Operating mechanism and circuit breaker

Abstract

The invention provides an operating mechanism and a circuit breaker, and relates to the technical field of low-voltage electric appliances. The operating mechanism comprises a moving contact assembly and a torsion spring, the moving contact assembly comprises a mechanism seat and a moving contact arranged on the mechanism seat, the torsion spring comprises a torsion spring body, a first torsion arm and a second torsion arm, the torsion spring body is arranged on the moving contact assembly, and the axis of the torsion spring body and the rotation axis of the mechanism seat are not overlapped. The first torsion arm abuts against the moving contact assembly so as to apply closing force to the moving contact in the closing state, the second torsion arm abuts against the shell so as to apply pressing force to the shell in the closing state, and the counter force of the closing force and the counter force of the pressing force jointly provide opening reset force of the mechanism base. According to the structure, parts are reduced, the occupied space is small, and cost is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-voltage electrical apparatus, in particular to an operating mechanism and a circuit breaker. BACKGROUND

[0002] The circuit breaker is the most important control device in the power system and is also the most frequently operated device. The circuit breaker is used to cut off and connect the load circuit, and when the circuit is overloaded, short-circuited, over-temperature, and over / under-voltage, etc., the circuit breaker can automatically disconnect the circuit to prevent the accident from expanding and ensure safe operation.

[0003] The closing and opening operations of the circuit breaker are usually realized by the contact and separation between the moving contact and the static contact. The static contact is fixed in the housing, and the moving contact is arranged on the mechanism seat. The rotation of the mechanism seat can drive the moving contact to approach or move away from the static contact. The existing circuit breaker uses a torsional spring to abut against the moving contact and a compression spring to abut against the mechanism seat. The closing force for the moving contact is provided by the deformation of the torsional spring during closing, and the reset force for the mechanism seat is provided by the recovery of the compression spring during opening. This structure uses more parts, which increases the volume of the circuit breaker and also increases the cost. SUMMARY

[0004] The present application aims at the deficiencies in the prior art, and provides an operating mechanism and a circuit breaker. The operating mechanism only uses one torsional spring to provide the closing force for the moving contact and the reset force for the mechanism seat, thereby reducing the parts, occupying less space, and being low in cost.

[0005] To achieve the above-mentioned purpose, the technical solutions adopted by the embodiments of the present application are as follows:

[0006] In one aspect of the embodiments of the present application, an operating mechanism is configured in a housing. The operating mechanism comprises a moving contact assembly and a torsional spring. The moving contact assembly comprises a mechanism seat and a moving contact arranged on the mechanism seat. The mechanism seat is arranged to rotate in the housing. The torsional spring comprises a torsional spring body, a first torsional arm and a second torsional arm. The torsional spring body is arranged on the moving contact assembly. The axis of the torsional spring body is arranged not to coincide with the rotation axis of the mechanism seat. The first torsional arm abuts against the moving contact assembly to exert a closing force on the moving contact in a closed state. The second torsional arm abuts against the housing to exert a compression force on the housing in the closed state. The reaction force of the closing force and the reaction force of the compression force jointly provide an opening reset force of the mechanism seat.

[0007] Optionally, a torsional spring column is arranged on the mechanism seat. The axis of the torsional spring column is parallel to the rotation axis of the mechanism seat. The torsional spring body is sleeved on the torsional spring column. The first torsional arm abuts against the moving contact.

[0008] Optionally, the movable contact includes a movable contact body and a first boss provided on the movable contact body, the movable contact body is provided with a movable contact point configured to contact the static contact to close the circuit breaker, the first boss and the movable contact point are located on opposite sides of a reference plane parallel to the length direction of the housing, the rotation axis of the movable contact body is located on the reference plane, the torsion spring body is located on a side of the first boss facing the static contact, the first torsion arm abuts against a side of the first boss facing the static contact, and the second torsion arm abuts against a side of the second boss of the housing facing away from the static contact.

[0009] Optionally, the first torsion arm includes an extension and an abutting portion perpendicular to the extension, one end of the extension is connected with the torsion spring body, the opposite end is connected with the abutting portion, and the abutting portion abuts against the first boss.

