Contact assembly and circuit breaker

Abstract

The utility model discloses a contact assembly and a circuit breaker, the contact assembly is used for controlling the on-off of the circuit breaker and is electrically connected with an arc extinguishing assembly of the circuit breaker, the contact assembly comprises a static contact assembly, the static contact assembly comprises a plurality of static contacts, and each static contact comprises a static main contact and an arc striking sheet which are electrically connected; the moving contact assembly is arranged to be in contact with or separated from the static contact assembly, the moving contact assembly comprises at least one first moving contact and a plurality of second moving contacts, the first moving contact comprises a first main contact and a first arc contact which are connected, the first arc contact is provided with a first contact part, the second moving contact is provided with a second main contact, and the second main contact is provided with a second contact part. The second main contact is electrically connected with the first main contact, and under the closing state of the circuit breaker, the first contact part is in contact with the arc striking sheet, and the second contact part is in contact with the static main contact. According to the contact assembly and the circuit breaker, the contact between the arc contact and the static contact can be ensured when the circuit breaker is in a closed state, and the breaking failure of the circuit breaker is avoided.

Description

Technical Field

[0001] The present application belongs to the technical field of electrical equipment, and in particular, relates to a contact assembly and a circuit breaker. Background Art

[0002] In a traditional circuit breaker structure, there are usually contact assemblies, gas generating parts and arc extinguishing grids. The arc generated by the disconnection of the moving contact and the stationary contact of the contact assembly can enter the arc extinguishing grid through the gas generating parts for arc extinguishing.

[0003] The moving contact of the contact assembly usually includes a main contact and an arc contact. The main contact can bear the long-term current passing through when the switch is closed, and the arc contact generates an arc when disconnected. However, the arc contact will gradually wear out under the action of the arc. When it wears to a certain extent, there will be a gap between the arc contact and the static contact in the closed state, so that only the main contact and the static contact are in contact. This situation will cause an arc to be generated at the main contact, and the gas-generating parts will hinder the arc from moving toward the arc-extinguishing grid, causing the arc to continue to burn at the main contact, resulting in a disconnection failure. Utility Model Content

[0004] The present application provides a contact assembly and a circuit breaker, which can ensure the contact between the arc contact and the stationary contact when the circuit breaker is in a closed state, thereby avoiding the circuit breaker from breaking failure.

[0005] The present application provides a contact assembly, which is used to control the on and off of a circuit breaker and is electrically connected to the arc extinguishing assembly of the circuit breaker. The contact assembly includes: a static contact assembly, including multiple static contacts, the static contacts include electrically connected static main contacts and arc-striking pieces; a moving contact assembly, which is configured to be in contact with or separated from the static contact assembly, the moving contact assembly includes at least one first moving contact and multiple second moving contacts, the first moving contact includes a first main contact and a first arc contact connected to each other, the first arc contact has a first contact portion, the second moving contact has a second main contact, and the second main contact has a second contact portion. In the closed state of the circuit breaker, the first contact portion is configured to be in contact with the arc-striking piece, and the second contact portion is configured to be in contact with the static main contact.

[0006] In the contact assembly as above, the first contact portion is protruding from a surface of the first arc contact facing the arc-starting piece, and the second contact portion is protruding from a surface of the second main contact facing the static main contact.

[0007] In the contact assembly as above, along the direction from the moving contact assembly to the stationary contact assembly, the thickness of the first contact portion is greater than the thickness of the second contact portion.

[0008] In the above contact assembly, the first contact portion and the second contact portion are made of silver metal or silver alloy material.

[0009] In the contact assembly as above, the static main contact has a third contact portion, the arc striking piece has a fourth contact portion, and in the closed state of the contact assembly, the third contact portion is in contact with the second contact portion, and the fourth contact portion is in contact with the first contact portion.

[0010] In the contact assembly as above, the first main contact has a avoidance portion, which is recessed on the surface of the first main contact facing the stationary main contact, and is arranged opposite to the third contact portion for avoiding the third contact portion.

[0011] The contact assembly as above, wherein, further comprises: a partition, which is connected to both the static contact assembly and the moving contact assembly, the fourth contact portion and the first contact portion are both arranged on the side of the partition facing the arc extinguishing assembly, and the third contact portion and the second contact portion are both arranged on the side of the partition away from the arc extinguishing assembly.

