CN219202970U

CN219202970U - Circuit breaker and static contact assembly thereof

Info

Publication number: CN219202970U
Application number: CN202320806787.5U
Authority: CN
Inventors: 叶冰; 高林; 刘晓芝; 吴凯伦
Original assignee: Zhejiang Huakai Electric Co ltd; Xiamen Huadian Switchgear Co Ltd
Current assignee: Ouruibo Jiaxing Zhejiang Electric Co ltd; Zhejiang Huakai Electric Co ltd
Priority date: 2023-04-12
Filing date: 2023-04-12
Publication date: 2023-06-16
Anticipated expiration: 2033-04-12

Abstract

The application discloses circuit breaker and static contact subassembly thereof, this static contact subassembly includes the static feeler lever, separate the arc cover, add magnetic assembly and static contact, the static feeler lever is buckled and is set up, be formed with the space of buckling, the static feeler lever is set up to first end along the one end of extending direction, the static feeler lever is set up to the second end along the other end of extending direction, the static contact sets up on the first end of static feeler lever, separate and be formed with the accommodation space on the arc cover, the first end of static feeler lever wears to locate in the accommodation space, add magnetic assembly wears to locate in the accommodation space, link to each other with the first end of static feeler lever, and be located in buckling space; the static contact assembly is simple in structure, the magnetism increasing assembly is arranged below the static contact, so that the magnetic field distribution intensity around the static contact can be enhanced, the electric arc repulsive force effect around the static contact is improved, and the breaking capacity of the circuit breaker contact is improved.

Description

Circuit breaker and static contact assembly thereof

Technical Field

The application relates to the technical field of electric switches, in particular to a circuit breaker and a fixed contact assembly thereof.

Background

The U-shaped contact of the existing circuit breaker adopts a U-shaped fixed type fixed contact, and an insulating protective cover is arranged above the fixed contact.

It can be seen that there is a need for improvements and improvements in the art.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, an object of the present application is to provide a circuit breaker and a static contact assembly thereof, which aim to improve breaking capacity of the circuit breaker.

In order to achieve the above purpose, the present application adopts the following technical scheme:

the application discloses a static contact subassembly of circuit breaker in one aspect, include:

the static contact rod is bent and arranged to form a bending space, one end of the static contact rod along the extending direction is set to be a first end, and the other end of the static contact rod along the extending direction is set to be a second end;

the fixed contact is arranged on the first end of the fixed contact rod;

an arc isolation cover, wherein an accommodating space is formed on the arc isolation cover, and the first end of the static contact rod is penetrated in the accommodating space;

the magnetism increasing component penetrates through the accommodating space, is connected with the first end of the static contact rod and is located in the bending space.

In some embodiments of the present application, the magnetism increasing assembly includes a plurality of magnetism increasing sheets stacked together, and the plurality of magnetism increasing sheets are connected together by a connecting member.

In some embodiments of the present application, the magnetic increasing sheet includes a first magnetic increasing sheet and a second magnetic increasing sheet, where the first magnetic increasing sheet is provided with at least two pieces, the second magnetic increasing sheet is provided with at least two pieces, at least two pieces of the second magnetic increasing sheet are respectively provided at two opposite sides of the first magnetic increasing sheet, and a stacking direction of the magnetic increasing sheets is perpendicular to an extending direction of the second end of the static contact rod;

the first magnetic increasing sheet extends upwards to protrude out of the upper surface of the static contact rod towards one side of the second end of the static contact rod.

In some embodiments of the present application, the first end of the static contact rod is bent to form a U-shaped bending space, the arc isolation cover is respectively provided with a first opening and a second opening communicated with the accommodating space, the first opening faces the second end of the static contact rod, the second opening is arranged at the bottom of the accommodating space, the first end of the static contact rod penetrates into the accommodating space from the second opening and penetrates out of the first opening, and the static contact is arranged on the upper surface of the first end of the static contact rod.

