Thermomagnetic release and circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliances, and particularly discloses a thermomagnetic release and a circuit breaker. According to the thermomagnetic release provided by the utility model, the short-circuit bar is connected in series with the two moving contacts, so that series connection of a two-pole conductive loop is realized, the magnet yoke of the magnetic release assembly is connected with the short-circuit bar, and current flowing through the short-circuit bar can enable the magnet yoke to generate a magnetic field, so that the armature acts to strike the draw bar of the operating mechanism, the operating mechanism is released, and the function of magnetic release is realized; on the other hand, the bimetal piece is connected with the short circuit bar, and heat of the short circuit bar can be transmitted to the bimetal piece, so that the bimetal piece is deformed to push a draw bar of the operating mechanism, the operating mechanism is tripped, and the function of thermal tripping is realized; through the arrangement of the short circuit bar, series connection of two-stage conductive loops is realized, the structure of the thermomagnetic release can satisfy the internal series connection structure of the DC circuit breaker, the number of used release is reduced, and the miniaturization design of the circuit breaker is realized.

Description

Technical Field

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

[0002] As the core component of the molded case circuit breaker, the release has protection functions such as short circuit, overload and undervoltage. When a fault current appears in the circuit system, the release will perform the tripping action and cooperate with the operating mechanism to complete the unlocking, so that the circuit breaker can quickly cut off the circuit, thereby protecting the power distribution system, electrical equipment and the safety of the staff. At present, thermal magnetic releases are mainly divided into two structures: snap-on type and screw-on type. The working principle of both is that when the circuit current rises, the yoke or coil is magnetized to generate magnetic attraction, which in turn attracts the moving iron core to move, and finally the circuit breaker is opened by striking the unlocking structure of the operating mechanism. The unlocking speed of the release also directly affects the breaking performance of the circuit breaker.

[0003] As the current requirements for the breaking parameters of circuit breakers are getting higher and higher, and circuit breakers are gradually developing in the direction of small size and high breaking, the size of the release is also being continuously compressed. In DC circuit breakers, due to the series connection between poles, the structure of the existing thermal magnetic release cannot meet the structure of the DC circuit breaker after the series connection, and cannot achieve the purpose of miniaturization of the circuit breaker design. Utility Model Content

[0004] The utility model aims to provide a thermal magnetic release and a circuit breaker, which can connect two-pole conductive circuits in series without affecting the function of the release, thereby reducing the number of releases used and realizing a miniaturized design of the circuit breaker.

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

[0006] On the one hand, a thermal magnetic release is provided, comprising:

[0007] Shorting bar, used to connect two moving contacts in series;

[0008] A magnetic trip assembly, comprising a bracket, a yoke and an armature, wherein the yoke is connected to the short-circuit bar, the bracket is connected to the yoke, the armature is rotatably connected to the bracket, and one end of the armature can be attracted to the yoke, and the other end of the armature is used to strike the traction rod of the operating mechanism;

[0009] The thermal trip assembly comprises a bimetallic piece, one end of which is connected to the short-circuit bar, and the other end of which is used to push the traction rod of the operating mechanism.

[0010] As an optional technical solution of the above-mentioned thermal magnetic release, the yoke is a U-shaped structure, the short-circuit bar is provided with a plug interface, one end of the yoke is penetrated by the plug interface, and part of the short-circuit bar is abutted against the bottom of the yoke.

[0011] As an optional technical solution for the above-mentioned thermal magnetic release, one side of the yoke is recessed with a notch at the end, and a first connecting portion is provided at the notch, the first connecting portion is connected to the bottom of the yoke, a second connecting portion is protruding from the first edge of the short-circuit row, the plug interface is penetrated at one end of the yoke, one side of the second connecting portion is fitted and connected to the first connecting portion, and one end of the bimetallic piece is fitted and connected to the other side of the second connecting portion.

[0012] As an optional technical solution for the above-mentioned thermal-magnetic release, a shunt portion is provided on the short-circuit bar, and the shunt portion includes a shunt opening, one end of the shunt opening passes through the second edge of the short-circuit bar, and the other end of the shunt opening is connected to the plug interface, and the shunt opening and the plug interface are distributed in an L shape.

[0013] As an optional technical solution of the above-mentioned thermal magnetic release, an elastic member is connected between the other end of the armature and the bracket, and the elastic member is used to make the other end of the armature tend to move away from the traction rod of the operating mechanism.