[0012] On the other hand, the present application also provides a circuit breaker, which includes the above-mentioned contact assembly, and the circuit breaker also includes an arc extinguishing assembly and a gas generating assembly, and the gas generating assembly is arranged between the contact assembly and the arc extinguishing assembly.

[0013] As in the circuit breaker above, the gas-producing assembly includes two gas-producing parts, which are arranged at intervals to form an arc discharge channel, a plurality of first arc contacts and a plurality of arc-starting pieces corresponding to the first arc contacts are arranged inside the arc discharge channel, and the static main contact and the second main contact are arranged on the side of the gas-producing part away from the arc extinguishing assembly.

[0014] As above, the circuit breaker further includes a plurality of first elastic members and a plurality of second elastic members, the first elastic members and the second elastic members are both connected to a side of the moving contact assembly away from the static contact assembly, the plurality of first elastic members are arranged in a one-to-one correspondence with the plurality of first moving contacts, the plurality of second elastic members are arranged in a one-to-one correspondence with the plurality of second moving contacts, and the elastic force of the first elastic members is greater than the elastic force of the second elastic members.

[0015] The contact assembly of the present application is used to control the on and off of the circuit breaker. The contact assembly includes a static contact assembly and a moving contact assembly. The static contact assembly includes a plurality of static contacts. The static contact includes an electrically connected static main contact and an arc-striking piece. The moving contact assembly includes at least one first moving contact and a plurality of second moving contacts. The first moving contact can contact the arc-striking piece through the first contact portion of its first arc contact, and the second moving contact can contact the static main contact through the second contact portion of its second main contact, which ensures that the second main contact of the second moving contact can It can be in contact with the static main contact, and ensures that the first arc contact of the first moving contact and the arc-striking piece are in contact, the first main contact of the first moving contact will never be in contact with the static main contact, and after the first contact portion of the first arc contact is worn, it can still be in contact with the arc-striking piece. Therefore, when the circuit breaker is disconnected, the first arc contact is separated from the arc-striking piece, and the arc is generated at the first arc contact and the arc-striking piece, but not at the first main contact, which avoids the arc from continuously burning at the first main contact, thereby avoiding the breaking failure of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 This is a schematic diagram of the overall structure of the contact assembly of an embodiment of the present application;

[0018] Figure 2 This is a schematic diagram of the overall structure of a circuit breaker according to an embodiment of the present application;

[0019] Figure 3 A schematic diagram of a second main contact of a contact assembly according to an embodiment of the present application;

[0020] Figure 4 A schematic diagram of a first moving contact of a contact assembly according to an embodiment of the present application;

[0021] Figure 5 Schematic diagram of an arc-starting piece of a contact assembly according to an embodiment of the present application.

[0022] Description of Figure Numbers:

[0023] 10. Stationary contact assembly; 11. Stationary contact; 111. Stationary main contact; 112. Arcing piece; 113. Third contact portion; 114. Fourth contact portion; 20. Moving contact assembly; 21. First moving contact; 211. First main contact; 212. First arcing contact; 213. First contact portion; 214. Avoidance portion; 22. Second moving contact; 221. Second main contact; 222. Second contact portion; 30. Partition plate;

[0024] 100, contact assembly; 200, arc extinguishing assembly; 300, gas producing assembly; 310, gas producing part; 320, arc discharge channel; 400, mounting groove. DETAILED DESCRIPTION

[0025] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0026] like Figures 1 to 5 As shown, an embodiment of the present application provides a contact assembly, which is used to control the on and off of a circuit breaker and is electrically connected to an arc extinguishing assembly 200 of the circuit breaker. The contact assembly 100 includes: a static contact assembly 10, including a plurality of static contacts 11, the static contact 11 including an electrically connected static main contact 111 and an arc-striking piece 112; a moving contact assembly 20, which is arranged to be in contact with or separated from the static contact assembly 10, and the moving contact assembly 20 includes at least one first moving contact 21 and a plurality of second moving contacts 22, the first moving contact 21 including a first main contact 211 and a first arc contact 212 connected to each other, the first arc contact 212 having a first contact portion 213, the second moving contact 22 having a second main contact 221, the second main contact 221 having a second contact portion 222, and in the closed state of the circuit breaker, the first contact portion 213 is arranged to be in contact with the arc-striking piece 112, and the second contact portion 222 is arranged to be in contact with the static main contact 111.

