Thermomagnetic tripping system and circuit breaker

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses a thermomagnetic tripping system and a circuit breaker. The thermomagnetic tripping system comprises a thermal element, an armature and an iron core, the armature is rotationally connected to one side of the thermal element, a reset piece is arranged between the thermal element and the armature, and the reset piece is used for enabling the armature to rotate to abut against the thermal element so that the armature can be stopped at the first station. The iron core is arranged on the other side of the thermal element, and a magnetic field generated by the iron core can attract the armature to rotate, so that the armature abuts against the iron core, and the armature is stopped at the second station. The armature and the iron core are directly arranged on the thermal element, on one hand, the armature and the iron core are supported and limited by the thermal element, and no extra support needs to be arranged. And on the other hand, magnetism between the iron core and the armature is isolated through the thermal element, magnetism can be effectively isolated, magnetic loss is reduced, and therefore the magnetic force is improved.

Description

Technical Field

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

[0002] Circuit breakers are widely used in industry, agriculture, transportation, mining, civil construction and national defense. They play a great role in the transmission and distribution of electricity and the protection of motors. They are the most widely used products in low-voltage electrical appliances. Circuit breakers are switching devices that can carry and break current under normal circuit conditions, and can carry and break current under abnormal circuit conditions within a specified time.

[0003] The thermal magnetic tripping system is an important mechanism of the circuit breaker. In the existing thermal magnetic tripping system, a bracket is used between the iron core and the armature to separate the iron core and the armature, and the bracket is used to limit the armature. The three parts of the bracket, armature and iron core need to be riveted. The riveting process has large deviations (there are problems such as the opening gap of the magnetic system riveting and excessive riveting deformation), which causes the magnetic gap to be unstable, thereby causing the magnetic action to be unstable.

[0004] Therefore, there is an urgent need to improve the thermal magnetic tripping system and circuit breaker to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a thermal magnetic tripping system and a circuit breaker, which do not require an additional bracket to isolate the iron core and the armature from the magnetism, thereby reducing magnetic loss and improving magnetic force; reducing riveting, thereby reducing the instability of the magnetic gap caused by the riveting process deviation and improving the stability of the magnetic action.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Thermal-magnetic trip system, including:

[0008] Thermal elements;

[0009] An armature is rotatably connected to one side of the thermal element, a reset member is provided between the thermal element and the armature, and the reset member is used to rotate the armature until it abuts against the thermal element, so that the armature stops at the first position;

[0010] The iron core is arranged on the other side of the thermal element. The magnetic field generated by the iron core can attract the armature to rotate, so that the armature abuts against the iron core, so that the armature stops at the second working position.

[0011] As an optional solution, the thermal-magnetic tripping system further includes:

[0012] A bimetallic strip, one end of which is connected to the thermal element, and the other end of which is provided with an adjusting screw, wherein the tip of the adjusting screw protrudes from the inwardly bent side of the bimetallic strip.

[0013] As an optional solution, the thermal element is made of copper.

[0014] As an optional solution, the thermal-magnetic tripping system further includes:

[0015] A connecting shaft is provided through which the thermal element and the armature are passed, and the armature can rotate around the connecting shaft.

[0016] As an optional solution, a limiting structure is provided on the thermal element or the armature, and the limiting structure is used to limit the armature from sliding along the extending direction of the connecting shaft.

[0017] As an optional solution, the thermal element includes:

[0018] a first component body;

[0019] Two support arms, the two support arms are spaced apart and arranged on the same side of the first element body, and the armature is rotatably connected between the two support arms;

[0020] A first connecting plate is arranged on the same side of the first component body opposite to the support arm, the iron core is arranged on a side surface of the first connecting plate facing away from the support arm, and the iron core extends out of the first connecting plate, the armature abuts against the first component body when in the first station, and the armature abuts against the iron core extending out of the first connecting plate when in the second station.

[0021] As an optional solution, a first abutment surface is provided on the side of the armature facing the first component body, and in the first working position, the first abutment surface abuts against the first component body; a second abutment surface is provided on the side of the armature facing the iron core, and in the second working position, the second abutment surface abuts against the iron core.

