Circuit breaker extension structure

Abstract

The utility model provides an extension structure of circuit breaker belongs to circuit breaker field, include: install on the mounting plate A phase, B phase, C phase interface copper bar, A phase interface copper bar is connected to the A phase incoming line end of circuit breaker body through A phase incoming line connection copper bar connection, B phase interface copper bar is connected to the B phase incoming line end of circuit breaker body through B phase incoming line connection copper bar connection, C phase interface copper bar is connected to the C phase incoming line end of circuit breaker body through C phase incoming line connection copper bar connection, the A phase outgoing line end of circuit breaker body is connected to A phase outgoing line extension copper bar, the B phase outgoing line end of circuit breaker body is connected to B phase outgoing line extension copper bar, the C phase outgoing line end of circuit breaker body is connected to C phase outgoing line extension copper bar, reduce the height of circuit breaker, the cabinet space of circuit breaker occupied is reduced greatly, especially the space of cabinet height direction, improve equipment power density, increase the wiring space of circuit breaker body on the cabinet, improve the wiring height, the field construction wiring is convenient, reduce the operation difficulty.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to circuit breaker extension structures. Background Technology

[0002] Molded case circuit breakers (MCCBs) serve as switching devices between equipment and the power grid, functioning to interrupt alternating current and protect equipment and personnel. Figure 1 This diagram illustrates the installation of a conventional circuit breaker body 40 on a cabinet 100. Conventional circuit breakers require a large installation space, especially in the vertical direction, necessitating the provision of space for personnel wiring, resulting in low equipment space utilization. Furthermore, conventional circuit breakers have a simple design with only one mounting hole for both input and output ports, making it impossible to connect multiple cables in parallel. Utility Model Content

[0003] The technical problem to be solved by this utility model is: how to solve the problem that the existing circuit breakers require a large installation space, resulting in low equipment space utilization.

[0004] This utility model solves the above-mentioned technical problems through the following technical solution: a circuit breaker extension structure, including: an A-phase interface copper busbar, a B-phase interface copper busbar, and a C-phase interface copper busbar mounted on a mounting plate; the A-phase interface copper busbar is connected to the A-phase input terminal of the circuit breaker body through an A-phase input line connecting copper busbar; the B-phase interface copper busbar is connected to the B-phase input terminal of the circuit breaker body through a B-phase input line connecting copper busbar; the C-phase interface copper busbar is connected to the C-phase input terminal of the circuit breaker body through a C-phase input line connecting copper busbar; the A-phase output terminal of the circuit breaker body is connected to the A-phase output extension copper busbar; the B-phase output terminal of the circuit breaker body is connected to the B-phase output extension copper busbar; and the C-phase output terminal of the circuit breaker body is connected to the C-phase output extension copper busbar.

[0005] This utility model discloses a circuit breaker extension structure. The A-phase, B-phase, and C-phase incoming terminals of the circuit breaker body are connected to the A-phase, B-phase, and C-phase interface copper busbars, respectively. The A-phase, B-phase, and C-phase outgoing terminals of the circuit breaker body are connected to the cables inside the cabinet via A-phase, B-phase, and C-phase outgoing extension copper busbars, respectively. By transferring the incoming terminals of the circuit breaker body to the side through the copper busbar structure and extending the outgoing terminals of the circuit breaker body using copper busbars, firstly, the height of the circuit breaker can be reduced, significantly reducing the cabinet space occupied by the circuit breaker, especially the space in the cabinet height direction, thereby increasing the power density of the equipment; secondly, it can increase the wiring space of the circuit breaker body on the cabinet, increase the wiring height, facilitate on-site construction wiring, and reduce the difficulty of operation.

[0006] Preferably, the A-phase, B-phase, and C-phase interface copper busbars are all U-shaped and pass through the mounting plate. One end of each of the A-phase, B-phase, and C-phase interface copper busbars on one side of the mounting plate is the incoming line end, and the other end on the other side of the mounting plate is the connecting end. The A-phase and C-phase interface copper busbars have the same length extending out of the mounting plate, while the B-phase interface copper busbar has a longer length extending out of the mounting plate than the A-phase interface copper busbar. The connecting ends of the A-phase and B-phase interface copper busbars have the same length, while the connecting end of the C-phase interface copper busbar has a longer length than the connecting end of the A-phase interface copper busbar.

