circuit breaker

Abstract

The application relates to a circuit breaker, belonging to the technical field of low-voltage electrical appliances. The circuit breaker comprises a rectangular shell and a zero-sequence current transformer, a release, a circuit board and an operating mechanism arranged in the shell respectively, the circuit board is electrically connected with the zero-sequence current transformer and the release respectively, and the release is in transmission connection with the operating mechanism; the zero-sequence current transformer is used for detecting a leakage current signal of the circuit breaker, the circuit board drives the release to release according to the leakage current signal, so that the release drives the circuit breaker to open through the operating mechanism.

Description

TECHNICAL FIELD

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

[0002] The circuit breaker refers to a switching device capable of closing, carrying and opening the current under normal circuit conditions and capable of closing, carrying and opening the current under abnormal circuit conditions within a specified time. When a fault such as leakage, overload or short circuit occurs in the system, the circuit breaker can quickly cut off the fault mechanism in the system or cut off the entire power supply to prevent the fault from expanding and avoid causing huge economic losses and casualties.

[0003] However, the existing leakage protection type circuit breaker has a leakage function module and a circuit breaker basic module arranged in parallel, and has many parts and a relatively loose structure, which leads to a large size of the circuit breaker. This results in low space utilization when the circuit breaker is installed in a standardized cabinet, which is difficult to meet the development needs of the miniaturization market. SUMMARY

[0004] The purpose of the present application is to provide a circuit breaker with small size and compact structure.

[0005] The embodiment of the present application is implemented as follows:

[0006] In one aspect of the present application, a circuit breaker is provided, which includes a rectangular shell and a zero sequence current transformer, a trip unit, a circuit board and an operating mechanism arranged in the shell respectively. The circuit board is electrically connected with the zero sequence current transformer and the trip unit respectively, and the trip unit is in transmission connection with the operating mechanism. The zero sequence current transformer is used to detect a leakage current signal of the circuit breaker, and the circuit board drives the trip unit to trip according to the leakage current signal, so that the trip unit drives the circuit breaker to open through the operating mechanism.

[0007] Optionally, the zero sequence current transformer and the trip unit are arranged along the length direction of the shell, and the circuit board and the transformer are arranged along the width direction of the shell.

[0008] Optionally, the circuit board and the operating mechanism are arranged along the length direction of the shell.

[0009] Optionally, the circuit board is provided with a first contact and a second contact, and the circuit breaker further includes a leakage test mechanism arranged in the shell. The leakage test mechanism includes a first elastic member having one end in communication with the first contact. When the circuit breaker is in a closed state, the other end of the first elastic member can be driven to communicate with the second contact. In the state that the two ends of the first elastic member are in communication with the first contact and the second contact respectively, the circuit board can drive the trip unit to trip.

[0010] Optionally, the electric leakage testing mechanism further comprises a testing button arranged on the shell and in transmission connection with the first elastic member, the testing button comprising a body slidingly connected to the shell and an acting portion arranged on the body, the other end of the first elastic member being capable of being in contact with the second contact under the driving action of the acting portion.

[0011] Optionally, the testing button and the operating handle of the circuit breaker are arranged along the width direction of the shell.

[0012] Optionally, the testing button further comprises a pressing portion arranged on the body, the pressing portion and the acting portion being arranged at opposite ends of the body, and the pressing portion being exposed outside the shell.

[0013] Optionally, the testing button further comprises an anti-dropping portion extending from one end of the acting portion towards a direction away from the body, the anti-dropping portion and the acting portion enclosing an acting cavity, and the end of the first elastic member for contacting the second contact being limited in the acting cavity.

[0014] Optionally, the circuit breaker further comprises an electric leakage indicating member arranged on the shell, the electric leakage indicating member being used for indicating the electric leakage state when the circuit breaker has an electric leakage fault.

[0015] Optionally, one side of the operating handle of the circuit breaker is recessed with a receiving groove, and the electric leakage indicating member is received in the receiving groove.

[0016] Optionally, the first elastic member is a torsion spring.

[0017] Optionally, the trip unit is a transient and electric leakage integrated trip unit.

