A leakage current transformer installation structure

Abstract

This utility model discloses a leakage current transformer installation structure, including a circuit breaker body and a transformer module. The transformer module is fixed by two sets of installation components: the first installation component includes an upper connecting part and an upper positioning groove of the circuit breaker body and an upper positioning platform of the transformer module. After the upper positioning platform and the upper positioning groove are positioned and connected, the module is fixed by a first connecting shaft passing through the upper guide hole; the second installation component includes a lower connecting part of the circuit breaker body, a lower positioning groove, and a lower positioning platform of the transformer module. After the lower positioning platform and the lower positioning groove are positioned and connected, the module is fixed by a second connecting shaft passing through the lower guide hole. The transformer module designed with this structure can better accommodate the installation requirements of multi-unit circuit breakers. The entire installation structure forms a multi-point fixation at the top and bottom, with uniform stress distribution and strong connection stability. This significantly reduces the installation difficulty and time cost for operators, and improves assembly efficiency and product consistency.

Description

Technical Field

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

[0002] A residual current circuit breaker (RCCB) is an electrical protection device widely used in low-voltage power distribution systems. It primarily detects leakage current in a circuit and quickly cuts off power in the event of a leakage fault, preventing electric shock and electrical fires. In the design and manufacture of RCCBs, to achieve modular functionality and facilitate production assembly, a common structure integrates the zero-sequence current transformer and its related current-carrying components and terminals into a single housing, forming an independent transformer module. This transformer module is typically suspended or attached to the outgoing terminal side of the circuit breaker body like a backpack; therefore, this structure is often referred to as a "backpack-style" transformer mounting structure.

[0003] This backpack-style design aims to modularize the leakage current detection function, allowing for flexible compatibility with circuit breaker modules of different specifications or models, thus improving production line versatility and assembly efficiency. However, in actual installation, the connection between this backpack-style instrument transformer module and the circuit breaker module typically relies on clips on the plastic housing and a small number of screws for mechanical fixing. During assembly, operators need to precisely align multiple clips on the instrument transformer housing with the corresponding slots on the circuit breaker module housing and apply a certain force to lock them in place. Existing installation and fixing methods for backpack-style instrument transformer modules still suffer from drawbacks such as complex assembly processes, difficulty in alignment, and a heavy reliance on the manufacturing precision and strength of multiple plastic clips and the tightness of the screws. These defects not only affect production efficiency and product consistency but also pose a potential threat to the long-term reliability and safety of the leakage current circuit breaker. Therefore, there is an urgent need for an instrument transformer installation solution with a simpler structure, better installation stability, and higher tolerance limits to improve product quality and reliability. Utility Model Content

[0004] The purpose of this utility model is to overcome the problems of complex assembly process, difficult alignment, and heavy dependence on the manufacturing precision and strength of multiple plastic clips and the tightness of screws in the existing backpack-type current transformer module installation and fixing method, which affect product quality and reliability.

[0005] To address the aforementioned problems, this utility model provides a leakage current transformer installation structure, including a circuit breaker body and a transformer module disposed at one end of the circuit breaker body, comprising: The first mounting component includes an upper connecting part disposed at one end of the circuit breaker body, and at least one upper positioning platform disposed on the upper side edge of the current transformer module and inserted into the upper connecting part to form a positioning fit. The upper connecting part is provided with at least one upper positioning groove that matches and fits into the upper positioning platform. An upper guide hole communicating with the upper positioning groove is provided between the upper positioning platform and the upper connecting part. The upper positioning platform and the upper connecting part are fixedly inserted in the upper guide hole by a first connecting shaft to keep the relative position of the upper positioning platform and the upper connecting part fixed. The second mounting component includes a lower mounting portion disposed at one end of the circuit breaker body and located below the upper connecting portion, and at least one lower positioning platform disposed on the lower side edge of the current transformer module and inserted into the lower connecting portion to form a positioning fit. The upper connecting portion is provided with at least one lower positioning groove that matches and fits into the upper positioning platform. A lower guide hole communicating with the lower positioning groove is provided between the lower positioning platform and the lower connecting portion. The lower positioning platform and the lower connecting portion are fixedly inserted into the lower guide hole by a second connecting shaft to maintain the relative position of the lower positioning platform and the lower connecting portion.

