Circuit breaker

Abstract

The utility model provides a circuit breaker, and relates to the technical field of electrical equipment. The circuit breaker comprises a first branch, a second branch, a main loop, a branch switch, a first isolation switch, an external circuit and a second isolation switch. The first branch circuit and the second branch circuit are arranged in the main loop in parallel, the branch circuit switch is arranged on the first branch circuit, the second branch circuit is provided with a power electronic branch circuit and an energy absorption branch circuit which are connected in parallel, and the first isolation switch is arranged on the second branch circuit and used for connecting or disconnecting the power electronic branch circuit and the energy absorption branch circuit at the same time; one end of the external circuit is connected with a power supply end, the other end is connected with a load end, and the external circuit is connected with the main loop; and the second isolation switch is arranged on the external circuit and is used for connecting or disconnecting the external circuit, so that the connection or disconnection of the whole circuit is realized through the second isolation switch, and the circuit breaker adapts to the application scene of high-voltage breaking, thereby further improving the breaking capacity and safety performance of the circuit breaker.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical equipment technical field, specifically, relate to a low voltage circuit breaker. BACKGROUND

[0002] The circuit breaker is an indispensable important component in the modern electrical system, which can not only effectively protect the circuit and equipment from the hazards of overload, short circuit and grounding fault, but also provide convenient breaking function.

[0003] However, the existing circuit breaker cannot provide a reliable power-off signal when the mechanical branch is disconnected, especially in hybrid solid-state circuit breakers. Therefore, an improved scheme is needed to ensure safe and reliable circuit interruption under various operating conditions, especially in high-voltage environments. SUMMARY

[0004] The utility model aims at providing a circuit breaker which can effectively ensure the connection and disconnection of the line.

[0005] The embodiment of the utility model is realized as follows:

[0006] In a first aspect, the utility model provides a circuit breaker, comprising a first branch, a second branch, a main circuit, a branch switch, a first disconnecting switch, an external circuit and a second disconnecting switch:

[0007] The first branch and the second branch are connected in parallel to the main circuit, the branch switch is arranged in the first branch, the second branch is provided with a parallel power electronic branch and an energy absorption branch, the first disconnecting switch is arranged in the second branch for simultaneously connecting or disconnecting the power electronic branch and the energy absorption branch;

[0008] One end of the external circuit is used to connect with the power supply end, and the other end is used to connect with the load end, and the external circuit is connected with the main circuit;

[0009] The second disconnecting switch is arranged in the external circuit for connecting or disconnecting the external circuit.

[0010] In an optional embodiment, the external circuit comprises a positive line and a negative line, and both ends of the positive line and the negative line are used to connect with the power supply end and the load end respectively to form a loop;

[0011] The circuit breaker comprises two branches, each branch comprises the first branch, the second branch, the main circuit, the branch switch and the first disconnecting switch, the main circuit of one branch is connected with the positive line, and the main circuit of the other branch is connected with the negative line.

[0012] In an optional embodiment, the second disconnector is arranged on the positive electrode line, and the second disconnector is located between the power supply end and one of the branches.

[0013] In an optional embodiment, the second disconnector is arranged on the negative electrode line, and the second disconnector is located between the power supply end and the other branch.

[0014] In an optional embodiment, the second disconnector is arranged on the positive electrode line, and the second disconnector is located between the load end and one of the branches.

[0015] In an optional embodiment, the second disconnector is arranged on the negative electrode line, and the second disconnector is located between the load end and the other branch.

[0016] In an optional embodiment, the first disconnector and the second disconnector are of the same structure, and each includes a housing, a static contact, and a dynamic contact.

[0017] The static contact is arranged in the housing, and the static contact is provided with a first contact portion and a second contact portion. The dynamic contact is movably arranged in the housing, and the dynamic contact includes a main contact and an arc contact. The main contact is used for contacting the first contact portion, and the arc contact is used for contacting the second contact portion. During the opening process of the dynamic contact and the static contact, and after the main contact is separated from the first contact portion, the arc contact is separated from the second contact portion.

