Circuit breaker

Abstract

The invention belongs to the technical field of circuit breakers, and discloses a circuit breaker which comprises a shell, a traction rod, an arc extinguish chamber and a tripping driving part, the traction rod, the arc extinguish chamber and the tripping driving part are arranged in the shell, the tripping driving part comprises a movable plug and a driving rod, an air hole is formed in the arc extinguish chamber, and the first end of the driving rod is connected with the movable plug; the second end of the driving rod is arranged corresponding to the tripping part of the traction rod, gas generated in the arc extinguish chamber is exhausted through the gas hole and used for pushing the movable plug to move, and the movable plug is configured to drive the driving rod to move and press the tripping part downwards so as to drive the traction rod to be tripped. The circuit breaker provided by the invention is simple in structure, high in breaking efficiency and quick in response, and realizes quick tripping in a pneumatic mode.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a circuit breaker. Background Art

[0002] Circuit breakers are widely used in industry, agriculture, transportation, mining, construction, national defense and other fields. They have multiple protection functions such as overload, short circuit, undervoltage protection, adjustable action value, high breaking capacity, convenience and safety. They are very widely used products in low-voltage electrical appliances.

[0003] In the prior art, the tripping mechanism of the circuit breaker is generally set to be mechanical, which causes a certain delay in the tripping action and cannot meet the use requirements of rapid tripping, thereby affecting the disconnection response efficiency in the event of an accident. Summary of the invention

[0004] The object of the present invention is to provide a circuit breaker with a simple structure, which can achieve rapid tripping by pneumatic means, has high breaking efficiency and quick response.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A circuit breaker comprises a housing, a traction rod, an arc extinguishing chamber and a tripping drive member arranged in the housing; wherein:

[0007] The tripping driving member includes a movable plug and a driving rod, the arc extinguishing chamber is provided with an air hole, the first end of the driving rod is connected to the movable plug, and the second end of the driving rod is arranged corresponding to the tripping portion of the traction rod;

[0008] The gas generated in the arc extinguishing chamber is discharged through the gas hole to push the movable plug to move. The movable plug is configured to drive the driving rod to move and press down the tripping part to drive the traction rod to trip.

[0009] Preferably, the tripping drive member further comprises an elastic member, a first end of the elastic member is connected to the housing, a second end of the elastic member is connected to the movable plug, and the elastic member is used to drive the movable plug to reset.

[0010] Preferably, the elastic member is configured as a spring.

[0011] Preferably, the movable plug is provided with a plug hole, and the first end of the driving rod is fixedly inserted into the plug hole.

[0012] Preferably, the shell has a slide groove, the movable plug is located in the slide groove, the air hole is connected to the slide groove, and the gas generated in the arc extinguishing chamber is discharged through the air hole to push the movable plug to slide relative to the slide groove, so that the driving rod moves and presses down the tripping part.

[0013] Preferably, the movable plug is hingedly arranged on the shell, and the gas generated in the arc extinguishing chamber is discharged through the air hole to push the movable plug to swing upward on the side away from the tripping part, and the movable plug is swung downward toward the side of the tripping part so that the driving rod presses down the tripping part.

[0014] Preferably, the device further comprises a second electrical connector and a current transformer, wherein the second electrical connector comprises a plurality of conductive members, the plurality of conductive members are arranged at intervals along a first direction, the conductive member comprises a first conductive portion extending along a second direction, the current transformer is provided with a plurality of conductive members corresponding to the first conductive portions one by one, the current transformer is sleeved on the corresponding first conductive portion of the conductive member, and the axial direction of the current transformer is parallel to the second direction;

[0015] The first direction is perpendicular to the second direction.

[0016] Preferably, a zero-sequence mutual inductor is further included, wherein the conductive member includes a second conductive portion extending along a third direction, the second conductive portion is connected to the first conductive portion, the zero-sequence mutual inductor is sleeved on a plurality of the second conductive portions, and the axial direction of the zero-sequence mutual inductor is parallel to the third direction;

[0017] The first direction, the second direction and the third direction are arranged orthogonally in pairs.