[0022] As an optional solution, the reset element is a tension spring.

[0023] As an optional solution, the thermal element includes:

[0024] The second element body includes a first enclosure and two second enclosures, the two second enclosures are respectively connected to the two ends of the first enclosure, the iron core is arranged on the side of the first enclosure facing away from the second enclosure, and the iron core extends to the outside of the first enclosure, the armature is rotatably connected to the two second enclosures, a limit block is arranged on the second enclosure, the armature can be rotated to abut against the limit block, and a third abutting surface is arranged on the armature, and when the iron core attracts the armature to rotate, the third abutting surface abuts against the iron core.

[0025] As an optional solution, a limiting groove is provided on the armature, and the second enclosure plate is movably inserted into the limiting groove.

[0026] The circuit breaker includes a base, a connecting plate and a traction rod, and also includes the thermal magnetic tripping system as described above, wherein the connecting plate and the thermal element are connected and fixed on the base, one end of the armature is arranged relative to the traction rod, and the rotation of the armature can drive the traction rod to flip.

[0027] Beneficial effects:

[0028] The thermal magnetic tripping system proposed in the utility model directly sets the armature and the iron core on the thermal element. On the one hand, the thermal element is used to support and limit the armature and the iron core, and no additional bracket is required. The overall structure of the thermal magnetic tripping system is simplified, and the riveting between the components is reduced, thereby reducing the instability of the magnetic gap caused by the riveting process deviation and improving the stability of the magnetic action. On the other hand, the iron core and the armature are magnetically isolated by the thermal element. The existing method of setting a bracket has a certain magnetic loss when isolating the iron core and the armature because the bracket generally adopts a steel or iron structure. The thermal element generally adopts a copper material, which can effectively isolate the magnetism and reduce the magnetic loss, thereby improving the magnetic force. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a partial structural schematic diagram of a circuit breaker provided in Embodiment 1 of the utility model;

[0030] Figure 2 It is a structural schematic diagram of the thermal magnetic tripping system and the coupling plate provided in the first embodiment of the utility model;

[0031] Figure 3 It is a structural schematic diagram of the thermal magnetic tripping system provided in the first embodiment of the utility model;

[0032] Figure 4 It is a schematic diagram of the disassembled structure of the thermal magnetic tripping system provided in the first embodiment of the utility model;

[0033] Figure 5 It is a schematic diagram of the structure of the thermal element provided in the first embodiment of the utility model;

[0034] Figure 6 It is a structural schematic diagram of the thermal magnetic tripping system provided in the second embodiment of the utility model at one viewing angle;

[0035] Figure 7 It is a structural schematic diagram of the thermal magnetic tripping system provided in the second embodiment of the utility model from another perspective;

[0036] Figure 8 It is a schematic diagram of the structure of the armature provided in the second embodiment of the utility model.

[0037] In the figure:

[0038] 10. Base; 20. Coupling plate; 30. Drawbar; 40. Thermal magnetic release system;

[0039] 1. thermal element; 11. first element body; 12. support arm; 13. first connecting plate; 14. second element body; 141. first enclosure; 1411. second boss; 142. second enclosure; 1421. stop block; 15. second connecting plate;

[0040] 2. armature; 21. first abutting surface; 22. second abutting surface; 23. third abutting surface; 24. limiting groove; 25. abutting truncated table; 26. first boss; 27. limiting boss;

[0041] 3. Reset parts;

[0042] 4. Iron core;

[0043] 5. Bimetallic strip;

[0044] 6. Adjusting screw;

[0045] 7. Connecting shaft. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0047] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0049] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0050] Embodiment 1:

