Conductive assembly and molded case circuit breaker

Abstract

The utility model discloses a conductive assembly and a molded case circuit breaker. The conductive assembly comprises a first terminal board, a first conductive part, a bimetallic strip and a second conductive part, one end of the first terminal plate is welded with one end of the coil, and the other end of the coil is welded with the first connecting part of the first conductive piece; the fixed end of the bimetallic strip, the second connecting part of the first conductive piece and one end of the second conductive piece are fixed together through welding or riveting; wherein the conductivity of the first conductive part is higher than that of the second conductive part, and the conductivity of a material used by the first conductive part is also better than that of a material used by the second conductive part; the first conductive piece further comprises a connecting part, the connecting part connects the first connecting part and the second connecting part, and the conductor sectional area at any position of the connecting part is not smaller than the conductor sectional area at any position of the second connecting part; the welding structure has the characteristic that the welding of the coil and the first conductive piece is more stable.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical appliances, specifically a conductive component, and more specifically a conductive component in a molded case circuit breaker. Background Technology

[0002] In molded case circuit breakers, there are two common thermal-magnetic tripping structures: one is a combination of a bimetallic strip and a snap-action electromagnetic trip unit, and the other is a combination of a bimetallic strip and a solenoid electromagnetic trip unit.

[0003] As a combination of bimetallic strip and solenoid electromagnetic trip unit, since the solenoid electromagnetic trip unit must have a coil, it must be connected to other conductors by welding.

[0004] like Figure 10 The conductive structure of this molded case circuit breaker includes a first terminal block, a coil (the coil of an electromagnetic trip unit), a first conductive element (also called a thermal element), a bimetallic strip, and a second conductive element. The first terminal block is welded to one end of the coil, and the other end of the coil is welded to the first end of the first conductive element. A second connecting portion, the fixed end of the bimetallic strip, and the second conductive element are welded together. The first and second conductive elements are made of the same material.

[0005] Since overload protection of circuit breakers relies on the bending of the bimetallic strip, a portion of the first conductive element is often made into an inclined structure as shown in the figure to make the bimetallic strip easier to bend. This reduces the cross-sectional area Z3 through which the current flows (smaller than the conductor cross-sectional area Z2 at the second end of the first conductive element; generally, the conductor cross-sectional area Z1 at the first end of the first conductive element is larger than the conductor cross-sectional area Z2 at the second end), thereby increasing resistance, increasing heat generation, and making the bimetallic strip more prone to deformation. This inclined structure is often located between the first and second ends of the first conductive element, usually closer to the first end.

[0006] As mentioned above, the tilted structure leads to increased resistance and increased local heat generation. This structure brings the heat source closer to the first end of the first conductive element. Since the first end of the first conductive element is welded to one end of the coil, bringing the heat source close to the first end of the first conductive element may cause the weld between the first conductive element and the coil to detach (especially since the cross-section of this type of coil is generally circular, and the welding area with the first conductive element is relatively limited), resulting in an irreversible permanent open circuit at that point.

[0007] Therefore, how to provide a novel conductive structure is a direction worth exploring. Summary of the Invention

[0008] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and to provide a conductive component and a molded case circuit breaker.

[0009] This application provides: a conductive component comprising a first terminal plate, a first conductive element, a bimetallic strip, and a second conductive element; one end of the first terminal plate is welded to one end of a coil, and the other end of the coil is welded to a first connecting portion of the first conductive element; the fixed end of the bimetallic strip, the second connecting portion of the first conductive element, and one end of the second conductive element are fixed together by welding or by riveting; wherein, the conductivity of the first conductive element is stronger than that of the second conductive element, and the conductivity of the material used in the first conductive element is also superior to that of the material used in the second conductive element; the first conductive element further includes a connecting portion that connects the first connecting portion and the second connecting portion, wherein the conductor cross-sectional area at any point of the connecting portion is not less than the conductor cross-sectional area at any point of the second connecting portion.

