Arc extinguishing system and circuit breaker
By designing arc extinguishing channels with different widths and combining the first and second arc extinguishing units, the problem that arc extinguishing systems in the prior art is difficult to take into account the arc extinguishing effect under different current conditions, and effective breaking and arc extinguishing of large and small currents is achieved to ensure the safety of circuits and equipment.
Patent Information
- Application Number
- CN202420764944.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-12
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-04-12
AI Technical Summary
When the existing arc extinguishing system is short-circuited and the critical load and small current are broken, it is difficult to take into account the arc extinguishing effect, and there is a risk of arc transfer difficulty or the small arc cannot be cut off.
An arc extinguishing system is designed, including at least one first arc extinguishing unit and at least one second arc extinguishing unit. The width of the first arc extinguishing channel is greater than the width of the second arc extinguishing channel, and is used to process large currents and small currents respectively to ensure that arc extinguishing can be effectively under different current conditions.
It can ensure the arc extinguishing effect in the state of high current short circuit breaker and critical load and small current breaker, avoid the problem of arc transfer difficulty and small arc failure, and ensure the protection of circuits and equipment.
Smart Images
Figure CN222690621U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of electrical equipment, and in particular, relates to an arc extinguishing system and a circuit breaker. Background Art
[0002] During the circuit breaking process, the DC frame circuit breaker will face high current short circuit breaking and critical load low current breaking under different working conditions. Since the arc extinguishing system structure is fixed, the reliability of the breaking will be different when the current is different. That is, the breaking performance of the arc extinguishing system structure will have different characteristics when breaking large and small currents.
[0003] When the gap between the gas-producing material splints of the arc extinguishing system is small, it can effectively cut off the critical load small current, but a gap that is too small will make it difficult to transfer the arc during a large current short-circuit interruption, which poses a serious risk. However, if the gap between the gas-producing material splints is large, it will not be possible to cut off the small arc generated by the critical load small current. Therefore, the current arc extinguishing system cannot take into account the arc extinguishing effect under both the large current short-circuit interruption and the critical load small current interruption state. Utility Model Content
[0004] The present application provides an arc extinguishing system and a circuit breaker. In both the high-current short-circuit breaking state and the critical-load low-current breaking state, the arc extinguishing system can ensure the arc extinguishing effect and avoid risks during the arc transfer process.
[0005] The present application provides an arc extinguishing system, which is used to extinguish an arc on a contact system connected in series in a circuit breaker. The arc extinguishing system includes at least one first arc extinguishing unit and at least one second arc extinguishing unit arranged in sequence. The first arc extinguishing unit includes a first gas-producing component and a first arc extinguishing component connected to each other, and the first gas-producing component includes a first arc extinguishing channel arranged through it; the second arc extinguishing unit includes a second gas-producing component and a second arc extinguishing component connected to each other, and the second gas-producing component includes a second arc extinguishing channel arranged through it. The first width D1 of the first arc extinguishing channel and the second width D2 of the second arc extinguishing channel have the following relationship: D1>D2.
[0006] In the arc extinguishing system as above, the first width D1 has the following range: D1>20 mm.
[0007] In the arc extinguishing system as above, the second width D2 has the following range: D2<15 mm.
[0008] In the arc extinguishing system as above, the first gas producing component includes two first gas producing sheets arranged at an interval, and a first arc extinguishing channel is formed between the two first gas producing sheets.
[0009] In the arc extinguishing system as above, the second gas producing assembly includes two second gas producing sheets arranged at an interval, and a second arc extinguishing channel is formed between the two second gas producing sheets.
[0010] On the other hand, the present application also provides a circuit breaker, which includes the above-mentioned arc extinguishing system, and the circuit breaker also includes: a contact system, including multiple contact assemblies, each contact assembly is arranged corresponding to one of the first arc extinguishing units or one of the second arc extinguishing units; a busbar system, used to connect an external power supply and a load, the busbar system includes multiple busbar assemblies, and the multiple busbar assemblies are arranged in a one-to-one correspondence with the multiple contact assemblies.
