A circuit breaker

Abstract

This application provides a circuit breaker, relating to the field of switch technology, which can increase the electrical clearance and creepage distance between the circuit board and other components, while reducing the possibility of metal particles or carbon dust generated during the circuit breaker's breaking process contacting the circuit board, thus preventing various physical and chemical corrosion phenomena and extending the service life of the circuit breaker. The circuit breaker includes a base, a middle cover, a protective cover, and a first circuit board. The base has a first open end and a first closed end disposed opposite to each other, forming a first receiving cavity with one end open. The middle cover is disposed at the first open end. The protective cover has a second open end and a second closed end disposed opposite to each other, forming a second receiving cavity with one end open. The protective cover is disposed within the first receiving cavity, and the second open end is connected to the first closed end. The first circuit board is disposed within the second receiving cavity.

Description

Technical Field

[0001] This application relates to the field of switch technology, specifically to a circuit breaker. Background Technology

[0002] Circuit breakers are important electrical protection devices for circuits. As circuit breakers are developed towards miniaturization, the design dimensions of the components inside the circuit breaker are limited. While meeting the various control functions of the circuit breaker, dielectric testing of the internal components is required, ensuring sufficient electrical clearances and creepage distances between live parts, such as between circuit boards and other components.

[0003] At the same time, when an overload or short circuit occurs in the circuit where the circuit breaker is located, the circuit breaker can disconnect the circuit to ensure electrical safety.

[0004] During the circuit breaker's tripping process, a large number of metal particles and carbon powder are generated. When these metal particles or carbon powder come into contact with the circuit board, they can trigger various physical and chemical corrosion phenomena, leading to a decline in circuit performance or even complete failure, thus shortening the circuit breaker's service life.

[0005] Therefore, there is an urgent need to propose a circuit breaker to solve the problems existing in the current technology. Utility Model Content

[0006] This application provides a circuit breaker that can increase the electrical clearance and creepage distance between the circuit board and other components, while reducing the possibility of metal particles or carbon powder generated during the circuit breaker's breaking process coming into contact with the circuit board, so as to avoid various physical and chemical corrosion phenomena and extend the service life of the circuit breaker.

[0007] To achieve the above objectives, this application provides a circuit breaker, including a base, a middle cover, a protective cover, and a first circuit board. The base has a first open end and a first closed end disposed opposite to each other, forming a first receiving cavity with one end open. The middle cover is disposed at the first open end. The protective cover has a second open end and a second closed end disposed opposite to each other, forming a second receiving cavity with one end open. The protective cover is disposed within the first receiving cavity, and the second open end is connected to the first closed end. The first circuit board is disposed within the second receiving cavity.

[0008] When the above technical solution is adopted, the protective cover is disposed in the first receiving cavity, and the second open end is connected to the first closed end. The first closed end can close the second receiving cavity to form a protective space. The first circuit board is disposed in the second receiving cavity.

[0009] In this case, the protective cover can isolate the first circuit board from other components of the circuit breaker, thereby increasing the electrical clearance and creepage distance between the first circuit board and other components, and improving insulation reliability and safety.

[0010] Furthermore, the protective cover acts as a barrier. When an overload or short circuit occurs in the circuit containing the circuit breaker, the metal particles and carbon dust generated during the circuit breaker's tripping process are blocked outside the second receiving cavity by the protective cover, preventing them from entering. This reduces the possibility of the first circuit board located inside the second receiving cavity coming into contact with metal particles or carbon dust, thus avoiding various physical and chemical corrosion phenomena and extending the service life of the circuit breaker.

[0011] In one possible implementation, the second open end is provided with one of a first protrusion and a first limiting groove that cooperate with each other, and the first closed end is provided with the other of a first protrusion and a first limiting groove.

