Miniature circuit breaker arc extinguishing system

Abstract

An arc extinguishing system of a miniature circuit breaker belongs to the technical field of low-voltage electrical appliances, and magnetizes a ferromagnet by utilizing the contact between the ferromagnet and a first permanent magnet and the contact between the first permanent magnet and the ferromagnet which are arranged at the back of a static contact, so that the ferromagnet presents magnetism to the outside; the two side walls of the ferromagnet and the side, close to the static conducting rod, of the magnetizing part show the same polarity as the first polarity face of the first permanent magnet, and meanwhile the magnetic field of the side, close to the static conducting rod, of the magnetizing part is stronger than that of the two side walls of the ferromagnet. Under the action of different magnetic field components, electromagnetic force capable of driving bidirectional current arcs to move towards the direction of the arc extinguish chamber is generated in the arc extinguish chamber, and a remarkable effect is achieved on arc extinguishing of non-polar direct-current arcs.

Description

TECHNICAL FIELD

[0001] The utility model belongs to low voltage electrical apparatus technical field relates to a low voltage electrical apparatus's arc extinguishing technology, especially a micro circuit breaker arc extinguishing system. BACKGROUND

[0002] Low voltage DC switch electrical apparatus is a kind of in low voltage DC circuit for controlling the switch device of electrical equipment power supply.It can manually or automatically control whether the circuit is energized to achieve the purpose of controlling electrical equipment, and low voltage DC switch electrical apparatus plays an important control and protection role in low voltage DC circuit. Through reasonable selection, correct installation and regular maintenance can ensure its safe and reliable operation.

[0003] Non-polar arc breaking is a key technical problem of low voltage DC switch electrical apparatus, in the arc breaking of polarity, permanent magnet is usually used to lengthen or drive arc movement, so that arc movement is extinguished in arc extinguishing chamber. However, for non-polar arc, since the polarity of permanent magnet is fixed, permanent magnet cannot be directly used to drive arc. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a micro circuit breaker arc extinguishing system to solve the technical problem that the polarity of permanent magnet of non-polar arc is fixed in prior art, and permanent magnet cannot be directly used to drive arc.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] A micro circuit breaker arc extinguishing system, comprising:

[0007] Static contact, the static contact is provided with ferromagnetic body, and the ferromagnetic body includes magnetized part, first side wall and second side wall;The magnetized part is arranged on the static contact, and the first side wall and the second side wall are connected respectively at both ends;

[0008] Arc extinguishing chamber, one end of static arc runner is arranged above the arc extinguishing chamber, and the other end is connected with static contact;One end of dynamic arc runner is arranged below the arc extinguishing chamber, and the other end is arranged above dynamic contact;Dynamic arc runner is close to the position of dynamic contact in off state and there is a spacing, and first arc separation wall and second arc separation wall are arranged on both sides of static contact and dynamic contact;And static contact and dynamic contact are located between the first side wall and the second side wall of ferromagnetic body.

[0009] Preferably, the static contact includes static conducting rod, one side of the static conducting rod is provided with static contact point, the other side is provided with first permanent magnet, and the static conducting rod is further provided with ferromagnetic body, and the ferromagnetic body contacts the first permanent magnet and is located on both sides of static contact point.

[0010] Preferably, the ferromagnetic body comprises a magnetized part, a first sidewall and a second sidewall; the magnetized part, the first sidewall and the second sidewall form a U-shaped structure, the first sidewall and the second sidewall are two wall surfaces of the U-shaped structure respectively, and the magnetized part is a bottom connecting surface of the U-shaped structure; the ferromagnetic body is sleeved on the static conductive rod, the U-shaped structure outer side surface of the magnetized part is in contact with the first polarity surface of the first permanent magnet, and the first sidewall and the second sidewall are located on both sides of the static contact point.

[0011] Preferably, the first sidewall and the second sidewall are symmetrically arranged relative to the magnetized part, and the first sidewall comprises a conducting part and an arc-shaped part; one end of the conducting part is connected with the magnetized part, and the other end of the conducting part is connected with the arc-shaped part.

