Low voltage energized circuit breaker

Abstract

The utility model discloses low pressure is with the excitation type breaker, is connected on the circuit of needing protection, including copper row layer, copper row layer is fixed with mounting seat and lower cover respectively up and down, and mounting seat fixedly arranged has the gas generator, and the gas generator is provided with the striker just below, and the striker is located in the mounting seat, and the copper row is horizontally through in the copper row layer, and the copper row both ends stretches out copper row layer outside, and the copper row both ends are connected in series with the circuit of needing protection, and the copper row is located below the striker, and the copper row is provided with the pre -breaks groove with the corresponding position of striker, and the lower cover is provided with the chamber corresponding with the striker in, and is provided with arc extinguishing device in the chamber. The utility model solves the problem that arc is not divided evenly, and arc extinguishing efficiency is low.

Description

Technical Field

[0001] This utility model belongs to the technical field of circuit protection devices, and relates to low-voltage excitation circuit breakers. Background Technology

[0002] In the current field of 500V circuit protection, circuit breakers mainly rely on spring mechanisms (such as CN105097280A), electromagnetic tripping mechanisms (such as IEC 60947-2 standard), or hydraulic drive technology to achieve mechanical breaking. Currently, mechanical breaking suffers from mechanical inertia leading to delayed breaking action, making it impossible to suppress current in a very short time, potentially causing an arc explosion. Secondly, insufficient contact separation leads to arc energy accumulation, increasing the volume of the arc-extinguishing chamber and resulting in a bulky design. Furthermore, regarding arc extinguishing methods, most circuit breakers currently use vacuum arc extinguishing and interlocking plate arc extinguishing. The former is more expensive, accounting for about 50% of the total cost of the circuit breaker, while the latter, on 500V and above platforms, requires a huge number of interlocking plates, occupying significant space and incurring high costs. Moreover, under vibration conditions (GB / T 28046.3 standard), interlocking plate displacement >0.2mm leads to uneven arc segmentation and a 30% fluctuation in arc extinguishing time. Utility Model Content

[0003] The purpose of this invention is to provide a low-voltage excitation circuit breaker that solves the problems of uneven arc segmentation and low arc extinguishing efficiency.

[0004] The technical solution adopted by this utility model is a low-voltage excitation-type circuit breaker connected to the circuit to be protected. It includes a copper busbar layer, with a mounting base and a lower cover fixed above and below the copper busbar layer, respectively. A gas generator is fixedly installed on the mounting base, and a striker is installed directly below the gas generator. The striker is located in the mounting base. A copper busbar runs horizontally through the copper busbar layer, with both ends of the copper busbar extending outside the copper busbar layer. Both ends of the copper busbar are connected in series with the circuit to be protected. The copper busbar is located below the striker, and a pre-break groove is provided at the position corresponding to the striker. A chamber corresponding to the striker is provided in the lower cover, and an arc extinguishing device is provided in the chamber.

[0005] The features of this utility model also include:

[0006] Both the mounting base and the copper busbar layer are hollow structures, and the hollow structures of the mounting base and the copper busbar layer are positioned correspondingly. The striker in the mounting base extends into the copper busbar layer and can move towards the upper surface of the copper busbar.

[0007] The gas generator is a miniature gas generator.

[0008] The mounting base is covered with a metal cover.

[0009] An outer shell is fixed to the outer surface of the metal cover.

[0010] The firing pin includes a movable body, the outer surface of which is in contact with the hollow inner wall of the mounting base. The movable body is located directly below the gas generator. A cutter is fixedly installed at the bottom of the movable body, and the bottom of the cutter is directly opposite the pre-cut groove of the copper busbar.

[0011] The bottom cover seals the bottom of the copper busbar layer, and the bottom cover extends towards the copper busbar with an integral narrow slit. The integral narrow slit is located on the central axis of the bottom cover chamber. The top of the integral narrow slit is fixed in the middle position of the copper busbar pre-cut groove. The cutting blade of the firing pin has a guide groove from the bottom to the moving body. The integral narrow slit corresponds to and matches the guide groove.

[0012] The pre-break groove of the copper busbar is thinner than other parts of the copper busbar.

[0013] The arc-extinguishing device is located at the bottom of the lower cover chamber and is made of metal mesh.