[0012] When the above technical solution is adopted, the first protrusion and the first limiting groove are engaged to ensure that the relative positions of the protective cover and the base are fixed and to prevent misalignment during assembly. The engagement of the first protrusion and the first limiting groove allows the assembly of the protective cover and the base to be completed without additional tools. Compared with fixing with screws or welding, this method can be completed in one step, reducing the number of parts and steps, simplifying the structure, and saving time and costs.

[0013] In one possible implementation, the second closed end is provided with a threading hole, and the second closed end abuts against the middle cover.

[0014] When the above technical solution is adopted, when the protective cover is connected to the base, the second closed end abuts against the middle cover, the second open end abuts against the first closed end, and the first protrusion cooperates with the first limiting groove. In this case, not only can the firmness of the protective cover on the base be enhanced, but the protective effect of the protective cover on the first circuit board can also be improved, further enhancing the structural strength of the circuit breaker.

[0015] The second closed end is provided with a wire-through hole to facilitate electrical connection between the first circuit board and other components located outside the protective cover. The second closed end abuts against the middle cover, and the gap between the second closed end and the middle cover is small or non-existent to prevent metal particles and carbon powder from entering the second receiving cavity through the wire-through hole. In this way, while ensuring the connection of the first circuit board to the circuit, the possibility of the first circuit board located in the second receiving cavity coming into contact with metal particles or carbon powder is minimized, avoiding various physical and chemical corrosion phenomena and extending the service life of the circuit breaker.

[0016] In addition, the protective cover is detachably connected to the base and the middle cover, and can be disassembled under certain conditions to repair or replace the base, protective cover and middle cover separately, which can reduce maintenance costs.

[0017] In one possible implementation, a second protrusion is provided on the side of the second closed end away from the second open end, and the second protrusion surrounds the outer periphery of the wire hole. A second limiting groove is provided on the middle cover to mate with the second protrusion, and the outer wall of the second protrusion is in close contact with the groove wall of the second limiting groove.

[0018] When the above technical solution is adopted, on the one hand, the outer wall of the second protrusion fits tightly against the wall of the second limiting groove, which can prevent metal particles and carbon powder from entering the second receiving cavity through the wire hole. On the other hand, the second protrusion and the second limiting groove cooperate to limit the protective cover, which can improve the firmness of the protective cover on the base.

[0019] In addition to the above, a second limiting groove is provided on the middle cover to cooperate with the second protrusion, which is conducive to air circulation, enhances the convection between the air outside the protective cover and the air inside the second receiving cavity, facilitates the timely dissipation of heat generated by the first circuit board, avoids local overheating of the first circuit board, and improves the safety performance of the circuit breaker.

[0020] In one possible implementation, a limit group is provided on the inner wall of the protective cover. The limit group includes two opposing third protrusions, and a limit space is formed between the two third protrusions. One side of the first circuit board is disposed within the limit space.

[0021] When using the above technical solution, during specific installation, the first circuit board only needs to be inserted into the limiting space to achieve the installation of the first circuit board. There is no need to use bolts, rivets, etc., which can be done in one step, simplifying the structure and reducing assembly steps.

[0022] Meanwhile, the first circuit board is inserted into the limiting space and can be disassembled under certain conditions to repair or replace the first circuit board and the protective cover separately, which can reduce maintenance costs.

[0023] In one possible implementation, the third protrusion extends along the direction from the second open end to the second closed end. A guide surface is provided at the end of the third protrusion near the second open end, and the guide surface is inclined toward the limiting space in the direction from the second open end to the second closed end.

[0024] When the above technical solution is adopted, the side of the limiting space near the second opening is larger. In this case, during the process of inserting the first circuit board into the limiting space, the guide surface can, on the one hand, guide the first circuit board to be inserted between the two third protrusions, facilitating the installation of the first circuit board. On the other hand, it prevents the end of the third protrusion near the second opening from scratching the first circuit board, thus avoiding damage to the first circuit board.

[0025] In one possible implementation, the circuit breaker further includes a second circuit board disposed on the side of the middle cover away from the base.