[0027] In a specific implementation, the contact assembly of the embodiment of the present application is used to control the on and off of the circuit breaker. The contact assembly 100 includes a static contact assembly 10 and a moving contact assembly 20. The static contact assembly 10 includes a plurality of static contacts 11. The static contact 11 includes a static main contact 111 and an arc-striking piece 112. The moving contact assembly 20 includes at least one first moving contact 21 and a plurality of second moving contacts 22. The first moving contact 21 can be in contact with the arc-striking piece 112 through the first contact portion 213 of its first arc contact 212, and the second moving contact 22 can be in contact with the static main contact 111 through the second contact portion 222 of its second main contact 221. The contact setting ensures that the second main contact 221 of the second moving contact 22 can be in contact with the static main contact 111. When the circuit breaker is in the closed state, the current can pass through the connected second main contact 221 and the static main contact 111 for a long time. Moreover, since the first moving contact 21 and the second moving contact 22 are simultaneously connected to the connecting busbar by means of soft connection, the current in the second main contact 221 can flow through the first main contact 211, so that the first main contact 211, the second main contact 221 and the static main contact 111 can jointly bear most of the current that passes through for a long time when the circuit breaker is closed.

[0028] The contact assembly of the embodiment of the present application is provided with an arc-striking piece 112 electrically connected to the static main contact 111, and the first arc contact 212 is able to contact the arc-striking piece 112, so that the arc-striking piece 112 can have the function of a static arc contact. When the first arc contact 212 of the first moving contact 21 is in contact with the arc-striking piece 112, the first main contact 211 of the first moving contact 21 will never contact the static main contact 111, and after the first contact portion 213 of the first arc contact 212 is worn, it can still contact the arc-striking piece 112, so when the circuit breaker is disconnected, the first arc contact 212 is separated from the arc-striking piece 112, and the arc will be generated at the first arc contact 212 and the arc-striking piece 112, but not at the first main contact 211, so that the arc is prevented from continuously burning at the first main contact 211, thereby preventing the circuit breaker from failing to disconnect.

[0029] Moreover, the arc-striking piece 112 also has an arc-striking function. One end of the arc-striking piece 112 is electrically connected to the arc extinguishing assembly 200. The arc generated between the arc-striking piece 112 and the first arc contact 212 can enter the arc extinguishing assembly 200 for arc extinguishing under the arc-striking action of the arc-striking piece 112 itself, so that the arc will not be retained between the arc-striking piece 112 and the first arc contact 212, thereby improving the overall arc extinguishing effect of the circuit breaker.

[0030] It should be noted that, usually, the arc contact part in the circuit breaker is arranged in the channel of the gas-producing material, so that the arc generated by the separation of the arc contact part can contact the gas-producing material. After the gas-producing material generates gas, it will push the arc into the arc extinguishing chamber. However, the main contact part in the circuit breaker is usually arranged outside the gas-producing material. Therefore, most of the generated arc cannot be affected by the thrust of the gas generated by the gas-producing material, and thus cannot enter the arc extinguishing chamber for arc extinguishing. In an embodiment of the present application, the first arc contact 212 and the arc-starting plate 112 are both arranged in the arc discharge channel 320 between the two gas-producing parts 310, and the first main contact 211, the second main contact 221 and the static main contact 111 are arranged outside the arc discharge channel 320. Therefore, if an arc is generated at the first main contact 211, the second main contact 221 and the static main contact 111, it will not be able to enter the arc extinguishing assembly 200, thereby causing the arc to continue to burn at the first main contact 211, the second main contact 221 and the static main contact 111, resulting in the failure of the circuit breaker to disconnect.

[0031] like Figure 1 and Figure 3 As shown, in the contact assembly of the embodiment of the present application, the first contact portion 213 is protruded from the surface of the first arc contact 212 facing the arc-starting piece 112 , and the second contact portion 222 is protruded from the surface of the second main contact 221 facing the static main contact 111 .