[0018] Preferably, a third conductive part is connected between the first conductive part and the second conductive part, and the zero-sequence mutual inductor is supported on a plurality of the third conductive parts.

[0019] Preferably, one end of the second conductive portion facing away from the first conductive portion is connected to a conductive connection terminal extending out of the housing.

[0020] Beneficial effects:

[0021] The circuit breaker provided by the present invention is provided with a tripping drive, which includes a movable plug and a driving rod, wherein the driving rod is connected to the movable plug and its end corresponds to the tripping portion of the traction rod. When a fault occurs in the circuit to which the circuit breaker is connected, extremely high arc voltage and arc energy will appear, causing the internal metal material to evaporate, break down and melt, forming a high temperature and strong arc, and these reactions will decompose the oxygen in the air into nitrogen and oxygen, wherein the oxygen reacts chemically with the metal on the surface of the material to produce gas and release energy. A large amount of gas is generated in the arc extinguishing chamber and discharged through the pores, pushing the movable plug to move relative to the housing, thereby driving the driving rod to move and press down the tripping portion, and then driving the traction rod to trip, completing the tripping work. The above process quickly realizes the tripping action of the circuit breaker by pneumatic means, effectively ensuring the breaking efficiency, and can achieve rapid tripping and quick response. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a circuit breaker provided by the present invention;

[0023] Figure 2 It is a partial structural schematic diagram of the circuit breaker provided by the present invention from one perspective;

[0024] Figure 3 is a partial structural schematic diagram of the circuit breaker provided by the present invention from another viewing angle;

[0025] Figure 4 is a structural cross-sectional view of a circuit breaker provided by the present invention;

[0026] Figure 5 is a partial structural cross-sectional view of a circuit breaker provided by the present invention;

[0027] Figure 6 It is a structural schematic diagram of the operating mechanism part of the circuit breaker provided by the present invention;

[0028] Figure 7 is a cross-sectional schematic diagram of the action of the tripping driving member provided by the present invention;

[0029] Figure 8 is a structural cross-sectional view of a circuit breaker provided by another embodiment of the present invention;

[0030] Fig. 9 is a partial structural cross-sectional view of a circuit breaker provided by another embodiment of the present invention;

[0031] Fig.10 is a cross-sectional schematic diagram of the action of a tripping driving member provided by another embodiment of the present invention;

[0032] Fig.11 It is a schematic diagram of the internal structure of the circuit breaker provided by the present invention;

[0033] Fig.12 It is a schematic diagram of the explosion of the internal structure of the circuit breaker provided by the present invention.

[0034] In the figure:

[0035] 1. housing; 101. slideway;

[0036] 2. a first electrical connector;

[0037] 3. second electrical connection member; 31. conductive member; 311. first conductive portion; 312. second conductive portion; 313. third conductive portion; 314. conductive connection terminal;

[0038] 4. traction rod; 41. release part; 411. driving plate; 412. abutment part; 42. trip buckle; 43. lock buckle; 431. avoidance groove;

[0039] 5. Arc extinguishing chamber; 51. Air hole;

[0040] 6. Tripping drive member; 61. Movable plug; 611. Socket; 62. Driving rod; 621. Driving head; 63. Elastic member;

[0041] 7. Current transformer;

[0042] 8. Zero sequence transformer. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0044] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0046] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0047] This embodiment provides a circuit breaker. Figures 1 to 12As shown, the circuit breaker includes a housing 1, a traction rod 4, an arc extinguishing chamber 5 and a tripping drive 6 arranged in the housing 1. The tripping drive 6 includes a movable plug 61 and a driving rod 62. The arc extinguishing chamber 5 is provided with an air hole 51. The first end of the driving rod 62 is connected to the movable plug 61. The second end of the driving rod 62 is arranged corresponding to the tripping portion 41 of the traction rod 4. The gas generated in the arc extinguishing chamber 5 is discharged through the air hole 51 to push the movable plug 61 to move. The movable plug 61 is configured to drive the driving rod 62 to move and press down the tripping portion 41 to drive the traction rod 4 to trip.

