Contact assembly of circuit breaker and circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliances, and particularly discloses a contact assembly of a circuit breaker and the circuit breaker. The contact assembly provided by the utility model comprises the first contact group, and the two first moving contacts of the first contact group are connected in series through the short circuit bar, so that the high-voltage breaking capacity of the circuit breaker is improved; the first contact group and the short circuit bar are arranged in the base, so that the electrical clearance and the creepage distance of the circuit breaker in use are ensured, the circuit breaker is not easy to break down, the current cut-off performance of the circuit breaker is improved, and the aim of effectively protecting the circuit is fulfilled; the short-circuit bar is arranged on the base, the short-circuit bar is inserted into the base, installation and fixation of the short-circuit bar are achieved, the usage amount of parts is reduced, the connecting portion is arranged on the short-circuit bar and connected with the first moving contacts through the soft connecting lines, the two first moving contacts are connected in series, meanwhile, actions of the first moving contacts are not affected, the usage amount of the short-circuit bar is reduced, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a contact assembly of a circuit breaker and a circuit breaker. Background Art

[0002] With the gradual development of the new energy industry market and the increasingly stringent control of the investment cost of combiner boxes and inverter equipment manufacturers, they hope to reduce the cost of equipment by increasing the system voltage. At present, the DC voltage in the low-voltage field will gradually increase from DC1500V to DC3000V, and the rated voltage and breaking capacity of the corresponding DC circuit breakers will also increase accordingly. Therefore, high-voltage DC circuit breakers will become the mainstream products of the new energy industry in the future.

[0003] The biggest difference between AC and DC short-circuit breaking is that DC arc is not easy to extinguish, but the energy is small, while AC arc is easy to extinguish, but the energy is large. At present, the poles of DC circuit breakers can be connected in series in the circuit. Therefore, in order to achieve high-voltage short-circuit breaking and increase the rated working voltage, DC circuit breakers often use a multi-breakpoint external series connection method, which mainly includes four connection methods: connecting two adjacent moving contacts with a conductor; or connecting two static contacts with a conductor; or connecting two adjacent static contacts with a conductor; or connecting a moving contact with an adjacent static contact with a conductor. However, the external series connection structure has the phenomenon of exposed copper busbars, and the electrical clearance and creepage distance are difficult to guarantee in actual use. For high-voltage DC circuit breakers, it is easy to have phase-to-phase breakdown or relative breakdown, which makes the circuit breaker lose the function of cutting off the current and fails to achieve the purpose of protecting the circuit. Utility Model Content

[0004] The utility model aims to provide a contact assembly of a circuit breaker and a circuit breaker, which improves the performance of the circuit breaker in cutting off current and realizes the purpose of effectively protecting the circuit.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] In one aspect, a contact assembly of a circuit breaker is provided, comprising:

[0007] Pedestal;

[0008] A first contact group is arranged in the base, the first contact group comprises a first stationary contact, a second stationary contact and two first moving contacts, the first stationary contact is connected to a first wiring terminal, and the second stationary contact is connected to a second wiring terminal;

[0009] A shorting bar is inserted into the base, and two connecting parts are arranged on the shorting bar at intervals, each of the connecting parts is respectively connected to a soft connecting wire, and the two soft connecting wires are respectively connected to the corresponding first moving contacts.

[0010] As an optional technical solution for the contact assembly of the above-mentioned circuit breaker, the connecting portion is protruding from an edge of the short-circuit row, at least two plug-in slots are provided on the base, the edge of the short-circuit row provided with the connecting portion is plugged into the plug-in slot, and the connecting portion is placed in the base.

[0011] As an optional technical solution for the contact assembly of the above-mentioned circuit breaker, the edge of the short-circuit row convexly provided with the connecting portion is concavely provided with a positioning groove, and the base is provided with a positioning block, and the positioning block is inserted into the positioning groove.

[0012] As an optional technical solution for the contact assembly of the above-mentioned circuit breaker, a first baffle plate is provided in the base, the first static contact and the second static contact are arranged on both sides of the first baffle plate, the two first moving contacts are arranged on both sides of the first baffle plate, at least one plug-in slot is respectively provided on the base on both sides of the first baffle plate, the plug-in slots are respectively recessed on both sides of the first baffle plate, and the positioning block is formed between the two plug-in slots.

