CN219303592U - Magnetic conduction block, magnetic blowing structure and circuit breaker - Google Patents

Abstract

The utility model discloses a magnetic conduction block, a magnetic blowing structure and a circuit breaker, which are provided with a U-shaped magnetic conduction block, a permanent magnet and a moving arc root movement track, wherein the permanent magnet is arranged in the U-shaped magnetic conduction block, the permanent magnet is clamped between the moving arc root movement track and a bottom plate of the magnetic conduction block, the S pole of the permanent magnet is contacted with or close to the bottom plate of the magnetic conduction block, and the N pole of the permanent magnet is contacted with or close to the moving arc root movement track. According to the scheme, under the comprehensive magnetic field after the permanent magnet, the magnetic conduction block and the moving arc root moving track are magnetized, according to different directions of arc currents, the arc can move to the arc running channel and the arc extinguishing chamber under the action of the magnetic field in the area through deflection of the arc separating wall at one side, so that the arc magnetic blowing effect of bidirectional current is realized, the alternating current arc and the bidirectional direct current arc are effective, the scheme is easy to realize, the structure is simple, the cost is low, and the circuit breaker electric life is improved remarkably.

Description

Magnetic conduction block, magnetic blowing structure and circuit breaker

Technical Field

The utility model belongs to the technical field of piezoelectric devices, and particularly relates to a magnetic conduction block, a magnetic blowing structure and a circuit breaker.

Background

Along with the rapid development of the fields of photovoltaic power generation, energy storage and the like, the nonpolar direct current switch is increasingly applied, and the performance requirement is also higher and higher, and is mainly reflected in the promotion of voltage class, electrical service life, breaking capacity and the like.

In the prior art, the breaking of a low-voltage direct current arc generally utilizes means such as magnetic blowing, air blowing and the like to accelerate the movement of the arc, and the arc voltage is lifted through means such as elongation, compression, cooling, cutting and the like to limit the current to zero crossing. However, the critical current driving force of the prior art on direct current is insufficient, breaking is difficult, and the breaking of rated current is very serious due to longer arcing time, so that the difficulty of improving the electrical life is great.

The movement of the arc and the transfer from the contact area can be accelerated by driving the arc with an externally applied magnetic field, but since the permanent magnets have a certain polarity, the permanent magnets are generally applied to a dc switch of a certain polarity connection mode. If the strong magnetic blowing effect of the external magnetic field on the electric arc is realized, the polarity problem can be solved, and the method has important significance for breaking the direct current critical current and improving the electrical life under the rated current.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a magnetic conduction block, a magnetic blowing structure and a circuit breaker so as to solve the problems of difficulty in breaking nonpolar direct current critical current and great difficulty in improving the electrical life under rated current in the prior art.

In order to achieve the purpose, the utility model is realized by adopting the following technical scheme:

the magnetic conduction block comprises a bottom plate, wherein one side edge of the bottom plate is integrally connected with a first side plate, the other side edge of the bottom plate is integrally connected with a second side plate, and the first side plate and the second side plate are oppositely arranged; the first side plate and the second side plate are perpendicular to the bottom plate;

the first side plate and the second side plate are identical in shape and size and comprise a first part and a second part which are integrally connected, and the rear end face of the first part is integrally connected with the front end face of the second part; the second part is of a rectangular plate-shaped structure;

the front end face of the first part is divided into a front vertical face, a first inclined face and a second inclined face which are sequentially and integrally connected from top to bottom; the slope of the second inclined surface is greater than the slope of the first inclined surface with respect to the vertical direction.

The utility model further improves that:

preferably, the magnetic conduction block is one of pure iron, low carbon steel, silicon steel sheet, permalloy or ferrite.

Preferably, the bottom plate is disposed between the two second inclined surfaces or between the bottoms of the two parts.

The magnetic blowing structure comprises the magnetic conduction block, wherein the upper surface of the bottom plate is provided with a permanent magnet; the S-pole of the permanent magnet faces the upper surface of the bottom plate; an arc root movement track is arranged above the permanent magnet.