[0007] By setting the lengths of the A-phase, B-phase, and C-phase interface copper busbars extending out of the mounting plate, as well as the lengths of the connection ends of the three interface copper busbars, the A-phase, B-phase, and C-phase wiring copper busbars are staggered to achieve phase isolation.

[0008] Preferably, there are phase spacers between the A-phase and B-phase copper busbars, between the B-phase and C-phase copper busbars, and between the C-phase copper busbar and the edge of the mounting plate. This prevents phase-to-phase short circuits and accidental cable contact.

[0009] Preferably, the A-phase incoming line connecting copper busbar, the B-phase incoming line connecting copper busbar, and the C-phase incoming line connecting copper busbar are arranged in parallel and staggered. One end of the A-phase incoming line connecting copper busbar is connected to the connection end of the A-phase interface copper busbar, and the other end of the A-phase incoming line connecting copper busbar is connected to the A-phase incoming line terminal of the circuit breaker body. One end of the B-phase incoming line connecting copper busbar is connected to the connection end of the B-phase interface copper busbar, and the other end of the B-phase incoming line connecting copper busbar is connected to the B-phase incoming line terminal of the circuit breaker body. One end of the C-phase incoming line connecting copper busbar is connected to the connection end of the C-phase interface copper busbar, and the other end of the C-phase incoming line connecting copper busbar is connected to the C-phase incoming line terminal of the circuit breaker body.

[0010] Preferably, the A-phase interface copper busbar, B-phase interface copper busbar, and C-phase interface copper busbar are provided with insulating baffles at the penetration positions on the mounting plate.

[0011] Preferably, the incoming terminals of the A-phase interface copper busbar, the B-phase interface copper busbar, and the C-phase interface copper busbar have one or at least two terminals, and the at least two terminals are arranged in a stepped manner.

[0012] By setting at least two terminals at the incoming ends of the A-phase, B-phase, and C-phase interface copper busbars, when the cable connected to the incoming end is thick, the cable is divided into multiple branches, and each branch is connected to a terminal, thereby meeting the wiring requirements of different cable types.

[0013] Preferably, the A-phase outgoing cable extension copper busbar, B-phase outgoing cable extension copper busbar, and C-phase outgoing cable extension copper busbar are each provided with multiple mounting holes. This facilitates the parallel connection of multiple cables within the cabinet.

[0014] Preferably, both the A-phase outgoing extension copper busbar and the C-phase outgoing extension copper busbar are bent copper busbars, while the B-phase outgoing extension copper busbar is a straight copper busbar. The bent part of the A-phase outgoing extension copper busbar is connected to the A-phase outgoing terminal of the circuit breaker body, and the bent part of the C-phase outgoing extension copper busbar is connected to the C-phase outgoing terminal of the circuit breaker body.

[0015] By setting the A-phase outgoing line extension copper busbar and the C-phase outgoing line extension copper busbar as bent copper busbars, the phase spacing between the A-phase outgoing line extension copper busbar and the B-phase outgoing line extension copper busbar, and between the B-phase outgoing line extension copper busbar and the C-phase outgoing line extension copper busbar, is increased, thereby improving safety.

[0016] Preferably, the circuit breaker body is mounted on a mounting plate, and the incoming terminals of the phase A, phase B, and phase C interface copper busbars are located on the same side of the mounting plate. This facilitates on-site wiring and reduces operational difficulty.

[0017] Preferably, the incoming ends of the A-phase interface copper busbar, B-phase interface copper busbar, and C-phase interface copper busbar are respectively connected to cables, and the ends of the A-phase outgoing extension copper busbar, B-phase outgoing extension copper busbar, and C-phase outgoing extension copper busbar are fixed on the cabinet. Multiple cables are connected in parallel and run through the A-phase outgoing extension copper busbar, B-phase outgoing extension copper busbar, and C-phase outgoing extension copper busbar inside the cabinet.

[0018] The advantages of this utility model are: it does not require modification of the circuit breaker body, but only requires design of the copper busbar structure. By adjusting the copper busbar structure, it can meet different wiring requirements, and is low in cost and highly flexible. Attached Figure Description