[0011] As above circuit breaker, wherein the contact assembly includes a moving contact and a stationary contact, the moving contact is rotatably arranged, and the moving contact can be rotated to contact or separate from the stationary contact, and in a plane perpendicular to the direction from the contact system to the arc extinguishing system, the projection of the movement range of the moving contact all falls within the projection range of the first arc extinguishing channel or the second arc extinguishing channel.
[0012] As in the circuit breaker above, the moving contact includes a moving arc contact, the stationary contact includes a stationary arc contact, the moving arc contact and the stationary arc contact are arranged relative to each other, the moving contact and the stationary contact can be electrically connected through the moving arc contact and the stationary arc contact, and the moving arc contact and the stationary arc contact are both in the first arc extinguishing channel or the second arc extinguishing channel.
[0013] As in the circuit breaker above, each busbar assembly includes an upper busbar and a lower busbar, multiple upper busbars in the busbar system are connected to corresponding contact assemblies, one of the lower busbars in the busbar system is connected to an external power supply, and another lower busbar is connected to an external load.
[0014] In the circuit breaker as above, the moving contact includes a moving main contact, the static contact includes a static main contact, the moving main contact and the static main contact are arranged in relative positions, and the static main contact is electrically connected to the corresponding upper busbar.
[0015] The arc extinguishing system of the present application includes at least one first arc extinguishing unit and at least one second arc extinguishing unit arranged in sequence, the first arc extinguishing unit includes a first gas-producing component and a first arc extinguishing component connected to each other, the first gas-producing component includes a first arc extinguishing channel arranged therethrough, the second arc extinguishing unit includes a second gas-producing component and a second arc extinguishing component connected to each other, the second gas-producing component includes a second arc extinguishing channel arranged therethrough, the first width D1 of the first arc extinguishing channel is greater than the second width D2 of the second arc extinguishing channel, when the internal series-connected contact system is disconnected, the first width D1 of the first arc extinguishing channel is larger, and can effectively disconnect large currents, and the arc with high intensity generated by the large current can be quickly transferred from the first arc extinguishing channel to the first arc extinguishing component for arc extinguishing, thereby avoiding the situation where the internal components of the circuit breaker are burned due to the difficulty in arc transfer; the second width D2 of the second arc extinguishing channel is smaller, and can reliably cut off the arc generated by the critical load small current and shorten the arc burning time, thereby effectively disconnecting the critical small current.
[0016] The present application adopts a first gas-producing component and a second gas-producing component with two different channel widths. When a large current or a small current passes through the overall circuit of the circuit breaker, as long as one of the first arc extinguishing unit and the second arc extinguishing unit can successfully interrupt the current, the overall interruption can be completed. Therefore, in the state of large current short-circuit interruption and critical load small current interruption, the arc extinguishing system can ensure the arc extinguishing effect, avoid risks in the arc transfer process, and realize the protection of circuits and equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0018] Figure 1 A schematic diagram of the structure of the arc extinguishing system of an embodiment of the present application;
[0019] Figure 2 A schematic diagram of the internal structure of a circuit breaker according to an embodiment of the present application;
[0020] Figure 3 A top view of a circuit breaker according to an embodiment of the present application.
[0021] Description of Figure Numbers:
[0022] 10. First arc extinguishing unit; 11. First gas producing component; 111. First arc extinguishing channel; 112. First gas producing sheet; 12. First arc extinguishing component; 20. Second arc extinguishing unit; 21. Second gas producing component; 211. Second arc extinguishing channel; 212. Second gas producing sheet; 22. Second arc extinguishing component; 30. Contact assembly; 31. Moving contact; 32. Static contact; 33. Moving arc contact; 34. Static arc contact; 35. Moving main contact; 36. Static main contact; 40. Busbar assembly; 41. Upper busbar; 42. Lower busbar;
[0023] 100. Arc extinguishing system; 200. Contact system; 300. Busbar system. DETAILED DESCRIPTION
[0024] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.
