A high breaking type measuring switch

Abstract

This application relates to the field of circuit breakers, specifically disclosing a high breaking capacity measuring switch, which includes a housing, a moving contact rotatably disposed within the housing, and a stationary contact disposed within the housing. It also includes an arc-extinguishing chamber and an arc-pulling assembly disposed on the arc-extinguishing chamber. The arc-pulling assembly is located on the side of the moving contact away from the stationary contact. The arc-pulling assembly includes a first permanent magnet and a second permanent magnet symmetrically arranged, with an arc-pulling channel formed between the first and second permanent magnets. The arc-pulling channel is located on the moving path of the moving contact. This application improves the arc-extinguishing performance of the measuring switch.

Description

Technical Field

[0001] This application relates to the field of circuit breakers, and in particular to a high breaking capacity measuring switch. Background Technology

[0002] A measuring switch is a low-voltage switching device equipped with a high-precision current sensor and measuring unit. It is used to realize the normal connection and disconnection or overload and short circuit protection functions of power distribution lines, and can realize local or remote data interaction.

[0003] When the measuring switch is opened, the moving contact separates from the stationary contact, and an electric arc is generated between them. The electric arc enters the arc-extinguishing chamber, where each arc-extinguishing grid divides the arc into multiple short arc segments, so that the arc voltage between two adjacent arc-extinguishing grids is reduced to below the arc combustion voltage, and the arc-extinguishing grids absorb heat, thereby extinguishing the arc.

[0004] In the process of developing this application, the inventors discovered that the technology has at least the following problems: When the existing measuring switch is opened, the arcing relies solely on the magnetic force of the arc itself, resulting in poor arcing effect. This means that only a few arc-extinguishing grid plates that are close to the stationary contact can play an arc-extinguishing role, affecting the arc-extinguishing performance of the measuring switch. Summary of the Invention

[0005] To improve the arc-extinguishing performance of a measuring switch, this application provides a high breaking capacity measuring switch.

[0006] The high breaking capacity measuring switch provided in this application adopts the following technical solution:

[0007] A high breaking capacity measuring switch includes a housing, a moving contact rotatably disposed within the housing, and a stationary contact disposed within the housing. It also includes an arc-extinguishing chamber and an arc-drawing assembly disposed on the arc-extinguishing chamber. The arc-drawing assembly is located on the side of the moving contact away from the stationary contact. The arc-drawing assembly includes a first permanent magnet and a second permanent magnet arranged symmetrically. An arc-drawing channel is formed between the first permanent magnet and the second permanent magnet, and the arc-drawing channel is located on the moving path of the moving contact.

[0008] By adopting the above technical solution, when using the measuring switch of this application, the stationary contact and the moving contact need to be connected to the same AC circuit. When the measuring switch of this application is opened, the moving contact rotates, so that the end of the moving contact separates from the end of the stationary contact. At this time, an electric arc is generated between the end of the moving contact and the end of the stationary contact. After the electric arc enters the arc-extinguishing chamber, it will cause electroslag to be generated on the arc-extinguishing grid plate in the arc-extinguishing chamber.

[0009] The first and second permanent magnets are symmetrically arranged, so that the magnetic poles of the first and second permanent magnets are also symmetrically arranged, in order to prevent the direction of the magnetic field lines in the arcing channel from the first permanent magnet to the second permanent magnet or from the second permanent magnet to the first permanent magnet, that is, to prevent the direction of the magnetic field lines in the arcing channel from being perpendicular to the rotation direction of the moving contact.

[0010] If the magnetic field lines within the arcing channel are perpendicular to the direction of rotation of the moving contact, the arc will experience an Ampere force when it enters the arcing channel. However, because the direction of current in an AC circuit changes, the direction of the Ampere force on the arc also changes. Specifically, when positive charges flow in one direction, the arc experiences a force moving away from the stationary contact; when positive charges flow in the other direction, the arc experiences a force moving closer to the stationary contact.