[0006] As a preferred embodiment, the lower positioning platform is provided at both ends of the lower edge of the current transformer module, and two lower positioning grooves are provided at the two ends of the lower connection part. The second mounting assembly also includes two positioning protrusions extending backward on the two lower positioning platforms, and two positioning holes respectively provided on the inner sidewalls of the two lower positioning grooves. The two positioning protrusions are pressed into the two positioning holes as the lower positioning platform is installed in the lower positioning groove.

[0007] As a preferred embodiment, the first mounting assembly further includes a limiting boss disposed in the upper positioning groove, a limiting hook groove formed between the limiting boss and the bottom surface of the upper positioning groove, and a positioning hook disposed on the upper side edge of the current transformer module and inserted into the limiting hook groove to form a limiting engagement. The positioning hook has an L-shaped structure and is partially surrounded by the outside of the first connecting shaft passing through the upper positioning groove.

[0008] As a preferred embodiment, a pair of guide blocks are provided on the inner walls of both sides of the upper positioning groove, and the upper guide hole is provided through the guide block. The pair of guide blocks are connected to the two ends of the upper positioning platform.

[0009] As a preferred embodiment, the current transformer module includes a housing connected to one end of the circuit breaker body via a first mounting assembly and a second mounting assembly, and a zero-sequence current transformer disposed within the housing. The first mounting assembly and the second mounting assembly together form a dual upper and lower fixing position for the housing at one end of the circuit breaker body. As a preferred embodiment, the housing consists of an upper cover and a lower base. The top side of the upper cover is formed with a planar protrusion extending toward the circuit breaker body. The bottom of the planar protrusion is coaxially provided with two upper positioning bosses and at least one positioning hook formed between the two positioning bosses.

[0010] As a preferred embodiment, an L-shaped side platform is formed on one side of the bottom of the lower housing, and two coaxially opposite lower positioning platforms are provided on the L-shaped side platform.

[0011] As a preferred embodiment, the circuit breaker body includes multiple circuit breaker units arranged side by side. One end of each circuit breaker unit is provided with multiple lower positioning slots and multiple upper positioning slots distributed vertically. The multiple lower positioning slots and multiple upper positioning slots are distributed at intervals along the arrangement direction of the multiple circuit breaker units.

[0012] As a preferred embodiment, the upper connecting portion includes upper stepped platforms respectively formed at one end of a plurality of circuit breaker units, and the lower connecting portion includes lower stepped platforms respectively formed at one end of a plurality of circuit breaker units.

[0013] As a preferred embodiment, both the first connecting shaft and the second connecting shaft are pins or rivets.

[0014] Compared with the prior art, the technical solution of this utility model has the following advantages: 1. In the leakage current transformer installation structure provided by this utility model, the transformer module is fixed to one end of the circuit breaker through a first mounting component and a second mounting component, forming a double-fixed fit. During installation, the upper positioning platform in the first mounting component is directly matched and fitted with the upper positioning groove of the upper connecting part of the circuit breaker body, and the lower positioning platform of the second mounting component is matched and fitted with the lower positioning groove of the lower connecting part of the circuit breaker body. The positioning and fitting design of the upper positioning platform and the upper positioning groove, and the lower positioning platform and the lower positioning groove, plays a pre-positioning constraint role, forming a clear guide and positioning benchmark. The initial positioning of the two can be quickly achieved without repeated calibration, reducing human alignment error. According to the upper guide hole and the lower guide hole respectively through the upper and lower positioning platforms and the upper and lower connecting parts, it is for the subsequent connection shaft. The through-shaft provides a coaxial reference, and the first and second connecting shafts, respectively, are fixed in the upper and lower guide holes, providing reliable mechanical locking. This ensures that the relative position between the current transformer module and the circuit breaker body is fixed for a long time. The current transformer module designed with this installation structure can better meet the installation requirements of multi-unit circuit breakers. The entire installation structure forms a multi-point fixation, with uniform stress distribution and strong connection stability. The overall installation process mainly consists of two core operations: insertion pre-positioning and through-shaft fixing. There is no need to repeatedly press the buckles or tighten the screws one by one, which greatly simplifies the assembly process and allows for higher tolerance of parts. It is especially suitable for rapid assembly in mass production, greatly reducing the installation difficulty and time cost for operators, and improving assembly efficiency and product consistency.