[0010] In some embodiments of this application, the conductor cross-sectional area of ​​the connecting portion near the first connecting portion is greater than the conductor cross-sectional area of ​​the connecting portion near the second connecting portion.

[0011] In some embodiments of this application, the connecting portion includes a transition segment and a stable segment. One end of the transition segment is connected to a first connecting portion, one end of the stable segment is connected to the other end of the transition segment, and the other end of the stable segment is connected to a second connecting portion. The conductor cross-sectional areas at different points along the transition segment are not exactly the same, and the conductor cross-sectional area at any point along the transition segment is larger than the conductor cross-sectional area at any point along the stable segment. In some embodiments of this application, the entire transition segment is a gradual transition segment or a portion of it is a gradual transition segment. One end of the gradual transition segment is connected to the stable segment. The conductor cross-sectional areas at different points along the gradual transition segment are in the following order: the conductor cross-sectional area closer to the stable segment is smaller, and the conductor cross-sectional area farther away from the stable segment is larger.

[0012] In some embodiments of this application, the connecting portion includes a front surface, a rear surface, a left side surface, and a right side surface. The distance between the front surface and the rear surface of the connecting portion is the thickness dimension, and the distance between the left side surface and the right side surface is the width dimension. The product of the thickness dimension and the width dimension at each point of the connecting portion constitutes the conductor cross-sectional area at each point. The thickness dimension at each point of the connecting portion tends to be consistent. Due to the difference in the width dimension, the conductor cross-sectional area at any point of the changing segment is greater than the conductor cross-sectional area at any point of the stable segment.

[0013] In some embodiments of this application, the entire changing segment is a gradual segment or a portion of a segment is a gradual segment, with one end of the gradual segment connected to the stable segment; the portion on the left side located in the gradual segment is the first part, and the portion on the right side located in the gradual segment is the second part. One of the first part and the second part is inclined or curved, and the other is vertical, so that the conductor cross-sectional area at various points in the gradual segment is smaller closer to the stable segment and larger further away from the stable segment.

[0014] In some embodiments of this application, the fixed end of the bimetallic strip is sandwiched between the second connecting portion and the second conductive element.

[0015] In some embodiments of this application, the first conductive element is made of copper, and the second conductive element is made of brass or constantan.

[0016] In some embodiments of this application, a transition section is also included, through which the second connecting portion is connected to the connecting portion. The transition section extends at an angle away from the bimetallic strip, so that there is a distance between the connecting portion and the bimetallic strip.

[0017] A molded case circuit breaker includes an operating mechanism and a base: wherein at least two sets of the aforementioned conductive components are disposed on the base.

[0018] In some embodiments of this application, an operating mechanism and a rotating shaft are included, the rotating shaft being rotatably arranged with respect to the base; the operating mechanism includes two spaced-apart lower connecting rods, one end of which is connected by a pin; a through hole is provided on the rotating shaft, through which the pin passes so that the two lower connecting rods can drive the rotating shaft to rotate; the wall of the through hole is closed.

[0019] The advantages of this application compared to the prior art are:

[0020] In the prior art, the first conductive element and the second conductive element are made of the same material. It can only rely on the reduced conductor cross-sectional area of ​​the inclined structure (the connection part of the prior art) to ensure a certain resistance, so that the bimetallic strip can be bent and perform overload protection.

[0021] In this application, a certain resistance is ensured by changing the material of the second conductive element in combination with changing the size of the connection part (increasing the cross-sectional area of ​​the conductor). This ensures that the bimetallic strip can be bent (when performing overload protection) and that the heat generated is kept away from the part where the coil is welded to the first conductive element, making the welded part more stable. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A perspective view of a molded case circuit breaker according to an embodiment of this application is shown;

[0024] Figure 2 This diagram shows a molded case circuit breaker according to an embodiment of the present application after removing components such as the center cover;

[0025] Figure 3 A schematic diagram of the operating mechanism and rotating shaft in an embodiment of this application is shown;