[0019] Figure 1 A schematic diagram showing an existing circuit breaker installed on a cabinet; Figure 2 An exploded view of the circuit breaker extension structure provided in Embodiment 1 of this utility model; Figure 3 A perspective view of the circuit breaker extension structure provided in Embodiment 1 of this utility model; Figure 4 This is a front view of the circuit breaker extension structure provided in Embodiment 1 of this utility model; Figure 5 This is a top view of the circuit breaker extension structure provided in Embodiment 1 of this utility model; Figure 6 Rear view of the circuit breaker extension structure provided in Embodiment 1 of this utility model; Figure 7 A perspective view of the circuit breaker extension structure provided in Embodiment 1 of this utility model; Figure 8 A schematic diagram of the A-phase interface copper busbar in the circuit breaker extension structure provided in Embodiment 1 of this utility model; Figure 9A perspective view of the circuit breaker extension structure provided in Embodiment 2 of this utility model; Figure 10 A schematic diagram of the circuit breaker extension structure provided in Embodiment 3 of this utility model; Figure 11 This is a schematic diagram of the A-phase outgoing line extension copper busbar in the circuit breaker extension structure provided in Embodiment 3 of this utility model; Figure 12 A schematic diagram of the circuit breaker extension structure provided in Embodiment 1 of this utility model installed on the cabinet; In the diagram: 11A phase interface copper busbar, 111 incoming line terminal, 112 connecting terminal, 12B phase interface copper busbar, 13C phase interface copper busbar, 20 mounting plate, 31A phase incoming line connecting copper busbar, 32B phase incoming line connecting copper busbar, 33C phase incoming line connecting copper busbar, 40 circuit breaker body, 51A phase outgoing line extension copper busbar, 511A phase outgoing line extension copper busbar bending section, 52B phase outgoing line extension copper busbar, 53C phase outgoing line extension copper busbar, 531C phase outgoing line extension copper busbar bending section, 61 phase spacer, 62 insulating baffle, 71 first connector, 72 second connector, 73 third connector, 74 fourth connector, 100 cabinet. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model are described clearly and completely below with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0021] Example 1 like Figure 2 As shown, this embodiment provides a circuit breaker extension structure, including: an A-phase interface copper busbar 11, a B-phase interface copper busbar 12, and a C-phase interface copper busbar 13 mounted on a mounting plate 20. The A-phase interface copper busbar 11 is connected to the A-phase input terminal of the circuit breaker body 40 via an A-phase input line connecting copper busbar 31. The B-phase interface copper busbar 12 is connected to the B-phase input terminal of the circuit breaker body 40 via a B-phase input line connecting copper busbar 32. The C-phase interface copper busbar 13 is connected to the C-phase input terminal of the circuit breaker body 40 via a C-phase input line connecting copper busbar 33. The A-phase output terminal of the circuit breaker body 40 is connected to the A-phase output extension copper busbar 51. The B-phase output terminal of the circuit breaker body 40 is connected to the B-phase output extension copper busbar 52. The C-phase output terminal of the circuit breaker body 40 is connected to the C-phase output extension copper busbar 53.

[0022] See Figure 8The A-phase interface copper busbar 11, B-phase interface copper busbar 12, and C-phase interface copper busbar 13 are all U-shaped and pass through the mounting plate 20. One end of each of the three busbars is the incoming line terminal 111, and the other end is the connecting end 112. The incoming line terminal 111 is located on one side of the mounting plate 20, and the connecting end 112 is located on the other side of the mounting plate 20. (See [reference]). Figure 5 and Figure 6 The copper busbars 11 and 13 of phase A and phase C respectively extend out of the mounting plate 20 by the same length. The copper busbar 12 of phase B extends out of the mounting plate 20 by a greater length than the copper busbar 11 of phase A. The connecting ends of copper busbars 11 and 12 of phase A and phase B respectively are the same length, while the connecting end of copper busbar 13 of phase C is longer than the connecting end of copper busbar 11 of phase A. By setting the lengths of copper busbars 11, 12, and 13 of phase A and phase B extending out of the mounting plate 20, as well as the lengths of the connecting ends of the three copper busbars, the copper busbars of phases A, B, and C are staggered, achieving phase isolation.

