A miniature residual current circuit breaker

Abstract

The application discloses a small leakage circuit breaker, wherein a breaker housing is sequentially divided into a first terminal area, an L pole structure area, a concentration area and a second terminal area along a length direction; the concentration area contains an N pole structure and a leakage component; the L pole structure area is sequentially divided into three L pole cavities along a width direction, and the three L pole cavities contain three L pole structures respectively, wherein one L pole structure located at a width direction side is a first L pole structure, and the N pole structure is located at one side of the first L pole structure along the length direction; the N pole structure comprises an N pole movable contact, an N pole static contact and a linkage member which are rotationally arranged; one end of the linkage member is connected with the N pole movable contact, and the other end of the linkage member is connected with an L pole operating mechanism of the first L pole structure to realize that the first L pole structure drives the N pole movable contact to move; the application has the characteristics of redividing an internal space of the breaker.

Description

Technical Field

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

[0002] RCBO is a type of miniature residual current circuit breaker. Currently, these circuit breakers are available in 13P+N and 3P+N configurations. In the 3P+N structure, if the N-pole tripping structure (including the N-pole moving and stationary contacts) is used, it typically consists of three L-pole structures and one N-pole structure arranged sequentially along the width. As shown in CN110534379B, the circuit breaker housing forms four spaces arranged along the width direction: three L-pole cavities and one N-pole cavity. The L-pole structures are located within the L-pole cavities, and the N-pole structures are located within the N-pole cavities. The L-pole structure includes the L-pole housing and, within the L-pole housing, the L-pole operating mechanism, L-pole moving and stationary contacts, instantaneous trip unit, bimetallic strip, etc. The N-pole cavity contains the N-pole structure, residual current trip unit, residual current circuit board, etc. The zero-sequence current transformer is located at the connection point between the L-pole and N-pole cavities, allowing the L-pole and N-pole main circuit conductors to pass through the center hole of the zero-sequence current transformer.

[0003] However, the above structure is clearly difficult to apply in situations where width is limited. Therefore, how to restructure the internal layout of this N-pole disconnectable 3P+N circuit breaker to minimize its width is a problem worth considering. Summary of the Invention

[0004] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and to provide a miniature residual current circuit breaker.

[0005] This application provides: a miniature residual current circuit breaker, comprising a circuit breaker housing, an N-pole structure, a residual current component, and three L-pole structures; wherein...

[0006] The circuit breaker housing is divided along its length into the first terminal area, the L-pole structure area, the concentration area, and the second terminal area.

[0007] The first terminal region is divided into three first terminal cavities along the width direction, each accommodating a first terminal of a three L-pole structure.

[0008] The central area accommodates the N-pole structure and leakage current components;

[0009] The second terminal region is divided into three second terminal cavities and an N-terminal cavity along the width direction, which respectively accommodate the second terminal of the L-pole structure and the N-terminal of the N-pole structure;

[0010] The L-pole structure region is divided into three L-pole chambers along the width direction, each accommodating one of the three L-pole structures. One of the L-pole structures located on the side of the width direction is the first L-pole structure, and the N-pole structure is located on one side of the first L-pole structure in the length direction.

[0011] The N-pole structure includes a rotating N-pole moving contact, an N-pole stationary contact, and a sliding linkage; one end of the linkage is connected to the N-pole moving contact, and the other end of the linkage is linked to the L-pole operating mechanism of the first L-pole structure to realize the first L-pole structure driving the N-pole moving contact to move.

[0012] In some embodiments of this application, the centralized area includes an N-pole chamber, a trip unit chamber, and an assembly chamber. The assembly chamber includes a first cavity and a second cavity that are connected. In the width direction, the trip unit chamber is located between the N-pole chamber and the first cavity, and the N-pole chamber is separated from the trip unit chamber. In the height direction, the second cavity is located below the common area of ​​the first cavity and the trip unit chamber, and a portion of the second cavity is located on one side of the N-pole chamber in the length direction. In the length direction, the N-pole chamber is located between the L-pole chamber of the first L-pole structure and a portion of the second cavity. The leakage current assembly includes a circuit board assembly, a leakage current trip unit, and a zero-sequence current transformer. The leakage current trip unit is disposed in the trip unit chamber, the circuit board assembly is disposed in the first cavity and / or the second cavity, and the zero-sequence current transformer is disposed in the second cavity.

[0013] In some embodiments of this application, the circuit breaker housing includes a first housing, a second housing, a third housing, a fourth housing, a first sub-housing, and a second sub-housing; the concentrated area is formed by the first housing, the second housing, the third housing, the fourth housing, the first sub-housing, and the second sub-housing; on one side of the concentrated area along its length, the first housing, the second housing, the third housing, and the fourth housing are arranged sequentially along their width, and a first terminal cavity and an L-pole cavity are formed between each pair of housings; on the other side of the concentrated area along its length, the first housing, the first sub-housing, the second housing, the second sub-housing, and the fourth housing are arranged along their width, and are sequentially spliced ​​together to form an N-pole sub-housing and three second terminal cavities; the N-pole cavity is formed by a portion of the first housing and the first sub-housing, the trip unit cavity is formed by the second housing and the first sub-housing, and the N-pole cavity and the trip unit cavity are separated by the first sub-housing.

[0014] In some embodiments of this application, each L-pole structure includes an L-pole moving contact, an L-pole stationary contact, and an L-pole operating mechanism. The L-pole operating mechanism includes a rotatably configured handle, a connecting rod, a rotatably configured contact support, and a latch rotatably configured on the contact support. The L-pole moving contact is on the contact support and moves with the contact support. The three L-pole operating mechanisms are linked. When the L-pole operating mechanism is in the closed state, the latch is locked, and when the latch is unlocked by external force, the L-pole operating mechanism performs a tripping operation. One end of the linkage is connected to the contact support of the first L-pole structure, and the other end is connected to the N-pole moving contact. The N-pole moving contact includes an N-pole moving contact point. The part of the N-pole moving contact connected to the linkage and the N-pole moving contact point are respectively located on both sides of the rotation center of the N-pole moving contact. Regardless of whether the L-pole operating mechanism performs a closing operation or a tripping operation, the rotation direction of the N-pole moving contact is always opposite to the rotation direction of the L-pole moving contact.

[0015] In some embodiments of this application, each L-pole structure includes a first conductive element and a second conductive elastic element; it also includes a second connector and a first connector disposed on the circuit board assembly. The three first conductive elements are connected to the second connector via a first lead, and the N-pole stationary contact is connected to the second connector via a power-taking lead. The first connector and the second connector cooperate to realize the electrical connection between the first conductive elements, the N-pole stationary contact and the circuit board assembly. Each second conductive elastic element has an extension end extending toward the corresponding first conductive element. The extension end has a first position in contact with the first conductive element and a second position separated from the first conductive element. The extension end is driven by the L-pole operating mechanism to change position. When the L-pole operating mechanism is in the closed state, the extension end is in the first position; when the L-pole operating mechanism is in the open state, the extension end is in the second position. At this time, the power supply between the circuit board assembly and the L-pole moving contact is cut off.