[0013] As an optional technical solution for the contact assembly of the above-mentioned circuit breaker, the second terminal is arranged opposite to the first terminal, the second terminal is connected to the second static contact through a transfer row, and a second baffle plate is provided in the base between the transfer row and the short-circuit row.

[0014] As an optional technical solution of the contact assembly of the above-mentioned circuit breaker, the contact assembly of the circuit breaker also includes a second contact group, the second contact group is arranged in the base, and a third baffle is provided in the base between the second contact group and the first contact group, the second contact group includes a second moving contact and a third static contact, the third static contact is connected to a third terminal, and the second moving contact is connected to a fourth terminal.

[0015] As an optional technical solution of the contact assembly of the circuit breaker, the third stationary contact and the first stationary contact both include:

[0016] A first stationary contact body, which is in an S-shaped structure, one end of which is connected to the third wiring terminal or the first wiring terminal;

[0017] A connecting plate, one end of which is connected to the other end of the first static contact body, the connecting plate and the first static contact body form a U-shaped structure, and the other end of the connecting plate is provided with a first static contact point;

[0018] A first arc-striking plate, one end of which is connected to the first static contact, and the other end of which is insulated and connected to the first static contact body;

[0019] The first magnetizing component is in a U-shaped structure. The first magnetizing component is arranged below the first static contact, and two ends of the first magnetizing component are flush with the first static contact.

[0020] As an optional technical solution of the contact assembly of the circuit breaker, the second stationary contact includes:

[0021] A second static contact body is in an S-shaped structure, one end of the second static contact body is connected to the second wiring terminal, and the other end of the second static contact body is provided with a second static contact point;

[0022] a second arc-starting plate, one end of which is connected to the second static contact;

[0023] The second magnetizing component is in a U-shaped structure. The second magnetizing component is arranged below the second static contact, and two ends of the second magnetizing component are flush with the second static contact.

[0024] As an optional technical solution for the contact assembly of the above-mentioned circuit breaker, the second wiring terminal is arranged opposite to the first wiring terminal, a portion of the second static contact body is placed below the first moving contact, the base is provided with a mounting groove penetrating the base, the portion of the second static contact body placed below the first moving contact is placed in the mounting groove, and the bottom cover of the mounting groove is provided with an insulating cover.

[0025] On the other hand, a circuit breaker is provided, comprising the contact assembly of any one of the circuit breaker described above.

[0026] Beneficial effects of the utility model:

[0027] The contact assembly provided by the utility model comprises a first contact group, wherein two first moving contacts of the first contact group are connected in series through a short-circuit bar, thereby improving the high-voltage breaking capacity of the circuit breaker; the first contact group and the short-circuit bar are both arranged in the base, thereby ensuring the electrical clearance and creepage distance of the circuit breaker in use, and the circuit breaker is not prone to breakdown, thereby improving the performance of the circuit breaker in cutting off the current, and achieving the purpose of effectively protecting the circuit; and the short-circuit bar is plugged into the base, thereby realizing the installation and fixation of the short-circuit bar, reducing the use of parts and components, and a connecting part is arranged on the short-circuit bar, which is connected to the first moving contact through a flexible connecting line, thereby realizing the series connection of the two first moving contacts without affecting the action of the first moving contact, reducing the use of the short-circuit bar, and reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a top view of a structure of a contact assembly provided by an embodiment of the utility model;

[0029] Figure 2 It is a top view of another structure of a contact assembly provided by an embodiment of the utility model;

[0030] Figure 3 This is a schematic diagram of the axial structure of the short-circuit bar provided by the embodiment of the utility model installed in the base;

[0031] Figure 4 It is a schematic diagram of the structure of the short-circuit bar provided in an embodiment of the utility model;

[0032] Figure 5 It is a top view of the short-circuit bar provided by the embodiment of the utility model installed in the base;

[0033] Figure 6 It is a partial structural schematic diagram of a base provided by an embodiment of the utility model;

[0034] Figure 7 This is a schematic diagram of the structure of a contact assembly provided by an embodiment of the utility model in an open state;

