A circuit breaker

Abstract

The application provides a circuit breaker, relates to the technical field of switches, and is used for facilitating the disassembly and assembly of a mutual inductor without increasing the volume of a shell. The circuit breaker comprises a shell, a wiring terminal and a mutual inductor, wherein the wiring terminal is arranged on the shell. The connecting end of the wiring terminal extends to the outside of the shell. The mutual inductor is detachably arranged on the shell and located outside the shell. The mutual inductor corresponds to the wiring terminal, the mutual inductor is provided with a through hole matched with the connecting end, and the connecting end penetrates through the through hole.

Description

Technical Field

[0001] This application relates to the field of switch technology, specifically to a circuit breaker. Background Technology

[0002] A circuit breaker is an electrical device used to protect and control circuits. Its main function is to safely connect, carry, and disconnect the current in a circuit under normal or fault conditions, thereby ensuring electrical safety.

[0003] Circuit breakers typically include current transformers, which are used to sense and measure the current in the circuit where the circuit breaker is located, and to convert large currents into safe and easy-to-process small current signals for use by the circuit breaker's protection, measurement, and control units.

[0004] Current transformers not only increase the size of the circuit breaker housing, but also make disassembly and assembly inconvenient. Utility Model Content

[0005] This application provides a circuit breaker that facilitates the installation and removal of current transformers without increasing the size of the housing.

[0006] To achieve the above objectives, this application provides a circuit breaker, including a housing, terminals, and a current transformer. The terminals are disposed on the housing. The connection end of the terminals extends outside the housing. The current transformer is detachably disposed on the housing and located outside the housing. The current transformer corresponds to the terminals, and the current transformer has a through hole that mates with the connection end, through which the connection end passes.

[0007] When using the above technical solution, the connection ends of the terminals extend outside the housing to facilitate electrical connection between the terminals and an external power supply or load. The current transformer is located outside the housing, thus not occupying internal space and ensuring that the housing's size does not increase due to the transformer's installation. The current transformer is detachably mounted outside the housing. Therefore, when the current transformer malfunctions and requires repair or replacement, there is no need to disassemble the housing or return it to the factory; the current transformer can be directly removed from the housing. After reinstalling the current transformer on the housing, complex on-site calibration is usually unnecessary, significantly reducing the technical requirements for maintenance personnel.

[0008] Meanwhile, the housing and its internal components can be standardized for production, allowing for the creation of various circuit breakers by combining different specifications and models of current transformers, thus reducing production complexity and cost. Furthermore, the external location of the current transformer facilitates heat dissipation, minimizing the impact of temperature rise on measurement accuracy. This also extends the transformer's lifespan and reduces costs. In addition, the external mounting of the current transformer provides a clear target for operation, reducing safety risks associated with operating within densely packed circuit breaker compartments and simplifying operation.

[0009] The current transformer corresponds to the terminal block, and the current transformer is provided with a through hole that mates with the connection terminal. The connection terminal passes through the through hole. At this time, the connection terminal passes through the housing and then through the through hole to facilitate connection of the terminal block to an external power supply or external equipment.

[0010] In one possible implementation, the housing is provided with a recess that mates with the current transformer.

[0011] When the above technical solution is adopted, the recessed part provides a clear positioning and installation benchmark for the current transformer, allowing installers to quickly and accurately place the current transformer in the correct position without repeated adjustments, thus improving assembly efficiency.

[0012] The current transformer is housed within a recess, which limits its position and enhances the stability of the transformer mounted on the housing. During transportation, installation, or operation, this effectively prevents displacement, loosening, or damage to the current transformer, ensuring its reliability.

[0013] Furthermore, the recessed design allows the current transformer to be embedded into the housing, making full use of the housing's redundant space and wall thickness. This allows the overall dimensions of the circuit breaker to be smaller, resulting in a neater, more compact external layout and improved aesthetics. It also saves installation space, especially in space-constrained distribution rooms, substations, or compact switchgear.

[0014] In addition to the above, the instrument transformer is housed within a recess, which protects it from the casing, providing better dust, moisture, and foreign object contact, thereby enhancing the overall protection level of the equipment and enabling it to adapt to harsher operating environments. Simultaneously, the instrument transformer's contact with the casing allows for more efficient heat transfer from its internal components to the casing and dissipation into the surrounding environment, preventing heat buildup and ensuring the long-term stable operation of the circuit breaker. This effectively prevents performance degradation or damage to the instrument transformer due to overheating.