[0016] In some embodiments of this application, a test structure is also included, which includes a test button, a test moving spring, and a test static conductive element; the first conductive element of the first L-pole structure and the test static conductive element are the same component; the first end of the test moving spring is connected to the second connector through a second lead, and the second end of the test moving spring and the test static conductive element are normally open; the second end of the test moving spring is located at the lower end of the test button, and when the test button moves under the action of an external force, it drives the second end of the test moving spring to contact the test static conductive element.

[0017] In some embodiments of this application, the test button is disposed in the L-pole chamber where the first L-pole structure is located; the test moving spring is disposed in the L-pole chamber adjacent to the first L-pole structure via a mounting bracket, and the second end of the test moving spring is inserted into the L-pole chamber where the first L-pole structure is located to cooperate with the test button.

[0018] In some embodiments of this application, the L-pole structure further includes a double metal plate, and the L-pole operating mechanism further includes a pull rod. One end of the pull rod is connected to a latch, and the other end of the pull rod is a tripping part located on one side of the double metal plate. When the double metal plate is bent, it contacts the tripping part, causing the pull rod to move and causing the L-pole operating mechanism to trip. It also includes a rotatably mounted tripping rod. In the length direction, the tripping rod is located between the residual current device (RCD) and the pull rod of the first L-pole structure. The tripping rod includes a trigger arm and a tripping arm. The trigger arm is used to cooperate with the actuation part of the RCD, and the tripping arm is used to cooperate with the tripping part. When the RCD is actuated, it drives the trigger arm to move, causing the tripping rod to rotate, which in turn causes the tripping arm to drive the pull rod to move, causing the L-pole operating mechanism to trip.

[0019] In some embodiments of this application, the structure in which the L-pole operating mechanism is connected to the linkage is a hole-shaft mating structure.

[0020] In some embodiments of this application, the connection between the linkage and the N-pole moving contact is a hole-shaft mating structure.

[0021] In some embodiments of this application, in the length direction, the straight-line distance from the rotation center of the handle to the rotation center of the L-pole moving contact is less than the straight-line distance from the rotation center of the L-pole moving contact to the rotation center of the N-pole moving contact.

[0022] In some embodiments of this application, in the height direction, the straight-line distance from the rotation center of the handle to the rotation center of the L-pole moving contact is less than the straight-line distance from the rotation center of the L-pole moving contact to the rotation center of the N-pole moving contact.

[0023] In some embodiments of this application, an N-pole contact spring is connected between the N-pole moving contact and the circuit breaker housing, and the N-pole contact spring provides contact pressure for the N-pole moving contact.

[0024] In some embodiments of this application, an N-pole rotating post is also provided on the circuit breaker housing. The N-pole moving contact has an oblong hole, the size of which is larger than the diameter of the N-pole rotating post. The oblong hole is fitted onto the N-pole rotating post to form a rotating configuration of the N-pole moving contact, and the oblong hole and the N-pole rotating post slide relative to each other during the rotation of the N-pole moving contact.

[0025] In some embodiments of this application, the circuit breaker housing also includes a limiting protrusion, which is disposed on the side of the N-pole moving contact to limit the maximum movement distance of the N-pole moving contact.

[0026] In some embodiments of this application, the arc-leading angle of the N-pole moving contact and the arc-leading angle of the N-pole stationary contact are also included, with the arc-leading angle of the N-pole stationary contact fixed to or integral with the N-pole stationary contact.

[0027] The advantages of this application compared to the prior art are:

[0028] First, the 3P+N structure of this application rearranges the internal space of the circuit breaker housing, placing the N-pole structure and leakage current device in all concentrated areas (the concentrated areas are located on one side of the L-pole structure area along the length direction). Compared to the prior art where the N-pole structure and leakage current device are both located on one side of the L-pole structure along the width direction, this structure utilizes the space along the length direction of the circuit breaker, thereby reducing the space occupied in the width direction and allowing for a reduction in the width dimension of the circuit breaker.

[0029] Secondly, the N-pole openable structure of this application uses a linkage rod to form a linkage with the operating mechanism of the first L-pole structure, so that the first L-pole operating mechanism can simultaneously drive the first L-pole moving contact and the N-pole moving contact to move, which is different from the N-pole openable structure in the prior art (the N-pole openable structure in the prior art is assembled on one side of the width direction of a certain L-pole and does not use a sliding linkage to achieve transmission). Attached Figure Description

[0030] 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.

[0031] Figure 1 This paper shows a schematic diagram of the internal region division along the length direction of a miniature residual current circuit breaker according to an embodiment of this application;

[0032] Figure 2 This paper shows a schematic diagram of the internal region division along the length and width directions of the miniature residual current circuit breaker according to an embodiment of this application;

[0033] Figure 3 A perspective view of a miniature residual current circuit breaker according to an embodiment of this application is shown;

[0034] Figure 4 This diagram shows a miniature residual current circuit breaker according to an embodiment of the present application after the circuit breaker housing has been removed.

[0035] Figure 5 This diagram shows a miniature residual current circuit breaker according to an embodiment of the present application after the first housing has been removed;

[0036] Figure 6 A cross-sectional view of a concentrated area in a miniature residual current circuit breaker according to an embodiment of this application is shown;

[0037] Figure 7 This paper shows a schematic diagram of the first L-pole structure and the N-pole structure in a miniature residual current circuit breaker according to an embodiment of this application;

[0038] Figure 8This paper shows a schematic diagram of any L-pole mechanism (when disconnected) and the PCB power supply structure in a miniature residual current circuit breaker according to an embodiment of this application.

[0039] Figure 9 This paper shows a schematic diagram of any L-pole mechanism (when closed) and the PCB power supply structure in a miniature residual current circuit breaker according to an embodiment of this application.

[0040] Figure 10 This diagram shows a schematic of the first L-pole structure and the N-pole structure being closed in a miniature residual current circuit breaker according to an embodiment of this application.

[0041] Figure 11 This diagram illustrates the opening of the first L-pole structure and the N-pole structure in the miniature residual current circuit breaker according to an embodiment of this application.

[0042] Figure 12 This paper shows a schematic diagram of the residual current trip unit and the first L pole structure in a miniature residual current circuit breaker according to an embodiment of this application;

[0043] Figure 13 A schematic diagram of the bimetallic strip, trip lever, and L-pole operating mechanism in a miniature residual current circuit breaker according to an embodiment of this application is shown.

[0044] Figure 14 This paper shows a schematic diagram of the interaction between the linkage, the N-pole structure, and the L-pole operating mechanism in a miniature residual current circuit breaker according to an embodiment of this application.