[0032] In a specific implementation, the protruding setting of the first contact portion 213 and the second contact portion 222 enables the first arc contact 212 to contact the arc-starting piece 112 only through the first contact portion 213, and the second main contact 221 to contact the static main contact 111 only through the second contact portion 222 when the moving contact assembly 20 moves toward the static contact assembly 10. Moreover, the protruding first contact portion 213 and the second contact portion 222 both have a certain thickness. When an arc is generated and ablation occurs at the first contact portion 213 and the second contact portion 222, the thickness of the first contact portion 213 and the second contact portion 222 can still ensure the protruding setting of the two, thereby ensuring that the moving contact assembly 20 can always be in contact with and connected to the static contact assembly 10 when the circuit breaker is in the closed state.

[0033] like Figure 1 and Figure 3 As shown, in the contact assembly of the embodiment of the present application, along the direction from the movable contact assembly 20 to the stationary contact assembly 10 , the thickness of the first contact portion 213 is greater than the thickness of the second contact portion 222 .

[0034] In specific implementation, the thickness of the first contact portion 213 is greater than the thickness of the second contact portion 222, so that when the moving contact assembly 20 moves toward the static contact assembly 10, the first contact portion 213 can first contact the arc-striking piece 112. When the first contact portion 213 is compressed to a certain thickness by the arc-striking piece 112, the second contact portion 222 contacts the static main contact 111, thereby completing the closing of the circuit breaker; in the process of the moving contact assembly 20 moving away from the static contact assembly 10, since the thickness of the second contact portion 222 is smaller and the deformation occurring during closing is smaller, it can be in a state of being separated from the static contact assembly 10 earlier than the first contact portion 213. After the second contact portion 222 is separated from the static main contact 111 by a certain distance, the first contact portion 213 can be separated from the arc-striking piece 112, thereby completing the opening of the circuit breaker. Therefore, the thickness setting of the first contact portion 213 and the second contact portion 222 can ensure the characteristic of the first arc contact 212 to close first and then open, so that when the circuit breaker is opened, the arc can be generated by the first arc contact 212 instead of the second main contact 221, thereby avoiding the arc from continuing to burn at the second main contact 221, thereby avoiding the circuit breaker's breaking failure.

[0035] like Figure 1 and Figure 3 As shown, in the contact assembly of the embodiment of the present application, the first contact portion 213 and the second contact portion 222 are made of silver metal or silver alloy material.

[0036] In specific implementation, silver metal or silver alloy material has a high current-carrying capacity, which can ensure stable passage of electric arc in the first contact portion 213 and the second contact portion 222, and the arc causes less wear on the silver metal or silver alloy material, ensuring that the first contact portion 213 and the second contact portion 222 will not produce significant wear, thereby ensuring that the first contact portion 213 and the second contact portion 222 can make contact earlier than.

[0037] like Figure 1 and Figure 3 As shown, the contact assembly of the embodiment of the present application, wherein the static main contact 111 has a third contact portion 113, the arc-starting piece 112 has a fourth contact portion 114, and when the contact assembly 100 is in the closed state, the third contact portion 113 is in contact with the second contact portion 222, and the fourth contact portion 114 is in contact with the first contact portion 213.

[0038] In a specific implementation, the setting of the third contact portion 113 and the fourth contact portion 114 can avoid overall contact between the first arc contact 212 and the arc-starting piece 112, and between the second main contact 221 and the static main contact 111. The moving contact assembly 20 and the static contact assembly 10 are in contact through the contact points, which can enhance the current passing effect and make it easier to separate the moving contact assembly 20 and the static contact assembly 10, thus avoiding the generation of a longer arc.

[0039] Specifically, the third contact portion 113 and the fourth contact portion 114 are both protruding on their respective contacts toward the moving contact assembly 20, and the third contact portion 113 and the fourth contact portion 114 are both made of silver metal or silver alloy material, which improves the current carrying capacity of the third contact portion 113 and the fourth contact portion 114, and is less affected by the arc and is not easily affected by wear.

[0040] The contact assembly of the embodiment of the present application, wherein, Figure 4 As shown, the first main contact 211 has an avoidance portion 214 , which is recessed on the surface of the first main contact 211 facing the stationary main contact 111 , and is arranged opposite to the third contact portion 113 for avoiding the third contact portion 113 .

