Thermal tripping assembly and circuit breaker

Abstract

The embodiment of the utility model provides a thermal tripping assembly and a circuit breaker. The thermal tripping assembly comprises a bimetallic element, a heating piece and a fixing piece. The heating piece abuts against one side of the bimetallic element. The fastener includes a first portion and a second portion. The first portion is disposed on a side of the heating member away from the bimetallic element, and is coupled to the heating member and the bimetallic element. The second portion is connected to the first portion and is securable to a housing of the circuit breaker. By means of the arrangement, the thermal tripping assembly can be installed on the shell of the circuit breaker through the fixing piece, an additional installation structure does not need to be arranged on the heating piece, the size of the heating piece can be reduced, the thermal tripping assembly can adapt to the space structure in the circuit breaker, and therefore the thermal tripping assembly is suitable for various types of circuit breakers.

Description

Technical Field

[0001] Embodiments of the present disclosure generally relate to the field of electrical equipment, and more particularly to a thermal trip assembly and a circuit breaker. Background Art

[0002] Thermal trip components are widely used in circuit breakers. They work by monitoring the thermal effects caused by long-term current overload. Thermal trip components can prevent damage or fire caused by overheating of electrical circuits and equipment. In a conventional thermal trip component, in order to adapt to a larger working current, a bypass heated bimetallic element can be used. Compared with the direct heated bimetallic element, the structure of the bypass heated bimetallic element has changed, and the space inside the circuit breaker is limited, which limits the installation and use of the bypass heated bimetallic element in different types of circuit breakers. Utility Model Content

[0003] An object of the embodiments of the present disclosure is to provide a thermal trip assembly and a circuit breaker to at least partially solve the above problems and other potential problems.

[0004] In a first aspect of the present disclosure, a thermal trip assembly is provided. The thermal trip assembly includes: a bimetallic element; a heating element abutting against one side of the bimetallic element; and a fixing element including: a first part disposed on a side of the heating element away from the bimetallic element and coupled to the heating element and the bimetallic element; and a second part connected to the first part and capable of being fixed to a housing of a circuit breaker.

[0005] In some embodiments, the second portion is a structure bent from an end portion of the first portion.

[0006] In some embodiments, the second portion is provided with a mounting hole, and the second portion can be fixed to the housing of the circuit breaker by a connector passing through the mounting hole.

[0007] In some embodiments, the first portion, the bimetallic element, and the heater are connected by fasteners extending therethrough.

[0008] In some embodiments, the bimetallic element and the heating element are both provided with a slot, and the fixing member further includes: a protrusion, which is provided on the side of the first part facing the heating element and is connected to the first part, and the protrusion is inserted into the slot of the bimetallic element and the heating element to limit the position of the bimetallic element and the heating element.

[0009] In some embodiments, the protrusion is a structure bent from the first portion.

[0010] In some embodiments, the heating element includes: a base, which is arranged between the bimetallic element and the first part, and coupled to the bimetallic element and the first part; a bending portion, which is arranged at one end of the base, and the bending portion is a structure bent from one end of the base; an extension portion, which is arranged at an end of the bending portion away from the base, and the extension portion is a structure bent from the end of the bending portion, and the extension portion is separated from the bimetallic element; and a wiring portion, which is arranged at an end of the base away from the extension portion and connected to the base, and the wiring portion extends in a direction away from the first part.

[0011] In some embodiments, the connecting portion is a structure bent from one end of the base.

[0012] In a second aspect of the present disclosure, a circuit breaker is provided, comprising: a housing; and a thermal trip assembly according to the first aspect of the present disclosure, wherein the thermal trip assembly is disposed in the housing, and the second portion of the fixing member is coupled to the housing.

[0013] In some embodiments, the housing is provided with a positioning hole, and the positioning hole is connected to the mounting hole of the second part through a connecting piece.

[0014] In some embodiments, the circuit breaker further includes: a load terminal coupled to the housing and connected to the extension of the heating element, and the positioning hole is located between the thermal trip assembly and the load terminal.

