An electric leakage protector

Abstract

The embodiment of the utility model provides a kind of leakage protection circuit breaker, it is related to low-voltage electrical apparatus technical field.The utility model provides the leakage protection circuit breaker including shell and operating handle and plug-in terminal distributed in the both ends of shell along first direction, it also includes the circuit breaker body, leakage detection mutual inductor, leakage execution module and control circuit board being set in shell, first cavity and second cavity are divided in shell along second direction, leakage execution module and control circuit board are located in first cavity, circuit breaker body is set in second cavity, leakage detection mutual inductor is penetrated in first cavity and second cavity;First direction and second direction are perpendicular.The utility model can reduce the length size of leakage protection circuit breaker, effectively reduce the overall volume of circuit breaker body, so that the leakage circuit breaker protection device provided by the utility model is compact in structure, and the volume is smaller, and good installation and use effect can be realized in small space.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and more specifically, to a leakage current protection circuit breaker. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and opening current under normal circuit conditions, and capable of closing, carrying, and opening current under abnormal circuit conditions within a specified time. When faults such as leakage, overload, or circuit breakers occur in a power system, a circuit breaker can quickly disconnect the faulty component in the power system or cut off the entire power supply to prevent the fault from escalating and causing significant economic losses and casualties.

[0003] Current residual current circuit breakers are generally quite large, which limits their applicability, especially for installation in small spaces. Utility Model Content

[0004] The purpose of this utility model is to provide a residual current circuit breaker that has the advantages of small size, compact structure and wide applicability.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] In a first aspect, this utility model provides a residual current circuit breaker, including a housing and an operating handle and plug-in terminals distributed at both ends of the housing along a first direction. The residual current circuit breaker is plugged into a chassis via the plug-in terminals, and further includes:

[0007] The circuit breaker body, leakage current detection transformer, leakage current execution module and control circuit board are installed inside the housing;

[0008] The outer casing is divided into a first cavity and a second cavity along the second direction. The leakage current execution module and the control circuit board are located in the first cavity, the circuit breaker body is disposed in the second cavity, and the leakage current detection transformer is disposed through the first cavity and the second cavity.

[0009] The first direction is perpendicular to the second direction.

[0010] In an optional embodiment, the plug-in terminal includes an input terminal and an output terminal, the input terminal and the output terminal being located at the same end of the housing, and the leakage current detection transformer being located at the end of the housing near the operating handle.

[0011] In an optional embodiment, the housing includes a first upper housing, a first lower housing, and a middle cover. The first upper housing and the middle cover together form the second cavity, and the first lower housing and the middle cover together form the first cavity. The leakage current detection transformer passes through the middle cover.

[0012] In an optional embodiment, the outer shell includes a second upper shell, a second lower shell, a third upper shell, and a third lower shell. The second upper shell and the second lower shell together form the first cavity, and the third upper shell and the third lower shell together form the second cavity. The second lower shell and the third upper shell are spliced ​​together.

[0013] The leakage current detection transformer passes through the second lower housing and the third upper housing.

[0014] In an optional embodiment, the second cavity includes at least two independent chambers, and the circuit breaker body is disposed in each of the multiple chambers, with the leakage current detection transformer passing through the multiple chambers simultaneously.

[0015] In an optional embodiment, one end of the housing is provided with a leakage current regulating component and a leakage delay time regulating component, both of which are electrically connected to the control circuit board.

[0016] In an optional implementation, the leakage current actuation module includes a trip unit and a tripping mechanism. The control circuit board is electrically connected to the leakage current detection transformer and the trip unit, respectively, and the trip unit is drive-connected to the tripping mechanism.

[0017] In an optional embodiment, the tripping mechanism includes a rotating member and a tripping shaft. The rotating member has a driving part and an actuating part connected at a preset angle. The driving part abuts against the tripping device. One end of the tripping shaft abuts against the actuating part, and the other end of the tripping shaft extends into the second cavity and is connected to the circuit breaker body.

[0018] When the trip unit drives the rotating component to rotate, the actuating part drives the trip shaft to move, thereby driving the circuit breaker body to trip.

[0019] In an optional embodiment, the leakage current execution module further includes a leakage current indication mechanism, which is tractively connected to the rotating component to indicate the leakage current status when the circuit breaker body trips due to leakage current.