[0010] Optionally, the torsion spring body is sleeved on a rotating shaft of the movable contact, the rotating shaft has an axis as the rotation axis of the movable contact and the mechanism seat, and the diameter of the rotating shaft is smaller than the inner diameter of the torsion spring body.

[0011] Optionally, a side of the first torsion arm facing away from the rotating shaft abuts against the mechanism seat, and a side of the second torsion arm facing away from the rotating shaft abuts against the housing; or, a side of the first torsion arm facing the rotating shaft abuts against the movable contact, and a side of the second torsion arm facing away from the rotating shaft abuts against the housing.

[0012] In another aspect of the embodiments of the present application, a circuit breaker is provided, including a housing, a static contact provided in the housing, and an operating mechanism according to any one of the above operating mechanisms, the movable contact of the operating mechanism being configured to cooperate with the static contact.

[0013] Optionally, the housing is provided with a second boss having a first abutting surface and a second abutting surface, the second torsion arm of the torsion spring of the operating mechanism abuts against the first abutting surface in the opening state, and the second torsion arm abuts against the second abutting surface in the closing state.

[0014] Optionally, the second boss is provided with a positioning hole, the rotating shaft is provided in the positioning hole, and the mechanism seat and the movable contact of the operating mechanism are sleeved on the rotating shaft.

[0015] Optionally, the housing is further provided with a third boss, a surface of the third boss facing away from the housing abuts against the second torsion arm of the torsion spring of the operating mechanism, and the third boss and the movable contact assembly of the operating mechanism are located on opposite sides of the torsion spring to limit the torsion spring.

[0016] The beneficial effects of the present application include:

[0017] The application provides an operating mechanism configured in a shell, the operating mechanism comprising: a movable contact assembly and a torsion spring, the movable contact assembly comprising a mechanism seat and a movable contact arranged on the mechanism seat, the mechanism seat being arranged to rotate in the shell, the torsion spring comprising a torsion spring body, a first torsion arm and a second torsion arm, the torsion spring body being arranged on the movable contact assembly, an axis of the torsion spring body being arranged not to coincide with a rotation axis of the mechanism seat, the first torsion arm abutting against the movable contact assembly to exert a closing force on the movable contact in a closing state, and the second torsion arm abutting against the shell to exert a pressing force on the shell in the closing state, a reaction force of the closing force and a reaction force of the pressing force jointly providing a tripping reset force of the mechanism seat. Such a structural arrangement reduces parts, occupies a small space and is low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 A structural schematic diagram of a circuit breaker in a closing state is provided for the embodiments of the application.

[0020] Figure 2 A structural schematic diagram of an operating mechanism is provided for the embodiments of the application.

[0021] Figure 3 A partial structural schematic diagram of a circuit breaker in a closing state is provided for the embodiments of the application.

[0022] Figure 4 A partial structural schematic diagram of a circuit breaker in a tripping state is provided for the embodiments of the application.

[0023] Figure 5 A force schematic diagram of an operating mechanism is provided for the embodiments of the application.

[0024] Figure 6 A structural schematic diagram of a torsion spring in an operating mechanism is provided for the embodiments of the application.

[0025] Figure 7 A structural schematic diagram of an operating mechanism is provided for the embodiments of the application.

[0026] Figure 8 A structural schematic diagram of an operating mechanism is provided for the embodiments of the application.

[0027] Figure 9 A partial structural schematic diagram of a shell in a circuit breaker is provided for the embodiments of the application.

[0028] Figure 10 Figure 2 is a partial structural schematic diagram of the circuit breaker in the open state according to an embodiment of the present application;

[0029] Figure 11 Figure 3 is a partial structural schematic diagram of the circuit breaker in the closed state according to an embodiment of the present application.