[0026] Figure 4 An exploded view of the rotating shaft, lower connecting rod, and pin in an embodiment of this application is shown;

[0027] Figure 5 A schematic diagram of the conductive component in an embodiment of this application is shown;

[0028] Figure 6 A side view of the conductive component after the coil is removed in an embodiment of this application is shown;

[0029] Figure 7 A front view of the first conductive element in an embodiment of this application is shown;

[0030] Figure 8 A perspective view of the first conductive element in an embodiment of this application is shown;

[0031] Figure 9 A schematic diagram of a conductor cross-section in the first conductive element of this application is shown;

[0032] Figure 10 A schematic diagram of a conductive component in the prior art is shown. Detailed Implementation

[0033] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0034] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, 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, and therefore should not be construed as a limitation of this application.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 application according to the specific circumstances.

[0037] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. Example

[0038] like Figure 1-9 As shown, an embodiment of this application is a molded case circuit breaker, which includes a base 100 and an operating mechanism.

[0039] The base 100 is made of insulating material and is part of the circuit breaker housing. The base 100 has space for the main circuit conductors. Since the molded case circuit breaker in this embodiment is a 3-pole molded case circuit breaker, there are three main circuit conductor installation spaces, which are arranged sequentially along the width of the base 100.

[0040] The operating mechanism includes a frame, handle, lever, trip latch, locking latch, re-latch, main tension spring, upper connecting rod, and lower connecting rod 200. The handle, as the input end of the operating mechanism, can be moved under user control. The lower connecting rod 200, as the output end of the operating mechanism, drives the rotating shaft 300 to rotate, thus opening and closing the circuit breaker. The connections and motion relationships between the components of the operating mechanism are common knowledge in the field and will not be described in detail.

[0041] The rotating shaft 300 is rotatably mounted to the base 100. There are two lower connecting rods 200 connected by a pin 400. The rotating shaft 300 has a through hole 301 through which the pin 400 passes, allowing the lower connecting rods 200 to drive the rotating shaft 300 to rotate. Here, the wall of the through hole 301 is closed, meaning that the through hole 301 is separated from the chamber on the rotating shaft 300 where the moving contact is located. This increases the creepage distance and prevents electrical conduction from the moving contact into the operating mechanism.

[0042] The structure of the main circuit conductors of each pole is basically the same, and they all include stationary contacts, moving contacts, and conductive components.

[0043] One end of the stationary contact is the second terminal block, which is used for wiring to the outside.

[0044] The moving contact is mounted on the rotating shaft 300, and can make contact with and separate from the stationary contact as the rotating shaft 300 moves.

[0045] The conductive component includes a first terminal plate 410, a first conductive element 420, a coil 430, a bimetallic strip 450, and a second conductive element 440.

[0046] One end of the second conductive element 440 is electrically connected to the moving contact. This electrical connection includes both flexible connection (which can be understood as flexible copper wire) welding and rigid connection structure (the second conductive element 440 forms a rotating seat, and the moving contact is hinged in the rotating seat, so that the moving contact and the rotating seat are always in contact to achieve conductivity).

[0047] The first terminal block 410 is used for external wiring.

[0048] Coil 430 is a component of the solenoid-type electromagnetic trip unit. The solenoid-type trip unit is a functional component for short-circuit protection, which is common knowledge in the field and will not be described further here. One end of coil 430 is welded to the first terminal plate 410, and the other end of coil 430 is welded to the first connecting portion 420a of the first conductive element 420.

[0049] The first conductive element 420 includes a first connecting portion 420a, a connecting portion 420b, and a second connecting portion 420c. The first connecting portion 420a and the second connecting portion 420c are the two ends of the first conductive element 420. Here, the first connecting portion 420a and the second connecting portion 420c are connected through the connecting portion 420b. Each of the first connecting portion 420a, the second connecting portion 420c, and the connecting portion 420b contains numerous conductor cross-sections through which current flows. However, for the connecting portion 420b, the conductor cross-sectional area at any point is not less than the conductor cross-sectional area at any point in the second connecting portion 420c. The purpose of this arrangement is to transfer the heat concentration area R (the heat concentration area R of the conductive component), so that the heat concentration area R is no longer the same as in the prior art (in the prior art, the heat concentration area R is located in the first connecting portion 420a near the connecting portion 420b).