[0011] The symmetrically arranged first and second permanent magnets avoid the aforementioned problems, ensuring that the arc is not subjected to Ampere force when entering the arc-drawing channel. The first and second permanent magnets only serve to attract the electroslag. Firstly, this restricts the irregular movement of the electroslag, minimizing the possibility of it moving between the moving and stationary contacts and adhering to them, thus affecting the closing contact. Secondly, because the arc-drawing assembly is located on the side of the stationary contact away from the moving contact, attracting the electroslag stretches the arc's end away from the stationary contact, allowing the arc length to expand rapidly and improving the arc-drawing effect.

[0012] The above structure ensures that the arc-extinguishing grid plates, even those farther from the stationary contact, can still extinguish the arc. This protects the arc-extinguishing grid plates closer to the stationary contact, effectively extending their service life. Furthermore, the addition of arc-extinguishing grid plates along the arc's stretching direction allows the measuring switch to extinguish the arc more quickly. In summary, this design improves the arc-extinguishing performance of the measuring switch in this application.

[0013] Optionally, the two magnetic poles of the first permanent magnet are located at the end of the first permanent magnet closer to the stationary contact and the end of the first permanent magnet farther from the stationary contact, respectively.

[0014] By adopting the above technical solution, since the first and second permanent magnets are symmetrically arranged, that is, the two magnetic poles of the second permanent magnet are located at the end of the second permanent magnet closer to the stationary contact and the end of the second permanent magnet farther from the stationary contact, the magnetic field lines in the arc-drawing channel extend along the direction from the stationary contact to the distance from the stationary contact, further improving the attraction effect on electroslag and electric arc.

[0015] Optionally, the end of the stationary contact that abuts against the moving contact is movably disposed within the housing, and the housing is provided with an elastic element that drives the end of the stationary contact that abuts against the moving contact to reset.

[0016] By adopting the above technical solution, when the measuring switch of this application is opened, an electric repulsive force is generated between the moving contact and the stationary contact, thereby pushing the end of the stationary contact that is in contact with the moving contact to move away from the moving contact. This configuration increases the opening distance between the moving contact and the stationary contact, allowing the electric arc generated between the moving contacts to stretch to a greater length in a shorter time, thereby accelerating the extinguishing of the arc and further improving the arc extinguishing performance of the measuring switch of this application.

[0017] Optionally, the stationary contact is rotatably mounted on the housing, a limit block is provided on the stationary contact, and a stop block is provided on the housing, with the stop block located on the moving path of the limit block.

[0018] By adopting the above technical solution, when the stationary contact is reset by the elastic element, the stop block is located on the moving path of the limit block and the limit block is connected to the stationary contact, thus playing a positioning role in the reset of the stationary contact and facilitating the reset of the stationary contact.

[0019] Optionally, the moving contact and / or stationary contact are provided with an air-blowing component that can generate gas when heated.

[0020] By adopting the above technical solution, when the measuring switch of this application is opened, the electric arc generated between the moving and stationary contacts brings enormous heat. This heat is transferred to the stationary contact, where the air-blowing component generates gas. The gas generated by the air-blowing component blows the electric arc, accelerating its stretching and movement towards the arc-extinguishing chamber, thereby accelerating the arc extinguishing speed and further improving the arc-extinguishing performance of the measuring switch of this application. Similarly, providing an air-blowing component on the moving contact, or on both the moving and stationary contacts, can achieve the same effect.

[0021] Optionally, the air blowing component includes a side plate and a top plate connected to the side plate, wherein the end faces of the side plate and the top plate near the stationary contact are both in contact with the stationary contact.

[0022] By adopting the above technical solution, compared with heat transfer through air, since the end faces of the side plate and the top plate near the stationary contact are in contact with the stationary contact, it helps the heat to be transferred from the stationary contact to the air blowing component, so that the air blowing component can generate air in a shorter time when the measuring switch of this application is opened.

[0023] Optionally, both the top plate and the side plate are elastic. There are two side plates. Each side plate includes a fixed part, a pressing part that abuts against the stationary contact, and an inclined part that connects the fixed part and the pressing part. The top plate is connected between the two fixed parts. The inclined part is inclined. When the side plate is in its natural state, the distance between the two pressing parts is less than the width of the stationary contact.