[0035] Figure 8 This is a schematic diagram of the structure of a contact assembly provided by an embodiment of the utility model in a closed state;

[0036] Fig. 9 It is a schematic diagram of another structure of the contact assembly provided by an embodiment of the utility model in an open state;

[0037] Fig.10 It is a schematic structural diagram of another structure of the contact assembly provided by an embodiment of the utility model in a closed state;

[0038] Fig.11 It is a schematic diagram of the structure of the first stationary contact or the third stationary contact provided in an embodiment of the utility model;

[0039] Fig.12 It is a structural schematic diagram of the second static contact provided by an embodiment of the utility model;

[0040] Fig.13 It is a schematic diagram of the installation structure of the second static contact provided in an embodiment of the utility model.

[0041] In the figure:

[0042] 1. Base; 2. First contact group; 3. First terminal; 4. Second terminal; 5. Shorting bar; 6. Flexible connecting wire; 7. Transfer bar; 8. Second contact group; 9. Third terminal; 10. Fourth terminal;

[0043] 11. Plug-in slot; 12. Positioning block; 13. First baffle plate; 14. Second baffle plate; 15. Third baffle plate; 16. Mounting slot; 17. Insulation cover;

[0044] 21. first moving contact; 22. first stationary contact; 221. first stationary contact body; 222. coupling plate; 223. first stationary contact point; 224. first arc-starting plate; 225. first magnetizing component; 226. insulating paperboard; 23. second stationary contact; 231. second stationary contact body; 232. second stationary contact point; 233. second arc-starting plate; 234. second magnetizing component;

[0045] 51. connecting portion; 52. positioning groove;

[0046] 81, second moving contact; 82, third stationary contact;

[0047] 100. operating mechanism; 200. release; 201. yoke; 202. armature; 203. bimetallic part. DETAILED DESCRIPTION

[0048] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0049] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0051] like Figures 1 to 4 As shown, this embodiment provides a contact assembly of a circuit breaker, which includes a base 1, a first contact group 2 and a short-circuit bar 5. The first contact group 2 is arranged in the base 1, and the first contact group 2 includes a first static contact 22, a second static contact 23 and two first moving contacts 21, the first static contact 22 is connected to the first terminal 3, and the second static contact 23 is connected to the second terminal 4. The short-circuit bar 5 is plugged into the base 1, and two connecting parts 51 are arranged on the short-circuit bar 5 at intervals, each connecting part 51 is respectively connected to a flexible connecting wire 6, and the two flexible connecting wires 6 are respectively connected to the corresponding first moving contacts 21.

[0052] The contact assembly provided in this embodiment includes a first contact group 2, and the two first moving contacts 21 of the first contact group 2 are connected in series through a short-circuit bar 5, thereby improving the high-voltage breaking capacity of the circuit breaker; the first contact group 2 and the short-circuit bar 5 are both arranged in the base 1, thereby ensuring the electrical clearance and creepage distance of the circuit breaker in use, and the circuit breaker is not prone to breakdown, thereby improving the performance of the circuit breaker in cutting off the current, and achieving the purpose of effectively protecting the circuit; and the short-circuit bar 5 is plugged into the base 1, thereby realizing the installation and fixation of the short-circuit bar 5, reducing the use of parts and components, and a connecting portion 51 is provided on the short-circuit bar 5, and the connecting portion 51 is connected to the first moving contact 21 through a flexible connecting line 6, so that while realizing the series connection of the two first moving contacts 21, the action of the first moving contact 21 is not affected, and the use of the short-circuit bar 5 is reduced, thereby reducing the cost.

[0053] In actual use, current flows from the second terminal 4 to the first terminal 3 via the second static contact 23, the two first moving contacts 21 and the first static contact 22. The two first moving contacts 21 are fixed in the base 1 by the rotating shafts, and the first moving contacts 21 can rotate relative to the base 1.

