Magnetic tripping mechanism and circuit breaker

Abstract

The utility model provides a magnetic tripping mechanism and a circuit breaker, and relates to the technical field of low-voltage electric appliances. A magnetic tripping mechanism comprises a magnetic core assembly and a magnetic flux coil, the periphery of the magnetic core assembly is sleeved with the magnetic flux coil, the magnetic flux coil is connected into a circuit through two connecting lines, and the cross section area of at least one connecting line is larger than that of an electric wire in the magnetic flux coil. According to the magnetic tripping mechanism, the magnetic flux coil is connected with the wiring board or the static contact through the independent connecting line, and replacement and maintenance are facilitated. The cross-sectional area of the connecting line is larger than that of the wire in the magnetic flux coil, so that the strength of the connecting line is improved, and the connecting line is prevented from being broken after being bent. According to the circuit breaker provided by the utility model, the strength of the connecting line is improved by increasing the cross sectional area of the connecting line, the connecting line is ensured not to be broken due to bending in the assembling process of the circuit breaker, and the product quality and the yield of the circuit breaker are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a magnetic tripping mechanism and a circuit breaker. Background Art

[0002] The instantaneous flux protection coils in the magnetic trip mechanisms of existing miniature circuit breakers typically have their wires directly routed to an external terminal block or static contact. Due to current characteristics, the flux protection coil wires are too thin. During the assembly process of the finished circuit breaker, the wires connecting the flux protection coils to the terminal block or static contact are inevitably bent. These thin wires can be damaged or even broken after a few bends, causing the product to become non-conductive. Therefore, an improvement solution was needed. Utility Model Content

[0003] The purpose of the present utility model is to provide a magnetic tripping mechanism and a circuit breaker to solve the above technical problems.

[0004] In the first aspect, an embodiment of the present invention provides a magnetic tripping mechanism, which includes: a magnetic core assembly and a magnetic flux coil, wherein the magnetic flux coil is sleeved on the outer periphery of the magnetic core assembly, and the magnetic flux coil is connected to the circuit via two connecting wires, and the cross-sectional area of ​​at least one section of the connecting wire is larger than the cross-sectional area of ​​the wire in the magnetic flux coil.

[0005] Furthermore, at least one section of the connecting line includes at least two conductors, and the at least two conductors are parallel.

[0006] Furthermore, at least two conductors in the same section of the connecting wire include a lead-out wire and at least one protective wire, the magnetic flux coil is connected to the circuit via the terminal end of the connecting wire, and at least one end of the protective wire is connected to the terminal end of the connecting wire.

[0007] Furthermore, at least two conductors in the same section of the connecting wire include a lead-out wire and at least one protective wire, the magnetic flux coil is connected to the circuit via the connection terminal of the connecting wire, at least one protective wire includes at least two sub-segments whose ends are connected in sequence, and the at least two sub-segments in the same protective wire are arranged side by side.

[0008] Furthermore, at least two conductors in the same section of the connecting wire include a lead-out wire and at least one protective wire, the magnetic flux coil is connected to the circuit via the terminal end of the connecting wire, and the protective wire is a non-wound wire.

[0009] Furthermore, in the at least two conductors in the same section of the connecting line, each conductor includes a conductor portion and an insulating layer.

[0010] Furthermore, an insulating protective sleeve is provided on the outer periphery of the magnetic flux coil, and the insulating protective sleeve is located between the protective wire and the magnetic flux coil.

[0011] Furthermore, the cross-sectional area of ​​at least one section of the connecting line is greater than 1 mm2.

[0012] Furthermore, the magnetic core assembly includes a first wiring unit and a second wiring unit, the first wiring unit is provided with a support frame, the second wiring unit is provided on the support frame, the second wiring unit is provided with a winding post, and the magnetic flux coil is wound on the winding post.

[0013] On the other hand, an embodiment of the present invention further provides a circuit breaker, which includes a contact assembly, a terminal and any of the above magnetic tripping mechanisms, wherein the magnetic flux coil of the magnetic tripping mechanism is electrically connected to the contact assembly and the terminal via two connecting wires.

