A circuit breaker and low voltage electrical apparatus

Abstract

The utility model provides a kind of circuit breaker and low-voltage electrical equipment, it is related to technical field.Circuit breaker includes base, operating mechanism, connecting rod, transmission assembly and contact assembly, base is provided with first installation cavity, second installation cavity, installation part, first isolation part and second isolation part, installation part and second installation cavity are set back, operating mechanism is set in installation part;Connecting rod one end extends to installation part and is connected with operating mechanism, the other end is inserted into first installation cavity, transmission assembly is set in first installation cavity and is connected with connecting rod transmission, contact assembly is set in second installation cavity and is connected with transmission assembly transmission, by first isolation part in connecting rod close to operating mechanism side, it can play the electric potential isolation effect between connecting rod and external environment, prevent operating mechanism side to be influenced by current;Second isolation part is located in connecting rod side away from operating mechanism, further isolates the conduction path between connecting rod and main circuit current, to improve insulating property and security.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and more specifically, to a circuit breaker and low-voltage electrical equipment. Background Technology

[0002] As a critical protective device in power systems, circuit breakers primarily function to quickly disconnect circuits upon detecting abnormal conditions such as overloads or short circuits, preventing damage to electrical equipment and ensuring personnel safety. Circuit breakers typically rely on an operating mechanism that moves a linkage; the movement of the linkage controls the closing and opening of the circuit between the moving and stationary contacts, ensuring circuit continuity control.

[0003] However, existing circuit breakers lack effective internal insulation, making them susceptible to risks such as arc crossing, phase-to-phase short circuits, or short circuits to ground. This not only threatens the safety of the circuit breaker itself but may also trigger wider power system failures. This risk is particularly pronounced in compact designs where components are close together. Furthermore, without proper insulation, the circuit breaker's insulation performance may deteriorate over long-term operation due to environmental factors (such as moisture and dust), increasing the likelihood of leakage and reducing the equipment's operational stability and reliability. Utility Model Content

[0004] This utility model provides a circuit breaker and low-voltage electrical equipment, which not only achieves a compact spatial layout, but also significantly improves the insulation performance and operational safety of the circuit breaker.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] In a first aspect, this utility model provides a circuit breaker, comprising:

[0007] The base has a first mounting cavity, a second mounting cavity, a mounting part, a first isolation part, and a second isolation part. The first isolation part is used to enclose the first mounting cavity, and the mounting part and the second mounting cavity are disposed opposite to each other.

[0008] An operating mechanism is disposed in the mounting portion;

[0009] A connecting rod, one end of which extends to the mounting portion and is connected to the operating mechanism, and the other end extends into the first mounting cavity, wherein the first isolation portion is located on the side of the connecting rod closer to the operating mechanism, and the second isolation portion is located on the side of the connecting rod away from the operating mechanism;

[0010] A transmission assembly is disposed in the first mounting cavity and is connected to the connecting rod in a transmission manner.

[0011] A contact assembly is disposed in the second mounting cavity and is connected to the transmission assembly for closing or opening the circuit under the drive of the transmission assembly.

[0012] In an optional embodiment, the base includes at least two partitions, two adjacent partitions are disposed opposite to each other, the isolation portion is connected to at least a portion of the at least two partitions and forms at least one first mounting cavity, and another portion of the two adjacent partitions is used to form a second mounting cavity.

[0013] In an optional embodiment, the transmission assembly includes a lever and an insulating rod. The lever is rotatably disposed in the first mounting cavity, with one end connected to the connecting rod and the other end connected to the insulating rod. One end of the insulating rod extends into the second mounting cavity and is connected to the contact assembly.

[0014] In an optional embodiment, the transmission assembly further includes an insulating sleeve disposed in the first mounting cavity, the insulating pull rod disposed in the insulating sleeve, and the second isolation portion disposed opposite to the insulating sleeve.

[0015] In an optional embodiment, the second isolation portion has a plurality of first protrusions on the side away from the connecting rod, and the insulating sleeve has a plurality of second protrusions, with the plurality of first protrusions and the plurality of second protrusions arranged opposite to each other.

[0016] In an optional embodiment, the contact assembly includes a vacuum bulb, a moving contact, and a stationary contact. The vacuum bulb is disposed in the second mounting cavity, the moving contact is movably disposed within the vacuum bulb and connected to the insulating pull rod, and the stationary contact is disposed within the vacuum bulb.

