Protective cover and residual current protection circuit breaker

Abstract

The utility model discloses a protective cover and a residual current protection circuit breaker, and relates to the technical field of circuit breakers, the protective cover is used for protecting a mutual inductor and a thermomagnetic release, and the protective cover comprises a base, a cover body and a barrier. A mounting groove is formed in the base. The cover body is connected to the base, the cover body can seal at least part of the mounting groove to form a mounting cavity, and the mutual inductor and the thermomagnetic release are mounted in the mounting cavity. The blocking piece is arranged in the mounting cavity and comprises a supporting plate, a first partition plate, a second partition plate and a through hole are arranged on the supporting plate, and the first partition plate and the second partition plate are arranged on the two opposite sides of the through hole at intervals. The first conductor is located on the side, away from the second partition plate, of the first partition plate, the second conductor penetrates through the through hole, and the third conductor is located on the side, away from the first partition plate, of the second partition plate. According to the protective cover and the residual current protection circuit breaker provided by the invention, the risk of inter-phase short circuit between conductors of all phases can be reduced.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, specifically to a protective cover and a residual current protection circuit breaker. Background Technology

[0002] Residual current circuit breakers typically consist of a current transformer and multiphase conductors. The multiphase conductors are run through the current transformer, which senses the residual current in the conductors and converts it into a voltage signal. When the voltage signal reaches or exceeds a set threshold, the current transformer triggers the circuit breaker to disconnect the power supply.

[0003] In the existing technology, the conductors of each phase are close to each other when passing through the current transformer. Particles or dust and other impurities generated during the circuit breaker disconnection process may accumulate between the current transformer and the conductors of each phase, which can easily cause phase-to-phase short circuits and is not conducive to the normal operation of equipment and circuits.

[0004] Therefore, there is an urgent need to provide a protective cover and a residual current protection circuit breaker to solve the problems existing in the prior art. Utility Model Content

[0005] The purpose of this application is to provide a protective cover and a residual current protection circuit breaker that can reduce the risk of phase-to-phase short circuits between conductors.

[0006] In a first aspect, embodiments of this application provide a protective cover for protecting a current transformer and a thermomagnetic trip unit. The current transformer has a through hole, and the thermomagnetic trip unit includes a first conductor, a second conductor, and a third conductor, all of which pass through the through hole. The protective cover includes a base, a cover body, and a barrier.

[0007] A mounting groove is provided on the base. A cover is connected to the base and can close at least part of the mounting groove to form a mounting cavity, in which the current transformer and the thermomagnetic trip unit are installed. A barrier is provided in the mounting cavity. The barrier includes a support plate, on which a first partition, a second partition, and a through hole are provided. The first partition and the second partition are spaced apart on opposite sides of the through hole. The first partition and the second partition are inserted into the through hole, and the through hole communicates with the through hole. A first conductor is located on the side of the first partition away from the second partition, a second conductor passes through the through hole, and a third conductor is located on the side of the second partition away from the first partition.

[0008] The combination of the base and the enclosure forms a structurally stable and insulating mounting cavity. Installing the current transformer and thermal-magnetic trip unit within this cavity reduces the impact of particulate matter generated during circuit breaking. Simultaneously, by incorporating barrier components within the mounting cavity, with first and second partitions separating the first, second, and third conductors, particulate matter accumulation in the transformer's vias prevents phase-to-phase short circuits between the first, second, and third conductors, effectively improving the functional stability and operational safety of the residual current circuit breaker.

[0009] In some examples, the first partition is provided with a first extension section and a second extension section, which are spaced apart on the side of the first partition away from the second partition. The first extension section and the second extension section enclose the first partition to form a first protective groove, and the first conductor portion is located in the first protective groove.

[0010] The first protective groove is formed by the first extension section and the second extension section enclosing the first partition plate, which can protect the first conductor located in the transformer through hole, further improve the insulation effect of the barrier, and reduce the risk of phase-to-phase short circuit.

[0011] In some examples, the second partition is provided with a third extension and a fourth extension, which are spaced apart on the side of the second partition away from the first partition. The third extension and the fourth extension enclose the second partition to form a second protective groove, and the third conductor portion is located in the second protective groove.

[0012] Similar to the first partition, the second protective groove is formed by the arrangement of the third and fourth extension sections on the second partition. This groove can protect the third conductor located in the transformer via, further reducing the risk of phase-to-phase short circuits caused by particulate matter accumulating between the first, second, and third conductors.

[0013] In some examples, a third partition is also provided on the support plate, which is adjacent to the first and second partitions. The third partition is inserted into a through hole. The thermomagnetic trip unit also includes a fourth conductor that can pass through the through hole from the side of the third partition away from the first and second partitions.

[0014] The third partition can further divide the space in the via for the fourth conductor. This separates the first, second, third and fourth conductors in the via, thereby improving the insulation performance between the phase conductors and reducing the risk of phase-to-phase short circuits.