In some embodiments of the present application, the arc shield comprises:

the first arc isolation part is arranged below the magnetism increasing component, is positioned in the bending space, is connected with the static contact rod, and extends towards the second end of the static contact rod;

the second arc separating part is connected with the second end of the first arc separating part and extends to the upper side of the stationary contact, and the accommodating space is arranged in the second arc separating part.

In some embodiments of the present application, the first arc portion that separates includes the first portion of bending, second portion of bending and third portion of bending that sets gradually, the second portion of bending respectively with first portion of bending with the third portion of bending is buckled and is connected, first portion of bending covers on the second end of static feeler lever, just be provided with first connecting hole on the first portion of bending, be provided with the second connecting hole on the static feeler lever, first connecting hole with the second connecting hole corresponds to be connected, in order will separate the arc cover be fixed in on the static feeler lever.

In some embodiments of the present application, the third bending portion set up in increase magnetism subassembly below, the both sides of third bending portion are formed with the lug that extends towards the outside respectively, the lug protrusion in the outside of quiet feeler lever for be connected with the arc extinguishing subassembly.

In some embodiments of the present application, the second arc isolation part is provided with two arc isolation plates, two arc isolation plates are arranged at intervals on two sides of the accommodating space, one end of each arc isolation plate extends to the lower part of the magnetism increasing component, and the other end extends to the upper part of the stationary contact.

In some embodiments of the present application, the second separates the arc portion towards one side of static feeler lever second end is provided with two first limiting plates of interval distribution, two first limiting plates are followed respectively towards the direction of static feeler lever second end extends, and two limiting plates set up respectively in the both sides of magnetism increasing subassembly.

The second arc-isolating part is provided with a second limiting plate towards one side of the second end of the static contact rod, at least one second limiting plate is arranged below each first limiting plate, and the bottom of the second limiting plate is connected with the first arc-isolating part.

Still another aspect of the present application discloses a circuit breaker, the circuit breaker includes:

contact system: the contact system comprises a movable contact assembly and a fixed contact assembly, wherein a movable contact of the movable contact assembly is matched with a fixed contact of the fixed contact assembly;

the arc extinguishing system comprises an arc extinguishing assembly, wherein the arc extinguishing assembly is connected to an arc isolation cover of the static contact assembly to form an arc extinguishing chamber, and a movable contact of the movable contact assembly and a static contact of the static contact assembly are arranged in the arc extinguishing chamber.

The beneficial effects are that:

the application provides a static contact assembly of a circuit breaker, the static contact assembly includes a static contact rod, a static contact, an arc isolation cover and a magnetism increasing assembly, the static contact is arranged on the first end of the static contact rod, a containing space is formed on the arc isolation cover, the first end of the static contact rod is penetrated in the containing space, and the magnetism increasing assembly is arranged in a bending space formed by the static contact rod, so that the magnetism increasing assembly is positioned below the static contact, the magnetic field distribution intensity around the static contact can be enhanced through the magnetism increasing assembly, the electric arc repulsive force effect around the static contact is improved, and the arc isolation cover can generate an arc striking effect on one side of the bending space towards the second end of the static contact rod, so that current can move towards the second end direction of the static contact rod quickly, and the breaking capacity of the circuit breaker contact is improved; the static contact assembly is simple in structure and low in production cost.

The application also provides a circuit breaker, which is provided with the fixed contact assembly and has all the advantages of the fixed contact assembly.

Drawings

Fig. 1 is a schematic structural diagram of a static contact assembly according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a static contact assembly according to another embodiment of the present application.

Fig. 3 is a schematic structural diagram of a static contact assembly according to another embodiment of the present application.

Fig. 4 is a schematic structural diagram of a static contact assembly according to another embodiment of the present application.

Fig. 5 is a schematic diagram of a connection structure between a static contact rod and a magnetism enhancing component according to an embodiment of the present application.