[0050] The bimetallic strip 450 has a movable terminal 450a at one end and a fixed terminal 450b at the other end. When an overload occurs in the main line, protection is provided by the movable terminal 450a.

[0051] The second connecting portion 420c of the first conductive element 420, the fixed end 450b of the bimetallic strip 450, and the other end of the second conductive element 440 are connected together. Welding is used for fixing in this embodiment, but riveting can also be used. There are many ways to arrange the second connecting portion 420c of the first conductive element 420, the fixed end 450b of the bimetallic strip 450, and the other end of the second conductive element 440. They can be arranged such that the bimetallic strip 450 and the first conductive element 420 sandwich the second conductive element 440, or the first conductive element 420 and the second conductive element 440 sandwich the bimetallic strip 450, or the bimetallic strip 450 and the second conductive element 440 sandwich the first conductive element 420. As a preferred embodiment, the fixed end 450b of the bimetallic strip 450 is sandwiched between the second connecting portion 420c and the second conductive element 440.

[0052] The conductivity of the first conductive element 420 is stronger than that of the second conductive element 440. This is achieved through the difference in conductive materials; that is, the conductivity of the material of the first conductive element 420 is superior to that of the material of the second conductive element 440. In this embodiment, the first conductive element 420 is made of copper, and the second conductive element 440 is made of brass. Of course, the second conductive element 440 can also be made of constantan. Furthermore, the material of the first conductive element can be set to brass, and the material of the second conductive element can be set to constantan, as long as it can be ensured that the conductivity of the first conductive element 420 is stronger than that of the second conductive element 440.

[0053] This material change results in different conductivity properties, making the resistance of the second conductive element 440 greater than that of the first conductive element 420. This concentrates the heat generated by the conductive component at the fixed end 450b of the second conductive element 440 and the bimetallic strip 450, which is beneficial for the deformation of the bimetallic strip 450. Simultaneously, this material change (increasing the resistance of the second conductive element 440 compared to existing technology), combined with the dimensional change of the connecting portion 420b (where the cross-sectional area of ​​any conductor at the connecting portion 420b (S1, S2 in the figure) is not less than the cross-sectional area of ​​any conductor at the second connecting portion 420c (Sa in the figure), reducing the resistance of the first conductive element 420 compared to existing technology), comprehensively ensures that the conductive component has suitable resistance, allowing it to generate heat and cause the bimetallic strip 450 to bend (during overload protection). With this structure, the heat concentration area R of the conductive component will be far away from the part where the coil 430 is welded to the first conductive element 420, making this welding structure more stable.

[0054] For the connecting part 420b, the conductor cross-sectional area at each point can be constant (although constant, it must be ensured that none of them are less than the conductor cross-sectional area at any point of the second connecting part 420c), or multiple different conductor cross-sectional areas can be used.

[0055] Taking one type of conductor cross-sectional area structure with multiple different locations as an example, the connecting portion 420b has a portion near the first connecting portion 420a and a portion near the second connecting portion 420c. The conductor cross-sectional area of ​​the portion near the first connecting portion 420a is larger than the conductor cross-sectional area near the second connecting portion 420c, for example... Figure 7 As shown, the conductor cross-sectional area S1 of the portion near the first connection 420a is greater than the conductor cross-sectional area S2 of the portion near the second connection 420c.

[0056] There are many ways to form a conductor cross-sectional area near the first connecting portion 420a that is larger than the conductor cross-sectional area near the second connecting portion 420c. Taking one example, the connecting portion 420b includes a transition segment 420b1 and a stable segment 420b2. One end of the transition segment 420b1 is connected to the first connecting portion 420a, one end of the stable segment 420b2 is connected to the other end of the transition segment 420b1, and the other end of the stable segment 420b2 is connected to the second connecting portion 420c.