[0025] like Figures 1 to 3 As shown, an embodiment of the present application provides an arc extinguishing system, which is used to extinguish an arc on a contact system 200 connected in series in a circuit breaker. The arc extinguishing system 100 includes at least one first arc extinguishing unit 10 and at least one second arc extinguishing unit 20 arranged in sequence. The first arc extinguishing unit 10 includes a first gas-producing component 11 and a first arc extinguishing component 12 connected to each other, and the first gas-producing component 11 includes a first arc extinguishing channel 111 arranged through it; the second arc extinguishing unit 20 includes a second gas-producing component 21 and a second arc extinguishing component 22 connected to each other, and the second gas-producing component 21 includes a second arc extinguishing channel 211 arranged through it, and a first width D1 of the first arc extinguishing channel 111 and a second width D2 of the second arc extinguishing channel 211 have the following relationship: D1>D2.
[0026] In a specific implementation, the arc extinguishing system of the embodiment of the present application includes at least one first arc extinguishing unit 10 and at least one second arc extinguishing unit 20 arranged in sequence, the first arc extinguishing unit 10 includes a first gas-producing component 11 and a first arc extinguishing component 12 connected to each other, the first gas-producing component 11 includes a first arc extinguishing channel 111 arranged through, the second arc extinguishing unit 20 includes a second gas-producing component 21 and a second arc extinguishing component 22 connected to each other, the second gas-producing component 21 includes a second arc extinguishing channel 211 arranged through, and the first width D1 of the first arc extinguishing channel 111 is greater than the second arc extinguishing channel 21 1, when the internal series-connected contact system 200 is disconnected, the first width D1 of the first arc extinguishing channel 111 is relatively large, which can effectively disconnect the large current. The arc with high intensity generated by the large current can be quickly transferred from the first arc extinguishing channel 111 to the first arc extinguishing component 12 for arc extinguishing, thereby avoiding the situation where the internal components of the circuit breaker are burned due to the difficulty of arc transfer; the second width D2 of the second arc extinguishing channel 211 is relatively small, which can reliably cut off the arc generated by the critical load small current and shorten the arc burning time, thereby effectively disconnecting the critical small current.
[0027] The embodiment of the present application adopts a first gas-producing component 11 and a second gas-producing component 21 with two different channel widths. When a large current or a small current passes through the overall circuit of the circuit breaker, as long as one of the first arc extinguishing unit 10 and the second arc extinguishing unit 20 can successfully interrupt the current, the overall interruption can be completed. Therefore, in the state of large current short-circuit interruption and critical load small current interruption, the arc extinguishing system can ensure the arc extinguishing effect, avoid risks in the arc transfer process, and achieve protection of circuits and equipment.
[0028] Specifically, Figure 1 As shown, the arc extinguishing system 100 includes a first arc extinguishing unit 10 and a second arc extinguishing unit 20 arranged side by side, which can be applied to a contact system 200 with two contact assemblies 30. It is the simplest structure of the arc extinguishing system 100 that can simultaneously take into account both large current and small current interruption.
[0029] like Figure 3 As shown, in the arc extinguishing system of the embodiment of the present application, the first width D1 has the following range: D1>20mm.
[0030] In specific implementation, the first width D1 is set to be greater than 20 mm, which can ensure that the arc has enough space to pass through the first arc extinguishing channel 111. Generally, the arc intensity generated by large current is large and the transfer speed is fast. In the case of sufficient space, the arc can be quickly transferred until it enters the first arc extinguishing component 12 for complete arc extinguishing, avoiding the situation where the internal components of the circuit breaker are burned due to the difficulty of arc transfer. Therefore, in the case of large current in the circuit, the first width D1 of the first arc extinguishing channel 111 has a width of more than 20 mm, which can completely extinguish the arc generated by the large current, and realize the overall disconnection of the circuit breaker circuit under large current conditions.
[0031] like Figure 3 As shown, in the arc extinguishing system of the embodiment of the present application, the second width D2 has the following range: D2<15mm.
