A bimetallic strip and circuit breaker

Abstract

This utility model belongs to the field of low-voltage electrical appliance technology, and discloses a bimetallic strip and a circuit breaker. The circuit breaker includes a base and a tripping mechanism disposed on the base, and the base has a mounting part; the bimetallic strip is used for overload protection of the circuit breaker and includes a fixed part and a movable part, the fixed part being fixed to the mounting part; the first end of the movable part is connected to the fixed part, and the second end of the movable part is configured to be linked with the tripping mechanism. The movable part deforms relative to the fixed part with temperature changes, thereby driving the tripping mechanism to actuate and realize the disconnection of the circuit breaker circuit. Since the position of the mounting part on the base is fixed, after the fixed part is fixed to the mounting part, the fixed part can always remain fixedly connected to the mounting part, which can ensure that the initial position of the bimetallic strip in the circuit breaker product is consistent, realizing calibration-free operation. The position of the end of the movable part connected to the fixed part always remains fixed, and the position does not shift relative to the fixed part after long-term use, effectively improving the reliability of the circuit breaker's overload protection function.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to a bimetallic strip and circuit breaker. Background Technology

[0002] A bimetallic strip is a composite metal strip made of two or more metals or other materials with suitable properties. Due to the different coefficients of thermal expansion of the constituent layers, when the temperature changes, the deformation of the active layer is greater than that of the passive layer. As a result, the bimetallic strip bends towards the passive layer, causing deformation. Bimetallic strips are commonly used in the thermal overload protection circuit of circuit breakers. When an overload occurs in the circuit, the bimetallic strip bends and presses against the trip mechanism, causing the trip mechanism to move and thus disconnect the circuit.

[0003] like Figure 1 As shown, in related technologies, the bimetallic strip structure 1′ is usually designed as a straight strip. The first end of the bimetallic strip structure 1′ is provided with an arc-starting plate structure 2′ and a terminal block structure 3′ on both sides. One side of the bimetallic strip structure 1′ is electrically connected to the arc-starting plate structure 2′, and the other end is electrically connected to the terminal block structure 3′. The connection between the bimetallic strip structure 1′ and the arc-starting plate structure 2′ is usually spot welded. The second end of the bimetallic strip structure 1′ is linked with the jumper structure 4′, which drives the jumper structure 4′ to move when overloaded.

[0004] The bimetallic strip structure 1′ is supported by the arc-starting strip structure 2′. Due to the size difference of the arc-starting strip structure 2′, and after the spot welding process or external pressure, the initial position of the bimetallic strip structure 1′ may be inconsistent. To solve this problem, an adjusting screw 5′ is set at the first end of the corresponding bimetallic strip structure 1′. During production, the adjusting screw 5′ needs to be manually checked and adjusted one by one to keep the initial position of the bimetallic strip structure 1′ consistent. On the one hand, the checking workload is large, and on the other hand, during the use of the circuit breaker, the bimetallic strip structure 1′ may shift relative to the initial position, affecting the performance of the circuit breaker product. Utility Model Content

[0005] The purpose of this utility model is to provide a bimetallic strip and a circuit breaker that eliminates the need for checking the initial position of the bimetallic strip, ensures that the initial position of the bimetallic strip of the circuit breaker is consistent, and that the initial position does not shift relative to the initial position after long-term use, thereby improving the reliability of the circuit breaker.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] On the one hand, a bimetallic strip is provided for providing overload protection for a circuit breaker, the circuit breaker including a base and a tripping mechanism disposed on the base, the base being provided with a mounting portion;

[0008] The bimetallic strip includes:

[0009] A fixing portion, which is configured to be fixed to the mounting portion;

[0010] The movable part has a first end connected to the fixed part and a second end configured to be linked with the tripping mechanism. The movable part deforms relative to the fixed part as the temperature changes, thereby driving the tripping mechanism to move.

[0011] As an optional solution for the bimetallic strip provided by this utility model, the fixing part includes a fixing frame, the fixing frame surrounds a notch, the first end of the movable part is connected to the inner wall of the notch, and the second end of the movable part is located inside the notch or extends out of the notch.

[0012] As an optional embodiment of the bimetallic strip provided by this utility model, the fixed part includes a fixed piece, the movable part extends in the same direction as the fixed piece, and the movable part is located on one side of the fixed piece.

[0013] As an optional embodiment of the bimetallic strip provided by this utility model, there is a gap between the outer wall of the movable part facing the fixed part and the fixed part.