[0054] like Figures 3 to 6As shown, in some embodiments, the connecting portion 51 is protruded from an edge of the short-circuit bar 5, and at least two plug-in slots 11 are provided on the base 1. The edge of the short-circuit bar 5 provided with the connecting portion 51 is plugged into the plug-in slot 11, and the connecting portion 51 is placed in the base 1, which is convenient for installing and fixing the short-circuit bar 5, and ensures that the short-circuit bar 5 is completely placed in the base 1 without being exposed, which is convenient for connecting the soft connecting wire 6, so that the soft connecting wire 6 is placed below the first moving contact 21, and will not affect the action of the first moving contact 21.

[0055] The short-circuit bar 5 is provided with a convex connection portion 51 and a concave positioning groove 52 on its edge. The base 1 is provided with a positioning block 12, which is inserted into the positioning groove 52 to position the installation position of the short-circuit bar 5, facilitate the quick installation of the short-circuit bar 5, and also fix the short-circuit bar 5.

[0056] Further optionally, the two connection parts 51 are symmetrically arranged relative to the positioning groove 52, and the positioning groove 52 is arranged in the middle position of the short-circuit bar 5. The short-circuit bar 5 can be installed on the base 1 when it is rotated 180° around the vertical axis.

[0057] A first baffle plate 13 is provided in the base 1, a first static contact 22 and a second static contact 23 are provided on both sides of the first baffle plate 13, and two first moving contacts 21 are provided on both sides of the first baffle plate 13. The first baffle plate 13 plays a role in isolating adjacent phases of the circuit breaker, and increases the electrical clearance and creepage distance of the circuit breaker during the use of the circuit breaker. For a high-voltage DC circuit breaker, it is not easy to have phase-to-phase breakdown, and the performance of the circuit breaker in cutting off the current is improved, achieving the purpose of protecting the circuit. At least one plug-in slot 11 is provided on the base 1 on both sides of the first baffle plate 13 to stably fix the short-circuit bar 5. Insertion grooves 11 are respectively recessed on both sides of the first baffle plate 13, and a positioning block 12 is formed between the two insertion grooves 11. The edge of the short-circuit bar 5 is inserted into the insertion groove 11, and the positioning block 12 is inserted into the positioning groove 52. On the premise that the first baffle plate 13 effectively isolates adjacent phases, the short-circuit bar 5 spans the first baffle plate 13 to connect the two first moving contacts 21. At the same time, the short-circuit bar 5 is plugged into the first baffle plate 13 to fix the short-circuit bar 5.

[0058] Plug-in blocks are provided in the base 1 on both sides of the first baffle plate 13, and plug-in slots 11 are provided on the plug-in blocks. The two plug-in blocks are symmetrically arranged relative to the first baffle plate 13 so that the short-circuit bar 5 can be installed and fixed on the base 1 even when it is rotated 180° around the vertical axis.

[0059] Reference Figure 3 , Figure 7 and Fig. 9As shown, in some embodiments, since the first wiring terminal 3 is connected to the first static contact 22, the second wiring terminal 4 is connected to the second static contact 23, and the first static contact 22 and the second static contact 23 are arranged at intervals, in order to reduce the size of the circuit breaker in the width direction, the second wiring terminal 4 is arranged opposite to the first wiring terminal 3, and the second wiring terminal 4 is connected to the second static contact 23 through the adapter row 7. A second baffle plate 14 is provided in the base 1 between the adapter row 7 and the short-circuit row 5, and the second baffle plate 14 isolates the adapter row 7 and the short-circuit row 5 to prevent the adapter row 7 and the short-circuit row 5 from short-circuiting under high voltage, thereby ensuring that the circuit breaker can work normally.

[0060] The transfer row 7 is connected to the second static contact 23 by bolts. The transfer row 7 extends along the arrangement direction of the first static contact 22 and the second static contact 23. One end of the transfer row 7 is vertically connected to the first connection plate, and the other end of the transfer row 7 is vertically connected to the second connection plate. The second connection plate and the first connection plate are spaced apart in the width direction of the transfer row 7. The first connection plate is connected to the second terminal 4, and the second connection plate is connected to the second static contact 23.