[0012] Preferably, the magnetized part comprises a fixed connecting part and a contact part; the connecting part is connected with the first sidewall and the second sidewall, and the contact part is in contact with the first polarity surface of the first permanent magnet.

[0013] Preferably, the magnetized part comprises a connecting part and a contact part; the included angle between the connecting part and the contact part is 90°-180°, and the included angle is away from the dynamic running arc.

[0014] Preferably, the upper end of the contact part is not lower than the upper end of the static contact point; the plane of the contact part is parallel to the plane of the static contact point, or the included angle between the two planes is an acute angle, and the acute angle is towards the dynamic running arc.

[0015] Preferably, the first sidewall and the second sidewall of the ferromagnetic body are located on both sides of the static contact point and between the static contact head and the dynamic running arc respectively.

[0016] Preferably, the dynamic contact head is provided with a dynamic contact point, and the first sidewall and the second sidewall comprise arc-shaped parts and conducting parts; the upper end of the arc-shaped part is not lower than the track formed by the opening and closing movement of the dynamic contact point relative to the static contact point.

[0017] Preferably, the dynamic running arc is fixedly provided with a second permanent magnet relative to the back surface of the static contact head; the first polarity surface of the second permanent magnet is in contact with the dynamic running arc; and the polarity of the first polarity surface of the first permanent magnet is opposite to that of the first polarity surface of the second permanent magnet.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The micro circuit breaker arc extinguishing system disclosed in the application utilizes a ferromagnetic body installed behind the static contact and a first permanent magnet, the first permanent magnet contacts the ferromagnetic body, magnetizes the ferromagnetic body, makes the ferromagnetic body present magnetism, and the two side walls of the ferromagnetic body and the magnetization part close to the side of the static conducting rod present the same polarity as the first polarity surface of the first permanent magnet, at the same time, the magnetic field close to the side of the magnetization part close to the static conducting rod is stronger than the magnetic field of the two side walls of the ferromagnetic body. Therefore, the magnetic field distribution with the following characteristics is formed in the area between the moving contact, the static contact and the moving arc track: the magnetic field component parallel to the side wall of the ferromagnetic body (the first magnetic field component), the magnetic field component perpendicular to the side wall near the first side wall (the second magnetic field component) and the magnetic field component perpendicular to the side wall near the second side wall (the third magnetic field component); under the action of the three magnetic field components, the electromagnetic force which can drive the bidirectional current arc to move to the arc extinguishing chamber is generated in the arc extinguishing chamber, and the arc extinguishing effect for the non-polarity direct current arc is remarkable.

[0020] Further, in cooperation with the second permanent magnet behind the moving arc angle, under the action of the first polarity surface of the second permanent magnet, all the magnetic field components are enhanced, and the electromagnetic force which can drive the bidirectional current arc to move to the arc extinguishing chamber is better generated. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 It is a front view of the arc extinguishing system of the present application.

[0023] Figure 2 It is a perspective view of the arc extinguishing system of the present application.

[0024] Figure 3 It is a schematic view of the ferromagnetic body structure of the present application.

[0025] In the drawings: 1 - static contact; 2 - moving contact; 21 - moving contact point; 3 - moving track arc; 4 - static track arc; 5 - arc extinguishing chamber; 6 - first arc separation wall; 7 - second arc separation wall; 8 - ferromagnetic body; 81 - magnetization part; 82 - first side wall; 83 - second side wall; 84 - conducting part; 85 - arc-shaped part; 86 - contact part; 87 - connecting part; 9 - first permanent magnet; 10 - second permanent magnet; 11 - static conducting rod; 12 - static contact point. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0028] It should be noted that: similar reference numbers 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.

