Molded case circuit breaker

Abstract

The utility model discloses a molded case circuit breaker, an operating mechanism comprises a handle, and the handle is rotatably arranged along a rotation center in the length direction of the molded case circuit breaker; the handle comprises a handle, a main body part and a reset part, one end of the handle is operated by a user, and the other end of the handle is connected with the main body part; in the length direction of the molded case circuit breaker, the magnetic flux release is arranged on one side of the operating mechanism, the main body part comprises a first end and a second end, the second end is closer to the magnetic flux release than the first end, and the reset part is connected with the second end and located between the second end and the magnetic flux release; when the operating mechanism executes re-buckling operation, the rotation of the handle causes the reset part to act on the actuated magnetic flux release, so that the magnetic flux release is reset; an imaginary connecting line between the first end of the main body part and the rotation center is a first connecting line, an imaginary connecting line between the reset part and the rotation center is a second connecting line, and the second connecting line is longer than the first connecting line; the reset device has the advantage of being convenient to reset.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical appliances, specifically a molded case circuit breaker. Background Technology

[0002] Existing electronic molded case circuit breakers and residual current molded case circuit breakers all utilize a flux trip unit to complete the tripping operation of the operating mechanism. Furthermore, after tripping, the flux trip unit is reset using a lever when the operating mechanism performs a re-triggering action.

[0003] For example, the residual current trip device of a circuit breaker disclosed in CN208873692U is a three-pole circuit breaker. Since the three-pole circuit breaker shares one operating mechanism and one magnetic flux trip device, the magnetic flux trip device can often be placed in the oblique direction (combined direction of length and width) of the operating mechanism. The lever of the operating mechanism can also act on the magnetic flux trip device, thus completing the reset of the magnetic flux trip device.

[0004] However, for a multi-phase molded case circuit breaker that can be operated independently or a single-phase molded case circuit breaker, each phase has an electromagnetic trip unit and an operating mechanism. In this case, the electromagnetic trip unit cannot be set at an angle to the operating mechanism as in the existing technology CN208873692U, otherwise it will lead to an increase in the overall width of the circuit breaker.

[0005] Therefore, for a multi-phase molded case circuit breaker that can operate independently or a single-phase molded case circuit breaker, how to achieve the reset of the flux trip unit becomes a question worth considering. Summary of the Invention

[0006] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and to provide a molded case circuit breaker.

[0007] This application provides: a molded case circuit breaker, comprising at least one phase line, each phase line having an operating mechanism and a corresponding flux trip unit, wherein the flux trip unit, when actuated, causes the operating mechanism to perform a tripping operation; wherein the operating mechanism includes a handle, the handle being rotatably disposed along a rotation center in the length direction of the molded case circuit breaker; the handle includes a grip, a main body, and a reset part, one end of the grip being for user operation, and the other end of the grip being connected to the main body; in the length direction of the molded case circuit breaker, the flux trip unit is arranged on one side of the operating mechanism, the main body including a first end and a second end, the second end being closer to the flux trip unit than the first end, the reset part being connected to the second end and located between the second end and the flux trip unit; when the operating mechanism performs a re-tripping operation, the rotation of the grip causes the reset part to act on the actuated flux trip unit, thereby resetting the flux trip unit; an imaginary line connecting the first end of the main body to the rotation center is a first line, and an imaginary line connecting the reset part to the rotation center is a second line, the length of the second line being greater than the length of the first line.

[0008] In some embodiments of this application, the operating mechanism includes a traction rod, a flux trip unit corresponding to the traction rod, and the flux trip unit, when actuated, pushes the traction rod to rotate so that the operating mechanism performs a tripping operation; the operating mechanism includes a closed state, an open state, and a tripped state; the handle has a closed position corresponding to the closed state, an open position corresponding to the open state, and a tripped position corresponding to the tripped state; the process of the handle moving from the tripped position to the open position is the re-tightening operation of the operating mechanism; when the handle is in the closed position, there is a gap between the reset part and the flux trip unit, and at least a portion of the reset part is directly above the traction rod in the height direction of the molded case circuit breaker.