[0018] In an optional embodiment, the housing is provided with a rotating shaft, and the main contact and the arc contact are rotatably arranged on the rotating shaft. The length of the arc contact is greater than the length of the main contact. The main contact and the arc contact are arranged in the axial direction of the rotating shaft, and the main contact and the arc contact are integrally formed.

[0019] In an optional embodiment, the number of the dynamic contact and the static contact is two, and the two static contacts are centrally symmetrically arranged about the rotating shaft. The number of the main contact and the arc contact is also two, and the two main contacts and the two arc contacts are respectively located on both sides of the rotating shaft. The two dynamic contacts located on both sides of the rotating shaft are insulated from each other.

[0020] In an optional embodiment, the disconnector further comprises two connecting pieces, both of which are arranged in the shell and connected with one end of the moving contact away from the corresponding static contact through wires respectively, one of the connecting pieces is used together with one of the static contacts to connect with a positive line, and the other connecting piece is used together with the other static contact to connect with a negative line.

[0021] The circuit breaker has the advantages that the first disconnector is arranged in the circuit breaker, i.e., the first disconnector is arranged in the second branch provided with the power electronic branch and the energy absorption branch in parallel, so that the power electronic branch and the energy absorption branch are connected or disconnected through the first disconnector, the state of the two branches is indicated through the explicit contact, and the line safety is ensured; the second disconnector is arranged outside the circuit breaker, i.e., the second disconnector is arranged in the external line, so that the connection or disconnection of the entire line is realized through the second disconnector, the application scene of high-voltage breaking is adapted, and the breaking capacity and safety performance of the circuit breaker are further improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiments, it should be understood, the following drawings only shows some embodiments of the utility model, therefore should not be regarded as the limitation to the range, for the ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other related drawings according to these drawings.

[0023] Figure 1 The utility model embodiment provides a circuit breaker structure schematic diagram one;

[0024] Figure 2 The utility model embodiment provides a circuit breaker structure schematic diagram two;

[0025] Figure 3 The utility model embodiment provides a circuit breaker structure schematic diagram three;

[0026] Figure 4 The utility model embodiment provides a disconnector structure schematic diagram;

[0027] Figure 5 The utility model embodiment provides a disconnector partial structure schematic diagram one;

[0028] Figure 6 The utility model embodiment provides a disconnector partial structure schematic diagram two;

[0029] Figure 7The isolating switch positive electrode line schematic diagram provided by the utility model provides an embodiment of the utility model.

[0030] Figure 8 The isolating switch negative electrode line schematic diagram provided by the utility model provides an embodiment of the utility model.

[0031] Figure 9 The isolating switch partial structure schematic diagram three provided by the utility model provides an embodiment of the utility model.

[0032] Figure 10 The isolating switch another embodiment structure schematic diagram provided by the utility model provides an embodiment of the utility model.

[0033] Icon: 10-circuit breaker; 100-isolating switch; 101-first isolating switch; 102-second isolating switch; 110-housing; 111-rotating shaft; 120-static contact; 121-first contact part; 122-second contact part; 130-moving contact; 131-main contact; 132-arc contact; 140-wiring part; 150-wire; 160-arc extinguishing chamber; 161-arc extinguishing sheet; 162-groove; 163-arc extinguishing channel; 170-insulating part; 171-insulating channel; 200-first branch; 300-second branch; 310-power electronic branch; 320-energy absorption branch; 400-main loop; 500-branch switch; 600-external circuit; 610-positive electrode line; 620-negative electrode line; 11-power supply end; 12-load end. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the utility model.

[0036] It should be noted that: similar labels and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] In the description of the utility model, it needs to be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0038] In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0039] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0040] The circuit breaker is an important component indispensable in modern electrical systems, which not only effectively protects the circuit and equipment from overload, short circuit and grounding faults, but also provides convenient breaking function.

[0041] However, the existing circuit breaker cannot provide a reliable power-off signal when the mechanical branch is disconnected, especially in hybrid solid-state circuit breakers. Therefore, an improved scheme is urgently needed to ensure safe and reliable circuit interruption under various working conditions, especially in high-voltage environments.

[0042] Based on the problems in the prior art, please refer to Figure 1 The utility model embodiment provides a circuit breaker 10, especially for electrical equipment such as hybrid solid-state circuit breaker 10, which can effectively ensure the connection and disconnection of the line.