[0014] The magnetic trip mechanism provided by this utility model connects the flux coil to the terminal block or static contact by providing a separate connecting wire, making replacement and maintenance easier. The cross-sectional area of ​​the connecting wire is larger than the cross-sectional area of ​​the conductor in the flux coil, thereby increasing the strength of the connecting wire and preventing it from breaking after bending. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A three-dimensional diagram of a magnetic tripping mechanism provided in an embodiment of the present utility model;

[0017] Figure 2 An exploded view of the magnetic tripping mechanism provided in an embodiment of the present utility model;

[0018] Figure 3 This is one of the structural diagrams of the connecting wires in the magnetic tripping mechanism provided in an embodiment of the present utility model;

[0019] Figure 4 This is the second structural diagram of the connecting wire in the magnetic tripping mechanism provided by the embodiment of the present utility model;

[0020] Figure 5 A cross-sectional view of a magnetic flux coil in a magnetic tripping mechanism provided in an embodiment of the present utility model.

[0021] Icon: 100-magnetic core assembly; 200-flux coil; 300-terminal; 400-contact assembly; 500-connecting wire; 101-first wiring unit; 102-second wiring unit; 1011-support frame; 1021-winding column; 103-fixing slot; 501-lead wire; 502-protective wire; 600-copper sleeve; 700-insulating protective sleeve. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0025] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0026] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0027] In order to assist the circuit breaker in promptly disconnecting the circuit when a circuit fault occurs, a magnetic tripping mechanism is usually built into the circuit breaker. The mechanism includes: a magnetic core assembly 100 and a magnetic flux coil 200. The magnetic flux coil 200 is sleeved around the outer periphery of the magnetic core assembly 100. The two ends of the magnetic flux coil 200 are connected to the terminal block and the static contact, respectively. Due to the current characteristics, the diameter of the wire in the magnetic flux coil 200 is relatively small. For example, the wire diameter of the 1-2A wire is less than 0.5mm, and the wire diameter of the 3-4A wire is less than 0.75mm. This results in the wire connected to the external circuit being thinner. The wires at both ends of the magnetic flux coil 200 are easily broken due to bending, causing damage to the equipment. It can be understood that the portion of the magnetic flux coil 200 that is wound around the magnetic core assembly 100 is precisely and orderly arranged and will not bend. However, the portion that is connected to the external circuit needs to undergo processes such as welding and assembly, which inevitably require multiple bending processes. At this time, the thinner wire is very likely to break, causing equipment failure. In order to prevent the lead wire of the magnetic flux coil 200 from breaking, a copper sleeve 600 can be added to the lead wire of the magnetic flux coil 200 to increase the strength or to protect the lead wire by using a soft connection. However, the above method has a complicated processing procedure and high processing requirements. Since the lead wire is set in the copper sleeve 600, the copper sleeve 600 is easily crushed during processing, reducing the yield rate of the product. Since the copper sleeve 600 needs to be set outside the magnetic flux coil 200, there is still a relatively fragile connection point between the copper sleeve 600 and the magnetic flux coil 200, and the problem of wire breakage cannot be completely overcome. In addition, since there is a gap between the lead wire and the copper sleeve 600 after the lead wire is inserted into the copper sleeve 600, the lead wire is bent during material welding, transportation and installation. The lead wire and the edge of the copper sleeve 600 are subjected to cross-sectional shear force, which also increases the risk of lead wire breakage.

[0028] This embodiment provides a magnetic tripping mechanism, which includes: a magnetic core component 100 and a magnetic flux coil 200. The magnetic flux coil 200 is arranged on the outer periphery of the magnetic core component 100. The magnetic flux coil 200 is connected to the circuit via two connecting wires 500. The cross-sectional area of ​​at least one connecting wire 500 is larger than the cross-sectional area of ​​the wire in the magnetic flux coil 200.

[0029] Please refer to Figure 1 As shown, in some possible implementations, an enameled wire is wound around the outer periphery of the magnetic core assembly 100 to form a magnetic flux coil 200. The magnetic flux coil 200 cooperates with the magnetic core assembly 100 to form an electromagnet structure. When the current in the magnetic flux coil 200 exceeds a threshold value, a large magnetic field is generated, and the external moving contact assembly 400 separates from the static contact, disconnecting the circuit and thus protecting the circuit. In some possible implementations, a separate connecting wire 500 is provided to connect the magnetic flux coil 200 to the external circuit. By increasing the cross-sectional area of ​​the connecting wire 500, the strength of the connecting wire 500 is improved. During the subsequent welding and circuit breaker assembly process, the connecting wire 500 is stronger and less likely to break, thereby ensuring product quality.