[0015] In some examples, the barrier also includes a first mounting foot and a second mounting foot, with a first partition boss and a second partition boss spaced apart in the mounting groove. A first positioning groove is provided on the first partition boss, and a second positioning groove is provided on the second partition boss. The first mounting foot is connected to the first positioning groove, and the second mounting foot is connected to the second positioning groove.

[0016] The barrier is connected to the first positioning groove via the first mounting foot and to the second positioning groove via the second mounting foot. This allows the barrier to be positioned and installed on the base, improving the assembly stability of the barrier on the base. This helps maintain a stable assembly relationship between the barrier and the current transformer, thus achieving accurate isolation. At the same time, it avoids the problem of the current transformer becoming loose due to unstable installation of the barrier, thereby ensuring a stable interval between the first conductor, second conductor, third conductor, and fourth conductor in the current transformer.

[0017] In some examples, the cover is provided with a first insulating plate and a second insulating plate, the first insulating plate being opposite to a first separating boss, and the second insulating plate being opposite to a second separating boss. The mounting cavity includes a first cavity, a second cavity, and a third cavity. The first cavity and the second cavity are separated by the first insulating plate and the first separating boss, and the second cavity and the third cavity are separated by the second insulating plate and the second separating boss. The portion of the first conductor protruding from the through hole is located in the first cavity, the portion of the second conductor protruding from the through hole is located in the second cavity, and the portion of the third conductor protruding from the through hole is located in the third cavity.

[0018] By dividing the mounting cavity into adjacent first, second, and third cavities, which respectively accommodate the first, second, and third conductors extending from the via, the portions of the first, second, and third conductors outside the via can be isolated from each other, further reducing the risk of phase-to-phase short circuits.

[0019] In some examples, the barrier also includes a first side plate and a second side plate, which are disposed opposite to each other on both sides of the support plate. The first side plate corresponds to the first insulating plate and the first partition boss, and the second side plate corresponds to the second insulating plate and the second partition boss.

[0020] The first side plate, together with the first insulating plate and the first partition boss, can further separate the first cavity and the second cavity. The second side plate, together with the second insulating plate and the second partition boss, can further separate the second cavity and the third cavity. This can make the isolation effect between multiple cavities stronger and effectively prevent the conductors in each cavity from interfering with each other.

[0021] In some examples, a third partition boss is also provided in the mounting slot, and a wiring groove is provided on the third partition boss. A third insulating plate corresponding to the third partition boss is provided on the cover. The third partition boss and the third insulating plate separate the third cavity and the fourth cavity. The fourth conductor can extend into the fourth cavity through the wiring groove.

[0022] The fourth cavity is formed to accommodate the fourth conductor. The fourth cavity can isolate the part of the fourth conductor that extends out of the through hole and is far away from the current transformer from the third conductor, reducing the risk of phase-to-phase short circuit between the fourth conductor and the third conductor due to excessive distance.

[0023] In some examples, the base is provided with at least one first positioning part and at least one first snap-fit ​​part, and the cover is provided with at least one second positioning part and at least one second snap-fit ​​part, wherein the first positioning part and the second positioning part are correspondingly connected, and the first snap-fit ​​part and the second snap-fit ​​part are correspondingly snap-fitted.

[0024] The cooperation of the first and second positioning parts serves to position the base and cover during assembly, ensuring accurate and smooth assembly. The snap-fit ​​of the first and second locking parts achieves a fixed connection between the base and cover, providing a stable structure for the protective cover and ensuring reliable protection for the current transformer and thermomagnetic trip unit.

[0025] Secondly, embodiments of this application also provide a residual current protection circuit breaker, including a current transformer, a thermal-magnetic trip unit, and the aforementioned protective cover, wherein both the current transformer and the thermal-magnetic trip unit are installed in the protective cover.

[0026] The protective cover provided in this embodiment can protect the current transformer and the thermal-magnetic trip unit, reduce the risk of phase-to-phase short circuit caused by other factors affecting the current transformer and the thermal-magnetic trip unit in the base, improve the coordination stability of the current transformer and the thermal-magnetic trip unit, and ensure that the residual current protection circuit breaker can maintain normal operation. Attached Figure Description

[0027] 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.

[0028] Figure 1 One of the exploded views of the residual current protection circuit breaker provided in the embodiments of this application.

[0029] Figure 2 The second exploded view of the residual current protection circuit breaker provided in the embodiments of this application.

[0030] Figure 3 An exploded view of the protective cover provided in an embodiment of this application.

[0031] Figure 4 A schematic diagram of the current transformer and thermomagnetic trip unit installed in the base according to an embodiment of this application.

[0032] Figure 5 This is a schematic diagram of the structure of the base provided in an embodiment of this application.

[0033] Figure 6 This is a schematic diagram of the structure of the cover provided in an embodiment of this application.

[0034] Figure 7 This is a schematic diagram of the barrier provided in an embodiment of this application.