[0015] 2. In the leakage current transformer installation structure provided by this utility model, when the lower positioning platform drives the positioning protrusion to insert into the lower positioning groove, the positioning protrusion continues to press into the positioning insertion hole on the side wall to form an elastic snap-lock, which effectively suppresses the lateral shaking or loosening of the transformer module. The advantage of this design is that before the transformer module is inserted into the second connecting shaft, after the positioning protrusion is snapped into the positioning insertion hole, the transformer module and the lower connecting part of the circuit breaker are actually initially fixed, that is, pre-fixed before the shaft is tightened, simplifying the assembly process, and preventing the lower positioning protrusion from falling out of the positioning groove due to vibration and other factors. This can significantly enhance the vibration and impact resistance of the transformer module installation and improve long-term stability.

[0016] 3. In the leakage current transformer installation structure provided by this utility model, the circuit breaker body is composed of multiple circuit breaker units. Multiple lower positioning slots and multiple upper positioning slots are distributed at equal intervals along the arrangement direction of the circuit breaker units on one end of the multiple circuit breaker units. That is, the upper and lower positioning slots of the multiple circuit breaker units adopt a standard interval design, and the upper and lower guide holes designed through the positioning slots provide a unified fixed reference, thereby realizing flexible matching between the transformer module and the circuit breaker. This allows the transformer module to be matched with leakage current circuit breakers of different pole numbers and lengths, and the installation is highly versatile. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 This is a schematic diagram of the installation structure of the leakage current transformer of this utility model; Figure 2 This is a schematic diagram of the split structure of the leakage current transformer installation structure of this utility model; Figure 3 This is a schematic diagram of the circuit breaker body of this utility model; Figure 4 This is a schematic diagram of the current transformer module of this utility model.

[0019] Explanation of reference numerals in the attached drawings: 100 current transformer module; 1. Housing; 11. Upper cover; 12. Lower base; 13. Planar protrusion; 14. L-shaped side platform; 2. Upper positioning platform; 3. Positioning hook; 4. Lower positioning platform; 5. Positioning protrusion; 6. Upper connecting part; 61. Upper positioning groove; 62. Upper guide hole; 63. Limiting protrusion; 64. Limiting hook groove; 7. Lower connecting part; 71. Lower positioning groove; 72. Positioning insertion hole; 73. Lower guide hole; 8. Guide block; 9. Circuit breaker body; 91. Circuit breaker unit. Detailed Implementation

[0020] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 mechanical connection or an electrical 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 utility model based on the specific circumstances.

[0023] Example This utility model provides, for example Figure 1-4 The illustrated residual current transformer mounting structure includes a circuit breaker body 9 and a transformer module 100 disposed at one end of the circuit breaker body. The transformer module 100 and the circuit breaker body 9 are fixedly connected via a first mounting component and a second mounting component. The specific arrangement is as follows: The first mounting component includes an upper connecting part 6 disposed at one end of the circuit breaker body 9, and at least one upper positioning platform 2 disposed on the upper side edge of the current transformer module 100 and inserted into the upper connecting part 6 to form a positioning fit. The upper connecting part 6 is provided with at least one upper positioning groove 61 that matches and fits into the upper positioning platform 2. An upper guide hole 62 communicating with the upper positioning groove 61 is provided between the upper positioning platform 2 and the upper connecting part 6. The upper positioning platform 2 and the upper connecting part 6 are fixedly inserted in the upper guide hole 62 by a first connecting shaft to keep the relative position of the upper positioning platform 2 and the upper connecting part 6 fixed. The second mounting component includes a lower mounting portion located at one end of the circuit breaker body 9 and below the upper connecting portion 6, and at least one lower positioning platform 4 located on the lower side edge of the transformer module 100 and inserted into the lower connecting portion 7 to form a positioning fit. The upper connecting portion 6 is provided with at least one lower positioning groove 71 that matches and fits into the upper positioning platform 2. A lower guide hole 73 is provided between the lower positioning platform 4 and the lower connecting portion 7, communicating with the lower positioning groove 71. The lower positioning platform 4 and the lower connecting portion 7 are fixedly inserted into the lower guide hole 73 by a second connecting shaft to maintain the relative position of the lower positioning platform 4 and the lower connecting portion 7.