[0015] In one possible implementation, the size of the recess is less than or equal to the size of the transformer in the depth direction of the recess.

[0016] When using the above technical solution, the size of the recessed portion can be smaller than the size of the current transformer in the depth direction. In this case, after the current transformer is installed on the housing, it can be ensured that the base of the current transformer is in contact with the bottom of the recessed portion, and the heat generated by the current transformer during operation can be conducted to the housing, thereby reducing the contact thermal resistance between the current transformer and the housing.

[0017] During the installation of the current transformer, when the base of the current transformer contacts the bottom of the recess, it indicates that the current transformer is in place, which ensures the consistency of assembly quality.

[0018] In the depth direction of the recess, the size of the recess can also be equal to the size of the transformer.

[0019] At this point, the current transformer and the housing are perfectly integrated, forming a smooth and flat surface without any protrusions or depressions, resulting in a neat and aesthetically pleasing appearance.

[0020] In one possible implementation, the circuit breaker also includes a baffle, the side of which near the housing is in press-fit contact with the current transformer to press the current transformer against the housing.

[0021] When the above technical solution is adopted, after aligning and matching the current transformer with the recess and placing the current transformer in the recess, a baffle can be used to press the current transformer onto the housing, thereby positioning the current transformer on the housing.

[0022] This installation method is easy to operate, requiring no special tools or complex procedures, which greatly improves assembly efficiency. At the same time, it reduces the technical requirements and training costs for operators, significantly reducing the difficulty and time required for assembly and subsequent maintenance.

[0023] When a short circuit or overload occurs in the circuit containing the circuit breaker, the circuit breaker may vibrate under the action of electrodynamic repulsion. The continuous clamping force provided by the baffle can firmly fix the current transformer to the housing, preventing the current transformer from loosening, shifting, or generating noise due to vibration, thus improving the structural stability of the circuit breaker.

[0024] Meanwhile, the baffle presses the current transformer firmly against the housing, with relatively low requirements for the shape tolerances of the recesses on the current transformer and housing. Even if the current transformer is slightly smaller or the recess is slightly larger in its depth direction, meaning there is a gap between the current transformer and the recess, the baffle can still fix the current transformer with clamping force and eliminate the gap, ensuring fixation and contact. This reduces the stringent requirements for the machining accuracy of the housing and current transformer, controlling manufacturing costs.

[0025] In addition, the baffle can be adapted to a variety of current transformers within a certain size range, increasing the flexibility and versatility of the design.

[0026] In one possible implementation, the baffle is disposed on the terminal block.

[0027] When the above technical solution is adopted, compared with setting the baffle on the housing, setting the baffle on the terminal reduces the processing cost and requirements of the housing, reduces the risk of uneven stress on the transformer due to uneven housing, and prevents the housing from being cracked or deformed.

[0028] Furthermore, after the baffle is installed on the terminal block, it presses the current transformer firmly against the housing. There is a force between the baffle and the terminal block, and simultaneously, a force between the baffle and the current transformer. The current transformer also exerts forces with both the housing and the baffle. This creates a stable force transmission between the baffle, the current transformer, and the housing, improving the structural integrity and mechanical reliability of the circuit breaker.

[0029] In one possible implementation, the baffle is provided with a clearance hole that mates with the connecting end, and the connecting end passes through the clearance hole.

[0030] When using the above technical solution, in actual operation, the connecting end can be passed through the clearance hole first, which can guide the baffle to the correct position. When the circuit breaker vibrates, a shear force will be generated between the baffle and the connecting end. The inner wall of the clearance hole can bear and disperse this force, avoiding stress concentration.

[0031] In addition, the baffle is provided with clearance holes that mate with the connection end. The baffle has a large area, indicating that the contact area between the baffle and the current transformer is large. This improves the stability of pressing the current transformer onto the housing.

[0032] Furthermore, since the connection end passes through the through hole of the current transformer and the clearance hole of the baffle, it can be concluded that the current transformer is covered and pressed tightly by the baffle on the outer periphery of the corresponding through hole, which effectively improves the balance of the current transformer under force and reduces the possibility of the current transformer being tilted due to uneven force.

[0033] In one possible implementation, an extension is provided on the baffle at the clearance hole location, and the extension is connected to the wiring terminal.