[0043] In detail, it should first be noted that the circuit breaker 10 also includes a disconnecting switch 100, which includes a first disconnecting switch 101 and a second disconnecting switch 102. In addition, the circuit breaker 10 also includes a first branch 200, a second branch 300, a main circuit 400, a branch switch 500, and an external connection line 600.

[0044] The first branch 200 and the second branch 300 are connected in parallel in the main circuit 400. The branch switch 500 is located in the first branch 200. The second branch 300 is provided with a power electronic branch 310 and an energy absorption branch 320 connected in parallel. The first disconnecting switch 101 is located in the second branch 300 and is used to connect or disconnect the power electronic branch 310 and the energy absorption branch 320 at the same time.

[0045] Therefore, the first disconnecting switch 101 is built into the circuit breaker 10. That is, the first disconnecting switch 101 is installed in the second branch 300, which is provided with the power electronic branch 310 and the energy absorption branch 320 in parallel. In this way, the first disconnecting switch 101 can clearly indicate whether the power electronic branch 310 and the energy absorption branch 320 are connected or disconnected, thereby indicating the status of the two branches through clear contacts, thus ensuring the safety of the line.

[0046] It is worth mentioning that the first branch 200 is a mechanical branch that carries the rated current and the fault current in the initial stage, the power electronic branch 310 is a fault current commutation path and a branch that interrupts the fault current, and the energy absorption branch 320 is a branch that absorbs fault energy.

[0047] One end of the external line 600 is used to connect to the power supply terminal 11, and the other end is used to connect to the load terminal 12. The external line 600 is connected to the main circuit 400 to form a circuit. The second disconnecting switch 102 is set on the external line 600 to connect or disconnect the external line 600.

[0048] Therefore, by placing the second disconnecting switch 102 externally in the circuit breaker 10, that is, by setting the second disconnecting switch 102 in the external line 600, the entire line can be connected or disconnected through the second disconnecting switch 102, thereby adapting to the application scenario of high voltage disconnection, and thus further improving the breaking capacity and safety performance of the circuit breaker 10.

[0049] Furthermore, such as Figure 1 As shown, the external line 600 includes a positive line 610 and a negative line 620. The two ends of the positive line 610 and the negative line 620 are respectively used to connect to the power supply terminal 11 and the load terminal 12 to form a circuit.

[0050] The circuit breaker 10 comprises two branches, each of which comprises a first branch 200, a second branch 300, a main circuit 400, a branch switch 500 and a first isolating switch 101, wherein the main circuit 400 of one branch is connected with the positive line 610, and the main circuit 400 of the other branch is connected with the negative line 620.

[0051] In other words, one end of one branch is connected with the positive pole of the power supply end 11 through the positive line 610, and the other end is connected with the positive pole of the load end 12 through the positive line 610; one end of the other branch is connected with the negative pole of the power supply end 11 through the negative line 620, and the other end is connected with the negative pole of the load end 12 through the negative line 620, thereby forming a loop.

[0052] Optionally, as shown in the figure, Figure 1 the second isolating switch 102 can be arranged on the positive line 610 and the negative line 620 at the same time, so that the branch switch 500, the first isolating switch 101 and the second isolating switch 102 have three breaking points on the positive line 610 or the negative line 620 at the same time, thereby ensuring the breaking capacity of the circuit breaker 10.

[0053] Of course, not only that, in other embodiments of the utility model, Figure 2 as shown in the figure, the second isolating switch 102 can also be arranged on the positive line 610 or the negative line 620.

[0054] For example, the second isolating switch 102 is arranged on the positive line 610, and the second isolating switch 102 is located between the power supply end 11 and one branch of the circuit breaker 10.

[0055] Or, the second isolating switch 102 is arranged on the negative line 620, and the second isolating switch 102 is located between the power supply end 11 and the other branch of the circuit breaker 10.

[0056] In addition, in other embodiments of the utility model, the second isolating switch 102 can also be arranged on the positive line 610, and the second isolating switch 102 is located between the load end 12 and one branch of the circuit breaker 10.

[0057] Or, the second isolating switch 102 can also be arranged on the negative line 620, and the second isolating switch 102 is located between the load end 12 and the other branch of the circuit breaker 10.