[0018] The beneficial effects of the present application include:

[0019] The circuit breaker provided by the present application comprises a shell in the shape of a rectangle and a zero sequence current transformer, a trip unit, a circuit board and an operating mechanism arranged in the shell respectively, the circuit board is electrically connected with the zero sequence current transformer and the trip unit respectively, and the trip unit is in transmission connection with the operating mechanism; the zero sequence current transformer is used for detecting an electric leakage current signal of the circuit breaker, and the circuit board drives the trip unit to trip according to the electric leakage current signal, so that the trip unit drives the circuit breaker to open through the operating mechanism. In this way, when the circuit breaker has an electric leakage fault, the zero sequence current transformer will detect the electric leakage current signal, and then send the electric leakage current signal to the circuit board, the circuit board will send an instruction to the trip unit according to the electric leakage current signal, so as to drive the trip unit to trip, and the trip unit tripping will drive the operating mechanism to move, so that the operating mechanism drives the moving contact to move away from the static contact, and then the circuit breaker opens. The circuit breaker provided by the present application has a simple and compact structure, fewer components, and can realize the electric leakage protection function of the circuit breaker while reducing the overall volume of the circuit breaker, thereby being conducive to the installation of the circuit breaker in a standard cabinet, effectively improving the space utilization of the standard cabinet, and meeting the market development demand for miniaturization of the circuit breaker. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. Other related drawings can also be obtained by those of ordinary skill in the art without creative effort, based on these drawings.

[0021] Figure 1 One of the structural schematic diagrams of the circuit breaker provided by the embodiments of the present application;

[0022] Figure 2 The second structural schematic diagram of the circuit breaker provided by the embodiments of the present application;

[0023] Figure 3 The third structural schematic diagram of the circuit breaker provided by the embodiments of the present application;

[0024] Figure 4 The fourth structural schematic diagram of the circuit breaker provided by the embodiments of the present application;

[0025] Figure 5 The schematic diagram of the cooperation relationship between the leakage test mechanism and the circuit board provided by the embodiments of the present application;

[0026] Figure 6 The structural schematic diagram of the test button provided by the embodiments of the present application;

[0027] Figure 7 The first structural schematic diagram of the release provided by the embodiments of the present application;

[0028] Figure 8 The second structural schematic diagram of the release provided by the embodiments of the present application;

[0029] Figure 9A The first state schematic diagram of the leakage indicating member and the operating handle provided by the embodiments of the present application;

[0030] Figure 9B The second state schematic diagram of the leakage indicating member and the operating handle provided by the embodiments of the present application;

[0031] Figure 9C The third state schematic diagram of the leakage indicating member and the operating handle provided by the embodiments of the present application;

[0032] Figure 9D The fourth state schematic diagram of the leakage indicating member and the operating handle provided by the embodiments of the present application;

[0033] Figure 10A The first state schematic diagram of the leakage indicating member and the push block in the sliding slot provided by the embodiments of the present application;

[0034] Figure 10B Figure 2 is a schematic view of the state of the leakage indication member and the push block in the sliding groove provided by the embodiment of the present application;

[0035] Figure 10C Figure 3 is a schematic view of the state of the leakage indication member and the push block in the sliding groove provided by the embodiment of the present application.