[0014] As an optional technical solution of the above-mentioned thermal-magnetic release, two welding parts are protruded at intervals on the second edge of the short-circuit row, and the welding parts are used to be connected to the moving contact through a flexible connector.

[0015] As an optional technical solution of the above-mentioned thermal-magnetic release, a positioning groove is recessed on the second edge of the short-circuit row.

[0016] On the other hand, a circuit breaker is provided, comprising a base and any one of the above-mentioned thermal-magnetic releasers, wherein an operating mechanism and a plurality of moving contacts are arranged in the base, the thermal-magnetic releaser is arranged in the base, and the short-circuit bar is plugged into the base.

[0017] As an optional technical solution for the above-mentioned circuit breaker, a positioning column and a plurality of slots are provided in the base, the second edge of the short-circuit row is inserted into the slot, and the positioning column is inserted into the positioning slot recessed in the second edge of the short-circuit row.

[0018] As an optional technical solution for the above-mentioned circuit breaker, a phase partition is provided between adjacent phases in the base, the phase partition between the two moving contacts connected to the short-circuit bar is provided with the slot passing through both sides of the phase partition, the bottom of the slot is provided with the positioning column, and the magnetic trip assembly and the thermal trip assembly are arranged on one side of the phase partition.

[0019] As an optional technical solution of the above-mentioned circuit breaker, a first limiting member is inserted into the slot of the phase partition, and the first limiting member is pressed against the short-circuit bar in the slot.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides a thermal magnetic release, in which a short-circuit bar is connected in series with two moving contacts, thereby realizing a series two-pole conductive circuit. The yoke of the magnetic release assembly is connected to the short-circuit bar, and the current flowing through the short-circuit bar can cause the yoke to generate a magnetic field, thereby causing the armature to move to hit the traction rod of the operating mechanism, causing the operating mechanism to trip, thereby realizing the function of magnetic tripping. On the other hand, a bimetallic piece is connected to the short-circuit bar, and the heat of the short-circuit bar can be transferred to the bimetallic piece, causing the bimetallic piece to deform to push the traction rod of the operating mechanism, causing the operating mechanism to trip, thereby realizing the function of thermal tripping. By arranging the short-circuit bar, not only is a two-stage conductive circuit in series realized, so that the structure of the thermal magnetic releaser can meet the structure of the internal series connection of the DC circuit breaker, but also the number of releasers used is reduced, thereby realizing the miniaturized design of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a partial structural schematic diagram of a circuit breaker provided by an embodiment of the utility model;

[0023] Figure 2 It is a structural schematic diagram of a first contact group and a second contact group provided in an embodiment of the utility model;

[0024] Figure 3 It is an axial view of the thermal magnetic release provided by the embodiment of the utility model;

[0025] Figure 4 It is a schematic diagram of the exploded structure of the thermal magnetic release provided by the embodiment of the utility model;

[0026] Figure 5 It is a schematic diagram of the structure of the short-circuit bar provided in an embodiment of the utility model;

[0027] Figure 6 is a side view of a first contact group and a second contact group provided by an embodiment of the utility model;

[0028] Figure 7 It is a partial structural isometric view of the base provided by the embodiment of the utility model;

[0029] Figure 8 It is a top view of the base provided by the embodiment of the utility model;

[0030] Fig. 9 It is a partial structural exploded schematic diagram of a circuit breaker provided by an embodiment of the utility model;

[0031] Fig.10 It is a cross-sectional view of a local structure of a circuit breaker provided by an embodiment of the utility model;

[0032] Fig.11 It is a structural schematic diagram of a circuit breaker provided by an embodiment of the utility model in an open state and an armature of a trip device in a free state;

[0033] Fig.12 It is a structural schematic diagram of a circuit breaker provided by an embodiment of the utility model in a closed state and an armature of a tripper in an attracted state.

[0034] In the figure:

[0035] 1. Short-circuit bar; 2. Magnetic trip assembly; 3. Thermal trip assembly;

[0036] 11. second connecting portion; 12. diverter portion; 13. welding portion; 14. positioning groove; 15. plug-in interface;

[0037] 21. bracket; 211. limit part; 22. yoke; 221. notch; 222. first connecting part; 23. armature; 231. release position; 24. elastic member;

[0038] 31. Bimetallic part; 32. Adjusting bolt; 33. Adjusting nut;

[0039] 100, operating mechanism; 101, traction rod; 200, flexible connector; 300, base; 301, positioning column; 302, slot; 400, first contact group; 401, moving contact; 402, first static contact; 403, second static contact; 404, first wiring terminal; 405, second wiring terminal; 406, transfer row; 500, second contact group; 501, third static contact; 502, third wiring terminal; 503, fourth wiring terminal; 600, phase partition; 700, baffle; 800, first limit member; 900, second limit member. DETAILED DESCRIPTION

[0040] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0041] 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.