[0009] In some embodiments of this application, the flux trip device includes an actuating rod, which includes a triggering part and a restoring part. In the width direction of the molded case circuit breaker, the triggering part is located on one side of the restoring part, and in the length direction of the molded case circuit breaker, the triggering part protrudes from the restoring part. After the flux trip device is actuated, the triggering part pushes the traction rod to rotate. When the operating mechanism performs a re-tripping operation, the reset part pushes the restoring part of the actuating rod to reset the flux trip device.

[0010] In some embodiments of this application, the width of any part of the reset part is smaller than the width of the second end, so that a clearance notch is formed on one side of the reset part, and the clearance notch is used to avoid the trigger part.

[0011] In some embodiments of this application, the molded case circuit breaker includes a base and a mounting plate, with the operating mechanism fixed on the base; the mounting plate is fixed to the base and is at least partially embedded in the base, and the flux trip unit is fixed on the mounting plate.

[0012] In some embodiments of this application, the number of operating mechanisms and the number of magnetic flux trip devices are at least two, with each magnetic flux trip device fixed on its corresponding mounting plate or all magnetic flux trip devices fixed on the same mounting plate.

[0013] In some embodiments of this application, a controller box is also included, which is fixed to the base; the controller box extends at least partially beyond the base, and a receiving chamber is formed on the extended portion, in which a magnetic flux trip device is arranged.

[0014] In some embodiments of this application, the number of operating mechanisms and the number of magnetic flux trip devices are at least two, and the number of receiving chambers on the controller box corresponds one-to-one with the number of magnetic flux trip devices; a first dividing rib is provided on the base, and a second dividing rib is provided on the controller box, and the first dividing rib and the second dividing rib together separate two adjacent receiving chambers.

[0015] In some embodiments of this application, the receiving chamber has an opening facing the operating mechanism, and an avoidance structure is provided on the opening to avoid the reset part; when the operating mechanism performs a re-clamping operation, the reset part enters the receiving chamber through the avoidance structure and pushes the magnetic flux trip device to reset.

[0016] In some embodiments of this application, the base is provided with a main circuit conductor with the same number of phase wires. The controller box includes a first insert plate portion corresponding to each main circuit conductor. The first insert plate portion is plugged into the base and forms a first through slot, through which the corresponding main circuit conductor is passed.

[0017] In some embodiments of this application, the number of phase wires is at least two, a first dividing rib is provided on the base, the first dividing rib separates two adjacent phase wires, and the controller box and the first dividing rib form an interlocking structure.

[0018] The advantages of this application compared to the prior art are:

[0019] With this structure, the flux trip unit is positioned only on one side of the operating mechanism (or the length of the molded case circuit breaker) along the length of the circuit breaker. A reset part is added to the second end of the handle. When the flux trip unit needs to be reset, it is pushed back down by the reset part. This achieves the normal reset of the flux trip unit using the handle, while minimizing the increase in the width of the circuit breaker. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 An exploded schematic diagram of a molded case circuit breaker according to an embodiment of this application is shown;

[0022] Figure 2 This paper shows a schematic diagram of a molded case circuit breaker according to an embodiment of the present application after part of the housing has been removed;

[0023] Figure 3 A schematic diagram of the operating mechanism and other components of a certain phase line in an embodiment of this application is shown;

[0024] Figure 4 This paper shows a partially enlarged view of the operating mechanism and flux trip unit of a certain phase line according to an embodiment of this application;

[0025] Figure 5 A schematic diagram of the handle according to an embodiment of this application is shown;

[0026] Figure 6 This diagram shows the positional relationship of components such as the handle, magnetic trip unit, and traction rod when the circuit breaker is in the closed state in an embodiment of this application.

[0027] Figure 7 This diagram illustrates the positional relationship of components such as the handle, magnetic trip unit, and traction rod when the circuit breaker is in the tripped state according to an embodiment of this application.