[0045] Figure 15 A schematic diagram showing the first sub-casing separating the N-pole chamber and the trip unit chamber in a miniature residual current circuit breaker according to an embodiment of this application is shown;

[0046] Figure 16 A schematic diagram is shown of a miniature residual current circuit breaker according to an embodiment of this application, in which the second housing and the first sub-housing form a trip unit chamber;

[0047] Figure 17 A schematic diagram of the test structure in the miniature residual current circuit breaker according to an embodiment of this application is shown;

[0048] Figure 18 A schematic diagram of the mounting bracket in the miniature residual current circuit breaker according to an embodiment of this application is shown;

[0049] Figure 19 A schematic diagram of the mounting bracket and test structure in the miniature residual current circuit breaker according to an embodiment of this application is shown;

[0050] Figure 20 A schematic diagram of the second housing in a miniature residual current circuit breaker according to an embodiment of this application is shown;

[0051] Figure 21 A partial cross-sectional view of the test structure in a miniature residual current circuit breaker according to an embodiment of this application is shown. Detailed Implementation

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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

[0057] like Figure 1-21 As shown in the figure, a small residual current circuit breaker is a 3P+N circuit breaker, which includes a circuit breaker housing 300, three L-pole structures 100, an N-pole structure 200, and a residual current component.

[0058] like Figure 4 As shown, the three L-pole structures 100 are arranged sequentially along the width direction D, and the L-pole structure 100 located on the outermost side is the first L-pole structure 100a.

[0059] like Figures 7-9 As shown, each L-pole structure 100 includes an L-pole operating mechanism 110, an L-pole moving contact 120, an L-pole stationary contact 130, a bimetallic strip 140, and an instantaneous trip unit 150.

[0060] like Figures 8-9 As shown, the L-pole operating mechanism 110 comprises a four-bar linkage consisting of a rotatable handle 111, a connecting rod connected to the handle 111 and moving with the handle 111, a latch 112, a rotatable contact support 113, and a contact spring providing contact pressure to the L-pole moving contact 120. Here, when the L-pole operating mechanism 110 is in the closed state (the L-pole moving contact 120 is in contact with the L-pole stationary contact 130), the latch 112 is locked. When the latch 112 is unlocked by external force, the L-pole operating mechanism 110 will perform a tripping operation. The working principle of this four-bar linkage is common knowledge in the field and will not be elaborated here.

[0061] There are many ways that can cause the latch 112 to unlock. It could be caused by the instantaneous trip unit 150 being activated (when there is a short circuit in the line), by the bending of the double metal 140 (when there is an overload in the line), by the activation of the leakage trip unit 400 (when there is a leakage in the line), or by a person performing a tripping operation on the handle 111.

[0062] The instantaneous trip unit 150 and Shuangjin 140 are used to perform short-circuit protection and overload protection, respectively. The specific implementation principle is common knowledge and will not be elaborated here.

[0063] Here, the three L-pole operating mechanisms 110 are linked, specifically by the handle 111 being sleeved together, so that the opening and closing of the three L-pole operating mechanisms 110 are synchronized.

[0064] The L-pole moving contact 120 is rotatably mounted on the contact support 113 and rotates around its rotation center P1. The rotation centers of the L-pole moving contact 120 and the contact support 113 are the same, although they can be different. Driven by the L-pole operating mechanism 110, the L-pole moving contact 120 can rotate in one direction to contact the L-pole stationary contact 130, completing the closing action. Conversely, the L-pole operating mechanism 110 can also drive the L-pole moving contact 120 to rotate in the opposite direction away from the L-pole stationary contact 130, completing the opening action.

[0065] like Figure 4 As shown, each L-pole structure 100 is connected to the circuit to be protected via a pair of terminals, specifically the first terminal 160 and the second terminal 170. The first terminal 160 is electrically connected to the L-pole moving contact 120. Specifically, the first terminal 160 is soldered to the bimetallic strip 140 via a flexible wire (this flexible wire also passes through the center hole of the zero-sequence current transformer 420, thus completing the zero-sequence current transformer 420 being fitted onto the L-pole main line conductor). The bimetallic strip 140 is then soldered to the L-pole moving contact 120 via a flexible connection. The second terminal 170 is electrically connected to the L-pole stationary contact 130. Specifically, the second terminal 170 is soldered to the coil of the instantaneous trip unit 150, and the coil is soldered to the L-pole stationary contact 130. With one of the first terminals 160 and the second terminal 170 connected to the load in the circuit to be protected, and the other connected to the power supply in the circuit to be protected, the L-pole structure 100 can control and protect the circuit to be protected.

[0066] like Figure 4 , Figure 10 as well as Figure 11 As shown, the N-pole structure 200 includes an N-pole moving contact 210, an N-pole stationary contact 220, and a linkage 230. The N-pole moving contact 210 is rotatably mounted relative to the circuit breaker housing 300. The linkage 230 is slidably mounted, and one end of the linkage 230 is linked to the L-pole operating mechanism 110 of the first L-pole structure 100a. In this way, both the N-pole moving contact 210 and the moving contact of the first L-pole structure 100a can complete the closing operation under the drive of the L-pole operating mechanism 110 of the first L-pole structure 100a, and conversely, they can both complete the opening operation under its action. This N-pole openable structure uses a linkage rod to link with the operating mechanism of the first L-pole structure 100a, so that the first L-pole operating mechanism 110 can simultaneously drive the first L-pole moving contact 120 and the N-pole moving contact 210 to move. This is different from the existing N-pole openable structure (in the existing technology, the N-pole openable structure is assembled on one side of the width direction D of a certain L-pole, and does not use a sliding linkage 230 to achieve transmission).

[0067] like Figure 4As shown, the N-pole structure 200 is connected to the circuit to be protected via the N-pole terminal 240 and the connecting wire 250. The N-pole terminal 240 and the N-pole moving contact 210 are connected via a flexible wire (this flexible wire also passes through the center hole of the zero-sequence current transformer 420, thus completing the zero-sequence current transformer 420 being sleeved on the N-pole main line conductor). One end of the connecting wire 250 is soldered to the N-pole stationary contact 220, and the other end extends out of the circuit breaker housing 300. The extended part of the connecting wire 250 is connected to the load in the circuit to be protected on one side and to the power supply in the circuit to be protected on the other side, enabling the N-pole structure 200 to control and protect the circuit to be protected.

[0068] like Figure 4 , Figure 5 As shown, the leakage current assembly includes a leakage current trip unit 400, a circuit board assembly 410, and a zero-sequence current transformer 420. The circuit board assembly 410 internally houses both a leakage current protection circuit and a test circuit. The zero-sequence current transformer 420 is mounted on all main conductors (including the L and N poles). The zero-sequence current transformer 420 serves as the sampling element for the leakage current protection circuit, while the leakage current trip unit 400 serves as the actuating element. When the sampling element detects a leakage current signal, the circuit board assembly 410 controls the leakage current trip unit 400 to actuate, thus tripping the leakage current (the specific mechanical structure will be described in detail below). The test circuit can generate a simulated leakage current under user pressure (the specific mechanical structure will be described in detail below) for leakage current testing. Both the leakage current protection circuit and the test circuit are well-known in terms of their circuit structure and will not be elaborated upon here.

