circuit breaker

Abstract

The application provides a circuit breaker, and relates to the technical field of electrical equipment.The circuit breaker comprises a base, a conductor assembly, a first mutual inductor, a second mutual inductor and a support.The base is provided with a mounting cavity, the conductor assembly, the first mutual inductor and the second mutual inductor are arranged in the mounting cavity, and the first mutual inductor and the second mutual inductor are matched with the conductor assembly.A first detection cavity is arranged in the first mutual inductor, and the support is assembled on the first mutual inductor and matched with the cavity wall of the first detection cavity to limit the conductor assembly.A clamping groove is arranged on the support, the second mutual inductor is provided with a wire, and the wire is arranged in the clamping groove.In this way, the support can limit the wire of the second mutual inductor through the clamping groove, the wire of the second mutual inductor is less likely to displace in the base, the wire is more stable in the base, and the wire is less likely to collide with, be extruded by or even be broken by other components in the circuit breaker.

Description

Technical Field

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

[0002] A circuit breaker is a common circuit protection device that controls the connection or disconnection of moving and stationary contacts to switch the state of the conductor components inside the circuit breaker, thereby controlling the on / off state of the circuit.

[0003] To ensure accurate and reliable operation of the circuit breaker, multiple current transformers are installed to monitor parameters such as the current in the conductor components, providing a data basis for the circuit breaker's operation and management. Each current transformer has a conductor to ensure its normal operation and to transmit the sampled signal.

[0004] In related technologies, the way the conductors of the current transformer are installed in the circuit breaker is not reasonable, which makes the conductors of the current transformer easy to be damaged. Utility Model Content

[0005] This application provides a circuit breaker that allows for a more reasonable arrangement of conductors within the circuit breaker, reducing the possibility of conductor damage.

[0006] In a first aspect, this application provides a circuit breaker, including a base, a conductor assembly, a first current transformer, a second current transformer, and a bracket. The base has a mounting cavity, in which the conductor assembly, the first current transformer, and the second current transformer are all disposed, and both the first and second current transformers cooperate with the conductor assembly.

[0007] The first current transformer has a first detection chamber inside. A bracket is assembled on the first current transformer and cooperates with the cavity wall of the first detection chamber to limit the conductor assembly. The bracket is provided with a wire clamping groove, and the second current transformer has a wire that passes through the wire clamping groove.

[0008] In this way, the bracket can limit the conductor of the second current transformer through the wire clamping groove, reducing the possibility of displacement of the conductor in the base, making the conductor more stable in the base, and reducing the possibility of collision, squeezing or even breakage of the conductor with other components in the circuit breaker.

[0009] Optionally, the conductor assembly includes multiple conductors, with a portion of the support extending into the first detection cavity and engaging with at least a portion of the cavity wall of the first detection cavity to form multiple detection sub-cavities. Different conductors pass through different detection sub-cavities. The second current transformer has a second detection cavity, and there are multiple second current transformers. Different conductors pass through the second detection cavities of different second current transformers. The wires of the multiple second current transformers are all passed through wire clamping grooves.

[0010] The bracket of this application can integrate the function of isolating the conductor and limiting the wire, reducing the possibility of setting up other structures to limit the wire and reducing the cost of the circuit breaker.

[0011] Optionally, the circuit breaker has intersecting first and second directions. First and second current transformers are distributed along the first direction, and multiple second current transformers are distributed along the second direction. Multiple cable clamps are provided, distributed along the second direction. In the second direction, multiple second current transformers correspond to multiple cable clamps, and the conductors of the second current transformers pass through the corresponding cable clamps.

[0012] This allows for neater wiring of multiple wires, reducing the possibility of wires crossing each other, making them prone to errors and omissions, and making maintenance difficult, further reducing the possibility of wire damage.

[0013] Optionally, the bracket includes an isolation section and a fixing section connected to each other. The isolation section is located in the first detection chamber and cooperates with at least a portion of the cavity wall of the first detection chamber to form a detection sub-cavity. The fixing section is located outside the first detection chamber. A wire-clamping plate is provided on the fixing section, and the wire-clamping plate has through holes forming wire-clamping grooves. The fixing section is located on the side of the first current transformer facing the second current transformer.

[0014] In this way, the wire clamping groove formed on the wire clamping plate can be located on the side close to the second current transformer, which makes it easier for the wire clamping plate to limit the wire and reduce the possibility of the wire needing to be arranged in a roundabout way.

[0015] Optionally, the through hole has a wire-passing notch on its wall, which extends through the wire-holding plate. The wire passes through the wire-passing notch into the wire-holding groove.

[0016] This makes it easier to thread the wires through the wire slot.