Fig. 6 is a schematic diagram of a connection structure between a static contact rod and a magnetism enhancing component according to another embodiment of the present application.

Fig. 7 is a schematic diagram of a connection structure between a static contact rod and a magnetism enhancing component according to another embodiment of the present application.

Fig. 8 is a schematic structural diagram of a magnetism enhancing component according to an embodiment of the present application.

Fig. 9 is a schematic structural diagram of an arc isolation cover according to an embodiment of the present application.

Fig. 10 is a schematic structural view of an arc isolation cover according to another embodiment of the present disclosure.

Description of main reference numerals: 1. a static touch rod; 11. bending space; 12. a second connection hole; 2. an arc isolation cover; 21. an accommodating space; 22. a first opening; 23. a second opening; 24. a first arc-separating part; 241. a first bending part; 2411. a first connection hole; 242. a second bending part; 243. a third bending part; 2431. a bump; 25. a second arc-separating part; 251. arc-shield plate; 252. a first limiting plate; 253. a second limiting plate; 3. a magnetism increasing component; 31. a magnetic increasing sheet; 311. a first magnetic increasing sheet; 312. a second magnetic increasing sheet; 32. a connecting piece; 4. and a stationary contact.

Detailed Description

The application provides a circuit breaker and fixed contact assembly thereof, in order to make the purpose, technical scheme and effect of the application clearer and more definite, the application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

In the description of the present application, it should be understood that the terms "upper," "lower," "left," "right," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description of the present application and for simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, as well as a specific orientation configuration and operation, and therefore, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

A circuit breaker is a switching device capable of closing, carrying and opening a current under normal circuit conditions and capable of closing, carrying and opening a current under abnormal circuit conditions for a prescribed time. When faults such as serious overload or circuit breaking occur in the circuit, the circuit breaker can automatically cut off the circuit, so that the expansion of accidents is prevented, and the safe operation is ensured. Therefore, the breaking capacity of the circuit breaker is an important index for judging the quality of the circuit breaker.

The application provides a circuit breaker, this circuit breaker includes contact system and connects the arc extinguishing system that makes on contact system, contact system includes moving contact subassembly and static contact subassembly, moving contact subassembly includes moving feeler lever and sets up the moving contact on this moving feeler lever, the static contact subassembly includes moving feeler lever 1, moving contact 4, separate arc cover 2 and add magnetic assembly 3, moving contact 4 sets up on the first end of moving feeler lever 1, correspond the setting with moving contact of moving contact subassembly, moving contact of moving contact subassembly and moving contact 4 of moving contact subassembly mutually support, can contact each other and form the electric path, perhaps separate the disconnect circuit each other. The arc extinguishing system comprises an arc extinguishing component which is connected to the arc isolation cover 2, an arc extinguishing chamber is formed towards one side of the fixed contact 4, and the fixed contact 4 and the movable contact are mutually matched in the arc extinguishing chamber. Specifically, the arc extinguishing subassembly includes arc extinguishing bars piece and arc extinguishing bars piece mounting panel, and arc extinguishing bars piece mounting panel disposes two, connects respectively on separating arc cover 2, and two arc extinguishing bars piece mounting panel intervals set up in two of magnetizing assembly 3, and the arc extinguishing bars piece is provided with the polylith, and polylith arc extinguishing bars piece joint respectively on two arc extinguishing bars piece sets up between two arc extinguishing bars piece mounting panel, and polylith arc extinguishing bars piece is along the setting of breaking direction range upon range of moving contact subassembly and static contact subassembly, and leaves the clearance between two adjacent arc extinguishing bars piece. The static contact assembly is simple in structure and low in production cost. In addition, by arranging the magnetism increasing component 3 below the fixed contact 4, the distribution intensity of the magnetic field around the fixed contact 4 can be increased, the effect of electric arc repulsive force between the fixed contact 4 and the movable contact is improved, and the breaking capacity of the circuit breaker contact is improved.