[0029] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner" 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 in which the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0030] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0031] In the description of the embodiments of the present application, it should also be noted that unless otherwise explicitly specified and limited, if the terms "set", "mount", "connected", "connected" appear, they should be understood in a broad sense. 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 indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] The present application will be described in further detail below in conjunction with the drawings:

[0033] Referring to Figure 1 、 Figure 2 The application discloses a miniature circuit breaker arc extinguishing system, comprising:

[0034] The static contact 1 is provided with a ferromagnetic body 8, the ferromagnetic body 8 comprises a magnetized part 81, a first side wall 82 and a second side wall 83; the magnetized part 81 is arranged on the static contact 1 and connected with the first side wall 82 and the second side wall 83 at two ends respectively.

[0035] The arc extinguishing chamber 5 is provided with one end of the static arc runner 4 above the arc extinguishing chamber 5, and the other end is connected with the static contact 1; one end of the dynamic arc runner 3 is arranged below the arc extinguishing chamber 5, and the other end is provided with the dynamic contact 2 above; the dynamic arc runner 3 is close to the position of the dynamic contact 2 in the open state and has a spacing; the static contact 1 and the dynamic contact 2 are arranged on the first arc separation wall 6 and the second arc separation wall 7 on both sides; and the static contact 1 and the dynamic contact 2 are located between the first side wall 82 and the second side wall 83 of the ferromagnetic body 8.

[0036] The ferromagnetic body installed behind the static contact and the first permanent magnet are in contact, the ferromagnetic body is magnetized, the ferromagnetic body presents magnetism to the outside, and the two side walls of the ferromagnetic body and the magnetized part close to the static conducting rod show the same polarity as the first polarity surface of the first permanent magnet, and the magnetic field of the side of the magnetized part close to the static conducting rod is stronger than that of the two side walls of the ferromagnetic body. Therefore, the area between the dynamic contact, the static contact and the dynamic arc runner will form a magnetic field distribution with the following characteristics: there is a first magnetic field component parallel to the side wall of the ferromagnetic body, a second magnetic field component perpendicular to the side wall near the first side wall, and a third magnetic field component perpendicular to the side wall near the second side wall; under the action of the three magnetic field components, an electromagnetic force that can drive the bidirectional current arc to move in the direction of the arc extinguishing chamber is generated in the arc extinguishing chamber, which has a significant effect on the arc extinguishing of the non-polarity direct current arc.

[0037] In some embodiments, the static contact 1 comprises a static conducting rod 11, one side of the static conducting rod 11 is provided with a static contact point 12, the other side is provided with a first permanent magnet 9, and the static conducting rod 11 is further provided with a ferromagnetic body 8, the ferromagnetic body 8 is in contact with the first permanent magnet 9 and located on both sides of the static contact point 12.

[0038] In some embodiments, referring to Figure 3, the ferromagnetic body 8 includes a magnetized part 81, a first sidewall 82 and a second sidewall 83; the magnetized part 81 and the first sidewall 82 and the second sidewall 83 form a U-shaped structure, the first sidewall 82 and the second sidewall 83 are respectively two wall surfaces of the U-shaped structure, and the magnetized part 81 is a bottom connecting surface of the U-shaped structure; the ferromagnetic body 8 is sleeved on the static conducting rod 11, the outer side surface of the U-shaped structure of the magnetized part 81 is in contact with the first polarity surface of the first permanent magnet 9, and the first sidewall 82 and the second sidewall 83 are located on both sides of the static contact 12.

[0039] In some embodiments, the first sidewall 82 and the second sidewall 83 are symmetrically arranged relative to the magnetized part 81, the first sidewall 82 includes a conducting part 84 and an arc-shaped part 85; one end of the conducting part 84 is connected to the magnetized part 81, and the other end is connected to the arc-shaped part 85.

[0040] In some embodiments, the magnetized part 81 includes a fixed connecting part 87 and a contact part 86, the connecting part 87 is connected with the first sidewall 82 and the second sidewall 83, and the contact part 86 is in contact with the first polarity surface of the first permanent magnet 9.

[0041] In some embodiments, a micro circuit breaker arc extinguishing system includes: a static contact 1, a moving contact 2, a moving arc running path 3, a static arc running path 4, an arc extinguishing chamber 5, a first arc separation wall 6, and a second arc separation wall 7.