[0035] Figure 8 This is a schematic diagram showing the assembly state of the barrier, current transformer, and thermomagnetic trip unit provided in the embodiments of this application.

[0036] Figure 9 This is a schematic diagram of the combined structure of the protective cover provided in the embodiments of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100. Residual Current Circuit Breaker; 1. Current Transformer; 11. Through Hole; 2. Thermal-Magnetic Trip Unit; 21. First Conductor; 22. Second Conductor; 23. Third Conductor; 24. Fourth Conductor; 3. Protective Cover; 31. Base; 311. Mounting Slot; 312. Bottom Wall; 313. Clearance Opening; 314. First Separating Boss; 3141. First Positioning Slot; 315. Second Separating Boss; 3151. Second Positioning Slot; 316. Third Separating Boss; 3161. Wiring Slot; 317. First Positioning Part; 318. First Snap-fit ​​Part; 32. Cover; 321. Top Cover; 322. Side Cover; 323. 324. First insulating plate; 325. Second insulating plate; 326. Third insulating plate; 327. Second positioning part; 328. Second snap-fit ​​part; 33. Barrier component; 331. Support plate; 332. First partition; 3321. First extension section; 3322. Second extension section; 3323. First protrusion; 333. Second partition; 3331. Third extension section; 3332. Fourth extension section; 3333. Second protrusion; 334. Through hole; 335. Third partition; 336. First mounting foot; 337. Second mounting foot; 338. First side plate; 339. Second side plate; 4. Base; 5. Cover. Detailed Implementation

[0039] 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, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for 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. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] Residual current protection circuit breakers generally include current transformers and thermal-magnetic trip units. The thermal-magnetic trip unit is connected to multi-phase conductors, which are all run through the current transformer. The current transformer can sense the current changes in the multi-phase conductors and control the circuit breaker to disconnect the circuit in a timely manner.

[0045] However, in actual use, because the multiphase conductors are close together at the point where they pass through the current transformer, the residual current circuit breaker will generate some particulate impurities during the breaking process. These impurities are easy to accumulate in the gap between the multiphase conductors and the current transformer, which can easily cause phase-to-phase short circuits and affect the safety of circuit and equipment use.

[0046] Based on this, the present application provides a protective cover and a residual current protection circuit breaker, which can reduce the risk of phase-to-phase short circuits between conductors.

[0047] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0048] Figure 1 This is one of the exploded views of the residual current protection circuit breaker provided in the embodiments of this application. Figure 2 The second exploded view of the residual current protection circuit breaker provided in the embodiments of this application. Figure 3 An exploded view of the protective shield provided in an embodiment of this application. (In conjunction with...) Figure 1 , Figure 2 and Figure 3 This application provides a residual current protection circuit breaker 100, including a current transformer 1, a thermomagnetic trip unit 2, and the aforementioned protective cover 3. Both the current transformer 1 and the thermomagnetic trip unit 2 are installed on the protective cover 3.

[0049] The current transformer 1 is typically ring-shaped, with a through-hole 11 in the middle to allow conductors to pass through it. The thermal-magnetic trip unit 2 can be in various forms, including three-phase or four-phase conductors. Taking a three-phase conductor thermal-magnetic trip unit 2 as an example, it can include a first conductor 21, a second conductor 22, and a third conductor 23, all of which pass through the through-hole 11. Additionally, the residual current circuit breaker 100 includes a base 4 and a cover 5. The current transformer 1 and the thermal-magnetic trip unit 2 are mounted in a protective cover 3 and integrally mounted onto the base 4.

[0050] The protective cover 3 provided in this embodiment can protect the current transformer 1 and the thermal-magnetic trip unit 2, reduce the risk of phase-to-phase short circuit caused by other factors affecting the current transformer 1 and the thermal-magnetic trip unit 2 in the base 4, improve the coordination stability of the current transformer 1 and the thermal-magnetic trip unit 2, and ensure that the residual current protection circuit breaker 100 can maintain normal operation.

[0051] The specific structure of the protective cover 3 provided in this application will be described in detail below with reference to the accompanying drawings.

[0052] like Figure 3 and Figure 4As shown, the protective cover 3 provided in this embodiment includes a base 31, a cover body 32, and a barrier 33. The base 31 has a mounting groove 311. The cover body 32 is connected to the base 31, and the cover body 32 can close at least part of the mounting groove 311 to form a mounting cavity, in which the current transformer 1 and the thermomagnetic trip unit 2 are installed. The barrier 33 is disposed within the mounting cavity and includes a support plate 331. The support plate 331 has a first partition 332, a second partition 333, and a through hole 334. The first partition 332 and the second partition 333 are spaced apart on opposite sides of the through hole 334. The first partition 332 and the second partition 333 are inserted into the through hole 11. The through hole 334 is connected to the through hole 11. The first conductor 21 is located on the side of the first partition 332 away from the second partition 333. The second conductor 22 passes through the through hole 334. The third conductor 23 is located on the side of the second partition 333 away from the first partition 332.