[0061] Reference Figures 1 to 3 As shown, the contact assembly of the circuit breaker also includes a second contact group 8, which is arranged in the base 1, and a third baffle plate 15 is arranged in the base 1 between the second contact group 8 and the first contact group 2, and the second contact group 8 includes a second moving contact 81 and a third static contact 82, the third static contact 82 is connected to the third wiring terminal 9, and the second moving contact 81 is connected to the fourth wiring terminal 10. An external load is connected between the fourth wiring terminal 10 and the second wiring terminal 4. After the circuit breaker is closed, the current flows from the third wiring terminal 9 to the fourth wiring terminal 10, and then flows to the second wiring terminal 4 and the first wiring terminal 3 after passing through the load, forming a loop. And when the current flows from the second wiring terminal 4 to the first wiring terminal 3, the current flow direction in the second static contact 23 is opposite to the current flow direction in the first moving contact 21 corresponding to the second static contact 23, which is conducive to the first moving contact 21 to be repelled.

[0062] The first stationary contact 22 , the second stationary contact 23 and the third stationary contact 82 are arranged side by side. In some embodiments, the first stationary contact 22 is placed between the third stationary contact 82 and the second stationary contact 23 , the first terminal 3 is arranged adjacent to the third terminal 9 , and the second terminal 4 is arranged adjacent to the fourth terminal 10 . Figure 7 is a schematic structural diagram of a structure of a contact assembly provided in this embodiment in an open state; Figure 8 It is a schematic structural diagram of a structure of a contact assembly provided in this embodiment in a closed state.

[0063] In some other embodiments, the second stationary contact 23 is placed between the first stationary contact 22 and the third stationary contact 82, the first terminal 3 and the third terminal 9 are spaced apart, and the second terminal 4 and the fourth terminal 10 are spaced apart, thereby increasing the creepage distance and electrical clearance between the phases of the incoming and outgoing lines. Fig. 9 is a schematic structural diagram of another structure of the contact assembly provided in this embodiment in an open state; Fig.10 It is a schematic diagram of the structure of another structure of the contact assembly provided in this embodiment in the closed state.

[0064] In some embodiments, Fig.11 As shown, the third stationary contact 82 and the first stationary contact 22 both include a first stationary contact body 221 , a connecting plate 222 , a first arc-starting plate 224 and a first magnetizing component 225 .

[0065] The first static contact body 221 is in an S-shaped structure, and one end of the first static contact body 221 is connected to the third terminal 9 or the first terminal 3. One end of the connecting plate 222 is connected to the other end of the first static contact body 221, and the connecting plate 222 and the first static contact body 221 form a U-shaped structure, and the other end of the connecting plate 222 is provided with a first static contact 223. Optionally, the connecting plate 222 is formed by bending the other end of the first static contact body 221, which reduces the amount of material used, and the connecting plate 222 makes the direction of current flow opposite to the direction of current flow on the first static contact body 221, thereby increasing the electric repulsion force on the first moving contact 21, accelerating the transfer of the arc at the first static contact 223, and reducing the burning of the arc on the first static contact 223.

[0066] One end of the first arc-starting plate 224 is connected to the first static contact 223. Optionally, the first arc-starting plate 224 is connected to the first static contact 223 by welding. The other end of the first arc-starting plate 224 is insulated and connected to the first static contact body 221 to prevent the first arc-starting plate 224 and the first static contact body 221 from breaking down, so that the connecting plate 222 loses the function of magnetizing. The first arc-starting plate 224 is a ferromagnetic material or a pure copper material. Optionally, an insulating paperboard 226 is provided on the first static contact body 221, and the first arc-starting plate 224 is connected to the insulating paperboard 226.

[0067] The first magnetizing component 225 is in a U-shaped structure. The first magnetizing component 225 is arranged below the first static contact 223. The first static contact 223 is placed in the U-shaped space of the first magnetizing component 225, and the two ends of the first magnetizing component 225 are flush with the first static contact 223. The first magnetizing component 225 is placed in the U-shaped space surrounded by the connecting plate 222 and the first static contact body 221. The first magnetizing component 225 can enhance the magnetic field at the first static contact 223 during the disconnection of the circuit breaker, thereby increasing the electric repulsion force on the first moving contact 21, accelerating the transfer of the arc at the first static contact 223, and reducing the burning of the first static contact 223 by the arc. Optionally, the first magnetizing component 225 includes a plurality of U-shaped magnetizing plates, and the plurality of magnetizing plates are connected by riveting.