[0024] The top plate includes a connecting part connected to the fixing part and a convex arc part with one end connected to the connecting part. The convex arc part protrudes toward the stationary contact and applies a force toward the stationary contact to the stationary contact.

[0025] By adopting the above technical solution, when the side plate is in its natural state, i.e., when the air-blowing component is not installed on the stationary contact, the distance between the two pressing parts is less than the width of the stationary contact. Since both the top plate and the side plate are elastic, when the air-blowing component is installed on the stationary contact, the two inclined parts deform in opposite directions and apply force to the stationary contact through the pressing parts, ensuring that the pressing parts press firmly against the stationary contact; the connection between the convex arc part and the connecting part bends away from the stationary contact, ensuring that the convex arc part presses firmly against the stationary contact. With this configuration, even after prolonged use of the measuring switch of this application, where the pressing parts and convex arc parts melt due to the heat of the stationary contact at their contact points, the air-blowing component can still maintain the pressing parts and convex arc parts pressing firmly against the stationary contact, i.e., the end faces of the pressing parts and convex arc parts closest to the stationary contact are in contact with the stationary contact. This effectively ensures heat transfer on the stationary contact, thereby ensuring the air-blowing component's air production speed.

[0026] Optionally, the top plate is provided with a connecting hook that bends toward the stationary contact, and the side wall of the stationary contact is provided with an arc-shaped protrusion, and the connecting hook is hooked onto the arc-shaped protrusion and fits against the arc-shaped protrusion.

[0027] By adopting the above technical solution, the connection hook improves the fit between the top plate's end face near the stationary contact and the stationary contact. Even after prolonged use of the measuring switch in this application, if the contact area between the top plate and the stationary contact melts, the connection hook on the arc-shaped protrusion can apply a force to the top plate towards the stationary contact, ensuring that the top plate's end face near the stationary contact maintains its fit. This guarantees heat transfer to the stationary contact and further ensures the gas generation speed of the air-blowing component.

[0028] Optionally, the arc-extinguishing chamber includes an arc-extinguishing cover and an arc-extinguishing grid plate. The arc-extinguishing cover has a contact cavity and a grid plate cavity that communicates with the contact cavity. The ends of the moving contact and the stationary contact are both located in the contact cavity, and the ends of the arc-extinguishing grid plate are located in the grid plate cavity.

[0029] By adopting the above technical solution, the arc-extinguishing chamber, in this configuration, firstly, covers the ends of the stationary and moving contacts within the contact cavity, restricting the direction of arc movement and minimizing the risk of the arc moving into the housing or re-igniting. Secondly, it restricts the flow direction of the gas generated by the air-blowing component, minimizing the risk of electroslag generated by the arc-extinguishing grid entering the internal chamber of the measuring switch, thereby protecting the other internal electrical components of the measuring switch. Thirdly, it improves the relative airtightness of the arc-extinguishing chamber, allowing the gas pressure inside the chamber to increase more rapidly in a short period when the air-blowing component generates the same volume of gas, thereby increasing the flow velocity of the gas generated by the air-blowing component, which in turn increases the arc stretching amplitude and movement speed, further improving the arc-extinguishing performance of the measuring switch.

[0030] Optionally, the arc-extinguishing grid includes a main grid and grid feet connected to the main grid. The arc-extinguishing cover includes a main cover with a contact cavity and a sub-plate connected to the main cover. The grid cavity is formed by the main cover and the sub-plate. The main grid is located in the grid cavity. The sub-plate and the main cover also form a pin groove that communicates with the contact cavity. The grid feet are inserted into the pin groove.

[0031] By adopting the above technical solution, when installing the arc-extinguishing grid, the grid feet are inserted into the pin slots, and the main grid is installed into the grid cavity. This configuration, along with the sub-plate, improves the ease of installation of the arc-extinguishing grid and further enhances the relative airtightness of the arc-extinguishing cover, thereby improving the arc-extinguishing performance of the measuring switch of this application.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. The arc-pulling assembly restricts the irregular movement of the electroslag, protecting the moving contacts, stationary contacts, and other electrical components within the housing. Furthermore, the electroslag pulls the arc, allowing its length to expand rapidly and improving the arc-pulling effect. In summary, the arc-pulling assembly enhances the arc-extinguishing performance of the measuring switch in this application.

