Thermal protection mechanism and circuit breaker

Abstract

The utility model belongs to the technical field of circuit breakers, and discloses a thermal protection mechanism and a circuit breaker, the thermal protection mechanism comprises conductive connecting pieces, thermal tripping pieces and a zero line conductive piece, the second end of one of the plurality of conductive connecting pieces is fixedly provided with the zero line conductive piece, and the second ends of the other conductive connecting pieces are respectively connected with the thermal tripping pieces. At least one conductive connecting piece is provided with a through hole, and the through hole penetrates from the first end to the second end of the conductive connecting piece; the circuit breaker comprises a shell and the thermal protection mechanism, an operating mechanism is arranged in the shell, and the thermal tripping piece is used for driving the operating mechanism to act. The thermal protection mechanism provided by the utility model is simple in structure, effectively improves the heat dissipation capability, and can effectively guarantee the heat dissipation balance in the power-on process of the circuit breaker when being used in the circuit breaker.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a thermal protection mechanism and a circuit breaker. Background Art

[0002] Molded case circuit breakers are widely used in industries such as industry and agriculture, transportation, mining, construction, and national defense. They have multiple protection functions such as overload, short circuit, and undervoltage protection, adjustable action values, high breaking capacity, and are convenient and safe. They are very widely used products in low-voltage electrical appliances.

[0003] At present, molded case circuit breakers generally have a thermal protection mechanism, which is used to play a timely and effective protection role in case of overheating failure during continuous power-on of the circuit breaker. The thermal protection mechanism in the working state itself will also generate heat, and the heat will be conducted to the incoming and outgoing neutral conductor components. If the heat dissipation balance cannot be maintained during continuous power-on, it will cause the wiring board to be heated beyond the thermal tolerance limit, resulting in electrical performance loss and having an adverse impact on the entire power system. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a thermal protection mechanism with a simple structure, which can effectively improve the heat dissipation capacity and can effectively ensure the heat dissipation balance during the power-on process of the circuit breaker when used in the circuit breaker.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A thermal protection mechanism includes a neutral conductor component, a plurality of conductive connectors, and a plurality of thermal release fasteners;

[0007] The first ends of the plurality of conductive connectors are respectively fixed with first conductive contacts, the second end of one of the plurality of conductive connectors is fixed with the neutral conductor component, and the second ends of the remaining conductive connectors are respectively connected to the thermal release fasteners;

[0008] At least one of the conductive connectors is provided with a through hole, and the through hole penetrates from the first end to the second end of the conductive connector.

[0009] Preferably, the first end of the conductive connector is provided with a first joint, the first joint has a first fixing portion arranged in a plate shape, the first fixing portion is in fit connection with the first conductive contact, and the through hole penetrates the first joint;

[0010] The second end of the conductive connector is fixedly provided with a second joint, the second joint has a second fixing portion arranged in a plate shape, the second fixing portion is in fit connection with the thermal release fastener or the neutral conductor component, and the through hole penetrates the second joint.

[0011] Preferably, the first joint is provided with a first transition surface, and the first joint is smoothly and transitionally connected to the conductive connecting member through the first transition surface, and the through hole penetrates through the first transition surface;

[0012] The second joint is provided with a second transition surface, and the second joint is smoothly and transitionally connected to the conductive connecting member through the second transition surface, and the through hole penetrates through the second transition surface.

[0013] Preferably, the second fixing portion has a fitting end surface for contacting the thermal release fastener or the neutral conductor, and the fitting end surface is provided with patterns.

[0014] Preferably, the second fixing portion is provided with a mounting hole for fixedly connecting to the thermal release fastener or the neutral conductor.

[0015] Preferably, the conductive connecting member includes a conductive portion and an insulating portion, the insulating portion is coated on the outside of the conductive portion, the first end of the conductive portion is connected to the first conductive contact, the second end of the conductive portion is used to connect to the thermal release fastener or the neutral conductor, at least one of the conductive portions of the conductive connecting members is provided with the through hole, and the through hole penetrates from the first end to the second end of the conductive portion.