[0020] In an optional embodiment, the leakage current indicating mechanism includes a transmission rod, a first elastic element, and a limiting part, wherein the transmission rod is slidably disposed within the first cavity;

[0021] The transmission rod has a mounting groove for accommodating the first elastic element, and one end of the transmission rod is provided with an indicator button. The transmission rod can move under the action of the first elastic element so that the indicator button extends outside the housing.

[0022] The limiting part and the indicator button are respectively disposed at both ends of the transmission rod, and the end of the actuating part away from the driving part is provided with a supporting part; there is a snap-fit ​​groove between the limiting part and the transmission rod for accommodating the supporting part, and there is a supporting groove between the supporting part and the actuating part for accommodating the limiting part, so that the supporting part and the limiting part can be engaged with each other;

[0023] When the trip unit is activated, the rotating member rotates until the abutment and the limiting part are disengaged, and the indicated button moves outside the housing under the action of the first elastic member.

[0024] In an optional embodiment, the limiting part has a limiting surface and the abutting part has an abutting surface. When the indicator button moves outside the housing, the limiting surface abuts against the abutting surface, locking the trip shaft in the open state.

[0025] In an optional implementation, the leakage current execution module further includes a leakage current simulation mechanism, which is electrically connected to the leakage current detection transformer and the control circuit board to detect whether the leakage current protection circuit breaker can operate normally.

[0026] In an optional embodiment, the leakage current simulation mechanism includes a leakage current simulation button, a second elastic element, a first contact, and a second contact.

[0027] The leakage current simulation button is slidably disposed in the first cavity, and the second elastic element is sleeved outside the leakage current simulation.

[0028] The first contact abuts against the leakage current simulation button; when the circuit breaker body is closed, the leakage current simulation button can be driven to move toward the first cavity so that the first contact and the second contact are connected.

[0029] When the first contact and the second contact are connected, the control circuit board can drive the circuit breaker body to trip through the leakage current execution module.

[0030] The beneficial effects of the leakage current protection circuit breaker provided in this embodiment of the utility model include:

[0031] The residual current circuit breaker provided by this utility model has a housing divided into a first cavity and a second cavity along a second direction. The residual current actuator module and control circuit board are located in the first cavity, while the circuit breaker body is housed in the second cavity. A residual current detection transformer passes through both the first and second cavities. By placing the residual current actuator module in the first cavity, compared to the spatial layout of multiple components arranged along the length of a traditional circuit breaker, this application can reduce the length of the residual current circuit breaker and effectively reduce the overall volume of the circuit breaker body. This makes the residual current circuit breaker provided by this utility model compact in structure and small in size, achieving good installation and use even in small spaces. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A schematic diagram of the structure of the leakage current protection circuit breaker provided in the embodiment of this utility model;

[0034] Figure 2 A cross-sectional view of a residual current circuit breaker provided in an embodiment of this utility model;

[0035] Figure 3 This is a schematic diagram of the structure of a residual current circuit breaker provided in some optional embodiments of the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of a residual current circuit breaker provided in some alternative embodiments of the present invention;

[0037] Figure 5 This is a schematic diagram of the internal structure of the second cavity provided in an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of the internal structure of the first cavity of the leakage current protection circuit breaker when it is closed in an embodiment of this utility model;

[0039] Figure 7 This is a schematic diagram of the internal structure of the first cavity when the leakage current protection circuit breaker trips in this embodiment of the present invention;

[0040] Figure 8 This is a structural schematic diagram of the rotating component from a first-view perspective, provided in an embodiment of the present utility model.

[0041] Figure 9 This is a structural schematic diagram of the rotating component from a second perspective, provided in an embodiment of the present utility model.

[0042] Figure 10 A first-view structural schematic diagram of the leakage current indicator mechanism provided in an embodiment of this utility model;

[0043] Figure 11 This is a structural schematic diagram of the leakage current indication mechanism provided in an embodiment of the present utility model from a second perspective.