[0030] Please refer to Figure 2 As shown, in some possible embodiments, the connecting cable 500 includes multiple strands of wire, each of which has one end connected to the flux coil 200 and the other end connected to an external circuit. Using multiple strands of wire increases the cross-sectional area of ​​the connecting cable 500, thereby improving its strength and preventing damage from repeated bending. Furthermore, the multiple strands of wire are independent of each other, so a single strand of wire breaking will not affect the normal power supply of the connecting cable 500, further improving the strength and service life of the connecting cable 500.

[0031] It should be noted that in some possible implementations, the conductors of the connecting line 500 can be configured as two, three, four, etc. strands as needed. Figure 1 and Figure 2 Only two wires are shown in the figure. The specific number of wires is not limited and can be adjusted according to strength requirements and costs during production.

[0032] It should be noted that in some possible embodiments, the single-strand conductor may be composed of a single wire, and an enameled wire of the same size and specification as the wire in the magnetic flux coil 200 may be used. Multiple wires form a connecting wire 500, so that the cross-sectional area of ​​the connection is larger than the cross-sectional area of ​​the wire in the magnetic flux coil 200, thereby improving the strength of the connecting wire 500.

[0033] Alternatively, in other embodiments, each conductor in the connecting cable 500 may be formed by combining multiple wires, with the multiple wires being arranged in parallel. This embodiment also ensures the strength of the connecting cable 500 by combining multiple wires. Even if some wires break, the use of the connecting cable 500 is not affected, thereby increasing the service life of the connecting cable 500.

[0034] It should be noted that the two strands of wire in this embodiment can be arranged in parallel in a parallel manner, or can be arranged in parallel in a spiral winding manner, so that the multiple strands of wire form a whole, which is convenient for connecting the multiple strands of wire with the magnetic flux coil 200 or the external circuit, and avoids the dispersion of the wires affecting the connection effect.

[0035] Alternatively, see Figure 2As shown, in some possible embodiments, the two ends of the magnetic flux coil 200 extend to form lead wires 501. During production, a cable can be used to wind the magnetic flux coil 200, and the two ends of the wire are reserved to form the lead wires 501. The lead wires 501 and the magnetic flux coil 200 are integrally formed and do not need to be connected separately, which reduces the processing steps during production and reduces the risk of the lead wires 501 and the magnetic flux coil 200 falling off or having poor contact. In order to ensure the strength of the lead wire 501 and prevent the lead wire 501 from breaking due to bending, at least one protective wire 502 is arranged in parallel along the length direction of the lead wire 501. The protective wire 502 is arranged in parallel with the lead wire 501 to form a connecting wire 500 connecting the magnetic flux coil 200 to the external circuit. Among them, one end of the protective wire 502 extends to the position of the magnetic flux coil 200, and the other end of the protective wire 502 is connected to the end of the lead wire 501 to form a wiring terminal, which is fixedly connected to the external circuit through the wiring terminal. This embodiment enhances the strength of the connecting wire 500 by adding a protective conductor 502. The wires of the magnetic flux coil 200 are directly led out and connected to the external circuit via a terminal block, ensuring a smooth circuit connection. The lead-out conductor 501 and the magnetic flux coil 200 are connected via flexible connectors or copper tube connections, eliminating the need for welding. This prevents poor contact between the connecting wire 500 and the magnetic flux coil 200. One end of the connecting wire 500 is welded to the external circuit, and multiple strands of wire are welded together and connected to the external circuit, ensuring a stable circuit connection.

[0036] It should be noted that in some possible implementations, both ends of the flux coil 200 are connected to an external circuit, thereby connecting the flux coil 200 to the external circuit for powering. Therefore, connecting wires 500 are provided at both ends of the flux coil 200, and the external circuit is connected via the connecting wires 500. The connecting wires 500 on both sides of the flux coil 200 are independent of each other, and the composition of the connecting wires 500 on both sides of the flux coil 200 can be adjusted separately as needed during production and manufacturing. For example, referring to Figure 2 As shown, one end of the flux coil 200 requires a longer connecting wire 500 to connect to the external circuit. However, longer connections are prone to bending and breaking. Therefore, a protective wire 502 is added where the lead wire 501 is drawn to increase the strength of the connecting wire 500. The greater the number of protective wires 502, the stronger the connecting wire 500. The number of protective wires 502 can be increased or decreased based on the required strength of the connecting wire 500. The other end of the flux coil 200 only requires a shorter connecting wire 500 to connect directly to the external circuit. This connection wire 500 is less likely to bend and break during assembly. In this case, the number of protective wires 502 can be reduced or eliminated altogether, reducing costs.