[0023] See also Figure 6 The A-phase incoming line connecting copper busbar 31, B-phase incoming line connecting copper busbar 32, and C-phase incoming line connecting copper busbar 33 are arranged in parallel and staggered configurations. All three are L-shaped. One end of the A-phase incoming line connecting copper busbar 31 is connected to the connection end 111 of the A-phase interface copper busbar 11, and the other end is connected to the A-phase incoming line terminal of the circuit breaker body 40. One end of the B-phase incoming line connecting copper busbar 32 is connected to the connection end 111 of the B-phase interface copper busbar 12, and the other end is connected to the B-phase incoming line terminal of the circuit breaker body 40. One end of the C-phase incoming line connecting copper busbar 33 is connected to the connection end 111 of the C-phase interface copper busbar 13, and the other end is connected to the C-phase incoming line terminal of the circuit breaker body 40. (See also...) Figure 7 Phase A interface copper busbar 11 and Phase C interface copper busbar 13 are respectively mounted on the first connector 71 through insulating supports. Phase B interface copper busbar 12 is mounted on the second connector 72 through insulating supports. The second connector 72 is mounted on the first connector 71. Phase A incoming line connecting copper busbar 31 and Phase B incoming line connecting copper busbar 32 are fixed together through insulating supports. Phase A incoming line connecting copper busbar 31 is mounted on the third connector 73 through insulating supports. Phase C incoming line connecting copper busbar 33 is mounted on the fourth connector 74 through insulating supports. The first connector 71, the third connector 73, and the fourth connector 74 are all mounted on the mounting part 20.

[0024] See Figure 3There are phase spacers 61 between the A-phase interface copper busbar 11 and the B-phase interface copper busbar 12, between the B-phase interface copper busbar 12 and the C-phase interface copper busbar 13, and between the C-phase interface copper busbar 13 and the edge of the mounting plate 20, which can prevent phase-to-phase short circuits and accidental cable contact.

[0025] The incoming terminals 111 of the A-phase interface copper busbar 11, B-phase interface copper busbar 12, and C-phase interface copper busbar 13 each have one or at least two terminals, with at least two terminals arranged in a stepped configuration. In this embodiment, the incoming terminals 111 of the A-phase interface copper busbar 11, B-phase interface copper busbar 12, and C-phase interface copper busbar 13 each have two terminals. By setting the incoming terminals 111 in a stepped configuration and placing the terminals on each step, the two terminals are arranged in a stepped configuration. When more than two terminals are required, the number of steps in the incoming terminals 111 can be increased. For ease of description, taking the A-phase interface copper busbar 11 as an example, the area between the incoming terminal 111 and the terminal 112 is the middle section, which passes through the mounting plate 20. When the incoming terminal 111 is set in a stepped configuration, the vertical distance between the step and the terminal 112 decreases sequentially from the position where the incoming terminal 111 connects to the middle section to the end of the incoming terminal 111. The stepped configuration of the incoming terminals of the B-phase interface copper busbar 12 and the C-phase interface copper busbar 13 is the same as that of the A-phase interface copper busbar 11. By setting at least two terminals at the incoming terminals 111 of the A-phase interface copper busbar 11, B-phase interface copper busbar 12, and C-phase interface copper busbar 13, when the cable connected to the incoming terminal 111 is thick, the cable is divided into multiple branches, and each branch is connected to a terminal, thereby meeting the wiring requirements of different cable types.

[0026] Insulating baffles 62 are provided at the penetration positions of the A-phase interface copper busbar 11, B-phase interface copper busbar 12, and C-phase interface copper busbar 13 on the mounting plate 20. The middle parts of the A-phase interface copper busbar 11, B-phase interface copper busbar 12, and C-phase interface copper busbar 13 pass through one insulating baffle 62, the mounting plate 20, and another insulating baffle 62 in sequence. Both insulating baffles 62 are installed on the mounting plate 20.

[0027] The circuit breaker body 40 is mounted on the mounting plate 20, and its input terminals 111, which are located on the same side of the mounting plate 20 as the input terminals 111 of the A-phase interface copper busbar 11, the B-phase interface copper busbar 12, and the C-phase interface copper busbar 13. The circuit breaker body 40 has mounting holes, and can be fixedly mounted on the mounting plate 20 using mounting components, which can be bolt assemblies. During installation, the A-phase input terminal, B-phase input terminal, C-phase input terminal, A-phase output terminal, B-phase output terminal, and C-phase output terminal of the circuit breaker body 40 pass through the through holes on the mounting plate 20. Specifically, the A-phase input terminal and the C-phase input terminal are of the same length, the B-phase input terminal is longer than the A-phase input terminal, the A-phase output terminal and the C-phase output terminal are of the same length, the B-phase output terminal is longer than the A-phase output terminal, the A-phase input terminal and the A-phase output terminal are of the same length, and the B-phase input terminal and the B-phase output terminal are of the same length.