[0044] Icons: 100-Outer casing; 101-Operating handle; 102-Plug-in terminal; 103-First upper casing; 104-First lower casing; 105-Middle cover; 106-Second upper casing; 107-Second lower casing; 108-Third upper casing; 109-Third lower casing; 110-First cavity; 120-Second cavity; 200-Circuit breaker body; 300-Leakage current detection transformer; 400-Leakage current actuation module; 410-Trip unit; 420-Trip mechanism; 421-Rotating component; 4211-Drive unit; 4212-Actuating unit; 4413- Supporting part; 4414-Supporting groove; 4415-Supporting surface; 422-Trigger shaft; 423-Reset component; 440-Leakage current indicating mechanism; 4411-First elastic component; 4412-Mounting groove; 442-Transmission rod; 443-Indicator button; 444-Limiting part; 445-Snap-fit ​​groove; 446-Limiting surface; 500-Control circuit board; 610-Leakage current adjusting component; 620-Leakage current delay time adjusting component; 700-Leakage current simulation mechanism; 710-Leakage current simulation button; 720-Second elastic component; 730-First contact; 740-Second contact. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0047] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0048] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model 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 utility model.

[0049] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0050] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0051] Residual current circuit breakers (RCCBs) are core electrical safety devices, widely used in residential buildings, public facilities, and industrial manufacturing. They are used to detect leakage current in circuits and quickly cut off power when leakage occurs, preventing significant economic losses and personal injury. However, in current RCCBs, the circuit breaker body, leakage current detection transformer, and leakage current actuator are generally housed inside the casing along the length of the circuit breaker. This results in a long and bulky overall RCCB, making it unsuitable for installation in confined spaces and limiting its applicability.

[0052] To address the issue of current circuit breakers having a large overall size, which limits their applicability, the following detailed description, through embodiments and accompanying drawings, details the overall structure, working principle, and technical effects of the residual current circuit breaker provided by this invention.

[0053] Please refer to Figures 1-11 This utility model provides a leakage current protection circuit breaker, which is a core device for electrical safety. It is used to detect leakage current in the circuit and quickly cut off the power supply when leakage occurs, thereby effectively preventing electric shock and electrical fire.

[0054] This utility model provides a residual current circuit breaker, which includes a housing 100, and an operating handle 101 and a plug-in terminal 102 distributed at both ends of the housing 100 along a first direction a. The residual current circuit breaker is plugged into the chassis via the plug-in terminal 102, and the operating handle 101 is used to control the tripping and opening of the residual current circuit breaker. Furthermore, a locking mechanism connected to the operating handle 101 is provided on the housing 100 to fix the operating handle 101 and lock the residual current circuit breaker in the tripped state. The specific structural form of the locking mechanism is not limited in this embodiment.

[0055] Furthermore, the residual current circuit breaker provided by this utility model also includes a circuit breaker body 200, a residual current detection transformer 300, a residual current actuation module 400, and a control circuit board 500. The housing 100 is divided into a first cavity 110 and a second cavity 120 along the second direction b. The residual current actuation module 400 and the control circuit board 500 are located in the first cavity 110, and the circuit breaker body 200 is located in the second cavity 120. Figure 2 As shown, the leakage current detection transformer 300 is located inside the housing 100, and the leakage current detection transformer 300 extends through the first cavity 110 and the second cavity 120 along the second direction b. The control circuit board 500 is electrically connected to both the leakage current detection transformer 300 and the leakage current execution module 400. In this embodiment, the second direction b is perpendicular to the first direction a, and the first direction a is the length direction of the housing 100, while the second direction b is the width direction of the housing 100.

[0056] By dividing the interior of the housing 100 into a first cavity 110 and a second cavity 120 along the second direction b, and placing the leakage current actuation module 400 and control circuit board 500 in the first cavity 110, the circuit breaker body 200 in the second cavity 120, and the leakage current detection transformer 300 through both the first cavity 110 and the second cavity 120, this application reduces the length of the circuit breaker compared to the spatial layout of multiple components arranged along the length of the housing in traditional circuit breakers, effectively reducing the overall volume of the circuit breaker body 200. This results in a compact and small-sized leakage current circuit breaker, enabling good installation and use even in small spaces.