[0042] The static contact 1 has a static conducting rod 11, a static contact 12 fixed on the static conducting rod 11, a ferromagnetic body 8, and a first permanent magnet 9, wherein the ferromagnetic body 8 has a magnetized part 81, a first sidewall 82, and a second sidewall 83.

[0043] The magnetized part 81 and the first sidewall 82 and the second sidewall 83 form a U-shaped structure, the first sidewall 82 and the second sidewall 83 are respectively two wall surfaces of the U-shaped structure, and the magnetized part 81 is a bottom connecting surface of the U-shaped structure;

[0044] The first polarity surface of the first permanent magnet 9 is in contact with the outer side surface of the U-shaped structure of the magnetized part 81;

[0045] The ferromagnetic body 8 is sleeved on the static conducting rod 11 from the back of the static contact 12, the first sidewall 82 and the second sidewall 83 of the ferromagnetic body 8 are respectively located on both sides of the static contact 12, and are simultaneously located between the static contact 1 and the moving arc running path 3;

[0046] The static arc running path 4 is fixedly connected to the static conducting rod 11 and located at one end of the static contact 12 in the direction of the arc extinguishing chamber 5;

[0047] One end of the moving arc running path 3 is close to the position of the moving contact 2 in the open state with a small gap, and the other end of the arc running path extends to the lower part of the arc extinguishing chamber 5.

[0048] The arc extinguishing chamber 5 is located between the moving arc running path 3 and the static arc running path 4.

[0049] The first arc separation wall 6 and the second arc separation wall 7 are respectively located on both sides of the moving contact 2 and the static contact 1, and between the first side wall 82 and the second side wall 83 of the ferromagnetic body 8.

[0050] In some embodiments, the first side wall 82 of the ferromagnetic body 8 has a conducting part 84 and an arc-shaped part 85, the arc-shaped profile of the arc-shaped part 85 extends from the moving contact 2 and the static contact 1 to the arc extinguishing chamber 5, and the conducting part 84 is connected between the magnetization part 81 and the arc-shaped part 85 of the ferromagnetic body 8.

[0051] Similarly, the second side wall 83 of the ferromagnetic body 8 has a conducting part 84 and an arc-shaped part 85, the arc-shaped profile of the arc-shaped part 85 extends from the moving contact 2 and the static contact 1 to the arc extinguishing chamber 5, and the conducting part 84 is connected between the magnetization part 81 and the arc-shaped part 85 of the ferromagnetic body 8.

[0052] In some embodiments, the first side wall 82 and the second side wall 83 of the ferromagnetic body 8 are structurally symmetrical.

[0053] In some embodiments, the upper end of the arc-shaped part 85 of the first side wall 82 and the second side wall 83 of the ferromagnetic body 8 is not lower than the trajectory formed by the opening and closing movement of the moving contact 2 relative to the static contact 1.

[0054] In some embodiments, the arc-shaped part 85 of the first side wall 82 and the second side wall 83 of the ferromagnetic body 8 is located between the static contact 1 and the moving arc running path 3.

[0055] In some embodiments, the profile of the arc-shaped part 85 of the first side wall 82 and the second side wall 83 of the ferromagnetic body 8 is parallel or similar to the profile of the moving arc running path 3.

[0056] In some embodiments, the width of the first side wall 82 and the second side wall 83 of the ferromagnetic body 8 is smaller than the distance between the static contact 1 and the moving arc running path 3.

[0057] In some embodiments, the magnetization part 81 of the ferromagnetic body 8 has a contact part 86 and a connecting part 87, the contact part 86 is in contact with the first polarity surface of the first permanent magnet 9, and the connecting part 87 is connected with the contact part 86, the first side wall 82 and the second side wall 83.

[0058] In some embodiments, the angle between the contact portion 86 of the magnetization portion 81 of the ferromagnetic body 8 and the connecting portion 87 is 90°-180°, and the angle is away from the dynamic running arc 3.