[0042] 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.

[0043] like Figure 1 and Figure 2 As shown, this embodiment provides a circuit breaker, which includes a base 300, a first contact group 400, a second contact group 500, an operating mechanism 100 and a thermal magnetic release. The first contact group 400, the second contact group 500, the operating mechanism 100 and the thermal magnetic release are all arranged in the base 300. The first contact group 400 includes a first static contact 402, a second static contact 403 and two moving contacts 401. The two moving contacts 401 of the first contact group 400 are connected in series through the thermal magnetic release. The first static contact 402 is connected to the first terminal 404, and the second static contact 403 is connected to the second terminal 405. The second contact group 500 includes a moving contact 401 and a third static contact 501. The third static contact 501 is connected to the third terminal 502, and the moving contact 401 of the second contact group 500 is connected to the fourth terminal 503. The circuit breaker is a two-pole DC circuit breaker with internal series connection. The second wiring terminal 405 and the fourth wiring terminal 503 are connected to two ends of the load, and the current flows from the first wiring terminal 404 to the second wiring terminal 405, the load, the fourth wiring terminal 503 and the third wiring terminal 502, forming a conductive loop.

[0044] Phase partitions 600 are provided between adjacent phases in the base 300 , that is, to separate adjacent static contacts and moving contacts 401 , so as to prevent adjacent moving contacts 401 and static contacts from being short-circuited and affecting the normal operation of the circuit breaker.

[0045] like Figure 3 and Figure 4As shown, the thermal magnetic release includes a short-circuit bar 1, a magnetic trip assembly 2 and a thermal trip assembly 3. The short-circuit bar 1 is used to connect two moving contacts 401 in series. The magnetic trip assembly 2 includes a bracket 21, a yoke 22 and an armature 23, the yoke 22 is connected to the short-circuit bar 1, the bracket 21 is connected to the yoke 22, the armature 23 is rotatably connected to the bracket 21, and one end of the armature 23 can be attracted to the yoke 22, and the other end of the armature 23 is used to strike the traction rod 101 of the operating mechanism 100. The thermal trip assembly 3 includes a bimetallic piece 31, one end of the bimetallic piece 31 is connected to the short-circuit bar 1, and the other end of the bimetallic piece 31 is used to push the traction rod 101 of the operating mechanism 100.

[0046] The short-circuit bar 1 is connected in series with two moving contacts 401, realizing a series two-pole conductive circuit. The yoke 22 of the magnetic trip assembly 2 is connected to the short-circuit bar 1. The current flowing through the short-circuit bar 1 can cause the yoke 22 to generate a magnetic field, thereby causing the armature 23 to move to hit the traction rod 101 of the operating mechanism 100, causing the operating mechanism 100 to trip, thereby realizing the function of magnetic tripping. On the other hand, the bimetallic piece 31 is connected to the short-circuit bar 1. The heat of the short-circuit bar 1 can be transferred to the bimetallic piece 31, causing the bimetallic piece 31 to deform to push the traction rod 101 of the operating mechanism 100, causing the operating mechanism 100 to trip, thereby realizing the function of thermal tripping. By setting the short-circuit bar 1, not only a series two-stage conductive circuit is realized, so that the structure of the thermal magnetic releaser can meet the internal series structure of the DC circuit breaker, but also the number of releasers used is reduced, thereby realizing the miniaturized design of the circuit breaker.

[0047] In some embodiments, the yoke 22 is a U-shaped structure, a plug interface 15 is provided on the short-circuit bar 1, one end of the yoke 22 is penetrated by the plug interface 15, and part of the short-circuit bar 1 is in contact with the bottom plate of the yoke 22. The direction of the current flowing through the yoke 22 is horizontal, and the yoke 22 is magnetized by the magnetic effect of the current, generating a magnetic attraction at the opening of the yoke 22, one end of the armature 23 is arranged corresponding to the opening of the yoke 22, and the end of the yoke 22 attracts the armature 23, so that the other end of the armature 23 hits the traction rod 101 of the operating mechanism 100. Optionally, the bottom of the yoke 22 is connected to the short-circuit bar 1 through a riveted structure.