[0057] Here, the conductor cross-sectional area at each point in the variation segment 420b1 is not exactly the same. This does not mean that every single point is different, but rather that there are at least two or more points where the conductor cross-sectional area is different. Because there are different conductor cross-sectional areas, it is called variation segment 420b1.

[0058] Here, the conductor cross-sectional area at various points in the stable section 420b2 approaches uniformity (approaching the conductor cross-sectional area at any point in the second connection 420c).

[0059] In any case, the conductor cross-sectional area at any point in the changing segment 420b1 is greater than the conductor cross-sectional area at any point in the stable segment 420b2.

[0060] There are many ways to form this transition segment 420b1. As a preferred method, a portion of the transition segment 420b1 is designated as a gradient segment B, which is connected to the stable segment 420b2. Here, the conductor cross-sectional area at various points in the gradient segment B is related as follows: the conductor cross-sectional area is smaller closer to the stable segment 420b2, and larger further away from the stable segment 420b2. Simply put, in the gradient segment B, the conductor cross-sectional area is directly proportional to its distance from the stable segment 420b2. In this structure, in addition to the gradient segment B, the transition segment 420b1 also includes a segment connected to the first connecting part 420a. Of course, alternatively, the entire transition segment 420b1 can be made into a gradient segment B.

[0061] The setting of this gradual transition segment B will be beneficial to production and processing, and will also facilitate the flow of current.

[0062] Since the connecting portion 420b includes a front surface M1, a rear surface M2, a left side surface M3, and a right side surface M4, the distance between the front surface M1 and the rear surface M2 of the connecting portion 420b is the thickness dimension D, and the distance between the left side surface M3 and the right side surface M4 is the width dimension L. The product of the thickness dimension D and the width dimension L at each point of the connecting portion 420b constitutes the conductor cross-section at that point. Therefore, there are many ways to achieve differences in conductor cross-sectional areas (differences refer to the size relationships of the conductor cross-sectional areas mentioned above). For example, the width dimension L is the same at each point, but the thickness dimension D is different, resulting in differences in conductor cross-sectional areas. Another example is that the width dimension L is different at each point, but the thickness dimension D is the same, resulting in differences in conductor cross-sectional areas. Yet another example is that both the width dimension L and the thickness dimension D are different, resulting in differences in conductor cross-sectional areas.

[0063] In this embodiment, the thickness D of the connecting portion 420b is approximately uniform, or rather, identical (since there will inevitably be errors, the expression "approaching uniform" is more accurate). The difference in conductor cross-sectional area at each location is due to the difference in width L. This method simplifies the forming of the connecting portion 420b.

[0064] Taking the aforementioned gradient segment B as an example, the portion of the left side M3 within gradient segment B is the first part M31, and the portion of the right side M4 within gradient segment B is the second part M41. Here, the first part M31 is curved, and the second part M41 is vertical, forming the gradient segment above. Of course, the first part M31 can also be made slanted. As an alternative, the first part M31 can be made vertical, and the second part M41 can be made slanted or curved.

[0065] In any case, the gradient segments formed in this way are very easy to shape, and the cross-sectional area of ​​the conductors at each point is easy to fill in the void.

[0066] To facilitate the deformation of the bimetallic strip 450, or to make its deformation more ideal, the second connecting portion 420c connects to the connecting portion 420b via a transition section 420d. The transition section 420d extends obliquely away from the bimetallic strip 450, creating a distance H between the connecting portion 420b and the bimetallic strip 450. This concentrates the heat received by the bimetallic strip 450 at its fixed end 450b, further promoting its deformation.

