An electrical leakage circuit breaker

Abstract

The application discloses an electric leakage circuit breaker, wherein the electric leakage spring sheet is provided with a first contact part, and the first contact part is provided with a first contact area; a handle torsional spring is connected with the handle; the handle torsional spring is provided with a movable end, the movable end forms a second mechanical switch with the first contact area, and the movable end is driven by the handle to change the state of the second mechanical switch; the electric leakage spring sheet is provided with a limiting stop rib, and the limiting stop rib is arranged on both sides of the first contact area in a first direction of the electric leakage spring sheet, and is used for limiting the movable end from moving out of the first contact area in the first direction; and the application has the characteristics of limiting the transition deviation of the handle torsional spring.

Description

Technical Field

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

[0002] Test structures with reverse-feed functionality are not uncommon. For example, the miniature residual current circuit breaker disclosed in CN222672929U employs a double-break structure in its test circuit (capable of reverse-feed functionality). It utilizes the contact support during circuit breaker tripping to control the connection and disconnection of one break point, and uses a test button to control the connection and disconnection of the other break point. While this structure achieves a double-break configuration, it relies on contact support to control the connection and disconnection of one break point. Because the moving contact in the break point is elastic, when it is pressed down by the contact support, it generates a reaction force on the contact support. Since the contact support also drives the movement of the main line moving contact, this reaction force will have an undesirable impact on the connection action of the main line moving contact.

[0003] With the continuous development of this field, some structures have replaced the contact support driving a break point with a handle driving a handle torsion spring to achieve the function of a break point. The emergence of this structure has solved the problem of the influence of the contact support reaction force mentioned above. However, it also brings another problem. Since the handle needs to drive the handle torsion spring and the spring to form a break point, the handle torsion spring needs a movable end. The contact between this movable end and the spring achieves the connection of the break point, and the separation of the movable end and the spring achieves the separation of the break point. However, in actual use, since both this movable end and the spring are elastic, the direction of the elastic force generated after they come into contact is uncertain. This random elastic force will cause the movable end to deviate in an undesirable direction (for example, deviating in the width direction of the spring), causing the movable end to get stuck in the gap of the handle or other components on the width side of the spring, thus causing the handle to jam and the circuit breaker to malfunction.

[0004] Therefore, how to reduce the possibility of such offset at the active end is a problem worth considering. 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 circuit breaker.

[0006] This application provides: a residual current circuit breaker, comprising an instantaneous trip unit, a power-taking reed, a handle, a handle torsion spring, a test spring, a test stationary spring, a PCB board, and a test button; the test stationary spring is electrically connected to the PCB board, a first end of the test spring and the test stationary spring form a first mechanical switch, and the test button cooperates with the first end to drive the first end of the test spring to move, thereby changing the state of the first mechanical switch; the test spring, the handle torsion spring, and the PCB board are electrically connected, and the power-taking reed is electrically connected to the instantaneous trip unit; wherein, the power-taking reed has a first contact portion, and the first contact portion has a first contact area; the handle torsion spring is connected to the handle; the handle torsion spring has a movable end, and the movable end and the first contact area form a second mechanical switch, the movable end being driven by the handle to change the state of the second mechanical switch; the power-taking reed is provided with limiting ribs, which are respectively disposed on both sides of the first contact area in a first direction of the power-taking reed, for limiting the movable end from moving out of the first contact area in the first direction.

[0007] In some embodiments of this application, in the height direction of the circuit breaker, the instantaneous trip unit is located below the handle, the power take-up spring is located between the instantaneous trip unit and the handle, the first contact portion extends obliquely toward the direction of the handle, and the limiting stop rib is located at the end of the first contact portion near the end of the handle.

[0008] In some embodiments of this application, the number of limiting ribs is two, and the interval between the first contact areas in the first direction is a first interval, which is greater than the wire diameter of the handle torsion spring.

[0009] In some embodiments of this application, the number of limiting ribs is two, which are integrally formed with the power-taking spring or fastened by a fastening structure.

[0010] In some embodiments of this application, the instantaneous trip unit includes a magnetic yoke, and the power-taking spring includes an elastic contact portion. The elastic contact portion contacts the magnetic yoke to form an electrical connection between the power-taking spring and the instantaneous trip unit, and the elastic contact portion has deformation when in contact.