[0069] The circuit breaker housing 300 is composed of multiple housings, with cavities inside designed to accommodate the aforementioned components.

[0070] like Figures 1-2 As shown, the circuit breaker housing 300 is divided into a first terminal area S1, an L-pole structure area S2, a concentrated area S3, and a second terminal area S4 along the length direction L.

[0071] like Figures 1-2 As shown, the specific structure of each region is divided as follows:

[0072] The first terminal region S1 is divided into three first terminal cavities S10 along the width direction D, which respectively accommodate the first terminals 160 of the three L-pole structures 100.

[0073] The L-pole structure region S2 is divided into three L-pole chambers S20 along the width direction D, each accommodating one L-pole structure 100.

[0074] The second terminal region S4 is divided into three second terminal cavities S40 and an N-terminal cavity S50 along the width direction D, respectively accommodating the second terminal 170 of the L-terminal structure 100 and the N-terminal 240 of the N-terminal structure 200. Here, the connecting wire 250 passes through the circuit breaker housing 300 below the N-terminal 240. In the height direction H, the circuit breaker housing 300 has a through hole S60 below the N-terminal cavity S50, through which the connecting wire 250 passes.

[0075] like Figures 5-6 As shown, the centralized area S3 is used to accommodate the N-pole structure 200, the zero-sequence current transformer 420, the leakage current trip unit 400, and the circuit board assembly 410.

[0076] The 3P+N spatial arrangement of this application allows the N-pole structure 200 and the leakage current device to be located in all concentrated areas S3 (the concentrated area S3 is located on one side of the L-pole structure area S2 in the length direction L). Compared to the prior art where the N-pole structure 200 and the leakage current device are all located on one side of the L-pole structure 100 in the width direction D, this result utilizes the space in the length direction L of the circuit breaker, thereby reducing the space occupied in the width direction D and allowing for a reduction in the width dimension of the circuit breaker.

[0077] like Figure 2 as well as Figure 6 As shown, the centralized region S3 is divided into the N-pole chamber S30, the trip unit chamber S31, and the component chamber S32. The component chamber S32 includes a first cavity S321 and a second cavity S322 that are connected to each other.

[0078] The specific distribution of these chambers is as follows:

[0079] In the width direction D, the trip unit chamber S31 is located between the N-pole chamber S30 and the first cavity S321, and the N-pole chamber S30 is separated from the trip unit chamber S31.

[0080] In the height direction H, the second cavity S322 is located below the first cavity S321 and the trip unit chamber S31.

[0081] like Figure 5 As shown, in the length direction L, a portion of the second cavity S322 is located between the N-pole chamber S30 and the second terminal region S4. That is, the N-pole chamber S30 is located between the L-pole chamber S20 of the first L-pole structure 100a and a portion of the second cavity S322.

[0082] The circuit board assembly 410 is distributed in the first cavity S321 and the second cavity S322, the leakage current trip unit 400 is disposed in the trip unit chamber S31, and the zero sequence current transformer 420 is disposed in the second cavity S322.

[0083] This structural arrangement has several advantages. First, it brings the N-pole structure 200 closer to the L-pole chamber S20 of the first L-pole structure 100a, facilitating the linkage between the operating mechanisms of the N-pole structure 200 and the first L-pole structure 100a. Second, the separation of the N-pole structure 200 from the trip unit chamber S31 prevents the impact of electric arcs on the leakage current trip unit 400. Third, the arrangement of the first chamber S321 and the second chamber S322 facilitates the placement of the circuit board assembly 410, and the specific position of the second chamber S322 allows for the passage of the zero-sequence current transformer 420 through the main circuit conductor.

[0084] like Figure 3 As shown, the circuit breaker housing 300 specifically includes a first housing 310, a second housing 320, a third housing 330, a fourth housing 340, a first sub-housing 350, and a second sub-housing 360.

[0085] Here, the length of the first shell 310, the second shell 320, and the fourth shell 340 is greater than that of the third shell 330, the first sub-shell 350, and the second sub-shell 360. Therefore, the chamber described above is formed by assembling these shells in this way.

[0086] like Figure 3 As shown, the concentrated area S3 is formed by the first shell 310, the second shell 320, the third shell 330, the fourth shell 340, the first sub-shell 350, and the second sub-shell 360.

[0087] like Figure 3 As shown, taking the first side of the concentrated region S3 along the length L as an example, the first housing 310, the second housing 320, the third housing 330, and the fourth housing 340 are arranged and spliced ​​sequentially along the width D, with a first terminal cavity S10 and an L-pole chamber S20 formed between each pair of housings. Specifically, the first housing 310 and the second housing 320 are spliced ​​together to form the first terminal cavity S10 and the L-pole chamber S20 of the first L-pole structure 100a. The second housing 320 and the third housing 330 are spliced ​​together to form the first terminal cavity S10 and the L-pole chamber S20 of the second L-pole structure 100. The third housing 330 and the fourth housing 340 are spliced ​​together to form the first terminal cavity S10 and the L-pole chamber S20 of the third L-pole structure 100.

[0088] like Figure 3As shown, taking the second side of the concentrated region S3 along the length L as an example, the first housing 310, the first sub-housing 350, the second housing 320, the second sub-housing 360, and the fourth housing 340 are arranged along the width D and sequentially spliced ​​to form the N-end sub-cavity S50 and three second terminal cavities S40. Specifically, the first housing 310 and the first sub-housing 350 are spliced ​​to form the N-end sub-cavity S50, and the through hole S60 through which the connecting wire 250 passes is also formed by splicing these two housings. The first sub-housing 350 and the second housing 320 are spliced ​​to form the second terminal cavity S40 of the first L-pole structure 100a. The second housing 320 and the second sub-housing 360 are spliced ​​to form the second terminal cavity S40 of the second L-pole structure 100. The second sub-housing 360 and the fourth housing 340 are spliced ​​to form the second terminal cavity S40 of the third L-pole structure 100.

[0089] like Figure 3 As shown, for each cavity in the concentrated area S3, the specific configuration is as follows: the N-pole cavity S30 is formed by splicing together a portion of the first housing 310 and the first sub-housing 350. The trip unit cavity S31 is formed by the second housing 320 and the first sub-housing 350, and the N-pole cavity S30 and the trip unit cavity S31 are separated by the first sub-housing 350.

[0090] Here, after these housings are assembled, they are riveted together by rivets 370 passing through the housings in sequence, which improves the stability of the circuit breaker housing 300.