[0014] On the other hand, a circuit breaker is provided, including a base, a tripping mechanism, a terminal block, an arc-striking plate, and a bimetallic strip as described above;

[0015] The base is provided with a mounting part, which is used to fix the fixing part of the bimetallic strip. The fixing part is electrically connected to both the terminal block and the arc-starting plate.

[0016] The movable part of the bimetallic strip is linked to the tripping mechanism to drive the tripping mechanism to move.

[0017] As an optional solution for the circuit breaker provided by this utility model, the mounting part includes a slot structure, the fixing part is engaged with the slot structure, and the slot structure limits the fixing part in three mutually perpendicular directions.

[0018] As an optional solution for the circuit breaker provided by this utility model, the slot structure includes a first slot, a second slot, and a third slot distributed along a first direction; the fixing part is inserted into the first slot, the second slot, and the third slot along a second direction.

[0019] Wherein, the first direction is the length direction of the bimetallic strip, and the second direction is the width direction of the bimetallic strip.

[0020] As an optional solution for the circuit breaker provided by this utility model, the base includes a top plate and a bottom plate spaced apart along the first direction, a side plate connecting the top plate and the bottom plate, a first slot recessed in the top plate, a third slot recessed in the bottom plate, and a first limiting block and a second limiting block protruding from the side plate and distributed along a third direction, the first limiting block, the second limiting block, and the side plate surrounding the third slot; wherein, the third direction is the thickness direction of the bimetallic strip;

[0021] Both the first card slot and the third card slot have a first sidewall, a second sidewall, and a first bottom wall. The first sidewall limits the fixing portion in the first direction, the second sidewall limits the fixing portion in the third direction, and the first bottom wall limits the fixing portion in the second direction.

[0022] As an optional solution for the circuit breaker provided by this utility model, the base includes a top plate and a bottom plate spaced apart, a side plate is connected between the top plate and the bottom plate, a limiting frame is protruding from the side plate, and the slot structure includes a fourth slot formed by the limiting frame and the side plate.

[0023] As an optional solution for the circuit breaker provided by this utility model, the fixing part and the inner wall of the slot structure are provided with an adhesive structure.

[0024] The beneficial effects of this utility model are:

[0025] This utility model provides a bimetallic strip and a circuit breaker using the bimetallic strip. The bimetallic strip is designed with a fixed part and a movable part connected together. During installation, the fixed part is fixedly connected to the mounting part of the circuit breaker base, realizing the installation of the bimetallic strip inside the circuit breaker. The movable part is linked with the tripping mechanism of the circuit breaker. It is used to deform with temperature changes during overload, thereby driving the tripping mechanism to disconnect the circuit and realize the overload protection function. That is, the fixed part of the bimetallic strip is fixed and cannot deform due to the restriction of the mounting part, while the movable part can bend normally after being heated by electricity, realizing the tripping. Since the position of the mounting part on the base is fixed, after the fixed part is fixed to the mounting part, the fixed part can always remain fixedly connected to the mounting part, which can ensure that the initial position of the bimetallic strip in the circuit breaker is consistent, eliminating the need to check the position of the bimetallic strip of the circuit breaker one by one. Moreover, the position of the end of the movable part connected to the fixed part always remains fixed, and the position will not shift relative to the mounting part after long-term use, effectively improving the reliability of the circuit breaker's overload protection function. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the installation of a bimetallic strip structure inside a circuit breaker in the prior art;

[0028] Figure 2 This is a first view of the bimetallic strip on the circuit breaker base provided in Embodiment 1 of this utility model;

[0029] Figure 3 This is a schematic diagram of the structure of the bimetallic sheet provided in Embodiment 1 of this utility model;

[0030] Figure 4 This is a second view of the bimetallic strip on the circuit breaker base provided in Embodiment 1 of this utility model;

[0031] Figure 5 This is a third view of the bimetallic strip on the circuit breaker base provided in Embodiment 1 of this utility model;

[0032] Figure 6 yes Figure 5 A magnified view of a section at point A in the middle;

[0033] Figure 7 yes Figure 5 A magnified view of a section at point B in the middle;

[0034] Figure 8 This is a schematic diagram of the structure of the bimetallic sheet provided in Embodiment 2 of this utility model;

[0035] Figure 9 This is a first view of the bimetallic strip on the circuit breaker base provided in Embodiment 2 of this utility model;

[0036] Figure 10 yes Figure 9 A partial view.