[0030] Icon: 10 - operating mechanism; 11 - movable contact assembly; 111 - mechanism seat; 1111 - rotation axis of the mechanism seat; 1112 - torsion spring column; 1113 - torsion arm column; 112 - movable contact; 1121 - movable contact body; 1122 - first boss; 1123 - movable contact point; 1124 - rotation axis of the movable contact; 12 - torsion spring; 121 - torsion spring body; 1211 - axis of the torsion spring body; 122 - first torsion arm; 1221 - extension part; 1222 - abutting part; 123 - second torsion arm; 13 - rotating shaft; 20 - housing; 21 - second boss; 211 - first abutting surface; 212 - second abutting surface; 22 - positioning hole; 23 - third boss; 30 - stationary contact; 40 - circuit breaker; F1 - closing force; F2 - closing counterforce; F3 - pressing force; F4 - supporting force; F5 - resultant force; F6 - counterforce; A - reference plane; L - length direction. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. It should be noted that, in the case of no conflict, various features in the embodiments of the present application can be combined with each other, and the combined embodiments are still within the protection scope of the present application.

[0033] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0034] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] The closing and opening operations of the circuit breaker are usually realized by the contact and separation between the moving contact and the static contact, wherein the static contact is fixed in the shell, and the moving contact is arranged on the mechanism seat, and the rotation of the mechanism seat can drive the moving contact to approach or move away from the static contact. The existing circuit breaker uses a torsional spring to abut against the moving contact, and a compression spring to abut against the mechanism seat, and in the closing process, the closing force for the moving contact is provided by the deformation of the torsional spring, and in the opening process, the reset force for the mechanism seat is provided by the recovery of the compression spring. This structure uses more parts, which can increase the volume of the circuit breaker and also increase the cost.

[0037] In order to solve the above technical problems, one aspect of the embodiments of the present application, with reference to Figure 1 and Figure 2 , an operating mechanism 10 is provided, which is configured in a shell 20, and the shell 20 can be the shell 20 of a circuit breaker 40, or the shell 20 of other control devices.

[0038] Specifically, the operating mechanism 10 includes a moving contact assembly 11 and a torsional spring 12. The moving contact assembly 11 includes a mechanism seat 111 and a moving contact 112 arranged on the mechanism seat 111, and the mechanism seat 111 is arranged to rotate in the shell 20. Please refer to Figure 3 and Figure 4When the mechanism seat 111 is driven to rotate along the closing direction, the moving contact 112 is gradually close to the static contact 30, and finally contacts the static contact 30 to realize closing. When the mechanism seat 111 is driven to rotate along the opening direction, the moving contact 112 is gradually away from the static contact 30, and finally separates from the static contact 30 to realize opening.

[0039] Please refer to Figure 2 The torsional spring 12 includes a torsional spring body 121, a first torsional arm 122 and a second torsional arm 123. The torsional spring body 121 is arranged on the moving contact assembly 11, and the axis 1211 of the torsional spring body is arranged not to coincide with the rotation axis 1111 of the mechanism seat, preferably in parallel. The first torsional arm 122 abuts against the moving contact assembly 11 to exert a closing force F1 on the moving contact 112 in the closed state, and the second torsional arm 123 abuts against the housing 20 to exert a pressing force F3 on the housing 20 in the closed state. The reaction force of the closing force F1 and the reaction force of the pressing force F3 jointly provide the opening reset force of the mechanism seat 111.

[0040] It should be noted that the torsional spring body 121 can be arranged on the mechanism seat 111 of the moving contact assembly 11 or on the moving contact 112 of the moving contact assembly 11. The first torsional arm 122 can abut against the mechanism seat 111 or the moving contact 112. When the first torsional arm 122 abuts against the mechanism seat 111, the closing force F1 exerted by the first torsional arm 122 on the mechanism seat 111 is equivalent to the closing force exerted on the moving contact 112, because the moving contact 112 is fixedly connected to the mechanism seat 111.

[0041] Please refer to Figure 5 In the closed state, the first torsional arm 122 exerts a closing force F1 on the moving contact 112, and the moving contact 112 exerts a closing reaction force F2 (i.e. the reaction force of the closing force F1) on the first torsional arm 122. The second torsional arm 123 exerts a pressing force F3 on the housing 20, and the housing 20 exerts a supporting force F4 (i.e. the reaction force of the pressing force F3) on the second torsional arm 123. The resultant force F5 of the closing reaction force F2 and the supporting force F4 is exerted on the torsional spring body 121. Since the axis of the torsional spring body 121 is arranged not to coincide with the rotation axis of the mechanism seat 111, the reaction force F6 of the torsional spring body 121 to the resultant force F5 can provide the opening reset force for the mechanism seat 111, and further provide the opening reset force for the operating mechanism 10.