[0057] The residual current circuit breaker provided by this utility model can be a single-pole residual current circuit breaker (1P) or a multi-pole residual current circuit breaker (2P / 3P / 4P). Please refer to... Figure 3 In some optional embodiments, when the residual current circuit breaker is a single-pole (IP) residual current circuit breaker, the housing 100 includes a first upper housing 103, a first lower housing 104, and a middle cover 105. The first upper housing 103 and the middle cover 105 together form a second cavity 120, and the first lower housing 104 and the middle cover 105 together form a first cavity 110. The middle cover 105 serves as the common cavity wall of the first cavity 110 and the second cavity 120, thereby dividing the housing 100 into the first cavity 110 and the second cavity 120, while preventing interference between the components located in the first cavity 110 and the second cavity 120. It is understood that in this embodiment, a receiving hole for accommodating the leakage current detection transformer 300 is provided on the middle cover 105. The two sides of the leakage current detection transformer 300 extend into the first cavity 110 and the second cavity 120 respectively through the receiving hole, so as to achieve the effect of the leakage current detection transformer 300 penetrating through the first cavity 110 and the second cavity 120.

[0058] Please refer to Figure 4 In some alternative embodiments, when the residual current circuit breaker is a multi-pole residual current circuit breaker (2P / 3P / 4P), the housing 100 includes a second upper housing 106, a second lower housing 107, a third upper housing 108, and a third lower housing 109. The second upper housing 106 and the second lower housing 107 together form a first cavity 110, and the third upper housing 108 and the third lower housing 109 together form a second cavity 120. To form a complete circuit breaker structure, the second lower housing 107 and the third upper housing 108 are detachable and can be joined together. It is understood that in this embodiment, the second lower housing 107 and the third upper housing 108 have corresponding receiving holes for accommodating a residual current detection transformer 300. These receiving holes connect the first cavity 110 and the second cavity 120, allowing the residual current detection transformer 300 to pass through and be disposed within the first cavity 110 and the second cavity 120.

[0059] Please refer to Figure 5 The plug-in terminal 102 includes input terminals and output terminals, wherein the input terminals and output terminals are located at the same end of the housing 100, and the leakage current detection transformer 300 is located at the end of the second cavity 120 near the operating handle 101. Both the input and output terminals are located at the end furthest from the operating handle 101, i.e., a rear-in, rear-out wiring method is adopted. Compared with the traditional front-in, rear-out wiring method of leakage current circuit breakers, the detection circuit does not need to input or output from the operating handle 101 end. Therefore, the leakage current detection transformer 300 can be installed as close as possible to the operating handle 101, making the overall structure of the leakage current circuit breaker more compact and expanding its application range.

[0060] For further details, please refer to Figure 1 and Figure 4 In some alternative embodiments provided by this utility model, when the residual current circuit breaker is a multi-stage residual current circuit breaker (2P / 3P / 4P), the second cavity 120 includes at least two independent chambers, and each of the multiple chambers is equipped with a circuit breaker body 200. A residual current detection transformer 300 simultaneously passes through multiple chambers, thereby facilitating the passage of multiple live wires connected to multiple circuit breaker bodies 200 through the residual current detection transformer 300. This achieves the multi-stage residual current protection function of the residual current circuit breaker and expands its applicability.

[0061] Please refer to 6 and Figure 7In this embodiment, the leakage current execution module 400 includes a trip unit 410 and a tripping mechanism 420. The control circuit board 500 is electrically connected to the leakage current detection transformer 300 and the trip unit 410, respectively. The trip unit 410 and the tripping mechanism 420 are drive-connected. The conductive circuit connected to the circuit breaker body 200 passes through the leakage current detection transformer 300. The leakage current detection transformer 300 is used to detect the leakage current signal of the circuit breaker body 200. The control circuit board 500 activates the trip unit 410 according to the leakage current signal, so that the trip unit 410 drives the circuit breaker body 200 to open through the tripping mechanism 420, thereby realizing the leakage current protection function.

[0062] Specifically, the control circuit board 500 determines whether the circuit breaker body 200 is in a leakage fault state based on the conductive circuit current signal detected by the leakage current detection transformer 300. This can be achieved by comparing the leakage current value corresponding to the current signal detected by the leakage current detection transformer 300 with a leakage current threshold. Specifically, if the leakage current value is greater than or equal to the leakage current threshold, the circuit breaker body 200 is determined to be in a leakage fault state; otherwise, it is considered to be in a non-leakage fault state.