[0037] Please refer to Figure 3As shown, in some other embodiments, the connecting wires 500 on both sides of the magnetic flux coil 200 include protective wires 502, which improve the overall strength of the connecting wires 500. The protective wires 502 can be a single wire extending directly to both sides of the magnetic flux coil 200, thereby strengthening the lead wires 501 on both sides of the magnetic flux coil 200 and preventing the lead wires from breaking.

[0038] Optionally, in some possible embodiments, at least two conductors in the same section of the connecting wire 500 include a lead-out wire 501 and at least one protective wire 502, the magnetic flux coil 200 is connected to the circuit via the connection terminal of the connecting wire 500, and at least one protective wire 502 includes at least two sub-segments whose ends are connected in sequence, and the at least two sub-segments in the same protective wire 502 are arranged side by side.

[0039] Optionally, in some possible implementations, the protective wire 502 cooperates with the lead wire 501 to form the connecting wire 500, and the protective wire 502 is used to improve the strength of the connecting wire 500. It is understood that the strength of the connecting wire 500 can be improved by increasing the strength of the protective wire 502 (similar to increasing the diameter of the protective wire 502 under the material) or increasing the number of protective wires 502 in the same section of the connecting wire 500. Please refer to Figure 4 As shown, when the number of protective conductors 502 needs to be increased, a single strand of protective conductor 502 can be continuously bent to form a multi-segment structure. The bent protective conductor 502 is stronger, thereby increasing the bending and fracture resistance of the connecting cable 500. Forming a multi-strand protective structure by bending a single strand of protective conductor 502 prevents dispersion and entanglement, facilitating installation and arrangement of the protective conductors 502.

[0040] Optionally, in some possible embodiments, at least two conductors in the same section of connecting wire 500 include a connecting wire 500 and at least one protective wire 502, the flux coil 200 is connected to the circuit via the terminal end of the connecting wire 500, and the protective wire 502 is a non-wound wire.

[0041] Please refer to Figure 1 As shown, in some possible implementations, the protective wire 502 is connected only to the end of the flux coil 200 and, together with the lead wire 501, serves as a connecting wire 500 to the external circuit. The protective wire 502 is not wound around the magnetic core assembly 100. Except for the portion connected to the flux coil 200, the protective wire 502 is entirely away from the flux coil 200 to avoid affecting the magnetic field of the flux coil 200 during operation.

[0042] In some possible embodiments, the wire in the connecting wire 500 has a metal conductor portion inside and an insulating layer of a material such as rubber or plastic can be provided on the outside. The insulating layers are removed from both ends of the multi-strand wires and then connected together to form a whole connecting wire 500, and the two ends of the connecting wire 500 are respectively connected to the magnetic flux coil 200 and the external circuit, so that the magnetic flux coil 200 and the external circuit are conductive. Optionally, in some possible embodiments, the wire in the connecting wire 500 can be an enameled wire with the same size and structure as the wire in the magnetic flux coil 200. By coating the outer peripheral wall of the metal conductor with insulating varnish to form an insulating layer, it not only has an insulating effect, but also reduces costs and reduces the thickness of the insulating layer, facilitating production.

[0043] Please refer to Figure 1 and Figure 2 As shown, in some possible embodiments, the outer cover of the magnetic flux coil 200 is provided with an insulating protective cover 700. On the one hand, the insulating protective cover 700 can protect the internal magnetic flux coil 200 and improve the stability of the magnetic flux coil 200, preventing damage to the magnetic flux coil 200 or shaking of the hard line affecting the stability of the magnetic field. On the other hand, the insulating protective cover 700 can form an insulating interlayer to isolate the magnetic flux coil 200 from the outside, preventing the external circuit from contacting the magnetic flux coil 200 and affecting the magnetic field of the magnetic flux coil 200. In some possible embodiments, the magnetic flux coil 200 is wrapped inside the insulating protective cover 700, and the two ends of the magnetic flux coil 200 are led out through the connecting wire 500 and connected to the external circuit. The connection point between the magnetic flux coil 200 and the connecting wire 500 is located inside the insulating protective cover 700, and the connection point between the magnetic flux coil 200 and the connecting wire 500 is set at the edge of the insulating protective cover 700. The insulating protective cover 700 can ensure the stability of the connection point, prevent the connection line 500 from being separated from the magnetic flux coil 200, and at the same time set the connection point at the edge of the insulating protective cover 700 to prevent the connection line 500 from affecting the magnetic field effect of the magnetic flux coil 200.

