Residual current operated circuit breaker

Abstract

The utility model discloses a residual current operated circuit breaker, which comprises a circuit breaker shell and a rotating shaft, and the rotating shaft is rotatably connected with the circuit breaker shell. At least one mounting groove is formed in the rotating shaft, a moving contact and a contact torsion spring are arranged in each mounting groove, and one end of each contact torsion spring abuts against the corresponding moving contact; wherein the mounting groove is provided with an abutting wall and two side walls, and the two side walls are arranged on the two sides of the abutting wall respectively; abutting structures are arranged on the two side walls, and each abutting structure is provided with a first gear and a second gear; the other end of the contact torsion spring abuts against one of the abutting wall, the first gear and the second gear. The deformation quantity of the contact torsion spring when the contact torsion spring abuts against the abutting wall is smaller than the deformation quantity of the contact torsion spring when the contact torsion spring abuts against the first gear, and the deformation quantity of the contact torsion spring when the contact torsion spring abuts against the first gear is smaller than the deformation quantity of the contact torsion spring when the contact torsion spring abuts against the second gear. The pressure adjusting device has the advantage of being adjustable in pressure.

Description

Technical Field

[0001] This application relates to the field of circuit breakers, specifically a residual current operated circuit breaker. Background Technology

[0002] RCCBs are also a relatively mature type of residual current operated circuit breaker. The contact system of this type of circuit breaker is quite similar to that of molded case circuit breakers. Both use a rotating shaft connected to the housing, with multiple spaces on the shaft, and the moving contact of each pole is located in one of these spaces. To ensure the contact pressure (also called intermediate pressure) between the moving and stationary contacts, a contact torsion spring is used as an elastic element. One end of the contact torsion spring abuts against the moving contact, and the other end abuts against the shaft (the wall of the space). For example, the 1P+N residual current operated circuit breaker disclosed in CN204257545U uses this structure.

[0003] Currently, the contact pressure of this type of circuit breaker cannot be adjusted, which means there's a possibility that one of the circuit breaker's contacts might have insufficient pressure. This could be a problem present during manufacturing or it could occur later during product use. Either way, replacement is extremely inconvenient for users.

[0004] Therefore, how to more rationally design a circuit breaker with adjustable medium pressure is of considerable research value. Summary of the Invention

[0005] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and to provide a residual current operated circuit breaker.

[0006] This application provides: a residual current operated circuit breaker, comprising a circuit breaker housing and a rotating shaft, the rotating shaft being rotatably connected to the circuit breaker housing; the rotating shaft is provided with at least one mounting groove, each mounting groove being provided with a moving contact and a contact torsion spring, one end of the contact torsion spring abutting against the moving contact; wherein, the mounting groove has an abutment wall and two side walls, the two side walls being respectively provided on both sides of the abutment wall; the two side walls are provided with abutment structures, the abutment structures having a first position and a second position; the other end of the contact torsion spring abuts against one of the abutment wall, the first position, and the second position; the deformation of the contact torsion spring when abutting against the abutment wall is less than the deformation of the contact torsion spring when abutting against the first position, and the deformation of the contact torsion spring when abutting against the first position is less than the deformation of the contact torsion spring when abutting against the second position.

[0007] In some embodiments of this application, the contact torsion spring has two coils, each coil having a first branch arm and a second branch arm connected to both ends; the two first branch arms are connected and the first branch arms are used to abut against the moving contact; the two second branch arms are used to abut against one of the three: the abutment wall, the first position, and the second position.

[0008] In some embodiments of this application, the abutment structure includes a positioning pin and adjustment grooves formed on both side walls; the adjustment groove includes a first positioning groove, a second positioning groove, and a connecting groove; the connecting groove has an installation port on one side of the rotating shaft; the openings of the first positioning groove and the second positioning groove are both connected to the connecting groove; both ends of the positioning pin are inserted into the connecting groove through the installation port, and slide into the first positioning groove or the second positioning groove through the opening; when the two ends of the positioning pin are in the first positioning groove, they form a first position, and when the two ends of the positioning pin are in the second positioning groove, they form a second position.

[0009] In some embodiments of this application, when both ends of the positioning pin are in the first positioning groove, the second branch arm abuts against the positioning pin, and the second branch arm exerts a force on the positioning pin in the direction of the bottom of the first positioning groove, so as to prevent the positioning pin from disengaging from the first positioning groove.

[0010] In some embodiments of this application, when the two ends of the positioning pin are in the second positioning groove, the second branch arm abuts against the positioning pin, and the second branch arm exerts a force on the positioning pin in the direction of the groove bottom of the second positioning groove, so as to prevent the positioning pin from disengaging from the second positioning groove.