[0058] In addition, in other embodiments of the utility model, Figure 3 as shown in the figure, the external isolating switch 100 can also not be arranged, that is, the second isolating switch 102 is not arranged. According to the actual application requirement, the corresponding adjustment can be made, which is not limited here.

[0059] Further, please refer to Figure 4 to Figure 6 The first disconnector 101 and the second disconnector 102 are the same in structure, and each includes a housing 110, a static contact 120, and a dynamic contact 130.

[0060] The static contact 120 is arranged on the housing 110, and the static contact 120 is provided with a first contact part 121 and a second contact part 122. The dynamic contact 130 is movably arranged on the housing 110, and the dynamic contact 130 includes a main contact 131 and an arc contact 132. The main contact 131 is used to contact the first contact part 121, and the arc contact 132 is used to contact the second contact part 122. In the process of disconnecting the dynamic contact 130 from the static contact 120, and after the main contact 131 is separated from the first contact part 121, the arc contact 132 is separated from the second contact part 122.

[0061] In this embodiment, by arranging one main contact 131 and one arc contact 132 on the dynamic contact 130, when closing, the main contact 131 is contacted after the first contact part 121 of the static contact 120, and the arc contact 132 is contacted first with the second contact part 122 of the static contact 120, so as to realize that the main contact 131 and the arc contact 132 jointly bear the current in the circuit. Not only can the short-time withstand capability be improved, but also the use scene of high voltage can be adapted, so as to improve the adaptability of the disconnector 100. Furthermore, in the process of disconnecting, the arc contact 132 is disconnected from the static contact 120 after the main contact 131 is disconnected from the static contact 120, so that the electric arc appears on the arc contact 132 and is extinguished. Not only the main contact 131 is protected, but also the breaking capacity of the disconnector 100 is effectively improved, so as to improve the use stability and service life of the disconnector 100.

[0062] It is worth mentioning that the dynamic contact 130 can be slidably arranged on the housing 110, or can be rotatably arranged on the housing 110, which can be determined according to the actual product demand, and is not specifically limited here.

[0063] In this embodiment, the structure of the flip-type dynamic contact 130 is described.

[0064] In detail, the housing 110 is provided with a rotating shaft 111, and the main contact 131 and the arc contact 132 are rotatably arranged on the rotating shaft 111. The length of the arc contact 132 is greater than the length of the main contact 131.

[0065] Because the length of the arc contact 132 is greater than the length of the main contact 131, in the process of disconnecting the dynamic contact 130 from the static contact 120, the “overtravel” of the arc contact 132 is greater than the “overtravel” of the main contact 131, so that the arc contact 132 is disconnected from the static contact 120 after the main contact 131 is disconnected from the static contact 120, so that the electric arc appears on the arc contact 132 and is finally extinguished.

[0066] Further, the number of the static contacts 120 is two, and the two static contacts 120 are centrally symmetric about the rotation shaft 111. The number of the main contacts 131 and the arc contacts 132 is also two, and the two main contacts 131 and the two arc contacts 132 are respectively located on the two sides of the rotation shaft 111.

[0067] It is worth mentioning that the moving contacts 130 located on the two sides of the rotation shaft 111 are insulated from each other.

[0068] It can be understood that, since the two main contacts 131 and the two arc contacts 132 respectively correspond to the first contact part 121 and the second contact part 122 of the static contact 120, the two main contacts 131 are also centrally symmetric about the rotation shaft 111, and the two arc contacts 132 are also centrally symmetric about the rotation shaft 111.

[0069] Further, the disconnector 100 further comprises two wiring pieces 140, and the two wiring pieces 140 are respectively arranged in the shell 110 and connected to one end of the moving contact 130 away from the corresponding static contact 120 through the flexible connection wire 150. One of the wiring pieces 140 is used together with one of the static contacts 120 to connect to the positive line 610, and the other of the wiring pieces 140 is used together with the other of the static contacts 120 to connect to the negative line 620.