[0042] Optionally, please refer to Figure 2 The mechanism seat 111 is provided with a torsional spring column 1112, and the axis of the torsional spring column 1112 is parallel to the rotation axis 1111 of the mechanism seat. The torsional spring body 121 is sleeved on the torsional spring column 1112, and the first torsional arm 122 abuts against the moving contact 112.

[0043] The torsion spring body 121 is arranged on the mechanism seat 111, and the torsion spring body 121 is staggered with the position of the movable contact 112, so that the first torsion arm 122 can directly abut against the movable contact 112, and the movable contact 112 is directly provided with stable closing force F1.

[0044] Preferably, the diameter of the torsion spring column 1112 is smaller than the inner diameter of the torsion spring body 121, so that the position of the torsion spring body 121 can be adjusted in the deformation process of the torsion spring 12, and the jamming is avoided.

[0045] Optionally, please refer to Figure 3 The movable contact 112 includes a movable contact body 1121 and a first boss 1122 arranged on the movable contact body 1121, and the movable contact body 1121 is provided with a movable contact point 1123 for contact and closing with the static contact 30. The first boss 1122 and the movable contact point 1123 are located on opposite sides of the reference plane A. The torsion spring body 121 is located on the side of the first boss 1122 facing the static contact 30. The reference plane A is parallel to the length direction L of the shell 20, and the rotation axis of the movable contact body 1121 (i.e. the rotation axis 1124 of the movable contact) is located on the reference plane A. The first torsion arm 122 abuts against the side of the first boss 1122 facing the static contact 30, and the first torsion arm 122 pushes the first boss 1122 away from the static contact 30, so as to provide the movable contact point 1123 on the other side with closing force close to the static contact 30. The second torsion arm 123 abuts against the side of the second boss 21 of the shell 20 away from the static contact 30, so that the second boss 21 provides the second torsion arm 123 with support force F4 away from the static contact 30. The counterforce of the resultant force formed by the closing force F2 and the support force F4 can provide the mechanism seat 111 with opening reset force.

[0046] For example, the first boss 1122 is located on the edge of the movable contact body 1121, so as to avoid the movable contact body 1121 interfering with the first torsion arm 122.

[0047] Optionally, please refer to Figure 2 and Figure 6 The first torsion arm 122 includes an extension part 1221 and an abutment part 1222 perpendicular to the extension part 1221. One end of the extension part 1221 is connected with the torsion spring body 121, and the opposite end is connected with the abutment part 1222. The abutment part 1222 abuts against the first boss 1122.

[0048] The first torsion arm 122 abuts against the first boss 1122 through the abutment part 1222, so as to increase the contact area between the first torsion arm 122 and the first boss 1122, and further stabilize the closing force F1 applied by the first torsion arm 122 to the movable contact 112.

[0049] In the foregoing embodiment, the torsion spring body 121 is sleeved on the mechanism seat 111 of the movable contact assembly 11, and in other embodiments, the torsion spring body 121 can also be sleeved on the movable contact 112 of the movable contact assembly 11, as long as the axis 1211 of the torsion spring body is not coincident with the rotation axis 1111 of the mechanism seat.

[0050] Optionally, referring to Figure 7 , the torsion spring body 121 is sleeved on the rotating shaft 13 of the movable contact 112, the axis of the rotating shaft 13 is the rotation axis of the movable contact 112 and the mechanism seat 111, and the diameter of the rotating shaft 13 is smaller than the inner diameter of the torsion spring body 121.

[0051] The movable contact 112 and the mechanism seat 111 are installed in the housing 20 through the same rotating shaft 13, and the movable contact 112 is relatively fixed with the mechanism seat 111. The torsion spring body 121 is sleeved on the rotating shaft 13. Since the inner diameter of the torsion spring body 121 is greater than the diameter of the rotating shaft 13, after the first torsion arm 122 of the torsion spring 12 abuts against the mechanism seat 111 or the movable contact 112 and the second torsion arm 123 abuts against the housing 20, the axis 1211 of the torsion spring body can automatically form a parallel relationship with the axis of the rotating shaft 13.