[0015] In an embodiment of the present disclosure, a thermal trip assembly includes a bimetallic element, a heating element, and a fixing element. The heating element abuts against one side of the bimetallic element. The fixing element includes a first part and a second part. The first part is disposed on a side of the heating element away from the bimetallic element and is coupled to the heating element and the bimetallic element. The second part is connected to the first part and can be fixed to the housing of the circuit breaker. With this arrangement, the thermal trip assembly can be mounted on the housing of the circuit breaker via the fixing element, and there is no need to provide an additional mounting structure on the heating element. The size of the heating element can be reduced, which helps the thermal trip assembly adapt to the spatial structure within the circuit breaker, thereby making the thermal trip assembly suitable for circuit breakers of various models.

[0016] It should be understood that the content described in this content section is not intended to limit the key features or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, wherein:

[0018] Figure 1A perspective view of a thermal trip assembly according to a first embodiment of the present disclosure is shown;

[0019] Figure 2 A perspective view of a thermal trip assembly according to a second embodiment of the present disclosure is shown;

[0020] Figure 3 A perspective view showing a fixing member according to a second embodiment of the present disclosure; and

[0021] Figure 4 A schematic diagram of the internal structure of a circuit breaker according to an embodiment of the present disclosure is shown.

[0022] Description of reference numerals:

[0023] 100. Thermal release assembly;

[0024] 10. Bimetallic element; 102. Card slot;

[0025] 20. Heating element; 21. Base; 22. Bending portion; 23. Extending portion; 24. Wiring portion;

[0026] 30. fixing member; 31. first part; 311. raised part; 32. second part; 321. mounting hole;

[0027] 40. Fasteners;

[0028] 200, Circuit breaker;

[0029] 210, housing; 211, positioning hole;

[0030] 220, load terminal;

[0031] 230. Connectors. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0033] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects.

[0034] As mentioned above, in conventional thermal trip assemblies, in order to adapt to a larger working current, a indirectly heated bimetallic element can be used. Compared with a directly heated bimetallic element, the structure of the indirectly heated bimetallic element has changed, and the space inside the circuit breaker is limited, which limits the installation and use of the indirectly heated bimetallic element in different types of circuit breakers.

[0035] The embodiment of the present disclosure provides a thermal trip assembly 100 and a circuit breaker 200. In the thermal trip assembly 100, a fixing member 30 is provided on one side of the heating element 20. With this arrangement, the thermal trip assembly 100 can be installed on the housing 210 of the circuit breaker 200 through the fixing member 30, and no additional mounting structure is required on the heating element 20, which can reduce the size of the heating element 20, and help the thermal trip assembly 100 adapt to the spatial structure in the circuit breaker 200, so that the thermal trip assembly 100 is suitable for circuit breakers 200 of various models.

[0036] The following will be combined Figures 1 to 3 To describe the principles of the present disclosure in detail, Figure 1 The structure of the thermal trip assembly 100 of the first embodiment of the present disclosure is shown. Figure 2 and Figure 3 The structure of the thermal trip assembly 100 of the second embodiment of the present disclosure is shown. Figure 1 The principle of the thermal trip assembly 100 according to the first embodiment of the present disclosure will be described in detail.

[0037] like Figure 1 As shown, the thermal trip assembly 100 is a temperature sensing device that can be installed inside the circuit breaker 200. When the current of the circuit is too large, the thermal trip assembly 100 can automatically cut off the power supply, thereby protecting the entire circuit system from damage. In an embodiment of the present disclosure, the thermal trip assembly 100 includes a bimetallic element 10, a heating element 20 and a fixing element 30.

[0038] The bimetallic element 10 is a strip structure formed by bonding two layers of different metals together, and the two layers of metal have different thermal expansion coefficients. When the temperature of the bimetallic element 10 rises, the bimetallic element 10 will bend due to the expansion difference between the two layers of metal. When the bimetallic element 10 bends to a certain extent, it will trigger the circuit breaker 200 to trip and cut off the power supply, thereby ensuring the safety of the circuit.

[0039] The heating element 20 is close to one side of the bimetallic element 10, and the heating element 20 is connected to the circuit in the circuit breaker 200. When the current of the circuit is too large, the temperature of the heating element 20 rises, and the heating element 20 transfers heat to the bimetallic element 10, thereby causing the bimetallic element 10 to bend.

