Molded case circuit breaker

Abstract

The application relates to a molded case circuit breaker, which comprises a base, a switching mechanism and a triggering mechanism, the switching mechanism comprises an operating assembly, a control panel, a tripping device and a traction rod, the triggering mechanism comprises a connecting plate, an overload protection assembly and a short-circuit short-time protection assembly, the connecting plate is arranged on the base, the overload protection assembly is connected to the connecting plate, the overload protection assembly is provided with a first pusher, the short-circuit short-time protection assembly is connected to the overload protection assembly, the short-circuit short-time protection assembly is electrically connected to the control panel, when the overload protection assembly is in an overload state, the first pusher pushes the traction rod to rotate, when the short-circuit short-time protection assembly is in a short-circuit state, the tripping device is controlled to act by the control panel, so that the traction rod rotates and drives the operating assembly to act, and the molded case circuit breaker is disconnected; during assembly, the connecting plate, the overload protection assembly and the short-circuit short-time protection assembly are assembled to form the triggering mechanism, then the connecting plate is installed on the base, the triggering mechanism assembly is completed, the assembly difficulty is reduced, and the assembly efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, and more particularly to a molded case circuit breaker. Background Technology

[0002] Molded case circuit breakers (MCCBs) are primarily used to disconnect circuits when overcurrent occurs, ensuring the safety of lines, equipment, and personal property. MCCBs include short-circuit short-time delay protection devices and overload protection devices to at least achieve both functions. In related technologies, the short-circuit short-time delay protection devices and overload protection devices are mounted in different locations, making installation on MCCBs complex and difficult due to limited operating space. Utility Model Content

[0003] This application provides a molded case circuit breaker to solve the problem of high assembly difficulty of molded case circuit breakers.

[0004] In a first aspect, this application provides a molded case circuit breaker, comprising:

[0005] Base;

[0006] A switching mechanism includes an operating component, a control board, a trip unit, and a traction rod. The operating component, the control board, and the trip unit are respectively disposed on the base, and the trip unit is electrically connected to the control board. The traction rod is rotatably disposed on the base, with one end movably connected to the trip unit and the other end movably connected to the operating component.

[0007] The triggering mechanism includes a connecting plate, an overload protection component, and a short-circuit short-delay protection component. The connecting plate is disposed on the base. The overload protection component is connected to the connecting plate. The overload protection component is provided with a first pushing member. The first pushing member is movable to abut against the traction rod. The short-circuit short-delay protection component is connected to the overload protection component. The short-circuit short-delay protection component is electrically connected to the control board.

[0008] When the overload protection component is in an overload state, the first pusher moves toward the traction rod and pushes the traction rod to rotate, thereby driving the operating component to operate so that the molded case circuit breaker disconnects.

[0009] When the short-circuit short-delay protection component is in a short-circuit state, the control board controls the trip unit to operate and pushes the traction rod to rotate, thereby driving the operating component to operate so that the molded case circuit breaker disconnects.

[0010] Furthermore, the overload protection component includes:

[0011] Heating element, connected to the connecting plate; and

[0012] A heat-deformable component is connected to the heat-generating component; the first pushing component is disposed on the heat-deformable component.

[0013] Furthermore, the short-circuit short-delay protection component includes:

[0014] A micro switch is disposed on the base; the micro switch is electrically connected to the control board;

[0015] The stationary iron core is connected to the heating element;

[0016] The bracket is connected to the stationary iron core;

[0017] The moving iron core is rotatably connected to the bracket via a rotating shaft; one end of the moving iron core is positioned corresponding to the stationary iron core, and the other end abuts against the micro switch;

[0018] A spring is fitted onto the rotating shaft; one end of the spring abuts against the moving iron core, and the other end abuts against the bracket.