[0059] In some embodiments, the upper end of the contact portion 86 of the magnetization portion 81 of the ferromagnetic body 8 is not lower than the upper end of the static contact point 12.

[0060] In some embodiments, the plane of the contact portion 86 of the ferromagnetic body 8 is parallel to the plane of the static contact point 12, or the angle between the two is an acute angle, and the angle is towards the dynamic running arc 3.

[0061] In some embodiments, the dynamic running arc 3 is fixedly provided with a second permanent magnet 10 opposite to the back surface of the static contact head 1.

[0062] In some embodiments, the first polarity surface of the second permanent magnet 10 is in contact with the dynamic running arc 3.

[0063] In some embodiments, the polarity of the first polarity surface of the first permanent magnet 9 is opposite to that of the first polarity surface of the second permanent magnet 10.

[0064] In some embodiments, the material of the ferromagnetic body 8 is a ferromagnetic material.

[0065] In some embodiments, the material of the dynamic running arc 3 is an electrically conductive ferromagnetic material.

[0066] Working principle:

[0067] The first polarity surface of the first permanent magnet 9 contacts the contact part 86 of the ferromagnetic body 8, which magnetizes the ferromagnetic body 8, so that the ferromagnetic body 8 presents magnetism to the outside, and the two side walls of the ferromagnetic body 8 and the side of the contact part 86 close to the static conducting rod 11 and the side of the connecting part 87 close to the static conducting rod 11 all present the same polarity as the first polarity surface of the first permanent magnet 9, and the magnetic field of the side of the contact part 86 close to the static conducting rod 11 and the side of the connecting part 87 close to the static conducting rod 11 is stronger than the magnetic field of the two side walls of the ferromagnetic body 8. Therefore, the magnetic field distribution in the area between the moving contact 2, the static contact 1 and the moving arc path 3 has the following characteristics: there is a first magnetic field component parallel to the side wall of the ferromagnetic body 8, a second magnetic field component perpendicular to the side wall near the first side wall 82, and a third magnetic field component perpendicular to the side wall near the second side wall 83; if the polarity of the first polarity surface of the first permanent magnet 9 is N, the direction of the first magnetic field component points to the moving arc path 3, the second magnetic field component points from the first side wall 82 to the second side wall 83, and the third magnetic field component points from the second side wall 83 to the first side wall 82; if the polarity of the first polarity surface of the first permanent magnet 9 is S, the direction of the first magnetic field component points to the static contact 1, the second magnetic field component points from the second side wall 83 to the first side wall 82, and the third magnetic field component points from the first side wall 82 to the second side wall 83. In addition, if the second permanent magnet 10 is added, the first magnetic field component, the second magnetic field component and the third magnetic field component are all enhanced under the action of the first polarity surface of the second permanent magnet 10. Taking the case that the polarity of the first polarity surface of the first permanent magnet 9 is N as an example, when the circuit breaker breaks the current, a high-temperature arc is generated between the moving and static contacts 1, and if the arc current points from the moving contact 2 to the static contact 1, the arc is deflected to the first side wall 82 under the action of the first magnetic field component and moves in the direction of the arc extinguishing chamber 5 under the action of the second magnetic field component; similarly, if the arc current points from the static contact 1 to the moving contact 2, the arc is deflected to the second side wall 83 under the action of the first magnetic field component and moves in the direction of the arc extinguishing chamber 5 under the action of the third magnetic field component.