[0028] Figure 8 This diagram illustrates the positional relationship of components such as the handle, magnetic trip unit, and traction rod when the circuit breaker is in the open state (after the re-tightening action) in an embodiment of this application.

[0029] Figure 9 A schematic diagram of the flux trip device according to an embodiment of this application is shown;

[0030] Figure 10 A schematic diagram showing another perspective of the handle of an embodiment of this application is illustrated;

[0031] Figure 11 A schematic diagram of the operating mechanism in an embodiment of this application is shown;

[0032] Figure 12 A cross-sectional view of the operating mechanism in an embodiment of this application is shown;

[0033] Figure 13 A schematic diagram of the cooperation between the magnetic flux trip device and the base in an embodiment of this application is shown;

[0034] Figure 14 A schematic diagram showing the cooperation between the controller box, the magnetic flux release device, and the base in an embodiment of this application is shown;

[0035] Figure 15 A schematic diagram of the controller box in an embodiment of this application is shown;

[0036] Figure 16 This illustration shows another perspective view of the controller box, magnetic flux release device, and base after they are assembled in an embodiment of this application. Detailed Implementation

[0037] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0038] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. Example

[0042] like Figure 1-16 As shown, an embodiment of this application is a molded case circuit breaker, which includes a circuit breaker housing 100.

[0043] The circuit breaker housing 100 houses the operating mechanism 200 and the main circuit conductor 300. In this embodiment, this molded case circuit breaker is a pole circuit breaker, meaning it has three phase lines. Each phase line has a main circuit conductor 300, an operating mechanism 200, and a flux trip unit 500. Each operating mechanism 200 can independently control the opening and closing of one main circuit conductor 300. Each flux trip unit 500 can cause one operating mechanism 200 to trip. Therefore, the opening, closing, and tripping of each phase line are independent of each other.

[0044] In this embodiment, the circuit breaker housing 100 includes a base 101, and the operating mechanism 200 and the main circuit conductor 300 are both mounted on the base 101.

[0045] Since the basic structure of each phase line is the same, the following will introduce the operating mechanism 200, contact structure and magnetic flux trip device 500 of one phase line.

[0046] The operating mechanism 200 includes a frame 201, a lever 202, a handle 203, a trip latch 204, a locking latch 205, an upper connecting rod 206, a lower connecting rod 207, a re-fastener 208, a traction rod 209, and a main tension spring (not shown in the figure). The lever 202 is rotatably mounted to the frame 201. The handle 203 is fixed to the lever 202. Since the frame 201 is stationary relative to the circuit breaker housing 100, the handle 203 is effectively rotating. The trip latch 204 is rotatably mounted to the frame 201. The upper connecting rod 206 is rotatably mounted to the trip latch 204. The lower connecting rod 207 is hinged to the upper connecting rod 206. The hinged positions of the upper and lower connecting rods 207 are connected to the lever 202 via the main tension spring. The other end of the lower connecting rod 207 is connected to the rotating shaft of the contact structure. The locking buckle 205 is rotatably mounted on the frame 201, and the re-fastening element 208 is mounted on the traction rod 209. The traction rod 209 is rotatably mounted with the frame 201. The trip buckle 204, locking buckle 205, re-fastening element 208, and traction rod 209 constitute the locking mechanism. This operating mechanism 200 has three states: closed, released, and closed. Similarly, the handle 203 also has three corresponding positions: closed position N, released position T, and open position F.

[0047] When the molded case circuit breaker is in the closed state, the operating mechanism 200 is also in the closed state. At this time, the trip latch 204, the locking latch 205, and the re-clamp 208 maintain a stable state (also called the locked state of the locking mechanism), and the main tension spring is in the stretched state. When the stable state of the three is released (also called the unlocked state of the locking mechanism), the operating mechanism 200 will trip under the action of the main tension spring, and the lower connecting rod 207 will drive the rotating shaft to rotate, causing the corresponding phase line to be disconnected. There are many ways to contact the stable state of the three, such as the actuation of the magnetic flux trip device 500 mentioned below.