[0034] 2. By using a stationary contact that is movably disposed within the housing and an elastic element that drives the stationary contact to reset, the opening distance between the moving contact and the stationary contact is increased, so that the arc can be stretched to a greater length, further improving the arc extinguishing performance of the measuring switch of this application;

[0035] 3. Compared with existing arc-extinguishing hoods, the main hood and the auxiliary plate improve the relative airtightness of the arc-extinguishing hood, so that when the gas blowing component generates the same volume of gas, the air pressure in the arc-extinguishing chamber can be increased to a greater extent in a short period of time, thereby increasing the flow rate of the gas generated by the gas blowing component and thus improving the arc-extinguishing performance of the measuring switch of this application. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this application.

[0037] Figure 2 This is a schematic diagram of the structure in Embodiment 1 of this application after removing the top cover and the middle cover.

[0038] Figure 3 This is a schematic diagram of the wiring module highlighted in Embodiment 1 of this application.

[0039] Figure 4 This is a cross-sectional schematic diagram highlighting the stationary contact in Embodiment 1 of this application.

[0040] Figure 5 This is an exploded schematic diagram highlighting the air-blowing component in Embodiment 1 of this application.

[0041] Figure 6 This is an explosion diagram highlighting the arc-extinguishing chamber in Embodiment 1 of this application.

[0042] Figure 7 This is a schematic diagram highlighting the structure of the air-blowing component and the stationary contact in Embodiment 2 of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Housing; 11. Base; 12. Middle cover; 13. Top cover; 14. First terminal block; 15. Second terminal block; 2. Control mechanism; 21. Operating component; 22. Tripping component; 3. Moving contact; 4. Stationary contact; 41. Arc-shaped protrusion; 42. Limiting block; 43. Elastic element; 5. Mounting base; 51. Stop block; 52. Mounting cover; 6. Arc extinguishing chamber; 61. Arc extinguishing cover; 611. Main cover; 612. Sub-plate; 613. Contact Head cavity; 614, pin slot; 615, grid cavity; 616, magnet cavity; 62, arc-extinguishing grid; 621, main grid; 622, grid foot; 7, arc-drawing assembly; 71, first permanent magnet; 72, second permanent magnet; 73, arc-drawing channel; 8, air-blowing component; 81, side plate; 811, fixing part; 812, inclined part; 813, pressing part; 82, top plate; 821, connecting part; 822, convex arc part; 83, connecting hook. Detailed Implementation

[0045] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0046] This application discloses a high breaking capacity measurement switch.

[0047] Example 1:

[0048] Reference Figure 1 , Figure 2The high breaking capacity measurement switch includes a housing 1, a control mechanism 2 for controlling the opening and closing of the measurement switch, and three sets of wiring modules disposed in the housing 1 for connecting the circuit.

[0049] Reference Figure 1 The housing 1 includes a base 11, a middle cover 12 and an upper cover 13 connected in sequence. By increasing the height of the base 11 and reducing the height of the middle cover 12, the break point of the housing 1 is raised, i.e., high break point. The high break point housing 1 can effectively improve the utilization rate of the housing 1.

[0050] Reference Figure 3 , Figure 4 The wiring module includes a first terminal block 14, a second terminal block 15, a moving contact 3, a stationary contact 4, a mounting base 5, an arc-extinguishing chamber 6, and an arc-drawing assembly 7. The moving contact 3 is electrically connected to the first terminal block 14, and the connection between the moving contact 3 and the first terminal block 14 can be achieved using a wire connection or a flexible copper connection. The stationary contact 4 is electrically connected to the second terminal block 15 via a copper sheet. In other embodiments, the connection between the stationary contact 4 and the second terminal block 15 can also be achieved using a wire connection or a flexible copper connection.