[0014] The copper busbar layer is provided with two reserved slots. The depth of the reserved slots is the distance from the lower surface of the copper busbar to the lower surface of the copper busbar layer. The two reserved slots are located at corresponding positions on both sides of the cutting blade of the firing pin.

[0015] The beneficial effects of this utility model are:

[0016] This utility model of a low-voltage excitation-type circuit breaker features ultra-high-speed breaking capability, high insulation reliability, and long-term stability. Compared with existing circuit breakers, it boasts enhanced compactness and adaptability. It exhibits synergistic effects, high arc extinguishing efficiency, and narrow-slit arc extinguishing. By limiting the arc diffusion space (e.g., shrinking the narrow slit channel), it rapidly elongates the arc and increases arc resistance, accelerating cooling. The metal mesh filter divides the arc, forming multiple short arcs in series. Utilizing the near-cathode effect and dielectric cooling, it reduces the arc temperature. Furthermore, this structure also serves as an arc initiator, achieving a complete process of guiding, dividing, and extinguishing. It is small in size, has fewer components, and lower cost. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional view of the low-voltage excitation circuit breaker of this utility model before its operation;

[0019] Figure 2 This is a cross-sectional view of the low-voltage excitation circuit breaker of this utility model after it has been activated;

[0020] Figure 3 This is a top view of the low-voltage excitation circuit breaker after it has been activated;

[0021] In the diagram, 1. Outer shell, 2. Metal cover, 3. Mounting base, 4. Copper busbar layer, 5. Copper busbar, 6. Lower cover, 7. Miniature gas generator, 8. Strike pin, 9. Integrated narrow slit, 10. Metal mesh, 11. Reserved slot. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the following description of this utility model, the terms "first, second, third" are used only to distinguish similar objects and do not represent a specific order of objects. It is understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0024] Unless otherwise stated, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", etc., indicate the orientation or state relationship based on the orientation or state relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the mechanism or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this utility model.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this invention is for descriptive purposes only and is not intended to limit the scope of the invention.

[0028] Example 1

[0029] This embodiment provides a low-voltage excitation-type circuit breaker, which is connected to the circuit that needs to be protected. It includes a copper busbar layer 4, with a mounting base 3 and a lower cover 6 fixed above and below the copper busbar layer 4, respectively. A gas generator 7 is fixedly installed on the mounting base 3. The gas generator 7 provides power to the entire device. A striker 8 is installed directly below the gas generator 7 and is located in the mounting base 3.

[0030] A copper busbar 5 runs horizontally through the copper busbar layer 4. Both ends of the copper busbar 5 extend out of the copper busbar layer 4. Both ends of the copper busbar 5 are connected in series with the circuit that needs to be protected. The copper busbar 5 is located below the striker 8. A pre-break groove is provided at the position of the copper busbar 5 corresponding to the striker 8. A chamber corresponding to the striker 8 is provided in the lower cover 6. An arc extinguishing device is provided in the chamber.

[0031] This embodiment represents only a preferred implementation of the low-voltage excitation circuit breaker of this utility model. Any low-voltage excitation circuit breaker designed with similar technical features to this utility model will fall within the protection scope of the low-voltage excitation circuit breaker of this utility model.

[0032] Example 2

[0033] This embodiment provides a low-voltage excitation-type circuit breaker, which is connected to the circuit to be protected. It includes a copper busbar layer 4, with a mounting base 3 and a lower cover 6 fixed above and below the copper busbar layer 4, respectively. A gas generator 7 is fixedly installed on the mounting base 3, and a striker 8 is installed directly below the gas generator 7. The striker 8 is located in the mounting base 3. Both the mounting base 3 and the copper busbar layer 4 are hollow structures, and the hollow structures of the mounting base 3 and the copper busbar layer 4 are positioned correspondingly.

[0034] The striker 8 in the mounting base 3 extends into the copper busbar layer 4. The striker 8 can move to the upper surface of the copper busbar 5. The copper busbar 5 runs horizontally through the copper busbar layer 4. Both ends of the copper busbar 5 extend out of the copper busbar layer 4. Both ends of the copper busbar 5 are connected in series with the circuit to be protected. The copper busbar 5 is located below the striker 8. A pre-break groove is provided at the position corresponding to the striker 8. A chamber corresponding to the striker 8 is provided in the lower cover 6. An arc extinguishing device is provided in the chamber.