[0068] The preferred embodiments of the utility model are described above, but the utility model is not limited to the embodiments. Those skilled in the art can make various changes and modifications to the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A miniature circuit breaker arc quenching system, characterized by, The application relates to a static contact (1) provided with a ferromagnetic body (8), the ferromagnetic body (8) comprising a magnetized part (81), a first side wall (82) and a second side wall (83); the magnetized part (81) is arranged on the static contact (1) and connected with the first side wall (82) and the second side wall (83) at two ends respectively; an arc extinguishing chamber (5) is arranged above one end of a static arc running track (4) and connected with the static contact (1) at the other end; one end of a dynamic arc running track (3) is arranged below the arc extinguishing chamber (5), the other end is arranged above a dynamic contact (2), the dynamic arc running track (3) is close to the position of the dynamic contact (2) in an open state and has a spacing, the static contact (1) and the dynamic contact (2) are provided with a first arc separation wall (6) and a second arc separation wall (7) on two sides, and the static contact (1) and the dynamic contact (2) are located between the first side wall (82) and the second side wall (83) of the ferromagnetic body (8). The static contact (1) comprises a static conductive rod (11), one side of the static conductive rod (11) is provided with a static contact point (12), the other side is provided with a first permanent magnet (9), the static conductive rod (11) is further provided with the ferromagnetic body (8), the ferromagnetic body (8) is in contact with the first permanent magnet (9) and located on two sides of the static contact point (12). The ferromagnetic body (8) comprises the magnetized part (81), the first side wall (82) and the second side wall (83); the magnetized part (81), the first side wall (82) and the second side wall (83) form a U-shaped structure, the first side wall (82) and the second side wall (83) are two wall surfaces of the U-shaped structure respectively, and the magnetized part (81) is a bottom connecting surface of the U-shaped structure; the ferromagnetic body (8) is sleeved on the static conductive rod (11), the U-shaped structure outer side surface of the magnetized part (81) is in contact with the first polarity surface of the first permanent magnet (9), and the first side wall (82) and the second side wall (83) are located on two sides of the static contact point (12).

2. The miniature circuit breaker arc extinguishing system of claim 1, wherein, The first side wall (82) and the second side wall (83) are symmetrically arranged relative to the magnetized part (81), the first side wall (82) comprises a conducting part (84) and an arc-shaped part (85); one end of the conducting part (84) is connected with the magnetized part (81), and the other end is connected with the arc-shaped part (85).

3. The miniature circuit breaker arc extinguishing system of claim 1, wherein, The magnetized part (81) comprises a fixed connecting part (87) and a contact part (86), the connecting part (87) is connected with the first side wall (82) and the second side wall (83), and the contact part (86) is in contact with the first polarity surface of the first permanent magnet (9).

4. The miniature circuit breaker arc extinguishing system of claim 3, wherein, The magnetized part (81) comprises the connecting part (87) and the contact part (86); the included angle between the connecting part (87) and the contact part (86) is 90-180 degrees, and the included angle is away from the dynamic arc running track (3).

5. The miniature circuit breaker arc extinguishing system of claim 3, wherein, The upper end of the contact part (86) is not lower than the upper end of the static contact point (12); the plane of the contact part (86) is parallel to the plane of the static contact point (12), or the included angle between the two planes is an acute angle, and the acute angle is towards the dynamic arc running track (3).

6. The miniature circuit breaker arc extinguishing system of claim 3, wherein, The first side wall (82) and the second side wall (83) of the ferromagnetic body (8) are located on two sides of the static contact point (12) respectively and between the static contact (1) and the dynamic arc running track (3).

7. The miniature circuit breaker arc extinguishing system of claim 6, wherein, ​ 8. The miniature circuit breaker arc extinguishing system of claim 2, wherein, ​ 9. The miniature circuit breaker arc extinguishing system of claim 2, wherein, The moving contact (2) is provided with a moving contact point (21), the first side wall (82) and the second side wall (83) comprise an arc-shaped part (85) and a conducting part (84); the upper end of the arc-shaped part (85) is not lower than the track formed by the opening and closing movement of the moving contact point (21) relative to the static contact (12).

10. The miniature circuit breaker arc extinguishing system of claim 1, wherein, The moving arc running path (3) is fixedly provided with a second permanent magnet (10) opposite to the back surface of the static contact (1); the first polarity surface of the second permanent magnet (10) is in contact with the moving arc running path (3); and the polarity of the first polarity surface of the first permanent magnet (9) is opposite to that of the first polarity surface of the second permanent magnet (10).

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