[0053] The base 31 and the cover 32 cooperate to form a structurally stable and insulating mounting cavity. Installing the current transformer 1 and the thermomagnetic trip unit 2 within this cavity reduces the impact of particulate matter generated during circuit breaking. Simultaneously, by providing a barrier 33 within the mounting cavity, and separating the first conductor 21, the second conductor 22, and the third conductor 23 via the first and second partitions 332, particulate matter can be prevented from accumulating in the through-hole 11 of the current transformer 1, thus preventing phase-to-phase short circuits between the first conductor 21, the second conductor 22, and the third conductor 23. This effectively improves the functional stability and operational safety of the residual current circuit breaker 100.

[0054] Specifically, refer to Figure 5 The base 31 is provided with a mounting groove 311. During the assembly process, the current transformer 1 and the thermomagnetic trip unit 2 can be installed in the mounting groove 311 first, and then the cover 32 can be connected to the base 31 so that the current transformer 1 and the thermomagnetic trip unit 2 are in the enclosed mounting cavity, so as to achieve the protection of the current transformer 1 and the thermomagnetic trip unit 2.

[0055] The base 31 includes a bottom wall 312 and four side walls arranged around the bottom wall 312. The mounting groove 311 is formed by the four side walls and the bottom wall 312. One of the side walls has an avoidance opening 313 for corresponding to the wiring position on the base 4 of the residual current protection circuit breaker 100 so that the thermal magnetic trip unit 2 can be connected to the external circuit.

[0056] Reference Figure 6The cover 32 includes an upper cover 321 and a side cover 322. The upper cover 321 is opposite to the bottom wall 312 of the base 31 to close the opening in the mounting groove 311 opposite to the bottom wall 312. The side cover 322 can cooperate with the side wall of the base 31 that is provided with a clearance opening 313 to close part of the clearance opening 313. Without affecting the wiring of the first conductor 21, the second conductor 22 and the third conductor 23 extending out of the protective cover 3 and the base 4, it can act as an insulating partition to block the external environment, reduce the impact of external factors on the insulation effect between the first conductor 21, the second conductor 22 and the third conductor 23, and save the material consumption of setting an insulating partition separately between the base 4 and the protective cover 3, so as to save manufacturing and assembly costs.

[0057] The barrier 33 is disposed in the mounting groove 311. The barrier 33 can be positioned and installed in the mounting groove 311 using various positioning or fixed connection methods to provide a stable barrier effect, such as snap-fit ​​or fastening connection. The barrier 33 includes a support plate 331. The direction of the support plate 331 is the same as the direction of the vertical bottom wall 312, so that the support plate 331 can provide support perpendicular to the bottom wall 312, and the support plate 331 is parallel to the side wall where the clearance opening 313 is opened.

[0058] Reference Figure 7 and Figure 8 The support plate 331 is provided with a first partition 332, a second partition 333, and a through hole 334. The through hole 334 is located in the middle of the support plate 331. The first partition 332 is positioned based on the support plate 331 towards the clearance opening 313, and is perpendicular to the bottom wall 312 of the base 31. The second partition 333 is parallel to the first partition 332. The first partition 332 and the second partition 333 are inserted into the through hole 11 of the current transformer 1. They can separate the first conductor 21, the second conductor 22, and the third conductor 23, and also provide fixation and support for the current transformer 1 by abutting against the hole wall of the through hole 11, thereby improving the assembly stability of the current transformer 1.

[0059] In the via 11 of the current transformer 1, the position where the via 11 connects with the through hole 334 is used to pass through the second conductor 22. The space enclosed by the side of the first partition 332 away from the second partition 333 and the via 11 is used to pass through the first conductor 21. The space enclosed by the side of the second partition 333 away from the first partition 332 and the via 11 is used to pass through the third conductor 23. By dividing the space in the via 11 into three parts and accommodating the three conductors respectively, the three conductors can maintain phase-to-phase insulation even if they are close to each other at the position where they pass through the via 11, thereby reducing the risk of failure of the residual current protection circuit breaker 100.

[0060] like Figure 7 and Figure 8As shown, in some examples, a first extension 3321 and a second extension 3322 are provided on the first partition 332. The first extension 3321 and the second extension 3322 are spaced apart on the side of the first partition 332 away from the second partition 333. The first extension 3321 and the second extension 3322 enclose the first partition 332 to form a first protective groove, and the first conductor 21 is partially located in the first protective groove.

[0061] The first protective groove is formed by the first extension section 3321 and the second extension section 3322 enclosing the first partition plate 332, which can protect the part of the first conductor 21 in the through hole 11 of the current transformer 1, further improve the insulation effect of the barrier 33, and reduce the risk of phase-to-phase short circuit.

[0062] Specifically, the first extension section 3321 and the second extension section 3322 are disposed opposite to each other on the two sides of the first partition 332, and are both located on the side of the first partition 332 away from the second partition 333. The first extension section 3321 and the second extension section 3322 cooperate with the first partition 332 to form a U-shaped groove. In this way, the first conductor 21 can be protected in multiple directions in the space enclosed by the first partition 332 and the hole wall of the through hole 11, further enhancing the isolation effect on the first conductor 21.