[0019] Furthermore, the moving iron core includes:

[0020] A magnetic attraction part is provided corresponding to the stationary iron core, and the magnetic attraction part is located on one side of the rotating shaft; the micro switch is located on the other side of the rotating shaft;

[0021] The mounting part is connected to the side of the magnetic part facing the rotating shaft, and the mounting part is rotatably connected to the rotating shaft;

[0022] A trigger part is connected to the side of the magnetic suction part facing the rotating shaft, and the trigger part is spaced apart from the mounting part; the trigger part is rotatably connected to the rotating shaft, and the trigger part extends to abut against the micro switch;

[0023] The spring is located between the mounting part and the triggering part, and one end of the spring abuts against the magnetic attraction part.

[0024] Furthermore, the bracket has an opening on the side facing the stationary iron core; the heating element passes through the opening and is fitted and connected to the stationary iron core; the heating element is located between the moving iron core and the stationary iron core; the heat-deformable element is fitted to the side of the heating element away from the stationary iron core and extends out of the bracket from the end away from the stationary iron core; the portion of the heat-deformable element located on the bracket has a mounting hole, and the first pushing element passes through the mounting hole.

[0025] Furthermore, the spring is a torsion spring, with the first torsion arm of the torsion spring abutting against the side of the moving iron core facing the stationary iron core, and the second torsion arm of the torsion spring abutting against the bracket.

[0026] Furthermore, the bracket has a limiting boss on the side near the micro switch, the limiting boss has a limiting groove, and the second torsion arm of the torsion spring is movably inserted through the limiting groove.

[0027] Furthermore, it also includes an assembly base, which is disposed on the base, and the micro switch is disposed on the assembly base.

[0028] Furthermore, the traction rod is provided with a first protrusion, and the first pusher abuts against the first protrusion to drive the traction rod to rotate by pushing the first protrusion.

[0029] Furthermore, the trip unit is provided with a second pusher, and the side of the traction rod facing the trip unit is provided with a second protrusion; the second pusher abuts against the second protrusion so as to drive the traction rod to rotate by pushing the second protrusion.

[0030] The technical solution provided in this application has the following advantages compared with the prior art:

[0031] In the technical solution of this application, the connecting plate provides an installation base for the overload protection component, and the overload protection device provides an installation base for the short-circuit short-delay protection component. During assembly, the connecting plate, the overload protection component, and the short-circuit short-delay protection component can be assembled first to form a triggering mechanism. Then, the connecting plate is installed on the base to complete the assembly of the triggering mechanism, reducing assembly difficulty and improving assembly efficiency.

[0032] Furthermore, the overload protection function of the overload protection component and the short-circuit short-delay protection function of the short-circuit short-delay protection component in this application remain independent and do not affect each other. Specifically, when the short-circuit short-delay protection component is in a short-circuit state, after receiving a short-circuit signal, the control board outputs voltage to the trip unit after a set time. The trip unit actuates, pushing the traction rod to rotate. The rotation of the traction rod drives the operating action, thus disconnecting the molded case circuit breaker, i.e., disconnecting the circuit. Thus, the short-circuit short-delay protection component is connected to the control board, and the control board controls the action of the trip unit to achieve the short-circuit short-delay function. When the overload protection component is in an overload state, the first pusher moves towards the traction rod to push the traction rod to rotate. The rotation of the traction rod drives the operating action, thus disconnecting the molded case circuit breaker, i.e., disconnecting the circuit. This achieves the overload protection function. Clearly, the overload protection component and the short-circuit short-delay protection component achieve the disconnection of the molded case circuit breaker through different paths and do not affect each other. Attached Figure Description

[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0036] Figure 1 This is a schematic diagram of the structure of a molded case circuit breaker provided in an embodiment of this application;

[0037] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0038] Figure 3 for Figure 1 It includes partial schematic diagrams of overload protection components and short-circuit short-delay protection components;

[0039] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0040] Figure 5 for Figure 4 Diagram of the middle section structure;

[0041] Figure 6 for Figure 5 Schematic diagram of the structure of the moving iron core;

[0042] Figure 7 for Figure 1 The diagram shows a partial structure including the pull rod and the release mechanism.

[0043] Explanation of reference numerals in the attached figures:

[0044] Base 1, Assembly base 11

[0045] Operating component 21, control panel 22, trip unit 23, second pusher 231, traction rod 24, first protrusion 241, second protrusion 242, and re-clamp 25.