Preferably, the arc root movement track comprises a movable arc-striking part, the movable arc-striking part is of a U-shaped structure, the lower end of the front part of the movable arc-striking part is integrally connected with a movable connecting part, the lower end of the rear part of the movable arc-striking part is integrally connected with the upper end of a movable arc-driving part, the lower end of the movable arc-driving part is integrally connected with a movable arc root stagnation part, the movable arc root stagnation part is horizontally arranged, and the movable arc root stagnation part is arranged above the permanent magnet.

Preferably, the moving arc root motion track is a soft magnet.

Preferably, the inner surface of the first side plate is covered with a first arc-separating wall, and the inner surface of the second side plate is covered with a second arc-separating wall.

The circuit breaker comprises the magnetic blowing structure, wherein a moving contact and a fixed contact are arranged between the first side plate and the second side plate, the moving contact is arranged in front of the fixed contact, and the moving contact is arranged above the arc root movement track.

Preferably, the static contact comprises a static arcing part with a U-shaped structure, the front surface of the static arcing part is provided with a static contact part, one protruding end of the rear end of the static arcing part is connected with a static connecting part, and one protruding end is connected with a static arcing part.

Preferably, an arc extinguishing chamber is arranged between the arc root moving track and the fixed contact, and the arc extinguishing chamber is composed of a metal grid array.

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

the utility model discloses a magnetic conduction block which is a U-shaped magnetic conduction block, wherein the U-shaped magnetic conduction block is magnetized under the action of S polarity surfaces of permanent magnets which are contacted/approached by the U-shaped magnetic conduction block, so that S poles are formed on two side plates of the U-shaped magnetic conduction block.

The utility model also discloses a magnetic blowing structure, which is provided with a U-shaped magnetic conduction block, a permanent magnet and a moving arc root movement track, wherein the permanent magnet is arranged in the U-shaped magnetic conduction block, the permanent magnet is clamped between the moving arc root movement track and a bottom plate of the magnetic conduction block, the S pole of the permanent magnet is contacted with or close to the bottom plate of the magnetic conduction block, and the N pole of the permanent magnet is contacted with or close to the moving arc root movement track. The N pole of the permanent magnet is contacted with/approaches to a moving arc root moving track in the U-shaped structure of the magnetic conduction block, one side of the moving arc root moving track, which is opposite to the permanent magnet, is magnetized into the N pole, and the N pole part of the moving arc root moving track can strengthen the magnetic field intensity of the S poles of the two side plates of the U-shaped magnetic conduction block.

The utility model also discloses a circuit breaker, the circuit breaker is magnetized by the permanent magnet, the magnetic conduction block and the moving arc root moving track, and the electric arc can deviate to one side of the arc separation wall according to different electric arc current directions, and moves to the arc running channel and the arc extinguishing chamber under the magnetic field effect of the area, so that the electric arc magnetic blowing effect of the bidirectional current is realized, the circuit breaker is effective to both alternating current electric arc and bidirectional direct current electric arc, the structure is easy to realize, the circuit breaker is simply transformed in the prior art, the structure is simple, the cost is low, and the circuit breaker has remarkable effect on the promotion of the electric life of the circuit breaker.

Further, two side plates of the U-shaped magnetic conduction block covering the moving and fixed contact areas and the arc running channel area of the circuit breaker are S poles inwards, and one side of the moving arc root movement track, which faces to the arc area, is N pole after being magnetized, so that magnetic field components parallel to the two side plates of the U-shaped magnetic conduction block are generated in the moving and fixed contact areas and the arc running channel area, and the magnetic force line direction of the magnetic field components is directed to the moving and fixed contact areas from the arc root movement track. Under the action of the magnetic field component parallel to the side plates of the magnetic conduction block, the electric arc can deviate to one side plate, the electric arc can further be acted by the S-polarity magnetic field of the side plate of the magnetic conduction block to move towards the arc-extinguishing chamber, and the electric arc current direction is different and only reflected in the difference of the deviated side plates, but can be subjected to Lorentz force pointing to the direction of the arc-extinguishing chamber, so that the electric arc magnetic blowing effect of the bidirectional current is realized, and the electric arc magnetic blowing device is effective to both alternating-current electric arc and bidirectional direct-current electric arc.