[0051] Reference Figure 2 , Figure 4 One end of the moving contact 3 is rotatably disposed within the base 11, and the other end of the moving contact 3 is used to abut against the stationary contact 4. The mounting base 5 is fixed within the base 11, and one end of the stationary contact 4 is hinged to the mounting base 5, with the other end of the stationary contact 4 used to abut against the moving contact 3. In other embodiments, the stationary contact 4 may also be slidably disposed within the base 11; any method that allows the stationary contact 4 to be movably disposed within the base 11 in a direction approaching or moving away from the moving contact 3 is acceptable.

[0052] Reference Figure 4 , Figure 5 An arc-shaped protrusion 41 and a limiting block 42 are integrally formed on the side wall of the stationary contact 4. The arc-shaped protrusion 41 increases the structural strength of the hinge of the stationary contact 4. A stop block 51 is integrally formed on the mounting base 5, and the stop block 51 is located on the moving path of the limiting block 42. An elastic member 43 is connected to the stationary contact 4 to drive the end of the stationary contact 4 that abuts against the moving contact 3 to return to its original position. The elastic member 43 is a torsion spring. The two force-bearing ends of the elastic member 43 abut against the mounting base 5 and the stationary contact 4 respectively, so as to apply a force to the stationary contact 4 to rotate in the direction of the moving contact 3. At the same time, the limiting block 42 can remain in contact with the stop block 51 when the stationary contact 4 is not subjected to external force.

[0053] Reference Figure 4 , Figure 5An air-blowing component 8, capable of generating gas upon heating, is fixed on the stationary contact 4. In other embodiments, the air-blowing component 8 can also be disposed on the moving contact 3, or both the stationary contact 4 and the moving contact 3 can be provided with air-blowing components 8. The air-blowing component 8 is made of POM to give it a certain degree of elasticity. In other embodiments, the air-blowing component 8 can also be made of materials such as PA46; any material capable of generating gas upon receiving heat from the stationary contact 4 is acceptable.

[0054] Reference Figure 5 The air blowing component 8 includes two oppositely arranged side plates 81 and a top plate 82 located between the two side plates 81. The top plate 82 is integrally formed with the two side plates 81, and the end faces of the side plates 81 and the top plate 82 near the stationary contact 4 are in contact with the stationary contact 4.

[0055] Reference Figure 3 , Figure 4 The arc-extinguishing chamber 6 includes an arc-extinguishing cover 61 and multiple arc-extinguishing grid plates 62. The arc-extinguishing cover 61 includes a main cover 611 and two opposing auxiliary plates 612. The main cover 611 has a contact cavity 613 and two symmetrically arranged magnet cavities 616, which are located on both sides of the contact cavity 613. The ends of the moving contact 3 and the stationary contact 4 are rotatably disposed in the contact cavity 613. A mounting cover 52 is fixed on the mounting base 5. The mounting cover 52 covers the ends of the stationary contact 4 and the air blowing component 8, further improving the relative airtightness of the arc-extinguishing cover 61.

[0056] Reference Figure 6 Two auxiliary plates 612 are located on both sides of the main cover 611, and both auxiliary plates 612 are fixedly connected to the main cover 611. Both auxiliary plates 612 and the main cover 611 form multiple pin slots 614. One pin slot 614 formed by the auxiliary plate 612 and the main cover 611 is located on one side of the contact cavity 613, and the other pin slot 614 formed by the auxiliary plate 612 and the main cover 611 is located on the other side of the contact cavity 613. The main cover 611 and the two auxiliary plates 612 together form a grid cavity 615 that communicates with the contact cavity 613.

[0057] Reference Figure 6 The arc-extinguishing grid 62 includes a main grid 621 and two grid feet 622 integrally formed at both ends of the main grid 621. The main grid 621 is located in the grid cavity 615, and the two grid feet 622 connected to the main grid 621 are respectively inserted into the insertion slots 614 located on both sides of the contact cavity 613.