[0070] In the embodiment, as shown in Figure 7 , the disconnector 100 forms a positive circuit through one of the static contacts 120, the moving contact 130, the flexible connection wire 150, and one of the wiring pieces 140; as shown in Figure 8 , the disconnector 100 further forms a negative circuit through the other of the static contacts 120, the moving contact 130, the flexible connection wire 150, and the other of the wiring pieces 140.

[0071] Therefore, when the moving contact 130 contacts the static contact 120, the positive line 610 and the negative line 620 are simultaneously connected; and when the moving contact 130 is separated from the static contact 120, the positive line 610 and the negative line 620 are simultaneously disconnected.

[0072] Further, please continue to refer to Figure 4 , Figure 5 and Figure 9 , the disconnector 100 further comprises an arc extinguishing chamber 160, and the arc extinguishing chamber 160 is arranged in the shell 110 and located at one end of the arc contact 132.

[0073] In the embodiment, in order to further improve the arc extinguishing capability of the isolator 100, an arc extinguishing chamber 160 is arranged in the housing 110 and at the end of the arc contact 132, so that the arc can be introduced into the arc extinguishing chamber 160 and extinguished quickly after the arc is generated at the arc contact 132.

[0074] In detail, the arc extinguishing chamber 160 comprises a plurality of arc extinguishing pieces 161, the plurality of arc extinguishing pieces 161 are arranged at intervals, and each of the plurality of arc extinguishing pieces 161 is provided with a groove 162 to form an arc extinguishing channel 163, and the movement path of the arc contact 132 is located in the arc extinguishing channel 163.

[0075] In the embodiment, by arranging the grooves 162 on the side of the plurality of arc extinguishing pieces 161 facing the arc contact 132, and making the plurality of grooves 162 form a relatively narrow arc extinguishing channel 163, the arc contact 132 moves in the arc extinguishing channel 163 during closing or opening, so that the generated arc is affected by the narrow arc extinguishing channel 163, that is, even if the electromagnetic attraction of small current is not strong, the arc will also quickly enter the arc extinguishing chamber 160, thereby solving the arc extinguishing problem of the critical current of the small current circuit.

[0076] Further, the isolator 100 further comprises two insulation pieces 170, the two insulation pieces 170 are arranged on both sides of the movement path of the arc contact 132 to form an insulation channel 171, and the end of each of the two insulation pieces 170 is embedded in the arc extinguishing channel 163.

[0077] In the embodiment, the insulation piece 170 is in the form of a sheet, and the two insulation pieces 170 are arranged in parallel; by arranging the two insulation pieces 170 on both sides of the arc contact 132 to form a narrow insulation channel 171, the arc extinguishing capability is further improved.

[0078] It is worth mentioning that, since the isolator 100 usually needs a certain current carrying cross section to carry current, the arc contact 132 alone is insufficient to carry the current in all application scenarios, and may also cause problems such as excessive temperature of the arc contact 132, therefore, a main contact 131 is arranged on one side of the arc contact 132, the main contact 131 and the arc contact 132 jointly carry current, so as to adapt to more use scenarios, thereby improving the adaptability of the isolator 100.

[0079] Further, the main contact 131 and the arc contact 132 are arranged at intervals along the axial direction of the rotating shaft 111, in other words, the main contact 131 and the arc contact 132 can be two independent structures connected together, of course, in other embodiments of the utility model, as shown in FIG. 2, Figure 10 the main contact 131 and the arc contact 132 are in an integral molding structure, which is simple in process and low in cost, can reduce the equipment process, and improve the structural strength.

[0080] In summary, the utility model provides a circuit breaker 10, with first disconnecting switch 101 is built into the inside of circuit breaker 10, namely with first disconnecting switch 101 is arranged in parallel with power electronic branch 310 and energy absorption branch 320 second branch 300 sets up, by first disconnecting switch 101 can make power electronic branch 310 and energy absorption branch 320 connect or disconnect definitely, to make the state of two branches by definite contact indication, to guarantee the line safety, by with second disconnecting switch 102 is external to circuit breaker 10, namely with second disconnecting switch 102 is arranged in external line 600, to realize the connection or disconnection of whole line by second disconnecting switch 102, and to adapt the application scene of high voltage breaking, to further improve the breaking capacity and safety performance of circuit breaker 10.