[0028] In this embodiment, the A-phase outgoing extension copper busbar 51, B-phase outgoing extension copper busbar 52, and C-phase outgoing extension copper busbar 53 are all straight copper busbars, each with multiple mounting holes. These mounting holes facilitate the parallel connection of multiple cables within the cabinet 100. Cables are connected to the inlet terminals 111 of the A-phase interface copper busbar 11, B-phase interface copper busbar 12, and C-phase interface copper busbar 13. The ends of the A-phase outgoing extension copper busbars 51, B-phase outgoing extension copper busbar 52, and C-phase outgoing extension copper busbar 53 are fixed to the cabinet 100 via insulating supports. Multiple cables within the cabinet 100 are connected in parallel and run through the A-phase outgoing extension copper busbars 51, B-phase outgoing extension copper busbar 52, and C-phase outgoing extension copper busbar 53.

[0029] Combination Figure 12 The circuit breaker extension structure of this utility model connects the A-phase, B-phase, and C-phase incoming terminals of the circuit breaker body 40 to the A-phase interface copper busbar 11, B-phase interface copper busbar 12, and C-phase interface copper busbar 13 respectively via A-phase incoming copper busbar 31, B-phase incoming copper busbar 32, and C-phase incoming copper busbar 33. The A-phase, B-phase, and C-phase outgoing terminals of the circuit breaker body 40 are connected to the cables inside the cabinet via A-phase outgoing extension copper busbar 51, B-phase outgoing extension copper busbar 52, and C-phase outgoing extension copper busbar 53 respectively. By extending the incoming terminals of the circuit breaker body to the side using copper busbars, the following advantages are achieved: First, it reduces the height of the circuit breaker, significantly reducing the cabinet space occupied by the circuit breaker, especially the space in the cabinet height direction, thus increasing the power density of the equipment. Second, it increases the wiring space of the circuit breaker body on the cabinet, increases the wiring height, facilitates on-site wiring construction, and reduces operational difficulty.

[0030] This invention requires no modification to the circuit breaker body; only the copper busbar structure needs to be designed. By adjusting the copper busbar structure, different wiring requirements can be met, resulting in low cost and high flexibility.

[0031] Example 2 The difference between this embodiment and Embodiment 1 is as follows: See Figure 9 In this embodiment, the incoming terminals 111 of the A-phase interface copper busbar 11, B-phase interface copper busbar 12, and C-phase interface copper busbar 13 each have only one terminal, which simplifies the structure of the A-phase interface copper busbar 11, B-phase interface copper busbar 12, and C-phase interface copper busbar 13 and reduces the size of the circuit breaker expansion structure.

[0032] Example 3 The difference between this embodiment and Embodiment 1 is as follows: See Figure 10 and Figure 11 In this embodiment, both phase A-phase outgoing line extension copper busbar 51 and phase C-phase outgoing line extension copper busbar 53 are bent copper busbars, while phase B-phase outgoing line extension copper busbar 52 is a straight copper busbar. The bent portion 511 of phase A-phase outgoing line extension copper busbar 51 is connected to the phase A-phase outgoing line terminal of the circuit breaker body 40, and the bent portion 531 of phase C-phase outgoing line extension copper busbar 53 is connected to the phase C-phase outgoing line terminal of the circuit breaker body 40. By setting phase A-phase outgoing line extension copper busbar 51 and phase C-phase outgoing line extension copper busbar 53 as bent copper busbars in this embodiment, the phase spacing between phase A-phase outgoing line extension copper busbar 51 and phase B-phase outgoing line extension copper busbar 52, and between phase B-phase outgoing line extension copper busbar 52 and phase C-phase outgoing line extension copper busbar 53, is increased, thereby improving safety.

[0033] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A circuit breaker extension structure, characterized in that: include: The A-phase interface copper busbar (11), B-phase interface copper busbar (12), and C-phase interface copper busbar (13) are installed on the mounting plate (20). The A-phase interface copper busbar (11) is connected to the A-phase input terminal of the circuit breaker body (40) through the A-phase input line connecting copper busbar (31). The B-phase interface copper busbar (12) is connected to the B-phase input terminal of the circuit breaker body (40) through the B-phase input line connecting copper busbar (32). The C-phase interface copper busbar (13) is connected to the C-phase input terminal of the circuit breaker body (40) through the C-phase input line connecting copper busbar (33). The A-phase output terminal of the circuit breaker body (40) is connected to the A-phase output extension copper busbar (51). The B-phase output terminal of the circuit breaker body (40) is connected to the B-phase output extension copper busbar (52). The C-phase output terminal of the circuit breaker body (40) is connected to the C-phase output extension copper busbar (53).