[0017] Optionally, the circuit breaker also includes a partition, which includes a first limiting part and a second limiting part connected to each other. The first limiting part is located in the first detection chamber, and the second limiting part is located on the side of the first current transformer opposite to the second current transformer. The first limiting part cooperates with the isolation part to limit the portion of the conductor located in the first detection chamber.

[0018] With the above configuration, the first limiting part and the isolation part can cooperate to limit and isolate a portion of the conductor in the first detection cavity.

[0019] Optionally, the circuit breaker has a first direction, and the first current transformer and the second current transformer are distributed along the first direction. In the first direction, the conductor includes a first conductor, a second conductor, and a third conductor that are interconnected, with the second conductor located in a first detection cavity and the third conductor located on the side away from the second current transformer.

[0020] The first conductor, facing the first current transformer, mates with the fixing part. And / or, the third conductor, facing the first current transformer, mates with the second limiting part.

[0021] In this way, the second limiting part and the fixing part can also limit the conductors on different sides of the first current transformer, reducing the possibility of multiple conductors colliding with each other outside the first current transformer.

[0022] Optionally, the circuit breaker also includes a middle cover, which is disposed within the mounting cavity. The middle cover has a first wire hole, and a circuit board is disposed on the side of the middle cover opposite to the base. A portion of the wires located on the side of the wire slot away from the second current transformer extends out of the base through the first wire hole and is electrically connected to the circuit board.

[0023] In this way, the conductor can extend from the base through the first conductor hole and be electrically connected to the circuit board. This allows the second current transformer to transmit the detected information to the circuit board, enabling the circuit board to determine the operating status of the circuit breaker and make control decisions based on this information.

[0024] Optionally, a second wire hole is also provided on the middle cover, which is spaced apart from the first wire hole. The first current transformer has a lead wire that extends out of the base through the second wire hole and is electrically connected to the circuit board.

[0025] This application directly sets the guide wire to extend from the second wire hole, which makes the arrangement of the guide wire simpler and more convenient.

[0026] Optionally, the circuit breaker may also include a trip unit with trip unit leads, which are also routed through a cable tray.

[0027] In this way, the cable slot can also limit the trip unit lead wire, reducing the possibility of displacement of the trip unit lead wire and thus damage. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a circuit breaker according to an embodiment of this application.

[0029] Figure 2 for Figure 1 The diagram shown is a schematic of the circuit breaker after the base has been removed.

[0030] Figure 3 This is a schematic diagram illustrating the assembly of a first current transformer, a bracket, a conductor assembly, and a partition according to an embodiment of this application.

[0031] Figure 4 This is an exploded view of a first current transformer, bracket, conductor assembly, and partition according to an embodiment of this application.

[0032] Figure 5 This is a schematic diagram of a second mutual inductor according to an embodiment of this application.

[0033] Figure 6 This is a schematic diagram of a third mutual inductor according to an embodiment of this application.

[0034] Figure 7 This is a schematic diagram of a bracket according to an embodiment of this application.

[0035] Figure 8 This is a schematic diagram of a cover according to an embodiment of this application.

[0036] Figure 9 This is a schematic diagram of the fit between the cover and the base according to an embodiment of this application.

[0037] Figure 10 This is a schematic diagram of a trip unit according to an embodiment of this application.

[0038] Explanation of reference numerals in the attached figures: 100: Circuit breaker; 10: Base; 101: Mounting cavity; 20: Conductor assembly; 21: Conductor; 30: First current transformer; 31: First detection cavity; 301: Lead wire; 40: Second current transformer; 41: Second detection cavity; 401: Wire; 402: Terminal block; 50: Bracket; 51: Wire clamping groove; 52: Isolation part; 53: Fixing part; 54: Wire clamping plate; 541: Through hole; 542: Wire passing notch; 60: Partition plate; 61: First limiting part; 62: Second limiting part; 70: Middle cover; 71: First wire hole; 72: Second wire hole; 80: Trip unit; 801: Trip unit lead wire; 90: Third current transformer; 901: Connecting wire; X: First direction; Y: Second direction. 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, 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.

[0040] 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.

[0041] 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.

[0042] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0043] 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.

[0044] 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.

[0045] 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).

[0046] In the description of this application, it should be noted that, unless otherwise explicitly 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, such as a fixed connection, for example, a connection fixed by a partition, such as a connection fixed by screws, bolts, or other partitions; 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 based on the specific circumstances.

[0047] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0048] A circuit breaker is a common circuit protection device, comprising a base, a middle cover, moving contacts, stationary contacts, and conductor assemblies. The moving contacts, stationary contacts, and conductor assemblies work together to form the main circuit of the circuit breaker. The moving contact can move relative to the stationary contact to connect or disconnect the main circuit, thereby closing or opening the circuit breaker. The moving contacts, stationary contacts, and conductor assemblies are housed in the base, and the middle cover is mounted on the base, providing limit functions for the moving contacts, stationary contacts, and other components.