[0040] like Figure 1As shown, in the embodiment of the present disclosure, the thermal trip assembly 100 further includes a fixing member 30, which can fix the thermal trip assembly 100 inside the circuit breaker 200. The fixing member 30 includes a first portion 31 and a second portion 32. The first portion 31 of the fixing member 30 is close to the heating element 20, and the first portion 31 is located on the side of the heating element 20 away from the bimetallic element 10. In this way, the fixing member 30 does not occupy the space on the side where the bimetallic element 10 is located. At the same time, the first portion 31 of the fixing member 30 is connected to both the heating element 20 and the bimetallic element 10, and the bimetallic element 10 and the heating element 20 can be fixed together. The second portion 32 is connected to the first portion 31, and the second portion 32 can be fixed to the housing 210 of the circuit breaker 200, thereby fixing the entire thermal trip assembly 100 on the housing 210 of the circuit breaker 200.

[0041] With such an arrangement, the thermal trip assembly 100 can be directly installed in the housing 210 of the circuit breaker 200, without the need to provide an additional mounting structure on the heating element 20. This allows the end of the heating element 20 close to the housing 210 to be made smaller and take up less space. In this way, the thermal trip assembly 100 can better adapt to the spatial layout inside circuit breakers 200 of different models, improving its versatility and scope of application. In other words, the same thermal trip assembly 100 can be suitable for use in a variety of circuit breakers.

[0042] As an example, the rated working current of a certain type of circuit breaker 200 is 100A. In order to adapt the circuit breaker 200 to a larger working current (for example, 160A), the original direct-heated thermal bimetallic element in the circuit breaker 200 can be replaced with the thermal trip assembly 100 provided in the embodiment of the present disclosure. The heating element 20 of the thermal trip assembly 100 is not provided with an additional mounting structure and will not interfere with other structures in the circuit breaker 200, so it can be directly installed in the housing 210 of the circuit breaker 200. At the same time, all or most of the remaining structures in the circuit breaker 200 can be universal, thereby reducing the cost of redesigning and manufacturing the new type of circuit breaker 200.

[0043] In some embodiments, Figure 1 As shown, the second portion 32 is a structure bent from the end of the first portion 31 .

[0044] like Figure 1 As shown, the second part 32 is arranged perpendicularly to the first part 31, and the second part 32 can be formed directly from the end of the first part 31 by a bending process. The second part 32 and the first part 31 are made of the same material, and there is no connection structure such as welding or bonding between them. In this way, the structure between the second part 32 and the first part 31 is more stable, which can save materials and reduce the complexity of the production process.

[0045] It should be understood that the second part 32 and the first part 31 may also be fixed together by any feasible means such as welding, riveting, bolt connection, snap connection, etc., and the present disclosure is not intended to be limited to this.

[0046] In some embodiments, Figure 1 As described above, the second portion 32 is provided with a mounting hole 321 , and the second portion 32 can be fixed to the housing 210 of the circuit breaker 200 by the connecting member 230 passing through the mounting hole 321 .

[0047] like Figure 1 As described above, a mounting hole 321 is provided on the second portion 32 of the fixing member 30 , and the connecting member 230 passes through the mounting hole 321 , thereby connecting the second portion 32 of the fixing member 30 with the housing 210 of the circuit breaker 200 .

[0048] As an example, the connector 230 may be a threaded member, which may be used in conjunction with the thread at the mounting hole 321 or the thread on the housing 210 of the circuit breaker 200 , and the threaded member may enable the thermal trip assembly 100 to be detachably connected to the housing of the circuit breaker 200 .

[0049] As another example, the connecting member 230 may be a pin that can be inserted into the mounting hole 321 to limit the relative movement between the second portion 32 of the fixing member 30 and the housing 210 of the circuit breaker 200 .

[0050] As another example, a hook may be provided in the housing 210 of the circuit breaker 200 , and the hook may be connected to the mounting hole 321 .