[0026] When the above technical solution is adopted, the circuit breaker provided in this application includes two circuit boards, namely the first circuit board and the second circuit board, which increases the area of ​​the circuit board. This not only ensures the area of ​​the circuit board and provides more installation space, but also meets the performance requirements such as the increased current carrying capacity of the circuit breaker. Moreover, the increased area of ​​the circuit board increases the heat dissipation area and the heat exchange area with the outside of the circuit board, which is beneficial to meeting the heat dissipation requirements of the circuit board.

[0027] In addition, the first circuit board and the second circuit board are located on both sides of the middle cover. The dispersed layout of the first circuit board and the second circuit board helps to make reasonable use of space and allows for separate heat dissipation paths to reduce the temperature rise of the first circuit board and the second circuit board.

[0028] In one possible implementation, the middle cover is provided with one of a fourth protrusion and a recess that cooperate with each other, and the second circuit board is provided with the other of a fourth protrusion and a recess.

[0029] When the above technical solution is adopted, the fourth protrusion and the recessed portion cooperate to ensure that the relative position of the middle cover and the second circuit board is fixed, preventing misalignment during assembly. The cooperation of the fourth protrusion and the recessed portion can improve the stability of the second circuit board mounted on the middle cover.

[0030] In one possible implementation, the circuit breaker further includes a protective plate disposed within the middle cover, and a second circuit board located between the protective plate and the middle cover.

[0031] When the above technical solution is adopted, the protective plate and the middle cover can provide a protective space for the second circuit board, isolate the second circuit board from other components of the circuit breaker, increase the electrical clearance and creepage distance between the second circuit board and other components, and improve insulation reliability and safety.

[0032] Furthermore, the protective plate and the middle cover have a barrier function. When an abnormal situation such as overload or short circuit occurs in the circuit where the circuit breaker is located, the metal particles and carbon powder generated during the circuit breaker's disconnection process will be blocked by the protective plate and the middle cover. This reduces the possibility of the second circuit board coming into contact with metal particles or carbon powder, thus preventing various physical and chemical corrosion phenomena and extending the service life of the circuit breaker.

[0033] In one possible implementation, the protective plate is provided with one of a mutually cooperating buckle and a slot, and the middle cover is provided with the other of a buckle and a slot.

[0034] When the above technical solution is adopted, the connection between the protective plate and the middle cover is strengthened, ensuring the protective effect of the protective plate on the second circuit board. When the buckle and the slot are engaged, the protective plate and the middle cover are snapped together in one step, which can reduce the number of parts and steps, simplify the structure, and save time and cost. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the circuit breaker provided in an embodiment of this application.

[0036] Figure 2 An exploded view of a circuit breaker provided in an embodiment of this application.

[0037] Figure 3 This is a top view of a partial circuit breaker provided in an embodiment of this application.

[0038] Figure 4 for Figure 3 Enlarged diagram of point A in the middle.

[0039] Figure 5 This is a top view of a circuit breaker provided in an embodiment of this application.

[0040] Figure 6 for Figure 5 A cross-sectional view of BB.

[0041] Figure 7 for Figure 5 A cross-sectional view of CC.

[0042] Figure 8 Schematic diagram of the structure of the protective cover provided in the embodiments of this application Figure 1 .

[0043] Figure 9 Schematic diagram of the structure of the protective cover provided in the embodiments of this application Figure 2 .

[0044] Figure 10 This is a partial structural diagram of the base provided in an embodiment of this application.

[0045] Figure 11 This is a schematic diagram of the structure of the cover provided in an embodiment of this application.

[0046] Figure 12 Schematic diagram of the structure of the protective plate provided in the embodiments of this application Figure 1 .

[0047] Figure 13 Schematic diagram of the structure of the protective plate provided in the embodiments of this application Figure 2 .