[0049] Generally, both the base and the middle cover are provided with protruding ribs. The ribs on the base abut against the ribs on the middle cover to make the position of each component between the base and the middle cover more reliably fixed.

[0050] To ensure the circuit breaker operates more accurately and reliably, it is equipped with a control circuit board and multiple instrument transformers. The instrument transformers monitor parameters such as the current of the conductor components and transmit the detected parameter information to the control circuit board so that the control circuit board can control the operation of the circuit breaker.

[0051] Typically, the current transformer is positioned between the middle cover and the base, and works in conjunction with the conductor assembly, while the control circuit board is located on the side of the middle cover facing away from the base. This requires the transformer's wires to extend from the base side to the middle cover side. However, the base side has more wires, and insufficient management and securing of these wires in existing technologies makes them prone to displacement between the base and the middle cover. With this configuration, the wires are highly susceptible to shifting towards the ribs, where they can be squeezed or even broken by the middle cover.

[0052] Based on the above, this application proposes a circuit breaker 100. The circuit breaker 100 provided in the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0053] Reference Figure 1 and Figure 2As shown, the circuit breaker 100 includes a base 10, a conductor assembly 20, a first current transformer 30, a second current transformer 40, and a support 50. The base 10 has a mounting cavity 101, in which the conductor assembly 20, the first current transformer 30, and the second current transformer 40 are all disposed, and both the first current transformer 30 and the second current transformer 40 cooperate with the conductor assembly 20. Thus, both the first current transformer 30 and the second current transformer 40 can detect the parameters of the current flowing in the conductor assembly 20, ensuring the safe and reliable operation of the circuit breaker 100.

[0054] Continue to refer to Figure 3 and Figure 4 The first current transformer 30 has a first detection cavity 31 inside, and the conductor assembly 20 can pass through the first detection cavity 31. In this way, the first current transformer 30 can detect a portion of the conductor assembly 20 located in the first detection cavity 31 to obtain parameters of the current flowing in the conductor assembly 20.

[0055] In this embodiment, the circuit breaker 100 further includes a bracket 50, which is mounted on the first current transformer 30 and cooperates with the cavity wall of the first detection cavity 31 to limit the position of the conductor assembly 20. This makes the position of the conductor assembly 20 in the first detection cavity 31 more definite, reducing the possibility of the conductor assembly 20 shaking or colliding within the first detection cavity 31, thereby reducing the possibility that the unstable position of the conductor assembly 20 might affect the detection accuracy of the first current transformer 30.

[0056] In this application, the second current transformer 40 has a conductor 401, through which the second current transformer 40 can transmit detected information, etc. Since the bracket 50 is provided with a wire-clamping groove 51, after the second current transformer 40 is installed, the conductor 401 can be threaded through the wire-clamping groove 51. In this way, the bracket 50 can limit the conductor 401 of the second current transformer 40 through the wire-clamping groove 51, reducing the possibility of displacement of the conductor 401 in the base 10, making the conductor 401 more stable in the base 10, and reducing the possibility of the conductor 401 colliding with, being squeezed by, or even breaking from other components in the circuit breaker 100.

[0057] It is understood that in this embodiment of the application, the circuit breaker 100 has multiple current transformers, including a first current transformer 30 and a second current transformer 40. The bracket 50 can limit the conductor 401 of the second current transformer 40 through the wire clamping groove 51, so that the arrangement of the conductor 401 of the second current transformer 40 is more reasonable, reducing the number of conductors 401 in the base 10 in a free state, thereby reducing the possibility that the free conductors 401 will have too much influence on the arrangement of various components in the base 10 and the cooperation between the base 10 and other components, and reducing the possibility of damage to the conductors 401.

[0058] In this embodiment, the circuit breaker 100 can be of different types, such as a 3P circuit breaker or a 3P+N circuit breaker. Thus, the conductor assembly 20 can include multiple conductors 21. The first current transformer 30 and the second current transformer 40 can cooperate with the multiple conductors 21 in different ways to detect different parameters of the conductor assembly 20, thereby evaluating the operating status of the circuit breaker 100 from different dimensions and making the operation of the circuit breaker 100 more reliable.

[0059] Specifically, such as Figure 3 and Figure 4 As shown, the bracket 50 can be partially inserted into the first detection cavity 31. In this way, the portion of the bracket 50 inserted into the first detection cavity 31 can cooperate with at least a portion of the cavity wall of the first detection cavity 31 to form multiple detection sub-cavities. Different conductors 21 can be inserted into different detection sub-cavities.