[0035] This embodiment represents only a preferred implementation of the low-voltage excitation circuit breaker of this utility model. Any low-voltage excitation circuit breaker designed with similar technical features to this utility model will fall within the protection scope of the low-voltage excitation circuit breaker of this utility model.

[0036] Example 3

[0037] This embodiment provides a low-voltage excitation-type circuit breaker, which is connected to the circuit that needs to be protected. It includes a copper busbar layer 4, with a mounting base 3 and a lower cover 6 fixed above and below the copper busbar layer 4, respectively. The outer surface of the mounting base 3 is covered with a metal cover 2. A gas generator 7 is fixedly installed on the mounting base 3. The gas generator 7 is a miniature gas generator. A striker 8 is located directly below the gas generator 7 and is located in the mounting base 3.

[0038] A copper busbar 5 runs horizontally through the copper busbar layer 4. Both ends of the copper busbar 5 extend out of the copper busbar layer 4. Both ends of the copper busbar 5 are connected in series with the circuit that needs to be protected. The copper busbar 5 is located below the striker 8. A pre-break groove is provided at the position of the copper busbar 5 corresponding to the striker 8. A chamber corresponding to the striker 8 is provided in the lower cover 6. An arc extinguishing device is provided in the chamber.

[0039] This embodiment represents only a preferred implementation of the low-voltage excitation circuit breaker of this utility model. Any low-voltage excitation circuit breaker designed with similar technical features to this utility model will fall within the protection scope of the low-voltage excitation circuit breaker of this utility model.

[0040] Example 4

[0041] This embodiment provides a low-voltage excitation-type circuit breaker, which is connected to the circuit to be protected. It includes a copper busbar layer 4, with a mounting base 3 and a lower cover 6 fixed above and below the copper busbar layer 4, respectively. A metal cover 2 covers the outer surface of the mounting base 3, and an outer shell 1 is fixed to the outer surface of the metal cover 2. A gas generator 7 is fixedly installed on the mounting base 3, and a striker 8 is installed directly below the gas generator 7. The striker 8 is located in the mounting base 3. Both the mounting base 3 and the copper busbar layer 4 are hollow structures, and the hollow structures of the mounting base 3 and the copper busbar layer 4 are positioned correspondingly.

[0042] The striker 8 in the mounting base 3 extends into the copper busbar layer 4. The striker 8 can move to the upper surface of the copper busbar 5. The copper busbar 5 runs horizontally through the copper busbar layer 4. Both ends of the copper busbar 5 extend out of the copper busbar layer 4. Both ends of the copper busbar 5 are connected in series with the circuit that needs to be protected. The copper busbar 5 is located below the striker 8. Pre-break slots are provided at the corresponding positions of the copper busbar 5 and the striker 8.

[0043] The outer shell 1, metal cover 2, mounting base 3, copper busbar layer 4 and lower cover 6 are all fixed with screws. The lower cover 6 has a chamber corresponding to the striker 8, and the chamber is equipped with an arc extinguishing device.

[0044] This embodiment represents only a preferred implementation of the low-voltage excitation circuit breaker of this utility model. Any low-voltage excitation circuit breaker designed with similar technical features to this utility model will fall within the protection scope of the low-voltage excitation circuit breaker of this utility model.

[0045] Example 5

[0046] This embodiment provides a low-voltage excitation-type circuit breaker, which is connected to the circuit to be protected. It includes a copper busbar layer 4, with a mounting base 3 and a lower cover 6 fixed above and below the copper busbar layer 4, respectively. A gas generator 7 is fixedly installed on the mounting base 3, and a striker 8 is installed directly below the gas generator 7. The striker 8 is located in the mounting base 3. Both the mounting base 3 and the copper busbar layer 4 are hollow structures, and the hollow structures of the mounting base 3 and the copper busbar layer 4 are positioned correspondingly. The striker 8 in the mounting base 3 extends into the copper busbar layer 4 and can move towards the upper surface of the copper busbar 5.