[0036] Icon: 10 - housing; 11 - sliding groove; 20 - zero sequence current transformer; 30 - release; 31 - coil frame; 32 - leakage coil; 33 - main circuit coil; 34 - magnetic yoke; 35 - moving iron core; 36 - static iron core; 37 - reset spring; 38 - top rod; 40 - circuit board; 41 - first contact; 42 - second contact; 50 - operating mechanism; 60 - leakage test mechanism; 61 - first elastic member; 62 - test button; 621 - body; 622 - acting part; 623 - pressing part; 624 - anti-dropping part; 625 - acting cavity; 70 - leakage indication member; 71 - limiting member; 80 - operating handle; 81 - accommodating groove; 82 - clamping groove; 91 - push block; 92 - electroshrinkable member; 93 - second elastic member; 94 - third elastic member; a - length direction of the housing; b - width direction of the housing; c - height direction of the housing. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0039] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0040] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed during use, and are merely for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0041] In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0042] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] Please refer to Figures 1 to 4 The embodiment provides a circuit breaker, which comprises a rectangular shell 10 and a zero sequence current transformer 20, a trip unit 30, a circuit board 40 and an operating mechanism 50 arranged in the shell 10 respectively. The circuit board 40 is electrically connected with the zero sequence current transformer 20 and the trip unit 30 respectively, and the trip unit 30 is in transmission connection with the operating mechanism 50. The zero sequence current transformer 20 is used for detecting a leakage current signal of the circuit breaker, and the circuit board 40 drives the trip unit 30 to trip according to the leakage current signal, so that the trip unit 30 drives the circuit breaker to open through the operating mechanism 50.

[0044] The zero sequence current transformer 20, the trip unit 30, the circuit board 40 and the operating mechanism 50 are arranged in the rectangular shell 10 of the circuit breaker. Among them, the zero sequence current transformer 20 sends the detected leakage current signal of the circuit breaker to the circuit board 40 electrically connected therewith. Then, the circuit board 40 judges whether the circuit breaker is in a leakage fault state according to the leakage current signal, so as to drive the trip unit 30 to trip when the circuit breaker is in the leakage fault state, so that the ejector rod 38 of the trip unit 30 is ejected, and then the operating mechanism 50 of the circuit breaker is driven to move through the ejector rod 38 of the trip unit 30, so as to open the circuit breaker.

[0045] Wherein, the circuit board 40 judges whether the circuit breaker is in the electric leakage fault state according to the electric leakage current signal, which can be that the electric leakage current value corresponding to the electric leakage current signal detected by the zero sequence current transformer 20 is compared with the electric leakage current threshold value to determine whether it is in the electric leakage fault state. Specifically, when the electric leakage current value corresponding to the electric leakage current signal is greater than or equal to the electric leakage current threshold value, it is determined that the circuit breaker is in the electric leakage fault state; otherwise, it is in the non-electric leakage fault state.

[0046] In the embodiment, optionally, the above-mentioned tripping device 30 is a instantaneous and electric leakage integrated tripping device 30, and the instantaneous and electric leakage integrated tripping device 30 is fixed in the shell 10. In this way, the circuit breaker can realize the functions of instantaneous tripping and electric leakage tripping by using one tripping device 30.

[0047] For example, please refer to Figure 7 and Figure 8 , the tripping device 30 mainly includes a coil former 31, a magnetic yoke 34, a moving iron core 35, a static iron core 36, a top rod 38, a reset spring 37, a main circuit coil 33 and an electric leakage coil 32. Wherein, the coil former 31 is fixed on the magnetic yoke 34, the electric leakage coil 32 is wound on the outer periphery of the coil former 31, and the main circuit coil 33 is wound on the outer periphery of the electric leakage coil 32. The static iron core 36, the moving iron core 35, the reset spring 37 and the top rod 38 are respectively located in the cavity of the coil former 31, wherein the top rod 38 is slidingly connected in the cavity of the coil former 31, and the top rod 38 can slide up and down along the cavity of the coil former 31, the moving iron core 35 and the static iron core 36 are respectively sleeved on the outer periphery of the top rod 38, and the moving iron core 35 is located above the static iron core 36, the reset spring 37 is arranged between the moving iron core 35 and the static iron core 36, and the two ends of the reset spring 37 respectively abut against the moving iron core 35 and the static iron core 36, the moving iron core 35 is fixed relative to the top rod 38, and the static iron core 36 is fixed relative to the coil former 31.

[0048] In the initial state, the moving iron core 35 and the static iron core 36 are located in the cavity of the coil former 31, and the reset spring 37 is in the pre-pressing state, as shown in Figure 8 ; when the main circuit coil 33 or the electric leakage coil 32 generates a magnetic field of a certain size, the moving iron core 35 will move downward to the driving position due to the electromagnetic force overcoming the pressure of the reset spring 37, and drive the top rod 38 to move downward to extend out of the cavity of the coil former 31, as shown in Figure 7 ; when the magnetic field of the main circuit coil 33 or the electric leakage coil 32 disappears, the reset spring 37 releases energy, thereby driving the moving iron core 35 and the top rod 38 to reset, as shown in Figure 8 .