[0060] And combined Figure 2 and Figure 5 As shown, the second current transformer 40 has a second detection cavity 41, and there are multiple second current transformers 40, with different conductors 21 passing through the second detection cavities 41 of different second current transformers 40.

[0061] In this embodiment, the wires 401 of the multiple second current transformers 40 can all be threaded through the wire clamping groove 51. In this way, the wire clamping groove 51 can limit the movement of the wires 401 of the multiple second current transformers 40, reducing the possibility that the wires 401 of the multiple second current transformers 40 would be messy and easily displaced within the base 10, thereby reducing the possibility of insufficient fixation of the multiple wires 401 and easy damage to them.

[0062] It should be noted that in this embodiment, the first current transformer 30 and the second current transformer 40 are coupled to the conductor assembly 20 in different ways, and the first current transformer 30 and the second current transformer 40 can be different types of current transformers. Specifically, the first current transformer 30 can be a zero-sequence current transformer, and the second current transformer 40 can be a single-phase open-type current transformer or a metering transformer, etc.

[0063] Multiple conductors 21 are inserted into the first detection cavity 31, which can detect the vector sum of the currents in the multiple conductors 21, thereby determining whether there is a leakage problem in the conductor assembly 20.

[0064] There are multiple second current transformers 40, and each conductor 21 can be installed in one second current transformer 40. When the second current transformer 40 is a single-phase open-type current transformer, each second current transformer 40 can detect the current passing through its own conductor 21 to determine whether each conductor 21 is working properly and whether there are overload or short circuit problems.

[0065] When the second current transformer 40 is a metering current transformer, each second current transformer 40 can also detect the current passing through its own conductor 21. The single-phase open-type current transformer and the metering current transformer have different ranges and accuracies, and one can be selected and installed in the circuit breaker 100 as needed.

[0066] As a preferred embodiment, the circuit breaker 100 may further include a third current transformer 90, such as Figure 2 and Figure 6 As shown. The second current transformer 40 can be either a single-phase open-type current transformer or a metering transformer, and the third current transformer 90 can be either a single-phase open-type current transformer or a metering transformer. In this case, each conductor 21 can be sequentially installed in the single-phase open-type current transformer and the metering transformer.

[0067] It is understandable that, corresponding to the wire 401 of the second current transformer 40, the third current transformer 90 may also have a connecting wire 901. In this case, the connecting wire 901 can also be limited by the wire clamping groove 51 on the bracket 50, as detailed in the subsequent description.

[0068] In this embodiment, a portion of the support 50 located in the first detection cavity 31 can divide the first detection cavity 31 to form a detection sub-cavity through which a single conductor 21 can pass. Thus, the conductor 21 can be confined within the detection sub-cavity, thereby limiting the range of motion of the conductor 21 within the first current transformer 30. This significantly reduces the possibility of mechanical collisions between different conductors 21 and improves the insulation effect between different conductors 21, as well as the reliability of the first current transformer 30.

[0069] In summary, in this application, the bracket 50 can cooperate with the first detection cavity 31 to isolate multiple conductors 21, improving the reliability of the first current transformer 30's detection of the conductor assembly 20. Simultaneously, the bracket 50 is also provided with a wire-locking groove 51, which can limit the movement of the conductor 401 of the second current transformer 40. That is, the bracket 50 of this application can integrate the isolation function for the conductor 21 and the limiting function for the conductor 401, reducing the possibility of needing additional structures to limit the conductor 401 and reducing the cost of the circuit breaker 100.

[0070] To clarify the arrangement of multiple current transformers and their interaction with conductor assembly 20, specific descriptions will be provided using different types of circuit breakers 100. The following description uses a circuit breaker 100 equipped with a first current transformer 30, a second current transformer 40, and a third current transformer 90 as an example. The same method can also be used as a reference for a circuit breaker 100 equipped with only the first current transformer 30 and the second current transformer 40.

[0071] When the circuit breaker 100 is a 3P circuit breaker, the conductor assembly 20 includes three conductors 21, and the conductors 21 are phase wires. In this case, the second current transformer 40 can be three single-phase open-type current transformers, and the third current transformer 90 can be three metering current transformers. The three conductors 21 can first be respectively installed in the three metering current transformers, and then respectively installed in the three single-phase open-type current transformers. Afterwards, the three conductors 21 can be jointly installed in the zero-sequence current transformer.

[0072] When the circuit breaker 100 is a 3P+N circuit breaker, the conductor assembly 20 includes four conductors 21, of which three conductors 21 are phase conductors and one conductor 21 is a neutral conductor. In this case, the second current transformer 40 can be four single-phase open-type current transformers, and the third current transformer 90 can be four metering current transformers. The four conductors 21 can first be installed separately in the four metering current transformers, and then separately in the four single-phase open-type current transformers. Afterwards, the four conductors 21 can be jointly installed in the zero-sequence current transformer.