[0046] Connecting plate 31,

[0047] Overload protection component 32, first pusher 321, heating element 322, heat deformation element 323, mounting hole 323a,

[0048] Short-circuit short-delay protection component 33, micro switch 331, pressure plate 3311, stationary iron core 332, bracket 333, opening 333a, limiting boss 3331, limiting groove 333b, moving iron core 334, magnetic suction part 3341, mounting part 3342, trigger part 3343, pushing part 3344, spring 335, second torsion arm 3351, rotating shaft 336.

[0049] Short-circuit instantaneous protection component 34. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0052] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0053] To address the technical problem of high assembly difficulty in existing molded case circuit breakers, this application provides a molded case circuit breaker that can reduce assembly difficulty and improve assembly efficiency.

[0054] Firstly, Figures 1 to 7 A molded case circuit breaker provided in this application embodiment includes a base 1, a switching mechanism, and a triggering mechanism. The switching mechanism includes an operating component 21, a control board 22, a trip unit 23, and a traction rod 24. The molded case circuit breaker also includes a contact assembly, which includes a moving contact and a stationary contact. The operating component 21 is located on the base 1, and the operating mechanism is connected to the moving contact. The operating mechanism can manually or automatically move the moving contact to contact the stationary contact to achieve closing, or move the moving contact to separate from the stationary contact to achieve opening. When closing, the molded case circuit breaker is conducting. When opening, the molded case circuit breaker is disconnected.

[0055] The control board 22 is located on the base 1, and the trip unit 23 is electrically connected to the control board 22; the traction rod 24 is rotatably located on the base 1, and one end of the traction rod 24 is movably connected to the trip unit 23, and the other end is movably connected to the operating component 21.

[0056] The triggering mechanism includes a connecting plate 31, an overload protection component 32, and a short-circuit short-delay protection component 33. The connecting plate 31 is located on the base 1. The overload protection component 32 is connected to the connecting plate 31. The overload protection component 32 is provided with a first pushing member 321. The first pushing member 321 is movable to abut against the traction rod 24. The short-circuit short-delay protection component 33 is connected to the overload protection component 32. The short-circuit short-delay protection component 33 is electrically connected to the control board 22. It can be understood that the connecting plate 31 provides an installation base for the overload protection component 32, and the overload protection device provides an installation base for the short-circuit short-delay protection component 33. During assembly, the connecting plate 31, the overload protection component 32, and the short-circuit short-delay protection component 33 can be assembled first to form the triggering mechanism. Then, the connecting plate 31 can be installed on the base 1 to complete the assembly of the triggering mechanism, reducing the assembly difficulty and improving the assembly efficiency.

[0057] When the short-circuit short-delay protection component 33 is in a short-circuit state, the control board 22 controls the trip unit 23 to operate, pushing the traction rod 24 to rotate, which in turn drives the operating component 21 to operate, causing the molded case circuit breaker to open. Specifically, when the short-circuit short-delay protection component 33 is in a short-circuit state, after receiving a short-circuit signal, the control board 22 outputs voltage to the trip unit 23 after a set time. The trip unit 23 operates, pushing the traction rod 24 to rotate. The rotation of the traction rod 24 drives the operating action. The operating component 21 is used to connect the moving contact, which can realize the opening of the molded case circuit breaker, that is, the disconnection of the circuit. In this way, the short-circuit short-delay protection component 33 is connected to the control board 22, and the control board 22 controls the operation of the trip unit 23 to realize the short-circuit short-delay function.

[0058] When the overload protection component 32 is in an overload state, the first pusher 321 moves toward the traction rod 24 to push the traction rod 24 to rotate. When the traction rod 24 rotates, it drives the operating action. The operating component 21 is used to connect the moving contact, which can realize the disconnection of the molded case circuit breaker, that is, the disconnection of the line. In this way, the overload protection function is realized.

[0059] In this application, the overload protection component 32 and the short-circuit short-delay protection component 33 achieve the disconnection of the molded case circuit breaker through different path methods. The overload protection function of the overload protection component 32 and the short-circuit short-delay protection component 33 remain independent and do not affect each other.