[0091] This shell distribution and splicing method makes it easier to form the areas and cavities described above, and also facilitates product assembly.

[0092] like Figure 10 , Figure 11 as well as Figure 14 As shown, regarding the specific connection between the N-pole structure 200 and the L-pole operating mechanism 110 of the first L-pole structure 100a, the linkage 230 is specifically connected at one end to the contact support 113 and at the other end to the N-pole moving contact 210. The N-pole moving contact 210 includes an N-pole moving contact 211. The portion 212 connecting the N-pole moving contact 210 and the linkage 230, and the N-pole moving contact 211, are respectively located on both sides of the rotation center P2 of the N-pole moving contact 210. Thus, whether the L-pole operating mechanism 110 performs a closing operation or a opening operation, the rotation direction of the N-pole moving contact 210 is always opposite to the rotation direction of the L-pole moving contact 120.

[0093] The way the linkage 230 is connected to the contact support 113 is conducive to completing the opening and closing movements of the N-pole moving contact 210 and the L-pole moving contact 120.

[0094] like Figure 14As shown, the contact support 113 and the linkage 230, and the linkage 230 and the N-pole moving contact 210, can be connected in various ways. Taking a relatively simple method as an example, both use a hole-shaft mating structure, making assembly extremely convenient. For example, the contact support 113 has a first columnar structure 1131, one end of the linkage 230 is mounted on the first columnar structure 1131, and the other end of the linkage 230 is mounted on a second columnar structure 2301. The N-pole moving contact 210 is mounted on the second columnar structure 2301.

[0095] like Figure 10 , Figure 11 As shown, along the length direction L, the straight-line distance d1 from the rotation center of handle 111 to the rotation center P1 of L-pole moving contact 120 is less than the straight-line distance d2 from the rotation center P1 of L-pole moving contact 120 to the rotation center P2 of N-pole moving contact 210. This structure is more suitable for long RCBO type circuit breakers, making full use of the internal space.

[0096] like Figure 10 , Figure 11 As shown, in the height direction H, the straight-line distance d3 from the rotation center of handle 111 to the rotation center P1 of L-pole moving contact 120 is less than the straight-line distance d4 from the rotation center P1 of L-pole moving contact 120 to the rotation center P2 of N-pole moving contact 210. This structure is also more suitable for long RCBO type circuit breakers, making full use of the internal space.

[0097] like Figure 10 , Figure 11 As shown, to ensure the contact pressure of the N-pole moving contact 210, an N-pole contact spring 260 is connected between the N-pole moving contact 210 and the first housing 310. The N-pole contact spring 260 provides contact pressure to the N-pole moving contact 210. Here, the N-pole contact spring 260 is a tension spring, with one end connected to the first housing 310 and the other end connected to the N-pole moving contact 210. As the N-pole moving contact 210 rotates to the contact position and passes the dead point, the N-pole contact spring 260 stores energy and applies a force towards the N-pole stationary contact 220. Of course, the N-pole contact spring can also be a torsion spring.

[0098] like Figure 7As shown, the N-pole rotating post 270 on the first housing 310 has an oblong hole 2101. The size of the oblong hole 2101 is larger than the diameter of the N-pole rotating post 270. The oblong hole 2101 is fitted onto the N-pole rotating post 270 to form a rotating configuration for the N-pole moving contact 210. In other words, the N-pole moving contact 210 will no longer simply rotate, but can also slide relative to the N-pole rotating post 270 during rotation using the oblong hole 2101. This oblong hole 2101 design can increase the opening distance of the N-pole contact. Here, the N-pole rotating post 270 can be integrally formed on the first housing 310, or it can be inserted into the first housing 310 using a pin.

[0099] like Figure 7 As shown, in order to limit the maximum position of the N-pole moving contact 210, a limiting protrusion 3101 is also provided on the first housing 310. The limiting protrusion 3101 is located on one side of the N-pole moving contact 210. When the N-pole moving contact 210 moves to the limit position, it can contact the limiting protrusion 3101 for limiting.

[0100] like Figure 7 As shown, to improve the arc-extinguishing capability of the N-pole structure 200, the first housing 310 also has an N-pole moving contact arc-initiating angle 280 and an N-pole stationary contact arc-initiating angle 290. The N-pole moving contact arc-initiating angle 280 is inserted into the first housing 310 to initiate an arc on the N-pole moving contact 210, and the N-pole stationary contact arc-initiating angle 290 is integral with the N-pole stationary contact 220 to initiate an arc on the N-pole stationary contact 220. Alternatively, the N-pole stationary contact arc-initiating angle 290 is independently formed and fixed to the N-pole stationary contact 220.

[0101] like Figure 7 As shown, both the first housing 310 and the first sub-housing 350 have a first rib 35a and a second rib 35b, which are spaced apart along the length direction L. These ribs constitute the N-pole chamber S30. The first rib 35a on the first sub-housing 350 intersects with the first rib 35a on the first housing 310, and the second rib 35b on the first sub-housing 350 intersects with the second rib 35b on the first housing 310. This design of the first rib 35a and the second rib 35b makes it easier to form the N-pole region S, while ensuring electrical clearance with other components.

[0102] The linkage 230 passes through the first partition 35a and is connected to the N-pole moving contact 210.

[0103] like Figure 7As shown, to facilitate exhaust during the breakup of the N-electrode structure 200, the first housing 310 and the first sub-housing 350 are jointly provided with an N-electrode exhaust channel 35c. The lower surfaces of the first housing 310 and the first sub-housing 350 have N-electrode exhaust ports 35d, where the lower surface refers to the lower surface in the height direction H. Here, the N-electrode exhaust channel 35c has a meandering structure. This meandering structure means that the interior of the N-electrode exhaust channel 35c is winding and circuitous, rather than a straight channel. This structure prevents the electric arc from being directly ejected from the exhaust port. Here, the N-electrode exhaust channel 35c is provided with an anti-ionization structure 35e. The anti-ionization structure 35e is beneficial for adsorbing charged particles in the gas. Here, the anti-ionization structure 35e uses a perforated mesh plate; alternatively, metal wire mesh, metal mesh plates, etc., can also be used.

[0104] Specifically, the L-pole operating mechanism 110 trips as follows for the residual current circuit breaker 400.

[0105] like Figures 12-13 As shown, one end of the pull rod 114 is connected to the latch 112, and the other end of the pull rod 114 is the release part 114a.

[0106] like Figures 12-13 As shown, the trip lever 405 is rotatably mounted on the second housing 320 and the first sub-housing 350. Specifically, the trip lever 405 includes a rotating part 405c, a trip arm 405b connected to the periphery of the rotating part 405c, and a trigger arm 405a. The rotating part 405c is annular and is sleeved on the mounting post 325 on the second housing 320 and the first sub-housing 350. At least one rivet 370 passes through the mounting post 325, which improves the stability at this point and facilitates the rotation setting of the trip lever 405.