[0073] In some embodiments, such as Figure 2 As shown, the circuit breaker 100 has an intersecting first direction X and a second direction Y. The first current transformer 30 and the second current transformer 40 are distributed along the first direction X, and a plurality of second current transformers 40 can be distributed along the second direction Y.

[0074] In this application, multiple conductors 21 in the conductor assembly 20 can be distributed along a second direction Y, while each conductor 21 can extend along a first direction X. Thus, the multiple conductors 21 can correspondingly engage with multiple second current transformers 40. The first current transformer 30 and the second current transformer 40 are distributed along the first direction X, thereby enabling multiple conductors 21 to engage with both the first current transformer 30 and the second current transformer 40, achieving multi-dimensional detection of the conductor assembly 20.

[0075] In the embodiments of this application, such as Figure 3 and Figure 7 As shown, there are multiple wire-locking slots 51, which are distributed along the second direction Y. Thus, the distribution direction of the multiple wire-locking slots 51 is consistent with the distribution direction of the multiple second current transformers 40, ensuring that the multiple second current transformers 40 correspond to the multiple wire-locking slots 51 in the second direction Y.

[0076] Thus, the conductor 401 of the second current transformer 40 can be threaded through the corresponding wire slot 51. For example, if the conductor assembly 20 includes three conductors 21, the number of wire slots 51 can also be three. In the circuit breaker 100... Figure 2 When placed in the indicated orientation, the wire 401 of the second current transformer 40 on the left can be passed through the wire clamping groove 51 on the left, the wire 401 of the second current transformer 40 on the right can be passed through the wire clamping groove 51 on the right, and the second current transformer 40 in the middle can be passed through the wire clamping groove 51 in the middle.

[0077] In this way, when multiple second current transformers 40 are set, the wiring of multiple wires 401 can be made neater, reducing the possibility of multiple wires 401 crossing each other, easy to make mistakes and omissions, and difficult to maintain, and further reducing the possibility of damage to wires 401.

[0078] When a third current transformer 90 is also provided in the circuit breaker 100, the third current transformer 90 and the second current transformer 40 are distributed along the first direction X, and the multiple third current transformers 90 are also distributed along the second direction Y, with each of the multiple third current transformers 90 corresponding to one of the multiple second current transformers 40. Figure 2 , Figure 5 and Figure 6 As shown. When arranging the connecting wire 901 of the third current transformer 90, the connecting wire 901 of the third current transformer 90 can also be passed through the wire clamping groove 51 through which the wire 401 of the second current transformer 40 opposite to the third current transformer 90 passes.

[0079] It should be noted that the first direction X intersects the second direction Y, and the first direction X and the second direction Y can have an angle of approximately 90°, so that the multiple first current transformers 30 and the second current transformers 40 are distributed along the first direction X. In the embodiments of this application, the angle can be 75°, 80°, 87°, or 94°, etc. As a preferred embodiment, the first direction X and the second direction Y can be perpendicular to each other. The specific angle value of the angle between the first direction X and the second direction Y is not specifically limited in the embodiments of this application.

[0080] Of course, in addition to the above-mentioned configuration, the wire slot 51 can also have other configurations. For example, only one wire slot 51 can be provided, in which case the wires 401 of multiple second current transformers 40 are all passed through this one wire slot 51, etc. This application does not make specific limitations on this.

[0081] In some embodiments, such as Figure 3 , Figure 4 and Figure 7As shown, the bracket 50 includes an isolation part 52 and a fixing part 53 connected to each other. The isolation part 52 is located in the first detection cavity 31 and cooperates with at least a portion of the cavity wall of the first detection cavity 31 to form a detection sub-cavity. The fixing part 53 is located outside the first detection cavity 31.

[0082] With the above configuration, the isolation part 52 can limit the portion of the conductor 21 that extends into the first detection cavity 31. The fixing part 53 is located outside the first detection cavity 31, which can limit the wire 401 and the connecting wire 901 while minimizing the impact on the normal operation of each current transformer.

[0083] Specifically, such as Figure 2 , Figures 5 to 7 As shown, a wire-clamping plate 54 is provided on the fixing part 53, and a through hole 541 is provided on the wire-clamping plate 54, forming a wire-clamping groove 51. In this way, the wire 401 and / or the connecting wire 901 can pass through the through hole 541, and the parts of the wire-clamping plate 54 without the through hole 541 can limit the wire 401 and / or the connecting wire 901, reducing the possibility of damage to the wire 401 and / or the connecting wire 901.