[0048] Specifically, the circuit breaker also includes a first electrical connector 2 and a second electrical connector 3 arranged in the shell 1, and the first electrical connector 2 and the second electrical connector 3 are respectively used to connect external electrical equipment and a power source. The traction rod 4 is tripped to cut off the electrical conduction between the first electrical connector 2 and the second electrical connector 3.

[0049] In this embodiment, the driving rod 62 is connected to the movable plug 61 and its end corresponds to the tripping portion 41 of the traction rod 4. When a fault occurs in the circuit to which the circuit breaker is connected, extremely high arc voltage and arc energy will appear, causing the internal metal material to evaporate, break down and melt, forming a high temperature and strong arc. These reactions will decompose the oxygen in the air into nitrogen and oxygen, in which the oxygen reacts chemically with the metal on the surface of the material to produce gas and release energy. A large amount of gas is generated in the arc extinguishing chamber 5 and discharged through the air hole 51, pushing the movable plug 61 to move relative to the housing 1, thereby driving the driving rod 62 to move and press down the tripping portion 41, and then driving the traction rod 4 to trip, cutting off the electrical conduction between the first electrical connector 2 and the second electrical connector 3, and completing the tripping work. The above process quickly realizes the tripping action of the circuit breaker by pneumatic means, effectively ensuring the breaking efficiency, and can achieve rapid tripping and rapid response.

[0050] Specifically, the operating mechanism further includes a base frame (not shown), a trip button 42, a lock button 43, a moving contact (not shown) and a stationary contact (not shown). The base frame is fixed in the housing 1, the trip button 42 and the lock button 43 are respectively hingedly arranged on the base frame, the lock button 43 is provided with an avoidance groove 431, and the release part 41 is correspondingly provided with an abutment part 412, and an elastic reset member (not shown) is provided between the lock button 43 and the base frame, and the elastic reset member is used to make the lock button 43 always have a tendency to swing toward the side of the release part 41. When the driving rod 62 moves and presses down the tripping part 41, the traction rod 4 swings as a whole, and the lock buckle 43 always has a tendency to swing toward the side of the tripping part 41 under the action of the elastic reset member. During the process, the abutment part 412 can enter the avoidance hole, and the lock buckle 43 swings and disengages from the trip buckle 42 to realize the switching of the traction rod 4 from the re-locking position to the tripping position. At this time, the circuit breaker is in the tripping state, and the trip buckle 42 is unlocked and in a free state, so that the moving contact and the static contact are separated. When the external force drives the trip buckle 42 to swing, the trip buckle 42 drives the lock buckle 43 to swing in the opposite direction. During the process, the abutment part 412 moves out of the avoidance hole, and the traction rod 4 swings in the opposite direction as a whole, so that the abutment part 412 abuts on the surface of the lock buckle 43 after moving out of the avoidance hole, thereby realizing the switching of the traction rod 4 from the tripping position to the re-locking position. At this time, the circuit breaker is in the re-locking state, and the trip buckle 42 and the lock buckle 43 overlap and cooperate with each other to lock the trip buckle 42, and the circuit breaker can normally perform closing and opening operations.

[0051] Optionally, the driving rod 62 is configured as a copper screw rod. One end of the driving rod 62 facing the release portion 41 is configured to be tilted downward in the direction of the release portion 41, so that it is easier for the driving rod 62 to contact the release portion 41.

[0052] In this embodiment, the tripping driving member 6 further includes an elastic member 63, a first end of the elastic member 63 is connected to the housing 1, a second end of the elastic member 63 is connected to the movable plug 61, and the elastic member 63 is used to drive the movable plug 61 to return to the air hole 51. Specifically, when the air in the air hole 51 is exhausted, the elastic member 63 can drive the movable plug 61 to move in the reverse direction and return to its original position.