[0107] like Figures 12-13 As shown, along the length direction L, the trip lever 405 is located between the residual current device 400 and the pull rod 114. The trigger arm 405a extends to the vicinity of the actuation part of the residual current device 400 and cooperates with the actuation part. The trigger arm 405a extends to the vicinity of the tripping part 114a of the pull rod 114 and cooperates with the tripping part 114a. When a leakage occurs, the residual current device 400 actuates, causing the trigger arm 405a to move, resulting in the rotation of the trip lever 405. This causes the trigger arm 405a to move the pull rod 114, prompting the L-pole operating mechanism 110 to trip. Here, the reset of the trip lever 405 is achieved by the pull rod 114, which resets under the action of the pull rod 114 when the L-pole operating mechanism 110 performs a closing operation.

[0108] like Figures 12-13As shown, the dual-metal 140 is also located on one side of the tripping section 114a. When overloaded, the dual-metal 140 bends and pulls the tripping section 114a, causing the latch 112 to unlock. Here, the tripping section 114a is a straight rod-shaped part, and the parts of the tripping section 114a that trigger the tripping arm 405b and the dual-metal 140 belong to different sections of the tripping section 114a. Specifically, the tripping section 114a extends along the width direction D, and the tripping arm 405b and the dual-metal 140 contact different sections of the tripping section 114a.

[0109] like Figures 12-13 As shown, the lever arm from the center of rotation of the trigger arm 405a to the center of rotation of the trip lever 405 is designated as the first lever arm L1, and the lever arm from the center of rotation of the trip arm 405b to the center of rotation of the trip lever 405 is designated as the second lever arm L2. The first lever arm L1 is smaller than the second lever arm L2. This lever arm configuration can reduce the impact force of the leakage current trip unit 400 on the operating mechanism, as long as a suitable unlocking force can be output to unlock the latch 112.

[0110] In order to enable the reverse feed function.

[0111] The power supply to the circuit board assembly 410 is also controlled by the L-pole operating mechanism 110, the specific structure of which is as follows:

[0112] like Figure 8 , Figure 9 as well as Figure 4 As shown, each L-pole structure 100 includes a first conductive element 180 and a second conductive elastic element 190.

[0113] like Figure 8 , Figure 9 as well as Figure 4As shown, one end of each of the three first conductive elements 180 is electrically connected to the circuit board assembly 410. This electrical connection is achieved using leads and connectors. Specifically, the circuit board assembly 410 has a first connector 411, which is compatible with a second connector 412. The three first conductive elements 180 are connected to the second connector 412 via first leads 413. Once the second connector 412 is inserted into the first connector 411, the first conductive element 180 completes its electrical connection with the circuit board assembly 410. This connector method makes wiring very convenient. Simply connect the first lead 413 to the second connector 412 externally, and then insert it into the circuit board assembly 410 (first connector 411) inside the circuit breaker housing 300. Compared with the method of directly soldering the circuit board assembly 410 with leads, this method is beneficial to production (if the circuit board assembly 410 is soldered with leads, it is very difficult to solder in the small space of the circuit breaker housing 300; and if it is soldered externally and then the circuit board assembly 410 is put into the circuit breaker housing 300, it is easy to cause the solder joint to fall off).

[0114] like Figure 4 As shown, for the N-pole structure 200, its N-pole stationary contact 220 is also connected to the circuit board assembly 410 in this way. That is, one end of the power take-off lead 414 is soldered to the N-pole stationary contact 220, and the other end of the power take-off lead 414 is connected to the second connector 412, which can also have the effect of benefiting production.

[0115] Three second conductive elastic elements 190 are always electrically connected to their respective L-pole moving contacts 120 (here, the second conductive elastic element 190 is the contact spring of the L-pole moving contact 120, and the two are always in contact, thus maintaining electrical connection). One end of the second conductive elastic element 190 extends to a position 190a, which has a first position and a second position. Here, the first position is the position in contact with the first conductive element 180, and the second position is the position separated from the first conductive element 180.

[0116] When in the first position, the circuit board assembly 410 can draw power from the L-pole moving contact 120, and when in the second position, the circuit board assembly 410 cannot draw power from the L-pole moving contact 120.

[0117] Here, the extension end 190a is driven by the corresponding L-pole operating mechanism 110, and thus its position can change.

[0118] In other words, when the L-pole operating mechanism 110 is in the closed state, the extension end 190a is in the first position; when the L-pole operating mechanism 110 is in the open state, the extension end 190a is in the second position.

[0119] This PCB employs a three-pole power supply structure (first conductive element 180 and second conductive elastic element 190) to extract power, enriching the power extraction methods. Simultaneously, each first conductive element 180 and second conductive elastic element 190 forms a break point structure, driven by the corresponding L-pole operating mechanism 110. Power can only be extracted when the circuit is closed (when the extension end 190a is in the first position); when the circuit is open (when the extension end 190a is in the second position), the power supply between the circuit board assembly 410 and the L-pole moving contact 120 is cut off, thus enabling all three poles to perform reverse-current operation (as long as the L-pole operating mechanism 110 is in the open state, the power supply is cut off because the extension end 190a is in the second position; even with reverse-current operation, the circuit board cannot receive power and therefore will not burn out).

[0120] like Figures 8-9 As shown, the contact support 113 has an abutment protrusion 1132, and the extension end 190a abuts against the abutment protrusion 1132. As the contact support 113 rotates, the first position and the second position are changed. Such a structure is very convenient to assemble.

[0121] Here, there are many options for the first conductive element 180. It can be a non-elastic conductive element (such as a missile piece) or an elastic conductive element (such as a torsion spring, spring, or spring sheet).

[0122] In this embodiment, a torsion spring is used. This elastic conductive element can ensure that there is a certain contact pressure between the first conductive element 180 and the second conductive elastic element 190, thereby further improving the connection stability.

[0123] Here, there are many options for the second conductive elastic element 190, such as a torsion spring, a spring, or a spring sheet. In this embodiment, a torsion spring is used. The structure of a torsion spring is relatively easy to form, and it is easy to generate the extension end 190a, as well as its coil portion, which is convenient for installation and fixation.

[0124] In addition to being used to draw power from the circuit board assembly 410, the first conductive element 180 can also serve as part of the test structure.

[0125] like Figure 17 , Figure 21 As shown, the test structure includes a test button 500, a test moving spring 510, and a test static conductive component.

[0126] like Figure 4As shown, the first end of the test spring 510 is electrically connected to the circuit board assembly 410. Here, the electrical connection can be made directly by using a lead wire (second lead wire 415), or by using the combination of the connector and lead wire (using the second lead wire 415 to connect to the second connector 412), which is also convenient for processing. Moreover, this connector brings the advantage of easy processing, and the effect will be more obvious as the number of leads increases.