[0011] In some embodiments of this application, the power-taking reed includes a U-shaped locking part, one end of the first contact part is connected to the U-shaped locking part, and the other end of the U-shaped locking part extends toward the direction of the handle; it also includes a circuit breaker housing, which has an instantaneous tripping cavity, a handle mounting cavity and a partition rib, the partition rib being located between the instantaneous tripping cavity and the handle mounting cavity, and the U-shaped locking part being engaged with a portion of the partition rib.

[0012] In some embodiments of this application, the circuit breaker housing includes a first housing and a second housing, which are fixed together; the instantaneous tripping cavity and the handle mounting cavity are formed by the first housing and the second housing together; the dividing rib includes a first sub-rib disposed on the first housing and a second sub-rib disposed on the second housing, which are staggered; and the U-shaped clip is secured to the first sub-rib.

[0013] In some embodiments of this application, a partition bar is also included, which is connected to one side of the first sub-bar in the length direction of the circuit breaker housing. A limiting protrusion is provided on the first sub-bar. There is a second gap between the limiting protrusion and the partition bar in the length direction of the circuit breaker housing. The U-shaped locking part is locked on the first sub-bar and located in the second gap to limit the shaking of the U-shaped locking part.

[0014] In some embodiments of this application, in the height direction of the circuit breaker housing, the first sub-rib is located above or below the second sub-rib, and the second sub-rib is provided with an avoidance groove, the avoidance groove avoiding the U-shaped locking part.

[0015] In some embodiments of this application, a first lead is soldered between the test stationary spring and the PCB board to form an electrical connection, one end of the test spring is soldered to the handle torsion spring, and a second lead is soldered between the test spring and the PCB board to form an electrical connection.

[0016] In some embodiments of this application, the movable end of the handle torsion spring is arc-shaped, and during the rotation of the handle toward the closing direction, the movable end contacts the first contact portion.

[0017] In some embodiments of this application, the circuit breaker housing, operating mechanism, bimetallic strip, bimetallic pull rod, leakage current transition element, and leakage current trip unit are also included. The operating mechanism includes a latch, one end of the bimetallic pull rod is connected to the latch, and the other end of the bimetallic pull rod is a trigger terminal. The actuation direction of the leakage current trip unit is parallel to the length direction of the circuit breaker housing. The leakage current transition element is slidably disposed relative to the circuit breaker housing, one end of the leakage current transition element is connected to the leakage current trip unit, and the leakage current trip unit drives the leakage current transition element to move when actuated. The bimetallic strip and the leakage current transition element are arranged sequentially in the width direction of the circuit breaker housing. The trigger terminal has a straight structure, and the bimetallic strip and the leakage current transition element respectively cooperate with different areas of the trigger terminal.

[0018] In some embodiments of this application, the circuit breaker housing includes a first housing, a second housing, and a partition. The partition is disposed between the first housing and the second housing, and a groove is provided on the partition. The leakage current transition member is at least partially embedded in the groove and slides along the groove.

[0019] In some embodiments of this application, the circuit breaker housing includes a first housing, a second housing, and a partition. The partition is disposed between the first housing and the second housing. A leakage current transition member is slidably disposed on the partition. A baffle is disposed on the partition and abuts against the leakage current transition member to limit the displacement of the leakage current transition member and the partition in the width direction of the circuit breaker housing.

[0020] In some embodiments of this application, the circuit breaker housing includes a first housing, a second housing, and a partition. The partition is disposed between the first housing and the second housing. A leakage current transition member is slidably disposed on the partition. A leakage current trip unit is located on one side of the partition. The partition has an opening on the side facing the leakage current trip unit. The leakage current transition member is at least partially exposed at the opening, and the exposed portion is used to connect with the leakage current trip unit.

[0021] The advantages of this application compared to the prior art are:

[0022] Compared to existing technologies, this application associates the movement of the second mechanical switch with the handle. The opening and closing movement of the handle can change the working state of the second mechanical switch. At the same time, a limiting rib is set in the first direction (or width direction) of the power-taking spring. Even if the moving end comes into contact with the first contact area and causes the moving end to deviate in an undesirable direction (for example, deviating in the width direction of the spring), the limiting rib can effectively prevent the moving end from continuing to deviate and prevent the moving end from moving to a position where it is jammed with the handle and other components, thereby ensuring the normal use of the circuit breaker's operating mechanism. Attached Figure Description

[0023] 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.