[0084] In this embodiment, the fixing part 53 is located on the side of the first current transformer 30 facing the second current transformer 40. In this way, the wire clamping plate 54 can be located on the side closer to the second current transformer 40, which makes it easier for the wire clamping plate 54 to limit the wire 401 of the second current transformer 40 and reduce the possibility that the wire 401 needs to be arranged in a roundabout way.

[0085] The following description uses the interaction between wire 401 and wire clamp 54 as an example. For the interaction between wire 901 and wire clamp 54, please refer to the relevant description.

[0086] To facilitate the passage of the wire 401 through the through hole 541, a wire-passing notch 542 can be provided on the wall of the through hole 541. The wire-passing notch 542 passes through the wire-holding plate 54, such as... Figure 2 , Figures 5 to 7 As shown. In this way, the wire-passing notch 542 can connect the through hole 541 in the middle of the wire-passing plate 54 with the space outside the wire-passing plate 54. Thus, the wire 401 can pass through the wire-passing notch 542 and be inserted into the wire-passing groove 51.

[0087] In this design, after the conductor 401 is fitted into the cable tray 51, to reduce the possibility of the conductor 401 detaching from the cable tray 51 through the wire pass-through notch 542 when the circuit breaker 100 shakes or vibrates, the size of the cable tray 51 can be smaller than the size of the conductor 401. Thus, when installing the conductor 401, force can be applied to the cable clamp 54 first, causing it to deform at the wire pass-through notch 542, thereby expanding the notch. At this point, the conductor 401 can pass through the wire pass-through notch 542 into the cable tray 51. Afterwards, the force applied to the cable clamp 54 can be released, allowing it to return to its original shape. At this point, because the wire pass-through notch 542 is small, the conductor 401 is less likely to detach from the cable tray 51.

[0088] Understandably, in order to allow the wire clamping plate 54 to deform, it can be made of a material with a certain degree of elasticity, such as plastic. The bracket 50 can also be made of plastic, thus providing insulation and better isolation for the multiple conductors 21.

[0089] In the embodiments of this application, the wire clamping plate 54 and the bracket 50 can be integrally formed, or they can be bonded or snapped together. The embodiments of this application do not make specific limitations on this.

[0090] In some embodiments, such as Figure 1 , Figures 2 to 4 As shown, the circuit breaker 100 also includes a partition 60, which includes a first limiting part 61 and a second limiting part 62 connected to each other. The first limiting part 61 is located in the first detection cavity 31, and the second limiting part 62 is located on the side of the first current transformer 30 opposite to the second current transformer 40. The first limiting part 61 and the isolation part 52 can cooperate to limit the portion of the conductor 21 located in the first detection cavity 31.

[0091] With the above configuration, on the one hand, the first limiting part 61 and the isolation part 52 can cooperate to limit and isolate part of the conductor 21 in the first detection cavity 31. On the other hand, the second limiting part 62 and the fixing part 53 can also limit the conductor 21 on different sides of the first current transformer 30, reducing the possibility of multiple conductors 21 colliding with each other outside the first current transformer 30.

[0092] Specifically, in the first direction X, conductor 21 includes a first conductor, a second conductor, and a third conductor that are interconnected. The second conductor is located in the first detection cavity 31, and the third conductor is located on the side away from the second current transformer 40. Thus, the side of the first conductor facing the second conductor and the side of the third conductor facing the second conductor are the portions of conductor 21 that pass through the first current transformer 30 before and after it.

[0093] In this embodiment, the fixing part 53 can cooperate with the side of the first conductor facing the first current transformer 30 to limit the first conductor facing the first current transformer 30. And / or, the second limiting part 62 can cooperate with the side of the third conductor facing the first current transformer 30 to limit the third conductor facing the first current transformer 30. In this way, the portion of the conductor 21 that enters before the first current transformer 30, and / or the portion that enters after the first current transformer 30, can also be limited, which can reduce the possibility of multiple conductors 21 located outside the first current transformer 30 colliding with each other and thus causing wear.

[0094] In this application, the isolation part 52 and the first limiting part 61 can also be combined in different ways. For example, the size of the first limiting part 61 can be smaller than the size of the isolation part 52, the bracket 50 and the partition 60 can be inserted into the first current transformer 30 from different directions, and the isolation part 52 is sleeved on the side of the first limiting part 61 that is away from the second limiting part 62.

[0095] Alternatively, the size of the first limiting part 61 can be larger than the size of the isolation part 52, the bracket 50 and the partition 60 can be inserted into the first current transformer 30 from different directions, and the first limiting part 61 is sleeved on the side of the isolation part 52 away from the fixing part 53.

[0096] Alternatively, the size of the first limiting part 61 may be similar to the size of the isolation part 52, and the side of the isolation part 52 opposite to the fixing part 53 may be engaged with the side of the first limiting part 61 opposite to the second limiting part 62, etc. In this embodiment, no specific limitation is made.