[0058] Reference Figure 3 , Figure 4The arc-pulling assembly 7 is disposed on the arc-extinguishing chamber 6 and is located on the side of the moving contact 3 away from the stationary contact 4. The arc-pulling assembly 7 includes a first permanent magnet 71 and a second permanent magnet 72. The first permanent magnet 71 and the second permanent magnet 72 are respectively inserted into different magnet cavities 616 so that the first permanent magnet 71 and the second permanent magnet 72 are respectively located on both sides of the contact cavity 613.

[0059] Reference Figure 3 , Figure 4 Both the first permanent magnet 71 and the second permanent magnet 72 are inclined along the rotation direction of the ends of the moving contact 3 that abut against the stationary contact 4. The two magnetic poles of the first permanent magnet 71 are located at the end of the first permanent magnet 71 closer to the stationary contact 4 and the end of the first permanent magnet 71 farther from the stationary contact 4, respectively. The first permanent magnet 71 and the second permanent magnet 72 are symmetrically arranged. An arc-drawing channel 73 is formed between the first permanent magnet 71 and the second permanent magnet 72, and the arc-drawing channel 73 is located on the moving path of the moving contact 3.

[0060] Reference Figure 1 , Figure 2 The control mechanism 2 is mounted on the housing 1. The control mechanism 2 includes an operating component 21 for driving the rotation of each moving contact 3 and a tripping component 22 for realizing the tripping function. The operating component 21 and the tripping component 22 are conventional settings in measuring switches and will not be described in detail here.

[0061] The implementation principle of Example 1 is as follows: When the measuring switch of this application is opened, the moving contact 3 rotates away from the stationary contact 4, generating an electric arc and an electric repulsive force between the moving contact 3 and the stationary contact 4. The electric repulsive force pushes the stationary contact 4 to rotate away from the moving contact 3, thereby compressing the elastic element 43. The heat of the electric arc is transferred to the air blowing element 8 through the stationary contact 4. The air blowing element 8 is heated and generates gas to increase the arc's stretching amplitude and accelerate its movement speed. The arc-drawing channel 73 applies force to the arc to stretch it away from the stationary contact 4. At the same time, the first permanent magnet 71 and the second permanent magnet 72 attract the electroslag to further extend the arc length and arc speed.

[0062] The above structure effectively improves the arc-extinguishing performance of the measuring switch in this application.

[0063] Example 2:

[0064] Reference Figure 7 The difference between this embodiment and Embodiment 1 is that the side plate 81 includes an integrally formed fixing part 811, an inclined part 812, and a pressing part 813. The inclined part 812 is inclined and connects the fixing part 811 and the pressing part 813. The top plate 82 includes a connecting part 821 and a convex arc part 822 connected at one end to the connecting part 821. The connecting part 821 and the convex arc part 822 are integrally formed.

[0065] Reference Figure 7 The connecting part 821 is located between the two fixing parts 811, and the connecting part 821 is integrally formed with the two fixing parts 811. When the side plate 81 is in its natural state, that is, when the air blowing part 8 is not installed on the stationary contact 4, the distance between the two pressing parts 813 is less than the width of the stationary contact 4, so that when the air blowing part 8 is installed on the stationary contact 4, the two inclined parts 812 deform and the two pressing parts 813 press against the stationary contact 4.

[0066] Reference Figure 7 The convex arc portion 822 protrudes towards the stationary contact 4 and applies a force toward the stationary contact 4. A connecting hook 83, integrally formed on the convex arc portion 822, is provided on the side of the convex arc portion 822 away from the connecting portion 821. The connecting hook 83 bends toward the stationary contact 4, hooks onto the arc-shaped protrusion 41, and fits against the arc-shaped protrusion 41.

[0067] The implementation principle of Example 2 is as follows: After the contact point between the air blowing component 8 and the stationary contact 4 is heated and melted, the pressing part 813 can maintain its contact with the stationary contact 4 under the action of the inclined part 812; under the action of the connecting hook 83 and the convex arc part 822, both the convex arc part 822 and the connecting part 821 can maintain their contact with the stationary contact 4, thereby ensuring the fit between the air blowing component 8 and the stationary contact 4, and thus ensuring the air production speed of the air blowing component 8.