[0024] Figure 1 A perspective view of a residual current circuit breaker according to an embodiment of this application is shown;

[0025] Figure 2 An internal schematic diagram of a residual current circuit breaker according to an embodiment of this application is shown;

[0026] Figure 3 This application shows a diagram illustrating the positional relationship between the experimental structure and the circuit board in an embodiment of the present application.

[0027] Figure 4 A schematic diagram of the test circuit in the disconnected state (both mechanical switches are disconnected) in an embodiment of this application is shown;

[0028] Figure 5A schematic diagram of the test circuit in the disconnected state (both mechanical switches are disconnected) in an embodiment of this application is shown;

[0029] Figure 6 A schematic diagram of the reed switch in an embodiment of this application is shown;

[0030] Figure 7 A partially enlarged view of the location where the reed switch is installed is shown in an embodiment of this application;

[0031] Figure 8 A partially enlarged schematic diagram of the second housing in an embodiment of this application is shown;

[0032] Figure 9 This illustration shows a partially enlarged schematic diagram of the mating point between the first housing and the power-collecting spring in an embodiment of this application.

[0033] Figure 10 This is a schematic diagram of an orthographic projection of the active end in contact with the first contact portion in an embodiment of this application;

[0034] Figure 11 This paper shows a diagram illustrating the positional relationship between the residual current device, the bimetallic strip, and the bimetallic lever in an embodiment of this application.

[0035] Figure 12 A schematic diagram of the double-metal tie rod in an embodiment of this application is shown;

[0036] Figure 13 A schematic diagram of the leakage current transition element in an embodiment of this application is shown;

[0037] Figure 14 A schematic diagram showing the latch in the closed state in an embodiment of this application is shown;

[0038] Figure 15 This illustration shows a schematic diagram of the latch rotating due to overload protection in an embodiment of this application.

[0039] Figure 16 This illustration shows a schematic diagram of the latch rotating due to leakage protection in an embodiment of this application.

[0040] Figure 17 A schematic diagram of the partition in an embodiment of this application is shown;

[0041] Figure 18 A schematic diagram of the partition, double-metal tie rod, and leakage current transition component in an embodiment of this application is shown. Detailed Implementation

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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

[0047] like Figures 1-3As shown, a residual current circuit breaker includes a circuit breaker housing 100, and the circuit breaker housing 100 is provided with an operating mechanism, a PCB board 800, an instantaneous trip unit 700, a test circuit, a residual current trip unit 300, a bimetallic strip 400, a contact assembly, etc.

[0048] The circuit breaker housing 100 includes a first housing 110 and a second housing 120, which are spliced ​​together and fastened with rivets.

[0049] The operating mechanism employs a four-bar linkage, which includes a handle 201, a handle torsion spring 202, a connecting rod, a trip latch, a locking latch 203, and contact supports. The transmission relationships of these components are common knowledge in the field and will not be elaborated upon here. Alternatively, an operating mechanism without a trip latch can also be used; this is also common knowledge and will not be elaborated upon here. Regardless of whether the four-bar linkage has a trip latch or not, if the locking latch 203 is rotated when the circuit is closed, the temporary stable state of the mechanism will be broken, and the operating mechanism will perform a trip operation. There are many situations that can cause the locking latch 203 to rotate, including overload, leakage current, and short circuit. Since this application mainly improves the structure related to overload and leakage current, the following description focuses on the structures related to overload and leakage current. Here, the handle torsion spring 202 is connected to the handle 201. When the handle 201 moves toward the closed position, the handle torsion spring 202 stores energy. When the handle 201 is about to move toward the open position, the handle torsion spring 202 releases energy to accelerate the handle 201 toward the open position. Here, in addition to serving as the reset element of the handle 201, the handle torsion spring 202 is also a component of the mechanical switch of the test circuit and the leakage protection circuit.

[0050] like Figure 2 As shown, the instantaneous trip unit 700 is a solenoid-type electromagnetic trip unit, including a magnetic yoke 701, a coil, an armature, etc. The instantaneous trip unit 700 itself is common knowledge and will not be described in detail here. Here, the magnetic yoke 701 and the coil are electrically connected to the terminals on one side of the circuit breaker, that is, they are at the same potential.

[0051] PCB board 800 contains test circuits, leakage protection circuits, etc. The electrical schematic diagrams of the test circuits and leakage protection circuits are common knowledge. This application mainly focuses on improving the mechanical switch structure on the test circuits and leakage protection circuits, so the electrical schematic structure of the test circuits and leakage protection circuits will not be described in detail here.