[0068] In some embodiments, Fig.12 As shown, the second static contact 23 includes a second static contact body 231 , a second arc-starting plate 233 and a second magnetizing component 234 .

[0069] The second static contact body 231 is in an S-shaped structure. One end of the second static contact body 231 is connected to the second terminal 4, and the other end of the second static contact body 231 is provided with a second static contact 232. One end of the second arc-starting plate 233 is connected to the second static contact 232. The current flow direction in the second static contact body 231 is opposite to the current flow direction in the first moving contact 21 corresponding to the second static contact body 231, which is conducive to the repulsion of the first moving contact 21. The second magnetizing component 234 is in a U-shaped structure. The second magnetizing component 234 is arranged below the second static contact 232. The second static contact 232 is placed in the U-shaped space of the second magnetizing component 234, and the two ends of the second magnetizing component 234 are flush with the second static contact 232. The second magnetizing component 234 can enhance the magnetic field at the second static contact 232 during the circuit breaker disconnection process, thereby increasing the electromotive repulsion force on the first moving contact 21, accelerating the transfer of the arc at the second static contact 232, and reducing the arc burning of the second static contact 232. Optionally, the second magnetizing component 234 includes a plurality of U-shaped magnetizing plates, and the plurality of magnetizing plates are connected by riveting.

[0070] Alternatively, if Fig.13 As shown, the second terminal 4 is arranged opposite to the first terminal 3, and part of the second static contact body 231 is placed below the first moving contact 21. The base 1 is provided with a mounting groove 16 that penetrates the base 1, and the part of the second static contact body 231 placed below the first moving contact 21 is placed in the mounting groove 16 to position and install the second static contact 23, and the bottom cover of the mounting groove 16 is provided with an insulating cover 17 to insulate and isolate the second static contact 23 from other components.

[0071] This embodiment also provides a circuit breaker, which is a DC circuit breaker. The circuit breaker includes the contact assembly of the circuit breaker mentioned above, and is specifically a DC circuit breaker with three stages in appearance and two stages in series inside, suitable for breaking under high voltage.

[0072] Reference Figure 4 and Fig.10 As shown, the circuit breaker also includes a release 200 and an operating mechanism 100. The release 200 can be a thermal magnetic release. A release 200 is provided corresponding to the first contact group 2. The release 200 is connected to the short-circuit row 5. The two stages share a release 200, which not only protects the circuit, but also reduces the number of parts and components, saving costs. The release 200 enables the operating mechanism 100 to perform a tripping action, thereby disconnecting the circuit breaker. A release 200 is provided corresponding to the second contact group 8.

[0073] The release 200 includes a magnetic trip unit and a thermal trip unit. The yoke 201 of the magnetic trip unit is connected to the short-circuit bar 5, and the bimetallic piece 203 of the thermal trip unit is connected to the short-circuit bar 5. The current on the short-circuit bar 5 flows through the yoke 201. When the short-circuit current is relatively large, the magnetized yoke 201 can generate a sufficiently large electromagnetic attraction to attract the armature 202. The armature 202 rotates until one end of the armature 202 contacts the yoke 201, and the other end of the armature 202 hits the traction rod of the operating mechanism 100, causing the operating mechanism 100 to perform a tripping action. In the case of a current higher than the rated current, the short-circuit bar 5 generates a higher temperature at the position where the bimetallic piece 203 is connected, causing it to bend and deform greatly. The other end of the bimetallic piece 203 pushes the traction rod of the operating mechanism 100, causing the operating mechanism 100 to perform a tripping action.

[0074] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A contact assembly of a circuit breaker, characterized in that: include: Base (1); A first contact group (2) is arranged in the base (1), the first contact group (2) comprising a first stationary contact (22), a second stationary contact (23) and two first moving contacts (21), the first stationary contact (22) being connected to a first wiring terminal (3), and the second stationary contact (23) being connected to a second wiring terminal (4); A short-circuit bar (5), the short-circuit bar (5) being plugged into the base (1), the short-circuit bar (5) being provided with two connection parts (51) at intervals, each of the connection parts (51) being connected to a flexible connection line (6), and the two flexible connection lines (6) being connected to corresponding first moving contacts (21) respectively.