[0044] It should be noted that in some possible implementations, the insulating protective cover 700 is formed by winding multiple layers of insulating skin to form a multi-layer structure, and the end of the protective wire 502 close to the magnetic flux coil 200 is separated from the magnetic flux coil 200 and the lead wire 501 by at least one layer of insulating protective cover 700, so that the protective wire 502 and the magnetic flux coil 200 are insulated from each other. Figure 5 As shown, the outer layer of the flux coil 200 can be provided with a first insulating protective sheath 700, and the protective conductor 502 is disposed outside the first insulating protective sheath 700. The first insulating protective sheath 700 isolates the protective conductor 502 from the flux coil 200, providing insulation. To ensure safety, a second insulating protective sheath 700 is also provided outside the protective conductor 502. This not only secures the protective conductor 502 but also prevents it from being exposed to the external environment, ensuring its safety and stability.

[0045] In some possible implementations, the strength of the connecting wire 500 is improved by increasing the cross-sectional area of ​​the connecting wire 500 to prevent the connecting wire 500 from breaking or being damaged due to bending. Specifically, the cross-sectional area of ​​the connecting wire 500 is greater than 1 mm 2 It can meet the use strength and will not break after multiple bends. It should be noted that the magnetic trip mechanism provided in this embodiment is encapsulated inside the circuit breaker after assembly, so the connecting wire 500 will no longer bend after encapsulation. The reason why the connecting wire 500 bends is that the connecting wire 500 needs to be adjusted when assembling the magnetic trip mechanism, and the number of bends is limited, so the cross-sectional area of ​​the connecting wire 500 is greater than 1mm 2 In some possible implementations, when the connecting wire 500 is arranged in parallel with multiple strands of wire, it is only necessary to meet the requirement that the cross-sectional area of ​​a single strand of wire multiplied by the number of wires is greater than 1 mm. 2 That's it.

[0046] Optionally, in some possible implementations, the two ends of the multiple strands of wire in the connecting wire 500 can be connected by soldering, resistance welding, etc., and the two ends of the connecting wire 500 can also be connected to an external circuit by soldering, resistance welding, etc. to form a current path. The operation is convenient, and the welding quality can be judged by observing the welding joint to avoid poor contact and other situations, thereby improving product quality.

[0047] Optionally, in some possible embodiments, the magnetic core assembly 100 includes a first wiring unit 101 and a second wiring unit 102, the first wiring unit 101 is provided with a support frame 1011, the second wiring unit 102 is provided on the support frame 1011, the second wiring unit 102 is provided with a winding post 1021, and the magnetic flux coil 200 is wound on the winding post 1021.

[0048] Please refer to Figure 1 and Figure 2As shown, in some possible embodiments, the magnetic core assembly 100 includes a first wiring unit 101 and a second wiring unit 102, and the first wiring unit 101 and the second wiring unit 102 are detachably connected to facilitate production and assembly. The first wiring unit 101 can be made of metal to ensure the strength of the support frame 1011 while also playing a protective role, protecting the second wiring unit 102 and the flux coil 200. The first wiring unit 101 can be made of metal to facilitate connection to external circuits, such as static contacts or terminal blocks, to ensure the stability of the static contacts or terminal blocks. The second wiring unit 102 is insulated from the first wiring unit 101. The second wiring unit 102 is wound around the flux coil 200. An iron core assembly can be set in the winding column 1021 to form an electromagnet structure with the flux coil 200, thereby triggering the moving contact assembly 400 when the current is too large, separating the moving contact assembly 400 from the static contact and disconnecting the circuit, thereby achieving a protective effect.

[0049] Optionally, in some possible embodiments, a fixing slot 103 is formed on the first wiring unit 101 or the second wiring unit 102, and the connecting wire 500 can be clamped in the fixing slot 103. The fixing slot 103 plays a fixing role, preventing the connecting wire 500 from shaking and preventing the connecting wire 500 from being separated from the magnetic flux coil 200.

[0050] This embodiment provides a circuit breaker, which includes a contact assembly 400, a terminal 300 and the magnetic tripping mechanism provided in the above embodiment. The magnetic flux coil 200 of the magnetic tripping mechanism is electrically connected to the contact assembly 400 and the terminal 300 via two connecting wires 500.

[0051] In some possible embodiments, the magnetic tripping mechanism is connected to the contact assembly 400 and the terminal block 300 through a separately provided connecting wire 500 to form a current path. By increasing the cross-sectional area of ​​the connecting wire 500, the strength of the connecting wire 500 is improved, ensuring that the connecting wire 500 will not break due to bending during the assembly of the circuit breaker, thereby ensuring the product quality and yield of the circuit breaker.