[0052] like Figures 3-5As shown, the mechanical switch used in the test circuit and leakage protection circuit includes a power-on reed 810, a handle torsion spring 202, a test spring 820, a test stationary spring 830, and a test button 840.

[0053] The test stationary spring 830 is soldered to the PCB board 800 with a first lead 850, and an electrical connection is formed through the first lead 850.

[0054] A second lead 860 is soldered between the test spring 820 and the PCB board 800, forming an electrical connection.

[0055] The first end of the test spring 820 and the test stationary spring 830 are normally open. The test button 840 is located above the first end and is slidably disposed with respect to the circuit breaker housing 100. Here, the first end of the test spring 820 and the test stationary spring 830 form a first mechanical switch K1. When the test button 840 is pressed down, the first mechanical switch K1 is turned on. When the external force on the test button 840 is removed, the elasticity of the first end of the test spring 820 causes the test button 840 to reset.

[0056] The reed switch 810 is electrically connected to the instantaneous trip unit 700. The test spring 820 is welded to one end of the handle torsion spring 202. The other end of the handle torsion spring 202 (movable end 202a) is normally open (normally open when the circuit breaker is open) with the first contact area 810c of the reed switch 810. Here, the movable end 202a and the first contact area 810c form a second mechanical switch K2. The movable end 202a is driven by the handle 201. When the handle 201 moves in the closing direction, the movable end 202a contacts the first contact area 810c, and the second mechanical switch K2 is activated. Figure 4 As shown; when the handle 201 moves in the opening direction, the movable end 202a contacts the second contact area, and the second mechanical switch K2 separates, as... Figure 5 As shown.

[0057] Here, the second mechanical switch K2 serves two purposes. First, it acts as part of the test circuit; the test circuit can only be completed when both the first mechanical switch K1 and the second mechanical switch K2 are simultaneously closed, thus generating a simulated leakage current to test the leakage current function of the residual current circuit breaker. Second, the second mechanical switch K2 is the power source for the residual current protection circuit. Only when the second mechanical switch K2 is closed can the residual current protection circuit connect to the main line and draw power. Therefore, even if the circuit breaker is reverse-wired, as long as the circuit breaker is not closed, the PCB board 800 cannot draw power from the main line, preventing the PCB board 800 and the residual current trip unit 300 from being continuously energized.

[0058] like Figure 6 , Figure 10As shown, the first contact portion 810a of the power-taking reed 810 includes a first contact area 810c and a limiting rib 810b. Here, the limiting rib 810b is located on both sides of the first contact area 810c in a first direction, where the first direction is the width direction L2 of the circuit breaker. This limiting rib 810b design prevents the movable end 202a from shifting into the gap between itself and the handle 201 after contacting the first contact area 810c, even if an undesirable directional deviation occurs, thus preventing jamming and ensuring the normal operation of the circuit breaker's operating mechanism.

[0059] Here, the movable end 202a of the handle torsion spring 202 is arc-shaped. With this structure, as the handle 201 rotates in the closing direction, the arc-shaped movable end 202a can slowly contact the first contact part 810a. The arc-shaped movable end 202a adapts to the rotational movement of the handle 201 and the contact with the first contact part 810a is smoother, ensuring the stability of the contact.

[0060] Looking inside the circuit breaker, along the height direction L3, the instantaneous trip unit 700 is located below the handle 201, and the contact spring 810 is located between the instantaneous trip unit 700 and the handle 201. The first contact portion 810a extends obliquely upwards, that is, obliquely towards the direction of the handle 201. This extension arrangement is more conducive to contact with the movable end 202a. Here, the limiting rib 810b is located at the end of the first contact portion 810a near the handle 201.

[0061] like Figure 6 , Figure 10 As shown, there are two limiting ribs 810b, and the interval between the first contact areas 810c in the first direction is a first interval D1, which is greater than the wire diameter of the handle torsion spring 202. This first interval D1 setting makes the contact area between the power-taking spring 810 and the movable end 202a more reasonable, with enough space to contact the movable end 202a, and also enough space for the movable end 202a to undergo a certain amount of offset. This offset will not cause the handle 201 to jam because of the limiting ribs 810b. Therefore, the joint design of the first interval D1 and the limiting rib 810b can not only prevent the handle 201 from jamming, but also prevent the handle torsion spring 202 from being too forceful and affecting operation due to the small offset space of the movable end 202a (because if the movable end 202a adopts a zero-matching relationship with the limiting rib 810b, that is, the first interval D1 and the torsion spring wire diameter are the same, the elastic force generated after the movable end 202a contacts the first contact area 810c will be relatively large).

