 pass through the hollow hole of the arc-inducing plate 21 and abut against the support angle 212, the stationary main arc contact 22 is further positioned and fixed, preventing it from shaking or shifting during use, thus ensuring the normal operation of the stationary main arc contact 22 and achieving the effect of improving the installation stability and operational reliability of the stationary main arc contact 22.

[0065] The working principle of this utility model is as follows:

[0066] When the circuit breaker needs to connect the circuit, the moving contact assembly 10 moves towards the stationary contact assembly 20 under the action of the driving mechanism. Since the moving main arc contact 122 is higher than the moving auxiliary arc contact 1211, the contact surface 222 on the stationary main arc contact 22 is higher than the stationary auxiliary arc contact 233, and the stationary auxiliary arc contact 233 is higher than the stationary main contact 241, the moving main arc contact 122 and the stationary main arc contact 22 contact before the moving main contact 111 and the stationary main contact 241 (the auxiliary arc contact does not contact during this process). After the stationary main arc contact 22 is worn out, the moving auxiliary arc contact 1211 and the stationary auxiliary arc contact 233 contact before the moving main contact 111 and the stationary main contact 241, completing the circuit connection process. During the connection process, this orderly contact sequence avoids the main contacts directly bearing the large current impact at the moment of connection, reducing the damage to the main contacts.

[0067] When the circuit breaker needs to disconnect the circuit, the moving contact assembly 10 moves away from the stationary contact assembly 20 under the action of the drive mechanism. The moving main arc contact 122 separates from the stationary main arc contact 22 after the moving main contact 111 separates from the stationary main contact 241 (during this process, the secondary arc contact does not contact). After the stationary main arc contact 233 is worn out, the moving secondary arc contact 1211 separates from the stationary secondary arc contact 233 after the moving main contact 111 separates from the stationary main contact 241. During the separation process, because the moving main arc contact 122 and the stationary main arc contact 22 are made of arc-resistant material, and the arc-initiating surface 1222 and the main contact surface... The 1223 form an "L"-shaped arc-resistant surface, which can withstand the arc erosion generated during separation. When the moving main arc contact 122 and the stationary main arc contact 22 fail due to long-term use and erosion, the moving auxiliary arc contact 1211 and the stationary auxiliary arc contact 233 can continue to play the role of closing first and then opening, further protecting the main contacts and extending the electrical life of the circuit breaker. At the same time, the arc-initiating plate 21 can guide the arc to extinguish quickly, reducing the continuous erosion of the contacts by the arc. The corner plate 25 enhances the structural stability of the stationary contact assembly 20, ensuring that the entire contact system works stably and reliably.

[0068] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A contact structure for improving the electrical life of a circuit breaker, characterized in that: It includes a moving contact assembly (10) and a stationary contact assembly (20), wherein the moving contact assembly (10) contacts the stationary contact assembly (20) through an operating mechanism; The moving contact assembly (10) includes multiple short moving contacts (11), multiple long moving contacts (12), and a shaft (13) connecting them; The short moving contact (11) is composed of a moving main contact (111) and a short conductive sheet (112). The long moving contact (12) is composed of a long conductive sheet (121), a moving main arc contact (122), and a rivet (123). The moving main arc contact (122) is riveted and fixed to the long conductive sheet (121) by the rivet (123). Both the short conductive sheet (112) and the long conductive sheet (121) are provided with moving secondary arc contacts (1211). The moving secondary arc contacts (1211) and the conductive sheet are an integral structure. The moving main arc contact (122) is positioned higher than the moving secondary arc contact (1211).

2. The contact structure for improving the electrical life of a circuit breaker according to claim 1, characterized in that: The moving main arc contact (122) has two second fixing holes (1221) corresponding to the rivet (123). The rivet (123) passes through the second fixing holes (1221) and is fixed to the long conductive sheet (121).

3. The contact structure for improving the electrical life of a circuit breaker according to claim 1, characterized in that: The moving main arc contact (122) is provided with an arc-initiating surface (1222) and a main contact surface (1223), and the arc-initiating surface (1222) and the main contact surface (1223) form an "L"-shaped arc-resistant surface.

4. The contact structure for improving the electrical life of a circuit breaker according to claim 2, characterized in that: The long conductive sheet (121) is provided with a pressure bearing surface (1212), and two first fixing holes (1213) are opened on the pressure bearing surface (1212). The rivet (123) passes through the second fixing hole (1221) on the moving main arc contact (122) and is fixed with the first fixing hole (1213).

5. The contact structure for improving the electrical life of a circuit breaker according to claim 1, characterized in that: The stationary contact assembly (20) includes an arc-starting plate (21), a stationary main arc contact (22), an equipotential block (23), a stationary contact (24), a corner plate (25), an internal hexagonal three-way combination screw (26), an external hexagonal three-way combination screw (27), and a nut (28); The arc-starting plate (21), equipotential block (23), stationary contact (24) and angle plate (25) are assembled from bottom to top and fixed by nuts (28) and external hexagonal three-way combination screws (27). The stationary main arc contact (22) is fixed on the equipotential block (23) by internal hexagonal three-way combination screws (26).

6. The contact structure for improving the electrical life of a circuit breaker according to claim 5, characterized in that: The stationary contact (24) includes a stationary busbar (242) and a stationary main contact (241) located at its end. The equipotential block (23) is mounted on the stationary contact (24). The equipotential block (23) is provided with a stationary secondary arc contact (233), two threaded through holes (232), and a concave mounting surface (231). The stationary main arc contact (22) is provided with two fixed through holes (221) and a contact surface (222). The contact surface (222) on the stationary main arc contact (22), the stationary secondary arc contact (233) on the equipotential block (23) and the stationary main contact (241) on the stationary contact (24) extend in the same direction. The arc-leading plate (21) is provided with a hollow hole (211) and a support corner (212). The arc-leading plate (21) is placed on the equipotential block (23). The corner plate (25) is connected to the bottom of the stationary busbar (242) on the stationary contact (24).

7. The contact structure for improving the electrical life of a circuit breaker according to claim 6, characterized in that: The contact surface (222) of the stationary main arc contact (22) is electrically connected to the equipotential block (23). The stationary main arc contact (22) is installed on the pre-set concave mounting surface (231) of the equipotential block (23) and fixed by the internal hexagonal three-way combination screw (26). The concave mounting surface (231) provides limiting and pressure bearing for the stationary main arc contact (22).

8. The contact structure for improving the electrical life of a circuit breaker according to claim 7, characterized in that: The stationary secondary arc contact (233) and the equipotential block (23) are an integral structure. The contact surface (222) on the stationary main arc contact (22), the stationary secondary arc contact (233) and the stationary main contact (241) extend in the same direction. The contact surface (222) on the stationary main arc contact (22) is higher than the stationary secondary arc contact (233), and the stationary secondary arc contact (233) is higher than the stationary main contact (241).

9. A contact structure for improving the electrical life of a circuit breaker according to claim 8, characterized in that: The top of the static main arc contact (22) passes through the hollow hole of the arc-inducing plate (21) and abuts against the support corner (212) on one side.

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