[0081] The above only for the preferred embodiment of the utility model has, and does not for limiting the utility model, for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A circuit breaker, characterized in that, Including the first branch (200), the second branch (300), the main circuit (400), the branch switch (500), the first disconnecting switch (101), the external line (600), and the second disconnecting switch (102): The first branch (200) and the second branch (300) are connected in parallel in the main circuit (400). The branch switch (500) is located in the first branch (200). The second branch (300) is provided with a power electronic branch (310) and an energy absorption branch (320) connected in parallel. The first disconnecting switch (101) is located in the second branch (300) and is used to simultaneously connect or disconnect the power electronic branch (310) and the energy absorption branch (320). One end of the external line (600) is used to connect to the power supply terminal (11), and the other end is used to connect to the load terminal (12). The external line (600) is connected to the main circuit (400). The second disconnecting switch (102) is disposed on the external line (600) and is used to connect or disconnect the external line (600).

2. The circuit breaker according to claim 1, characterized in that, The external line (600) includes a positive line (610) and a negative line (620). The two ends of the positive line (610) and the negative line (620) are respectively used to connect to the power supply terminal (11) and the load terminal (12) to form a circuit. The circuit breaker includes two branches, each branch including a first branch (200), a second branch (300), a main circuit (400), a branch switch (500), and a first disconnecting switch (101). The main circuit (400) of one branch is connected to the positive line (610), and the main circuit (400) of the other branch is connected to the negative line (620).

3. The circuit breaker according to claim 2, characterized in that, The second disconnect switch (102) is disposed on the positive line (610), and the second disconnect switch (102) is located between the power supply terminal (11) and one of the branches.

4. The circuit breaker according to claim 2 or 3, characterized in that, The second disconnect switch (102) is disposed on the negative line (620), and the second disconnect switch (102) is located between the power supply terminal (11) and another branch.

5. The circuit breaker according to claim 2, characterized in that, The second disconnecting switch (102) is disposed on the positive line (610), and the second disconnecting switch (102) is located between the load end (12) and one of the branches.

6. The circuit breaker according to claim 2 or 5, characterized in that, The second disconnect switch (102) is disposed on the negative line (620), and the second disconnect switch (102) is located between the load end (12) and another branch.

7. The circuit breaker according to claim 1, characterized in that, The first disconnect switch (101) and the second disconnect switch (102) have the same structure, and both include a housing (110), a stationary contact (120) and a moving contact (130); The stationary contact (120) is disposed in the housing (110), and the stationary contact (120) is provided with a first contact portion (121) and a second contact portion (122); the moving contact (130) is movably disposed in the housing (110), and the moving contact (130) includes a main contact (131) and an arc contact (132). The main contact (131) is used to make subsequent contact with the first contact portion (121), and the arc contact (132) is used to make initial contact with the second contact portion (122); during the opening process of the moving contact (130) and the stationary contact (120), and after the main contact (131) separates from the first contact portion (121), the arc contact (132) separates from the second contact portion (122).

8. The circuit breaker according to claim 7, characterized in that, The housing (110) is provided with a rotating shaft (111), and the main contact (131) and the arc contact (132) are rotatably disposed on the rotating shaft (111). The length of the arc contact (132) is greater than the length of the main contact (131). The main contact (131) and the arc contact (132) are spaced apart along the axial direction of the rotating shaft (111), and the main contact (131) and the arc contact (132) are integrally formed.

9. The circuit breaker according to claim 8, characterized in that, There are two moving contacts (130) and two stationary contacts (120). The two stationary contacts (120) are arranged symmetrically about the rotating shaft (111). There are also two main contacts (131) and two arc contacts (132). The two main contacts (131) and the two arc contacts (132) are located on both sides of the rotating shaft (111). The two moving contacts (130) located on both sides of the rotating shaft (111) are insulated from each other.

10. The circuit breaker according to claim 9, characterized in that, The disconnect switch (100) further includes two connectors (140). Both connectors (140) are disposed in the housing (110) and are connected to the end of a moving contact (130) away from the corresponding stationary contact (120) via wires (150). One connector (140) and one stationary contact (120) are used together to connect to the positive line (610), and the other connector (140) and the other stationary contact (120) are used together to connect to the negative line (620).

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