[0041] In a specific implementation, the setting of the avoidance portion 214 can prevent the first main contact 211 from contacting the third contact portion 113 when the moving contact assembly 20 moves toward the stationary contact assembly 10, thereby preventing the first main contact 211 from contacting the third contact portion 113 so that the first arc contact 212 moves away from the arc-striking piece 112, and preventing the fourth contact portion 114 from being unable to contact the first contact portion 213, so that the first arc contact 212 can achieve a movement process of closing first and then opening, thereby ensuring the overall breaking reliability of the circuit breaker.

[0042] like Figure 1 As shown, the contact assembly of the embodiment of the present application further includes: a partition 30, which is connected to both the static contact assembly 10 and the moving contact assembly 20, the fourth contact portion 114 and the first contact portion 213 are both arranged on the side of the partition 30 facing the arc extinguishing assembly 200, and the third contact portion 113 and the second contact portion 222 are both arranged on the side of the partition 30 away from the arc extinguishing assembly 200.

[0043] In a specific implementation, the partition 30 can prevent the arc generated by the separation of the fourth contact portion 114 and the first contact portion 213 from moving downward to the contact position of the third contact portion 113 and the second contact portion 222, thereby causing a disconnection failure. Under the isolating effect of the partition 30, the arc can all move above the partition 30 and eventually enter the arc extinguishing assembly 200 for arc extinguishing.

[0044] like Figure 2 As shown, an embodiment of the present application further provides a circuit breaker, which includes the above-mentioned contact assembly, and the circuit breaker also includes an arc extinguishing assembly 200 and a gas producing assembly 300, and the gas producing assembly 300 is arranged between the contact assembly 100 and the arc extinguishing assembly 200.

[0045] During specific implementation, the arc generated by the contact assembly 100 can pass through the gas-generating assembly 300. The gas-generating assembly 300 will generate gas under the contact of the arc. The generated gas can drive the arc to move, so that the arc enters the arc extinguishing assembly 200 for arc extinguishing, thereby preventing the arc from being retained in the contact assembly 100 and causing the circuit breaker to fail to disconnect successfully.

[0046] like Figure 2 As shown, a circuit breaker of an embodiment of the present application, wherein a gas producing component 300 includes two gas producing parts 310, and the two gas producing parts 310 are arranged at intervals to form an arc discharge channel 320, a plurality of first arc contacts 212 and a plurality of arc striking pieces 112 corresponding to the first arc contacts 212 are arranged inside the arc discharge channel 320, and a static main contact 111 and a second main contact 221 are arranged on a side of the gas producing part 310 away from the arc extinguishing component 200.

[0047] In specific implementation, the first arc contact 212 and the arc-starting piece 112 are arranged inside the arc discharge channel 320. When an arc is generated, gas can be generated in time inside the arc discharge channel 320 to push the arc into the arc extinguishing assembly 200 for arc extinguishing, thereby improving the arc extinguishing efficiency and avoiding the situation where the arc generated by the first arc contact 212 and the arc-starting piece 112 cannot enter the arc discharge channel 320.

[0048] The circuit breaker of the embodiment of the present application, wherein the circuit breaker also includes a plurality of first elastic members and a plurality of second elastic members, the first elastic members and the second elastic members are both connected to a side of the moving contact assembly 20 away from the static contact assembly 10, the plurality of first elastic members are arranged in a one-to-one correspondence with the plurality of first moving contacts 21, the plurality of second elastic members are arranged in a one-to-one correspondence with the plurality of second moving contacts 22, and the elastic force of the first elastic members is greater than the elastic force of the second elastic members.

[0049] During specific implementation, the first elastic member and the second elastic member with different elastic forces are used to control the movement of the first moving contact 21 and the second moving contact 22 respectively, so that the movement speed and stroke of the first moving contact 21 and the second moving contact 22 can be different, and the elastic force of the first elastic member is greater than the elastic force of the second elastic member, so that the first moving contact 21 can be subjected to a greater thrust and can contact the static contact assembly 10 before the second moving contact 22. When the static contact assembly 10 is separated from the moving contact assembly 20, since the first moving contact 21 is subjected to a greater resistance, it can be separated from the static contact assembly 10 later than the second moving contact 22, thereby realizing the movement process of closing first and then opening, and ensuring the overall breaking reliability of the circuit breaker.