[0049] In summary, the circuit breaker provided in the application comprises a rectangular shell 10 and a zero-sequence current transformer 20, a trip unit 30, a circuit board 40 and an operating mechanism 50 arranged in the shell 10 respectively, the circuit board 40 is electrically connected with the zero-sequence current transformer 20 and the trip unit 30 respectively, and the trip unit 30 is in transmission connection with the operating mechanism 50; the zero-sequence current transformer 20 is used for detecting a leakage current signal of the circuit breaker, the circuit board 40 drives the trip unit 30 to trip according to the leakage current signal, so that the trip unit 30 drives the circuit breaker to open through the operating mechanism 50. In this way, when the circuit breaker has a leakage fault, the zero-sequence current transformer 20 will detect the leakage current signal, and then send the leakage current signal to the circuit board 40, the circuit board 40 will send an instruction to the trip unit 30 according to the leakage current signal, so as to drive the trip unit 30 to trip, and the trip unit 30 tripping will drive the operating mechanism 50 to move, so that the operating mechanism 50 drives the moving contact to move away from the static contact, and then the circuit breaker is opened. The circuit breaker provided in the application has a simple and compact structure, fewer parts, and can realize the leakage protection function of the circuit breaker while reducing the overall volume of the circuit breaker, thereby facilitating the installation of the circuit breaker in the standard cabinet, effectively improving the space utilization of the standard cabinet, and meeting the market development demand for miniaturization of the circuit breaker.

[0050] In order to reduce the volume of the circuit breaker and make the overall structure of the circuit breaker more compact, please refer to Figure 1 and Figure 2 Optionally, in the embodiment, the zero-sequence current transformer 20 and the trip unit 30 are arranged along the length direction a of the shell, the circuit board 40 and the transformer are arranged along the width direction b of the shell, and the circuit board 40 and the operating mechanism 50 are arranged along the length direction a of the shell. The length direction a of the shell, the width direction b of the shell and the height direction c of the shell can be referred to Figure 3 and Figure 4 .

[0051] In this way, the leakage protection function module and the basic module of the circuit breaker can be arranged in the shell 10 together, compared with the prior art in which the leakage protection function module and the basic module of the circuit breaker are placed in parallel respectively, the application can reduce the width size of the circuit breaker and effectively reduce the overall volume of the circuit breaker. Relative to the standard cabinet which is compact in height and width direction size and has a surplus in length direction size, the circuit breaker provided in the application has stronger applicability.

[0052] Please refer to Figure 1 , Figure 2 and Figure 5In the embodiment, the circuit board 40 is provided with the first contact 41 and the second contact 42, and the circuit breaker further comprises a leakage test mechanism 60 arranged in the housing 10, the leakage test mechanism 60 comprising a first elastic member 61 having one end in communication with the first contact 41; when the circuit breaker is in the closed state, the other end of the first elastic member 61 is capable of being driven to communicate with the second contact 42; when the two ends of the first elastic member 61 are in communication with the first contact 41 and the second contact 42 respectively, the circuit board 40 is capable of driving the release 30 to trip.

[0053] The leakage test mechanism 60 is used to detect whether the leakage protection function of the circuit breaker is invalid.

[0054] Here, it should be noted that one end of the first elastic member 61 is in communication with the first contact 41, and the other end is in a normally open state with the second contact 42; when the first elastic member 61 is driven to rotate to make the other end of the first elastic member 61 communicate with the second contact 42, the first elastic member 61 communicates with the circuit board 40. The first elastic member 61 can be a torsion spring.