[0016] Preferably, the neutral conductor includes a conductive connection plate and a second conductive contact, the first end of the conductive connection plate is fixedly connected to the second end of the conductive connecting member, and the second end of the conductive connection plate is fixedly connected to the second conductive contact.

[0017] Preferably, it further includes an instrument transformer, and a plurality of the conductive connecting members all pass through the instrument transformer.

[0018] Preferably, a contact piece is arranged on the first conductive contact, and the contact piece is provided with a connection hole for welding to the circuit board wire.

[0019] Preferably, a plug connector is arranged on the first conductive contact, the contact piece is correspondingly provided with a fixing hole, and the plug connector is fixedly inserted into the fixing hole.

[0020] A circuit breaker, comprising:

[0021] A housing, an operating mechanism is arranged inside the housing; and

[0022] The thermal protection mechanism as described in any one of the above, arranged inside the housing, and the thermal release fastener is used to drive the operating mechanism to act.

[0023] Beneficial effects:

[0024] The thermal protection mechanism provided by the present utility model has a neutral conductor electrical component fixed to the second end of one of the multiple conductive connectors. The conductive connector can jointly form a normally closed neutral circuit with the neutral conductor electrical component and the corresponding first conductive contact. Among the remaining multiple conductive connectors, each conductive connector corresponds to a phase current in the AC circuit, and a thermal release component is fixed to the second end of each. Inside the circuit breaker, an operating mechanism is provided in the housing. The thermal release component is adapted to drive the operating mechanism to act when the inside of the housing overheats, thereby tripping the operating mechanism and achieving overheat protection of the circuit breaker. At least one conductive connector is provided with a through hole that penetrates from the first end to the second end of the conductive connector. When the internally flowing gas expands upon heating, it can quickly discharge outward to form convection, enhancing the heat dissipation function. This effectively ensures that the circuit breaker maintains heat dissipation balance during power-on, avoids overheating inside the circuit breaker, and ensures reliable electrical performance of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the thermal protection mechanism provided by the present utility model;

[0026] Figure 2 is a schematic structural diagram of the conductive connector from a perspective of the present utility model;

[0027] Figure 3 is at Figure 2 in the present utility model, a partial enlarged schematic diagram at A;

[0028] Figure 4 is a schematic structural diagram of the conductive connector from another perspective of the present utility model;

[0029] Figure 5 is an exploded schematic diagram of the first conductive contact and the contact piece provided by the present utility model.

[0030] In the figure:

[0031] 1. Conductive connector; 11. Conductive part; 1101. Through hole; 111. First joint; 1111. First fixing part; 1112. First transition surface; 112. Second joint; 1121. Second fixing part; 1122. Second transition surface; 1123. Fitting end face; 1124. Mounting hole; 12. Insulating part;

[0032] 2. Thermal release component; 21. Bimetallic strip;

[0033] 3. Neutral conductor electrical component; 31. Conductive connection plate; 32. Second conductive contact;

[0034] 4. First conductive contact; 41. Contact piece; 411. Connection hole; 412. Fixing hole; 42. Plug connector;

[0035] 5. Current transformer;

[0036] 61. First screw; 62. Second screw. Detailed implementation mode

[0037] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only parts related to the present utility model are shown in the drawings, rather than all structures.

[0038] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0039] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0040] In the description of this embodiment, the orientation or positional relationship terms such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0041] This embodiment provides a circuit breaker, which includes a housing and also includes a thermal protection mechanism. Refer to Figures 1 to 5As shown, the thermal protection mechanism is disposed within a housing (not shown), and includes a neutral conductor 3, a plurality of conductive connectors 1, and a plurality of thermal release members 2. First conductive contacts 4 are respectively fixed to the first ends of the plurality of conductive connectors 1. The neutral conductor 3 is fixed to the second end of one of the plurality of conductive connectors 1, and the second ends of the remaining conductive connectors 1 are respectively connected to the thermal release members 2. At least one of the conductive connectors 1 is provided with a through hole 1101 that penetrates from the first end to the second end of the conductive connector 1.