[0034] When the above technical solution is adopted, the contact area and friction between the baffle and the terminal block are increased when the baffle is connected to the terminal block, thereby further improving the connection stability between the baffle and the terminal block.

[0035] Meanwhile, the extension section can better resist vibration and shear forces, preventing lateral displacement or fretting wear between the baffle and the terminal. This makes the baffle and terminal better integrated, sharing the load, and the vibration energy is more effectively dispersed and absorbed.

[0036] In one possible implementation, the extension extends along the extension direction of the connection end.

[0037] When the above technical solution is adopted, the extension can fit tightly with the connection end, further increasing the contact area and friction between the baffle and the terminal, and improving the connection stability between the baffle and the terminal.

[0038] Meanwhile, the extension section allows for more precise guidance and alignment during assembly, reducing the possibility of the baffle becoming misaligned.

[0039] In addition, the increased mating surface between the baffle and the terminal block improves the torsional stiffness and radial stability of the connection, ensuring that the structure will not deform under unexpected lateral forces.

[0040] In one possible implementation, heat dissipation holes are provided on the baffle.

[0041] When adopting the above technical solution, on the one hand, the design of the heat dissipation holes can reduce the amount of material used in the baffle, saving costs. On the other hand, it can increase the contact area between the current transformer and the air, enabling the heat from the current transformer to be dissipated more quickly. Furthermore, the heat dissipation holes form air convection channels on the baffle, enhancing heat dissipation efficiency.

[0042] In one possible implementation, there are multiple heat dissipation holes, which are arranged in an array on the baffle.

[0043] When the above technical solution is adopted, the air insulation layer between the baffle and the transformer can be broken, ensuring that heat can be efficiently dissipated from the surface of the transformer, avoiding local heat accumulation, thereby ensuring the overall temperature uniformity of the transformer and improving the measurement accuracy of the transformer.

[0044] In addition, the array of multiple heat dissipation holes on the baffle plate enhances the aesthetics of the circuit breaker and conforms to the aesthetic principles of industrial design. Attached Figure Description

[0045] Figure 1 A partial structural diagram of the circuit breaker provided in the embodiments of this application. Figure 1 .

[0046] Figure 2 A partial structural diagram of the circuit breaker provided in the embodiments of this application. Figure 2 .

[0047] Figure 3 This is a schematic diagram of the housing provided in an embodiment of this application.

[0048] Figure 4 This is a schematic diagram of the structure of the baffle provided in an embodiment of this application.

[0049] Explanation of reference numerals in the attached figures: 1-Housing, 11-Recessed portion, 2-Terminal, 3-Inductor, 4-Baffle, 41-Allowing hole, 42-Extension, 43-Heat dissipation hole. Detailed Implementation

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

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0052] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0053] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0054] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0055] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0056] Circuit breakers typically include current transformers, which are used to sense and measure the current in the circuit where the circuit breaker is located, and to convert large currents into safe and easy-to-process small current signals for use by the circuit breaker's protection, measurement, and control units.

[0057] The transformers in circuit breakers are mainly divided into two types: current transformers (CT) and zero-sequence current transformers (ZCT).

[0058] When the current exceeds the rated value for an extended period (e.g., 1.2 times the rated current) but has not yet reached the short-circuit current, the current transformer transmits a signal to the trip unit of the circuit breaker. After a preset delay, the trip unit activates, cutting off the current in the circuit where the circuit breaker is located, preventing the line from being damaged due to overheating or causing a fire.

[0059] When a short circuit occurs in the circuit containing the circuit breaker, and the current increases dramatically (reaching several times or even tens of times the rated current), the current transformer will instantly detect this huge current signal and immediately transmit it to the trip unit. The trip unit will operate with no delay or a very short delay, quickly disconnecting the circuit and protecting the entire power distribution system from damage caused by the short-circuit current.

[0060] When a leakage current occurs in the circuit containing the circuit breaker or a person experiences an electric shock, some of the current will flow back to the ground, causing the current flowing in and out to be unequal (i.e., generating "residual current"). This current difference will induce a signal in the secondary coil of the current transformer. When this signal exceeds a set safety value (e.g., 30mA), the circuit breaker will trip quickly, thereby preventing electric shock accidents and electrical fires.

[0061] In existing technology, instrument transformers are generally installed inside a housing. In this case, on the one hand, the instrument transformer occupies space within the housing, making the housing bulky. On the other hand, when the instrument transformer needs repair or replacement, the circuit breaker must first be completely removed from the line, and then partially or completely disassembled to remove the instrument transformer for repair or replacement. This method is not convenient for the installation and removal of instrument transformers.