[0055] When the leakage protection function needs to be tested, the end of the first elastic member 61 for communicating with the second contact 42 needs to be driven to rotate towards the second contact 42, so that the first elastic member 61 communicates with the second contact 42, and then the first elastic member 61 communicates with the circuit board 40 (the communication between the first elastic member 61 and the circuit board 40 simulates a leakage signal). Then, the worker only needs to pay attention to whether the circuit breaker is tripped or not, if yes, it means that the leakage protection function of the circuit breaker is good; otherwise, it means that the leakage protection function of the circuit breaker is invalid.

[0056] Under normal circumstances, when the first elastic member 61 communicates with the circuit board 40, the circuit board 40 will send a control command to the release 30, the leakage coil 32 of the release 30 will generate a magnetic field, thereby driving the moving iron core 35 and the static iron core 36 of the release 30 to move downward, and then the release 30 is tripped; after the release 30 is tripped, the operating mechanism 50 is driven to move, so that the operating mechanism 50 drives the moving contact to move away from the static contact to open the circuit breaker. If the first elastic member 61 is driven to communicate with the circuit board 40, but the circuit breaker is not tripped, it means that the leakage protection function has failed. At this time, the worker needs to repair.

[0057] Please refer to Figure 5 and Figure 6Optionally, in order to facilitate the movement of the first elastic member 61, so that the first elastic member 61 and the circuit board 40 are connected, the leakage test mechanism 60 further comprises a test button 62 arranged on the shell 10 and in transmission connection with the first elastic member 61, the test button 62 comprising a body 621 slidably connected to the shell 10 and an acting portion 622 arranged on the body 621, the other end of the first elastic member 61 being capable of being connected with the second contact 42 under the driving action of the acting portion 622.

[0058] The acting portion 622 is located at one end of the body 621 close to the circuit board 40, and is used to drive one end of the first elastic member 61 (i.e. the end in the normally open state with the circuit board 40) to move, so that both ends of the first elastic member 61 are connected with the circuit board 40.

[0059] The test button 62 is made of insulating material, which is conducive to electrical safety. By arranging the test button 62, the leakage test function can be conveniently performed.

[0060] The test button 62 can be provided with a waist-shaped hole, and the shell 10 can be provided with a fixing member matched with the waist-shaped hole, so that the test button 62 can slide in a predetermined direction, thereby improving the accuracy when the test button 62 is used to drive the first elastic member 61.

[0061] Please refer to Figure 3 and Figure 4 Optionally, the test button 62 and the operating handle 80 of the circuit breaker are arranged along the width direction b of the shell. In this way, the test button 62 and the operating handle 80 have the same movement direction, which is conducive to compact structure.

[0062] In the embodiment, please refer to Figure 5 and Figure 6 The test button 62 further comprises a pressing portion 623 arranged on the body 621, the pressing portion 623 and the acting portion 622 being distributed at opposite ends of the body 621, and the pressing portion 623 being exposed outside the shell 10.

[0063] By arranging the pressing portion 623 on the test button 62 and exposing the pressing portion 623 outside the shell 10 (for example, the pressing portion 623 can be extended outside the shell 10; for another example, a groove can be arranged on the shell 10 corresponding to the position of the pressing portion 623, so that the pressing portion 623 is exposed), the operator can be facilitated to operate.

[0064] In addition, in order to facilitate the work of the operator, the pressing portion 623 of the test button 62 and the operating handle 80 of the circuit breaker can be located on the same side of the shell 10, as shown in Figure 3 and Figure 4

[0065] ​Please refer to Figure 6 The test button 62 further comprises an anti-disengagement portion 624 extending from one end of the acting portion 622 towards a direction away from the body 621, and the anti-disengagement portion 624 and the acting portion 622 enclose an acting cavity 625, and one end of the first elastic member 61 for contacting the second contact 42 is limited in the acting cavity 625.

[0066] In this way, the acting cavity 625 limits the one end of the first elastic member 61 for contacting the second contact 42, which can avoid the first elastic member 61 from disengaging from the acting portion 622, and further can ensure that the test button 62 effectively acts on the first elastic member 61.