[0032] In specific implementation, the second width D2 is set to be less than 15mm, so that when the circuit breaker is disconnected at a small current, the arc with a smaller intensity generated by the contact system 200 can fully contact the two side walls of the second arc extinguishing channel 211. Since the two side walls of the second arc extinguishing channel 211 are both gas-producing materials, when the arc contacts them, a large amount of gas with thrust will be generated, which pushes the small arc to quickly pass through the second arc extinguishing channel 211 and enter the second arc extinguishing component 22 for complete arc extinguishing. Therefore, when there is a small current in the circuit, the second arc extinguishing channel 211 has a second width D2 of less than 15mm, which can make the small arc generated by the small current disconnection fully contact with the second gas-producing component 21, and help the small arc to fully enter the second arc extinguishing component 22, so that the small arc can be completely extinguished, and the overall disconnection of the circuit breaker circuit under the condition of small current is realized.
[0033] like Figure 1 As shown, in the arc extinguishing system of the embodiment of the present application, the first gas producing component 11 includes two first gas producing sheets 112 arranged at an interval, and a first arc extinguishing channel 111 is formed between the two first gas producing sheets 112 .
[0034] In specific implementation, when the arc generated by a large current passes through the first arc extinguishing channel 111, it contacts both first gas producing sheets 112. The two first gas producing sheets 112 generate gas under the erosion of the arc. The gas helps the arc enter the first arc extinguishing assembly 12 for complete arc extinguishing, so that the circuit breaker can interrupt the large current.
[0035] like Figure 1 As shown, in the arc extinguishing system of the embodiment of the present application, the second gas producing component 21 includes two second gas producing sheets 212 arranged at an interval, and a second arc extinguishing channel 211 is formed between the two second gas producing sheets 212 .
[0036] In specific implementation, when the arc generated by a small current passes through the second arc extinguishing channel 211, it contacts both second gas producing sheets 212. The two second gas producing sheets 212 generate gas under the erosion of the arc. The gas helps the arc enter the second arc extinguishing assembly 22 for complete arc extinguishing, so that the circuit breaker can interrupt large currents.
[0037] like Figure 2 and Figure 3 As shown, an embodiment of the present application further provides a circuit breaker, which includes the above-mentioned arc extinguishing system, and the circuit breaker also includes: a contact system 200, including a plurality of contact assemblies 30, each contact assembly 30 is arranged corresponding to one of the first arc extinguishing units 10 or one of the second arc extinguishing units 20; a busbar system 300, used to connect an external power supply and a load, the busbar system 300 includes a plurality of busbar assemblies 40, and the plurality of busbar assemblies 40 are arranged in a one-to-one correspondence with the plurality of contact assemblies 30.
[0038] In a specific implementation, the circuit breaker includes an arc extinguishing system 100, a contact system 200 and a busbar system 300. Each contact assembly 30 is arranged corresponding to one of the first arc extinguishing units 10 or one of the second arc extinguishing units 20. The arc generated by the disconnection of each contact assembly 30 can be extinguished by the corresponding first arc extinguishing unit 10 or the second arc extinguishing unit 20 to complete the overall disconnection of the circuit breaker; the multiple busbar assemblies 40 of the busbar system 300 can supply power to the corresponding multiple contact assemblies 30, and the mutual connection between the multiple busbar assemblies 40 also enables the multiple contact assemblies 30 in the circuit breaker to be electrically connected, thereby completing the series connection of the multiple contact assemblies 30.
[0039] like Figure 2 As shown, a circuit breaker of an embodiment of the present application, wherein the contact assembly 30 includes a moving contact 31 and a stationary contact 32, the moving contact 31 is rotatably arranged, and the moving contact 31 can be rotated to contact or separate from the stationary contact 32, and in a plane perpendicular to the direction from the contact system 200 to the arc extinguishing system 100, the projection of the movement range of the moving contact 31 all falls within the projection range of the first arc extinguishing channel 111 or the second arc extinguishing channel 211.