Furthermore, after the electric arc is generated on the movable contact and the static contact, the electric arc can be quickly transferred to the arc running channel under the action of an external magnetic field, so that compared with the electric arc transfer under the actions of magnetic blowing, air blowing and the like generated by the electric arc and current carrying of the contact in the prior art, the technical scheme provided by the utility model can obviously shorten the dead time of the electric arc on the movable contact and the static contact, reduce the ablation of contact materials and have obvious effect on the improvement of the electric life of the circuit breaker.

Drawings

FIG. 1 is a schematic diagram of a magnetic blow-through structure according to a first embodiment of the present utility model;

FIG. 2 is a schematic diagram of a magnetizer according to a first embodiment of the present utility model;

FIG. 3 is a schematic diagram of a side wall structure of a magnetizer according to a first embodiment of the present utility model;

FIG. 4 is a schematic diagram of a side wall of a magnetizer and a moving arc root track structure according to a first embodiment of the present utility model;

fig. 5 is a schematic view of a static contact structure according to a first embodiment of the present utility model;

fig. 6 is a schematic structural view of an arc extinguishing system of a circuit breaker according to a first embodiment of the present utility model;

FIG. 7 is a schematic diagram of a magnetic blow-through structure according to a second embodiment of the present utility model;

FIG. 8 is a schematic diagram of a magnetizer according to a second embodiment of the present utility model;

FIG. 9 is a schematic diagram of a side wall structure of a magnetizer according to a second embodiment of the present utility model;

fig. 10 is a schematic structural view of a circuit breaker arc extinguishing system according to a second embodiment of the present utility model.

Wherein: 100. a magnetic conductive block; 101. a bottom plate; 102. a first side plate; 103. a second side plate; 200. a permanent magnet; 300. a moving arc root movement track; 301. a movable arc-driving part; 302. a movable arcing part; 303. a movable connection part; 304. a moving arc root stagnation part; 400. a moving contact; 500. a stationary contact; 501. a static contact portion; 502. a static arcing part; 503. a static connection part; 504. static arc-driving part; 600. an arc extinguishing chamber; 700. an arc partition wall; 701. a first arc partition wall; 702. a second arc partition wall; 104. a first portion; 105. a second portion; 106. a front vertical face; 107. a first inclined surface; 108. and a second inclined surface.

Detailed Description

The utility model is described in further detail below with reference to the attached drawing figures:

in the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in the specific direction, and thus should not be construed as limiting the present utility model; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1, in an embodiment, the magnetic conductive block 100 includes a bottom plate 101, and a first side plate 102 and a second side plate 103 extending from two sides of the bottom plate 101 in the same direction, the magnetic conductive block 100 has a U-shaped structure, the bottom plate 101 has a bottom of the U-shaped structure, the first side plate 102 and the second side plate 103 have two arms of the U-shaped structure, and two ends of the bottom plate 101 are respectively connected with the bottom of the first side plate 102 and the bottom of the second side plate 103.

The first side plate 102 and the second side plate 103 have the same structure and size, and each comprises a first part 104 and a second part 105 which are integrally connected, wherein the rear end surface of the first part 104 is integrally connected with the front end surface of the second part 105; all direction settings in the present utility model are based on this, and will not be described in detail later.

The first portion 104 is irregularly shaped, and the second portion 105 is rectangular parallelepiped plate-shaped; two lateral ends of the bottom plate 101 are connected to two second portions 105; the front end surface of the first portion 104 is divided into a front vertical surface 106, a first inclined surface 107 and a second inclined surface 108 which are connected in sequence, the lower end of the front vertical surface 106 is integrally connected with the upper end of the first inclined surface 107, the lower end of the first inclined surface 107 is integrally connected with the upper end of the second inclined surface 108, and the lower end of the second inclined surface 108 is integrally connected with the front end surface of the second portion 105 on the same side. The height of the first portion 104 is higher than the second portion 105 such that the upper end of the first portion 104 protrudes a portion of the second portion 105.

In the embodiment, the magnetic conductive block is a soft magnetic body, and can be one of pure iron, low carbon steel, silicon steel sheet, permalloy and ferrite.

Referring to fig. 2 and 3, the present utility model further provides a magnetic blowing structure, which has a magnetic conductive block 100 and a permanent magnet 200, wherein the permanent magnet 200 is disposed on the bottom plate 101, the S-pole face of the permanent magnet 200 guides the bottom plate 101 of the magnetic block 100, and the S-pole face of the permanent magnet 200 contacts or approaches the bottom plate 101.