[0017] In an optional embodiment, the lever is provided with a rotating part that rotatably engages with the base, and the rotating part is located between the end of the lever connected to the connecting rod and the end of the lever connected to the insulating pull rod.

[0018] In an optional embodiment, the operating mechanism includes a housing and a drive linkage and a drive cantilever disposed within the housing. The housing is disposed on the mounting portion. The drive cantilever includes a first connecting portion, a second connecting portion, and a third connecting portion. The first connecting portion is rotatably disposed on the housing. The second connecting portion is connected to the drive linkage. The third connecting portion is connected to the linkage. The drive linkage is used for the drive cantilever to rotate around the first connecting portion, so as to drive the linkage to move through the third connecting portion.

[0019] In an optional embodiment, the base is manufactured using a one-piece molding process.

[0020] Secondly, this utility model provides a low-voltage electrical device, including a circuit breaker as described in any of the foregoing embodiments.

[0021] The beneficial effects of the circuit breaker and low-voltage electrical equipment provided by this utility model embodiment include: the first isolation part is located on the side of the connecting rod close to the operating mechanism, which can isolate the potential between the connecting rod and the external environment, preventing the operating mechanism from being affected by the current; the second isolation part is located on the side of the connecting rod away from the operating mechanism, which further isolates the conduction path between the connecting rod and the main circuit current, preventing the main circuit current from being conducted to the operating mechanism through the connecting rod, avoiding the risk of the equipment being energized, thereby improving insulation and safety. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A cross-sectional view of a circuit breaker provided in an embodiment of this utility model;

[0024] Figure 2 A simplified structural diagram of the circuit breaker provided in this embodiment of the utility model;

[0025] Figure 3 This is a first-view structural diagram of the base and connecting rod provided in an embodiment of the present utility model;

[0026] Figure 4 This is a second-view structural diagram of the base and connecting rod provided in an embodiment of the present utility model.

[0027] Icons: 10-Circuit breaker; 100-Base; 110-First mounting cavity; 120-Second mounting cavity; 130-Mounting part; 140-First isolation part; 150-Second isolation part; 151-First protrusion; 160-Separation part; 200-Operating mechanism; 210-Housing; 220-Drive linkage; 230-Drive cantilever; 231-First connection part; 232-Second connection part; 233-Third connection part; 300-Linkage; 400-Transmission assembly; 410-Lever; 411-Rotating part; 420-Insulating pull rod; 430-Insulating sleeve; 431-Second protrusion; 500-Contact assembly; 510-Vacuum bulb; 520-Moving contact; 530-Stationary contact. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0033] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0034] As a critical protective device in power systems, circuit breakers primarily function to quickly disconnect circuits upon detecting abnormal conditions such as overloads or short circuits, preventing damage to electrical equipment and ensuring personnel safety. Circuit breakers typically rely on an operating mechanism that moves a linkage; the movement of the linkage controls the closing and opening of the moving and stationary contacts, ensuring circuit continuity.

[0035] However, existing circuit breakers lack effective internal insulation, making them susceptible to risks such as arc crossing, phase-to-phase short circuits, or short circuits to ground. This not only threatens the safety of the circuit breaker itself but may also trigger wider power system failures. This risk is particularly pronounced in compact designs where components are close together. Furthermore, without proper insulation, the circuit breaker's insulation performance may deteriorate over long-term operation due to environmental factors (such as moisture and dust), increasing the likelihood of leakage and reducing the equipment's operational stability and reliability.

[0036] Therefore, there is an urgent need to provide an improved circuit breaker design that incorporates necessary insulation structures to overcome the aforementioned problems in existing technologies, improve the safety, reliability, and service life of circuit breakers, and meet the demands of modern power systems for high-performance protection equipment. This design should effectively enhance the insulation performance and overall protection capability of the circuit breaker without sacrificing other performance indicators.

[0037] Based on the problems existing in the current technology, please refer to Figures 1 to 4 This utility model provides a circuit breaker 10 suitable for low-voltage electrical equipment, which not only achieves a compact spatial layout but also significantly improves the insulation performance and operational safety of the circuit breaker 10. Furthermore, this structural design simplifies the assembly process, improves production efficiency, and provides a reliable technical foundation for realizing miniaturized vacuum circuit breakers 10 at high voltage levels.