Specifically, referring to fig. 1 to 4, the static contact assembly of the circuit breaker provided by the application includes a static contact rod 1, a static contact 4, an arc isolation cover 2 and a magnetism increasing assembly 3, wherein the static contact rod 1 is bent to form a bending space 11, one end of the static contact rod 1 along the extending direction is set as a first end, the other end of the static contact rod 1 along the extending direction is set as a second end, the static contact 4 is set on the first end of the static contact rod 1, a containing space 21 is formed on the arc isolation cover 2, the first end of the static contact rod 1 is penetrated into the containing space 21 from one side of the arc isolation cover 2, which is away from the magnetism increasing assembly 3, the magnetism increasing assembly 3 is penetrated into the containing space 21 and is connected with the first end of the static contact rod 1, and the magnetism increasing assembly 3 is located in the bending space 11, so that the magnetism increasing assembly 3 is located below the static contact 4; the fixed contact 4 adopts a silver contact, and can be combined with a movable contact on the movable contact assembly to form an electric path or disconnected with a movable contact on the movable contact assembly to form an open circuit. The magnetism increasing component 3 can enhance the magnetic field distribution intensity around the fixed contact 4 and improve the electric repulsive force effect of the electric arc around the fixed contact, thereby improving the breaking capacity of the circuit breaker. The arc isolation cover 2 has a certain insulation effect on the magnetism increasing component 3 and the outside, so that the electric arc can move along a given direction, and the magnetism increasing effect is ensured.

As shown in fig. 5 to 7, the magnetism increasing assembly 3 includes a plurality of stacked magnetism increasing sheets 31, the plurality of magnetism increasing sheets 31 being connected together by a connecting member 32; the magnetic increasing piece 31 is provided with at least one through hole, and the connecting piece 32 passes through the through holes on the magnetic increasing pieces 31 to connect the magnetic increasing pieces 31 together. Preferably, the through hole on one of the magnetic increasing sheets 31 positioned at the outer side is provided as a counter bore, and the connecting piece 32 is a counter bore screw or rivet. In this way, the end of the connecting piece 32 can be completely placed in the counter bore, the surface integrity of the magnetism increasing component 3 is improved, and the layout between the magnetism increasing component 3 and the arc isolation cover 2 is facilitated. The magnetism increasing component 3 is affected by the magnetic field, and an electronic vortex is generated in the magnetism increasing component, so that the temperature of the magnetism increasing component 3 is increased, and the magnetism gathering effect of the magnetism increasing component is affected. The larger the volume of the magnetism increasing component 3 is, the more obvious the temperature rising effect is, and the larger the influence on the magnetic gathering capability is. In this application, through with increasing magnetism subassembly 3 partition and become by multi-disc magnetism increasing sheet 31 constitution, reduced the thickness of single magnetism increasing body to reduce the inside electron vortex of single magnetism increasing body and to its influence of temperature rise, reduced the influence of magnetic field to magnetism subassembly 3 and gathered the magnetism effect.

As shown in fig. 6 and 8, the magnetic increasing piece 31 includes a first magnetic increasing piece 311 and a second magnetic increasing piece 312, the first magnetic increasing piece 311 is provided with at least two pieces, the second magnetic increasing piece 312 is provided with at least two pieces, at least two pieces of the second magnetic increasing piece 312 are respectively provided at two opposite sides of the first magnetic increasing piece 311, and the lamination direction of the magnetic increasing piece 31 is perpendicular to the extension direction of the second end of the static contact rod 1, and one side of the first magnetic increasing piece 311 facing the second end of the static contact rod 1 extends upwards to the upper surface of the protruding static contact rod 1. When the static contact subassembly in this application connects the arc extinguishing subassembly, the arc extinguishing subassembly sets up in the one side of static contact 4 towards static contact pole 1 second end, and first magnetic increasing sheet 311 extends to the front side of static contact 4 in the one side of static contact 4 towards static contact pole 1 second end for first magnetic increasing sheet 311 forms the striking structure at the front side of static contact 4, has improved the speed that current around the static contact 4 moved to the arc extinguishing chamber, thereby further improves the breaking capacity of circuit breaker contact. It will be appreciated that the magnetic-increasing sheets 31 may be stacked in other directions, as long as the stacked magnetic-increasing assembly 3 is capable of forming an arc striking structure protruding from the surface of the stationary contact rod 1 on the side of the stationary contact 4 facing the second end of the stationary contact rod 1.