[0024] In the above embodiment, the current transformer module 100 is fixed to one end of the circuit breaker by a first mounting component and a second mounting component, forming a double-fixed fit between the two. During specific installation, the upper positioning platform 2 in the first mounting component is directly matched and fitted with the upper positioning groove 61 of the upper connecting part 6 of the circuit breaker body 9, and the lower positioning platform 4 of the second mounting component is matched and fitted with the lower positioning groove 71 of the lower connecting part 7 of the circuit breaker body 9. The positioning fit design of the upper positioning platform 2 and the upper positioning groove 61, and the lower positioning platform 4 and the lower positioning groove 71, adopts a "convex-concave" fit, which plays a pre-positioning constraint role, forming a clear guide and positioning benchmark. The initial positioning of the two can be quickly achieved without repeated calibration, reducing human alignment error. The upper guide hole 62 and the lower guide hole 73 are respectively set through the upper and lower positioning platforms 4 and the upper and lower connecting parts 7, respectively, for subsequent... The through-hole connection of the connecting shaft provides a coaxial reference. The first and second connecting shafts, respectively fixed in the upper guide hole 62 and lower guide hole 73, provide reliable mechanical locking, thereby maintaining the relative position of the current transformer module 100 and the circuit breaker body 9 tissue box for a long time. The current transformer module 100 with this installation structure design can better meet the installation requirements of multi-unit circuit breakers, conforms to modular design, and the entire installation structure forms a multi-point fixation at the top and bottom, with uniform stress distribution and strong connection stability. The overall installation process mainly consists of two core operations: insertion pre-positioning and shaft fixing. There is no need to repeatedly press the buckle or tighten the screws one by one, which greatly simplifies the assembly process and allows for higher tolerance of parts. It is especially suitable for rapid assembly in mass production, greatly reducing the installation difficulty and time cost for operators, and improving assembly efficiency and product consistency.

[0025] In a preferred embodiment, the lower positioning platform 4 is provided at both ends of the lower side edge of the current transformer module 100, and two lower positioning grooves 71 are provided at the corresponding ends of the lower connecting part 7. The second mounting assembly also includes two positioning protrusions 5 extending backwards from the two lower positioning platforms 4, and two positioning insertion holes 72 respectively provided on the inner sidewalls of the two lower positioning grooves 71. With this structural design, when the lower positioning platform 4 drives the positioning protrusions to be inserted into the lower positioning grooves 71, the positioning protrusions 5 continue to press into the positioning insertion holes 72 on the sidewalls to form A flexible snap-locking mechanism effectively suppresses lateral shaking or loosening of the transformer module 100. The advantage of this design is that before the transformer module is inserted into the positioning hole by the positioning protrusion, the transformer module and the lower connection part 7 of the circuit breaker are actually pre-fixed. This provides pre-fixation before the shaft is tightened, simplifies the assembly process, and prevents the lower positioning protrusion from falling out of the positioning groove due to vibration or other factors. This significantly enhances the vibration and impact resistance of the transformer module installation and improves long-term stability.

[0026] In a further preferred embodiment, the first mounting component also includes a limiting boss 63 disposed within the upper positioning groove 61, a limiting hook groove 64 formed between the limiting boss 63 and the bottom surface of the upper positioning groove 61, and a positioning hook 3 disposed on the upper side edge of the current transformer module 100 and inserted into the limiting hook groove 64 to form a limiting engagement. The positioning hook 3 has an L-shaped structure and is partially surrounded by the outside of the first connecting shaft passing through the upper positioning groove 61. After the L-shaped positioning hook 3 is inserted into the limiting hook groove 64, its lateral hook arm is tightly fitted with the side of the limiting boss 63, and its longitudinal hook arm abuts against the bottom surface of the limiting hook groove 64, thereby forming a two-way locking mechanism that can preferably prevent the upper positioning platform from coming off and improve the stability of the mounting structure.

[0027] The specific structure of the current transformer module 100 is described in detail below: The current transformer module 100 includes a housing 1 disposed at one end of the circuit breaker body 9 via a first mounting component and a second mounting component, and a zero-sequence current transformer disposed within the housing. The first mounting component and the second mounting component together form a double-fixed position for the housing 1 at one end of the circuit breaker body 9, wherein, in combination with Figure 1-4As shown, the housing 1 consists of an upper cover 11 and a lower housing base 12, which are fixedly connected by bolts or snap fasteners. The top side of the upper cover 11 has a planar protrusion 13 extending towards the circuit breaker body. The bottom of the planar protrusion 13 has two upper positioning bosses and at least one positioning hook 3 formed between the two positioning bosses. With this structure, during assembly, the planar protrusion 13 of the upper cover 11 first fits against the upper connecting part of the circuit breaker body 9. Part 6, the upper cover 11 adopts a coordinated positioning design of upper positioning platform 2 and positioning hook 3, and directly cooperates with upper positioning groove 61 and limit hook groove 64 at one end of the circuit breaker to achieve multi-point positioning connection. After the upper positioning platform 2 is installed in place, the positioning hook 3 will also be inserted into the limit hook groove 64 to complete the positioning installation of the upper cover, ensuring the coaxiality of the installation. Then, only the first connecting shaft needs to be passed through to complete the permanent fixation, and the positioning hook 3 avoids the first connecting shaft passing through the upper positioning groove 61.