[0067] The working principle of the circuit breaker provided in the present application is as follows:

[0068] Normal opening and closing: the operating handle 80 of the circuit breaker is in transmission connection with the operating mechanism 50, the operating mechanism 50 is in transmission connection with the movable contact of the circuit breaker, and the movable contact is in transmission connection with the static contact of the circuit breaker. The operating handle 80 of the circuit breaker is driven to move, the operating mechanism 50 is driven to move through the operating handle 80, so that the operating mechanism 50 drives the movable contact to move, so that the movable contact approaches or moves away from the static contact, thereby realizing closing or opening.

[0069] Time delay tripping: similar to the working principle of the ordinary circuit breaker, the double gold of the circuit breaker is driven to move, thereby driving the movable contact to move to disengage from the static contact, and then realizing opening.

[0070] Instantaneous tripping: when the current in the line is too large, the main circuit coil 33 of the release 30 generates a magnetic field, thereby driving the moving iron core 35 to move towards the static iron core 36 against the pressure of the return spring 37, and driving the top rod 38 to extend out of the cavity of the coil frame 31, at this time the release 30 is tripped; the top rod 38 of the release 30 acts on the operating mechanism 50, thereby driving the operating mechanism 50 to move, and the operating mechanism 50 drives the movable contact to move, so that the movable contact and the static contact are separated to open.

[0071] Ground fault tripping: when the line leakage current increases, the leakage current signal of the zero sequence current transformer 20 also increases; the circuit board 40 monitors the leakage current signal of the zero sequence current transformer 20 in real time, when the leakage current value corresponding to the leakage current signal exceeds the leakage current threshold value, the circuit board 40 drives the release 30 to issue a tripping instruction, the leakage coil 32 of the release 30 generates a magnetic field to drive the moving iron core 35 and the top rod 38 to move downward, the top rod 38 extends out of the cavity of the coil frame 31, and the release 30 is tripped; the release 30 drives the operating mechanism 50 to move, so that the operating mechanism 50 drives the movable contact and the static contact to separate, thereby making the circuit breaker open.

[0072] Electric leakage test: when the circuit breaker is in the closed state, manually press the test button 62, the test button 62 drives one end of the first elastic member 61 to rotate, and drives the one end of the first elastic member 61 to contact the second contact 42 on the circuit board 40 (the other end of the first elastic member 61 is in constant contact with the first contact 41 of the circuit board 40), at this time, the circuit board 40 and the first elastic member 61 are changed from the normally open state to the closed state (the simulated electric leakage signal is connected through the circuit board 40 and the first elastic member 61, and whether the circuit breaker can be tripped is used to judge whether the electric leakage protection function of the circuit breaker is failed); at this time, the circuit board 40 drives the release 30 to trip, the electric leakage coil 32 generates a magnetic field to drive the moving iron core 35 and the top rod 38 to move downward, so that the top rod 38 extends from the coil framework 31 to trip; the tripping of the release 30 drives the operating mechanism 50 to move, so that the operating mechanism 50 drives the moving contact to move away from the static contact, and the circuit breaker is tripped. It should be noted that in the electric leakage test process, if the test button 62 is pressed and the circuit breaker is not tripped, it means that the electric leakage protection function of the circuit breaker is failed.

[0073] In order to make the staff know when the circuit breaker is in the electric leakage state, so as to avoid unnecessary risks. Optionally, the circuit breaker further comprises an electric leakage indicating member 70 arranged on the shell 10, which is used to indicate the electric leakage state when the circuit breaker has an electric leakage fault.

[0074] For example, the electric leakage indicating member 70 can be in any one or a combination of multiple forms of words, colors, voices, lights or alarms to prompt the staff; it can also be through the change of the structure of the circuit breaker to prompt the staff. The present application does not limit this, as long as the electric leakage indicating member 70 can prompt the staff to know when there is an electric leakage fault, and does not make the same prompt in other states.

[0075] Optionally, in the present embodiment, one side of the operating handle 80 of the circuit breaker is recessed with a containing groove 81, and the electric leakage indicating member 70 can be accommodated in the containing groove 81, such as Figure 3 and Figure 4 In this way, the structure of the circuit breaker is more compact.

[0076] Hereinafter, the electric leakage indicating manner of one of the electric leakage indicating members 70 will be described by way of example. It should be understood that this manner is only one example of the present application, and is not limited.