[0042] In this embodiment, the neutral conductor 3 is fixed to the second end of one of the plurality of conductive connectors 1, and this conductive connector 1 can jointly form a normally closed neutral circuit with the neutral conductor 3 and the corresponding first conductive contact 4. Among the remaining plurality of conductive connectors 1, each conductive connector 1 corresponds to one phase current in the AC circuit, and a thermal release member 2 is fixed to the second end. Inside the circuit breaker, an operating mechanism is provided within its housing, and the thermal release member 2 is used to drive the operating mechanism to act.

[0043] The thermal protection mechanism is a protection mechanism within the circuit breaker. Specifically, for a circuit breaker through which three-phase alternating current is passed, when the circuit breaker is externally connected to an external electrical appliance, the external electrical appliance is electrically connected to the three-phase alternating current through the circuit breaker, and the three-phase alternating current correspondingly flows through the three conductive connectors 1. When a certain phase of the three-phase alternating current overheats, the thermal release member 2 corresponding to this phase of alternating current performs a tripping action, so that the three conductive connectors 1 are disconnected from electrical conduction, thereby realizing the overheat protection function. The setting of the through hole 1101 can, to a certain extent, reduce the accumulation of heat, reduce the generation of tripping actions to a certain extent, and ensure that the circuit is in a reliable conduction state.

[0044] Specifically, at least one of the conductive connectors 1 is provided with a through hole 1101 that penetrates the conductive connector 1, and when the gas flowing inside expands due to heat, it can quickly discharge outward to form a convection, enhancing the heat dissipation function. This effectively ensures that the circuit breaker maintains heat dissipation balance during power-on, avoids overheating inside the circuit breaker, and ensures the reliable electrical performance of the circuit breaker.

[0045] Exemplarily, since the induced current at the axis of the conductive connector 1 is the largest and smaller at the surface, the current density is larger at the surface. The conductive connector 1 provided with a hollow through hole 1101 can effectively increase its own surface area, further improve the conductivity, reduce losses, and save materials to reduce costs.

[0046] Exemplarily, the conductive connector 1 can be set as a hollow tubular shape, and the internal hollow structure forms the through hole 1101. The shape of the axial cross-section of the tubular conductive connector 1 can be circular, rectangular, or other polygonal shapes.

[0047] Exemplarily, the conductive connecting member 1 can be arranged as a hollow plate shape, and the internal hollow structure forms a through hole 1101.

[0048] Exemplarily, the conductive connecting member 1 includes a conductive part 11 and an insulating part 12. The insulating part 12 is coated on the outer side of the conductive part 11. The first end of the conductive part 11 is connected to the first conductive contact 4, and the second end of the conductive part 11 is used to be connected to the thermal release fastener 2 or the neutral conductor conductive member 3. The through hole 1101 is provided in the conductive part 11 of at least one conductive connecting member 1, and the through hole 1101 penetrates from the first end to the second end of the conductive part 11. Specifically, the insulating part 12 coated on the outside of the conductive part 11 plays a role of reliable insulation. The first end of the conductive part 11 is connected to the first conductive contact 4, and the second end can be selectively connected to the thermal release fastener 2 or the neutral conductor conductive member 3.

[0049] Exemplarily, the material of the conductive part 11 can be copper or other materials with good electrical conductivity, and no more limitations are made here.

[0050] Exemplarily, the material of the insulating part 12 can be rubber or other materials with good insulation performance, and no more limitations are made here.

[0051] Exemplarily, the circuit breaker of this embodiment applies three-phase alternating current, that is, the number of conductive connecting members 1 is four, and the number of thermal release fasteners 2 is three. The neutral conductor conductive member 3 is fixed to the second end of one of the conductive connecting members 1, and the remaining three conductive connecting members 1 respectively correspond to three-phase alternating current, and the second ends of the remaining three conductive connecting members 1 are each fixed with a thermal release fastener 2. When a certain phase of the three-phase alternating current corresponding to the conductive connecting member 1 overheats, the corresponding thermal release fastener 2 drives the operating mechanism to trip, realizing the overheat protection of the circuit breaker.

[0052] Exemplarily, a plurality of single-phase electrical conduction members (not shown) are provided in the circuit breaker, and a traction rod (not shown) is further included. The plurality of single-phase electrical conduction members are connected and electrically conducted with the conductive connecting members 1 corresponding to the plurality of connecting thermal release fasteners 2.