[0062] In view of the problems existing in the prior art, such as Figure 1 and Figure 2 As shown, this application embodiment provides a circuit breaker, which includes a housing 1, a terminal block 2 and a current transformer 3, with the terminal block 2 disposed on the housing 1.

[0063] Terminal 2 can be either an incoming terminal 2 or an outgoing terminal 2. Terminal 2 can be used for electrical connection to an external power source or an external load.

[0064] Terminal 2 is generally fixedly mounted on housing 1. The method by which terminal 2 is fixedly mounted on housing 1 is not specifically limited here. For example, it can be fixedly mounted on housing 1 by welding, snap-fitting, or screw connection. Of course, it is not limited to these methods in practice.

[0065] The specific structure, size, and material of terminal block 2 are not specified here.

[0066] One end of the terminal block 2 is located inside the housing 1, and the connecting end of the terminal block 2 extends to the outside of the housing 1 so that the terminal block 2 can be electrically connected to an external power source or an external load.

[0067] In practice, the number of terminals 2 is determined based on the number of poles of the circuit breaker. Specifically, when the circuit breaker is a single-pole circuit breaker, the number of terminals 2 is generally two, namely one incoming terminal 2 and one outgoing terminal 2. When the circuit breaker is a two-pole circuit breaker, the number of terminals 2 is generally four, namely two incoming terminals 2 and two outgoing terminals 2.

[0068] like Figures 1 to 3 The circuit breaker shown is a three-pole circuit breaker with six terminals 2: three incoming terminals 2 and three outgoing terminals 2. The three incoming terminals 2 are arranged sequentially in a certain direction, and the three outgoing terminals 2 are arranged sequentially in the same direction.

[0069] In the embodiments provided in this application, the current transformer 3 is detachably disposed on the housing 1, and the current transformer 3 is located outside the housing 1.

[0070] Thus, the current transformer 3 is located outside the housing 1, and it does not occupy the internal space of the housing 1, ensuring that the volume of the housing 1 does not increase due to the installation of the current transformer 3. The current transformer 3 is detachably mounted outside the housing 1. Therefore, when the current transformer 3 malfunctions and needs repair or replacement, it is not necessary to disassemble the housing 1 or return it to the factory; the current transformer 3 can be directly removed from the housing 1. After reinstalling the current transformer 3 on the housing 1, complex on-site calibration is usually unnecessary, greatly reducing the technical requirements for maintenance personnel.

[0071] Meanwhile, the housing 1 and the components inside the housing 1 can be produced in a standardized manner. By matching different specifications and models of current transformers 3, various specifications of circuit breakers can be derived, reducing production complexity and cost.

[0072] Furthermore, the fact that the current transformer 3 is located outside the housing 1 facilitates heat dissipation and reduces the impact of temperature rise on measurement accuracy. This also extends the service life of the current transformer 3 and reduces costs. In addition, the external installation of the current transformer 3 provides a clear target for operation, reducing safety risks associated with operating within densely packed circuit breaker compartments and simplifying operation.

[0073] In practice, the current transformer 3 can be detachably installed on the housing 1. This is not specifically limited here, but shall be subject to the actual situation.

[0074] For example, the current transformer 3 can be directly or indirectly mounted on the housing 1 using screw connections, snap-fit ​​connections, or other methods. Of course, this is not the only practical application.

[0075] The current transformer 3 corresponds to the terminal 2. In fact, the current transformer 3 corresponds to either the incoming terminal 2 or the outgoing terminal 2.

[0076] It should be noted that the current transformer 3 described here corresponds to the terminal 2, which means that the installation position and quantity of the current transformer 3 correspond to the incoming terminal 2 or the outgoing terminal 2.

[0077] Specifically, when the circuit breaker has one incoming terminal 2 or one outgoing terminal 2, the number of current transformers 3 is one. And this one current transformer 3 corresponds to one incoming terminal 2 or one outgoing terminal 2.

[0078] When a circuit breaker has two incoming terminals 2 or two outgoing terminals 2, the number of current transformers 3 is two. These two current transformers 3 correspond to either the two incoming terminals 2 or the two outgoing terminals 2 respectively.

[0079] When a circuit breaker has three incoming terminals 2 or three outgoing terminals 2, the number of current transformers 3 is three. These three current transformers 3 correspond respectively to the three incoming terminals 2 or respectively to the three outgoing terminals 2.