[0097] It is understood that in the above embodiments, the partition 60 and the bracket 50 can cooperate to limit the conductor 21 located in the first detection cavity 31. In other embodiments, the partition 60 may not be provided, and the isolation part 52 can extend from one side of the first detection cavity 31 to the other side, cooperating with the cavity wall of the first detection cavity 31 to limit the conductor 21 located in the first detection cavity 31.

[0098] In some embodiments, such as Figure 1 , Figure 2 , Figure 8 and Figure 9 As shown, the circuit breaker 100 may further include a middle cover 70, which covers the mounting cavity 101. The middle cover 70 is provided with a first wire hole 71, and a circuit board is provided on the side of the middle cover 70 away from the base 10. A portion of the wire 401 located on the side of the wire slot 51 away from the second current transformer 40 can extend out of the base 10 through the first wire hole 71 and be electrically connected to the circuit board.

[0099] In this way, the wire 401 extending from the wire slot 51 can extend from the base 10 through the first wire hole 71 and be electrically connected to the circuit board. This allows the second current transformer 40 to transmit the detected information to the circuit board, so that the circuit board can judge the operating status of the circuit breaker 100 and make control decisions based on this information.

[0100] That is, in the embodiment of this application, the wire 401 of the second current transformer 40 can first be inserted into the wire slot 51, and then extend from one side of the base 10 through the first wire hole 71 and reach the circuit board on the middle cover 70.

[0101] Understandably, a connector 402 is also provided on the side of conductor 401 facing away from the second current transformer 40, such as... Figure 5 As shown. When connecting the second current transformer 40 and the circuit board, the connector 402 can be electrically connected to the circuit board. That is, in this application, both the wire 401 and the connector 402 extend from the first wire hole 71. It should be noted that, in addition to the second current transformer 40 having a wire 401, the first current transformer 30 also needs to be electrically connected to the circuit board to achieve signal transmission. Specifically, the first current transformer 30 may have a lead wire 301, which is electrically connected to the circuit board.

[0102] In this application, the middle cover 70 is also provided with a second wire hole 72, which is spaced apart from the first wire hole 71. In this way, the guide wire 301 can extend out of the base 10 through the second wire hole 72 and be electrically connected to the circuit board.

[0103] This application directly sets the guide wire 301 to extend from the second conductor hole 72, which makes the arrangement of the guide wire 301 simpler and more convenient. Specifically, the zero-sequence current transformer is generally ring-shaped, with a lead-out boss on one side, and the guide wire 301 is led out from the lead-out boss.

[0104] In this application, the fixing part 53 on the bracket 50 is located outside the zero-sequence current transformer, so that the output plate and the output boss are spaced apart in the first direction X and in the direction from the middle cover 70 to the base 10. The above-mentioned arrangement of this application can reduce the possibility of wiring confusion caused by limiting the guide wire 301 through the wire clamping groove 51, shorten the wiring path of the guide wire 301 on the base 10 side, and reduce the possibility of displacement of the guide wire 301.

[0105] In this design, the lead-out protrusion of the first current transformer 30 can be positioned facing the middle cover 70. The middle cover 70 can be fitted with a snap-fit ​​groove, allowing the lead-out protrusion to be embedded in the groove when it mates with the base 10. This engagement of the lead-out protrusion and the middle cover 70 can, to some extent, limit the movement of the guide wire 301, reducing the possibility of the guide wire 301 displacing within the base 10 by crossing the lead-out protrusion.

[0106] In summary, in this embodiment, the bracket 50 can limit the movement of the wire 401 and the connecting wire 901 through the wire-locking groove, while the wire-out boss and the locking groove can limit the movement of the guide wire 301. The above-mentioned features of this application can reduce the displacement of the wire 401, the connecting wire 901, and the guide wire 301 within the base 10, thus reducing the possibility that the wire 401, the connecting wire 901, and the guide wire 301 may be located at the position where the middle cover 70 and the base 10 are fastened, and thus be crushed.

[0107] In some embodiments, such as Figure 1 , Figure 2 and Figure 10 As shown, the circuit breaker 100 also includes a trip unit 80. The trip unit 80 can control the separation of the moving and stationary contacts to cut off the fault current when the circuit breaker 100 is malfunctioning, so as to avoid equipment damage and personal danger. It also needs to be electrically connected to the circuit board.

[0108] The trip unit 80 has a trip unit lead 801, which can also be threaded through the wire clamping groove 51. In this way, the wire clamping groove 51 can limit the trip unit lead 801, reducing the possibility of displacement of the trip unit lead 801 and thus damage.

[0109] In the case of multiple cable slots 51, the trip unit lead 801 can be embedded in any one of the cable slots. As a preferred embodiment, the trip unit lead 801 can be placed in the cable slot closest to it.