[0051] like Figure 1 and Figure 2 As shown, this embodiment provides a circuit breaker, including a base 10, a connecting plate 20, a traction rod 30 and a thermal magnetic tripping system 40, wherein the connecting plate 20 and the thermal magnetic tripping system 40 are connected and fixed on the base 10. When an overload current flows through the circuit breaker, the energy generated by the connecting plate 20 is transferred to the thermal magnetic tripping system 40, and the traction rod 30 is driven to flip through the thermal magnetic tripping system 40, so that the circuit breaker mechanism is unfastened to disconnect the circuit; when the line is short-circuited and a large short-circuit current flows through the circuit breaker, the thermal magnetic tripping system 40 generates a strong magnetic field under the action of the current, and the traction rod 30 is driven to flip through the internal structure design of the thermal magnetic tripping system 40. In this embodiment, the structure of the thermal magnetic tripping system 40 is mainly improved, and the conventional structures in the prior art can be adopted for other mechanisms of the circuit breaker, which will not be described in detail here.

[0052] like Figure 3 and Figure 4As shown, the thermal magnetic tripping system 40 also proposed in this embodiment includes a thermal element 1, an armature 2 and an iron core 4, the armature 2 is rotatably connected to one side of the thermal element 1, and a reset member 3 is arranged between the thermal element 1 and the armature 2, and the reset member 3 is used to rotate the armature 2 to abut against the thermal element 1, so that the armature 2 stops at the first position. The iron core 4 is arranged on the other side of the thermal element 1, and the magnetic field generated by the iron core 4 can attract the armature 2 to rotate, so that the armature 2 abuts against the iron core 4, so that the armature 2 stops at the second position. Specifically, the thermal element 1 is made of copper.

[0053] By directly setting the armature 2 and the iron core 4 on the thermal element 1, on the one hand, the thermal element 1 is used to support and limit the armature 2 and the iron core 4, and there is no need to set up an additional bracket, which simplifies the overall structure of the thermal magnetic tripping system 40, reduces the riveting between the components, thereby reducing the instability of the magnetic gap caused by the riveting process deviation, and improving the stability of the magnetic action. On the other hand, the thermal element 1 is used to isolate the iron core 4 from the armature 2. In the existing method of setting a bracket, since the bracket is generally made of steel or iron structure, there is a certain magnetic loss when isolating the iron core 4 from the armature 2. The thermal element 1 is generally made of copper material, which can effectively isolate the magnetism, reduce the magnetic loss, and thus improve the magnetic force.

[0054] Specifically, Figure 2 As shown, the thermal element 1 is connected to the connecting plate 20. When an overload current flows through the circuit breaker, the energy generated by the connecting plate 20 is transferred to the thermal element 1. Figure 3 and Figure 4 As shown, the thermal magnetic tripping system 40 also includes a bimetallic strip 5, one end of which is connected to the thermal element 1, and the other end of the bimetallic strip 5 is provided with an adjusting screw 6, the tip of which protrudes from the inwardly bent side of the bimetallic strip 5. The bimetallic strip 5, the thermal element 1 and the iron core 4 are riveted together. One end of the bimetallic strip 5 provided with the adjusting screw 6 is arranged facing the traction rod 30, and the thermal element 1 transfers the energy generated by the connecting plate 20 to the bimetallic strip 5, the bimetallic strip 5 is deformed by heat, and the adjusting screw 6 is displaced and flipped against the traction rod 30.

[0055] Furthermore, if Figure 3 and Figure 4 As shown, the thermal magnetic tripping system 40 further includes a connecting shaft 7 , through which the thermal element 1 and the armature 2 are passed. The armature 2 can rotate around the connecting shaft 7 to achieve a rotational connection between the armature 2 and the thermal element 1 .

[0056] In order to make the armature 2 more stably installed on the thermal element 1 , a limiting structure is provided on the thermal element 1 or the armature 2 , and the limiting structure is used to limit the armature 2 from sliding along the extending direction of the connecting shaft 7 .

[0057] Specifically, if Figure 3 and Figure 4As shown, the thermal element 1 includes a second element body 14 and a second connecting plate 15. The second connecting plate 15 is connected to one side of the second element body 14 and is arranged perpendicular to the second element body 14. The second connecting plate 15 is used to be riveted to the connecting plate 20. The second element body 14 is used to support structures such as the thermal element 1, the iron core 4 and the armature 2.