Referring to fig. 4 and 5, the embodiment of the magnetic blowing structure provided by the present utility model further has a moving arc root moving track 300, where the moving arc root moving track 300 includes a moving arc-striking portion 302 with a U-shaped structure, a moving arc-driving portion 301 and a moving connecting portion 303 extending from two sides of the moving arc-striking portion 302 in the same direction, and a moving arc root stagnation portion 304 extending from the moving arc-striking portion 302 in a direction away from the moving arc-driving portion 301. More specifically, the front end of the movable arcing section 302 is connected to one end of the movable connecting section 303, the rear end of the movable arcing section 302 is connected to the upper end of the movable arcing section 301, the movable arcing section 301 is arranged obliquely, the lower end thereof is connected to the movable arcing root stagnation section 304, and the movable arcing root stagnation section 304 is arranged horizontally.

Referring to fig. 4, in this embodiment, a moving arc root stagnation portion 304 of a moving arc root motion track 300 is disposed inside a U-shaped structure of a magnetic conductive block 100, the permanent magnet 200 is disposed between the moving arc root stagnation portion 304 and the bottom plate 101 of the magnetic conductive block 100, and an N-pole face of the permanent magnet 200 is in contact with or close to the moving arc root stagnation portion 304.

The moving arc root moving track 300 is a soft magnet, and can be selected from one of pure iron, low carbon steel, silicon steel sheet, permalloy and ferrite.

Referring to fig. 2, the embodiment of the magnetic blowing structure provided by the present utility model further has a partition wall 700, where the partition wall 700 includes a first partition wall 701 and a second partition wall 702, the first partition wall 701 and the second partition wall 702 are disposed on the inner side of the U-shaped structure of the magnetic conductive block 100, the first partition wall 701 covers the first side plate 102 of the magnetic conductive block 100, the second partition wall 702 covers the second side plate 103 of the magnetic conductive block 100, the moving driving arc portion 301 of the moving arc root motion track 300 is located between the first partition wall 701 and the second partition wall 702, and the first partition wall 701 and the second partition wall 702 are made of high temperature resistant insulating materials, which are gas generating materials or non-gas generating materials.

Referring to fig. 6, the present utility model provides an embodiment of a circuit breaker, which has a moving contact 400, a fixed contact 500, an arc extinguishing chamber 600, a magnetic conduction block as described in any one of the above, and a magnetic blowing structure as described in any one of the above, wherein the moving contact 400 and the fixed contact 500 are disposed opposite to each other, the moving contact 400 can make contact and separation actions with respect to the fixed contact 500, the moving contact 400 and the fixed contact 500 form an arc generating area, the moving contact 400 and the fixed contact 500 are disposed between the first side plate 102 and the second side plate 103, and the moving contact 400 is in front of the fixed contact 500. The arc extinguishing chamber 600 is arranged at the rear side of the magnetic conduction block 100 and above the moving arc root stagnation part 304, and further, the arc extinguishing chamber 600 is arranged at the rear side of the second part 105; the arc extinguishing chamber 600 has a plurality of metal bars which are isolated from each other and parallel to each other, the distances between adjacent metal bars are equal, the metal bars are horizontally arranged, parallel to the moving arc root stagnation portion, the arc extinguishing chamber 600 constitutes an arc extinguishing region, and the magnetic blowing structure is located between the arc generating region and the arc extinguishing region. The circuit breaker also has a housing made of an insulating material, in which the magnetic blowout structure, the moving contact 400, the fixed contact 500, and the arc extinguishing chamber 600 are enclosed.

Referring to fig. 7, in the present embodiment, a stationary contact 500 has a stationary contact portion 501, a stationary arcing portion 502, a stationary connection portion 503, and a stationary arcing portion 504. The static arcing part 502 is of a U-shaped structure, the front end of the static arcing part 501 is connected with the static contact part 501, and the static contact part 501 is contacted with the moving contact 400; the upper portion of the static arcing section 502 is provided with a static connection section 503 along extension, the lower portion of the static arcing section 502 is provided with a static arcing section 504 along extension, and the static arcing section 504 is above the arc extinguishing chamber 600.