[0038] In detail, the circuit breaker 10 includes a base 100, an operating mechanism 200, a connecting rod 300, a transmission assembly 400, and a contact assembly 500. Through the reasonable spatial layout and functional division among the base 100, the operating mechanism 200, the connecting rod 300, the transmission assembly 400, and the contact assembly 500, a vacuum circuit breaker 10 device with a compact structure, excellent insulation performance, easy assembly, and stable operation is realized.

[0039] Specifically, the base 100 is provided with a first mounting cavity 110, a second mounting cavity 120, a mounting section 130, a first isolation section 140, and a second isolation section 150, which respectively carry and isolate different functional components, so that the functions of the various components inside the circuit breaker 10 do not interfere with each other, while improving the integration and stability of the overall structure. Among them, the first mounting cavity 110 is at least surrounded by the first isolation section 140 and is used to accommodate the transmission component 400, ensuring its stable operation in an insulating environment; while the second mounting cavity 120 is used to carry the contact component 500. The mounting section 130 and the second mounting cavity 120 are arranged opposite to each other, and the operating mechanism 200 is arranged in the mounting section 130, so that the operating mechanism 200 is away from the main circuit current path, avoiding the operating mechanism 200 from becoming energized due to current leakage, and ensuring operational safety.

[0040] One end of the connecting rod 300 extends to the mounting part 130 and is connected to the operating mechanism 200, while the other end extends into the first mounting cavity 110. The transmission assembly 400 is disposed in the first mounting cavity 110 and is connected to the connecting rod 300 in a transmission manner. The contact assembly 500 is disposed in the second mounting cavity 120 and is connected to the transmission assembly 400 in a transmission manner. This allows the action of the operating mechanism 200 to be transmitted to the transmission assembly 400 through the connecting rod 300, thereby driving the contact assembly 500 to complete the closing or opening action.

[0041] The first isolation part 140, located on the side of the connecting rod 300 closer to the operating mechanism 200, can isolate the potential between the connecting rod 300 and the external environment, preventing the operating mechanism 200 from being affected by current. The second isolation part 150, located on the side of the connecting rod 300 away from the operating mechanism 200, further isolates the conduction path between the connecting rod 300 and the main circuit current, preventing the main circuit current from being conducted to the operating mechanism 200 through the connecting rod 300, avoiding the risk of the equipment becoming energized, thereby improving the insulation safety of the overall system.

[0042] It can be seen that the overall transmission path of the circuit breaker 10 is clear and the operation is stable. Moreover, by reasonably configuring the isolation structure, it effectively solves the problems of large product size and low safety caused by insufficient dielectric insulation performance in traditional air circuit breakers 10.

[0043] Furthermore, by designing the base 100 as an integrated structure incorporating multiple functional cavities and isolation structures, and arranging the operating mechanism 200, connecting rod 300, transmission assembly 400, and contact assembly 500 in their respective mounting cavities, a compact spatial layout is achieved, significantly improving the insulation performance and operational safety of the circuit breaker 10. In addition, this structural design simplifies the assembly process, improves production efficiency, and provides a reliable technical foundation for realizing miniaturized vacuum circuit breakers 10 at high voltage levels.

[0044] Furthermore, the base 100 includes at least two partitions 160, with two adjacent partitions 160 disposed opposite to each other. An isolation portion is connected to at least a portion of the at least two partitions 160 and forms at least one first mounting cavity 110. Another portion of the two adjacent partitions 160 is used to form a second mounting cavity 120.

[0045] This design not only gives the base 100 good structural stability, but also achieves functional zoning and electrical isolation between the components inside the circuit breaker 10 through the reasonable layout of each functional cavity, thereby effectively improving the operational safety and assembly convenience of the circuit breaker 10.

[0046] Specifically, as shown in the figure, there are four partitions 160. The four partitions 160 are arranged in sequence to form three first mounting cavities 110 and three second mounting cavities 120. Each first mounting cavity 110 is connected to the adjacent second mounting cavity 120.

[0047] Furthermore, the transmission assembly 400 includes a lever 410 and an insulating pull rod 420. The lever 410 is rotatably disposed in the first mounting cavity 110, with one end connected to the connecting rod 300 and the other end connected to the insulating pull rod 420. One end of the insulating pull rod 420 extends into the second mounting cavity 120 and is connected to the contact assembly 500.