[0058] Optionally, the second element body 14 includes a first enclosure 141 and two second enclosures 142, and the two second enclosures 142 are respectively connected to the two ends of the first enclosure 141 to form a frame structure. An iron core 4 is provided on the side of the first enclosure 141 away from the second enclosure 142, and the iron core 4 extends out of the first enclosure 141, and a bimetallic strip 5 is provided on the side of the first enclosure 141 facing the second enclosure 142, and the bimetallic strip 5 can be bent in the direction of the second enclosure 142, and the armature 2 is rotatably connected to the two second enclosures 142, and a limit block 1421 is provided on the second enclosure 142, and the armature 2 can be rotated to abut against the limit block 1421, at which time the armature 2 stops at the first working position, and the abutting round table 25 at the upper end of the armature 2 is away from the traction rod 30. The armature 2 is provided with a third abutting surface 23. When the core 4 attracts the armature 2 to rotate, the third abutting surface 23 abuts against the core 4. At this time, the armature 2 stops at the second working position, and the abutting cone 25 at the upper end of the armature 2 approaches the traction rod 30 and turns against the traction rod 30.

[0059] In this embodiment, a limiting groove 24 is provided on the armature 2, and the second enclosure 142 is movably inserted in the limiting groove 24. The limiting groove 24 and the second enclosure 142 are inserted and matched to form the aforementioned limiting structure, thereby preventing the armature 2 from being displaced in the axial direction of the connecting shaft 7.

[0060] Furthermore, the reset member 3 adopts a compression spring, and the two ends of the compression spring are respectively abutted against the armature 2 and the thermal element 1, and the compression spring applies elastic force to the armature 2, so that the armature 2 is pressed against the limit block 1421. When the line is short-circuited and a large short-circuit current flows through the circuit breaker, the iron core 4 generates a strong magnetic field under the action of the current, which generates an attractive force on the armature 2, so that the armature 2 overcomes the elastic force of the compression spring and rotates counterclockwise, so that the third abutting surface 23 abuts against the iron core 4.

[0061] In order to make the compression spring more firmly installed, Figure 4 and Figure 5 As shown, a first boss 26 is provided on the armature 2, a second boss 1411 is provided on the first enclosure 141, and two ends of the compression spring are respectively sleeved on the first boss 26 and the second boss 1411.

[0062] Optionally, the compression spring is arranged in the middle position between the armature 2 and the first enclosure 141, so that the force applied to the armature 2 is more uniform, which can prevent the armature 2 from being tilted due to the force and ensure that the magnetic gaps on both sides of the magnetic system are consistent, thereby improving the stability of the magnetic system operation and reducing the risk of short-circuit protection failure.

[0063] Optionally, the bimetallic strip 5 is also arranged at the middle position of the first enclosure plate 141 , wherein the compression spring is arranged at the lower side of the bimetallic strip 5 so that the compression spring is as far away from the connecting shaft 7 as possible to increase the rotational force arm of the armature 2 .

[0064] Assembly process of the thermal-magnetic trip system 40:

[0065] The bimetallic strip 5 and the iron core 4 are riveted to the thermal element 1 by rivets, and then the armature 2 is installed on the thermal element 1 through the connecting shaft 7, and then one end of the reset member 3 is sleeved on the first boss 26 on the armature 2, and the other end of the reset member 3 is sleeved on the second boss 1411 on the thermal element 1, and finally the adjusting screw 6 is screwed into the bimetallic strip 5 and tightened. The armature 2 can make an arc motion around the shaft connecting shaft 7, and the side of the armature 2 provided with the limiting groove 24 abuts against the limiting block 1421, and the third abutting surface 23 on the armature 2 abuts against the iron core 4 to limit the motion trajectory of the armature 2, and the limiting groove 24 cooperates with the second enclosure 142 to limit the armature 2 in the extending direction of the connecting shaft 7.

[0066] Control principle of thermal-magnetic trip system 40:

[0067] When an overload current flows through the circuit breaker, the energy generated by the connecting plate 20 is transferred to the bimetallic strip 5 through the thermal element 1. The bimetallic strip 5 bends due to the heat, driving the traction rod 30 to flip, so that the circuit breaker mechanism is unfastened and the circuit breaker disconnects the circuit, thereby achieving the purpose of protecting the power safety of the line and the safety of the equipment.