[0048] Explanation of reference numerals in the attached figures:

[0049] 1-Base, 11-First limiting groove, 2-Middle cover, 21-Second limiting groove, 22-Recessed part, 23-Snap fastener, 3-Protective cover

[0050] 31-First protrusion, 32-Threading hole, 33-Second protrusion, 34-Third protrusion, 341-Guide surface,

[0051] 4-Second circuit board, 5-Protective board, 51-Card slot, 52-Wire routing channel. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0054] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0056] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0057] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0058] Please refer to Figure 1 and Figure 2 As shown in the figure, this application embodiment provides a circuit breaker, which includes a base 1, a middle cover 2, a protective cover 3, and a first circuit board.

[0059] The base 1 has a first open end and a first closed end arranged opposite to each other, so that the base 1 forms a first receiving cavity with one end open. The structure and dimensions of the base 1 are not specifically limited here, nor are the structure and dimensions of the first receiving cavity.

[0060] The middle cover 2 is located at the first opening end and can be placed on the base 1. In practice, the middle cover 2 can be connected to the base 1 by welding, snap-fitting, riveting, or screw connection. Of course, this is just an example and is not intended to be a specific limitation.

[0061] In a specific implementation, the circuit breaker provided in this application embodiment also includes a top cover, which is disposed at the end of the middle cover 2 away from the base 1. The connection method between the top cover and the middle cover 2 is not specifically limited here. Exemplarily, the middle cover 2 and the top cover can be connected together by welding, snap-fitting, riveting, or screw connection.

[0062] At this point, the base 1, the middle cover 2, and the top cover form the circuit breaker housing. The housing can be made of plastic, but is not limited to this; the specific material depends on the actual situation. The housing structure can be a cuboid structure, and the housing has accommodating space. In fact, the first circuit board and the protective cover 3 are both housed inside the housing.

[0063] Thus, the housing can accommodate and enclose the first circuit board and protective cover 3, providing a stable space for the components such as the first circuit board and protective cover 3 installed within the housing, ensuring their normal operation without external interference. Simultaneously, the housing provides positioning and support for the first circuit board and protective cover 3, preventing displacement or damage to the components installed within the housing during operation. The housing can also withstand a certain amount of external pressure, protecting the first circuit board and protective cover 3 from damage. Furthermore, the housing provides protection, preventing moisture, dust, dirt, and other impurities from entering the housing, thereby avoiding corrosion or damage to the components installed inside.

[0064] The protective cover 3 has a second open end and a second closed end disposed opposite to each other, for forming a second receiving cavity with one end open. The structure and dimensions of the protective cover 3 are not specifically limited here, nor are the structure and dimensions of the second receiving cavity specifically limited here.

[0065] The protective cover 3 is made of an insulating material. For example, the material of the protective cover 3 can be plastic, but it is not limited to this. The material of the protective cover 3 can be the same as or different from that of the shell.

[0066] The protective cover 3 is disposed within the first receiving cavity, and the second open end is connected to the first closed end, that is, the protective cover 3 is connected to the base 1. In specific implementation, the connection method between the protective cover 3 and the base 1 is not specifically limited here.

[0067] For example, the protective cover 3 can be connected to the base 1 by riveting, screwing or welding, but of course, it is not limited to this.

[0068] The first circuit board is disposed within the second receiving cavity. In specific implementations, the first circuit board can be disposed within the second receiving cavity by means of snap-fitting, soldering, or other methods. Of course, this is only an example and is not intended to be a specific limitation.

[0069] The second open end is connected to the first closed end, which can seal the second receiving cavity to form a protective space. The first circuit board is disposed within the second receiving cavity, that is, the first circuit board is located within the protective space.

[0070] In this case, the protective cover 3 can isolate the first circuit board from other components of the circuit breaker, thereby increasing the electrical clearance and creepage distance between the first circuit board and other components, and improving insulation reliability and safety.