[0028] like Figure 4 As shown, an L-shaped side platform 14 is formed on one side of the bottom of the lower housing 12, and two coaxially opposite lower positioning platforms 4 are provided on the L-shaped side platform 14. During assembly, the L-shaped side platform 14 of the upper housing cover 11 is fitted to the lower connecting part 7 of the circuit breaker body 9. The lower housing cover adopts a cooperative positioning design of lower positioning platforms 4 and positioning protrusions 5, and directly cooperates with the lower positioning groove 71 and positioning insertion hole at one end of the circuit breaker to achieve multi-point positioning connection. According to the fact that the lower positioning platforms 4 are coaxially opposite at both ends of the L-shaped side platform 14, and each positioning platform is provided with a positioning protrusion, this design not only ensures the coaxiality of the installation, but also helps to distribute the force from the current transformer module 100 more evenly to both sides of the circuit breaker body 9 structure, avoiding stress concentration at one point, reducing the risk of fatigue or fracture of local plastic structure, thereby improving the overall mechanical strength and service life of the entire product.

[0029] In this embodiment, the circuit breaker body 9 includes multiple circuit breaker units arranged side by side. One end of each circuit breaker unit is provided with multiple lower positioning slots 71 and multiple upper positioning slots 61 distributed vertically. The multiple lower positioning slots 71 and multiple upper positioning slots 61 are spaced apart along the arrangement direction of the multiple circuit breaker units. The upper guide hole 62 is disposed through the multiple upper positioning slots 61, and the lower guide hole 73 is disposed through the multiple lower positioning slots 71. The first connecting shaft and the second connecting shaft are preferably pins, and the pins are clearance fit or transition fit with the upper guide hole 62 or the lower guide hole 73. Of course, the first connecting shaft and the second connecting shaft can also be selected as rivets, and the ends of the rivets are riveted and fixed after passing through the upper guide hole 62 or the lower guide hole 73. In a further preferred configuration, the upper connecting part 6 includes an upper stepped platform formed on one end of a plurality of circuit breaker units, and the lower connecting part 7 includes a lower stepped platform formed on one end of a plurality of circuit breaker units. The upper and lower stepped platforms are located on the upper and lower sides of the wiring port of the circuit breaker unit. A pair of guide blocks 8 are correspondingly provided on the inner walls of both sides of the upper positioning groove 61. The upper guide hole 62 is provided through the guide block 8. The pair of guide blocks 8 are connected to the two ends of the upper positioning platform 2. Since the wall thickness of the side plates of the upper positioning groove 61 formed by the upper stepped platform is relatively thin, the structural strength of the upper stepped platform can be enhanced by designing guide blocks. In summary, since the circuit breaker body 9 is composed of multiple circuit breaker units, multiple lower positioning slots 71 and multiple upper positioning slots 61 are equidistantly distributed at one end of the multiple circuit breaker units along the arrangement direction of the circuit breaker units. That is, the upper and lower positioning slots of the multiple circuit breaker units adopt a standard interval design, and the upper and lower guide holes designed through the positioning slots provide a unified fixed reference, thereby realizing flexible matching between the current transformer module and the circuit breaker. This allows the current transformer module to be matched with residual current circuit breakers of different pole lengths, and the installation is highly versatile.