[0063] For details, please refer to Figures 5-6 The tripping mechanism 420 includes a rotating member 421 and a tripping shaft 422, which are combined Figure 8 and Figure 9 The rotating member 421 has a driving part 4211 and an actuating part 4212 connected at a preset angle. In this embodiment, the driving part 4211 and the actuating part 4212 are set at an obtuse angle and together form a bent plate structure. The rotation center of the rotating member 421 is located at the connection position of the driving part 4211 and the actuating part 4212, and the driving part 4211 abuts against the iron core of the trip unit 410. One end of the trip shaft 422 abuts against the actuating part 4212, and the other end of the trip shaft 422 extends into the second cavity 120 and is connected to the circuit breaker body 200. When the leakage current detection transformer 300 detects leakage current and activates the trip unit 410 through the control circuit board 500, the rotating member 421 is driven to rotate by the trip unit 410, the actuating part 4212 rotates and drives the trip shaft 422 to move, thereby driving the circuit breaker body 200 to trip.

[0064] Furthermore, referring to Figure 6 and Figure 7 A reset member 423 is also provided at the rotation center of the rotating member 421. The reset member 423 makes the rotating member 421 always tend to rotate back to the initial state. When the trip shaft 422 abuts against the action part 4212 located in the initial state of the rotating member 421, the circuit breaker body 200 is in the closed state.

[0065] In the initial state, the trip shaft 422 is in the closed position, the residual current circuit breaker is in the closed state, and the actuating part 4212 of the rotating part 421 abuts against the trip shaft 422 but does not apply external force to the trip shaft 422. When the circuit breaker body 200 is in a residual current fault state, when the control circuit board 500 controls the trip unit 410 to start, the trip coil in the trip unit 410 generates a magnetic field, driving the iron core to extend out of the trip unit 410. The iron core abuts against the driving part 4211 and drives the driving part 4211 to move, thereby driving the rotating part 421 to rotate around the rotation center, so that the actuating part 4212 moves the trip shaft 422 to the open state, realizing the opening of the circuit breaker body 200.

[0066] Understandably, oblong holes are provided on the middle cover 105, the second lower housing 107, and the third upper housing 108. These oblong holes penetrate the first cavity 110 and the second cavity 120, and both ends of the trip shaft 422 extend into the first cavity 110 and the second cavity 120 respectively through the oblong holes. When the rotating component 421 rotates, the actuating part 4212 can drive the trip shaft 422 to move along the oblong hole, ensuring that the trip shaft 422 can move under the action of the actuating part 4212, thereby driving the circuit breaker body 200 to trip.

[0067] Please refer to Figure 6 and Figure 7 To further expand the applicability of the residual current circuit breaker, in this embodiment, a leakage current regulating component 610 and a leakage delay time regulating component 620 are also provided at one end of the housing 100. Both the leakage current regulating component 610 and the leakage delay time regulating component 620 are electrically connected to the control circuit board 500. The leakage current regulating component 610 and the leakage delay time regulating component 620 are used to adjust the set leakage current and leakage delay time of the residual current circuit breaker to meet the usage requirements of the residual current circuit breaker under different operating conditions.

[0068] Please refer to Figure 6 and Figure 7 The leakage current execution module 400 also includes a leakage current indicating mechanism 440, which is connected to the rotating component 421 for transmission. It is used to indicate the leakage current status when the circuit breaker body 200 trips due to leakage current, facilitating the operator's monitoring of the circuit status. In conjunction with... Figure 9 and Figure 10 The leakage current indicator mechanism 440 includes a transmission rod 442 and a first elastic member 4411. The transmission rod 442 is slidably disposed in the first cavity 110 along the first direction a. One end of the transmission rod 442 is provided with an indicator button 443, and the indicator button 443 end of the transmission rod 442 can extend outside the outer shell 100 so that the operator can press it.

[0069] A mounting groove 4412 is provided in the portion of the transmission rod 442 located inside the housing 100, and a first elastic member 4411 is disposed in the mounting groove 4412. The first elastic member 4411 causes the transmission rod 442 to always have a tendency to slide along the first direction a and cause one end of the indicator button 443 to extend beyond the housing 100.