As shown in fig. 5 to 7, 9 and 10, the second end of the static contact bar 1 forms a straight plate connection part, the arc isolation cover 2 is respectively provided with a first opening 22 and a second opening 23 which are communicated with the accommodating space 21, the first opening 22 faces the second end of the static contact bar 1, the second opening 23 is arranged at the bottom of the accommodating space 21, the first end of the static contact bar 1 penetrates into the accommodating space 21 from the second opening 23 and penetrates out of the first opening 22, and the static contact 4 is arranged on the upper surface of the first end of the static contact bar 1. The static contact rod 1 is buckled and is formed the bending part of U type, the space 11 of buckling forms in this bending part, the U type opening direction of this U type bending part is towards the second end of static contact rod 1, in the aforesaid, the upper portion and the lower part of U type bending part are separated by separating arc cover 2, separate the arc cover 2 and adopt insulating material preparation, so, separate the effect that arc cover 2 can form insulating arc around static contact 4, combine with magnetizing assembly 3, make the electric arc around the static contact 4 only remove towards the direction of arc extinguishing chamber, improve the arc extinguishing effect, avoid the movable contact of circuit breaker and static contact 4 by the excessive burning of electric arc.

As shown in fig. 9 and 10, the arc isolation cover 2 includes a first arc isolation part 24 and a second arc isolation part 25, the first arc isolation part 24 is disposed below the magnetism increasing component 3 and is located in the bending space 11 and is connected with the static contact rod 1, and a first end of the first arc isolation part 24 extends towards a second end of the static contact rod 1; the second arc-isolating part 25 is connected with the second end of the first arc-isolating part 24, and the upper end of the second arc-isolating part 25 extends to the upper side of the stationary contact 4, and the accommodating space 21 is arranged in the second arc-isolating part 25. The first arc isolation part 24 forms an arc insulation effect below the fixed contact 4 and the magnetism increasing component 3, and the second arc isolation part 25 forms an insulation arc effect behind and on two sides of the fixed contact 4 and the magnetism increasing component 3, so that the arc can only move towards the arc extinguishing chamber, the arc extinguishing effect is enhanced, and the burning degree of the fixed contact 4 of the circuit breaker by the arc is reduced.

Further, the first arc-isolating portion 24 includes a first bending portion 241, a second bending portion 242 and a third bending portion 243 which are sequentially arranged, the second bending portion 242 is respectively connected with the first bending portion 241 and the third bending portion 243 in a bending manner, the first bending portion 241 and the third bending portion 243 extend towards opposite directions, the first bending portion 241 covers the second end of the static contact rod 1 and does not completely cover the second end of the static contact rod 1, so that a sufficient wiring space is left on the second end of the static contact rod 1; the first bending portion 241 is provided with a first connecting hole 2411, the static contact rod 1 is provided with a second connecting hole 12, and the first connecting hole 2411 and the second connecting hole 12 are correspondingly connected to fix the arc isolation cover 2 on the static contact rod 1, so as to ensure the connection stability of the static contact rod 1 and the arc isolation cover 2. The second bending portion 242, the third bending portion 243 and the static contact rod 1 are connected in the bending space 11, and the third bending portion 243 covers the portion of the static contact rod 1 located below the magnetism increasing component 3, so that after the static contact component is connected with the arc extinguishing component, the first arc isolating portion 24 can form an insulated arc under the arc extinguishing component.