[0048] After the stable state of the three components is released, the operating mechanism 200 is in the tripped state, and the handle 203 is in the tripped position T. If it is necessary to make the tripping latch 204, the locking latch 205, and the re-clamping component 208 return to a stable state, the operating mechanism 200 needs to be re-clamped. That is, the handle 203 is driven from the tripped position T to the open position F, so that the tripping latch 204, the locking latch 205, and the re-clamping component 208 return to a stable state. Then, manual opening and closing operations can be performed.

[0049] The transmission principle of the above-mentioned operating mechanism 200 is a conventional method for those skilled in the art, and will not be described in detail here.

[0050] Whether the flux trip unit 500 is actuated is determined by the controller 400, which is common knowledge in the art. As is common practice, the controller 400 samples the main circuit of each phase line and compares the sampling results with a preset threshold to determine if there is an abnormality in the corresponding phase line. If an abnormality is found, the flux trip unit 500 (the flux trip unit 500 for the abnormal phase line) is actuated. There are many types of phase line abnormalities, such as overvoltage, undervoltage, overload, short circuit, overtemperature, etc.

[0051] Taking electronic overload protection and electronic short-circuit protection as an example, a protective transformer 600 is installed on the main circuit conductor 300 of each phase line.

[0052] The protection transformer 600 is electrically connected to the controller 400, and the controller 400 is electrically connected to the flux trip unit 500. The current information collected by the protection transformer 600 is fed back to the controller 400. When the controller 400 determines that the feedback information meets the criteria for a short circuit or overload (reaching the corresponding threshold), it sends an electrical signal to actuate the flux trip unit 500. The flux trip unit 500 drives the traction rod 209 to rotate, causing the operating mechanism 200 to trip, thus achieving short circuit protection or overload protection.

[0053] Of course, other types of protection can also be achieved using the flux trip unit 500, but the data detected will differ. For example, over-temperature protection detects the temperature of the main circuit conductor 300. If the temperature becomes abnormal, the flux trip unit 500 will be activated. Over-voltage, under-voltage protection, and so on will not be listed here.

[0054] Of course, while the flux trip unit 500 here can be used as a protection component for many types of protection, it does not mean that it must be used as a protection component for many types of protection. It can be used as a protection component for overload protection and short circuit protection only.

[0055] Here, each flux trip unit 500 is individually controlled by the controller 400. When any phase line is abnormal, the controller 400 controls the flux trip unit 500 of the abnormal phase line to actuate, driving the corresponding locking component to unlock, so that the corresponding operating mechanism 200 changes to the tripped state. That is to say, the protection between each phase line is independent of each other.

[0056] The magnetic flux trip unit 500 cannot reset itself after actuation; it must be reset by the corresponding operating mechanism 200. Specifically, the operating mechanism 200 resets the unit when it performs a re-triggering operation.

[0057] For each phase, in the length direction L of the molded case circuit breaker (or in other words, in the length direction L of the phase line), the flux trip unit 500 is arranged on one side of the operating mechanism 200. That is to say, in this way, the flux trip unit 500 is only located on one side of the operating mechanism 200 in the length direction L, unlike the prior art which is located in the composite direction of the length direction L and the width direction D.

[0058] The handle 203 includes a handle 203a, a main body 203b, and a reset part 203c.

[0059] One end of the handle 203a extends out of the circuit breaker housing 100 for user operation.

[0060] The other end of the handle 203a is connected to the main body 203b. By operating the handle 203a, the main body 203b can be rotated (around the rotation center O between the lever 202 and the frame 201). This rotation can also be described as a rotation along the length L of the molded case circuit breaker.