[0053] In this embodiment, the elastic member 63 is configured as a spring. Specifically, when a large amount of gas is generated in the arc extinguishing chamber 5 and discharged through the air hole 51 to push the movable plug 61 to move relative to the housing 1, the spring is stretched and generates elastic force, and when the gas in the air hole 1 is exhausted, the spring retracts under the action of the elastic force, driving the movable plug 61 to move in the opposite direction and reset.

[0054] Specifically in this embodiment, the movable plug 61 is provided with a plug hole 611, and the first end of the driving rod 62 is fixedly plugged into the plug hole 611. The plug-in connection is simple, reliable, and easy to disassemble. In addition to being set as a plug-in connection, the movable plug 61 and the driving rod 62 can also be connected by external connecting parts such as screws, which will not be limited here.

[0055] In this embodiment, the housing 1 has a slide groove 101, the movable plug 61 is located in the slide groove 101, and the air hole 51 is connected to the slide groove 101. The gas generated in the arc extinguishing chamber 5 is discharged through the air hole 51 to push the movable plug 61 to slide relative to the slide groove 101, so that the driving rod 62 moves and presses down the tripping part 41.

[0056] Corresponding to the accompanying drawings, there are a first direction, a second direction and a third direction, and the first direction, the second direction and the third direction are orthogonal to each other. In this embodiment, the first direction is the width direction of the circuit breaker, the second direction is the length direction of the circuit breaker, and the third direction is the height direction of the circuit breaker.

[0057] As an optional implementation, refer to Figures 2 to 7 As shown, the slide groove 101 is opened along the third direction, and the movable plug 61 slides in the slide groove 101. The elastic member 63 is also arranged in the slide groove 101, and one end of the elastic member 63 is connected to the housing 1, and the other end is connected to the movable plug 61. The middle part of the driving rod 62 is bent to form a supporting point A. Specifically, a large amount of gas is generated in the arc extinguishing chamber 5 and is discharged through the air hole 51 into the slide groove 101. The slide groove 101 is filled with gas and pushes the movable plug 61 to slide upward relative to the slide groove 101, driving the second end of the driving rod 62 to move upward, and causing the supporting point A in the middle of the driving rod 62 to move upward and abut against the shell 1. Then the movable plug 61 continues to move upward, and the driving rod 62 is driven by the second end of the movable plug 61 to continue to move. The supporting point A abuts against the shell 1 to form a fulcrum, so that the driving rod 62 as a whole moves like a seesaw, and then the first end of the driving rod 62, that is, the movable plug 61, swings downward toward one end of the release portion 41, thereby driving the driving rod 62 to press the release portion 41 downward.

[0058] As an optional implementation, refer to Figures 8 to 10 As shown, the chute 101 is opened along the second direction, and the movable plug 61 slides in the chute 101 to slide in the direction close to or away from the release part 41. The first end of the driving rod 62 is bent toward the release part 41 to form a driving head 621, and the release part 41 is correspondingly provided with a driving plate 411. Specifically, a large amount of gas is generated in the arc extinguishing chamber 5 and discharged into the chute 101 through the air hole 51. The chute 101 is filled with gas and pushes the movable plug 61 to slide relative to the chute 101 toward the side away from the release part 41, driving the driving rod 62 to move synchronously toward the side away from the release part 41, and then the driving head 621 moves and abuts against the driving plate 411. The driving rod 62 continues to move toward the side away from the release part 41, so that the driving head 621 can push against the driving plate 411, thereby providing a downward pressure component to the release part 41, thereby realizing the downward pressure action on the release part 41, and driving the traction rod 4 to release.

[0059] As an optional embodiment, the movable plug 61 is hingedly arranged on the housing 1, and the gas generated in the arc extinguishing chamber 5 is discharged through the air hole 51 to push the side of the movable plug 61 facing away from the tripping part 41 to swing upward, so that the movable plug 61 swings downward toward the side of the tripping part 41 to make the driving rod 62 press down the tripping part 41. Specifically, in this embodiment, the movable plug 61 is hingedly arranged on the housing 1 through a hinge shaft (not shown), and the gas is discharged outside the air hole 51, which can push the side of the movable plug 61 facing away from the tripping part 41 to swing upward, similar to the movement of a seesaw, so that the movable plug 61 swings downward toward the side of the tripping part 41 at the same time, thereby driving the driving rod 62 to press down the tripping part 41.