As shown in fig. 2 and 9, the third bending portion 243 is disposed below the magnetism increasing component 3, two sides of the third bending portion 243 are respectively formed with a protruding block 2431 extending towards the outer side, the protruding block 2431 protrudes out of the static contact rod 1 and is used for being connected with an arc extinguishing component, the lower portion of the arc extinguishing component is clamped with the protruding block 2431 of the third bending portion 243, and connection convenience of the arc extinguishing component and an arc extinguishing cover is improved.

The second arc isolation part 25 is provided with two arc isolation plates 251, the two arc isolation plates 251 are arranged at two sides of the accommodating space 21 at intervals, one end of each arc isolation plate 251 extends to the lower part of the magnetism increasing component 3, the other end extends to the upper part of the fixed contact 4, the arc isolation plates 251 form an insulated arc space at the rear and two sides of the fixed contact 4 and the magnetism increasing component 3, the moving direction of the arc is limited, the arc isolation plates 251 extend to two sides of the fixed contact rod 1, enough connecting space is formed between the arc extinguishing component and the arc isolation plates 251, and the arrangement of each component is facilitated.

Two first limiting plates 252 which are distributed at intervals are arranged on one side of the second arc isolation part 25, which faces the second end of the static contact rod 1, the two first limiting plates 252 extend along the direction which faces the second end of the static contact rod 1 respectively, and the two limiting plates 252 are arranged on two sides of the magnetism increasing assembly 3 respectively; the side of the second arc-isolating part 25 facing the second end of the static contact rod 1 is also provided with a second limiting plate 253, at least one second limiting plate 253 is arranged below each first limiting plate 252, and the bottom of the second limiting plate 253 is also connected with the first arc-isolating part 24. The first limiting plate 252 and the second limiting plate 253 can limit the two sides of the magnetism increasing component 3, the first limiting plate 252 extends to the upper portion of the second magnetism increasing piece 312 and can be matched with the arc extinguishing component, and an arc extinguishing channel is formed between the fixed contact and the movable contact. The first limiting plate 252, the limiting block 253 and the accommodating space 21 can limit the magnetism increasing component 3 and the static contact rod 1 in three directions, and an arc isolation effect can be formed in the three directions of the magnetism increasing component 3, so that an arc generated around the static contact 4 can move towards the arc extinguishing cavity, and the arc extinguishing effect is improved.

Further, the second arc isolation part 25 is of an integrally formed structure, and further, the first arc isolation part 24 and the second arc isolation part 25 are integrally formed, so that the integrity of the arc extinguishing chamber 2 is improved, and the insulation effect of the arc extinguishing chamber is improved.

Another aspect of the present application also discloses a circuit breaker including a stationary contact assembly, and an arc extinguishing assembly connected to an arc isolation cover 2 of the stationary contact assembly. The structure of the static contact assembly is described in any one of the above, and will not be described in detail herein. Arc extinguishing component joint separates on the lug 2431 that the arc cover 2 separates two of arc portion 24 first, forms and separates the arc chamber, separates the arc cover 2 and forms insulating arc's separation effect in the position that the magnetism subassembly 3 was separated the arc chamber dorsad, and magnetism subassembly 3 can strengthen the magnetic field around the stationary contact 4 to form the striking structure in the position that stationary contact 4 is towards the arc chamber, make the electric current around the stationary contact 4 can accelerate towards the arc chamber removal, improve the breaking capacity of current breaker movable contact and stationary contact 4.

To sum up, this application is through setting up the magnetism increasing subassembly 3 in the below of stationary contact 4 to set up at the one end that stationary contact 4 was connected to stationary contact pole 1 and separate arc cover 2, form insulating effect through separating arc cover 2, make the electric current that forms around stationary contact 4 can only follow the established direction and remove, magnetism increasing subassembly 3 has strengthened the magnetic field intensity around stationary contact 4, thereby improve the electric repulsion effect between moving contact and the stationary contact 4, improve the breaking capacity between moving contact and the stationary contact 4.