[0061] The main body 203b includes a first end 203b1 and a second end 203b2. Along the length L of the molded case circuit breaker, the first end 203b1 is further away from the flux trip unit 500 than the second end 203b2. A reset part 203c is connected to the second end 203b2, meaning that the reset part 203c is located between the second end 203b2 and the flux trip unit 500. Thus, when the operating mechanism 200 performs a re-tethering operation, the handle 203 rotates to the open position F, and the reset part 203c can strike the actuation rod 501 of the flux trip unit 500, thereby resetting the flux trip unit 500.

[0062] Here, the imaginary line connecting the first end 203b1 of the main body 203b to the rotation center O is the first connecting line S1, and the imaginary line connecting the reset part 203c to the rotation center O is the second connecting line S2. The length of the second connecting line S2 is greater than the length of the first connecting line S1.

[0063] With this structure, the flux trip unit 500 is positioned only on one side of the operating mechanism 200 along the length L of the molded case circuit breaker. A reset part 203c is added to the second end 203b2 of the handle 203. When the flux trip unit 500 needs to be reset, it is pushed back down via the reset part 203c. This achieves the normal reset of the flux trip unit 500 using the handle 203, while minimizing the increase in the width D dimension of the circuit breaker.

[0064] When the handle 203 is in the closed position N, there is a gap between the reset part 203c and the flux trip unit 500, and at least a portion of the reset part 203c is directly above the traction rod 209 in the height direction H of the molded case circuit breaker.

[0065] This configuration ensures that there is an appropriate distance between the reset unit 203c and the flux trip unit 500, so as to provide sufficient distance for the actuation and reset of the flux trip unit 500.

[0066] Regarding the flux trip unit 500, it includes components such as an actuating rod 501, a coil assembly, and an iron core. The basic principle of its actuation is well-known in the art and will not be elaborated further here. The actuating rod 501 includes a triggering part 501a and a reset part 501b, which are adjacent in the width direction D of the molded case circuit breaker, meaning the triggering part 501a is located on one side of the reset part 501b. In the length direction L of the molded case circuit breaker, the triggering part 501a protrudes beyond the reset part 501b, meaning the triggering part 501a is closer to the traction rod 209 than the reset part 501b. This arrangement ensures that the actuating rod 501, after actuation, can cause the traction rod 209 to rotate. It also ensures that when the operating mechanism 200 performs a re-tethering operation, the reset part 203c can push the reset part 501b of the actuating rod 501 to reset the flux trip unit 500.

[0067] For the reset part 203c, the width of each part of the reset part 203c is smaller than the width of the second end 203b2. This creates a clearance notch S on one side of the reset part 203c, which can avoid the trigger part 501a of the flux trip device 500. This allows for a more compact design of the actuator rod 501 and handle 203, which is beneficial for the miniaturization of the product.

[0068] Here, the size of the reset part 203c can be gradually changed, for example, it can be gradually reduced from a place close to the second end 203b2 to a place far from the second end 203b2.

[0069] For the installation of the magnetic flux trip unit 500, it is fixed by the mounting plate 502. The magnetic flux trip unit 500 is fixed on the mounting plate 502. The fixing method here is screw fastening. Of course, in addition, snap-fit ​​fixing can also be used; or both snap-fit ​​fixing and screw fastening can be used.

[0070] Here, mounting plate 502 is fixed to base 101 using screws. Of course, besides screws, snap-fit ​​or tight-fitting methods can also be used.

[0071] Here, the mounting plate 502 is at least partially embedded in the base 101, and the magnetic flux trip unit 500 is fixed to the mounting plate 502. In this embodiment, the mounting plate 502 is completely embedded above the base 101, so that the magnetic flux trip unit 500 is exactly above the base 101.

[0072] By using this mounting plate 502, the magnetic flux release device 500 is better fixed to the base 101 and positioned above the base 101 opposite to the traction rod 209.

[0073] For a single-phase molded case circuit breaker, there is only one flux trip unit 500, so the flux trip unit 500 is mounted on the mounting plate 502.