[0052] Optionally, the side of the first torsion arm 122 away from the rotating shaft 13 abuts against the mechanism seat 111, and the side of the second torsion arm 123 away from the rotating shaft 13 abuts against the housing 20.

[0053] Further, the mechanism seat 111 is provided with a torsion arm column 1113, the middle part of the first torsion arm 122 abuts against the side wall of the torsion arm column 1113, and the end of the first torsion arm 122 away from the torsion spring body is bent to surround the torsion arm column 1113 to achieve limiting.

[0054] Optionally, referring to Figure 8 , the side of the first torsion arm 122 toward the rotating shaft 13 abuts against the movable contact 112, and the side of the second torsion arm 123 away from the rotating shaft 13 abuts against the housing 20.

[0055] Further, the mechanism seat 111 is provided with a torsion arm column 1113, the middle part of the first torsion arm 122 is bent to surround the torsion arm column 1113 to achieve limiting, and the end of the first torsion arm 122 away from the torsion spring body abuts against the movable contact 112.

[0056] The embodiment also provides a circuit breaker 40, referring to Figure 1 , the circuit breaker 40 comprises a housing 20, an operating mechanism 10 and a stationary contact 30 provided in the housing 20, the operating mechanism 10 being any one of the operating mechanisms 10 described above, and the movable contact 112 of the operating mechanism 10 cooperating with the stationary contact 30.

[0057] The circuit breaker 40 comprises the same structure and advantages as the operating mechanism 10 in the foregoing embodiments. The structure and advantages of the operating mechanism 10 have been described in detail in the foregoing embodiments, which will not be described herein.

[0058] Optionally, referring to Figure 9 , the shell 20 is provided with a second boss 21, and the second boss 21 is provided with a first abutting surface 211 and a second abutting surface 212; in combination with reference to Figure 10 , in the open state, the second torsion arm 123 of the torsion spring 12 of the operating mechanism 10 abuts against the first abutting surface 211; in combination with reference to Figure 11 , in the closed state, the second torsion arm 123 abuts against the second abutting surface 212.

[0059] The relative positions of the contact point of the second torsion arm 123 and the first abutting surface 211 and the contact point of the second torsion arm 123 and the second abutting surface 212 are different. By adjusting the inclination angles of the two abutting surfaces and the included angle therebetween, it can be ensured that the second boss 21 always abuts against the second torsion arm 123 during the opening and closing process, and continuously provides the support force F4 for the second torsion arm 123.

[0060] Optionally, referring to Figure 2 and Figure 9 , the second boss 21 is provided with a positioning hole 22, and the positioning hole 22 is provided with a rotating shaft 13, and the mechanism seat 111 and the movable contact 112 of the operating mechanism 10 are sleeved on the rotating shaft 13, so that the mechanism seat 111 and the movable contact 112 are rotationally arranged in the shell 20.

[0061] Optionally, in combination with reference to Figure 10 , the shell 20 is further provided with a third boss 23, the surface of the third boss 23 away from the shell 20 abuts against the second torsion arm 123 of the torsion spring 12 of the operating mechanism 10, the third boss 23 and the movable contact assembly 11 of the operating mechanism 10 are respectively located on the opposite sides of the torsion spring 12, and the third boss 23 and the movable contact assembly 11 cooperate to clamp and limit the torsion spring 12 therebetween, so as to limit the torsion spring 12.