The arc extinguishing chamber 600 is arranged between the static arc driving part 504 of the static contact 500 and the moving arc root stagnation part 304 of the moving arc root movement track 300, the arc extinguishing chamber 600 is composed of metal grid plates which are equidistantly arrayed, and the metal grid plates of the arc extinguishing chamber 600 are parallel to the static arc driving part 504 and the moving arc root stagnation part 304.

The working principle of the embodiment of the magnetic conduction block, the magnetic blowing structure and the circuit breaker is as follows:

the inner side of the bottom 101 of the magnetic conductive block 100 is in contact with or close to the S pole of the permanent magnet 200, and after being magnetized, the inner sides of the first side plate 102 and the second side plate 103 of the magnetic conductive block 100 are both S poles. In addition, the N pole face of the permanent magnet 200 contacts with the moving arc root stagnation portion 304 of the moving arc root motion track 300, the material of the moving arc root motion track 300 is also a soft magnet, and after being magnetized by the permanent magnet 200, the side of the moving arc root motion track 300 facing away from the permanent magnet 200 is the N pole; further, the N pole of the moving arc root moving track 300 guides the first side plate 102 and the second side plate 103 of the magnetic block 100, so as to further strengthen the magnetic field strength of the inner S poles of the first side plate 102 and the second side plate 103 of the magnetic block 100. In summary, in the region surrounded by the moving arc root moving track 300, the fixed contact 500, the moving contact 400, the first partition arc wall 501 and the second partition arc wall 502, there are two opposite S poles of the first side plate 102 and the second side plate 103, and the N pole of the moving arc root moving track 300, so that there is a magnetic field component having magnetic lines of force directed perpendicularly to the first partition arc wall 701 in the region near the first partition arc wall 701, there is a magnetic field component having magnetic lines of force directed perpendicularly to the second partition arc wall 702 in the region near the second partition arc wall 702, and there is a magnetic field component having magnetic lines of force directed perpendicularly to the second partition arc wall 702 in parallel to the partition arc walls. If the arc current flows from the fixed contact 500 to the moving contact 400, the arc will deflect to the arc separating wall at the outer side of the paper surface as shown by the action of the magnetic field component of the magnetic force line parallel to the arc separating wall pointing to the moving and fixed contact areas, and then move to the arc running channel and the arc extinguishing chamber under the action of the magnetic field component of the magnetic force line vertically pointing to the arc separating wall near the side arc separating wall; if the arc current flows from the movable contact 400 to the fixed contact 500, the arc will deflect to the arc separating wall on the inner side of the paper surface as shown by the action of the magnetic field component of the magnetic force line parallel to the arc separating wall pointing to the movable contact area and the fixed contact area, and then will move to the arc running channel and the arc extinguishing chamber under the action of the magnetic field component of the vertical pointing to the arc separating wall near the side arc separating wall. Therefore, the arc is subjected to Lorentz force tending to the direction of the arc running channel and the direction of the arc extinguishing chamber no matter how directional, and only the biased arc separating wall is different, so that the arc magnetic blowing effect of bidirectional current is realized, and the arc magnetic blowing device is effective to both alternating current arcs and bidirectional direct current arcs.

Referring to fig. 8, 9, 10 and 11, in another embodiment of the magnetic conductive block, the magnetic blowing structure and the circuit breaker provided by the present utility model, in this embodiment, a moving arc driving portion 301 of a moving arc root moving track 300 is disposed at an inner side of a U-shaped structure of the magnetic conductive block 100, side edge portions of a first side plate 102 and a second side plate 103 are connected by a bottom plate 101, a permanent magnet 200 is disposed between the moving arc driving portion 301 and the bottom plate 101 of the magnetic conductive block 100, and an N pole face of the permanent magnet 200 is in contact with or close to the moving arc driving portion 301. Accordingly, the bottom plate 101 of the magnetic conductive block 100 is biased toward the middle of the first sidewall 102 and the second sidewall 103, corresponding to the movable arc driving portion 301.