[0067] Of course, the above structure is not only applicable to three-pole molded case circuit breakers, but also to two-pole and four-pole molded case circuit breakers. Similarly, these molded case circuit breakers can be thermo-magnetic, electronic, or electrically operated.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An electrically conductive assembly comprising a first terminal plate, a first electrically conductive member, a bimetallic strip, and a second electrically conductive member; one end of the first terminal plate is welded to one end of a coil, the other end of the coil is welded to a first connecting portion of the first electrically conductive member; a fixed end of the bimetallic strip, a second connecting portion of the first electrically conductive member, and one end of the second electrically conductive member are fixed together by welding or riveting; characterized in that: The first conductive member has stronger conductivity than the second conductive member, and the material of the first conductive member has stronger conductivity than the material of the second conductive member; the first conductive member further comprises a connecting portion, the connecting portion connects the first connecting portion and the second connecting portion, and the conductor cross-sectional area of any position of the connecting portion is not less than the conductor cross-sectional area of any position of the second connecting portion.

2. An electrically conductive assembly according to claim 1, wherein: The conductor cross-sectional area of the connecting portion near the first connecting portion is greater than the conductor cross-sectional area of the connecting portion near the second connecting portion.

3. An electrically conductive assembly according to claim 2, wherein: The connecting portion comprises a changing section and a stable section, one end of the changing section is connected with the first connecting portion, one end of the stable section is connected with the other end of the changing section, and the other end of the stable section is connected with the second connecting portion; the conductor cross-sectional area of any position of the changing section is not completely the same, and the conductor cross-sectional area of any position of the changing section is greater than the conductor cross-sectional area of any position of the stable section.

4. An electrically conductive assembly according to claim 3, wherein: The changing section is a gradual section or a part of the section is a gradual section, one end of the gradual section is connected with the stable section, and the conductor cross-sectional area of any position of the gradual section is in a relationship that the closer to the stable section, the smaller the conductor cross-sectional area, and the farther away from the stable section, the greater the conductor cross-sectional area.

5. An electrically conductive assembly according to claim 3, wherein: The connecting portion comprises a front surface, a rear surface, a left side surface and a right side surface, the distance between the front surface and the rear surface is a thickness dimension, the distance between the left side surface and the right side surface is a width dimension, and the product of the thickness dimension and the width dimension of any position of the connecting portion constitutes the conductor cross-sectional area of the position; the thickness dimension of any position of the connecting portion is close to the same, and the width dimension is different, so that the conductor cross-sectional area of any position of the changing section is greater than the conductor cross-sectional area of any position of the stable section.

6. An electrically conductive assembly according to claim 5, wherein: The changing section is a gradual section or a part of the section is a gradual section, one end of the gradual section is connected with the stable section; the part of the left side surface in the gradual section is a first part, the part of the right side surface in the gradual section is a second part, one of the first part and the second part is inclined or arc-shaped, and the other is vertical, so that the conductor cross-sectional area of any position of the gradual section is in a relationship that the closer to the stable section, the smaller the conductor cross-sectional area, and the farther away from the stable section, the greater the conductor cross-sectional area.

7. The conductive assembly of claim 1, wherein: The fixed end of the bimetallic strip is clamped by the second connecting portion and the second conductive member; and / or the material of the first conductive member is red copper, and the material of the second conductive member is brass or constantan.

8. The conductive assembly of claim 1, wherein: The second connecting portion is connected with the connecting portion through a transition section, the transition section extends obliquely away from the direction of the bimetallic strip, so that there is a distance between the connecting portion and the bimetallic strip.

9. A molded case circuit breaker comprising an operating mechanism and a base: characterized in that: The base is provided with at least two groups of the conductive assembly as claimed in any one of claims 1-8.

10. The molded case circuit breaker of claim 9, wherein: The operating mechanism comprises two spaced-apart lower connecting rods, one end of the two lower connecting rods is connected through a pin shaft, a through hole is formed in the rotating shaft, the pin shaft is arranged in the through hole, so that the two lower connecting rods can drive the rotating shaft to rotate, and the hole wall of the through hole is closed.

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