[0048] In this embodiment, lever 410 serves as a force-displacement conversion component. One end receives the up-and-down movement from connecting rod 300 and converts this movement into the opposite movement at the other end by rotating around a set rotation center, thereby driving the insulating pull rod 420 to move in a set direction. The insulating pull rod 420 not only transmits motion but also ensures potential isolation between the operating mechanism 200 and the main circuit of the contact assembly 500 through its own insulation properties, thereby effectively preventing the operating mechanism 200 from becoming energized due to current conduction.

[0049] Specifically, when the connecting rod 300 moves upward under the drive of the operating mechanism 200, the lever 410 rotates around its rotation center, causing the insulating pull rod 420 to move downward, thereby pushing the moving contact 520 in the contact assembly 500 to contact the stationary contact 530, thus achieving closing; conversely, when the connecting rod 300 moves downward, the lever 410 drives the insulating pull rod 420 to move upward, causing the moving contact 520 to separate from the stationary contact 530, thus achieving opening.

[0050] In this way, the transmission component 400 can not only ensure mechanical transmission efficiency, but also take into account electrical safety and operational stability.

[0051] Furthermore, the transmission assembly 400 also includes an insulating sleeve 430, which is disposed in the first mounting cavity 110, an insulating pull rod 420 is disposed in the insulating sleeve 430, and a second isolation part 150 is disposed opposite to the insulating sleeve 430.

[0052] As can be seen, when the circuit breaker 10 is in the closing or opening process, the insulating rod 420 and the insulating sleeve 430 move up and down together along the axial direction of the insulating rod 420, driving the contact assembly 500 to complete the closing or opening action. The insulating sleeve 430 not only plays a guiding and supporting role, but also ensures that there is no electrical connection between the operating mechanism 200 and the main circuit through its own insulation performance. Furthermore, its insulation performance is further increased by the second isolation part 150 to prevent accidental energization.

[0053] In addition, the second isolation section 150 is provided with a plurality of first protrusions 151 on the side away from the connecting rod 300, and the insulating sleeve 430 is provided with a plurality of second protrusions 431, with the plurality of first protrusions 151 and the plurality of second protrusions 431 arranged opposite to each other.

[0054] Therefore, by providing multiple first protrusions 151 on the side of the second isolation section 150 away from the connecting rod 300, and correspondingly providing multiple second protrusions 431 on the insulating sleeve 430, the two are arranged opposite to each other, thereby increasing the creepage path and improving the insulation reliability of the circuit breaker 10 under high voltage conditions. This not only meets the requirements of mechanical assembly and transmission guidance, but also has excellent electrical isolation capabilities, further improving the overall insulation protection system of the circuit breaker 10.

[0055] Furthermore, the contact assembly 500 includes a vacuum bulb 510, a moving contact 520, and a stationary contact 530. The vacuum bulb 510 is disposed in the second mounting cavity 120. The moving contact 520 is movably disposed in the vacuum bulb 510 and connected to the insulating pull rod 420. The stationary contact 530 is disposed in the vacuum bulb 510.

[0056] In this embodiment, the vacuum bulb 510, as the core encapsulation structure of the contact assembly 500, is disposed within the second mounting cavity 120. This cavity is defined by the spatial division structure within the base 100, providing a stable working environment for the vacuum bulb 510 and achieving electrical isolation from other components. The moving contact 520, as a movable conductive component, is movably disposed within the vacuum bulb 510 and forms a mechanical transmission connection with the insulating pull rod 420 through a connecting structure. Driven by the transmission assembly 400, it moves up and down, completing the contact or separation action with the stationary contact 530. The stationary contact 530 is fixed at a designated position within the vacuum bulb 510, serving as a fixed contact point in the circuit. When the moving contact 520 approaches, the circuit is connected; when the moving contact 520 moves away, the circuit is disconnected. Because the vacuum bulb 510 maintains a high vacuum state, the arc generated during the separation process of the moving and stationary contacts 530 can be quickly extinguished, greatly improving the arc extinguishing efficiency and operational stability of the circuit breaker 10 under high voltage and high current conditions.