[0060] like Figures 2 to 5 As shown, in this embodiment, the overload protection component 32 includes a heating element 322 and a heat-deformation element 323. The heating element 322 is connected to the connecting plate 31; the heat-deformation element 323 is connected to the heating element 322; and a first pushing member 321 is disposed on the heat-deformation element 323. The connecting plate 31 provides a mounting base for the heating element 322, that is, it provides a mounting base for the overload protection component 32. In one embodiment, the connecting plate 31 and the heating element 322 are connected by welding.

[0061] When an overload occurs in the circuit where the molded case circuit breaker is located, the heating element 322 will generate heat and conduct the heat to the heat-deformable element 323. The heat-deformable element 323 will deform and drive the first pushing element 321 to shift towards the traction rod 24, thereby pushing the traction rod 24 to rotate. In one embodiment, the heat-deformable element 323 is a bimetallic sheet.

[0062] like Figure 4 As shown, in the technical solution of this embodiment, the short-circuit short-delay protection component 33 includes a micro switch 331, a stationary iron core 332, a bracket 333, a moving iron core 334, and a spring 335. The stationary iron core 332 is connected to the heating element 322, and the bracket 333 is connected to the stationary iron core 332. The moving iron core 334 is rotatably connected to the bracket 333 via a rotating shaft 336. One end of the moving iron core 334 is positioned corresponding to the stationary iron core 332, and the other end abuts against the micro switch 331. The micro switch 331 is located on the base 1. The micro switch 331 is electrically connected to the control board 22. The spring 335 is sleeved on the rotating shaft 336. One end of the spring 335 abuts against the moving iron core 334, and the other end abuts against the bracket 333.

[0063] The heating element 322 provides an installation position for the stationary iron core 332, the stationary iron core 332 provides an installation position for the bracket 333, and the bracket 333 provides an installation position for the moving iron core 334 and the spring 335. In this way, the overload protection component 32 and the short-circuit short-delay protection component 33 can be integrated, which not only improves assembly efficiency, but also makes reasonable use of space and reduces the space occupied, thereby achieving the goal of reducing the size of the molded case circuit breaker.

[0064] In this embodiment, the micro switch 331 is equipped with a pressure plate and is positioned close to the bracket 333. Under normal conditions, the moving iron core 334 presses against the pressure plate of the micro switch 331, keeping the micro switch 331 in the open state. When a short circuit occurs in the circuit containing the molded case circuit breaker, the moving iron core 334 is attracted by the stationary iron core 332, and moves towards the stationary iron core 332. Since the moving iron core 334 is rotatably connected to the bracket 333 via a rotating shaft 336, the other end of the moving iron core 334 moves away from the micro switch 331, causing the micro switch 331 to conduct. After the micro switch 331 conducts, the control board 22 receives the conduction signal from the micro switch 331 and can control the trip unit 23 to operate after a set time, causing the molded case circuit breaker to open, thus achieving a short-circuit short-delay function.

[0065] like Figure 6 As shown, in the technical solution of this embodiment, the moving iron core 334 includes a magnetic attraction part 3341, a mounting part 3342, and a trigger part 3343. The magnetic attraction part 3341 is disposed corresponding to the stationary iron core 332 and is located on one side of the rotating shaft 336; the micro switch 331 is located on the other side of the rotating shaft 336; the mounting part 3342 is connected to the side of the magnetic attraction part 3341 facing the rotating shaft 336, and the mounting part 3342 is rotatably connected to the rotating shaft 336; the trigger part 3343... 343 is connected to the side of the magnetic suction part 3341 facing the rotating shaft 336, and the trigger part 3343 and the mounting part 3342 are spaced apart; the trigger part 3343 is rotatably connected to the rotating shaft 336, and the trigger part 3343 extends to abut against the micro switch 331; wherein, the spring 335 is located between the mounting part 3342 and the trigger part 3343, one end of the spring 335 abuts against the magnetic suction part 3341, and the elastic element can provide a force to reset the moving iron core 334.