[0060] In this embodiment, the elastic member 63 can be configured as a torsion spring. The torsion spring is sleeved on the hinge shaft, one end of the torsion spring is connected to the movable plug 61, and the other end is connected to the housing 1.

[0061] Optionally, the arc extinguishing chamber 5 and the housing 1 may also be enclosed together to form an accommodating cavity 51, and the movable plug 61 is located in the accommodating cavity 51. The provision of the accommodating cavity 51 facilitates the arrangement of the movable plug 61 and provides a movable space for the movable plug 61.

[0062] In this embodiment, refer to Figure 11 to Figure 12 As shown, the circuit breaker also includes a current transformer 7, the second electrical connector 3 includes a plurality of conductive members 31, the plurality of conductive members 31 are arranged at intervals along the first direction, the conductive member 31 includes a first conductive portion 311 extending along the second direction, the current transformer 7 is provided with a plurality of conductive members 31 and corresponds to the first conductive portion 311 one by one, the current transformer 7 is sleeved on the first conductive portion 311 of the corresponding conductive member 31, and the axial direction of the current transformer 7 is parallel to the second direction. The first direction is perpendicular to the second direction. Specifically, the current transformer 7 is sleeved on the first conductive portion 311 of the corresponding conductive member 31, and by setting the current transformer 7, it can cooperate with the measuring instrument to measure the current in the circuit, and cooperate with the relay protection device to protect the power system and equipment from overload and overcurrent, thereby ensuring the safe operation of the power system.

[0063] In this embodiment, the second electrical connector 3 includes three conductive members 31 spaced apart along the first direction, and the number of the current transformers 7 is also correspondingly set to three. The three conductive members 31 may correspond to the three phases of the alternating current respectively.

[0064] Furthermore, the circuit breaker also includes a zero-sequence transformer 8, the conductive member 31 includes a second conductive portion 312 extending along the third direction, the second conductive portion 312 is connected to the first conductive portion 311, the zero-sequence transformer 8 is sleeved on a plurality of second conductive portions 312, and the axial direction of the zero-sequence transformer 8 is parallel to the third direction. The first direction, the second direction and the third direction are arranged orthogonally in pairs. Specifically, the zero-sequence transformer 8 is axially parallel to the third direction, and the current transformer 7 is axially parallel to the second direction. Such an arrangement is equivalent to vertically arranging the axes of the zero-sequence transformer 8 and the current transformer 7. Such an arrangement can further compact the internal structure of the circuit breaker and further reduce the structural volume of the circuit breaker while ensuring reliable performance.

[0065] Optionally, the second conductive portion 312 is configured as a hollow conductive metal tube.

[0066] Optionally, the second conductive part 312 is configured as a metal tube rod.

[0067] Further, a third conductive portion 313 is connected between the first conductive portion 311 and the second conductive portion 312, and the zero-sequence mutual inductor 8 is supported on a plurality of third conductive portions 313. Specifically, the extension direction of the third conductive portion 313 is located on a plane formed by the first direction and the second direction. The zero-sequence mutual inductor 8 is supported on a plurality of third conductive portions 313 at the same time, and the third conductive portion 313 can provide a reliable supporting space for the zero-sequence mutual inductor 8.

[0068] Specifically, the third conductive part 313 has a conductive connecting plate at one end facing the first conductive part 311. The conductive connecting plate has a mounting hole, and can be fixedly connected to the first conductive part 311 through a connecting piece passing through the mounting hole, thereby achieving fixation between the first conductive part 311 and the conductive connecting plate.