[0063] In addition, a first protrusion 3323 is provided on the first partition 332. The first protrusion 3323 is located at the end of the first partition 332 away from the support plate 331. The first protrusion 3323 protrudes outward from the through hole 11 and can isolate the first conductor 21 and the second conductor 22 that are outside and close to the through hole 11, thereby enhancing the blocking effect of the first partition 332.

[0064] like Figure 7 and Figure 8 As shown, in some examples, the second partition 333 is provided with a third extension 3331 and a fourth extension 3332. The third extension 3331 and the fourth extension 3332 are spaced apart on the side of the second partition 333 away from the first partition 332. The third extension 3331 and the fourth extension 3332 enclose the second partition 333 to form a second protective groove, and the third conductor 23 is partially located in the second protective groove.

[0065] Similar to the first partition 332, the second protective groove is formed by the arrangement of the third extension section 3331 and the fourth extension section 3332 on the second partition 333, which can protect the part of the third conductor 23 in the through hole 11 of the current transformer 1, and further reduce the risk of phase-to-phase short circuit caused by the accumulation of particulate matter between the first conductor 21, the second conductor 22 and the third conductor 23.

[0066] The third extension segment 3331 and the fourth extension segment 3332 provided on the second partition 333 are the same as the first extension segment 3321 and the second extension segment 3322 on the first partition 332. The third extension segment 3331 and the fourth extension segment 3332 are provided on both sides of the second partition 333, and are both located on the side of the second partition 333 away from the first partition 332. The third extension segment 3331 and the fourth extension segment 3332, together with the second partition 333, also form a U-shaped groove, which can play a multi-directional protective role for the third conductor 23 in the space enclosed by the second partition 333 and the hole wall of the through hole 11, further enhancing the isolation effect on the third conductor 23.

[0067] Similarly, a second protrusion 3333 is provided on the second partition 333. The second protrusion 3333 is located at the end of the second partition 333 away from the support plate 331. The second protrusion 3333 protrudes outward from the through hole 11 and can isolate the third conductor 23 and the second conductor 22 that are outside and close to the through hole 11, thereby enhancing the blocking effect of the second partition 333.

[0068] Reference Figure 7 and Figure 8 In some examples, a third partition 335 is also provided on the support plate 331. The third partition 335 is adjacent to the first partition 332 and the second partition 333. The third partition 335 is inserted into the through hole 11. The thermomagnetic trip unit 2 also includes a fourth conductor 24, which can pass through the through hole 11 from the side of the third partition 335 away from the first partition 332 and the second partition 333.

[0069] The third partition 335 can further divide the space in the via 11 for the fourth conductor 24 to pass through. In this way, the first conductor 21, the second conductor 22, the third conductor 23 and the fourth conductor 24 passing through the via 11 can be separated to improve the insulation performance between the phase conductors and reduce the risk of phase-to-phase short circuit.

[0070] The third partition 335 is disposed on the support plate 331 adjacent to the first partition 332 and the second partition 333. Specifically, it is located on the side of the first partition 332 and the second partition 333 away from the bottom wall 312 of the base 31, and is located between the first partition 332 and the second partition 333. It is on the same plane as the first extension section 3321 and the third extension section 3331.

[0071] The third partition 335 is isolated from the space formed by the third partition plate 335 and part of the hole wall in the via 11 from the space where the first conductor 21, the second conductor 22 and the third conductor 23 are located. The fourth conductor 24 passes through the via 11 through this space to avoid phase-to-phase short circuits due to being too close to other conductors.

[0072] When the thermomagnetic trip unit 2 is configured to have four-phase conductors, the fourth conductor 24 is usually an N-phase conductor, and the fourth conductor 24 can pass through the via 11 in the form of a wire. The third partition 335 is provided with a clearance notch, which facilitates the passage of the fourth conductor 24.

[0073] Reference Figure 5 and Figure 7 In some examples, the barrier 33 further includes a first mounting foot 336 and a second mounting foot 337. A first partition boss 314 and a second partition boss 315 are provided at intervals in the mounting groove 311. A first positioning groove 3141 is provided on the first partition boss 314, and a second positioning groove 3151 is provided on the second partition boss 315. The first mounting foot 336 is connected to the first positioning groove 3141, and the second mounting foot 337 is connected to the second positioning groove 3151.

[0074] The barrier 33 is connected to the first positioning groove 3141 via the first mounting foot 336 and to the second positioning groove 3151 via the second mounting foot 337. This allows the barrier 33 to be positioned and installed on the base 31, thereby improving the assembly stability of the barrier 33 on the base 31. This is beneficial for maintaining a stable assembly relationship between the barrier 33 and the current transformer 1, thus achieving accurate blocking. At the same time, it avoids the problem of the current transformer 1 becoming loose due to the unstable installation of the barrier 33. This also ensures that the portions of the first conductor 21, the second conductor 22, the third conductor 23, and the fourth conductor 24 in the current transformer 1 maintain a stable interval.