[0053] Specifically, multiple unidirectional electrical conduction components correspond to the polyphase alternating current passing through the circuit breaker. Exemplarily, for three-phase alternating current, three unidirectional electrical conduction components are provided inside the circuit breaker, and the number of thermal release fasteners 2 is also set to three. The three unidirectional electrical conduction components are connected and electrically conducted with the conductive connection components 1 corresponding to the three thermal release fasteners 2. A bimetal sheet 21 is provided on the thermal release fastener 2, and the three bimetal sheets 21 are all arranged corresponding to the traction rod. In the normal conduction state, the bimetal sheet 21 contacts the single-phase electrical conduction component, and the end of the single-phase electrical conduction component away from the conductive connection component 1 contacts and is electrically conducted with a third conductive contact (not shown) provided on the circuit breaker. For three-phase alternating current, three unidirectional electrical conduction components are correspondingly provided, and three third conductive contacts are correspondingly provided. The three third conductive contacts are all arranged corresponding to the traction rod. The first conductive contact 4, the conductive connection component 1, the single-phase electrical conduction component, and the third conductive contact can form a conductive path. For three-phase alternating current, three such conductive paths are provided. When the circuit breaker is connected to an external electrical appliance, the external electrical appliance is respectively electrically connected to the first conductive contact 4 and the third conductive contact, and thus a closed loop can be formed for the external electrical appliance. When a certain phase overheats, the bimetal sheet 21 of the thermal release fastener 2 corresponding to the alternating current of this phase is deformed by heat, pushing the traction rod to act, so that the traction rod drives all three third conductive contacts to separate, cutting off the electrical conduction between the three guiding electrical conduction components and the third conductive contact, that is, realizing the tripping action.

[0054] The specific structure and working principle of the thermal release fastener 2 are prior art and not the focus of this application, so no more details will be described here.

[0055] Specifically, a first joint 111 is provided at the first end of the conductive connection component 1. The first joint 111 has a first fixing part 1111 arranged in a plate shape. The first fixing part 1111 is attached and connected to the first conductive contact 4, and a through hole 1101 penetrates through the first joint 111. Specifically, the first joint 111 is fixedly arranged at the first end of the conductive part 11. Specifically, the first fixing part 1111 is set in a plate shape to increase the effective contact area with the first conductive contact 4, further reduce the resistance, and enhance the electrical conductivity between the conductive part 11 and the first conductive contact 4. A second joint 112 is fixedly provided at the second end of the conductive connection component 1. The second joint 112 has a second fixing part 1121 arranged in a plate shape. The second fixing part 1121 is attached and connected to the thermal release fastener 2 or the neutral wire conductive component 3, and a through hole 1101 penetrates through the second joint 112. Specifically, the second joint 112 is fixedly arranged at the second end of the conductive part 11. Specifically, the second fixing part 1121 is set in a plate shape to increase the effective contact area with the thermal release fastener 2 or the neutral wire conductive component 3, further reduce the resistance, and enhance the electrical conductivity between the conductive part 11 and the thermal release fastener 2 or the neutral wire conductive component 3.

[0056] Exemplarily, the first conductive contact 4 is used to connect with a conductive element (not shown) inside the circuit breaker and conduct electricity. Exemplarily, the first conductive contact 4 is fixed to the conductive element inside the circuit breaker by welding.

[0057] Furthermore, the first joint 111 is provided with a first transition surface 1112. The first joint 111 is smoothly and transitionally connected to the conductive connecting member 1 through the first transition surface 1112, and the through hole 1101 penetrates through the first transition surface 1112; the second joint 112 is provided with a second transition surface 1122. The second joint 112 is smoothly and transitionally connected to the conductive connecting member 1 through the second transition surface 1122, and the through hole 1101 penetrates through the second transition surface 1122. Specifically, the first joint 111 is smoothly and transitionally connected to the conductive part 11 through the first transition surface 1112, and the second joint 112 is smoothly and transitionally connected to the conductive part 11 through the second transition surface 1122. The first end of the through hole 1101 penetrates through to the first transition surface 1112, and the second end of the through hole 1101 penetrates through to the second transition surface 1122. Specifically, the settings of the first transition surface 1112 and the second transition surface 1122 can reduce the sharp parts between the first joint 111, the second joint 112 and the conductive part 11, effectively avoiding the breakdown phenomenon caused by the large curvature of the sharp parts and the accumulation of charges due to the dense power lines.