[0011] In some embodiments of this application, the abutment structure includes a first positioning post and a second positioning post disposed on two side walls, both of which are integrally formed with the rotating shaft; the two first positioning posts form a first position, and the two second positioning posts form a second position.

[0012] In some embodiments of this application, the end of the first positioning post away from the connection with the side wall has a first limiting protrusion, and when the second branch arm abuts against the first positioning post, it is located between the first limiting protrusion and the side wall; the end of the second positioning post away from the connection with the side wall has a second limiting protrusion, and when the second branch arm abuts against the second positioning post, it is located between the second limiting protrusion and the side wall.

[0013] In some embodiments of this application, the surface of the first limiting protrusion connected to the first positioning post has a first transition arc surface so that the second branch arm can slide in and abut against the first positioning post; the surface of the second limiting protrusion connected to the second positioning post has a second transition arc surface so that the second branch arm can slide in and abut against the second positioning post.

[0014] In some embodiments of this application, the end of the first limiting protrusion away from the first positioning post has a third transition arc surface, so that the second branch arm can slide into the first limiting protrusion from the outside; the end of the second limiting protrusion away from the second positioning post has a fourth transition arc surface, so that the second branch arm can slide into the second limiting protrusion from the outside.

[0015] In some embodiments of this application, the second branch arm corresponds one-to-one with the side wall; the second branch arm is inclined and tilts from the direction of the coil to the direction of the corresponding side wall, and when the contact torsion spring is installed in the mounting groove, there is compression between the second branch arm and the corresponding side wall.

[0016] In some embodiments of this application, the circuit breaker housing includes a base and a top cover; the base has a semi-groove, the top cover has an abutment rib, one end of the rotating shaft is rotatably disposed in the semi-groove, and the abutment rib restricts the rotating shaft from leaving the semi-groove; it also includes a mechanism bracket, the mechanism bracket is fixed on the base, and the other end of the rotating shaft is rotatably disposed in the positioning hole of the mechanism bracket.

[0017] The advantages of this application compared to the prior art are:

[0018] This application adds a stop structure with two positions. The deformation of the contact torsion spring differs depending on the position; a greater deformation results in greater contact pressure between the moving and stationary contacts. This structure allows for adjustment of contact pressure when insufficient pressure is encountered by shifting to different positions. Compared to existing technologies, this structure offers greater adaptability. Attached Figure Description

[0019] 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.

[0020] Figure 1 An exploded view of a residual current operated circuit breaker according to an embodiment of this application is shown;

[0021] Figure 2 A cross-sectional view of the joint between the rotating shaft and the base and the top cover in an embodiment of this application is shown;

[0022] Figure 3 A schematic diagram of the fit between the rotating shaft and the mechanism support in an embodiment of this application is shown;

[0023] Figure 4 This illustration shows a schematic diagram of the installation of the rotating shaft and the contact torsion spring in an embodiment of this application;

[0024] Figure 5 A schematic diagram of the contact torsion spring in an embodiment of this application is shown;

[0025] Figure 6 A schematic diagram of a first embodiment of the abutment structure in this application is shown;

[0026] Figure 7 A partially enlarged view of the first embodiment of the abutment structure in this application is shown;

[0027] Figure 8 This illustration shows a schematic diagram of the abutting structure in this application embodiment when the contact torsion spring of the first embodiment abuts against the abutting wall;

[0028] Figure 9 This diagram shows a schematic of the abutting structure in an embodiment of this application when the contact torsion spring of the first embodiment abuts against the first position;

[0029] Figure 10 This illustration shows a schematic diagram of the abutting structure in the embodiment of this application when the contact torsion spring of the first embodiment abuts against the second position;

[0030] Figure 11 A schematic diagram of a second embodiment of the abutment structure in this application is shown;

[0031] Figure 12 A partially enlarged view of the second embodiment of the abutment structure in this application is shown;

[0032] Figure 13 This illustration shows a schematic diagram of the abutting structure in this application embodiment when the contact torsion spring of the second embodiment abuts against the abutting wall;

[0033] Figure 14 This diagram shows a contact torsion spring of the second embodiment of the abutment structure abutting against the first position in an embodiment of this application.

[0034] Figure 15 This illustration shows a schematic diagram of the abutment structure in the second embodiment of this application when the contact torsion spring abuts against the second position. Detailed Implementation

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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

[0040] like Figure 1-15 As shown, a residual current operated circuit breaker, also known as an RCCB, is a type of circuit breaker.