[0075] The first mounting foot 336 and the second mounting foot 337 are spaced apart on the side of the support plate 331 near the bottom wall 312 of the base 31. The first mounting foot 336 and the second mounting foot 337 are positioned in a direction that extends from the support plate 331 toward the side wall where the clearance opening 313 is provided. This increases the contact area with the bottom wall 312, allowing the barrier 33 to maintain stable assembly in the mounting groove 311.

[0076] The first dividing boss 314 and the second dividing boss 315 are spaced apart on the bottom wall 312 of the base 31. The first positioning groove 3141 is formed on the top of the first dividing boss 314, and the second positioning groove 3151 is formed on the top of the second dividing boss 315. The first positioning groove 3141 matches the shape of the first mounting foot 336, and the second positioning groove 3151 matches the shape of the second mounting foot 337. The first mounting foot 336 is inserted into the first positioning groove 3141, and the second mounting foot 337 is inserted into the second positioning groove 3151, so that the blocking member 33 can be positioned and installed in the mounting groove 311. At the same time, the current transformer 1 installed on the blocking member 33 can be kept stably assembled in the mounting groove 311.

[0077] Specifically, such as Figure 5and Figure 7 As shown, the first mounting foot 336 and the second mounting foot 337 are configured as plate-like structures. The first positioning groove 3141 and the second positioning groove 3151 are elongated grooves. The plate-like first mounting foot 336 not only provides support within the elongated first positioning groove 3141, but also clamps the first mounting foot 336 through the groove wall of the first positioning groove 3141, which improves the support effect and connection stability. The second mounting foot 337 and the second positioning groove 3151 are similarly configured, and will not be described in detail here.

[0078] In one alternative embodiment, there may be two or more mounting feet and two or more corresponding positioning slots. The cooperation between the two or more mounting feet and positioning slots helps to further improve assembly stability.

[0079] Reference Figure 6 , Figure 7 and Figure 9 In some examples, the cover 32 is provided with a first insulating plate 323 and a second insulating plate 324. The first insulating plate 323 is opposite to the first separating boss 314, and the second insulating plate 324 is opposite to the second separating boss 315. The mounting cavity includes a first cavity, a second cavity, and a third cavity. The first cavity and the second cavity are separated by the first insulating plate 323 and the first separating boss 314, and the second cavity and the third cavity are separated by the second insulating plate 324 and the second separating boss 315. The portion of the first conductor 21 extending out of the through hole 11 is located in the first cavity, the portion of the second conductor 22 extending out of the through hole 11 is located in the second cavity, and the portion of the third conductor 23 extending out of the through hole 11 is located in the third cavity.

[0080] By dividing the mounting cavity into adjacent first cavity, second cavity and third cavity, respectively accommodating the first conductor 21, second conductor 22 and third conductor 23 extending out of the via 11, the portions of the first conductor 21, second conductor 22 and third conductor 23 outside the via 11 can be isolated from each other, further reducing the risk of phase-to-phase short circuit.

[0081] The first insulating plate 323 and the second insulating plate 324 are disposed between the upper cover 321 and the side cover 322 of the cover 32. One side of the first insulating plate 323 abuts against the upper cover 321 and the adjacent side abuts against the side cover 322. The second insulating plate 324 is the same.

[0082] like Figure 5 , Figure 6 and Figure 9As shown, the first insulating plate 323 is perpendicular to the upper cover 321, the side cover 322, and the bottom wall 312 of the base 31. The first insulating plate 323 corresponds to the first partition boss 314 on the bottom wall 312. The first insulating plate 323 and the first partition boss 314 cooperate to divide the mounting cavity into a first cavity and a second cavity. The second insulating plate 324 is arranged parallel to the first insulating plate 323. The second insulating plate 324 corresponds to the second partition boss 315 on the bottom wall 312. The second insulating plate 324 and the second partition boss 315 cooperate to divide the mounting cavity into a second cavity and a third cavity.

[0083] The first cavity is used to accommodate the first conductor 21 extending out of the through hole 11 of the current transformer 1, the second cavity is used to accommodate the second conductor 22 extending out of the through hole 11 of the current transformer 1, and the third cavity is used to accommodate the third conductor 23 extending out of the through hole 11 of the current transformer 1. In this way, the conductors of each phase can be isolated from the current transformer 1, further reducing the risk of phase-to-phase short circuit between the conductors and improving the operational stability of the residual current protection circuit breaker 100.

[0084] In addition, a first clearance groove is provided on the first insulating plate 323 and a second clearance groove is provided on the second insulating plate 324. The first clearance groove and the second clearance groove are provided to avoid and assist in positioning the current transformer 1. They can play a positioning role in the assembly of the current transformer 1 without affecting the separation effect.