[0057] Furthermore, the lever 410 is provided with a rotating part 411, which is rotatably engaged with the base 100. The rotating part 411 is located between the end of the lever 410 connected to the connecting rod 300 and the end of the lever 410 connected to the insulating pull rod 420.

[0058] In this embodiment, lever 410, as one of the core functional components of transmission assembly 400, directly affects the stability and efficiency of the circuit breaker 10 transmission system due to its structural design. Rotating part 411, serving as the rotation center of lever 410, is positioned between the two ends of lever 410, creating a seesaw-like structural layout. One end connects to connecting rod 300 and receives motion transmitted from operating mechanism 200, while the other end connects to insulating pull rod 420 and drives contact assembly 500 to complete closing and opening actions. Rotating part 411 forms a rotational fit with base 100, ensuring that lever 410 can rotate stably around this point during operation, while avoiding jamming or wear problems caused by uneven force or structural misalignment. This design not only enhances the structural rigidity and guiding accuracy of lever 410 during movement but also improves the mechanical durability and operational consistency of circuit breaker 10 under frequent operating conditions.

[0059] In addition, by setting rotating parts 411 at different parts of the lever 410, the lever 410 can be rotated around different rotation centers under the drive of the connecting rod 300, so as to meet the rotation requirements of different products.

[0060] For example, in this embodiment, the length ratio of the lever 410 on both sides of the rotating part 411 is 3.5:1, meaning that every 1 Newton of force on the connecting rod 300 can be converted into a 3.5 Newton of force on the insulating pull rod 420. Simultaneously, every 3.5 millimeters of displacement of the connecting rod 300 can drive a 1-millimeter displacement on the insulating pull rod 420. In this way, the force output by the operating mechanism 200 and the displacement of the moving contact 520 can be precisely controlled.

[0061] Furthermore, the operating mechanism 200 includes a housing 210 and a drive link 220 and a drive cantilever 230 disposed within the housing 210. The housing 210 is disposed on the mounting portion 130. The drive cantilever 230 includes a first connecting portion 231, a second connecting portion 232, and a third connecting portion 233. The first connecting portion 231 is rotatably disposed on the housing 210. The second connecting portion 232 is connected to the drive link 220. The third connecting portion 233 is connected to the link 300. The drive link 220 is used to drive the cantilever 230 to rotate around the first connecting portion 231, so as to drive the link 300 to move through the third connecting portion 233.

[0062] In detail, the drive cantilever 230 is roughly triangular in shape. The first connecting part 231 serves as its rotation fulcrum and is rotatably disposed inside the housing 210, ensuring that the drive cantilever 230 can swing around this point. The second connecting part 232 is connected to the drive link 220, receives the motion input from the drive link 220, and converts the input into the overall rotational motion of the drive cantilever 230. The third connecting part 233 is connected to the link 300 of the circuit breaker 10, converting the rotational motion of the drive cantilever 230 into the approximately linear motion of the link 300, thereby driving the transmission assembly 400 and the contact assembly 500 to complete the corresponding closing or opening actions. This arrangement allows the operating mechanism 200 to achieve efficient and precise control of the movement of the link 300 through the linkage structure of the drive link 220 and the drive cantilever 230, ensuring the operational reliability of the circuit breaker 10 under frequent operation and high voltage conditions.

[0063] Furthermore, the base 100 is made using a one-piece molding process, which not only ensures the accuracy of the spatial layout between the functional cavities and the isolation section, but also avoids problems such as misfitting errors, high assembly complexity, and reduced insulation performance caused by splicing multiple parts in traditional split structures.

[0064] Furthermore, the base 100, as the structure in the circuit breaker 10 that bears and isolates the load, has an integral molding design that reduces processing and assembly steps during manufacturing, thereby improving production efficiency. Since the base 100 no longer needs to be assembled from multiple independent parts, it can effectively eliminate potential hazards such as structural loosening, weak insulation points, or mechanical stress concentration caused by loose connections between parts, thus improving the overall operational stability and service life of the circuit breaker 10.

[0065] In summary, this utility model embodiment provides a circuit breaker 10. The first isolation part 140 is located on the side of the connecting rod 300 near the operating mechanism 200, which can isolate the potential between the connecting rod 300 and the external environment, preventing the operating mechanism 200 from being affected by current. The second isolation part 150 is located on the side of the connecting rod 300 away from the operating mechanism 200, which further isolates the conduction path between the connecting rod 300 and the main circuit current, preventing the main circuit current from being conducted to the operating mechanism 200 through the connecting rod 300, avoiding the risk of the equipment becoming energized, thereby improving the insulation safety of the overall system.