2. The contact assembly of the circuit breaker according to claim 1, characterized in that: The connecting portion (51) is protruding from an edge of the short-circuit bar (5); the base (1) is provided with at least two plug-in slots (11); the edge of the short-circuit bar (5) provided with the connecting portion (51) is plugged into the plug-in slot (11); and the connecting portion (51) is placed in the base (1).

3. The contact assembly of the circuit breaker according to claim 2, characterized in that: The edge of the short-circuit bar (5) on which the connecting portion (51) is convexly provided is concavely provided with a positioning groove (52), and a positioning block (12) is provided on the base (1), and the positioning block (12) is inserted into the positioning groove (52).

4. The contact assembly of the circuit breaker according to claim 3, characterized in that: A first baffle plate (13) is provided inside the base (1); the first static contact (22) and the second static contact (23) are arranged on both sides of the first baffle plate (13); the two first moving contacts (21) are arranged on both sides of the first baffle plate (13); at least one plug-in slot (11) is respectively provided on the base (1) on both sides of the first baffle plate (13); the plug-in slots (11) are respectively recessed on both sides of the first baffle plate (13); and the positioning block (12) is formed between the two plug-in slots (11).

5. The contact assembly of the circuit breaker according to claim 1, characterized in that: The second wiring terminal (4) is arranged opposite to the first wiring terminal (3), the second wiring terminal (4) is connected to the second static contact (23) via a transfer row (7), and a second baffle plate (14) is provided in the base (1) between the transfer row (7) and the short-circuit row (5).

6. The contact assembly of the circuit breaker according to claim 1, characterized in that: The contact assembly of the circuit breaker further comprises a second contact group (8), the second contact group (8) being arranged in the base (1), and a third baffle plate (15) being arranged in the base (1) between the second contact group (8) and the first contact group (2), the second contact group (8) comprising a second moving contact (81) and a third stationary contact (82), the third stationary contact (82) being connected to a third wiring terminal (9), and the second moving contact (81) being connected to a fourth wiring terminal (10).

7. The contact assembly of the circuit breaker according to claim 6, characterized in that: The third stationary contact (82) and the first stationary contact (22) both include: A first stationary contact body (221) having an S-shaped structure, one end of the first stationary contact body (221) being connected to the third wiring terminal (9) or the first wiring terminal (3); a connecting plate (222), one end of the connecting plate (222) being connected to the other end of the first static contact body (221), the connecting plate (222) and the first static contact body (221) forming a U-shaped structure, and the other end of the connecting plate (222) being provided with a first static contact point (223); A first arc-striking plate (224), one end of the first arc-striking plate (224) being connected to the first static contact (223), and the other end of the first arc-striking plate (224) being insulated and connected to the first static contact body (221); The first magnetizing component (225) has a U-shaped structure. The first magnetizing component (225) is arranged below the first static contact (223), and two ends of the first magnetizing component (225) are flush with the first static contact (223).

8. The contact assembly of the circuit breaker according to claim 1, characterized in that: The second stationary contact (23) comprises: A second stationary contact body (231) having an S-shaped structure, one end of the second stationary contact body (231) being connected to the second wiring terminal (4), and the other end of the second stationary contact body (231) being provided with a second stationary contact point (232); A second arc-starting plate (233), one end of the second arc-starting plate (233) being connected to the second static contact (232); The second magnetizing component (234) has a U-shaped structure. The second magnetizing component (234) is arranged below the second static contact (232), and two ends of the second magnetizing component (234) are flush with the second static contact (232).

9. The contact assembly of the circuit breaker according to claim 8, characterized in that: The second wiring terminal (4) is arranged opposite to the first wiring terminal (3), a portion of the second stationary contact body (231) is placed below the first moving contact (21), the base (1) is provided with a mounting groove (16) penetrating the base (1), the portion of the second stationary contact body (231) placed below the first moving contact (21) is placed in the mounting groove (16), and the bottom cover of the mounting groove (16) is provided with an insulating cover (17).

10. A circuit breaker, characterized in that A contact assembly for a circuit breaker comprising any one of claims 1-9.

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