[0041] It includes the circuit breaker housing 100, mechanism, residual current trip unit, zero-sequence current transformer, contact structure, etc.

[0042] The circuit breaker housing 100 includes a base 110 and a top cover 120, which are fastened together by a combination of snap-fit ​​and screws.

[0043] Zero-sequence current transformer is used to sample leakage current signals.

[0044] A residual current device (RCD) is used to trip the circuit breaker when a leakage current fault occurs in the line.

[0045] The mechanism is used to control the connection and disconnection of the contact structure. The mechanism is fixed to the base 110 by the mechanism bracket 200.

[0046] The contact structure includes a rotating shaft 300, a moving contact 400, and a stationary contact 500. The stationary contact 500 is fixed inside the base 110. The rotating shaft 300 is rotatably connected to the circuit breaker housing 100. The moving contact 400 is mounted on the rotating shaft 300. The contact and separation of the moving and stationary contacts 500 are achieved by rotating the rotating shaft 300.

[0047] Here, one end of the rotating shaft 300 along its length has a second protrusion 320, which extends into the positioning hole 210 of the mechanism bracket 200 to form a rotatable connection. The other end of the rotating shaft 300 along its length has a first protrusion 310, which extends into the semi-groove 115 of the base 110 to form a rotatable connection. Here, the inner wall of the upper cover 120 forms an abutment rib 125, which is located at the opening of the semi-groove 115, thereby preventing the rotating shaft 300 from disengaging from the semi-groove 115.

[0048] This embodiment is a two-pole circuit breaker, therefore the number of moving contacts 400 and stationary contacts 500 are both two. Of course, in addition, it can also be a three-pole or four-pole circuit breaker, with the corresponding number of moving contacts 400 and stationary contacts 500 being three or four.

[0049] Since the installation method of each moving contact 400 is the same, the following will describe one of them.

[0050] A mounting groove 330 is provided on the rotating shaft 300. One end of the moving contact 400 is in the mounting groove 330, and the other end is outside the rotating shaft 300 (to cooperate with the stationary contact 500).

[0051] Each mounting slot 330 has an abutment wall 330a and two side walls 330b, which are located on both sides of the abutment wall 330a.

[0052] Each moving contact 400 has a contact torsion spring 600 to ensure its contact pressure. One end of the contact torsion spring 600 abuts against the moving contact 400, and the other end abuts against a groove wall (abutment wall 330a) of the mounting groove 330, or against abutment structure. Here, the contact torsion spring 600 has two coil portions 600a, each coil portion 600a having a first branch arm 600b and a second branch arm 600c connected to both ends. The two first branch arms 600b are connected and are used to abut against the moving contact 400. The two second branch arms 600c are used to abut against the abutment wall 330a, or against abutment structure. This contact torsion spring 600 structure is relatively easy to form, and the force exerted on the contact during deformation is also relatively uniform.

[0053] Here, the abutment structure has a first position S1 and a second position S2. When the contact torsion spring 600 abuts against the abutment wall 330a, the deformation of the contact torsion spring 600 is F1; when the contact torsion spring 600 abuts against the first position S1, the deformation of the contact torsion spring 600 is F2; ​​when the contact torsion spring 600 abuts against the second position S2, the deformation of the contact torsion spring 600 is F3; F3>F2>F1.

[0054] With this design, the deformation of the contact torsion spring 600 varies depending on the engagement position. A greater deformation results in greater contact pressure between the moving contact 400 and the stationary contact 500. This structure allows for adjustment of contact pressure when it is insufficient by engaging different engagement positions. Compared to existing technologies, this structure offers greater adaptability.

[0055] There are many ways to implement this type of abutment structure. Here are two examples:

[0056] like Figure 6-10 As shown, this serves as a support structure. The support structure consists of positioning posts formed on the side walls 330b. Here, both side walls 330b are provided with first positioning posts 3301 and second positioning posts 3302, both of which are integrally formed with the rotating shaft 300. The two first positioning posts 3301 form the first position S1, and the two second positioning posts 3302 form the second position S2. The distance between the first positioning post 3301 and the support wall 330a is less than the distance between the second positioning post 3302 and the support wall 330a. Thus, when the second branch arm 600c abuts against the second positioning post 3302, the deformation of the contact torsion spring 600 is greater than when it abuts against the first positioning post 3301.

[0057] This type of positioning column is very convenient to form and easy to adjust; you only need to move the second branch arm 600c.