[0040] In specific implementation, when the moving contact 31 of the contact assembly 30 rotates and separates from the stationary contact 32, an arc will be generated between the two, and the arc will gradually lengthen as the moving contact 31 separates from the stationary contact 32. In a plane perpendicular to the direction from the contact system 200 to the arc extinguishing system 100, the projection of the movement range of the moving contact 31 all falls within the projection range of the first arc extinguishing channel 111 or the second arc extinguishing channel 211. Such a setting ensures that the movement range of the moving contact 31 will not exceed the coverage range of the first arc extinguishing channel 111 or the second arc extinguishing channel 211. When the arc is transferred from the moving contact 31 and the stationary contact 32 to the first arc extinguishing channel 111 or the second arc extinguishing channel 211, the arc will not leak to other parts in the circuit breaker, thereby avoiding damage to other parts in the circuit breaker.
[0041] like Figure 2 and Figure 3 As shown, a circuit breaker of an embodiment of the present application, wherein the moving contact 31 includes a moving arc contact 33, and the stationary contact 32 includes a stationary arc contact 34, the moving arc contact 33 and the stationary arc contact 34 are arranged relative to each other, the moving contact 31 and the stationary contact 32 can be electrically connected through the moving arc contact 33 and the stationary arc contact 34, and the moving arc contact 33 and the stationary arc contact 34 are both in the first arc extinguishing channel 111 or the second arc extinguishing channel 211.
[0042] In specific implementation, during the separation of the moving contact 31 and the stationary contact 32 of the contact assembly 30, the moving arc contact 33 and the stationary arc contact 34 are usually separated first, so an arc is generated between the moving arc contact 33 and the stationary arc contact 34. Since the moving arc contact 33 and the stationary arc contact 34 are both in the first arc extinguishing channel 111 or the second arc extinguishing channel 211, the arc generated by the separation of the moving arc contact 33 and the stationary arc contact 34 can all enter the first arc extinguishing channel 111 or the second arc extinguishing channel 211, and will not leak to other parts in the circuit breaker, thereby avoiding damage to other parts in the circuit breaker. Moreover, the arc generated by the separation of the moving arc contact 33 and the stationary arc contact 34 can contact the gas-generating material at the moment of generation, and the gas generated by the gas-generating material can quickly push the arc to move, thereby ensuring the arc extinguishing effect inside the circuit breaker.
[0043] like Figure 2 and Figure 3 As shown, the circuit breaker of the embodiment of the present application, wherein each busbar assembly 40 includes an upper busbar 41 and a lower busbar 42, multiple upper busbars 41 in the busbar system 300 are connected to the corresponding contact assemblies 30, one of the lower busbars 42 of the busbar system 300 is connected to an external power supply, and the other lower busbar 42 is connected to an external load.
[0044] During specific implementation, the busbar system 300 serves as the overall power supply and electrical connection system of the circuit breaker, and its upper busbar 41 is correspondingly connected to the corresponding contact assembly 30, so that the busbar systems 300 are connected in series as a whole. One of the lower busbars 42 of the busbar system 300 is connected to the external power supply, and the other lower busbar 42 is connected to the external load. The entire circuit breaker is connected in series between the external power supply and the external load through these two lower busbars 42, so that the circuit breaker can realize power supply control of the external load.
[0045] like Figure 2 and Figure 3 As shown, the circuit breaker of the embodiment of the present application, wherein the moving contact 31 includes a moving main contact 35, the static contact 32 includes a static main contact 36, the moving main contact 35 and the static main contact 36 are arranged in relative positions, and the static main contact 36 is electrically connected to the corresponding upper busbar 41.
[0046] During specific implementation, the moving main contact 35 and the static main contact 36 are arranged relative to each other. When the moving main contact 35 and the static main contact 36 are in contact, the current of the upper busbar 41 can enter the static main contact 36 through the moving main contact 35, so that the contact assembly 30 is completely in a conducting state, and the circuit breaker can realize power supply control for the external load.