[0051] In the embodiment of the present disclosure, the fixing member 30 needs to fix the bimetallic element 10 and the heating element 20 to ensure that the bimetallic element 10 cooperates with the operating mechanism of the circuit breaker 200 .

[0052] In some embodiments, Figure 1 As shown, the first portion 31, the bimetallic element 10 and the heater 20 are connected by a fastener 40 passing therethrough.

[0053] like Figure 1 As shown, rivet holes are provided on the first part 31, the bimetallic element 10 and the heating element 20, and the fastener 40 is a rivet. The rivet passes through the rivet holes on the first part 31, the bimetallic element 10 and the heating element 20 at the same time, and the two ends of the rivet can be flattened and deformed, respectively abutting against the bimetallic element 10 and the fixing member 30, thereby realizing a permanent connection between the first part 31, the bimetallic element 10 and the heating element 20.

[0054] In some alternative embodiments, threaded holes are provided on the first part 31, the bimetallic element 10 and the heating element 20, and the fastener 40 is a threaded member. In this way, the first part 31, the bimetallic element 10 and the heating element 20 can be fixed together by aligning the threaded member with the threaded hole and rotating it.

[0055] It should be understood that the fastener 40 can be any achievable structure, and the present disclosure is not intended to be limited thereto.

[0056] In some embodiments, Figure 1 As shown, the heating element 20 includes a base 21, a bent portion 22 and an extension portion 23. The base 21 is disposed between the bimetallic element 10 and the first portion 31, and is coupled to the bimetallic element 10 and the first portion 31. The bent portion 22 is disposed at one end of the base 21, and the bent portion 22 is a structure bent from one end of the base 21. The extension portion 23 is disposed at one end of the bent portion 22 away from the base 21, and the extension portion 23 is a structure bent from the end of the bent portion 22, and the extension portion 23 is spaced apart from the bimetallic element 10.

[0057] With this arrangement, the bent portion 22 can space the extension portion 23 from the bimetallic element 10, and only the base 21 of the entire heating element 20 is in contact with the bimetallic element 10. When the circuit is energized, heat is transferred only from the base 21 to the bimetallic element 10. The heat of the bent portion 22 and the extension portion 23 has little interference with the bimetallic element 10. When assembling the thermal trip assembly 100, even if the thermal trip assembly 100 assembled by different installers has a slight deviation, it will not affect the performance of the thermal trip assembly 100, thereby ensuring the stable performance of the circuit breaker 200.

[0058] In some embodiments, Figure 1 As shown, the distance between the extension portion 23 and the bimetallic element 10 is a safety distance, and the safety distance is positively correlated with the rated operating current of the circuit. For example, when the current flowing through the extension portion 23 is 100A, the safety distance can be 0.3cm. When the current flowing through the extension portion 23 is 160A, the heat generated by the extension portion 23 increases, and the safety distance can be adjusted to 0.5cm. It should be understood that the above safety distances are only exemplary, and the present disclosure is not intended to limit specific values.

[0059] In some embodiments, Figure 1 As shown, the heating element 20 further includes a wiring portion 24 . The wiring portion 24 is disposed at one end of the base 21 away from the extension portion 23 , and the wiring portion 24 is connected to the base 21 , and extends in a direction away from the first portion 31 .

[0060] like Figure 1As shown, the wiring portion 24 will not interfere with the installation of the fixing member 30, thereby making the layout of the entire thermal release assembly 100 more reasonable. Through the wiring portion 24, the heating element 20 can be connected to the circuit, allowing the current in the circuit to flow through the heating element 20, thereby generating heat. When the current exceeds the safety threshold, the heating element 20 will heat up, thereby triggering the bending of the bimetallic element 10, and finally causing the circuit breaker 200 to trip, thereby playing the role of overload protection. The wiring portion 24 can facilitate the connection of cables. When assembling the circuit breaker 200, workers can quickly connect the cables to the heating element 20, thereby improving the efficiency and accuracy of assembly.