[0066] Understandably, the micro switch 331 and the stationary iron core 332 are located on opposite sides of the rotating shaft 336. The magnetic attraction part 3341 is positioned on one side of the rotating shaft 336 corresponding to the stationary iron core 332. The moving iron core 334 can be attracted by the stationary iron core 332 under a certain magnetic field strength, which can improve the response efficiency of the moving iron core 334. The trigger part 3343 extends towards the other side of the rotating shaft 336 to trigger the micro switch 331 to turn on or off. The extended trigger part 3343 allows the micro switch 331 to be mounted near the end of the bracket 333 away from the stationary iron core 332, achieving a compact structure.

[0067] like Figure 4 As shown, in the technical solution of this embodiment, the bracket 333 has an opening 333a on the side facing the stationary iron core 332; the heating element 322 passes through the opening 333a and is attached to the stationary iron core 332; the heating element 322 is located between the moving iron core 334 and the stationary iron core 332; the heat-deformable element 323 is attached to the side of the heating element 322 away from the stationary iron core 332, and extends out of the bracket 333 from the end away from the stationary iron core 332; the part of the heat-deformable element 323 located in the bracket 333 has a mounting hole 323a, and the first pusher 321 passes through the mounting hole 323a.

[0068] It is understandable that by setting the opening 333a, the heating element 322 and the heat deformation element 323 can be inserted into the bracket 333, resulting in a compact structure, reduced space occupation, and reduced volume.

[0069] In this embodiment, the shape of the connecting plate 31 can be reasonably designed according to the layout structure of the molded case circuit breaker, and can be flexibly set.

[0070] In this embodiment, the spring 335 is a torsion spring. The first torsion arm of the torsion spring abuts against the side of the moving iron core 334 facing the stationary iron core 332, and the second torsion arm 3351 of the torsion spring abuts against the bracket 333. The torsion spring has a simple structure and is easy to install.

[0071] refer to Figure 4 The side of the bracket 333 closest to the first pusher 321 is designed to be open, which can avoid the bracket 333 from affecting the first pusher 321 and also allow the first pusher 321 to have a certain space for position adjustment.

[0072] like Figure 2 and Figure 4 As shown, in this embodiment, the bracket 333 has a limiting boss 3331 on the side near the micro switch 331, and the limiting boss 3331 has a limiting groove 333b. The second torsion arm 3351 of the torsion spring is movably inserted through the limiting groove 333b. It can be understood that the limiting boss 3331 provides a support position for the torsion spring. Furthermore, the limiting groove 333b can limit the movement of the second torsion arm 3351, thus improving stability.

[0073] like Figure 3As shown, the technical solution of this embodiment also includes a mounting base 11, which is disposed on the base 1, and a micro switch 331 is disposed on the mounting base 11. The micro switch 331 is mounted on the base 1 via the mounting base 11, facilitating replacement of the micro switch 331 without affecting the triggering mechanism. Furthermore, the mounting position of the micro switch 331 can be adjusted according to the position of the triggering part 3343 of the moving iron core 334.

[0074] like Figure 2 , Figure 3 , Figure 4 and Figure 7 As shown, in this embodiment, the traction rod 24 is provided with a first protrusion 241, and the first pushing member 321 abuts against the first protrusion 241 to drive the traction rod 24 to rotate by pushing the first protrusion 241. It can be understood that the first pushing member 321 pushes the first protrusion 241, causing the force exerted by the first pushing member 321 on the traction rod 24 to generate a torque on the traction rod 24, reducing the possibility of the traction rod 24 being unable to be pushed. Furthermore, the first protrusion 241 can expand the contact area of ​​the first pushing member 321. Within the range of displacement of the first pushing member 321 caused by the deformation of the heat-deformed part 323, the first pushing member 321 can always abut against the first protrusion 241, continuously pushing the traction rod 24 and ensuring the overload protection function.