[0047] Specifically, the moving main contact 35 and the static main contact 36 are both arranged outside the first arc extinguishing channel 111 or the second arc extinguishing channel 211, and are spaced apart from the moving arc contact 33 and the static arc contact 34, so as to avoid the arc generated by the separation of the moving arc contact 33 and the static arc contact 34 from interfering with the moving main contact 35 and the static main contact 36, thereby ensuring that the contact assembly 30 can be closed or disconnected normally.
[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.
[0049] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.
Claims
1. An arc extinguishing system, characterized in that: Used for extinguishing an arc on a contact system (200) connected in series in a circuit breaker, the arc extinguishing system (100) comprising at least one first arc extinguishing unit (10) and at least one second arc extinguishing unit (20) arranged in sequence, the first arc extinguishing unit (10) comprising a first gas-producing component (11) and a first arc extinguishing component (12) connected to each other, the first gas-producing component (11) comprising a first arc extinguishing channel (111) arranged through the first arc extinguishing channel; the second arc extinguishing unit (20) comprising a second gas-producing component (21) and a second arc extinguishing component (22) connected to each other, the second gas-producing component (21) comprising a second arc extinguishing channel (211) arranged through the first arc extinguishing channel (111) and a second width D2 of the second arc extinguishing channel (211) having the following relationship: D1>D2.
2. The arc extinguishing system according to claim 1, characterized in that: The first width D1 has the following range: D1>20 mm.
3. The arc extinguishing system according to claim 1, characterized in that: The second width D2 has the following range: D2<15 mm.
4. The arc extinguishing system according to claim 1, characterized in that: The first gas generating assembly (11) comprises two first gas generating sheets (112) arranged at an interval, and the first arc extinguishing channel (111) is formed between the two first gas generating sheets (112).
5. The arc extinguishing system according to claim 1, characterized in that: The second gas generating assembly (21) comprises two second gas generating sheets (212) arranged at an interval, and the second arc extinguishing channel (211) is formed between the two second gas generating sheets (212).
6. A circuit breaker, characterized in that: The arc extinguishing system according to any one of claims 1 to 5, wherein the circuit breaker further comprises: A contact system (200), comprising a plurality of contact assemblies (30), each of the contact assemblies (30) being arranged corresponding to one of the first arc extinguishing units (10) or one of the second arc extinguishing units (20); A busbar system (300) is used to connect an external power source and a load, wherein the busbar system (300) comprises a plurality of busbar assemblies (40), wherein the plurality of busbar assemblies (40) are arranged in a one-to-one correspondence with the plurality of contact assemblies (30).
7. The circuit breaker according to claim 6, characterized in that: The contact assembly (30) comprises a moving contact (31) and a stationary contact (32); the moving contact (31) is rotatably arranged and can be rotated to be in contact with or separated from the stationary contact (32); and within a plane perpendicular to the direction from the contact system (200) to the arc extinguishing system (100), the projection of the movement range of the moving contact (31) all falls within the projection range of the first arc extinguishing channel (111) or the second arc extinguishing channel (211).
8. The circuit breaker according to claim 7, characterized in that: The moving contact (31) includes a moving arc contact (33), and the stationary contact (32) includes a stationary arc contact (34). The moving arc contact (33) and the stationary arc contact (34) are arranged relative to each other. The moving contact (31) and the stationary contact (32) can be electrically connected through the moving arc contact (33) and the stationary arc contact (34). The moving arc contact (33) and the stationary arc contact (34) are both located in the first arc extinguishing channel (111) or the second arc extinguishing channel (211).
9. The circuit breaker according to claim 7, characterized in that: Each of the busbar assemblies (40) comprises an upper busbar (41) and a lower busbar (42); a plurality of the upper busbars (41) in the busbar system (300) are connected to corresponding contact assemblies (30); one of the lower busbars (42) in the busbar system (300) is connected to an external power source, and another of the lower busbars (42) is connected to an external load.
10. The circuit breaker according to claim 9, characterized in that The moving contact (31) includes a moving main contact (35), and the stationary contact (32) includes a stationary main contact (36). The moving main contact (35) and the stationary main contact (36) are arranged in relative positions, and the stationary main contact (36) is electrically connected to the corresponding upper busbar (41).