[0047] A copper busbar 5 runs horizontally through the copper busbar layer 4. Both ends of the copper busbar 5 extend out of the copper busbar layer 4. Both ends of the copper busbar 5 are connected in series with the circuit that needs to be protected. The copper busbar 5 is located below the striker 8. A pre-break groove is provided at the position of the copper busbar 5 corresponding to the striker 8. A chamber corresponding to the striker 8 is provided in the lower cover 6. An arc extinguishing device is provided in the chamber.

[0048] The firing pin 8 includes a movable body. The outer surface of the movable body is in contact with the hollow inner wall of the mounting base 3. The movable body is located directly below the gas generator 7. A cutter is fixedly installed at the bottom of the movable body. The bottom of the cutter is directly opposite the pre-cut groove of the copper busbar 5.

[0049] This embodiment represents only a preferred implementation of the low-voltage excitation circuit breaker of this utility model. Any low-voltage excitation circuit breaker designed with similar technical features to this utility model will fall within the protection scope of the low-voltage excitation circuit breaker of this utility model.

[0050] Example 6

[0051] This embodiment provides a low-voltage excitation-type circuit breaker, which is connected to the circuit to be protected. It includes a copper busbar layer 4, with a mounting base 3 and a lower cover 6 fixed above and below the copper busbar layer 4, respectively. A gas generator 7 is fixedly installed on the mounting base 3, and a striker 8 is installed directly below the gas generator 7. The striker 8 is located in the mounting base 3. Both the mounting base 3 and the copper busbar layer 4 are hollow structures, and the hollow structures of the mounting base 3 and the copper busbar layer 4 are positioned correspondingly. The striker 8 in the mounting base 3 extends into the copper busbar layer 4 and can move towards the upper surface of the copper busbar 5.

[0052] A copper busbar 5 runs horizontally through the copper busbar layer 4. Both ends of the copper busbar 5 extend out of the copper busbar layer 4. Both ends of the copper busbar 5 are connected in series with the circuit that needs to be protected. The copper busbar 5 is located below the striker 8. A pre-break groove is provided at the position of the copper busbar 5 corresponding to the striker 8. A chamber corresponding to the striker 8 is provided in the lower cover 6. An arc extinguishing device is provided in the chamber.

[0053] The firing pin 8 includes a movable body. The outer surface of the movable body is in contact with the hollow inner wall of the mounting base 3. The movable body is located directly below the gas generator 7. A cutter is fixedly installed at the bottom of the movable body. The bottom of the cutter is directly opposite the pre-break groove of the copper busbar 5, so that the firing pin 8 can break the copper busbar 5 at the pre-break groove and move in a predetermined manner.

[0054] The lower cover 6 seals the bottom of the copper busbar layer 4, and the lower cover 6 extends towards the copper busbar 5 with an integral narrow slit 9. The integral narrow slit 9 is located on the central axis of the chamber of the lower cover 6, and the top of the integral narrow slit 9 is fixed to the middle position of the pre-break groove of the copper busbar 5.

[0055] The cutting blade of the firing pin 8 has a guide groove from the bottom towards the moving body, and the integral narrow slit 9 corresponds to and matches the guide groove.

[0056] This embodiment represents only a preferred implementation of the low-voltage excitation circuit breaker of this utility model. Any low-voltage excitation circuit breaker designed with similar technical features to this utility model will fall within the protection scope of the low-voltage excitation circuit breaker of this utility model.

[0057] Example 7

[0058] This embodiment provides a low-voltage excitation circuit breaker, which is connected to the circuit requiring protection, such as... Figure 1-2 As shown, it includes a copper busbar layer 4, with a mounting base 3 and a lower cover 6 fixed above and below the copper busbar layer 4, respectively. The outer surface of the mounting base 3 is covered with a metal cover 2, and the outer surface of the metal cover 2 is fixed with a shell 1. A gas generator 7 is fixedly installed on the mounting base 3. The gas generator 7 is a miniature gas generator, and a striker 8 is installed directly below the gas generator 7. The striker 8 is located in the mounting base 3.

[0059] A copper busbar 5 runs horizontally through the copper busbar layer 4. Both ends of the copper busbar 5 extend out of the copper busbar layer 4 and are connected in series with the circuits that need to be protected. The copper busbar 5 is located below the striker 8. A pre-break groove is provided at the position corresponding to the striker 8. The pre-break groove of the copper busbar 5 is thinner than other parts of the copper busbar 5. A chamber corresponding to the striker 8 is provided in the lower cover 6. An arc extinguishing device is provided at the bottom of the chamber. The arc extinguishing device is a metal mesh 10.