[0030] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A leakage current transformer mounting structure, comprising a circuit breaker body (9) and a transformer module (100) disposed at one end of the circuit breaker body, characterized in that... ,include: The first mounting component includes an upper connecting part (6) disposed at one end of the circuit breaker body (9) and at least one upper positioning platform (2) disposed on the upper side edge of the transformer module and inserted into the upper connecting part (6) to form a positioning fit. The upper connecting part (6) is provided with at least one upper positioning groove (61) that matches and fits into the upper positioning platform (2). An upper guide hole (62) communicating with the upper positioning groove (61) is provided between the upper positioning platform (2) and the upper connecting part (6). The upper positioning platform (2) and the upper connecting part (6) are fixedly inserted in the upper guide hole (62) by a first connecting shaft to keep the upper positioning platform (2) and the upper connecting part (6) in a fixed relative position. The second mounting component includes a lower mounting part located at one end of the circuit breaker body (9) and below the upper connecting part (6), and at least one lower positioning platform (4) located on the lower side edge of the transformer module and inserted into the lower connecting part (7) to form a positioning fit. The upper connecting part (6) is provided with at least one lower positioning groove (71) that matches and fits into the upper positioning platform (2). A lower guide hole (73) communicating with the lower positioning groove (71) is provided between the lower positioning platform (4) and the lower connecting part (7). The lower positioning platform (4) and the lower connecting part (7) are fixedly inserted in the lower guide hole (73) by a second connecting shaft to keep the relative position of the lower positioning platform (4) and the lower connecting part (7) fixed.

2. The leakage current transformer installation structure according to claim 1, characterized in that: The lower positioning platform (4) is provided at both ends of the lower side of the transformer module (100), and two lower positioning grooves (71) are provided at both ends of the lower connecting part (7). The second mounting assembly also includes two positioning protrusions (5) extending backward on the two lower positioning platforms (4), and two positioning holes (72) respectively provided on the inner sidewalls of the two lower positioning grooves (71). The two positioning protrusions (5) are installed in the lower positioning grooves (71) along with the lower positioning platform (4) and pressed into the two positioning holes.

3. The leakage current transformer installation structure according to claim 2, characterized in that: The first mounting assembly further includes a limiting boss (63) disposed in the upper positioning groove (61), a limiting hook groove (64) formed between the limiting boss (63) and the bottom surface of the upper positioning groove (61), and a positioning hook (3) disposed on the upper side edge of the current transformer module (100) and inserted into the limiting hook groove (64) to form a limiting engagement. The positioning hook (3) has an L-shaped structure and is partially surrounded by the outside of the first connecting shaft passing through the upper positioning groove (61).

4. The leakage current transformer installation structure according to claim 3, characterized in that: A pair of guide blocks (8) are provided on the inner walls of both sides of the upper positioning groove (61), and the upper guide hole (62) is provided through the guide block (8). The pair of guide blocks (8) are connected to the two ends of the upper positioning platform (2).

5. A leakage current transformer mounting structure according to any one of claims 1-4, characterized in that: The current transformer module (100) includes a housing (1) disposed at one end of the circuit breaker body (9) by a first mounting component and a second mounting component, and a zero-sequence current transformer disposed in the housing (1). The first mounting component and the second mounting component together form a double fixing position of the housing (1) at one end of the circuit breaker body (9).

6. The leakage current transformer installation structure according to claim 5, characterized in that: The housing (1) consists of an upper cover (11) and a lower base (12). The top side of the upper cover (11) is formed with a planar protrusion (13) extending toward the circuit breaker. The bottom of the planar protrusion (13) is coaxially provided with two upper positioning bosses and at least one positioning hook (3) formed between the two upper positioning platforms (2).

7. The leakage current transformer installation structure according to claim 6, characterized in that: The bottom side of the lower housing (12) is formed with an L-shaped side platform (14), and two coaxially opposite lower positioning platforms (4) are provided on the L-shaped side platform (14).

8. The leakage current transformer installation structure according to claim 1, characterized in that: The circuit breaker body (9) includes multiple circuit breaker units arranged side by side. One end of each circuit breaker unit is provided with multiple lower positioning slots (71) and multiple upper positioning slots (61) distributed vertically. The multiple lower positioning slots (71) and multiple upper positioning slots (61) are distributed at intervals along the arrangement direction of the multiple circuit breaker units. The upper guide hole (62) is disposed through the multiple upper positioning slots (61), and the lower guide hole (73) is disposed through the multiple lower positioning slots (71).

9. The leakage current transformer installation structure according to claim 8, characterized in that: The upper connecting part (6) includes an upper stepped platform formed on one end of a plurality of circuit breaker units, and the lower connecting part (7) includes a lower stepped platform formed on one end of a plurality of circuit breaker units. The upper stepped platform and the lower stepped platform are located on the upper and lower sides of the wiring port of the circuit breaker unit.

10. The leakage current transformer installation structure according to claim 1, characterized in that: Both the first connecting shaft and the second connecting shaft are pins or rivets.

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