[0061] In some embodiments, Figure 1 As shown, the wiring portion 24 is a structure formed by bending from one end of the base 21. In this way, the wiring portion 24 and the base 21 are integrally formed, and there is no additional welding or bonding point between the two. By bending at one end of the base 21, a bending portion with an angle of 90 degrees or more can be formed to make the wiring portion 24. The bent structure can not only enhance the mechanical strength of the wiring portion 24, but also ensure the stability of the connection between the wiring portion 24 and the base 21, reducing the risk of loosening or breaking that may occur during long-term use.

[0062] The following will be combined Figure 2 and Figure 3 The principle of the thermal trip assembly 100 of the second embodiment of the present disclosure is described in detail. The structure and combination of the thermal trip assembly 100 of the second embodiment Figure 1 A part of the structure of the first embodiment described is similar. In the following, the difference between them will be mainly described, and the same parts will not be repeated.

[0063] like Figure 2 and Figure 3 As shown, the fixing member 30 can be connected to the bimetallic element 10 and the heating element 20 by snap-fitting. For example, the bimetallic element 10 and the heating element 20 are both provided with a snap-fitting slot 102, and a protrusion 311 is provided on the side of the first part 31 of the fixing member 30 facing the heating element 20, and the protrusion 311 is connected to the first part 31. The snap-fitting slot 102 can match the protrusion 311 on the fixing member 30. When the protrusion 311 is docked with the snap-fitting slot 102, the protrusion 311 can be inserted into the snap-fitting slot 102 of the bimetallic element 10 and the heating element 20.

[0064] With this arrangement, the protrusion 311 can limit the position of the bimetallic element 10 and the heating element 20, preventing them from moving or shaking inside the circuit breaker 200, thereby helping to ensure the stable operation of the circuit breaker 200. In addition, the protrusion 311 can also simplify the assembly process of the thermal trip assembly 100, improving assembly efficiency and product quality.

[0065] In some embodiments, Figure 2 and Figure 3 As shown, the protrusion 311 is a structure bent from the first portion 31 .

[0066] like Figure 2 and Figure 3 As shown, the protrusion 311 and the first part 31 are made of the same material, and the protrusion 311 is made by changing the shape of part of the material of the first part 31 (for example, the middle part). There is no trace of welding or bonding between the protrusion 311 and the first part 31, which can increase the strength and stability of the structure and reduce the risk of wear or damage of the protrusion 311 when used for a long time or subjected to external forces. Secondly, the protrusion 311 is formed by a bending process, which can simplify the production process, reduce production costs, and reduce the complexity of the assembly process.

[0067] In a second aspect of the present disclosure, Figure 4 As shown, a circuit breaker 200 is provided. The circuit breaker 200 comprises a housing 210 and a thermal trip assembly 100 according to the first aspect of the present disclosure. The thermal trip assembly 100 is disposed in the housing 210 , and the second portion 32 of the fixing member 30 is coupled to the housing 210 .

[0068] In an embodiment of the present disclosure, the thermal trip assembly 100 of the circuit breaker 200 includes a bimetallic element 10, a heating element 20, and a fixing element 30. The heating element 20 abuts against one side of the bimetallic element 10. The fixing element 30 includes a first portion 31 and a second portion 32. The first portion 31 is disposed on a side of the heating element 20 away from the bimetallic element 10, and is coupled to the heating element 20 and the bimetallic element 10. The second portion 32 is connected to the first portion 31 and can be fixed to the housing 210 of the circuit breaker 200. With this arrangement, the thermal trip assembly 100 can be installed on the housing 210 of the circuit breaker 200 through the fixing element 30, and no additional mounting structure is required on the heating element 20, which can reduce the size of the heating element 20, and help the thermal trip assembly 100 adapt to the spatial structure in the circuit breaker 200, so that the thermal trip assembly 100 is suitable for circuit breakers 200 of various models.

[0069] In some embodiments, Figure 4 As shown, the housing 210 is provided with a positioning hole 211 . The positioning hole 211 is connected to the mounting hole 321 of the second part 32 via a connecting member 230 .

[0070] like Figure 4 As shown, a positioning hole 211 is provided on the side wall of the housing 210, and a mounting hole 321 is provided on the second portion 32. The connecting member 230 passes through the mounting hole 321 and the positioning hole 211, thereby connecting the second portion 32 of the fixing member 30 with the housing 210 of the circuit breaker 200.