[0062] Here, the limiting rib 810b and the power-taking spring 810 are integrally formed, that is, the limiting rib 810b is formed by bending the power-taking spring 810. Of course, in addition, the limiting rib 810b can also be formed separately from the power-taking spring 810, and then fastened to the power-taking spring 810 by welding, snap-fitting, screw fastening, plugging, riveting and other fastening structures.

[0063] like Figures 6-9 As shown, the power-taking reed 810 is snapped onto the circuit breaker housing 100. Specifically, the power-taking reed 810 includes a U-shaped locking portion 810d, one end of the first contact portion 810a is connected to the U-shaped locking portion 810d, and the other end of the U-shaped locking portion 810d extends toward the direction of the handle 201.

[0064] like Figures 6-9 As shown, the circuit breaker housing 100 has an instantaneous tripping chamber and a handle mounting chamber inside, with a partition rib 140 between the instantaneous tripping chamber and the handle mounting chamber. The U-shaped locking part 810d is engaged with part of the partition rib 140. This structure makes the installation of the power-taking spring 810 very convenient; it only needs to be engaged with the partition rib 140.

[0065] like Figure 6 As shown, the electrical connection between the power-taking spring 810 and the magnetic yoke 701 is achieved through contact between the power-taking spring 810 and the magnetic yoke 701. Here, the power-taking spring 810 includes an elastic contact portion 810e, which contacts the magnetic yoke 701 to form an electrical connection between the power-taking spring 810 and the instantaneous trip unit 700, and the elastic contact portion 810e undergoes deformation upon contact. As a more preferred option, the elastic contact portion 810e is an arm of the U-shaped card portion 810d.

[0066] like Figure 6 As shown, this elastic contact portion 810e ensures stable contact and electrical connection between the power-taking spring 810 and the magnetic yoke 701. Simultaneously, the elastic contact portion 810e is an arm of the U-shaped locking portion 810d. Thus, the elastic contact portion 810e, deformed by the magnetic yoke 701, allows for a tighter and more stable connection between the U-shaped locking portion 810d and the separating rib 140.

[0067] like Figure 9As shown, the circuit breaker housing 100 comprises a first housing 110 and a second housing 120. Therefore, the instantaneous tripping cavity and the handle mounting cavity are both formed by the first housing 110 and the second housing 120. The partition rib 140 has two parts: a first sub-rib 140a disposed on the first housing 110 and a second sub-rib 140b disposed on the second housing 120. The first sub-rib 140a and the second sub-rib 140b are staggered. The U-shaped locking part 810d is locked onto the first sub-rib 140a.

[0068] like Figure 7 As shown, the first sub-rib 140a and the second sub-rib 140b are staggered. In the height direction of the circuit breaker housing 100, the first sub-rib 140a can be located above or below the second sub-rib 140b. In this embodiment, it is located below the second sub-rib 140b. A clearance groove 140b1 is provided on the second sub-rib 140b, and one arm of the U-shaped locking part 810d is located within the clearance groove 140b1, which can also be described as being located between the first sub-rib 140a and the second sub-rib 140b. This design of the clearance groove 140b1 makes the assembly of the U-shaped locking part 810d and the separating rib 140 more compact and miniaturized, and also improves the stability of the U-shaped locking part 810d.

[0069] like Figures 9-10 As shown, the circuit breaker housing 100 also includes a partition 150, which is further divided into a first partition 150a on the first housing 110 and a second partition 150b on the second housing 120. Here, the partition 150 mainly separates the instantaneous trip unit 700 cavity from the mechanism cavity. A limiting protrusion 140a1 is provided on the first sub-rib 140a. The limiting protrusion 140a1 and the partition 150 are separated by a second gap D2 in the length direction of the circuit breaker housing 100. The U-shaped locking part 810d is locked on the first sub-rib 140a and located in the second gap D2 to limit the shaking of the U-shaped locking part 810d. This design of the limiting protrusion 140a1 can ensure the installation stability and convenience of the U-shaped locking part 810d. When installing the U-shaped locking part 810d, only its opening needs to face the second gap D2, and the installation can be completed by pushing the U-shaped locking part 810d, which is very convenient and stable.