[0080] The current transformer 3 is provided with a through hole that matches the connection end, and the connection end passes through the through hole. At this time, the connection end passes through the housing 1 and then through the through hole, so that the terminal block 2 can be connected to an external power supply or external equipment.

[0081] Terminal 2 is generally a plate-shaped structure. In this case, the through hole is a rectangular hole. The size of the through hole depends on the cross-sectional dimensions of terminal 2, and is not specifically limited here.

[0082] In one possible implementation, please combine Figures 1 to 3 As shown, the housing 1 is provided with a recess 11 that cooperates with the current transformer 3.

[0083] Thus, the recessed portion 11 provides a clear positioning and installation reference for the current transformer 3, allowing operators to quickly and accurately place the current transformer 3 in the correct position without repeated adjustments, thereby improving assembly efficiency.

[0084] The current transformer 3 is disposed within the recess 11, which limits the position of the current transformer 3 and enhances the stability of the current transformer 3 mounted on the housing 1. During transportation, installation, or operation, it effectively prevents the current transformer 3 from shifting, loosening, or being damaged, thus ensuring the reliability of the current transformer 3.

[0085] Furthermore, the recessed portion 11 allows the current transformer 3 to be embedded into the housing 1, making full use of the redundant space and wall thickness of the housing 1. This allows the overall dimensions of the circuit breaker to be smaller, resulting in a neater and more compact external layout and improved aesthetics. It also saves installation space, especially in space-constrained distribution rooms, substations, or compact switchgear.

[0086] In addition to the above, the current transformer 3 is housed within the recess 11, where it is protected by the housing 1. This provides better protection against dust, moisture, and foreign objects, thereby enhancing the overall protection level of the equipment and enabling it to withstand harsher operating environments. Simultaneously, the current transformer 3's contact with the housing 1 allows for more effective heat transfer from its internal components to the housing 1 and dissipation into the surrounding environment, preventing heat accumulation and ensuring the long-term stable operation of the circuit breaker. This effectively prevents the current transformer 3 from experiencing performance degradation or damage due to overheating.

[0087] In practice, the number of recesses 11 is the same as the number of current transformers 3, and one recess 11 corresponds to one current transformer 3. The size of the recess 11 corresponds to the size of the current transformer 3.

[0088] In the embodiments provided in this application, the size of the recess 11 in the depth direction can be smaller than the size of the current transformer 3. In this case, after the current transformer 3 is installed on the housing 1, it can be ensured that the base of the current transformer 3 is in contact with the bottom of the recess 11, and the heat generated by the current transformer 3 during operation can be conducted to the housing 1, thereby reducing the contact thermal resistance between the current transformer 3 and the housing 1.

[0089] During the installation of the current transformer 3, when the base of the current transformer 3 contacts the bottom of the recess 11, it indicates that the current transformer 3 is in place, which can ensure the consistency of assembly quality.

[0090] In the depth direction of the recess 11, the size of the recess 11 can also be equal to the size of the current transformer 3.

[0091] At this point, the current transformer 3 and the housing 1 are perfectly integrated, forming a smooth and flat surface without any protrusions or depressions, resulting in a neat and aesthetically pleasing appearance.

[0092] Of course, in the depth direction of the recess 11, the size of the recess 11 can also be larger than the size of the current transformer 3.

[0093] At this point, there is a tolerance space between the current transformer 3 and the recess 11 in the depth direction of the recess 11. This significantly reduces the requirements for the machining depth tolerance of the recess 11 in the housing 1 and the height tolerance of the current transformer 3 itself, making manufacturing easier and cheaper. During assembly, operators do not need to use a large torque to forcibly pull the current transformer 3 to the designated position, avoiding installation stress or component deformation caused by tolerance accumulation. The installation process is simpler and more fault-tolerant.

[0094] As an optional approach, the circuit breaker provided in this embodiment also includes a baffle 4, please refer to... Figure 1 and Figure 2 As shown. The side of the baffle 4 closest to the housing 1 presses against the current transformer 3 to press the current transformer 3 firmly onto the housing 1.

[0095] At this time, after aligning and matching the current transformer 3 with the recess 11 and placing the current transformer 3 in the recess 11, the baffle 4 can be used to press the current transformer 3 onto the housing 1, thereby positioning the current transformer 3 on the housing 1.