[0071] For example, the connecting member 230 may be a threaded member, which may cooperate with the thread at the mounting hole 321 or the positioning hole 211 , so that the thermal trip assembly 100 can be detachably mounted on the housing 210 of the circuit breaker 200 .

[0072] In some embodiments, Figure 4 As shown, the circuit breaker 200 further includes a load terminal 220. The load terminal 220 is coupled to the housing 210, and the load terminal 220 is connected to the extension 23 of the heating element 20. The positioning hole 211 is located between the thermal trip assembly 100 and the load terminal 220. With this arrangement, the second portion 32 of the fixing member 30 is disposed in the area between the load terminal 220 and the housing 210, which does not occupy additional space in the circuit breaker 200, and helps the thermal trip assembly 100 adapt to the spatial structure in the circuit breaker 200, so that the thermal trip assembly 100 is applicable to circuit breakers 200 of various models.

[0073] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A thermal trip assembly (100), characterized in that: include: Bimetallic element (10); A heating element (20) abutting against one side of the bimetallic element (10); as well as The fixing member (30) comprises: A first portion (31) is disposed on a side of the heating element (20) away from the bimetallic element (10) and is coupled to the heating element (20) and the bimetallic element (10); as well as The second part (32) is connected to the first part (31) and can be fixed to the housing (210) of the circuit breaker (200).

2. The thermal release assembly (100) according to claim 1, characterized in that: The second part (32) is a structure formed by bending the end of the first part (31).

3. The thermal release assembly (100) according to claim 1, characterized in that: The second part (32) is provided with a mounting hole (321), and the second part (32) can be fixed to the housing (210) of the circuit breaker (200) via a connecting piece (230) passing through the mounting hole (321).

4. The thermal release assembly (100) according to any one of claims 1 to 3, characterized in that: The first portion (31), the bimetallic element (10) and the heating element (20) are connected by a fastener (40) passing therethrough.

5. The thermal release assembly (100) according to any one of claims 1 to 3, characterized in that: The bimetallic element (10) and the heating element (20) are both provided with a slot (102), and the fixing element (30) further comprises: A protrusion (311) is arranged on a side of the first part (31) facing the heating element (20) and is connected to the first part (31), and the protrusion (311) is inserted into the slots (102) of the bimetallic element (10) and the heating element (20) to limit the positions of the bimetallic element (10) and the heating element (20).

6. The thermal release assembly (100) according to claim 5, characterized in that: The protruding portion (311) is a structure formed by bending the first portion (31).

7. The thermal trip assembly (100) according to any one of claims 1 to 3, characterized in that: The heating element (20) comprises: a base (21) disposed between the bimetallic element (10) and the first portion (31), and coupled to the bimetallic element (10) and the first portion (31); A bending portion (22) is arranged at one end of the base portion (21), and the bending portion (22) is a structure formed by bending from one end of the base portion (21); an extension portion (23) disposed at one end of the bent portion (22) away from the base portion (21), wherein the extension portion (23) is a structure formed by bending from the end of the bent portion (22), and the extension portion (23) is spaced apart from the bimetallic element (10); and A connecting portion (24) is provided at one end of the base (21) away from the extending portion (23) and connected to the base (21), and the connecting portion (24) extends in a direction away from the first portion (31).

8. The thermal release assembly (100) according to claim 7, characterized in that: The connecting portion (24) is a structure formed by bending from one end of the base portion (21).

9. A circuit breaker (200), characterized in that: include: Housing (210); as well as The thermal release assembly (100) according to any one of claims 1 to 8 is arranged in the housing (210), and the second part (32) of the fixing member (30) is coupled to the housing (210).

10. The circuit breaker (200) according to claim 9, characterized in that: The housing (210) is provided with a positioning hole (211), and the positioning hole (211) is connected to the mounting hole (321) of the second part (32) via a connecting piece (230).

11. The circuit breaker (200) according to claim 10, characterized in that: Also includes: A load terminal (220) is coupled to the housing (210) and connected to the extension portion (23) of the heating element (20), and the positioning hole (211) is located between the thermal release assembly (100) and the load terminal (220).

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