[0127] like Figure 17 , Figure 21 As shown, the second end 510a of the test moving spring 510 is normally open with the test stationary conductive component, which means it is normally disconnected. At this time, the test circuit (the circuit in the circuit board assembly 410, the test moving spring 510 and the test stationary conductive component are all components of this test circuit) is disconnected.

[0128] like Figure 17 , Figure 21 As shown, the second end 510a of the test moving spring 510 is located at the lower end of the test button 500. When the test button 500 moves under the action of external force, it drives the second end 510a of the test moving spring 510 to contact the test static conductive component, so that the test circuit can be turned on.

[0129] like Figure 17 , Figure 21 As shown, the test static conductive element here is the first conductive element 180 of the first L-polar structure 100a.

[0130] This test static conductivity component is a first conductive component 180, which can reduce the number of parts, achieve the effect of one piece serving multiple purposes, simplify the effect and reduce costs.

[0131] like Figure 17 , Figure 21 As shown, the test moving spring 510 and the test stationary conductive element are respectively disposed in different L-pole chambers S20. Specifically, the test button 500 and the test stationary conductive element (first conductive element 180) are disposed in the L-pole chamber S20 of the first L-pole structure 100a, while the test moving spring 510 is disposed in the L-pole chamber S20 of the second L-pole structure 100 (that is, the L-pole chamber S20 adjacent to the first L-pole structure 100a). The second end of the test moving spring 510 extends into the L-pole chamber S20 of the first L-pole structure 100a and cooperates with the test button 500.

[0132] By separating the test moving spring 510 and the test static conductive component into the housings of two different L-pole structures 100, the internal components of one L-pole structure 100 can be made too complex (being in one housing would lead to overly complex assembly and design), thus simplifying the design and assembly process.

[0133] like Figures 18-21 As shown, in the configuration where the test moving spring 510 and the test static conductive component are housed in two different L-pole structures 100, the test moving spring 510 is mounted on the mounting bracket 380, which is located within the second housing 320. Here, the mounting bracket 380 has a first mounting portion 380a, on which the test moving spring 510 is fixed. Since the test moving spring 510 in this embodiment is a torsion spring, it has a coil portion, and the first mounting portion 380a is a protruding post, with the coil portion fitted onto the protruding post. Here, the structure of the mounting bracket 380 only needs to be compatible with the structure of the test moving spring 510 to ensure the assembly of the test moving spring 510. For example, if the test moving spring 510 is a spring sheet or other type of spring, the first mounting portion 380a can be replaced with a suitable slot, protrusion, etc.

[0134] like Figures 18-19 As shown, with such a first mounting part 380a configured, when the second end 510a is driven by the test button 500, the second end 510a deforms with the first mounting part 380a as the fulcrum.

[0135] like Figure 17 , Figure 21 As shown, the mounting bracket 380 not only enables the installation of the test moving spring 510, but also improves the creepage distance between the test moving spring 510 and the first conductive element 180 (the first conductive element 180 of the second L-pole structure 100). In other words, in the width direction D, the test moving spring 510 is positioned between the test stationary conductive element and the first conductive element 180 of the second L-pole structure 100. The first conductive element 180 of the second L-pole structure 100 and the test moving spring 510 are located on opposite sides of the mounting bracket 380 in the width direction D, separated by the mounting bracket 380.

[0136] like Figure 17 , Figure 21 As shown, this separation method allows for various fixing methods for the first conductive element 180 of the second L-pole structure 100. It can be installed on the housing of the second L-pole structure 100 or on the mounting bracket 380. As a preferred method, the mounting bracket 380 also includes a second mounting portion 380b and a partition portion 380c. The first conductive element 180 of the second L-pole structure 100 is mounted on the second mounting portion 380b, and the partition portion 380c separates the first mounting portion 380a from the second mounting portion 380b, thus ensuring creepage distance. This mounting method simplifies the assembly of the first conductive element 180 of the second L-pole structure 100 and the test spring 510, allowing both to be mounted on the same mounting bracket 380 and then inserted into the housing of the second L-pole structure 100.

[0137] like Figure 20 As shown, the second housing 320 includes a first panel 320a. The side of the first panel 320a facing the first housing 310 forms the L-pole chamber S20 of the first L-pole structure 100a, and the side of the first panel 320a away from the first housing 310 forms the L-pole chamber S20 of the second L-pole structure 100. A through hole 320c is provided on the first panel 320a, through which the second end 510a of the test moving spring 510 engages with the test static conductive component. Simultaneously, a groove 320d is provided on the side of the first panel 320a away from the L-pole chamber S20 of the first L-pole structure 100a. The mounting bracket 380 is at least partially inserted into the groove 320d to achieve a relatively fixed position between the second housing 320 and the mounting bracket 380. Such a groove 320d and a through hole 320c on the first panel 320a ensure the insulation performance between the first L pole structure 100a and the second L pole structure 100. At the same time, the design of the groove 320d makes the installation of the mounting bracket 380 very easy.

[0138] For all the first conductors, a torsion spring is used, each having a coil portion. These coil portions correspond to a rivet 370 that fastens the circuit breaker housing 300 through the coil portions of all the first conductors 180. This through-structure design makes full use of the internal space of the circuit breaker, greatly making the internal structure more compact.

[0139] like Figures 18-19 As shown, a wiring structure 380d is also provided on the mounting bracket 380. In this embodiment, the wiring structure 380d is a wiring groove. One end of the second lead 415 is welded to the test moving spring 510. After passing through the wiring structure 380d, the second lead 415 is connected to the second connector 412. Of course, in addition to the wiring groove, the wiring structure 380d can also be a protrusion.