[0071] Furthermore, the protective cover 3 serves as a barrier. When an overload or short circuit occurs in the circuit containing the circuit breaker, the metal particles and carbon dust generated during the circuit breaker's tripping process are blocked outside the second receiving cavity by the protective cover 3, preventing them from entering the second receiving cavity. This reduces the possibility of the first circuit board located inside the second receiving cavity coming into contact with metal particles or carbon dust, thus avoiding various physical and chemical corrosion phenomena and extending the service life of the circuit breaker.

[0072] It should be noted that the direction from the first open end to the first closed end can be parallel to the direction from the second open end to the second closed end.

[0073] In one possible implementation, please combine Figure 3 , Figure 4 , Figures 8 to 10 As shown, the second open end is provided with one of a first protrusion 31 and a first limiting groove 11 that cooperate with each other, and the first closed end is provided with the other of a first protrusion 31 and a first limiting groove 11.

[0074] When the first protrusion 31 engages with the first limiting groove 11, it ensures that the relative positions of the protective cover 3 and the base 1 are fixed, preventing misalignment during assembly. The engagement of the first protrusion 31 with the first limiting groove 11 allows for the assembly of the protective cover 3 and the base 1 without additional tools. Compared to using screws or welding, this method can be completed in one step, reducing the number of parts and steps, simplifying the structure, and saving time and costs.

[0075] In practice, the first protrusion 31 can be disposed on the protective cover 3, and the first limiting groove 11 can be disposed on the base 1. Alternatively, the first protrusion 31 can be disposed on the base 1, and the first limiting groove 11 can be disposed on the protective cover 3.

[0076] In the embodiments provided in this application, such as Figures 8 to 10 As shown, the protective cover 3 has a first protrusion 31 on its side and a first limiting groove 11 on its base 1.

[0077] The number of first protrusions 31 can be two, to enhance the stability of the connection between the protective cover 3 and the base 1. Correspondingly, the number of first limiting grooves 11 is also two.

[0078] In practice, the first protrusion 31 can be installed on the protective cover 3 by welding, snap-fitting, or screw connection. Of course, the first protrusion 31 can also be integrally formed with the protective cover 3.

[0079] A first limiting groove 11 can be formed on the base 1. In the embodiments provided in this application, such as... Figure 10As shown, a protrusion is provided on the cavity wall of the base 1, and a first limiting groove 11 is formed between the protrusion and the cavity wall.

[0080] In actual operation, the length of the first protrusion 31 can extend along the direction from the first open end to the first closed end. Thus, during actual installation, the first protrusion 31 can be aligned and matched with the first limiting groove 11. Then, along the direction from the first open end to the first closed end, the first closed ends of the protective cover 3 and the base 1 are brought closer together, so that the first protrusion 31 extends into the first limiting groove 11, completing the installation of the protective cover 3 and the base 1.

[0081] To reduce the possibility of the protective cover 3 shaking when installed in the first receiving cavity, in the embodiment provided in this application, the second closed end abuts against the middle cover 2.

[0082] Thus, it can be understood that when the protective cover 3 is connected to the base 1, the second closed end abuts against the middle cover 2, the second open end abuts against the first closed end, and the first protrusion 31 cooperates with the first limiting groove 11. In this case, not only can the firmness of the protective cover 3 on the base 1 be enhanced, but the protective effect of the protective cover 3 on the first circuit board can also be improved, further enhancing the structural strength of the circuit breaker.

[0083] In addition, the second closed end is provided with a wire hole 32, such as Figure 9 As shown, this facilitates electrical connection between the first circuit board and other components disposed outside the protective cover 3 and located inside the housing.

[0084] The second closed end abuts against the middle cover 2, and the gap between the second closed end and the middle cover 2 is small or non-existent to prevent metal particles and carbon powder from entering the second receiving cavity through the wire hole 32. In this way, while ensuring the connection between the first circuit board and the circuit, the possibility of the first circuit board located in the second receiving cavity coming into contact with metal particles or carbon powder is minimized, so as to avoid various physical and chemical corrosion phenomena and extend the service life of the circuit breaker.