[0037] Figure 1 middle:

[0038] 1′ Bimetallic strip structure; 2′ Arc-inducing strip structure; 3′ Terminal block structure; 4′ Jumper clip structure; 5′ Adjusting screw.

[0039] Figures 2 to 10 middle:

[0040] 1. Bimetallic strip; 2. Base; 3. Tripping mechanism; 4. Arc-inducing plate;

[0041] 11. Fixed part; 12. Movable part; 13. Gap;

[0042] 111. Fixing frame; 112. Notch; 113. Fixing piece;

[0043] 20. Mounting section; 21. Slot structure; 22. Top plate; 23. Bottom plate; 24. Side plate; 25. First limiting block; 26. Second limiting block; 27. Limiting frame;

[0044] 211. First card slot; 212. Second card slot; 213. Third card slot; 214. Fourth card slot;

[0045] 2111, First sidewall; 2112, Second sidewall;

[0046] 2141. Third sidewall; 2142. Fourth sidewall;

[0047] 31. Trigger lever. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0049] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0052] In this embodiment, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0053] In the embodiments of this utility model, the same reference numerals denote the same parts, and for the sake of brevity, detailed descriptions of the same parts are omitted in different embodiments.

[0054] Example 1

[0055] like Figure 2 As shown, this embodiment provides a bimetallic strip 1 for providing overload protection for a circuit breaker. The circuit breaker includes a base 2 and a tripping mechanism 3 disposed on the base 2. The base 2 is provided with a mounting portion 20. The bimetallic strip 1 includes a fixed portion 11 and a movable portion 12. The fixed portion 11 is configured to be fixed to the mounting portion 20. The first end of the movable portion 12 is connected to the fixed portion 11, and the second end of the movable portion 12 is configured to be linked with the tripping mechanism 3. The movable portion 12 deforms relative to the fixed portion 11 as the temperature changes, thereby driving the tripping mechanism 3 to operate.

[0056] In this embodiment, the bimetallic strip 1 is designed with a fixed part 11 and a movable part 12 connected together. During installation, the fixed part 11 is fixedly connected to the mounting part 20 of the circuit breaker base 2, thus enabling the bimetallic strip 1 to be installed inside the circuit breaker. The movable part 12 is linked with the tripping mechanism 3 of the circuit breaker, and is used to deform with temperature changes during overload, thereby driving the tripping mechanism 3 to operate and disconnect the circuit, thus providing overload protection. That is, the fixed part 11 of the bimetallic strip 1 is fixed and cannot deform due to the restriction of the mounting part 20, while the movable part 12 can bend normally after being heated by electricity, thus achieving tripping. Since the position of the mounting part 20 on the base 2 is fixed, after fixing the fixed part 11 to the mounting part 20, the fixed part 11 can always remain fixedly connected to the mounting part 20, ensuring that the initial position of the bimetallic strip 1 in the circuit breaker product is consistent, eliminating the need to check the position of the bimetallic strip of the circuit breaker one by one. Moreover, the position of the end where the movable part 12 is connected to the fixed part 11 remains fixed, and the position does not shift relative to the fixed part after long-term use, which effectively improves the reliability of the circuit breaker's overload protection function.

[0057] like Figure 3 As shown, optionally, the fixed part 11 includes a fixed frame 111, which surrounds a notch 112. The first end of the movable part 12 is connected to the inner wall of the notch 112, and the second end of the movable part 12 is located inside or extends out of the notch 112. The fixed frame 111 is fixed by the mounting part 20 on the base 2 to ensure that it will not shift or deform. When the internal circuit of the circuit breaker is normal, the movable part 12 of the bimetallic strip 1 is located inside the notch 112, such as... Figure 4 The state shown. When the internal circuit of the circuit breaker is overloaded, the movable part 12 of the bimetallic strip 1 deforms and bends relative to the fixed part 11 due to the high temperature, as shown. Figure 2 and Figure 3 As shown, the second end of the movable part 12 extends out of the notch 112 of the fixed frame 111 due to bending deformation, and pushes against the tripping rod 31 of the tripping mechanism 3, thereby driving the tripping mechanism 3 to operate and cut off the circuit.

[0058] When manufacturing the bimetallic strip 1, a notch 112 can be formed in the middle of the rectangular strip of bimetal through cutting and other processes. While the notch 112 is being formed, the movable part 12 can be formed. The process is simple and can ensure the overall strength of the bimetallic strip 1.