In summary, the magnetic conduction block, the magnetic blowing structure and the circuit breaker provided by the utility model utilize the S pole of the permanent magnet to magnetize the U-shaped magnetic conduction block and utilize the N pole of the permanent magnet to magnetize the moving arc root movement track, so that on one hand, the magnetic field intensity of the S poles after magnetization of the two side plates of the magnetic conduction block is enhanced, and on the other hand, by matching the N poles of the arc running channel with the S poles of the side plates of the magnetic conduction block, the magnetic field component of magnetic force lines in the arc movement cavity, which are parallel to the contact area of the arc separation wall, and the magnetic field component of magnetic force lines near the side plates of the magnetic conduction block, which are respectively and vertically directed to the side plates, are obtained. Under such comprehensive magnetic field distribution, according to the arc current direction difference, the electric arc can pass through and deviate to one side of the arc wall to run arc way and explosion chamber motion under the magnetic field effect in this region, realized the electric arc magnetic blow effect of bi-directional current, it is effective to exchange electric arc and bi-directional direct current electric arc, and this scheme easily realizes simple structure, with low costs, also has showing the effect to the promotion of circuit breaker electric life.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (10)

1. The magnetic conduction block is characterized by comprising a bottom plate (101), wherein one side edge of the bottom plate (101) is integrally connected with a first side plate (102), the other side edge of the bottom plate (101) is integrally connected with a second side plate (103), and the first side plate (102) and the second side plate (103) are oppositely arranged; the first side plate (102) and the second side plate (103) are perpendicular to the bottom plate (101);

the first side plate (102) and the second side plate (103) are identical in shape and size and comprise a first part (104) and a second part (105) which are integrally connected, and the rear end face of the first part (104) is integrally connected with the front end face of the second part (105); the second part (105) is of a rectangular plate-like structure;

the front end surface of the first part (104) is divided into a front vertical surface (106), a first inclined surface (107) and a second inclined surface (108) which are sequentially and integrally connected from top to bottom; the slope of the second inclined surface (108) is greater than the slope of the first inclined surface (107) with respect to the vertical direction.

2. The magnetic block of claim 1, wherein the magnetic block is one of pure iron, mild steel, silicon steel sheet, permalloy, or ferrite.

3. A magnetic block according to claim 1, characterized in that the bottom plate (101) is arranged between two second inclined surfaces (108) or between the bottoms of the two parts (105).

4. A magnetic blowing structure, characterized by comprising the magnetic conductive block of claim 1, wherein the upper surface of the bottom plate (101) is provided with a permanent magnet (200); the S-pole of the permanent magnet (200) faces the upper surface of the bottom plate (101); an arc root movement track (300) is arranged above the permanent magnet (200).

5. The magnetic blowing structure according to claim 4, wherein the arc root movement track (300) comprises a movable arcing part (302), the movable arcing part (302) is of a U-shaped structure, a movable connecting part (303) is integrally connected to the lower end of the front part of the movable arcing part (302), the lower end of the rear part of the movable arcing part (302) is integrally connected to the upper end of a movable arcing part (301), the lower end of the movable arcing part (301) is integrally connected to a movable arcing root stagnation part (304), the movable arcing root stagnation part (304) is horizontally arranged, and the movable arcing root stagnation part (304) is arranged above the permanent magnet (200).

6. A magnetic blow-through structure according to claim 4, wherein the arc root motion trajectory (300) is a soft magnet.

7. A magnetic blow-through structure according to claim 4, wherein the inner surface of the first side plate (102) is covered with a first arc wall (701) and the inner surface of the second side plate (103) is covered with a second arc wall (702).

8. A circuit breaker, characterized in that comprises the magnetic blowing structure of claim 4, wherein a moving contact (400) and a fixed contact (500) are arranged between the first side plate (102) and the second side plate (103), the moving contact (400) is arranged in front of the fixed contact (500), and the moving contact (400) is arranged above the arc root movement track (300).

9. The circuit breaker according to claim 8, wherein the stationary contact (500) comprises a stationary arcing part (502) with a U-shaped structure, a stationary contact part (501) is arranged on the front surface of the stationary arcing part (502), a stationary connection part (503) is connected to a protruding end of the rear end of the stationary arcing part (502), and a stationary arcing part (504) is connected to a protruding end.

10. The circuit breaker according to claim 8, characterized in that an arc extinguishing chamber (600) is arranged between the arc root movement track (300) and the stationary contact (500), the arc extinguishing chamber (600) being composed of an array of metal grid plates.

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