[0060] Both the mounting base 3 and the copper busbar layer 4 are hollow structures, and the hollow structures of the mounting base 3 and the copper busbar layer 4 are positioned correspondingly. The striking pin 8 in the mounting base 3 extends into the copper busbar layer 4, and the striking pin 8 can move towards the upper surface of the copper busbar 5.

[0061] The firing pin 8 includes a movable body. The outer surface of the movable body is in contact with the hollow inner wall of the mounting base 3. The movable body is located directly below the gas generator 7. A cutter is fixedly installed at the bottom of the movable body. The bottom of the cutter is directly opposite the pre-cut groove of the copper busbar 5.

[0062] like Figure 3 As shown, the copper busbar layer 4 is provided with two reserved slots 11. The depth of the reserved slots 11 is the distance from the lower surface of the copper busbar 5 to the lower surface of the copper busbar layer 4. The two reserved slots 11 are located at corresponding positions on both sides of the cutter of the firing pin 8.

[0063] The bottom cover 6 seals the bottom of the copper busbar layer 4, and the bottom cover 6 extends towards the copper busbar 5 with an integral narrow slit 9. The integral narrow slit 9 is located on the central axis of the chamber of the bottom cover 6. The top of the integral narrow slit 9 is fixed in the middle position of the pre-cut groove of the copper busbar 5. The cutter of the firing pin 8 has a guide groove from the bottom to the moving body. The integral narrow slit 9 corresponds to and matches the guide groove.

[0064] When a circuit abnormality is detected, the system issues an instruction to generate a 1.2A current. The miniature gas generator 7 detonates within less than 2ms. After detonation, it pushes the striker 8 downward in a straight line to break the copper busbar 5. The copper busbar 5 is broken from the pre-break slot. The contacts at the broken point of the copper busbar 5 are bent to both sides and enter the reserved slot 11 of the copper busbar layer 4. The striker 8 continues to move downward until it reaches the limit position, completely sealing and isolating the contacts into the reserved slot 11. The metal mesh plays an arc-extinguishing role for the electric arc entering the chamber.

[0065] With the above structure, the low-voltage excitation circuit breaker adopts a new power source and a hybrid arc extinguishing method to quickly and efficiently complete power outage and arc extinguishing.

[0066] This embodiment represents only a preferred implementation of the low-voltage excitation circuit breaker of this utility model. Any low-voltage excitation circuit breaker designed with similar technical features to this utility model will fall within the protection scope of the low-voltage excitation circuit breaker of this utility model.

[0067] The main functions of each component of this low-voltage excitation-type circuit breaker are as follows:

[0068] The outer shell 1 serves to protect the internal structure, while the metal cover 2 enhances the overall protective performance.

[0069] Mounting base 3 provides mounting positions for key components such as miniature gas generator 7 and firing pin 8, ensuring their relative positional accuracy.

[0070] Copper busbar layer 4 is used to fix copper busbar 5, which is a conductive component and undertakes the function of current transmission.

[0071] The bottom cover 6 seals the bottom and together with other components, forms a sealed cavity.

[0072] The miniature gas generator 7 is the core component that generates driving force, and the firing pin 8 moves under its action.

[0073] The integrated narrow slit 9 and the lower cover 6 are a whole, which not only serves to extinguish the arc but also guides the downward linear movement of the striker 8. The metal mesh 10 plays the role of extinguishing the arc and preventing the arc from spreading.

[0074] The impact pin 8 is accurately installed through the pre-drilled slot on the mounting base 3, ensuring the accuracy and stability of the impact pin's movement.

[0075] The copper busbar 5 is injection molded into the copper busbar layer 4, and is installed by cooperating with the cylindrical protrusion on the narrow slit 9 of the lower cover 6 through the round hole in the middle of the copper busbar 5, ensuring the reliability of the connection.

[0076] The metal mesh 10 is directly pressed into the lower cover 6, and the components are fixed by bolts and nuts to form a complete low-voltage excitation circuit breaker structure.