[0059] like Figure 3 As shown, there is a gap 13 between the movable part 12 and the fixed part 11 on the outer wall facing the fixed part 11. The gap 13 prevents the fixed part 11 and the movable part 12 from contacting each other, especially from contact and friction caused by thermal expansion and contraction. It also prevents the friction between the two from preventing the movable part 12 from bending and deforming relative to the fixed part 11, thus ensuring the reliability of the overload protection function.

[0060] like Figure 2 , Figure 4 as well as Figure 5 As shown, this embodiment also provides a circuit breaker, including a base 2, a tripping mechanism 3, a terminal block (not shown in the figure), an arc-striking plate 4, and a bimetallic strip 1 as described above. The base 2 is provided with a mounting portion 20, which is used to fix the fixing portion 11 of the bimetallic strip 1. The fixing portion 11 is electrically connected to both the terminal block and the arc-striking plate 4. The movable portion 12 of the bimetallic strip 1 is linked to the tripping mechanism 3 to drive the tripping mechanism 3 to operate.

[0061] The fixed part 11 can be directly connected to the arc-starting plate 4 by spot welding or by means of a wire. The fixed part 11 can also be directly connected to the terminal block by spot welding or by means of a wire. There are no restrictions on this, as long as the fixed part 11 can be electrically connected to the arc-starting plate 4 and the terminal block.

[0062] The movable part 12 of the bimetallic strip 1 is specifically linked to the tripping lever 31 of the tripping mechanism 3, and can drive the tripping mechanism 3 to move by pressing the tripping lever 31.

[0063] like Figure 2 , Figure 4 as well as Figure 5 As shown, the mounting part 20 includes a slot structure 21, and the fixing part 11 is engaged with the slot structure 21. The slot structure 21 limits the fixing part 11 in three mutually perpendicular directions. This not only makes installation more convenient, eliminating the need for welding, screwing, or other means, thus improving assembly efficiency, but also ensures the limiting stability of the fixing part 11, effectively preventing its displacement and deformation. While achieving position verification-free bimetallic strip 1, it ensures that the fixing part 11 of the bimetallic strip 1 always remains in the set position, improving the reliability of the circuit breaker overload protection.

[0064] Specifically, the three mutually perpendicular directions are the first direction, the second direction, and the third direction, where the first direction is the length direction of the bimetallic strip 1, the second direction is the width direction of the bimetallic strip 1, and the third direction is the thickness direction of the bimetallic strip 1. The fixing part 11 of the bimetallic strip 1 is fixed in these three directions to ensure that it is firm and reliable.

[0065] like Figure 4 and Figure 5As shown, the slot structure 21 includes a first slot 211, a second slot 212, and a third slot 213 distributed along a first direction. The fixing part 11 is inserted into the first slot 211, the second slot 212, and the third slot 213 along a second direction to realize the installation of the bimetallic strip 1, which is convenient to operate. Specifically, the first end of the fixing part 11 is inserted into the first slot 211, the second end is inserted into the third slot 213, and the middle area of ​​the fixing part 11 is inserted into the second slot 212, so that the fixing part 11 has three fixing points along its length direction to ensure the stability of the installation.

[0066] Specifically, such as Figure 4 and Figure 5 As shown, the base 2 includes a top plate 22 and a bottom plate 23 spaced apart along a first direction. A side plate 24 connects the top plate 22 and the bottom plate 23. A first slot 211 is recessed in the top plate 22, and a third slot 213 is recessed in the bottom plate 23. A first limiting block 25 and a second limiting block 26 distributed along a third direction are protruding on the side plate 24. The first limiting block 25, the second limiting block 26, and the side plate 24 surround the aforementioned third slot 213. By protruding the first limiting block 25 and the second limiting block 26, the strength of the side plate 24 can be increased, the deformation resistance of the side plate 24 can be improved, and the entire circuit breaker casing can have higher strength.

[0067] Taking the fixed part 11 as a fixed frame 111 as an example, the two ends of the fixed frame 111 are respectively inserted into the first slot 211 and the third slot 213, and the middle part is inserted into the second slot 212.