[0066] Furthermore, this utility model embodiment also provides a low-voltage electrical device, including the circuit breaker 10 as described in the above embodiments.

[0067] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A circuit breaker characterized by, include: The base (100) is provided with a first mounting cavity (110), a second mounting cavity (120), a mounting part (130), a first isolation part (140), and a second isolation part (150). The first isolation part (140) is used to surround the first mounting cavity (110), and the mounting part (130) and the second mounting cavity (120) are arranged opposite to each other. An operating mechanism (200) is provided on the mounting part (130); A connecting rod (300), one end of which extends to the mounting portion (130) and is connected to the operating mechanism (200), and the other end extends into the first mounting cavity (110), wherein the first isolation portion (140) is located on the side of the connecting rod (300) closer to the operating mechanism (200), and the second isolation portion (150) is located on the side of the connecting rod (300) away from the operating mechanism (200); A transmission assembly (400) is disposed in the first mounting cavity (110) and is connected to the connecting rod (300) in a transmission manner; A contact assembly (500) is disposed in the second mounting cavity (120) and is connected to the transmission assembly (400) for closing or opening under the drive of the transmission assembly (400).

2. The circuit breaker of claim 1, wherein, The base (100) includes at least two partitions (160), with two adjacent partitions (160) arranged opposite to each other. The partition is connected to at least a portion of the at least two partitions (160) and forms at least one first mounting cavity (110). Another portion of the two adjacent partitions (160) forms a second mounting cavity (120).

3. The circuit breaker according to claim 1, characterized in that, The transmission assembly (400) includes a lever (410) and an insulating rod (420). The lever (410) is rotatably disposed in the first mounting cavity (110), with one end connected to the connecting rod (300) and the other end connected to the insulating rod (420). One end of the insulating rod (420) extends into the second mounting cavity (120) and is connected to the contact assembly (500).

4. The circuit breaker according to claim 3, characterized in that, The transmission assembly (400) further includes an insulating sleeve (430), which is disposed in the first mounting cavity (110), and the insulating pull rod (420) is disposed in the insulating sleeve (430). The second isolation part (150) is disposed opposite to the insulating sleeve (430).

5. The circuit breaker according to claim 4, characterized in that, The second isolation section (150) has a plurality of first protrusions (151) on the side away from the connecting rod (300), and the insulating sleeve (430) has a plurality of second protrusions (431). The plurality of first protrusions (151) and the plurality of second protrusions (431) are arranged opposite to each other.

6. The circuit breaker according to claim 3, characterized in that, The contact assembly (500) includes a vacuum bulb (510), a moving contact (520), and a stationary contact (530). The vacuum bulb (510) is disposed in the second mounting cavity (120). The moving contact (520) is movably disposed in the vacuum bulb (510) and connected to the insulating pull rod (420). The stationary contact (530) is disposed in the vacuum bulb (510).

7. The circuit breaker according to claim 3, characterized in that, The lever (410) is provided with a rotating part (411), which is rotatably engaged with the base (100). The rotating part (411) is located between the end of the lever (410) connected to the connecting rod (300) and the end of the lever (410) connected to the insulating pull rod (420).

8. The circuit breaker according to claim 1, characterized in that, The operating mechanism (200) includes a housing (210) and a drive link (220) and a drive cantilever (230) disposed within the housing (210). The housing (210) is disposed on the mounting portion (130). The drive cantilever (230) includes a first connecting portion (231), a second connecting portion (232), and a third connecting portion (233). The first connecting portion (231) is rotatably disposed on the housing (210). The second connecting portion (232) is connected to the drive link (220). The third connecting portion (233) is connected to the link (300). The drive link (220) is used for the drive cantilever (230) to rotate around the first connecting portion (231) so as to drive the link (300) to move through the third connecting portion (233).

9. The circuit breaker according to claim 1, characterized in that, The base (100) is made using a one-piece molding process.

10. A low-voltage electrical device, characterized in that, Including the circuit breaker as described in any one of claims 1-9.

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