[0058] Exemplarily, the second fixing part 1121 has a fitting end surface 1123 for contacting with the thermal release buckle 2 or the neutral conductor 3. Patterns (not shown) are provided on the fitting end surface 1123. Specifically, by applying the surface embossing process, patterns are processed on the fitting end surface 1123 to further increase the surface area of the fitting end surface 1123, and more air can also be contacted, further improving the electrical conductivity. When the fitting end surface 1123 is in contact and fit with the thermal release buckle 2 or the neutral conductor 3, the surface patterns can generate groove structures, and the heat dissipation performance of the contact area can also be further improved.

[0059] Exemplarily, the conductive part 11, the first joint 111 and the second joint 112 are integrally formed.

[0060] In this embodiment, an installation hole 1124 for fixedly connecting with the thermal release buckle 2 or the neutral conductor 3 is formed on the second fixing part 1121. Exemplarily, the second fixing part 1121 and the thermal release buckle 2 are fixedly connected by a first screw 61. A first screw hole (not shown) is provided on the thermal release buckle 2, and the first screw 61 passes through the installation hole 1124 and is threadedly connected to the first screw hole. Exemplarily, the second fixing part 1121 and the neutral conductor 3 are fixedly connected by a second screw 62. A second screw hole (not shown) is provided on the neutral conductor 3, and the second screw 62 passes through the installation hole 1124 and is threadedly connected to the second screw hole.

[0061] In this embodiment, the neutral conductor 3 includes a conductive connection plate 31 and a second conductive contact 32. The first end of the conductive connection plate 31 is fixedly connected to the second end of the conductive connection member 1, and the second end of the conductive connection plate 31 is fixedly connected to the second conductive contact 32. Specifically, the first end of the conductive connection plate 31 is fixedly connected to the second end of the conductive part 11. Specifically, the second screw hole is opened at the first end of the conductive connection plate 31, and the fixed connection between the conductive connection plate 31 and the second fixing part 1121 is realized through the second screw hole.

[0062] In this embodiment, the thermal protection mechanism further includes a current transformer 5, and a plurality of conductive connection members 1 all pass through the current transformer 5. Specifically, when an electric shock or leakage fault occurs in the circuit, the current transformer 5 outputs a zero-sequence current on the secondary side, causing the equipment protection actions (cutting off the power supply, alarming, etc.) on the connected secondary circuit. Applying the zero-sequence current protection principle, a plurality of conductive connection members 1 are made to pass through the current transformer 5 together to detect the vector sum of the currents of the plurality of conductive connection members 1, that is, the zero-sequence current. When the polyphase load is completely balanced, the zero-sequence current is zero. When the polyphase load is unbalanced, the zero-sequence current is not zero, that is, the three-phase unbalanced current. When a ground fault occurs in a certain phase, a single-phase ground fault current will inevitably be generated. At this time, the detected zero-sequence current is the vector sum of the three-phase unbalanced current and the single-phase ground fault current.

[0063] In this embodiment, a contact piece 41 is provided on the first conductive contact 4, and the contact piece 41 is provided with a connection hole 411 for welding to the circuit board wire. Specifically, the connection hole 411 on the contact piece 41 is used for welding the circuit board wire, and thus for taking power when performing the product leakage performance test.

[0064] Exemplarily, a plug connector 42 is provided on the first conductive contact 4, and the contact piece 41 is correspondingly provided with a fixing hole 412, and the plug connector 42 is fixedly inserted into the fixing hole 412. The contact piece 41 is fixedly sleeved on the plug connector 42 through the fixing hole 412. With such a setting, the structure is simple and the installation is convenient.