The magnetism increasing component 3 is formed by stacking the first magnetism increasing piece 311 and the second magnetism increasing piece 312, so that the thickness of a single magnetism increasing body forming the magnetism increasing component 3 is reduced, and the influence of electronic eddy current on the temperature rise of the magnetism increasing body is reduced.

The first magnetic increasing sheet 311 forms an arc striking structure at one side of the stationary contact 4, which faces the second end of the stationary contact rod 1, so that the arc moves towards the stationary contact 4, which faces the second end of the stationary contact rod 1, namely moves towards the arc extinguishing chamber, and the arc extinguishing effect is improved.

It will be understood that equivalents and modifications will occur to persons skilled in the art and may be made in accordance with the present utility model and its application and spirit, and all such modifications and substitutions are intended to be included within the scope of the following claims.

Claims

1. A stationary contact assembly of a circuit breaker, comprising:

the fixed contact is arranged on the first end of the fixed contact rod;

2. The stationary contact assembly of a circuit breaker of claim 1, wherein the magnetically enhanced assembly comprises a plurality of stacked magnetically enhanced pieces, the plurality of magnetically enhanced pieces being connected together by a connector.

3. The fixed contact assembly of the circuit breaker according to claim 2, wherein the magnetic increasing pieces comprise a first magnetic increasing piece and a second magnetic increasing piece, the first magnetic increasing piece is at least provided with two pieces, the second magnetic increasing piece is at least provided with two pieces, the at least two pieces of the second magnetic increasing piece are respectively arranged at two opposite sides of the first magnetic increasing piece, and the stacking direction of the magnetic increasing pieces is perpendicular to the extending direction of the second end of the fixed contact rod;

4. The stationary contact assembly of claim 1, wherein the arc shield is provided with a first opening and a second opening, respectively, in communication with the accommodation space, the first opening is toward the second end of the stationary contact rod, the second opening is disposed at the bottom of the accommodation space, the first end of the stationary contact rod penetrates into the accommodation space from the second opening and passes out of the first opening, and the stationary contact is disposed on the upper surface of the first end of the stationary contact rod.

5. The stationary contact assembly of a circuit breaker of claim 4, wherein the arc blocking cover comprises:

6. The stationary contact assembly of claim 5, wherein the first arc-isolating portion comprises a first bent portion, a second bent portion and a third bent portion, which are sequentially arranged, the second bent portion is respectively connected with the first bent portion and the third bent portion in a bent manner, the first bent portion covers the second end of the stationary contact rod, a first connecting hole is formed in the first bent portion, a second connecting hole is formed in the stationary contact rod, and the first connecting hole and the second connecting hole are correspondingly connected to fix the arc-isolating cover on the stationary contact rod.

7. The stationary contact assembly of claim 6, wherein the third bending portion is disposed below the magnetism increasing assembly, and two sides of the third bending portion are respectively formed with a protruding block extending towards the outer side, and the protruding block protrudes out of the stationary contact rod and is used for being connected with an arc extinguishing assembly.

8. The fixed contact assembly of claim 5, wherein the second arc isolation part is provided with two arc isolation plates, the two arc isolation plates are arranged at two sides of the accommodating space at intervals, one ends of the two arc isolation plates extend to the lower side of the magnetism increasing assembly, and the other ends extend to the upper side of the fixed contact.

9. The fixed contact assembly of the circuit breaker according to claim 8, wherein one side of the second arc isolation part facing the second end of the fixed contact rod is provided with two first limiting plates which are distributed at intervals, the two first limiting plates extend along the direction facing the second end of the fixed contact rod, and the two limiting plates are arranged on two sides of the magnetism increasing assembly;

10. A circuit breaker, comprising:

a contact system comprising a moving contact assembly as claimed in any one of claims 1 to 9, the moving contact of the moving contact assembly cooperating with the stationary contact of the stationary contact assembly;