[0075] like Figure 7 As shown, in this embodiment, the trip unit 23 is provided with a second pushing member 231, and the traction rod 24 is provided with a second protrusion 242 on the side facing the trip unit 23. The second protrusion 242 is at a certain distance from the axis of the traction rod 24. The second pushing member 231 abuts against the second protrusion 242 to drive the traction rod 24 to rotate by pushing the second protrusion 242. It can be understood that the first pushing member 321 pushes the first protrusion 241, so that the force of the first pushing member 321 on the traction rod 24 generates a torque on the traction rod 24, reducing the possibility of the traction rod 24 being unable to be pushed, and ensuring the short-circuit short-delay protection function.

[0076] In this embodiment, the traction rod 24 is connected to the traction shaft via a re-clamp 25, achieving a stable connection of the traction rod 24. The re-clamp 25 is movably connected to the latch in the operating assembly 21. When the re-clamp 25 rotates, it drives the latch to rotate, which in turn moves the operating part in the operating assembly 21, thereby moving the moving contact to achieve opening or closing. It should be noted that the structure of the re-clamp 25, the latch, and the operating part can adopt the structure of the operating assembly 21 connected to the moving contact in the existing molded case circuit breaker. This application does not improve the structure of the operating assembly 21 itself. Further details will not be elaborated further.

[0077] It should be noted that in the technical solutions of this application embodiment, the overload protection component is suitable for scenarios with a small overload current (e.g., the overload current is 1.3 times the rated current). The short-circuit short-delay protection component is suitable for scenarios with a large instantaneous current (e.g., the instantaneous current is 10 times the rated current). The molded case circuit breaker of this application embodiment also has a short-circuit instantaneous protection component with short-circuit instantaneous protection function, which is suitable for scenarios with a large instantaneous current (e.g., the instantaneous current is 16 times the rated current).

[0078] For details, see Figure 3 The short-circuit transient protection component 34 is located between the triggering mechanism and the control board. The structure of the short-circuit transient protection component 34 is basically the same as the triggering mechanism, the difference being that it does not have a microswitch and does not need to be electrically connected to the control board. The specific structure of the short-circuit transient protection component 34 will not be described in detail here. See also... Figure 3 and Figure 6 In the short-circuit instantaneous protection component, the moving iron core 334 of the short-circuit instantaneous protection component has a pusher 3344 on the side of the trigger portion facing the traction rod 24. When the instantaneous current is large, the moving iron core 334 of the short-circuit instantaneous protection component is attracted and rotated by the stationary iron core, thereby driving the pusher to move towards the traction rod. The pusher pushes the traction rod to rotate, achieving the purpose of instantaneously cutting off the circuit without the need for a delay through a control board. In one embodiment of this application, the moving iron core of the short-circuit short-delay protection component adopts the same structure as the moving iron core of the short-circuit instantaneous protection component. To avoid affecting the delay protection, a clearance space is provided at the position of the first protrusion 241 corresponding to the pusher 3344 of the short-circuit short-delay protection component.

[0079] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0080] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0081] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0082] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0083] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0084] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0085] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0086] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A molded case circuit breaker characterized by, include: Base (1); The switching mechanism includes an operating component (21), a control board (22), a trip unit (23), and a traction rod (24). The operating component (21), the control board (22), and the trip unit (23) are respectively disposed on the base (1). The trip unit (23) is electrically connected to the control board (22). The traction rod (24) is rotatably disposed on the base (1), and one end of the traction rod (24) is movably connected to the trip unit (23), and the other end is movably connected to the operating component (21). as well as The triggering mechanism includes a connecting plate (31), an overload protection component (32), and a short-circuit short-delay protection component (33). The connecting plate (31) is disposed on the base (1). The overload protection component (32) is connected to the connecting plate (31). The overload protection component (32) is provided with a first pusher (321). The first pusher (321) is movable to abut against the traction rod (24). The short-circuit short-delay protection component (33) is connected to the overload protection component (32). The short-circuit short-delay protection component (33) is electrically connected to the control board (22). When the overload protection component (32) is in an overload state, the first pusher (321) moves toward the traction rod (24) and pushes the traction rod (24) to rotate, thereby driving the operating component (21) to operate so that the molded case circuit breaker disconnects. When the short-circuit short-delay protection component (33) is in a short-circuit state, the trip unit (23) is controlled by the control board (22) to operate and push the traction rod (24) to rotate, thereby driving the operating component (21) to operate so that the molded case circuit breaker is disconnected.