[0077] Please refer to Figure 6The circuit board 40 is connected with an electric shrinkable element 92, which will shrink when the circuit breaker has a leakage fault, and will not shrink when other faults occur. The operating handle 80 of the circuit breaker is provided with a receiving groove 81, the inner wall surface of the receiving groove 81 is provided with a clamping groove 82, the receiving groove 81 is provided with a push block 91 which can move in the receiving groove 81 and a leakage indication element 70 which is clamped with the push block 91, the leakage indication element 70 is located above the push block 91, and the push block 91 is connected with the electric shrinkable element 92. The leakage indication element 70 is provided with a limiting element 71 at one end close to the push block 91, and the limiting element 71 is located on the side of the leakage indication element 70 away from the push block 91, and the limiting element 71 is used to cooperate with the clamping groove 82. The leakage indication element 70 is further connected with a third elastic element 94, and the push block 91 is connected with a second elastic element 93.

[0078] When the electric shrinkable element 92 is electrified and shrinks, the electric shrinkable material will pull the push block 91 to move downward, so that the push block 91 is separated from the leakage indication element 70, and the push block 91 drives the limiting block to be clamped in the clamping groove 82, so that the leakage indication element 70 and the operating handle 80 are locked. At this time, when the circuit breaker is tripped due to a leakage fault, the leakage indication element 70 and the operating handle 80 will be ejected together.

[0079] It should be noted that the second elastic element 93 will deform when subjected to an upward and downward force; the third elastic element 94 will deform when subjected to a left and right force. It should be understood that the directions mentioned in the present application are corresponding to the drawings, and are only for the convenience of description, and do not represent the only limitation on the installation mode of the corresponding parts.

[0080] In addition, in the present embodiment, the third elastic element 94 can be connected with the leakage indication element 70, but the leakage indication element 70 and the third elastic element 94 belong to two different parts; alternatively, the third elastic element 94 and the leakage indication element 70 are integrally formed, that is, the third elastic element 94 and the leakage indication element 70 belong to one part (at this time, the third elastic element 94 can be made into an elongated cantilever structure, so that it has the function of an elastic element). Similarly, the second elastic element 93 can be connected with the push block 91, but the push block 91 and the second elastic element 93 belong to two different parts; alternatively, the second elastic element 93 and the push block 91 are integrally formed, that is, the second elastic element 93 and the push block 91 belong to one part (at this time, the second elastic element 93 can also be made into an elongated cantilever structure, so that it has the function of an elastic element).

[0081] In addition, in the present embodiment, as shown in Figure 3 The shell 10 is further provided with a sliding groove 11, and the sliding groove 11 is in a U shape. The sliding center point of the push block 91 and the sliding center point of the leakage indication element 70 can slide in the sliding groove 11. The sliding groove 11 can limit the movement path of the push block 91 and the leakage indication element 70.

[0082] The working principle of the leakage current indicator 70 is as follows:

[0083] In the initial state: as Figure 4 As shown, the circuit breaker is in normal operating condition (i.e., no leakage fault has occurred). At this time, the electro-actuated retractable element 92 is in a free state, the push block 91 and the leakage indicator 70 are engaged, the limiting element 71 is disengaged from the slot 82, and the second elastic element 93 and the third elastic element 94 are both in a free state. The positions of the push block 91 and the leakage indicator 70 in the slide groove 11 are as follows: Figure 6 As shown.

[0084] When a leakage fault occurs: the electro-tightening element 92 is energized and contracts, thereby pulling the push block 91 downward. The second elastic element 93 is compressed and stores energy. At this time, the locking state between the push block 91 and the leakage indicator 70 is broken. The leakage indicator 70 is squeezed by the push block 91 (at this time, the third elastic element 94 is compressed and stores energy), moving to the left, thereby causing the limiting element 71 to lock into the slot 82. In this way, the leakage indicator 70 will lock with the operating handle 80. Figures 9A to 9D As shown, at this time, the positions of the push block 91 and the leakage indicator 70 within the slide groove 11 are as follows: Figure 10A As shown. Simultaneously, when a leakage fault occurs, the circuit board 40 drives the trip unit 30 to trip, thereby tripping the circuit breaker. At this time, the leakage indicator 70 will pop out together with the operating handle 80, as shown. Figure 9A As shown, at this time, the positions of the push block 91 and the leakage indicator 70 within the slide groove 11 are as follows: Figure 10A As shown.