[0050] Specifically, Figure 3 As shown, the circuit breaker has two mounting grooves 400 for mounting the first elastic member and the second elastic member.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0052] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A contact assembly, characterized in that: Used to control the on and off of a circuit breaker, and electrically connected to an arc extinguishing assembly (200) of the circuit breaker, the contact assembly (100) comprising: A stationary contact assembly (10) comprises a plurality of stationary contacts (11), wherein the stationary contacts (11) comprise electrically connected stationary main contacts (111) and arc-starting pieces (112); A moving contact assembly (20) is configured to be in contact with or separated from the stationary contact assembly (10), wherein the moving contact assembly (20) comprises at least one first moving contact (21) and a plurality of second moving contacts (22), wherein the first moving contact (21) comprises a first main contact (211) and a first arc contact (212) connected to each other, wherein the first arc contact (212) has a first contact portion (213), and the second moving contact (22) has a second main contact (221), and the second main contact (221) has a second contact portion (222), and when the circuit breaker is in a closed state, the first contact portion (213) is configured to be in contact with the arc striking piece (112), and the second contact portion (222) is configured to be in contact with the stationary main contact (111).

2. The contact assembly according to claim 1, characterized in that: The first contact portion (213) is protruding from the surface of the first arc contact (212) facing the arc-starting piece (112), and the second contact portion (222) is protruding from the surface of the second main contact (221) facing the static main contact (111).

3. The contact assembly according to claim 2, characterized in that: Along the direction from the moving contact assembly (20) to the stationary contact assembly (10), the thickness of the first contact portion (213) is greater than the thickness of the second contact portion (222).

4. The contact assembly according to claim 1, characterized in that: The first contact portion (213) and the second contact portion (222) are made of silver metal or silver alloy material.

5. The contact assembly according to claim 1, characterized in that: The static main contact (111) has a third contact portion (113), and the arc-starting piece (112) has a fourth contact portion (114). When the contact assembly (100) is in a closed state, the third contact portion (113) is in contact with the second contact portion (222), and the fourth contact portion (114) is in contact with the first contact portion (213).

6. The contact assembly according to claim 5, characterized in that: The first main contact (211) has an avoidance portion (214), and the avoidance portion (214) is recessed on the surface of the first main contact (211) facing the static main contact (111). The avoidance portion (214) is arranged relative to the third contact portion (113) for avoiding the third contact portion (113).

7. The contact assembly according to claim 6, characterized in that: Also includes: A partition (30) is connected to the static contact assembly (10) and the moving contact assembly (20); the fourth contact portion (114) and the first contact portion (213) are both arranged on a side of the partition (30) facing the arc extinguishing assembly (200); and the third contact portion (113) and the second contact portion (222) are both arranged on a side of the partition (30) away from the arc extinguishing assembly (200).

8. A circuit breaker, characterized in that: Comprising the contact assembly as described in any one of claims 1 to 7, the circuit breaker further comprises an arc extinguishing assembly (200) and a gas producing assembly (300), wherein the gas producing assembly (300) is arranged between the contact assembly (100) and the arc extinguishing assembly (200).

9. The circuit breaker according to claim 8, characterized in that: The gas producing component (300) comprises two gas producing parts (310), and the two gas producing parts (310) are arranged at intervals to form an arc discharge channel (320), and a plurality of the first arc contacts (212) and a plurality of arc striking pieces (112) arranged corresponding to the first arc contacts (212) are all arranged inside the arc discharge channel (320), and the static main contact (111) and the second main contact (221) are both arranged on a side of the gas producing part (310) away from the arc extinguishing component (200).

10. The circuit breaker according to claim 8, characterized in that The circuit breaker further comprises a plurality of first elastic members and a plurality of second elastic members, wherein the first elastic members and the second elastic members are both connected to a side of the moving contact assembly (20) away from the stationary contact assembly (10), the plurality of first elastic members are arranged in a one-to-one correspondence with the plurality of first moving contacts (21), the plurality of second elastic members are arranged in a one-to-one correspondence with the plurality of second moving contacts (22), and the elastic force of the first elastic member is greater than the elastic force of the second elastic member.

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