[0062] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An operating mechanism disposed within a housing (20), characterized in that, The operating mechanism includes a moving contact assembly (11) and a torsion spring (12). The moving contact assembly (11) includes a mechanism seat (111) and a moving contact (112) disposed on the mechanism seat (111). The mechanism seat (111) is rotatably disposed within the housing (20). The torsion spring (12) includes a torsion spring body (121), a first torsion arm (122), and a second torsion arm (123). The torsion spring body (121) is disposed on the moving contact assembly (11), and the axis of the torsion spring body (121) is ( The first torsion arm (122) is not aligned with the rotation axis (1111) of the mechanism base (111). The first torsion arm (122) abuts against the moving contact assembly (11) to apply a closing force (F1) to the moving contact (112) in the closed state. The second torsion arm (123) abuts against the housing (20) to apply a clamping force (F3) to the housing (20) in the closed state. The reaction force of the closing force (F1) and the reaction force of the clamping force (F3) together provide the opening reset force of the mechanism base (111).

2. The operating mechanism as described in claim 1, characterized in that, The mechanism base (111) is provided with a torsion spring column (1112), the axis of the torsion spring column (1112) is parallel to the rotation axis (1111) of the mechanism base (111), the torsion spring body (121) is sleeved on the torsion spring column (1112), and the first torsion arm (122) abuts against the moving contact (112).

3. The operating mechanism as described in claim 2, characterized in that, The moving contact (112) includes a moving contact body (1121) and a first boss (1122) disposed on the moving contact body (1121). The moving contact body (1121) is provided with a moving contact (1123), which is used to contact the stationary contact (30) for closing. The first boss (1122) and the moving contact (1123) are located on opposite sides of a reference plane (A), which is parallel to the housing (20). Along the length direction (L), the rotation axis of the moving contact body (1121) is located on the reference plane (A). The torsion spring body (121) is located on the side of the first boss (1122) facing the stationary contact (30). The first torsion arm (122) abuts against the side of the first boss (1122) facing the stationary contact (30). The second torsion arm (123) abuts against the side of the second boss (21) of the housing (20) away from the stationary contact (30).

4. The operating mechanism as described in claim 3, characterized in that, The first torsion arm (122) includes an extension (1221) and an abutment (1222) perpendicular to the extension (1221). One end of the extension (1221) is connected to the torsion spring body (121), and the other end is connected to the abutment (1222). The abutment (1222) abuts against the first boss (1122).

5. The operating mechanism as described in claim 1, characterized in that, The torsion spring body (121) is sleeved on the rotating shaft (13) of the moving contact (112). The axis of the rotating shaft (13) is the rotation axis of the moving contact (112) and the mechanism seat (111). The diameter of the rotating shaft (13) is smaller than the inner diameter of the torsion spring body (121).

6. The operating mechanism as described in claim 1, characterized in that, The first torsion arm (122) abuts against the mechanism seat (111) on the side away from the rotating shaft (13), and the second torsion arm (123) abuts against the housing (20) on the side away from the rotating shaft (13); or, the first torsion arm (122) abuts against the moving contact (112) on the side facing the rotating shaft (13), and the second torsion arm (123) abuts against the housing (20) on the side away from the rotating shaft (13).

7. A circuit breaker, characterized in that, It includes a housing (20), an operating mechanism as described in any one of claims 1 to 6 disposed within the housing (20), and a stationary contact (30), wherein a moving contact (112) of the operating mechanism cooperates with the stationary contact (30).

8. The circuit breaker as claimed in claim 7, characterized in that, The housing (20) is provided with a second boss (21), and the second boss (21) has a first abutment surface (211) and a second abutment surface (212). In the open state, the second torsion arm (123) of the torsion spring (12) of the operating mechanism (10) abuts against the first abutment surface (211). In the closed state, the second torsion arm (123) abuts against the second abutment surface (212).

9. The circuit breaker as claimed in claim 8, characterized in that, The second boss (21) is provided with a positioning hole (22), and a rotating shaft (13) is provided in the positioning hole (22). The mechanism seat (111) and the moving contact (112) of the operating mechanism are sleeved on the rotating shaft (13).

10. The circuit breaker as claimed in claim 7, characterized in that, The housing (20) is further provided with a third protrusion (23). The surface of the third protrusion (23) facing away from the housing (20) abuts against the second torsion arm (123) of the torsion spring (12) of the operating mechanism. The third protrusion (23) and the moving contact assembly (11) of the operating mechanism are respectively located on opposite sides of the torsion spring (12) to limit the torsion spring (12).

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