[0052] In summary, the present invention provides a magnetic tripping mechanism comprising: a magnetic core assembly 100 and a magnetic flux coil 200. The magnetic flux coil 200 is sleeved around the outer periphery of the magnetic core assembly 100. The magnetic flux coil 200 is connected to the circuit via two connecting wires 500, at least one of which has a cross-sectional area greater than the cross-sectional area of ​​the wires in the magnetic flux coil 200. The present invention connects the magnetic flux coil 200 to a terminal block or a static contact by providing a separate connecting wire 500, facilitating replacement and maintenance. The cross-sectional area of ​​the connecting wire 500 is greater than the cross-sectional area of ​​the wires in the magnetic flux coil 200, thereby increasing the strength of the connecting wire 500 and preventing it from breaking after bending.

[0053] The present invention also provides a circuit breaker comprising a contact assembly 400, a terminal block 300, and the aforementioned magnetic trip mechanism. The magnetic flux coil 200 of the magnetic trip mechanism is electrically connected to the contact assembly 400 and the terminal block 300, respectively, via two connecting wires 500. The magnetic trip mechanism connects the contact assembly 400 and the terminal block 300 via the separately provided connecting wire 500 to form a current path. Increasing the cross-sectional area of ​​the connecting wire 500 improves its strength, ensuring that the connecting wire 500 will not break due to bending during assembly, thereby improving the product quality and yield rate of the circuit breaker.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A magnetic tripping mechanism, characterized in that: include: A magnetic core component (100) and a magnetic flux coil (200), wherein the magnetic flux coil (200) is sleeved on the outer periphery of the magnetic core component (100), and the magnetic flux coil (200) is connected to a circuit via two sections of connecting wires (500), and the cross-sectional area of ​​at least one section of the connecting wire (500) is larger than the cross-sectional area of ​​the wire in the magnetic flux coil (200).

2. The magnetic tripping mechanism according to claim 1, characterized in that: At least one section of the connecting line (500) comprises at least two conductors, and the at least two conductors are parallel.

3. The magnetic tripping mechanism according to claim 2, characterized in that: At least two conductors in the same section of the connecting wire (500) include a lead-out wire (501) and at least one protective wire (502); the magnetic flux coil (200) is connected to the circuit via a terminal of the connecting wire (500); and at least one end of the protective wire (502) is connected to the terminal of the connecting wire (500).

4. The magnetic tripping mechanism according to claim 2, characterized in that: At least two conductors in the same section of the connecting wire (500) include a lead-out wire (501) and at least one protective wire (502); the magnetic flux coil (200) is connected to the circuit via a terminal of the connecting wire (500); at least one protective wire (502) includes at least two sub-segments whose ends are connected in sequence, and the at least two sub-segments in the same protective wire (502) are arranged side by side.

5. The magnetic tripping mechanism according to claim 2, characterized in that: At least two conductors in the same section of the connecting wire (500) include a lead-out wire (501) and at least one protective wire (502); the magnetic flux coil (200) is connected to the circuit via a terminal end of the connecting wire (500); and the protective wire (502) is a non-wound wire.

6. The magnetic tripping mechanism according to claim 2, characterized in that: In at least two strands of the connecting wire (500) in the same section, each strand comprises a conductor portion and an insulating layer.

7. The magnetic tripping mechanism according to any one of claims 3 to 5, characterized in that: An insulating protective sleeve (700) is provided on the outer periphery of the magnetic flux coil (200), and the insulating protective sleeve (700) is located between the protective conductor (502) and the magnetic flux coil (200).

8. The magnetic tripping mechanism according to any one of claims 1 to 6, characterized in that: The cross-sectional area of ​​at least one section of the connecting line (500) is greater than 1 mm 2 .

9. The magnetic tripping mechanism according to any one of claims 1 to 6, characterized in that: The magnetic core assembly (100) comprises a first wiring unit (101) and a second wiring unit (102); the first wiring unit (101) is provided with a support frame (1011); the second wiring unit (102) is provided with a winding post (1021); and the magnetic flux coil (200) is wound on the winding post (1021).

10. A circuit breaker, characterized in that: The invention comprises a contact assembly (400), a terminal (300) and a magnetic tripping mechanism according to any one of claims 1 to 9, wherein the magnetic flux coil (200) of the magnetic tripping mechanism is electrically connected to the contact assembly (400) and the terminal (300) via two connecting wires (500).

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