[0068] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high breaking capacity measuring switch, comprising a housing (1), a moving contact (3) rotatably disposed within the housing (1), and a stationary contact (4) disposed within the housing (1), characterized in that: It also includes an arc-extinguishing chamber (6) and an arc-drawing assembly (7) disposed on the arc-extinguishing chamber (6). The arc-drawing assembly (7) is located on the side of the moving contact (3) away from the stationary contact (4). The arc-drawing assembly (7) includes a first permanent magnet (71) and a second permanent magnet (72) arranged symmetrically. An arc-drawing channel (73) is formed between the first permanent magnet (71) and the second permanent magnet (72). The arc-drawing channel (73) is located on the moving path of the moving contact (3). The moving contact (3) and / or the stationary contact (4) are provided with an air blowing component (8) that can generate gas when heated; The air blowing component (8) includes a side plate (81) and a top plate (82) connected to the side plate (81). The end faces of the side plate (81) and the top plate (82) near the stationary contact (4) are both in contact with the stationary contact (4). The top plate (82) and the side plate (81) are both elastic. There are two side plates (81). The side plate (81) includes a fixed part (811), a pressing part (813) that abuts against the stationary contact (4), and an inclined part (812) that connects the fixed part (811) and the pressing part (813). The top plate (82) is connected between the two fixed parts (811). The inclined part (812) is inclined. When the side plate (81) is in its natural state, the distance between the two pressing parts (813) is less than the width of the stationary contact (4). The top plate (82) includes a connecting part (821) connected to the fixing part (811) and a convex arc part (822) connected at one end to the connecting part (821). The convex arc part (822) protrudes toward the stationary contact (4) and the convex arc part (822) applies a force toward the stationary contact (4) to the stationary contact (4). The top plate (82) is provided with a connecting hook (83) that bends toward the stationary contact (4). The side wall of the stationary contact (4) is provided with an arc-shaped protrusion (41). The connecting hook (83) is hooked onto the arc-shaped protrusion (41) and fits against the arc-shaped protrusion (41).

2. The high breaking capacity measuring switch according to claim 1, characterized in that: The two magnetic poles of the first permanent magnet (71) are located at the end of the first permanent magnet (71) closer to the stationary contact (4) and the end of the first permanent magnet (71) farther away from the stationary contact (4), respectively.

3. The high breaking capacity measuring switch according to claim 1, characterized in that: The end of the stationary contact (4) that abuts against the moving contact (3) is movably disposed within the housing (1), and an elastic element (43) is provided within the housing (1) to drive the end of the stationary contact (4) that abuts against the moving contact (3) to reset.

4. A high breaking capacity measuring switch according to claim 3, characterized in that: The stationary contact (4) is rotatably mounted on the housing (1). A limit block (42) is provided on the stationary contact (4). A stop block (51) is provided on the housing (1). The stop block (51) is located on the moving path of the limit block (42).

5. A high breaking capacity measuring switch according to claim 1, characterized in that: The arc-extinguishing chamber (6) includes an arc-extinguishing cover (61) and an arc-extinguishing grid plate (62). The arc-extinguishing cover (61) has a contact cavity (613) and a grid plate cavity (615) connected to the contact cavity (613). The ends of the moving contact (3) and the stationary contact (4) are both located in the contact cavity (613), and the end of the arc-extinguishing grid plate (62) is located in the grid plate cavity (615).

6. A high breaking capacity measuring switch according to claim 5, characterized in that: The arc-extinguishing grid (62) includes a main grid (621) and grid feet (622) connected to the main grid (621). The arc-extinguishing cover (61) includes a main cover (611) with a contact cavity (613) and a sub-plate (612) connected to the main cover (611). The grid cavity (615) is formed by the main cover (611) and the sub-plate (612). The main grid (621) is located in the grid cavity (615). The sub-plate (612) and the main cover (611) also form a pin groove (614) that communicates with the contact cavity (613). The grid feet (622) are inserted into the pin groove (614).

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