[0085] Reference Figure 7 and Figure 9 In some examples, the barrier 33 also includes a first side plate 338 and a second side plate 339, which are disposed opposite to each other on both sides of the support plate 331. The first side plate 338 corresponds to the first insulating plate 323 and the first partition boss 314, and the second side plate 339 corresponds to the second insulating plate 324 and the second partition boss 315.

[0086] The first side plate 338 can work with the first insulating plate 323 and the first dividing boss 314 to further separate the first cavity and the second cavity. The second side plate 339 can work with the second insulating plate 324 and the second dividing boss 315 to further separate the second cavity and the third cavity. This can make the isolation effect between multiple cavities stronger and effectively avoid the conductors in each cavity from interfering with each other.

[0087] Specifically, the first side plate 338 and the second side plate 339 are disposed opposite to each other on the two sides of the support plate 331. The first side plate 338 is on the same plane as the first mounting foot 336, and the second side plate 339 is on the same plane as the second mounting foot 337. The side of the first side plate 338 closest to the first mounting foot 336 is installed in the first positioning groove 3141 together with the first mounting foot 336, and the side of the second side plate 339 closest to the second mounting foot 337 is installed in the second positioning groove 3151 together with the second mounting foot 337. This allows the first side plate 338 to work with the first partition boss 314 to separate the first cavity and the second cavity, and the second side plate 339 to work with the second partition boss 315 to separate the second cavity and the third cavity, thereby enhancing the isolation effect within the mounting cavity.

[0088] Meanwhile, the side of the first side plate 338 away from the first mounting foot 336 is close to the first insulating plate 323. The first side plate 338, the first insulating plate 323 and the first separating boss 314 work together to effectively separate the first cavity and the second cavity. The side of the second side plate 339 away from the second mounting foot 337 is close to the second insulating plate 324. The second side plate 339, the second insulating plate 324 and the second separating boss 315 work together to effectively separate the second cavity and the third cavity, further enhancing the separation effect between the phase conductors.

[0089] Reference Figure 5 , Figure 6 and Figure 9 In some examples, a third partition boss 316 is also provided in the mounting groove 311. A wiring groove 3161 is provided on the third partition boss 316. A third insulating plate 325 corresponding to the third partition boss 316 is provided on the cover 32. The third partition boss 316 and the third insulating plate 325 separate the third cavity and the fourth cavity. The fourth conductor 24 can extend into the fourth cavity through the wiring groove 3161.

[0090] The fourth cavity is formed to accommodate the fourth conductor 24. The fourth cavity can isolate the part of the fourth conductor 24 that extends out of the through hole 11 and is far away from the current transformer 1 from the third conductor 23, thereby reducing the risk of phase-to-phase short circuit between the fourth conductor 24 and the third conductor 23 due to the close distance.

[0091] The third dividing boss 316 is spaced apart on the side of the second dividing boss 315 away from the first dividing boss 314, and the third insulating plate 325 is spaced apart on the side of the second insulating plate 324 away from the first insulating plate 323. The third insulating plate 325 corresponds to the third insulating boss to separate the third cavity in the mounting cavity. The third cavity is correspondingly accommodated to accommodate the part of the fourth conductor 24 that extends out of the through hole 11 of the current transformer 1, so as to separate the fourth conductor 24 from the third conductor 23 and prevent phase-to-phase short circuit between the third conductor 23 and the fourth conductor 24.

[0092] The third dividing boss 316 extends from the bottom wall 312 of the base 31 to abut against the third insulating plate 325, thus providing a better barrier effect between the second cavity and the third cavity. The wiring groove 3161 provided on the third dividing boss 316 is used for the passage of the fourth conductor 24, thereby maximizing the barrier effect between the second cavity and the third cavity without affecting the passage of the fourth conductor 24 through the current transformer 1.

[0093] Reference Figure 5 , Figure 6 and Figure 9 In some examples, the base 31 is provided with at least one first positioning part 317 and at least one first snap-fit ​​part 318, and the cover 32 is provided with at least one second positioning part 326 and at least one second snap-fit ​​part 327. The first positioning part 317 is connected to the second positioning part 326, and the first snap-fit ​​part 318 is snap-fitted to the second snap-fit ​​part 327.

[0094] The cooperation of the first positioning part 317 and the second positioning part 326 can play a positioning role when assembling the base 31 and the cover 32, so that the base 31 and the cover 32 can be accurately and smoothly assembled. The snap-fit ​​of the first snap-fit ​​part 318 and the second snap-fit ​​part 327 can realize the fixed connection between the base 31 and the cover 32, so that the protective cover 3 has a stable structure and can provide stable protection for the current transformer 1 and the thermomagnetic trip unit 2.