[0077] The working principle of this low-voltage excitation-type circuit breaker is as follows:

[0078] like Figure 1 As shown, firstly, the low-pressure excitation signal triggers the micro gas generator 7 to work. The high-pressure gas generated by the micro gas generator 7 quickly pushes the striker 8 downward in a straight line. The cutter of the striker 8 strikes the copper busbar 5 with a certain speed and force, causing the copper busbar 5 to break at the pre-break slot. The contacts formed at the break point of the copper busbar 5 then open to both sides and fall into the reserved slot 11, realizing the circuit disconnection.

[0079] like Figure 2 As shown, the striking pin 8 continues to move downwards to the limit position, at which point an isolation space is formed between the striking pin 8 and the lower cover 6, preventing the electric arc from spreading upwards. Simultaneously, the metal mesh 10 intercepts and cools the electric arc, quickly extinguishing it. Throughout the entire process, all components work closely together to ensure the normal operation and safety of the circuit breaker.

[0080] The above provides a detailed description of a low-voltage excitation circuit breaker provided by this utility model. Specific examples have been used to illustrate the implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the structure and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A low-voltage excitation circuit breaker, connected to the circuit requiring protection, characterized in that, The system includes a copper busbar layer (4), with a mounting base (3) and a lower cover (6) fixed above and below the copper busbar layer (4). A gas generator (7) is fixedly installed on the mounting base (3), and a striker (8) is installed directly below the gas generator (7). The striker (8) is located in the mounting base (3). A copper busbar (5) runs horizontally through the copper busbar layer (4), with both ends of the copper busbar (5) extending out of the copper busbar layer (4). Both ends of the copper busbar (5) are connected in series with the circuit to be protected. The copper busbar (5) is located below the striker (8). A pre-break groove is provided at the position corresponding to the striker (8) on the copper busbar (5). A chamber corresponding to the striker (8) is provided in the lower cover (6), and an arc extinguishing device is provided in the chamber.

2. The low-voltage excitation circuit breaker according to claim 1, characterized in that, The mounting base (3) and the copper busbar layer (4) are both hollow structures, and the hollow structures of the mounting base (3) and the copper busbar layer (4) are in corresponding positions. The striker (8) in the mounting base (3) extends into the copper busbar layer (4), and the striker (8) can move to the upper surface of the copper busbar (5).

3. The low-voltage excitation circuit breaker according to claim 1, characterized in that, The gas generator (7) is a miniature gas generator.

4. The low-voltage excitation circuit breaker according to claim 1, characterized in that, The mounting base (3) is covered with a metal cover (2) on its outer surface.

5. The low-voltage excitation circuit breaker according to claim 4, characterized in that, The outer surface of the metal cover (2) is fixed with a shell (1).

6. The low-voltage excitation circuit breaker according to claim 2, characterized in that, The striker (8) includes a movable body. The outer surface of the movable body is in contact with the hollow inner wall of the mounting base (3). The movable body is located directly below the gas generator (7). A cutter is fixedly installed at the bottom of the movable body. The bottom of the cutter is directly opposite the pre-cut groove of the copper busbar (5).

7. The low-voltage excitation circuit breaker according to claim 6, characterized in that, The lower cover (6) closes the bottom of the copper busbar layer (4), and the lower cover (6) extends towards the copper busbar (5) with an integral narrow slit (9). The integral narrow slit (9) is located on the central axis of the lower cover (6) chamber. The top of the integral narrow slit (9) is fixed at the middle position of the pre-cut groove of the copper busbar (5). The cutter of the striker (8) has a guide groove from the bottom end towards the moving body. The integral narrow slit (9) corresponds to and matches the guide groove.

8. The low-voltage excitation circuit breaker according to claim 1, characterized in that, The pre-cut groove of the copper busbar (5) is thinner than other parts of the copper busbar (5).

9. The low-voltage excitation circuit breaker according to claim 1, characterized in that, The arc-extinguishing device (10) is located at the bottom of the lower cover (6) chamber and is a metal mesh (10).

10. The low-voltage excitation circuit breaker according to claim 1, characterized in that, The copper busbar layer (4) is provided with two reserved slots (11). The depth of the reserved slots (11) is the distance from the lower surface of the copper busbar (5) to the lower surface of the copper busbar layer (4). The two reserved slots (11) are respectively located on the corresponding positions on both sides of the cutter of the striker (8).

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