[0085] In addition, the protective cover 3 is detachably connected to the base 1 and the middle cover 2, and can be disassembled under certain conditions to repair or replace the base 1, the protective cover 3, and the middle cover 2 respectively, which can reduce maintenance costs.

[0086] Of course, in specific implementation, a wire hole 32 can also be opened on the side of the protective cover 3, which is not specifically limited here.

[0087] The structure and dimensions of the thread hole 32 are not specified here; the specific dimensions shall be determined based on the actual situation.

[0088] In some embodiments, a second protrusion 33 is provided on the side of the second closed end away from the second open end, and the second protrusion 33 surrounds the outer periphery of the wire hole 32, in conjunction with... Figure 8 and Figure 9 As shown. The middle cover 2 has a second limiting groove 21 that mates with the second protrusion 33. The outer wall of the second protrusion 33 is tightly fitted with the groove wall of the second limiting groove 21. Please refer to... Figure 5 , Figure 6 , Figure 8 and Figure 9 As shown.

[0089] Thus, on the one hand, the outer wall of the second protrusion 33 fits tightly against the groove wall of the second limiting groove 21, preventing metal particles and carbon powder from entering the second receiving cavity through the wire hole 32. On the other hand, the cooperation between the second protrusion 33 and the second limiting groove 21 can limit the protective cover 3, thereby improving the stability of the protective cover 3 on the base 1.

[0090] In addition to the above, the middle cover 2 is provided with a second limiting groove 21 that cooperates with the second protrusion 33, which is conducive to air circulation, enhances the convection between the air outside the protective cover 3 and the air inside the second accommodating cavity, facilitates the timely dissipation of heat generated by the first circuit board, avoids local overheating of the first circuit board, and improves the safety performance of the circuit breaker.

[0091] As an optional approach, such as Figure 9 As shown, a limit group is provided on the inner wall of the protective cover 3. The limit group includes two oppositely arranged third protrusions 34, and a limit space is formed between the two third protrusions 34. One side of the first circuit board is disposed in the limit space.

[0092] Thus, during installation, the first circuit board can be installed simply by inserting it into the limiting space, without the need for bolts, rivets, etc., which can be done in one step, simplifying the structure and reducing assembly steps.

[0093] Meanwhile, the first circuit board is inserted into the limiting space and can be disassembled under certain conditions to repair or replace the first circuit board and the protective cover 3 respectively, which can reduce maintenance costs.

[0094] To enhance the stability of the first circuit board within the second receiving cavity, limiting groups can be provided on the two opposing cavity walls of the protective cover 3. Specifically, two opposing limiting groups can be provided on the cavity walls of the protective cover 3, corresponding to the opposite sides of the first circuit board, with each side of the first circuit board inserted into its corresponding limiting space. Furthermore, in practice, an interference fit can be used between the first circuit board and the limiting groups to further enhance the robustness of the first circuit board within the second receiving cavity.

[0095] In specific implementation, the third protrusion 34 can be disposed on the cavity wall of the protective cover 3 by means of welding or snap-fitting. The protective cover 3 provided in this application embodiment can be an integral structure, that is, when the protective cover 3 is processed, the first protrusion 31, the second protrusion 33 and the third protrusion 34 are formed together.

[0096] As an example, such as Figure 9 As shown, the third protrusion 34 extends in the direction from the second open end to the second closed end. A guide surface 341 is provided at one end of the third protrusion 34 near the second open end, and the guide surface 341 is inclined toward the limiting space in the direction from the second open end to the second closed end.

[0097] This results in a larger space on the side of the limiting space near the second opening. In this case, during the insertion of the first circuit board into the limiting space, the guide surface 341 serves two purposes: firstly, it guides the first circuit board to be inserted between the two third protrusions 34, facilitating the installation of the first circuit board; secondly, it prevents the end of the third protrusion 34 near the second opening from scratching the first circuit board, thus avoiding damage to the first circuit board.