2. The molded case circuit breaker of claim 1, wherein, The overload protection component (32) includes: Heating element (322), connected to the connecting plate (31); and A heat-deformable component (323) is connected to the heat-generating component (322); the first pusher (321) is disposed on the heat-deformable component (323).

3. The molded case circuit breaker of claim 2, wherein, The short-circuit short-delay protection component (33) includes: A micro switch (331) is disposed on the base (1); the micro switch (331) is electrically connected to the control board (22); The stationary iron core (332) is connected to the heating element (322); The bracket (333) is connected to the stationary iron core (332); The moving iron core (334) is rotatably connected to the bracket (333) via a rotating shaft (336); one end of the moving iron core (334) is set corresponding to the stationary iron core (332), and the other end abuts against the micro switch (331); A spring (335) is sleeved on the rotating shaft (336); one end of the spring (335) abuts against the moving iron core (334), and the other end abuts against the bracket (333).

4. The molded case circuit breaker of claim 3, wherein, The moving iron core (334) includes: A magnetic suction part (3341) is provided corresponding to the stationary iron core (332), and the magnetic suction part (3341) is located on one side of the rotating shaft (336); the micro switch (331) is located on the other side of the rotating shaft (336); The mounting part (3342) is connected to the side of the magnetic part (3341) facing the rotating shaft (336), and the mounting part (3342) is rotatably connected to the rotating shaft (336); A trigger part (3343) is connected to the side of the magnetic suction part (3341) facing the rotating shaft (336), and the trigger part (3343) and the mounting part (3342) are spaced apart; the trigger part (3343) is rotatably connected to the rotating shaft (336), and the trigger part (3343) extends to abut against the micro switch (331); The spring (335) is located between the mounting part (3342) and the trigger part (3343), and one end of the spring (335) abuts against the magnetic attraction part (3341).

5. The molded case circuit breaker of claim 3, wherein, The bracket (333) has an opening (333a) on the side facing the stationary iron core (332); the heating element (322) passes through the opening (333a) and is fitted and connected to the stationary iron core (332); the heating element (322) is located between the moving iron core (334) and the stationary iron core (332); the heat-deformable element (323) is fitted to the side of the heating element (322) away from the stationary iron core (332) and extends out of the bracket (333) from the end of the bracket (333) away from the stationary iron core (332); the part of the heat-deformable element (323) located on the bracket (333) has a mounting hole (323a), and the first pusher (321) passes through the mounting hole (323a).

6. The molded case circuit breaker of claim 3, wherein, The spring (335) is a torsion spring, the first torsion arm of the torsion spring abuts against the side of the moving iron core (334) facing the stationary iron core (332), and the second torsion arm (3351) of the torsion spring abuts against the bracket (333).

7. The molded case circuit breaker of claim 6, wherein, The bracket (333) has a limiting boss (3331) on the side near the micro switch (331), and the limiting boss (3331) has a limiting groove (333b). The second torsion arm (3351) of the torsion spring is movably inserted through the limiting groove (333b).

8. The molded case circuit breaker of any one of claims 3 to 7, wherein, It also includes a mounting base (11), which is disposed on the base (1), and the micro switch (331) is disposed on the mounting base (11).

9. The molded case circuit breaker of any one of claims 1 to 7, wherein, The traction rod (24) is provided with a first protrusion (241), and the first pusher (321) abuts against the first protrusion (241) to drive the traction rod (24) to rotate by pushing the first protrusion (241).

10. The molded case circuit breaker of any one of claims 1 to 7, wherein, The trip unit (23) is provided with a second pusher (231), and the traction rod (24) is provided with a second protrusion (242) on the side facing the trip unit (23); the second pusher (231) abuts against the second protrusion (242) so as to drive the traction rod (24) to rotate by pushing the second protrusion (242).

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