[0096] This installation method is easy to operate, requiring no special tools or complex procedures, which greatly improves assembly efficiency. At the same time, it reduces the technical requirements and training costs for operators, significantly reducing the difficulty and time required for assembly and subsequent maintenance.

[0097] When a short circuit or overload occurs in the circuit where the circuit breaker is located, the circuit breaker may vibrate under the action of electric repulsion. The continuous clamping force provided by the baffle 4 can firmly fix the current transformer 3 to the housing 1, preventing the current transformer 3 from loosening, shifting or generating noise due to vibration, and improving the structural stability of the circuit breaker.

[0098] Meanwhile, the baffle 4 presses the current transformer 3 firmly onto the housing 1, resulting in relatively low shape tolerance requirements for the current transformer 3 and the recess 11 on the housing 1. Even if the current transformer 3 is slightly smaller or the recess 11 is slightly larger in its depth direction, meaning there is a gap between the current transformer 3 and the recess 11, the baffle 4 can still fix the current transformer 3 with the clamping force and eliminate the gap, ensuring fixation and contact. This reduces the stringent requirements on the machining accuracy of the housing 1 and the current transformer 3, controlling manufacturing costs.

[0099] In addition, the baffle 4 can be adapted to a variety of current transformers 3 within a certain size range, increasing the flexibility and versatility of the design.

[0100] The baffle 4 can be a straight plate structure, or it can be an L-shaped or other structure. This is just an example and is not intended to be a specific limitation.

[0101] The specific dimensions of the baffle 4 are not limited here. The orthographic projection of the baffle 4 on the housing 1 can be located within the orthographic projection of the current transformer 3 on the housing 1. Of course, the orthographic projection of the baffle 4 on the housing 1 can also be larger than the orthographic projection of the current transformer 3 on the housing 1.

[0102] In practice, the baffle 4 can be installed on the housing 1. The method of installing the baffle 4 on the housing 1 is not specifically limited here. For example, it can be installed on the housing 1 by snap-fit, screw connection, or other methods. Of course, it is not limited to these methods in practice.

[0103] In one example, such as Figure 1 and Figure 2 As shown, baffle 4 is disposed on terminal 2.

[0104] Compared to placing the baffle 4 on the housing 1, placing the baffle 4 on the terminal block 2 reduces the processing cost and requirements of the housing 1, reduces the risk of uneven stress on the current transformer 3 due to the unevenness of the housing 1, and prevents the housing 1 from being cracked or deformed.

[0105] Furthermore, after the baffle 4 is installed on the terminal 2, it presses the current transformer 3 firmly against the housing 1. There is a force between the baffle 4 and the terminal 2, and simultaneously, there is a force between the baffle 4 and the current transformer 3. The current transformer 3 exerts forces with both the housing 1 and the baffle 4, creating a stable force transmission between the baffle 4, the current transformer 3, and the housing 1. This enhances the structural integrity and mechanical reliability of the circuit breaker.

[0106] In practice, the method by which the baffle 4 is installed on the terminal 2 is not specifically limited here. For example, the baffle 4 can be installed on the terminal 2 by means of snap-fit, screw connection, etc. Of course, it is not limited to this.

[0107] In one possible implementation, the baffle 4 is provided with a clearance hole 41 that mates with the connecting end, and the connecting end passes through the clearance hole 41.

[0108] In actual operation, the connecting end can be passed through the clearance hole 41 first, which can guide the baffle 4 to the correct position. When the circuit breaker vibrates, a shear force will be generated between the baffle 4 and the connecting end. The inner wall of the clearance hole 41 can bear and disperse this force to avoid stress concentration.

[0109] In addition, the baffle 4 is provided with a clearance hole 41 that mates with the connection end, and the baffle 4 has a large area. This indicates that the contact area between the baffle 4 and the current transformer 3 is large, which can improve the stability of pressing the current transformer 3 onto the housing 1.

[0110] Furthermore, since the connection end passes through the through hole of the current transformer 3 and the clearance hole 41 of the baffle 4, it can be concluded that the current transformer 3 is covered and pressed by the baffle 4 on the outer periphery of the corresponding through hole, which effectively improves the balance of the force on the current transformer 3 and reduces the possibility of the current transformer 3 being tilted due to uneven force.

[0111] The shape and size of the clearance hole 41 are determined according to the shape and size of the connection end, and are not specifically limited here.