[0058] The first positioning post 3301 has a first limiting protrusion 3303 at its end away from the connection with the side wall 330b. Thus, when the second branch arm 600c abuts against the first positioning post 3301, the second branch arm 600c is positioned between the first limiting protrusion 3303 and the side wall 330b. The second positioning post 3302 has a second limiting protrusion 3304 at its end away from the connection with the side wall 330b. Thus, when the second branch arm 600c abuts against the second positioning post 3302, the second branch arm 600c is positioned between the second limiting protrusion 3304 and the side wall 330b. This design of the first limiting protrusion 3303 and the second limiting protrusion 3304 makes the contact of the second branch arm 600c more stable, ensuring the stability of the contact.

[0059] The surface of the first limiting protrusion 3303 connected to the first positioning post 3301 has a first transition arc surface 3305, which allows the second branch arm 600c to easily slide into the first positioning post 3301 along the first transition arc surface 3305 during movement. The surface of the second limiting protrusion 3304 connected to the second positioning post 3302 has a second transition arc surface 3306, which allows the second branch arm 600c to easily slide into the second positioning post 3302 along the second transition arc surface 3306 during movement. This transition arc surface design makes the movement (adjustment) of the second branch arm 600c smoother.

[0060] The first limiting protrusion 3303 has a third transition arc surface 3307 at the end away from the first positioning post 3301. This makes it easy for the second branch arm 600c to slide from the outside along the third transition arc surface 3307 into the first limiting protrusion 3303 when it moves, until it abuts against the first positioning post 3301.

[0061] The second limiting protrusion 3304 has a fourth transition arc surface 3308 at the end away from the second positioning post 3302. This makes it easy for the second branch arm 600c to slide from the outside along the fourth transition arc surface 3308 into the second limiting protrusion 3304 when it moves, until it abuts against the second positioning post 3302.

[0062] Both the design of the third transition arc surface 3307 and the fourth transition arc surface 3308 make the second branch arm 600c move (adjust) more smoothly.

[0063] like Figures 11-15 As shown, in another embodiment, the abutment structure includes a positioning pin 3310 and an adjustment groove, which is provided on both side walls 330b. Each adjustment groove includes a first positioning groove 3311, a second positioning groove 3312, and a connecting groove 3313. The distances of the first positioning groove 3311 and the second positioning groove 3312 from the abutment wall 330a are different.

[0064] The connecting groove 3313 is located on one side of the rotating shaft 300 and has an installation port 3313a. The openings of the first positioning groove 3311 and the second positioning groove 3312 are both connected to the connecting groove 3313. Since the first positioning groove 3311 and the second positioning groove 3312 are semi-closed, when the two ends of the positioning pin 3310 are inserted into the connecting groove 3313 through the installation port 3313a, they can slide into the first positioning groove 3311 (sliding into the first positioning groove 3311 through its opening) or the second positioning groove 3312 (sliding into the second positioning groove 3312 through its opening). When the two ends of the positioning pin 3310 are in the first positioning groove 3311, they form the first position S1; when the two ends of the positioning pin 3310 are in the second positioning groove 3312, they form the second position S2.

[0065] In this structure, the second branch arm 600c abuts against the positioning pin 3310. When the positioning pin 3310 is in different positioning slots, it represents different gear positions. This structure is also very convenient to form and very easy to adjust.

[0066] Here, when both ends of the positioning pin 3310 are in the first positioning groove 3311, the second branch arm 600c abuts against the positioning pin 3310, and the second branch arm 600c applies a force F4 to the positioning pin 3310 in the direction of the bottom of the first positioning groove 3311, so as to restrict the positioning pin 3310 from leaving the first positioning groove 3311.

[0067] Here, when both ends of the positioning pin 3310 are in the second positioning groove 3312, the second branch arm 600c abuts against the positioning pin 3310, and the second branch arm 600c applies a force F4 to the positioning pin 3310 in the direction of the bottom of the second positioning groove 3312, so as to restrict the positioning pin 3310 from leaving the second positioning groove 3312.

[0068] In this way, the direction of the force exerted by the second branch arm 600c on the positioning pin 3310 will ensure that the positioning pin 3310 is more stably positioned in the corresponding positioning groove.

[0069] To further improve the reliability between the contact torsion spring 600 and the rotating shaft 300, the second branch arm 600c is inclined, tilting from the direction of the coil towards the direction of its corresponding side wall 330b. This ensures that when the contact torsion spring 600 is installed in the mounting groove 330, there is compression between the second branch arm 600c and the corresponding side wall 330b. The reaction force generated by this compression is not significant, thus ensuring the installation stability of the contact torsion spring 600.

[0070] 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.