[0070] To enable the transmission rod 442 to move in conjunction with the rotating component 421, so that when the trip unit 410 is activated, the rotating component 421 controls the transmission rod 442 to move out of the housing 100, thereby causing the indicator button 443 to move out of the housing 100 to indicate leakage current. Based on this, please refer to... Figures 7-10 In some optional embodiments, the leakage current indicating mechanism 440 further includes a limiting part 444, which is located at the end of the transmission rod 442 away from the indicating button 443, while the actuating part 4212 is provided with a supporting part 4413 at the end near the transmission rod 442. The supporting part 4413 and the limiting part 444 cooperate with each other, and there is a snap-fit ​​groove 445 between the limiting part 444 and the transmission rod 442 for receiving the supporting part 4413, and there is a supporting groove 4414 between the supporting part 4413 and the actuating part 4212 for receiving the limiting part 444. Thus, when the indicating button 443 on the transmission rod 442 is pressed into the housing 100, the rotating member 421, under the action of the resetting member 423, rotates the supporting part 4413 to be located in the snap-fit ​​groove 445 and the limiting part 444 to be located in the supporting groove 4414, and the supporting part 4413 and the limiting part 444 are engaged with each other (e.g., Figure 5 (as shown in the figure) to achieve a fixed limit on the transmission rod 442.

[0071] In some preferred embodiments, please refer to Figures 8-11 One end of the limiting part 444 also has a limiting surface 446, and one side of the abutting part 4413 has an abutting surface 4415. When the trip unit 410 is activated, the rotating member 421 rotates until the abutting part 4413 and the limiting part 444 are disengaged. At this time, the transmission rod 442, under the action of the first elastic member 4411, moves the indicator button 443 outside the housing 100. At this time, the limiting surface 446 abuts against the abutting surface 4415 (e.g., Figure 6In the indicated state, the rotating member 421 is held in its current position by the transmission rod 442. At this time, the actuating part 4212 abuts against the trip shaft 422, thereby locking the circuit breaker body 200 in the open state. Furthermore, the circuit breaker body 200 is not allowed to close until the leakage fault is cleared. When the leakage fault is cleared, the trip unit 410 releases the drive of the rotating member 421. The operator presses the indicator button 443 and pushes it into the housing. The transmission rod 442 moves to engage with the supporting part 4413 and the limiting part 444. Under the action of the first elastic member 4411, the supporting part 4413 and the limiting part 444 are locked together, preventing the transmission rod 442 from resetting under the action of the first elastic member 4411. In this state, the actuating part 4212 releases the restriction on the trip shaft 422, allowing the circuit breaker body 200 to close smoothly.

[0072] In this embodiment, on one hand, the indicator button 443, as part of the transmission rod 442, is used by the operator to press it to achieve the closing and resetting of the circuit breaker body 200. On the other hand, the indicator button 443 can also serve as a leakage current indication indicator. When the indicator button 443 moves outside the housing 100, it indicates that a leakage current fault has occurred in the circuit breaker body 200 and the circuit breaker body 200 is in the open state. In some alternative embodiments, any one or more combinations of text, color, voice, light, or alarm can be used to achieve the function of indicating leakage current.

[0073] In some alternative embodiments, please refer to Figure 6 and Figure 7 The leakage current execution module 400 also includes a leakage current simulation mechanism 700, which is electrically connected to the leakage current detection transformer 300 to detect whether the leakage current protection circuit breaker can operate normally. Specifically, the leakage current simulation mechanism 700 includes a leakage current simulation button 710, a second elastic element 720, a first contact 730, and a second contact 740. The leakage current simulation button 710 is slidably mounted in the first cavity 110 along a first direction a, and the leakage current simulation button 710 can be driven to move outside the housing 100. The second elastic element 720 is connected to the leakage current simulation button 710, and the second elastic element 720 makes the leakage current simulation button 710 always have a tendency to move towards the outside of the housing 100. The first contact 730 is connected to the leakage current simulation button 710, and the second contact 740 is located in the first cavity 110, with the first contact 730 located between the second contact 740 and the leakage current simulation button 710.

[0074] When the circuit breaker body 200 is in the closed state, the leakage current simulation button 710 can be driven to move into the first cavity 110 under the action of external force, so that the first contact 730 and the second contact 740 are connected; in the state where the first contact 730 and the second contact 740 are connected, the control circuit board 500 can drive the trip unit 410 to trip. Thus, by pressing the leakage current simulation button 710, the first contact 730 and the second contact 740 are connected, thereby performing a leakage current simulation test on the leakage current protection circuit breaker. After the external force on the leakage current simulation button 710 is released, the leakage current simulation button 710 moves out of the housing 100 under the action of the second elastic member 720, so that the first contact 730 and the second contact 740 are disengaged, and the leakage current simulation button 710 is partially located outside the housing 100, making it convenient for the operator to press the leakage current simulation button 710 again to perform leakage current simulation.