[0110] It should be noted that, in addition to the wire 401, the aforementioned lead wire 301, connecting wire 901 and trip unit lead wire 801 can all be provided with a connector 402, and the lead wire 301, connecting wire 901 and trip unit lead wire 801 can be connected to the circuit board through the connector 402.

[0111] Furthermore, the wires 401 of the multiple second current transformers 40 can be connected to a single terminal block 402, or they can be connected to separate terminals 402; this application does not specifically limit this.

[0112] It should be noted that although the second current transformer 40 is referred to as a "wire" in this application, it does not refer to a single conductive connecting wire, but can be a collection of several connecting wires. For example, wire 401 may include two connecting wires, or other numbers of connecting wires. The same applies to the lead wire 301, the connecting wire 901, and the trip unit lead wire 801.

[0113] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A circuit breaker, characterized in that, Includes a base, conductor assembly, first current transformer, second current transformer, and support frame; The base is provided with a mounting cavity, and the conductor assembly, the first current transformer and the second current transformer are all disposed in the mounting cavity, and the first current transformer and the second current transformer are all in cooperation with the conductor assembly. The first current transformer has a first detection cavity inside, and the bracket is assembled on the first current transformer and cooperates with the cavity wall of the first detection cavity to limit the conductor assembly. The bracket is provided with a wire slot, and the second current transformer has a wire that passes through the wire slot.

2. The circuit breaker according to claim 1, characterized in that, The conductor assembly includes a plurality of conductors, a portion of the support extends into the first detection cavity and cooperates with at least a portion of the cavity wall of the first detection cavity to form a plurality of detection sub-cavities, with different conductors passing through different detection sub-cavities; The second current transformer has a second detection cavity, and there are multiple second current transformers, with different conductors passing through the second detection cavities of different second current transformers; The wires of the multiple second current transformers are all passed through the wire clamping groove.

3. The circuit breaker according to claim 2, characterized in that, The circuit breaker has intersecting first and second directions, the first current transformer and the second current transformer are distributed along the first direction, and a plurality of the second current transformers are distributed along the second direction; The number of the wire-locking slots is multiple, and the multiple wire-locking slots are distributed along the second direction; In the second direction, a plurality of second current transformers correspond to a plurality of said wire slots, and the wires of the second current transformers pass through the corresponding said wire slots.

4. The circuit breaker according to claim 2, characterized in that, The bracket includes an isolation part and a fixing part connected to each other. The isolation part is located in the first detection cavity and cooperates with at least a portion of the cavity wall of the first detection cavity to form the detection sub-cavity. The fixing part is located outside the first detection cavity. The fixing part is provided with a wire clamping plate, and the wire clamping plate is provided with a through hole, which forms the wire clamping groove; The fixing part is located on the side of the first current transformer facing the second current transformer.

5. The circuit breaker according to claim 4, characterized in that, The through hole has a wire-passing notch on its wall, and the wire-passing notch penetrates the wire-holding plate. The wire passes through the wire-passing notch into the wire-holding groove.

6. The circuit breaker according to claim 4, characterized in that, The circuit breaker also includes a partition, which includes a first limiting part and a second limiting part connected to each other. The first limiting part is located in the first detection cavity, and the second limiting part is located on the side of the first current transformer away from the second current transformer. The first limiting part cooperates with the isolation part to limit the portion of the conductor located in the first detection cavity.

7. The circuit breaker according to claim 6, characterized in that, The circuit breaker has a first direction, and the first current transformer and the second current transformer are distributed along the first direction; In the first direction, the conductor includes a first conductor, a second conductor, and a third conductor connected to each other, the second conductor being located in the first detection cavity, and the third conductor being located on the side away from the second current transformer; The side of the first conductor facing the first current transformer mates with the fixing part; And / or, the third conductor, on the side facing the first current transformer, cooperates with the second limiting part.

8. The circuit breaker according to claim 1, characterized in that, The circuit breaker also includes a middle cover, which is disposed in the mounting cavity. The middle cover is provided with a first wire hole, and a circuit board is provided on the side of the middle cover opposite to the base. The portion of the conductor located on the side of the wire slot away from the second current transformer extends out of the base through the first wire hole and is electrically connected to the circuit board.

9. The circuit breaker according to claim 8, characterized in that, The middle cover is also provided with a second wire hole, which is distributed at intervals from the first wire hole; The first current transformer has a lead wire that extends out of the base through the second wire hole and is electrically connected to the circuit board.

10. The circuit breaker according to any one of claims 1-9, characterized in that, The circuit breaker also includes a trip unit, which has a trip unit lead, and the trip unit lead is also passed through the wire clamping groove.

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