[0074] For molded case circuit breakers with two or more phases, there are several options. One option is to have two or more mounting plates 502, with each mounting plate 502 corresponding to a flux trip unit 500, which is then fixed to its respective mounting plate 502. Another option is to have only one mounting plate 502, on which all flux trip units 500 are mounted.

[0075] A controller box 4000 is fixed on the base 101. An adapter circuit board assembly is installed inside the controller box 4000. The controller 400 mentioned above is plugged into the adapter circuit board assembly, which allows the controller 400 to be plugged in and out.

[0076] There are many ways to fix the controller box 4000 to the base 101, such as screw fastening or snap-fit ​​fixing. The controller box 4000 is mostly located above the base 101, extending beyond it. This extension is to accommodate the adapter circuit board assembly. The side of the controller box 4000 facing the operating mechanism 200 has a receiving chamber 400a. Although the magnetic flux trip unit 500 is fixed to the mounting plate 502, it is located within the receiving chamber 400a. This design allows for a very compact structure between the controller box 4000 and the magnetic flux trip unit 500, while also protecting the magnetic flux trip unit 500 from the controller box 4000.

[0077] For a single-phase molded case circuit breaker, its controller box 4000 has only one housing chamber 400a.

[0078] For a molded case circuit breaker with two or more phase lines, it has multiple receiving chambers 400a, such as three in this embodiment. The three receiving chambers 400a are arranged sequentially along the width direction D of the molded case circuit breaker and are adjacent to each other. Here, the controller box 4000 has a second partition rib 401, which is located between two adjacent receiving chambers 400a. The base 101 has a first partition rib 1010 (a partition rib that separates two adjacent phase lines). The first partition rib 1010 and the second partition rib 401 correspond one-to-one and are adjacent to each other, so that two adjacent receiving chambers 400a are separated.

[0079] This setup can increase the creepage distance between adjacent phases.

[0080] Of course, each first partition rib 1010 can form an interlocking structure with the controller box 4000, which can further improve the creepage distance. This interlocking structure can be achieved by providing a protrusion on the first partition rib 1010 and a groove on the controller box 4000 (for example, a groove on the second partition rib 401), where the protrusion is inserted into the groove to form an interlocking structure. Alternatively, the configuration can be interchanged.

[0081] To avoid the handle 203, each receiving chamber 400a has a clearance structure at its opening facing the operating mechanism 200. This clearance structure is designed to avoid the reset part 203c. That is, when the operating mechanism 200 performs a re-clamping operation, the reset part 203c enters the receiving chamber 400a through the clearance structure and pushes the magnetic flux trip unit 500 to reset. Here, the clearance structure is a slope 400b, but it can also be a curved surface.

[0082] Since the base 101 has space to accommodate the main circuit conductor 300, the main circuit conductor 300 must be installed within this space. The controller box 4000 has a first insertion plate portion 400c extending into this space, and the first insertion plate portion 400c is plugged into the base 101. The number of first insertion plate portions 400c is consistent with the number of main circuit conductors 300 and corresponds one-to-one. In this way, after the first insertion plate portion 400c is inserted into the base 101, it can form a first through slot 101s with the base 101, and the first through slot 101s is for the corresponding main circuit conductor 300 to pass through. This structure can improve the insulation performance of the front and rear sides (front and rear sides in the length direction L) of the first insertion plate.

[0083] Although this embodiment uses a three-phase molded case circuit breaker, the method of resetting the handle to the flux trip unit is also applicable to single-phase molded case circuit breakers.

[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. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0085] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

[0086] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0087] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A molded case circuit breaker comprising at least one phase line, each phase line having an operating mechanism and a magnetic flux trip unit corresponding to the operating mechanism, the magnetic flux trip unit actuating to cause the operating mechanism to perform a trip operation; characterized in that: The operating mechanism includes a handle, which is rotationally arranged along a rotation center in the length direction of the MCCB; the handle includes a handle, a main body, and a reset part; one end of the handle is for user operation, and the other end is connected with the main body; in the length direction of the MCCB, the magnetic flux tripping device is arranged on one side of the operating mechanism; the main body includes a first end and a second end, and the second end is closer to the magnetic flux tripping device than the first end; the reset part is connected with the second end and is between the second end and the magnetic flux tripping device; when the operating mechanism performs the reclosing operation, the rotation of the handle causes the reset part to act on the actuated magnetic flux tripping device, so as to reset the magnetic flux tripping device; the first end of the main body and the imaginary line of the rotation center are the first line, and the imaginary line of the reset part and the rotation center is the second line, and the length of the second line is greater than that of the first line.