[0069] Optionally, the connecting member is configured as a screw, and the screw passes through a mounting hole and is threadedly connected to the first conductive portion 311 , which has a simple structure and a reliable and tight connection.

[0070] In this embodiment, one end of the second conductive portion 312 facing away from the first conductive portion 311 is connected to a conductive connection terminal 314 extending out of the housing 1. The conductive connection terminal 314 is provided for connecting and electrically conducting with one side of a power source.

[0071] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A circuit breaker, characterized in that: It comprises a housing (1), and a traction rod (4), an arc extinguishing chamber (5) and a tripping drive (6) arranged in the housing (1); wherein: The tripping drive member (6) comprises a movable plug (61) and a driving rod (62), the arc extinguishing chamber (5) is provided with an air hole, a first end of the driving rod (62) is connected to the movable plug (61), and a second end of the driving rod (62) is arranged corresponding to the tripping portion (41) of the traction rod (4); The gas generated in the arc extinguishing chamber (5) is discharged through the gas hole to push the movable plug (61) to move, and the movable plug (61) is configured to drive the driving rod (62) to move and press down the release part (41) to drive the traction rod (4) to release.

2. The circuit breaker according to claim 1, characterized in that: The release drive member (6) further comprises an elastic member (63), a first end of the elastic member (63) being connected to the housing (1), a second end of the elastic member (63) being connected to the movable plug (61), and the elastic member (63) being used to drive the movable plug (61) to reset.

3. The circuit breaker according to claim 2, characterized in that: The elastic member (63) is configured as a spring.

4. The circuit breaker according to claim 1, characterized in that: The movable plug (61) is provided with an insertion hole (611), and the first end of the driving rod (62) is fixedly inserted into the insertion hole (611).

5. The circuit breaker according to claim 1, characterized in that: The housing (1) has a slide groove (101), the movable plug (61) is located in the slide groove (101), the air hole (51) is arranged in communication with the slide groove (101), and the gas generated in the arc extinguishing chamber (5) is discharged through the air hole (51) to push the movable plug (61) to slide relative to the slide groove (101), so that the driving rod (62) moves and presses down the tripping part (41).

6. The circuit breaker according to claim 1, characterized in that: The movable plug (61) is hingedly arranged on the housing (1), and the gas generated in the arc extinguishing chamber (5) is discharged through the gas hole (51) to push the movable plug (61) to swing upward on the side away from the release part (41), so that the movable plug (61) swings downward toward the side of the release part (41) so that the driving rod (62) presses down the release part (41).

7. The circuit breaker according to claim 1, characterized in that: It also comprises a second electrical connector (3) and a current transformer (7), wherein the second electrical connector (3) comprises a plurality of conductive members (31), the plurality of conductive members (31) are arranged at intervals along a first direction, the conductive member (31) comprises a first conductive portion (311) extending along a second direction, the current transformer (7) is provided with a plurality of conductive members (311) corresponding to the first conductive portions (311) one by one, the current transformer (7) is sleeved on the first conductive portion (311) of the corresponding conductive member (31), and the axial direction of the current transformer (7) is parallel to the second direction; The first direction is perpendicular to the second direction.

8. The circuit breaker according to claim 7, characterized in that: It also includes a zero-sequence mutual inductor (8), wherein the conductive member (31) includes a second conductive portion (312) extending along a third direction, the second conductive portion (312) is connected to the first conductive portion (311), the zero-sequence mutual inductor (8) is sleeved on a plurality of the second conductive portions (312), and the axial direction of the zero-sequence mutual inductor (8) is parallel to the third direction; The first direction, the second direction and the third direction are arranged orthogonally in pairs.

9. The circuit breaker according to claim 8, characterized in that A third conductive part (313) is connected between the first conductive part (311) and the second conductive part (312), and the zero-sequence mutual inductor (8) is supported on a plurality of the third conductive parts (313).

10. The circuit breaker according to claim 8, characterized in that One end of the second conductive portion (312) facing away from the first conductive portion (311) is connected to a conductive connection terminal (314) extending outside the housing (1).

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