[0068] like Figure 5 , Figure 6 as well as Figure 7 As shown, both the first slot 211 and the third slot 213 have a first sidewall 2111, a second sidewall 2112, and a first bottom wall. There are two second sidewalls 2112 along the third direction, and the first sidewall 2111 connects the two second sidewalls 2112. The first sidewall 2111 has an upper limit fixing portion 11 in the first direction, the second sidewall 2112 has an upper limit fixing portion 11 in the third direction, and the first bottom wall has an upper limit fixing portion 11 in the second direction. When the fixing portion 11 is inserted into the slot structure 21, it abuts against the first bottom wall, achieving a limit in the second direction. Simultaneously, the first sidewalls 2111 of both the first slot 211 and the third slot 213 abut against the two end faces of the fixing portion 11 in the first direction, achieving a limit in the first direction. The two opposite end faces of the fixing portion 11 along the third direction abut against the corresponding second sidewalls 2112, achieving a limit in the third direction.

[0069] In some optional embodiments, an adhesive structure is provided between the fixing part 11 and the inner wall of the slot structure 21. Providing an adhesive structure further improves the stability of the fixing part 11 within the slot structure 21. For example, adhesive is applied to the first slot 211, the second slot 212, and the third slot 213. Then, the fixing part 11 of the bimetallic strip 1 is inserted into the three slots. After the adhesive cures, the fixing part 11 can be securely installed on the base 2.

[0070] Furthermore, the circuit breaker also includes a top cover, which is fastened to the opening of the base 2 by a snap-fit ​​structure and / or screws, thereby confining the bimetallic strip 1, the arc-starting plate 4, the terminal block, and the tripping mechanism 3 within a closed space.

[0071] Example 2

[0072] Based on the same inventive concept as Embodiment 1, this embodiment provides a bimetallic strip 1 and a circuit breaker including the bimetallic strip 1, which differs from Embodiment 1.

[0073] In this embodiment, as Figure 8 As shown, the fixed part 11 includes a fixed plate 113, and a movable part 12 extends in the same direction as the fixed plate 113, with the movable part 12 located on one side of the fixed plate 113. That is, the fixed part 11 and the movable part 12 are distributed in the width direction of the bimetallic strip 1. The first end of the movable part 12 is connected to the fixed part 11, and the other end can deform relative to the fixed part 11. The fixed plate 113 is fixed by the mounting part 20 on the base 2, ensuring that it will not shift or deform. When the internal circuit of the circuit breaker is normal, the movable part 12 of the bimetallic strip 1 is flush with the fixed plate 113. When the internal circuit of the circuit breaker is overloaded, the movable part 12 of the bimetallic strip 1 deforms and bends relative to the fixed part 11 due to high temperature, such as... Figure 9 and Figure 10 As shown, the second end of the movable part 12 bends and deforms, pushing against the tripping rod 31 of the tripping mechanism 3, causing the tripping mechanism 3 to move and cut off the circuit.

[0074] When manufacturing the bimetallic strip 1, the rectangular strip of bimetal can be divided into fixed parts 11 and movable parts 12 by cutting and other processes. The process is simple and can ensure the overall strength of the bimetallic strip 1.

[0075] like Figure 8 As shown, there is a gap 13 between the movable part 12 and the outer wall of the fixed plate 113. The gap 13 prevents the fixed plate 113 and the movable part 12 from contacting each other, especially from contacting each other and causing friction due to thermal expansion and contraction. It also prevents the friction between the two from preventing the movable part 12 from bending and deforming relative to the fixed plate 113, thus ensuring the reliability of the overload protection function.

[0076] In this embodiment, the fixing piece 113 engages with the slot structure 21. For example... Figure 9 and Figure 10 As shown, the base 2 includes a top plate 22 and a bottom plate 23 spaced apart, with a side plate 24 connecting the top plate 22 and the bottom plate 23. The side plate 24 has a protruding limiting frame 27. The slot structure 21 includes a fourth slot 214 formed by the limiting frame 27 and the side plate 24. The fixing piece 113 is inserted into the fourth slot 214 as a whole, eliminating the need for multiple slots and ensuring high stability after installation. Specifically, the limiting frame 27 is approximately rectangular and annular to accommodate the rectangular fixing piece 113.

[0077] Specifically, such as Figure 10 As shown, the fourth slot 214 has two third sidewalls 2141 arranged opposite each other in a first direction, two fourth sidewalls 2142 arranged opposite each other in a third direction, and a second bottom wall abutting against the fixing piece 113 in a second direction. The third sidewalls 2141, fourth sidewalls 2142 and the second bottom wall abut against the fixing piece 113 to achieve limiting in the first direction, the second direction and the third direction.