2. A molded case circuit breaker according to claim 1, wherein: The operating mechanism includes a traction rod, and the magnetic flux tripping device corresponds to the traction rod; after the magnetic flux tripping device is actuated, the traction rod is pushed to rotate, so that the operating mechanism performs the tripping operation; the operating mechanism includes a closed state, an open state, and a tripping state; the handle has a closed position corresponding to the closed state, an open position corresponding to the open state, and a tripping position corresponding to the tripping state; the process of the handle moving from the tripping position to the open position is the reclosing operation of the operating mechanism; when the handle is in the closed position, there is a gap between the reset part and the magnetic flux tripping device, and at least a part of the reset part is directly above the traction rod in the height direction of the MCCB.

3. A molded case circuit breaker according to claim 2, wherein: The magnetic flux tripping device includes an actuating rod, which includes a trigger part and a recovery part; in the width direction of the MCCB, the trigger part is located on one side of the recovery part, and in the length direction of the MCCB, the trigger part protrudes from the recovery part; after the magnetic flux tripping device is actuated, the traction rod is pushed to rotate by the trigger part; when the operating mechanism performs the reclosing operation, the reset part pushes the recovery part of the actuating rod to reset the magnetic flux tripping device.

4. A molded case circuit breaker according to claim 3, wherein: The width of any part of the reset part is smaller than the width of the second end, so that one side of the reset part forms an avoiding gap, which is used to avoid the trigger part.

5. The molded case circuit breaker of claim 1, wherein: The MCCB includes a base and a mounting plate, and the operating mechanism is fixed on the base; the mounting plate is fixed with the base, and at least part of the mounting plate is embedded in the base, and the magnetic flux tripping device is fixed on the mounting plate.

6. A molded case circuit breaker according to claim 5 wherein: The number of operating mechanisms and the number of magnetic flux tripping devices are at least two, and each magnetic flux tripping device is fixed on a corresponding mounting plate or all magnetic flux tripping devices are fixed on the same mounting plate.

7. A molded case circuit breaker according to claim 1 wherein: The controller box is also included, which is fixed with the base; The controller box at least partially protrudes from the base, and the protruding part is provided with a containing chamber, and the magnetic flux tripping device is arranged in the containing chamber.

8. A molded case circuit breaker according to claim 7, wherein: The number of operating mechanisms and the number of magnetic flux tripping devices are at least two, and the containing chambers on the controller box correspond to the number of magnetic flux tripping devices; the base is provided with a first separation rib, and the controller box is provided with a second separation rib, and the first separation rib and the second separation rib jointly separate the two adjacent containing chambers.

9. A molded case circuit breaker according to claim 7 wherein: The accommodating chamber has an opening facing the operating mechanism, and an avoiding structure is arranged on the opening and used for avoiding the reset part; when the operating mechanism performs the reclosing operation, the reset part enters the accommodating chamber through the avoiding structure and pushes the magnetic flux tripping device to reset.

10. The molded case circuit breaker of claim 7, wherein: A plurality of main circuit conductors consistent with the number of phase lines are arranged in the base, the controller box comprises a first plug plate part corresponding to the main circuit conductors, the first plug plate part is in plug-in cooperation with the base and forms a first through slot, and the first through slot is used for penetrating the corresponding main circuit conductor; And / or, the number of phase lines is at least two, a first separation rib is arranged on the base, the first separation rib separates two adjacent phase lines, and the controller box and the first separation rib form a plug-in structure.

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