[0068] When the line is short-circuited and a large short-circuit current flows through the circuit breaker, the iron core 4 generates a strong magnetic field under the action of the current, attracting the armature 2 to flip, and the contacting truncated cone 25 of the armature 2 hits the traction rod 30, causing the traction rod 30 to rotate, driving the circuit breaker mechanism to trip, and the circuit breaker disconnects the circuit, achieving the purpose of protecting the safety of line electricity and equipment. After power failure, the armature 2 is reset under the action of the reset member 3.

[0069] Embodiment 2:

[0070] like Figure 6-Figure 8 As shown, this embodiment provides a thermal magnetic tripping system 40 and a circuit breaker, which are basically the same as the first embodiment, except that:

[0071] The thermal element 1 comprises a first element body 11, two support arms 12 and a first connecting plate 13, and a bimetallic strip 5 is connected to the first element body 11. The two support arms 12 are arranged at intervals on the same side of the first element body 11, and the armature 2 is rotatably connected between the two support arms 12, and the abutting truncated cone 25 on the armature 2 is inclined toward the bimetallic strip 5. The first connecting plate 13 and the support arms 12 are arranged on the same side of the first element body 11, and an iron core 4 is arranged on a side surface of the first connecting plate 13 away from the support arms 12, and the iron core 4 extends out of the first connecting plate 13. The armature 2 abuts against the first element body 11 when in the first station, and the armature 2 abuts against the iron core 4 extending out of the first connecting plate 13 when in the second station.

[0072] The first element body 11 and the second element body 14 have the same shape and are a frame structure, but because the support arm 12, the armature 2 and the iron core 4 are arranged outside the frame structure, the size of the frame structure can be set to be smaller than the size of the second element body 14.

[0073] The first connecting plate 13 is disposed perpendicular to the first element body 11 and is located below the support arm 12. The iron core 4 and the connecting plate 20 are fixed to the first connecting plate 13 by riveting.

[0074] Optionally, a first abutting surface 21 is provided on the side of the armature 2 facing the first element body 11, and in the first working position, the first abutting surface 21 abuts against the first element body 11; a second abutting surface 22 is provided on the side of the armature 2 facing the iron core 4, and in the second working position, the second abutting surface 22 abuts against the iron core 4.

[0075] Furthermore, if Figure 8 As shown, in order to ensure that the armature 2 is firmly mounted on the thermal element 1, a limiting boss 27 is provided on the outer side of the armature 2 around the connecting shaft 7. The limiting boss 27 can abut against the support arm 12 to prevent the armature 2 from being displaced or swinging along the axial direction of the connecting shaft 7.

[0076] Specifically, the reset member 3 is a tension spring, both ends of which are respectively connected to the thermal element 1 and the armature 2 . The tension spring applies a pulling force to the armature 2 , causing the armature 2 to rotate clockwise and abut against the first element body 11 .

[0077] Assembly process of the thermal-magnetic trip system 40:

[0078] The bimetallic strip 5 is riveted to the first element body 11 by rivets, and then the armature 2 is installed on the support arm 12 of the thermal element 1 through the connecting shaft 7, and then one end of the reset member 3 is hung on the armature 2, and the other end of the reset member 3 is hung on the first element body 11, and then the adjusting screw 6 is screwed into the bimetallic strip 5 and tightened. The armature 2 can make an arc motion around the connecting shaft 7, and the first abutting surface 21 and the second abutting surface 22 on the armature 2 limit the motion trajectory of the armature 2, and the limiting boss 27 limits the axial direction of the armature 2 connecting shaft 7. Finally, the iron core 4, the connecting plate 20 and the first connecting plate 13 are fixed on the base 10 by fasteners (such as screws or bolts).

[0079] The control principle of the thermal-magnetic tripping system 40 proposed in this embodiment is the same as that of the first embodiment, and will not be repeated here.