2. The circuit breaker extension structure according to claim 1, characterized in that: The A-phase interface copper busbar (11), B-phase interface copper busbar (12), and C-phase interface copper busbar (13) are all U-shaped and pass through the mounting plate (20). The A-phase interface copper busbar (11), B-phase interface copper busbar (12), and C-phase interface copper busbar (13) are located on one side of the mounting plate (20) as the inlet end and on the other side of the mounting plate (20) as the connection end. The A-phase interface copper busbar (11) and C-phase interface copper busbar (13) have the same length extending out of the mounting plate (20). The B-phase interface copper busbar (12) has a longer length extending out of the mounting plate (20) than the A-phase interface copper busbar (11). The A-phase interface copper busbar (11) and B-phase interface copper busbar (12) have the same length connecting end. The C-phase interface copper busbar (13) has a longer length connecting end than the A-phase interface copper busbar (11).

3. The circuit breaker extension structure according to claim 1, characterized in that: There are phase spacers (61) between the A-phase interface copper busbar (11) and the B-phase interface copper busbar (12), between the B-phase interface copper busbar (12) and the C-phase interface copper busbar (13), and between the C-phase interface copper busbar (13) and the edge of the mounting plate (20).

4. The circuit breaker extension structure according to claim 2, characterized in that: The A-phase incoming line connecting copper busbar (31), B-phase incoming line connecting copper busbar (32), and C-phase incoming line connecting copper busbar (33) are arranged in parallel and staggered. One end of the A-phase incoming line connecting copper busbar (31) is connected to the connection end of the A-phase interface copper busbar (11), and the other end of the A-phase incoming line connecting copper busbar (31) is connected to the A-phase incoming line end of the circuit breaker body (40). One end of the B-phase incoming line connecting copper busbar (32) is connected to the connection end of the B-phase interface copper busbar (12), and the other end of the B-phase incoming line connecting copper busbar (32) is connected to the B-phase incoming line end of the circuit breaker body (40). One end of the C-phase incoming line connecting copper busbar (33) is connected to the connection end of the C-phase interface copper busbar (13), and the other end of the C-phase incoming line connecting copper busbar (33) is connected to the C-phase incoming line end of the circuit breaker body (40).

5. The circuit breaker extension structure according to claim 2, characterized in that: The A-phase interface copper busbar (11), B-phase interface copper busbar (12), and C-phase interface copper busbar (13) are provided with insulating baffles (62) at the penetration positions of the mounting plate (20).

6. The circuit breaker extension structure according to claim 1, characterized in that: The incoming terminals of the A-phase interface copper busbar (11), B-phase interface copper busbar (12), and C-phase interface copper busbar (13) have one or at least two terminals, and at least two terminals are arranged in a stepped manner.

7. The circuit breaker extension structure according to claim 1, characterized in that: Multiple mounting holes are provided on the A-phase outgoing line extension copper busbar (51), B-phase outgoing line extension copper busbar (52), and C-phase outgoing line extension copper busbar (53).

8. The circuit breaker extension structure according to claim 1, characterized in that: Both the A-phase outgoing extension copper busbar (51) and the C-phase outgoing extension copper busbar (53) are bent copper busbars, while the B-phase outgoing extension copper busbar (52) is a straight copper busbar. The bent part of the A-phase outgoing extension copper busbar (51) is connected to the A-phase outgoing terminal of the circuit breaker body (40), and the bent part of the C-phase outgoing extension copper busbar (53) is connected to the C-phase outgoing terminal of the circuit breaker body (40).

9. The circuit breaker extension structure according to claim 1, characterized in that: The circuit breaker body (40) is mounted on the mounting plate (20), and the incoming terminals of the A-phase interface copper busbar (11), B-phase interface copper busbar (12), and C-phase interface copper busbar (13) are located on the same side of the mounting plate (20).

10. The circuit breaker extension structure according to claim 1, characterized in that: The incoming ends of the A-phase interface copper busbar (11), B-phase interface copper busbar (12), and C-phase interface copper busbar (13) are respectively connected to cables. The ends of the A-phase outgoing extension copper busbar (51), B-phase outgoing extension copper busbar (52), and C-phase outgoing extension copper busbar (53) are fixed on the cabinet. Multiple cables are connected in parallel on the A-phase outgoing extension copper busbar (51), B-phase outgoing extension copper busbar (52), and C-phase outgoing extension copper busbar (53) inside the cabinet.

Images