[0071] 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. A residual current operated circuit breaker, comprising a circuit breaker housing and a rotating shaft, the rotating shaft being rotatably connected to the circuit breaker housing; the rotating shaft being provided with at least one mounting groove, each mounting groove being provided with a moving contact and a contact torsion spring, one end of the contact torsion spring abutting against the moving contact; characterized in that: The mounting slot has an abutment wall and two side walls, which are located on both sides of the abutment wall. The two side walls are provided with abutment structures, which have a first position and a second position. The other end of the contact torsion spring abuts against one of the three: the abutment wall, the first position, or the second position. The deformation of the contact torsion spring when it abuts against the abutment wall is less than the deformation of the contact torsion spring when it abuts against the first position, and the deformation of the contact torsion spring when it abuts against the first position is less than the deformation of the contact torsion spring when it abuts against the second position.

2. A residual current operated circuit breaker according to claim 1, characterized in that: The contact torsion spring has two coils, each coil having a first branch arm and a second branch arm connected to both ends; the two first branch arms are connected and are used to abut against the moving contact; the two second branch arms are used to abut against one of the three: the abutment wall, the first position, and the second position.

3. A residual current operated circuit breaker according to claim 2, characterized in that: The abutment structure includes a positioning pin and adjustment grooves formed on two side walls; the adjustment grooves include a first positioning groove, a second positioning groove, and a connecting groove; the connecting groove is located on one side of the rotating shaft and has an installation port; The openings of the first positioning groove and the second positioning groove are both connected to the connecting groove; the two ends of the positioning pin are inserted into the connecting groove through the mounting port, and slide into the first positioning groove or the second positioning groove through the opening; the two ends of the positioning pin form the first position when they are in the first positioning groove, and the two ends of the positioning pin form the second position when they are in the second positioning groove.

4. A residual current operated circuit breaker according to claim 3, characterized in that: When both ends of the positioning pin are in the first positioning groove, the second branch arm abuts against the positioning pin, and the second branch arm exerts a force on the positioning pin in the direction of the bottom of the first positioning groove, so as to prevent the positioning pin from leaving the first positioning groove. Or / and, when the two ends of the positioning pin are in the second positioning groove, the second branch arm abuts against the positioning pin, and the second branch arm exerts a force on the positioning pin in the direction of the groove bottom of the second positioning groove, so as to prevent the positioning pin from leaving the second positioning groove.

5. A residual current operated circuit breaker according to claim 2, characterized in that: The abutment structure includes a first positioning post and a second positioning post disposed on two side walls. Both the first positioning post and the second positioning post are integrally formed with the rotating shaft. The two first positioning posts form a first gear position, and the two second positioning posts form a second gear position.

6. A residual current operated circuit breaker according to claim 5, characterized in that: The first positioning post has a first limiting protrusion at the end away from the connection with the side wall. When the second branch arm abuts against the first positioning post, it is located between the first limiting protrusion and the side wall. The second positioning post has a second limiting protrusion at the end away from the connection with the side wall. When the second branch arm abuts against the second positioning post, it is located between the second limiting protrusion and the side wall.

7. A residual current operated circuit breaker according to claim 6, characterized in that: The surface of the first limiting protrusion connected to the first positioning post has a first transition arc surface, so that the second branch arm can slide in and abut against the first positioning post; the surface of the second limiting protrusion connected to the second positioning post has a second transition arc surface, so that the second branch arm can slide in and abut against the second positioning post.

8. A residual current operated circuit breaker according to claim 6, characterized in that: The end of the first limiting protrusion away from the first positioning post has a third transition arc surface, so that the second branch arm can slide into the first limiting protrusion from the outside; the end of the second limiting protrusion away from the second positioning post has a fourth transition arc surface, so that the second branch arm can slide into the second limiting protrusion from the outside.

9. A residual current operated circuit breaker according to claim 2, characterized in that: The second branch arm corresponds to the side wall one by one; the second branch arm is inclined and is inclined from the direction of the coil to the direction of the corresponding side wall. When the contact torsion spring is installed in the mounting groove, there is compression between the second branch arm and the corresponding side wall.

10. A residual current operated circuit breaker according to claim 1, characterized in that: The circuit breaker housing includes a base and a top cover; the base has a semi-groove, the top cover has a retaining rib, one end of the rotating shaft is rotatably disposed in the semi-groove, and the retaining rib restricts the rotating shaft from leaving the semi-groove; it also includes a mechanism bracket, which is fixed on the base, and the other end of the rotating shaft is rotatably disposed in the positioning hole of the mechanism bracket.

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