[0075] It is understandable that, in order to facilitate the compact structure of the residual current circuit breaker and to make it easier to operate, in this embodiment, the leakage current adjustment component 610, the leakage delay time adjustment component 620, the indicator button 443 and the leakage simulation button 710 are all located at the end of the housing 100 near the operating handle 101.

[0076] In summary, the working principle of the residual current circuit breaker provided by this utility model is as follows:

[0077] In the initial state: the leakage current protection circuit breaker is in normal working state (i.e. no leakage fault has occurred). At this time, the trip shaft 422 is in the closed position, the trip unit 410 is in the closed state, the holding part 4413 and the limiting part 444 are engaged with each other, the indicator button 443 is located in the first cavity 110, and the first elastic element 4411 is in the energy storage state.

[0078] When a leakage current fault occurs: the leakage current detection transformer 300 detects the leakage current signal and transmits it to the control circuit board 500. The control circuit board 500 controls the trip unit 410 to start, and the trip unit 410 drives the rotating part 421 to rotate, thereby moving the trip shaft 422 to the open state through the actuating part 4212, and the circuit breaker body 200 is opened. At the same time, the supporting part 4413 and the limiting part 444 are released from engagement, and the indicator button 443 moves outside the housing 100 under the action of the first elastic member 4411 to serve as a leakage current indicator. Furthermore, at this time, the limiting surface 446 on the limiting part 444 abuts against the supporting surface 4415 on the supporting part 4413, locking the trip shaft 422 in the open state, and the circuit breaker body 200 cannot be closed.

[0079] In the reset state: After the leakage fault is cleared, press the indicator button 443 towards the first cavity 110. The first elastic element 4411 stores energy, and the limiting surface 446 on the limiting part 444 and the supporting surface 4415 on the supporting part 4413 disengage from the supporting state. At this time, the circuit breaker body 200 is driven to close, the trip shaft 422 moves to the closed state, the leakage protection circuit breaker closes, and the rotating part 421 rotates under the action of the reset part 423 until the supporting part 4413 and the limiting part 444 are engaged again.

[0080] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A residual current circuit breaker, characterized in that, Includes a housing (100) and operating handles (101) and plug-in terminals (102) distributed at both ends of the housing (100) along a first direction. The residual current circuit breaker is plugged into the chassis through the plug-in terminals (102). It also includes: The circuit breaker body (200), leakage current detection transformer (300), leakage current execution module (400) and control circuit board (500) are disposed in the housing (100); The outer casing (100) is divided into a first cavity (110) and a second cavity (120) along a second direction. The leakage current execution module (400) and the control circuit board (500) are located in the first cavity (110). The circuit breaker body (200) is disposed in the second cavity (120). The leakage current detection transformer (300) is disposed through the first cavity (110) and the second cavity (120). The first direction is perpendicular to the second direction.

2. The residual current circuit breaker according to claim 1, characterized in that, The plug-in terminal (102) includes an input terminal and an output terminal, the input terminal and the output terminal are located at the same end of the housing (100), and the leakage current detection transformer (300) is located at the end of the housing (100) near the operating handle (101).

3. The residual current circuit breaker according to claim 1, characterized in that, The outer casing (100) includes a first upper casing (103), a first lower casing (104), and a middle cover (105). The first upper casing (103) and the middle cover (105) together form the second cavity (120), and the first lower casing (104) and the middle cover (105) together form the first cavity (110). The leakage current detection transformer (300) passes through the middle cover (105).

4. The residual current circuit breaker according to claim 1, characterized in that, The outer shell (100) includes a second upper shell (106), a second lower shell (107), a third upper shell (108), and a third lower shell (109). The second upper shell (106) and the second lower shell (107) together form the first cavity (110), and the third upper shell (108) and the third lower shell (109) together form the second cavity (120). The second lower shell (107) and the third upper shell (108) are spliced ​​together. The leakage current detection transformer (300) passes through the second lower housing (107) and the third upper housing (108).