[0070] like Figure 11 As shown, the leakage current trip unit 300 is a voltage trip unit, which includes a voltage coil, a moving iron core, an actuating rod 310, etc. When the voltage coil is energized, the moving iron core and the actuating rod 310 can slide (that is, the leakage current trip unit 300 is actuated). In this embodiment, the moving iron core and the actuating rod 310 are integrally formed. Alternatively, these two can be separately formed and then assembled together.

[0071] Here, the actuation direction of the actuator 310 is parallel to the length direction L1 of the circuit breaker housing 100. Alternatively, the actuation direction of the actuator 310 can form an acute angle with the length direction L1 of the circuit breaker housing 100. In this case, the residual current trip unit 300 with such an acute angle configuration will have at least one decomposed force direction parallel to the length direction L1 of the circuit breaker housing 100.

[0072] like Figure 11 As shown, the leakage current transition member 500 is movable. This movable configuration can be either rotational or sliding; in this embodiment, it is sliding. One end of the leakage current transition member 500 is connected to the actuation rod 310 of the leakage current trip unit 300, and the leakage current transition member 500 can also slide accordingly after the leakage current trip unit 300 is actuated.

[0073] like Figure 2 As shown, the bimetallic strip 400 is connected in the main circuit conductor and can be bent by heat when the main circuit is overloaded (that is, the actuation of the bimetallic strip 400).

[0074] like Figure 12 As shown, the dual-metal pull rod 600 has a multi-bend structure, specifically a four-bend structure in this embodiment. However, the total number of bends should not exceed five. The dual-metal pull rod 600 includes a connector 610, a guide section 620, and a trigger end 630. The connector 610 and guide section 620 form a bend at their connection point. The guide section 620 itself has two bends, and the guide section 620 and trigger end 630 form a bend.

[0075] like Figure 12 As shown, the trigger terminal 630 has a straight structure and is used to drive either the bimetallic strip 400 or the leakage current transition element 500. Since the bimetallic strip 400 and the leakage current transition element 500 are arranged sequentially in the width direction L2 of the circuit breaker housing 100, the bimetallic strip 400 and the leakage current transition element 500 respectively cooperate with different areas of the trigger terminal 630.

[0076] It is this straight structural design that reduces the total number of bends in the Double Gold Tie Rod 600, which simplifies the structure and manufacturing process.

[0077] Here, the trigger terminal 630 can be positioned along the width direction L2 of the circuit breaker housing 100 (i.e., they are aligned); or the trigger terminal 630 can be positioned approximately along the width direction L2 of the circuit breaker housing 100 (i.e., although there is a small acute angle between them, generally controlled within 10°, the trigger terminal 630 still appears to extend towards the width direction L2 of the circuit breaker housing 100). Regardless of the method used, this structure of the trigger terminal 630 facilitates cooperation with the bimetallic strip 400 and the leakage current transition element 500.

[0078] like Figure 13 As shown, the leakage current transition piece 500 includes a slot 510, into which the actuating rod 310 of the leakage current trip unit 300 is inserted, thus enabling the two to be linked. Here, the overall shape of the slot 510 is approximately U-shaped, and it has a groove on one surface of the leakage current transition piece 500. The end of the actuating rod 310 of the leakage current trip unit 300 has a thick rod portion and a thin rod portion, and a portion of the thin rod portion and the thick rod portion are inserted together into the slot 510.

[0079] This structure makes the assembly of the two parts very simple and also facilitates the processing of the leakage current transition component 500.

[0080] There are many materials that can be chosen for the leakage current transition element 500, including metal and plastic. In this embodiment, plastic is used.

[0081] like Figure 13 As shown, the leakage current transition element 500 includes a travel groove 520. The travel groove 520 has multiple groove walls, and in this embodiment, its shape is approximately rectangular. One of its shorter groove walls is the drive wall 520a, which pushes the trigger end 630 to move when the leakage current trip unit 300 is actuated. When the bimetallic strip 400 is actuated, the trigger end 630 moves away from the drive wall, and this movement is a no-travel movement (no-travel movement means that no transmission relationship occurs between the two).

[0082] The design of this stroke groove 520 allows the actuation of overload protection to be separated from the actuation of leakage protection, which is more conducive to using a single double gold pull rod 600 to achieve the rotation of the latch 203.

[0083] The mating point M1 between the drive wall and the trigger end 630 and the connection point M2 between the actuating rod 310 and the leakage current transition piece 500 are misaligned in the width direction L2 of the circuit breaker housing 100.

[0084] This misalignment design allows the structure of the leakage current transition component 500 to be as simple as possible, and it is compatible with the bimetallic strip 400 and the leakage current trip unit 300.