[0080] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Thermal magnetic tripping system, characterized in that: include: Thermal element (1); An armature (2) is rotatably connected to one side of the thermal element (1), a reset member (3) is provided between the thermal element (1) and the armature (2), and the reset member (3) is used to rotate the armature (2) until it abuts against the thermal element (1), so that the armature (2) stops at a first position; An iron core (4) is arranged on the other side of the thermal element (1); the magnetic field generated by the iron core (4) can attract the armature (2) to rotate, so that the armature (2) abuts against the iron core (4), so that the armature (2) stops at the second working position.

2. The thermal magnetic tripping system according to claim 1, characterized in that: The thermal magnetic tripping system also includes: A bimetallic strip (5), one end of which is connected to the thermal element (1), and the other end of which is provided with an adjusting screw (6), the tip of which protrudes from the inwardly bent side of the bimetallic strip (5).

3. The thermal magnetic tripping system according to claim 1, characterized in that: The thermal element (1) is made of copper.

4. The thermal magnetic tripping system according to claim 1, characterized in that: The thermal magnetic tripping system also includes: A connecting shaft (7), wherein the connecting shaft (7) passes through the thermal element (1) and the armature (2), and the armature (2) is capable of rotating around the connecting shaft (7).

5. The thermal magnetic tripping system according to claim 4, characterized in that: A limiting structure is provided on the thermal element (1) or the armature (2), and the limiting structure is used to limit the sliding of the armature (2) along the extension direction of the connecting shaft (7).

6. The thermal magnetic tripping system according to any one of claims 1 to 5, characterized in that: The thermal element (1) comprises: A first element body (11); Two support arms (12), the two support arms (12) are arranged at intervals on the same side of the first element body (11), and the armature (2) is rotatably connected between the two support arms (12); A first connecting plate (13) is arranged on the same side of the first element body (11) as the supporting arm (12); the iron core (4) is arranged on a side surface of the first connecting plate (13) facing away from the supporting arm (12), and the iron core (4) extends out of the first connecting plate (13); the armature (2) abuts against the first element body (11) when in the first working position; and the armature (2) abuts against the iron core (4) extending out of the first connecting plate (13) when in the second working position.

7. The thermal magnetic tripping system according to claim 6, characterized in that: A first abutting surface (21) is provided on the side of the armature (2) facing the first element body (11), and in the first working position, the first abutting surface (21) abuts against the first element body (11); a second abutting surface (22) is provided on the side of the armature (2) facing the iron core (4), and in the second working position, the second abutting surface (22) abuts against the iron core (4).

8. The thermal magnetic tripping system according to claim 6, characterized in that: The reset element (3) is a tension spring.

9. The thermal magnetic tripping system according to any one of claims 1 to 5, characterized in that: The thermal element (1) comprises: The second element body (14) comprises a first enclosure plate (141) and two second enclosure plates (142), wherein the two second enclosure plates (142) are respectively connected to the two ends of the first enclosure plate (141), the iron core (4) is arranged on the side of the first enclosure plate (141) away from the second enclosure plate (142), and the iron core (4) extends to the outside of the first enclosure plate (141), the armature (2) is rotatably connected to the two second enclosure plates (142), a limit block (1421) is arranged on the second enclosure plate (142), the armature (2) can be rotated to abut against the limit block (1421), and a third abutting surface (23) is arranged on the armature (2), and when the iron core (4) attracts the armature (2) to rotate, the third abutting surface (23) abuts against the iron core (4).

10. The thermal magnetic tripping system according to claim 9, characterized in that: The armature (2) is provided with a limiting groove (24), and the second enclosure plate (142) is movably inserted into the limiting groove (24).

11. A circuit breaker comprising a base (10), a coupling plate (20) and a traction rod (30), characterized in that: It also includes a thermal magnetic tripping system as described in any one of claims 1 to 10, wherein the connecting plate (20) and the thermal element (1) are connected and fixed to the base (10), one end of the armature (2) is arranged relative to the traction rod (30), and the rotation of the armature (2) can drive the traction rod (30) to flip.

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