[0085] When resolving a leakage fault: Since the leakage indicator 70 and the operating handle 80 are in a locked state, they can be pressed downwards together with the operating handle 80. When the leakage indicator 70 slides to the bottom of the slide groove 11, the third elastic element 94 releases energy, and the leakage indicator 70 moves to the right to reset (the leakage indicator 70 unlocks from the operating handle 80); at the same time, the electrostrictive element 92 cools and resets, the second elastic element 93 releases stored energy, and the push block 91 moves upwards; thus, the push block 91 and the leakage indicator 70 can reset and re-lock. At this time, the leakage indicator 70 and the push block 91 continue to lock, as... Figure 9B As shown, the positions of the push block 91 and the leakage indicator 70 within the slide groove 11 are as follows: Figure 10B Figure 9C Figure 10C Figure 9D Figure 10A As shown.

[0086] The above description is merely an optional embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0087] It should be further noted that various specific technical features described in the above specific embodiments can be combined in any suitable manner, and in order to avoid unnecessary repetition, the present application will not describe various possible combinations again.

Claims

1. A circuit breaker characterized by, The circuit board is electrically connected with the zero sequence current transformer and the tripping device respectively, the tripping device is in transmission connection with the operating mechanism; The zero sequence current transformer is used for detecting a leakage current signal of the circuit breaker, the circuit board drives the tripping device to trip according to the leakage current signal, so that the tripping device drives the circuit breaker to open through the operating mechanism; The circuit board is provided with a first contact and a second contact, and the circuit breaker further comprises a leakage test mechanism arranged in the shell, the leakage test mechanism comprises a first elastic member having one end in communication with the first contact; when the circuit breaker is in a closed state, the other end of the first elastic member can be driven to communicate with the second contact; the leakage test mechanism further comprises a test button arranged on the shell and in transmission connection with the first elastic member, the other end of the first elastic member can be driven to communicate with the second contact under the driving action of the test button; the test button and the operating handle of the circuit breaker are arranged along the width direction of the shell, and the movement directions of the test button and the operating handle are the same.

2. The circuit breaker of claim 1, wherein, The zero sequence current transformer and the tripping device are arranged along the length direction of the shell, and the circuit board and the transformer are arranged along the width direction of the shell.

3. The circuit breaker of claim 1 or 2, wherein, The circuit board and the operating mechanism are arranged along the length direction of the shell.

4. The circuit breaker of claim 1, wherein, In the state that the two ends of the first elastic member are in communication with the first contact and the second contact respectively, the circuit board can drive the tripping device to trip.

5. The circuit breaker of claim 4, wherein, The test button comprises a body slidingly connected to the shell and an acting portion arranged on the body, and the other end of the first elastic member can be driven to communicate with the second contact under the driving action of the acting portion.

6. The circuit breaker of claim 5, wherein, The test button further comprises a pressing portion arranged on the body, the pressing portion and the acting portion are arranged at opposite ends of the body, and the pressing portion is exposed outside the shell.

7. The circuit breaker of claim 5 or 6, wherein, The test button further comprises an anti-disengagement portion extending from one end of the acting portion towards a direction away from the body, the anti-disengagement portion and the acting portion enclose an acting cavity, and the end of the first elastic member for communicating with the second contact is limited in the acting cavity.

8. The circuit breaker of claim 1 or 4, wherein, The circuit breaker further comprises a leakage indicating member arranged on the shell, and the leakage indicating member is used for indicating a leakage state when the circuit breaker has a leakage fault.

9. The circuit breaker of claim 8, wherein, One side of the operating handle of the circuit breaker is recessed with a containing groove, and the leakage indicating member is accommodated in the containing groove.

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