[0098] In practice, a guide surface 341 can be provided on each of the third protrusions 34, but no specific limitation is made here.

[0099] In one possible implementation, the circuit breaker further includes a second circuit board 4, which is disposed on the side of the middle cover 2 away from the base 1.

[0100] Thus, the circuit breaker provided in this application embodiment includes two circuit boards, namely the first circuit board and the second circuit board 4, which increases the area of ​​the circuit boards. This not only ensures the area of ​​the circuit boards and provides more installation space to meet the performance requirements such as increased current carrying capacity of the circuit breaker, but also increases the heat dissipation area and the heat exchange area with the outside of the circuit board, which is beneficial to meeting the heat dissipation requirements of the circuit board.

[0101] In addition, the first circuit board and the second circuit board 4 are located on both sides of the middle cover 2. The first circuit board and the second circuit board 4 are distributed in a way that helps to make reasonable use of space and allows for separate heat dissipation paths to reduce the temperature rise of the first circuit board and the second circuit board 4.

[0102] As a possible approach, the middle cover 2 is provided with one of a fourth protrusion and a recess 22 that cooperate with each other, and the second circuit board 4 is provided with the other of the fourth protrusion and recess 22.

[0103] When the fourth protrusion and the recess 22 mate, the relative positions of the middle cover 2 and the second circuit board 4 are fixed, preventing misalignment during assembly. The mate of the fourth protrusion and the recess 22 enhances the stability of the second circuit board 4 mounted on the middle cover 2.

[0104] In a specific implementation, the fourth protrusion can be provided on the middle cover 2, and correspondingly, the recessed portion 22 can be provided on the second circuit board 4. Alternatively, the fourth protrusion can be provided on the second circuit board 4, and correspondingly, the recessed portion 22 can be provided on the middle cover 2.

[0105] In the embodiments provided in this application, such as Figure 11 As shown, the recessed portion 22 is provided on the middle cover 2.

[0106] There can be multiple fourth protrusions, and correspondingly, there can be multiple recesses 22, with each recess 22 corresponding to a fourth protrusion.

[0107] The second circuit board 4 can be fixed on the middle cover 2 by means of welding, snap-fitting or riveting. Of course, this is just an example and is not a specific limitation.

[0108] In one possible implementation, the circuit breaker provided in this application embodiment further includes a protective plate 5, such as... Figures 1 to 3 As shown, the protective plate 5 is disposed on the middle cover 2, and the second circuit board 4 is located between the protective plate 5 and the middle cover 2.

[0109] Thus, the protective plate 5 and the middle cover 2 can provide a protective space for the second circuit board 4, separating the second circuit board 4 from other components of the circuit breaker, thereby increasing the electrical clearance and creepage distance between the second circuit board 4 and other components, and improving insulation reliability and safety.

[0110] Furthermore, the protective plate 5 and the middle cover 2 have a barrier function. When an overload or short circuit occurs in the circuit where the circuit breaker is located, the metal particles and carbon powder generated during the circuit breaker's disconnection process will be blocked by the protective plate 5 and the middle cover 2. This reduces the possibility of the second circuit board 4 coming into contact with metal particles or carbon powder, thus preventing various physical and chemical corrosion phenomena and extending the service life of the circuit breaker.

[0111] The protective plate 5 can be fixed to the middle cover 2 by welding, snap-fitting or riveting. Of course, this is just an example and is not a specific limitation.

[0112] In the embodiments provided in this application, please refer to Figure 5 and Figure 7 As shown, the protective plate 5 is connected to the middle cover 2 using screws.

[0113] In addition to the protective plate 5 and the middle cover 2 being connected by screws, the protective plate 5 is also provided with one of the mutually cooperating slots 51 and buckles 23, and the middle cover 2 is provided with the other of the slots 51 and buckles 23.