[0085] Here, the circuit breaker housing 100 also has a partition 130 inside.

[0086] This partition 130 is used to divide the interior of the circuit breaker housing 100 into a live wire chamber and a neutral wire chamber.

[0087] Because the contact assembly includes a live wire moving contact, a live wire stationary contact, a neutral wire moving contact, and a neutral wire stationary contact, the neutral wire moving contact and the neutral wire stationary contact cooperate with each other, and the live wire moving contact and the live wire stationary contact cooperate with each other. A partition 130 separates the live wire moving contact from the neutral wire moving contact, and the live wire stationary contact from the neutral wire stationary contact. The partition 130 is riveted and spliced ​​to the first housing 110 and the second housing 120 for fastening.

[0088] Here, the moving contact of the live wire and the moving contact of the neutral wire are both mounted on a single contact support. This allows the moving contact of the live wire to contact and separate from the stationary contact of the live wire under the action of the operating mechanism, and the moving contact of the neutral wire to contact and separate from the stationary contact of the neutral wire.

[0089] The bimetallic strip 400 and the moving contact of the live wire are electrically connected in the circuit, specifically through a flexible connection soldering to form the electrical connection.

[0090] like Figures 17-18 As shown, the leakage current transition element 500 is slidably mounted on the partition 130.

[0091] like Figures 17-18 As shown, a groove 1301 is provided on the partition 130, and the leakage current transition member 500 is partially embedded in the groove 1301 and slides along the groove 1301.

[0092] This sliding design makes the installation of the leakage current transition piece 500 simpler and the sliding direction more reliable.

[0093] like Figures 17-18 As shown, a baffle 1302 is provided on the partition 130. The baffle 1302 blocks one side (non-sliding direction) of the leakage current transition member 500 and abuts against the leakage current transition member 500. Such a baffle 1302 can prevent the leakage current transition member 500 and the partition 130 from shifting in the width direction L2 of the circuit breaker housing 100, and ensure that the movement of the leakage current transition member 500 is more stable.

[0094] like Figures 17-18As shown, viewed from inside the circuit breaker housing 100, the residual current device 300 is located on one side of the partition 130. The partition 130 has an opening 1303 on the side facing the residual current device 300. The residual current transition member 500 is at least partially exposed at the opening 1303. The portion of the residual current transition member 500 with a slot 510 is exposed outside the partition 130 and connected to the actuating rod 310.

[0095] like Figures 17-18 As shown, guide ribs 1304 are provided on the partition 130. There are two guide ribs 1304, which are spaced apart. The guide section 620 of the bimetallic strip 600 is located between the guide ribs 1304. When the bimetallic strip 400 or the leakage trip device 300 is actuated, the bimetallic strip 600 moves along the guide ribs 1304 or the guide groove.

[0096] Of course, the guide rib 1304 can also be replaced by a guide groove structure.

[0097] Both the guide rib 1304 and the guide groove play a guiding role in the movement of the double gold tie rod 600, ensuring that the double gold tie rod 600 can more effectively pull the lock 203 to rotate and reduce unnecessary movements.

[0098] This structure will facilitate the assembly of the leakage current transition component 500 and the actuating rod 310.

[0099] 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.

[0100] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An electric leakage circuit breaker, comprising a instantaneous tripper, a power spring, a handle, a handle torsion spring, a test spring, a test static spring, a PCB board and a test button; the test static spring is electrically connected with the PCB board, a first end of the test spring forms a first mechanical switch with the test static spring, the test button cooperates with the first end to drive the first end of the test spring to move, so as to change the state of the first mechanical switch; the test spring, the handle torsion spring and the PCB board are electrically connected, and the power spring is electrically connected with the instantaneous tripper; characterized in that: The power-taking reed has a first contact portion with a first contact area; a handle torsion spring is connected to the handle; the handle torsion spring has a movable end, which forms a second mechanical switch with the first contact area, and the movable end is driven by the handle to change the state of the second mechanical switch; the power-taking reed is provided with limiting ribs, which are respectively located on both sides of the first contact area in the first direction of the power-taking reed, to limit the movable end from moving out of the first contact area in the first direction; the power-taking reed includes a U-shaped locking portion, one end of the first contact portion is connected to the U-shaped locking portion, and the other end of the U-shaped locking portion extends toward the direction of the handle; it also includes a circuit breaker housing, which has an instantaneous tripping cavity, a handle mounting cavity, and a separating rib, the separating rib being located in the instantaneous tripping cavity. Between the latching cavity and the handle mounting cavity, the U-shaped locking part is engaged with a portion of the partition rib; it also includes a circuit breaker housing, an operating mechanism, a bimetallic strip, a bimetallic pull rod, a residual current device (RCD) transition piece, and an RCD release; the operating mechanism includes a latch, one end of the bimetallic pull rod is connected to the latch, and the other end of the bimetallic pull rod is the trigger end; the actuation direction of the RCD release is parallel to the length direction of the circuit breaker housing; the RCD transition piece is slidably disposed relative to the circuit breaker housing, one end of the RCD transition piece is connected to the RCD release, and the RCD release moves the RCD transition piece when actuated; the bimetallic strip and the RCD transition piece are arranged sequentially in the width direction of the circuit breaker housing; the trigger end has a straight structure, and the bimetallic strip and the RCD transition piece respectively cooperate with different areas of the trigger end.