[0095] The first positioning part 317 is a groove formed on the side wall of the base 31, and the second positioning part 326 is a boss provided on the side of the cover 32. During the assembly process of the base 31 and the cover 32, the first positioning part 317 and the second positioning part 326 can be aligned first to determine the assembly direction, which is conducive to quick and accurate assembly. The first positioning part 317 can be provided in one, two, or more forms, and the second positioning part 326 can be provided in a one-to-one correspondence with the first positioning part 317.

[0096] The first snap-fit ​​part 318 is a snap-fit ​​hole formed on the side wall of the base 31, and the second snap-fit ​​part 327 is an elastic buckle provided on the side of the cover 32. During the assembly of the base 31 and the cover 32, the elastic buckle can snap into the snap-fit ​​hole, thereby fixing the base 31 and the cover 32. There can be two or more first snap-fit ​​parts 318, which are arranged opposite to each other on the two side walls of the base 31. The second snap-fit ​​parts 327 are arranged one-to-one with the first snap-fit ​​parts 318. This arrangement helps to improve the connection stability between the base 31 and the cover 32, and ensures the structural stability of the protective cover 3.

[0097] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A protective cover, characterized in that, A protective cover for protecting a mutual inductor and a thermal magnetic release, the mutual inductor having a through hole, the thermal magnetic release including a first conductor, a second conductor and a third conductor, the first conductor, the second conductor and the third conductor each passing through the through hole, the protective cover comprising: a base provided with a mounting groove; a cover body connected to the base and capable of enclosing at least part of the mounting groove to form a mounting cavity, the mutual inductor and the thermal magnetic release being mounted in the mounting cavity; a barrier provided in the mounting cavity, the barrier including a support plate provided with a first partition plate, a second partition plate and a through hole, the first partition plate and the second partition plate being arranged at opposite sides of the through hole; the first partition plate and the second partition plate being inserted into the through hole, the through hole being in communication with the through hole, the first conductor being located on a side of the first partition plate away from the second partition plate, the second conductor passing through the through hole, and the third conductor being located on a side of the second partition plate away from the first partition plate.

2. The boot claimed in claim 1, wherein the first partition plate is provided with a first extension and a second extension, the first extension and the second extension being arranged at a side of the first partition plate away from the second partition plate, the first extension and the second extension enclosing a first protection groove on the first partition plate, and part of the first conductor being located in the first protection groove.

3. The boot claimed in claim 2, wherein the second partition plate is provided with a third extension and a fourth extension, the third extension and the fourth extension being arranged at a side of the second partition plate away from the first partition plate, the third extension and the fourth extension enclosing a second protection groove on the second partition plate, and part of the third conductor being located in the second protection groove.

4. The boot claimed in claim 3, wherein the support plate is further provided with a third partition plate adjacent to the first partition plate and the second partition plate, the third partition plate being inserted into the through hole, and the thermal magnetic release further including a fourth conductor capable of passing through the through hole from a side of the third partition plate away from the first partition plate and the second partition plate.

5. The shield of any one of claims 1-4, wherein, the barrier further includes a first mounting leg and a second mounting leg, the mounting groove is provided with a first partition boss and a second partition boss arranged at intervals, the first partition boss is provided with a first positioning groove, the second partition boss is provided with a second positioning groove, the first mounting leg is connected to the first positioning groove, and the second mounting leg is connected to the second positioning groove.

6. The bootleg shield of claim 5, wherein, the cover body is provided with a first insulation plate and a second insulation plate, the first insulation plate is opposite to the first partition boss, and the second insulation plate is opposite to the second partition boss; the mounting cavity includes a first cavity, a second cavity and a third cavity, the first cavity and the second cavity are separated by the first insulation plate and the first partition boss, and the second cavity and the third cavity are separated by the second insulation plate and the second partition boss; part of the first conductor protruding from the through hole is located in the first cavity, part of the second conductor protruding from the through hole is located in the second cavity, and part of the third conductor protruding from the through hole is located in the third cavity.

7. The bootleg shield of claim 6, wherein, The barrier further comprises a first side plate and a second side plate, which are oppositely arranged on two sides of the support plate, the first side plate corresponds to the first insulation plate and the first partition boss, and the second side plate corresponds to the second insulation plate and the second partition boss.

8. The bootleg shield of claim 6, wherein, The mounting groove is further provided with a third partition boss, the third partition boss is provided with a wiring groove, the cover body is provided with a third insulation plate corresponding to the third partition boss, and the third partition boss and the third insulation plate separate the third cavity and a fourth cavity, and a fourth conductor can extend into the fourth cavity through the wiring groove.

9. The bootleg shield of claim 1, wherein, The base is provided with at least one first positioning part and at least one first clamping part, the cover body is provided with at least one second positioning part and at least one second clamping part, the first positioning part is connected with the second positioning part in correspondence, and the first clamping part is clamped with the second clamping part in correspondence.

10. A residual current circuit breaker, characterized in that The protective cover is used for protecting the transformer and the thermal magnetic release, and the protective cover comprises a base and a cover body, the base is provided with a first cavity, the cover body is provided with a second cavity, and the first cavity and the second cavity are separated by a partition.

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