[0140] 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 miniature residual current circuit breaker, comprising a circuit breaker housing, an N-pole structure, a residual current component, and three L-pole structures; characterized in that: The circuit breaker housing is divided along its length into the first terminal area, the L-pole structure area, the concentration area, and the second terminal area. The first terminal region is divided into three first terminal cavities along the width direction, each accommodating a first terminal of a three L-pole structure. The central area accommodates the N-pole structure and leakage current components; The second terminal region is divided into three second terminal cavities and an N-terminal cavity along the width direction, which respectively accommodate the second terminal of the L-pole structure and the N-terminal of the N-pole structure; The L-pole structure region is divided into three L-pole chambers along the width direction, each accommodating one of the three L-pole structures. One of the L-pole structures located on the side of the width direction is the first L-pole structure, and the N-pole structure is located on one side of the first L-pole structure in the length direction. The N-pole structure includes a rotating N-pole moving contact, an N-pole stationary contact, and a sliding linkage; one end of the linkage is connected to the N-pole moving contact, and the other end of the linkage is linked to the L-pole operating mechanism of the first L-pole structure to realize the first L-pole structure driving the N-pole moving contact to move. The centralized area includes an N-pole chamber, a trip unit chamber, and an assembly chamber. The assembly chamber includes a first cavity and a second cavity that are connected. In the width direction, the trip unit chamber is located between the N-pole chamber and the first cavity, and the N-pole chamber is separated from the trip unit chamber. In the height direction, the second cavity is located below the common area of ​​the first cavity and the trip unit chamber, and part of the second cavity is located on one side of the N-pole chamber in the length direction. In the length direction, the N-pole chamber is located between the L-pole chamber of the first L-pole structure and part of the second cavity. The leakage current assembly includes a circuit board assembly, a leakage current trip unit, and a zero-sequence current transformer. The leakage current trip unit is disposed in the trip unit chamber, the circuit board assembly is disposed in the first cavity and / or the second cavity, and the zero-sequence current transformer is disposed in the second cavity. The circuit breaker housing includes a first housing, a second housing, a third housing, a fourth housing, a first sub-housing, and a second sub-housing; the concentrated area is formed by the first housing, the second housing, the third housing, the fourth housing, the first sub-housing, and the second sub-housing; the N-pole chamber is formed by part of the first housing and the first sub-housing; the trip unit chamber is formed by the second housing and the first sub-housing; the N-pole chamber and the trip unit chamber are separated by the first sub-housing; on one side of the concentrated area along its length, the first housing, the second housing, the third housing, and the fourth housing are arranged sequentially along their width, and a first terminal cavity and an L-pole chamber are formed between each pair of housings; on the other side of the concentrated area along its length, the first housing, the first sub-housing, the second housing, the second sub-housing, and the fourth housing are arranged along their width and are sequentially spliced ​​together to form the N-pole sub-housing and three second terminal cavities.

2. The miniature residual current circuit breaker according to claim 1, characterized in that: Each L-pole structure includes an L-pole moving contact, an L-pole stationary contact, and an L-pole operating mechanism. The L-pole operating mechanism includes a rotatable handle, a connecting rod, a rotatable contact support, and a latch rotatably mounted on the contact support. The L-pole moving contact rests on the contact support and moves with it. The three L-pole operating mechanisms are linked. When the L-pole operating mechanism is in the closed state, the latch is locked. When the latch is unlocked by external force, the L-pole operating mechanism performs a tripping operation. One end of the linkage is connected to the contact support of the first L-pole structure, and the other end is connected to the N-pole moving contact. The N-pole moving contact includes an N-pole moving point. The part of the N-pole moving contact connected to the linkage and the N-pole moving point are located on opposite sides of the rotation center of the N-pole moving contact. Regardless of whether the L-pole operating mechanism performs a closing or tripping operation, the rotation direction of the N-pole moving contact is always opposite to that of the L-pole moving contact.

3. A miniature residual current circuit breaker according to claim 2, characterized in that: Each L-pole structure includes a first conductive element and a second conductive elastic element; it also includes a second connector and a first connector mounted on the circuit board assembly. The three first conductive elements are connected to the second connector via a first lead, and the N-pole stationary contact is connected to the second connector via a power-taking lead. The first connector and the second connector cooperate to achieve electrical connection between the first conductive elements, the N-pole stationary contact, and the circuit board assembly. Each second conductive elastic element has an extension end extending toward the corresponding first conductive element. The extension end has a first position in contact with the first conductive element and a second position separated from the first conductive element. The extension end is driven by the L-pole operating mechanism to change position. When the L-pole operating mechanism is in the closed state, the extension end is in the first position; when the L-pole operating mechanism is in the open state, the extension end is in the second position. At this time, the power supply between the circuit board assembly and the L-pole moving contact is cut off.

4. A miniature residual current circuit breaker according to claim 3, characterized in that: It also includes a test structure, which includes a test button, a test moving spring, and a test static conductive component; the first conductive component of the first L-pole structure and the test static conductive component are the same component; the first end of the test moving spring is connected to the second connector through the second lead, and the second end of the test moving spring and the test static conductive component are normally open; the second end of the test moving spring is located at the lower end of the test button, and when the test button is moved under the action of external force, it drives the second end of the test moving spring to contact the test static conductive component.

5. A miniature residual current circuit breaker according to claim 4, characterized in that: The test button is located in the L-pole chamber where the first L-pole structure is located; the test moving spring is located in the L-pole chamber adjacent to the first L-pole structure via a mounting bracket, and the second end of the test moving spring is inserted into the L-pole chamber where the first L-pole structure is located to cooperate with the test button.

6. A miniature residual current circuit breaker according to claim 2, characterized in that: The L-pole structure also includes a double metal plate, and the L-pole operating mechanism also includes a pull rod. One end of the pull rod is connected to the latch, and the other end of the pull rod is a tripping part. The tripping part is located on one side of the double metal plate. When the double metal plate is bent, it contacts the tripping part, causing the pull rod to move and causing the L-pole operating mechanism to trip. It also includes a rotatably configured tripping rod. In the length direction, the trip lever is located between the residual current device and the pull rod of the first L-pole structure; the trip lever includes a trigger arm and a trip arm, the trigger arm is used to cooperate with the actuation part of the residual current device, and the trip arm is used to cooperate with the trip part; when the residual current device is actuated, it drives the trigger arm to move, causing the trip lever to rotate, so that the trip arm drives the pull rod to move, causing the L-pole operating mechanism to trip.

7. A miniature residual current circuit breaker according to claim 2, characterized in that: The structure connecting the L-pole operating mechanism and the linkage is a hole-shaft fit structure; And / or, the connection between the linkage and the N-pole moving contact is a hole-shaft mating structure; And / or, in the length direction, the straight-line distance from the rotation center of the handle to the rotation center of the L-pole moving contact is less than the straight-line distance from the rotation center of the L-pole moving contact to the rotation center of the N-pole moving contact; And / or, in the height direction, the straight-line distance from the rotation center of the handle to the rotation center of the L-pole moving contact is less than the straight-line distance from the rotation center of the L-pole moving contact to the rotation center of the N-pole moving contact.

8. A miniature residual current circuit breaker according to claim 2, characterized in that: An N-pole contact spring is connected between the N-pole moving contact and the circuit breaker housing, and the N-pole contact spring provides contact pressure for the N-pole moving contact. And / or, it also includes an N-pole rotating post disposed on the circuit breaker housing, the N-pole moving contact having an oblong hole, the size of which is larger than the diameter of the N-pole rotating post, the oblong hole being fitted onto the N-pole rotating post to form a rotating configuration of the N-pole moving contact, and the oblong hole and the N-pole rotating post sliding relative to each other during the rotation of the N-pole moving contact; And / or, it also includes a limiting protrusion on the circuit breaker housing, the limiting protrusion being located on the side of the N-pole moving contact to limit the maximum movement distance of the N-pole moving contact; And / or, it also includes the arc-starting angle of the N-pole moving contact and the arc-starting angle of the N-pole stationary contact, wherein the arc-starting angle of the N-pole stationary contact is fixed to the N-pole stationary contact or is an integral part thereof.

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