[0112] In one possible implementation, please refer to Figure 1 , Figure 2 and Figure 4 As shown, at the location of the clearance hole 41, the baffle 4 is provided with an extension 42, which is connected to the terminal block 2.

[0113] Thus, when the baffle 4 is connected to the terminal 2, the contact area and friction between the baffle 4 and the terminal 2 are increased, further improving the stability of the connection between the baffle 4 and the terminal 2.

[0114] Meanwhile, the extension 42 can better resist vibration and shear force, preventing lateral displacement or fretting wear between the baffle 4 and the terminal 2. This makes the baffle 4 and the terminal 2 a better integrated whole, sharing the force, and the vibration energy is more effectively dispersed and absorbed.

[0115] like Figure 4 As shown, mounting holes are provided on the extension 42. In fact, the extension 42 is connected to the terminal block 2 by screws.

[0116] As one possible implementation, the extension 42 extends along the extension direction of the connection end.

[0117] In this way, the extension 42 can fit tightly with the connection end, further increasing the contact area and friction between the baffle 4 and the terminal 2, and improving the connection stability between the baffle 4 and the terminal 2.

[0118] Meanwhile, the extension 42 enables more precise guidance and alignment during assembly, reducing the possibility of the baffle 4 becoming misaligned.

[0119] In addition, the increased mating surface between the baffle 4 and the terminal 2 improves the torsional stiffness and radial stability of the connection, ensuring that the structure will not deform when subjected to unexpected lateral forces.

[0120] In one example, such as Figure 4 As shown, the baffle 4 has heat dissipation holes 43.

[0121] At this point, on the one hand, the placement of the heat dissipation holes 43 reduces the amount of material used in the baffle 4, saving costs. On the other hand, it increases the contact area between the current transformer 3 and the air, allowing the heat from the current transformer 3 to be dissipated more quickly. Furthermore, the heat dissipation holes 43 form air convection channels on the baffle 4, enhancing heat dissipation efficiency.

[0122] In practice, the structure and size of the heat dissipation hole 43 are not limited here, but shall be subject to the actual situation.

[0123] In the embodiments provided in this application, please refer to Figure 1 , Figure 2 and Figure 4 As shown, there are multiple heat dissipation holes 43, which are arranged in an array on the baffle 4.

[0124] In this way, the air insulation layer between the baffle 4 and the transformer 3 can be broken, ensuring that heat can be efficiently dissipated from the surface of the transformer 3, avoiding local heat accumulation, thereby ensuring the overall temperature uniformity of the transformer 3 and improving the measurement accuracy of the transformer 3.

[0125] In addition, the array of multiple heat dissipation holes 43 on the baffle 4 can enhance the aesthetics of the circuit breaker and conform to the aesthetic principles of industrial design.

[0126] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection. A physical connection can be a fixed connection, such as a connection secured by fasteners, such as a connection secured by screws, bolts, or other fasteners; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

Claims

1. A circuit breaker, characterized in that, include: case; A terminal block is disposed in the housing; the connecting end of the terminal block extends to the outside of the housing. A current transformer is detachably mounted on the housing and located outside the housing; the current transformer corresponds to the wiring terminal and has a through hole that mates with the connection end, through which the connection end passes.

2. The circuit breaker according to claim 1, characterized in that, The housing is provided with a recessed portion that mates with the current transformer.

3. The circuit breaker according to claim 2, characterized in that, In the depth direction of the recess, the size of the recess is less than or equal to the size of the current transformer.

4. The circuit breaker according to any one of claims 1-3, characterized in that, The circuit breaker also includes a baffle, the side of which near the housing is pressed against the current transformer to press the current transformer onto the housing.

5. The circuit breaker according to claim 4, characterized in that, The baffle is disposed on the terminal block.

6. The circuit breaker according to claim 5, characterized in that, The baffle is provided with a clearance hole that mates with the connecting end, and the connecting end passes through the clearance hole.

7. The circuit breaker according to claim 6, characterized in that, At the location of the clearance hole, the baffle is provided with an extension, which is connected to the wiring terminal.

8. The circuit breaker according to claim 7, characterized in that, The extension extends along the extension direction of the connecting end.

9. The circuit breaker according to claim 4, characterized in that, The baffle is provided with heat dissipation holes.

10. The circuit breaker according to claim 9, characterized in that, The number of heat dissipation holes is multiple, and the multiple heat dissipation holes are arranged in an array on the baffle.

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