2. An electrical leakage circuit breaker according to claim 1, wherein: In the height direction of the circuit breaker, the instantaneous trip unit is located below the handle, the power take-up spring is located between the instantaneous trip unit and the handle, the first contact part extends obliquely in the direction of the handle, and the limiting stop is located at the end of the first contact part near the handle.

3. A residual current circuit breaker according to claim 1, characterized in that: The number of the limiting ribs is two, and the interval between them in the first direction of the first contact area is the first interval, which is greater than the wire diameter of the handle torsion spring. And / or, the number of the limiting ribs is two, which are integrally formed with the power-taking spring or fastened by a fastening structure.

4. A residual current circuit breaker according to claim 1, characterized in that: The instantaneous trip unit includes a magnetic yoke, and the power-taking spring includes an elastic contact portion. The elastic contact portion contacts the magnetic yoke to form an electrical connection between the power-taking spring and the instantaneous trip unit, and the elastic contact portion has a deformation when in contact.

5. A residual current circuit breaker according to claim 1, characterized in that: The circuit breaker housing includes a first housing and a second housing, which are fixed together. The instantaneous tripping cavity and the handle mounting cavity are formed by the first housing and the second housing together. The dividing rib includes a first sub-rib on the first housing and a second sub-rib on the second housing. The first sub-rib and the second sub-rib are staggered. The U-shaped clip is fastened to the first sub-rib.

6. A residual current circuit breaker according to claim 5, characterized in that: It also includes a partition bar, which is connected to one side of the first sub-bar in the length direction of the circuit breaker housing. A limit protrusion is provided on the first sub-bar. There is a second gap between the limit protrusion and the partition bar in the length direction of the circuit breaker housing. The U-shaped locking part is locked on the first sub-bar and located in the second gap to limit the shaking of the U-shaped locking part. And / or, in the height direction of the circuit breaker housing, the first sub-rib is located above or below the second sub-rib, and the second sub-rib is provided with a clearance groove, the clearance groove having a U-shaped locking part for clearance.

7. A residual current circuit breaker according to claim 1, characterized in that: A first lead is soldered between the test stationary spring and the PCB board to form an electrical connection. One end of the test spring is soldered to the handle torsion spring. A second lead is soldered between the test spring and the PCB board to form an electrical connection. And / or, the movable end of the handle torsion spring is arc-shaped, and during the rotation of the handle toward the closing direction, the movable end contacts the first contact part.

8. A residual current circuit breaker according to claim 1, characterized in that: The circuit breaker housing includes a first housing, a second housing, and a partition. The partition is disposed between the first housing and the second housing. A groove is provided on the partition, and a leakage current transition member is at least partially embedded in the groove and slidably disposed along the groove. And / or, the circuit breaker housing includes a first housing, a second housing, and a partition, the partition being disposed between the first housing and the second housing, a leakage current transition piece being slidably disposed on the partition, a baffle being disposed on the partition, the baffle abutting against the leakage current transition piece, thereby limiting the displacement of the leakage current transition piece and the partition in the width direction of the circuit breaker housing; And / or, the circuit breaker housing includes a first housing, a second housing, and a partition, the partition being disposed between the first housing and the second housing, a leakage current transition member being slidably disposed on the partition, a leakage current trip unit being located on one side of the partition, the partition having an opening on the side facing the leakage current trip unit, the leakage current transition member being at least partially exposed at the opening, and the exposed portion being used to connect to the leakage current trip unit.

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