[0078] Furthermore, an adhesive structure can also be provided in the fourth slot 214 to firmly bond the fixing piece 113 to the fourth slot 214.

[0079] It is understood that the bimetallic strip 1 in this embodiment can also be fixed using the solution in Embodiment 1, that is, the fixing piece 113 is installed on the base 2 through the first slot 211, the second slot 212 and the third slot 213. The bimetallic strip 1 in Embodiment 1 can also be fixed using the solution in Embodiment 2, that is, the fixing frame 111 is snapped into the fourth slot 214.

[0080] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A bimetallic sheet, characterized in that, The circuit breaker is used to provide overload protection for the circuit breaker, which includes a base (2) and a tripping mechanism (3) disposed on the base (2), and the base (2) is provided with a mounting part (20); The bimetallic strip includes: A fixing part (11) is configured to be fixed to the mounting part (20); Movable part (12), the first end of the movable part (12) is connected to the fixed part (11), the second end of the movable part (12) is configured to be linked with the tripping mechanism (3), the movable part (12) deforms relative to the fixed part (11) as the temperature changes, and drives the tripping mechanism (3) to move.

2. The bimetallic sheet according to claim 1, characterized in that, The fixed part (11) includes a fixed frame (111) that encloses a notch (112). The first end of the movable part (12) is connected to the inner wall of the notch (112), and the second end of the movable part (12) is located inside the notch (112) or extends out of the notch (112).

3. The bimetallic sheet according to claim 1, characterized in that, The fixed part (11) includes a fixed piece (113), the movable part (12) and the fixed piece (113) extend in the same direction, and the movable part (12) is located on one side of the fixed piece (113).

4. The bimetallic sheet according to any one of claims 1-3, characterized in that, There is a gap (13) between the outer wall of the movable part (12) facing the fixed part (11) and the fixed part (11).

5. A circuit breaker, characterized in that, It includes a base (2), a tripping mechanism (3), a terminal block, an arc-guiding plate (4), and a bimetallic strip as described in any one of claims 1-4; The base (2) is provided with a mounting part (20), which is used to fix the fixing part (11) of the bimetallic strip (1). The fixing part (11) is electrically connected to the terminal block and the arc-leading plate (4). The movable part (12) of the bimetallic strip (1) is linked with the tripping mechanism (3) to drive the tripping mechanism (3) to move.

6. The circuit breaker according to claim 5, characterized in that, The mounting part (20) includes a slot structure (21), the fixing part (11) engages with the slot structure (21), and the slot structure (21) limits the fixing part (11) in three mutually perpendicular directions.

7. The circuit breaker according to claim 6, characterized in that, The slot structure (21) includes a first slot (211), a second slot (212), and a third slot (213) distributed along a first direction; the fixing part (11) is inserted into the first slot (211), the second slot (212), and the third slot (213) along a second direction; Wherein, the first direction is the length direction of the bimetallic strip (1), and the second direction is the width direction of the bimetallic strip (1).

8. The circuit breaker according to claim 7, characterized in that, The base (2) includes a top plate (22) and a bottom plate (23) spaced apart along the first direction. A side plate (24) is connected between the top plate (22) and the bottom plate (23). A first slot (211) is recessed in the top plate (22), and a third slot (213) is recessed in the bottom plate (23). A first limiting block (25) and a second limiting block (26) distributed along a third direction are protruding on the side plate (24). The first limiting block (25), the second limiting block (26), and the side plate (24) surround the third slot (213). The third direction is the thickness direction of the bimetallic sheet (1). The first slot (211) and the third slot (213) each have a first sidewall (2111), a second sidewall (2112) and a first bottom wall. The first sidewall (2111) limits the fixing portion (11) in the first direction, the second sidewall (2112) limits the fixing portion (11) in the third direction, and the first bottom wall limits the fixing portion (11) in the second direction.

9. The circuit breaker according to claim 6, characterized in that, The base (2) includes a top plate (22) and a bottom plate (23) spaced apart. A side plate (24) is connected between the top plate (22) and the bottom plate (23). A limiting frame (27) is protruding from the side plate (24). The slot structure (21) includes a fourth slot (214) formed by the limiting frame (27) and the side plate (24).

10. The circuit breaker according to any one of claims 6-9, characterized in that, The fixing part (11) and the inner wall of the slot structure (21) are provided with an adhesive structure.

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