[0065] Exemplarily, the fixing hole 412 is set as a waist-shaped long hole, and the plug connector 42 is correspondingly set as a waist-shaped structure. With such a setting, it can effectively prevent the contact piece 41 from rotating randomly relative to the first conductive contact 4 and ensure reliable and stable insertion.

[0066] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A thermal protection mechanism, characterized in that, It includes a neutral conductor (3), a plurality of conductive connectors (1), and a plurality of thermal release fasteners (2); First conductive contacts (4) are respectively fixed to the first ends of the plurality of conductive connectors (1). The neutral conductor (3) is fixed to the second end of one of the plurality of conductive connectors (1), and the second ends of the remaining conductive connectors (1) are respectively connected to the thermal release fasteners (2); At least one of the conductive connectors (1) is provided with a through hole (1101) that penetrates from the first end to the second end of the conductive connector (1).

2. The thermal protection mechanism according to claim 1, characterized in that, A first joint (111) is provided at the first end of the conductive connector (1). The first joint (111) has a first fixing portion (1111) arranged in a plate shape. The first fixing portion (1111) is in fit connection with the first conductive contact (4), and the through hole (1101) penetrates the first joint (111); A second joint (112) is fixedly provided at the second end of the conductive connector (1). The second joint (112) has a second fixing portion (1121) arranged in a plate shape. The second fixing portion (1121) is in fit connection with the thermal release fastener (2) or the neutral conductor (3), and the through hole (1101) penetrates the second joint (112).

3. The thermal protection mechanism according to claim 2, characterized in that, The first joint (111) is provided with a first transition surface (1112). The first joint (111) is smoothly transitionally connected to the conductive connector (1) through the first transition surface (1112), and the through hole (1101) penetrates the first transition surface (1112); The second joint (112) is provided with a second transition surface (1122). The second joint (112) is smoothly transitionally connected to the conductive connector (1) through the second transition surface (1122), and the through hole (1101) penetrates the second transition surface (1122).

4. The thermal protection mechanism according to claim 2, characterized in that, The second fixing portion (1121) has a fitting end surface (1123) for contacting the thermal release fastener (2) or the neutral conductor (3), and patterns are provided on the fitting end surface (1123).

5. The thermal protection mechanism according to claim 2, characterized in that, Mounting holes (1124) for fixedly connecting to the thermal release fastener (2) or the neutral conductor (3) are provided on the second fixing portion (1121).

6. The thermal protection mechanism according to claim 1, characterized in that The conductive connector (1) includes a conductive portion (11) and an insulating portion (12). The insulating portion (12) is coated on the outside of the conductive portion (11). The first end of the conductive portion (11) is connected to the first conductive contact (4), and the second end of the conductive portion (11) is used for connecting to the thermal release fastener (2) or the neutral conductor (3). The conductive portion (11) of at least one of the conductive connectors (1) is provided with the through hole (1101), and the through hole (1101) penetrates from the first end to the second end of the conductive portion (11).

7. The thermal protection mechanism according to claim 1, characterized in that, The neutral conductor (3) includes a conductive connection plate (31) and a second conductive contact (32). The first end of the conductive connection plate (31) is fixedly connected to the second end of the conductive connection member (1), and the second end of the conductive connection plate (31) is fixedly connected to the second conductive contact (32).

8. The thermal protection mechanism according to claim 1, wherein It further includes an instrument transformer (5), and a plurality of the conductive connection members (1) all pass through the instrument transformer (5).

9. The thermal protection mechanism according to claim 1, characterized in that, A contact piece (41) is arranged on the first conductive contact (4), and the contact piece (41) is provided with a connection hole (411) for welding with the circuit board wire.

10. The thermal protection mechanism according to claim 9, characterized in that, A plug connector (42) is arranged on the first conductive contact (4), and a fixing hole (412) is correspondingly arranged on the contact piece (41), and the plug connector (42) is fixedly inserted into the fixing hole (412).

11. A circuit breaker, characterized in that, Comprising: a housing, an operating mechanism is arranged inside the housing; and a thermal protection mechanism as described in any one of claims 1-10, which is arranged inside the housing, and the thermal release fastener (2) is used to drive the operating mechanism to actuate.

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