[0114] This enhances the connection between the protective plate 5 and the middle cover 2, ensuring the protective plate 5's protective function for the second circuit board 4. When the slot 51 and the buckle 23 engage, the protective plate 5 and the middle cover 2 are snapped together in one step, reducing the number of parts and steps, simplifying the structure, and saving time and cost.

[0115] In practice, the slot 51 can be placed on the middle cover 2, and the buckle 23 can be placed on the second circuit board 4. Alternatively, the slot 51 can be placed on the second circuit board 4, and the buckle 23 can be placed on the middle cover 2.

[0116] In the embodiments provided in this application, such as Figure 12 and Figure 13 As shown, the buckle 23 is set on the middle cover 2.

[0117] The middle cover 2 can be a one-piece structure, or the buckle 23 can be welded onto the middle cover 2. Of course, it is not limited to this.

[0118] In practice, multiple buckles 23 can be set on the middle cover 2, and multiple slots 51 can be set on the protective plate 5 to enhance the firmness of the connection between the protective plate 5 and the middle cover 2.

[0119] In addition, an accessory slot is provided on the middle cover 2 to facilitate the installation and positioning of accessories. The protective plate 5 is provided to prevent operators from accidentally touching the second circuit board 4 during subsequent accessory installation.

[0120] Furthermore, such as Figure 13 As shown, a wiring trough 52 is also provided on the protective plate 5 to facilitate wiring and reduce the possibility of messy wires inside the circuit breaker.

[0121] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection. A physical connection can be a fixed connection, such as a connection secured by fasteners, such as a connection secured by screws, bolts, or other fasteners; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

Claims

1. A circuit breaker characterized by, include: The base has a first open end and a first closed end disposed opposite to each other, for forming a first receiving cavity with one end open; The middle cover is disposed at the first opening end; A protective cover has a second open end and a second closed end disposed opposite to each other, for forming a second receiving cavity with one end open; The protective cover is disposed within the first receiving cavity; The second open end is connected to the first closed end; The first circuit board is disposed within the second receiving cavity.

2. The circuit breaker of claim 1, wherein, The second open end is provided with one of a first protrusion and a first limiting groove that cooperate with each other, and the first closed end is provided with the other of the first protrusion and the first limiting groove.

3. The circuit breaker according to claim 1, characterized in that, The second closed end is provided with a threading hole; the second closed end abuts against the middle cover.

4. The circuit breaker according to claim 3, characterized in that, A second protrusion is provided on the side of the second closed end away from the second open end, and the second protrusion surrounds the outer periphery of the thread hole; a second limiting groove is provided on the middle cover to cooperate with the second protrusion, and the outer wall of the second protrusion is in close contact with the groove wall of the second limiting groove.

5. The circuit breaker according to claim 1, characterized in that, The inner wall of the protective cover is provided with a limiting group, which includes two oppositely arranged third protrusions, forming a limiting space between the two third protrusions, and one side of the first circuit board is disposed within the limiting space.

6. The circuit breaker according to claim 5, characterized in that, The third protrusion extends along the direction from the second open end to the second closed end; a guide surface is provided at one end of the third protrusion near the second open end, and the guide surface is inclined toward the limiting space from the second open end to the second closed end.

7. The circuit breaker according to any one of claims 1-6, characterized in that, The circuit breaker also includes a second circuit board disposed on the side of the middle cover away from the base.

8. The circuit breaker according to claim 7, characterized in that, The middle cover is provided with one of a fourth protrusion and a recess that cooperate with each other, and the second circuit board is provided with the other of the fourth protrusion and the recess.

9. The circuit breaker according to claim 7, characterized in that, The circuit breaker also includes a protective plate disposed on the middle cover, and the second circuit board is located between the protective plate and the middle cover.

10. The circuit breaker according to claim 9, characterized in that, The protective plate is provided with one of a buckle and a slot that cooperate with each other, and the middle cover is provided with the other of the buckle and slot.

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