5. The residual current circuit breaker according to claim 1, characterized in that, The second cavity (120) includes at least two independent chambers, and the circuit breaker body (200) is provided in each of the multiple chambers. The leakage current detection transformer (300) passes through the multiple chambers simultaneously.

6. The residual current circuit breaker according to claim 1, characterized in that, One end of the housing (100) is provided with a leakage current regulating component (610) and a leakage delay time regulating component (620), both of which are electrically connected to the control circuit board (500).

7. The residual current circuit breaker according to any one of claims 1-6, characterized in that, The leakage current execution module (400) includes a trip unit (410) and a tripping mechanism (420). The control circuit board (500) is electrically connected to the leakage current detection transformer (300) and the trip unit (410) respectively. The trip unit (410) is drive-connected to the tripping mechanism (420).

8. The residual current circuit breaker according to claim 7, characterized in that, The tripping mechanism (420) includes a rotating member (421) and a tripping shaft (422). The rotating member (421) has a driving part (4211) and an actuating part (4212) connected at a preset angle. The driving part (4211) abuts against the trip unit (410). One end of the tripping shaft (422) abuts against the actuating part (4212), and the other end of the tripping shaft (422) extends into the second cavity (120) and is connected to the circuit breaker body (200). When the trip unit (410) drives the rotating member (421) to rotate, the actuating part (4212) drives the trip shaft (422) to move, thereby driving the circuit breaker body (200) to open.

9. The residual current circuit breaker according to claim 8, characterized in that, The leakage current execution module (400) further includes a leakage current indication mechanism (440), which is tractively connected to the rotating member (421) to indicate the leakage current status when the circuit breaker body (200) trips due to leakage current.

10. The residual current circuit breaker according to claim 9, characterized in that, The leakage current indicating mechanism (440) includes a transmission rod (442), a first elastic element (4411) and a limiting part (444), wherein the transmission rod (442) is slidably disposed in the first cavity (110); The transmission rod (442) is provided with a mounting groove (4412) for accommodating the first elastic element (4411). One end of the transmission rod (442) is provided with an indicator button (443). The transmission rod (442) can move under the action of the first elastic element (4411) so that the indicator button (443) extends to the outside of the housing (100). The limiting part (444) and the indicating button (443) are respectively disposed at both ends of the transmission rod (442). The end of the actuating part (4212) away from the driving part (4211) is provided with a supporting part (4413). There is a snap-fit ​​groove (445) between the limiting part (444) and the transmission rod (442) for accommodating the supporting part (4413). There is a supporting groove (4414) between the supporting part (4413) and the actuating part (4212) for accommodating the limiting part (444), so that the supporting part (4413) and the limiting part (444) can be engaged with each other. When the trip unit (410) is activated, the rotating member (421) rotates until the abutment part (4413) and the limiting part (444) are released from the engagement state, and the indicated button (443) moves outside the housing (100) under the action of the first elastic member (4411).

11. The residual current circuit breaker according to claim 10, characterized in that, The limiting part (444) has a limiting surface (446), and the supporting part (4413) has a supporting surface (4415). When the indicator button (443) moves outside the housing (100), the limiting surface (446) abuts against the supporting surface (4415) to lock the trip shaft (422) in the open state.

12. The residual current circuit breaker according to claim 1, characterized in that, The leakage current execution module (400) also includes a leakage current simulation mechanism (700), which is electrically connected to the leakage current detection transformer (300) and the control circuit board (500) to detect whether the leakage current protection circuit breaker can operate normally.

13. The residual current circuit breaker according to claim 12, characterized in that, The leakage current simulation mechanism (700) includes a leakage current simulation button (710), a second elastic element (720), a first contact (730) and a second contact (740); The leakage current simulation button (710) is slidably disposed in the first cavity (110), and the second elastic element (720) is connected to the leakage current simulation button (710); The first contact (730) abuts against the leakage current simulation button (710); when the circuit breaker body (200) is closed, the leakage current simulation button (710) can move toward the first cavity (110) under the action of external force so that the first contact (730) and the second contact (740) are connected. When the first contact (730) and the second contact (740) are connected, the control circuit board (500) can drive the circuit breaker body (200) to open through the leakage current execution module (400).

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