[0048] Optionally, a notch 221 is recessed at one end of the yoke 22, a first connection portion 222 is provided at the notch 221, the first connection portion 222 is connected to the bottom of the yoke 22, a second connection portion 11 is convexly provided at the first edge of the short-circuit bar 1, a plug-in interface 15 is provided at one end of the yoke 22, one side of the second connection portion 11 is fitted and connected to the first connection portion 222, the contact area between the yoke 22 and the short-circuit bar 1 is increased, the rate at which the yoke 22 generates a magnetic field is accelerated, and the breaking performance of the circuit breaker is improved. Optionally, the second connection portion 11 is connected to the first connection portion 222 by a riveting structure.

[0049] Alternatively, if Figure 5As shown, a shunt portion 12 is provided on the short-circuit bar 1, and the shunt portion 12 includes a shunt opening, one end of the shunt opening passes through the second edge of the short-circuit bar 1, and the other end of the shunt opening is connected to the plug interface 15, and the shunt opening and the plug interface 15 are L-shaped. The second edge is arranged relative to the first edge. The shunt portion 12 can adjust the current density of the current loop where the yoke 22 is located, and the size of the electromagnetic attraction generated by the yoke 22 after being magnetized and the temperature rise at the connection between the yoke 22 and the short-circuit bar 1 can be adjusted by adjusting the size of the shunt opening area. When the shunt opening area is large, the electromagnetic attraction of the magnetized yoke 22 is small, and the temperature rise at the connection between the yoke 22 and the short-circuit bar 1 is small. When the shunt opening area is small, the electromagnetic attraction of the magnetized yoke 22 is large, and the temperature rise at the connection between the yoke 22 and the short-circuit bar 1 is large. In summary, without changing other structures of the magnetic trip assembly 2, the size of the tripping current of the magnetic trip assembly 2 can be controlled by changing the size of the shunt opening area.

[0050] Continue to refer to Figure 4 As shown, an elastic member 24 is connected between the other end of the armature 23 and the bracket 21, and the elastic member 24 is used to make the other end of the armature 23 have a tendency to move away from the traction rod 101 of the operating mechanism 100. When the yoke 22 has no electromagnetic attraction, the elastic member 24 resets the other end of the armature 23 and no longer triggers the traction rod 101 of the operating mechanism 100.

[0051] Furthermore, a limit portion 211 is provided on the bracket 21, and the limit portion 211 is used to limit the rotation angle of the armature 23 when the traction rod 101 of the operating mechanism 100 is not triggered. The other end of the armature 23 is provided with two tripping gears 231 for hitting the traction rod 101 of the operating mechanism 100, and each tripping gear 231 is respectively provided with an elastic member 24 and a limit portion 211.

[0052] Optionally, one end of the bimetal 31 is respectively fitted and connected to the short-circuit bar 1 and the second connecting portion 11, thereby increasing the contact area between the bimetal 31 and the short-circuit bar 1, accelerating the rate at which the bimetal 31 is deformed by heat, and improving the breaking performance of the circuit breaker. Optionally, the bimetal 31 is connected to the short-circuit bar 1 and the second connecting portion 11 by a riveted structure.

[0053] The other end of the bimetal 31 is provided with an adjusting bolt 32, one end of which penetrates the bimetal 31 and is used to push the traction rod 101 of the operating mechanism 100. The adjusting bolt 32 is screwed to the bimetal 31, and the other end of the adjusting bolt 32 is screwed to an adjusting nut 33 to fix the adjusting bolt 32 on the bimetal 31.

[0054] In some embodiments, see Figure 5 and Figure 6As shown, two welding parts 13 are protruded at intervals on the second edge of the short-circuit bar 1. The welding parts 13 are used to connect with the moving contact 401 through the flexible connector 200, so as to realize the series connection of the two moving contacts 401 without affecting the movement of the moving contact 401.

[0055] Combination Figure 5 , Figure 7 and Figure 8 As shown, the short-circuit bar 1 is inserted into the base 300, which is convenient for installing the short-circuit bar 1. The second edge of the short-circuit bar 1 is recessed with a positioning groove 14, and the base 300 is provided with a positioning column 301, which is inserted into the positioning groove 14 to position the installation of the short-circuit bar 1. The base 300 is also provided with a plurality of slots 302, and the second edge of the short-circuit bar 1 is inserted into the slot 302, and the positioning column 301 is inserted into the positioning groove 14 at the same time. The cooperation between the slot 302 and the positioning column 301 plays a role in fixing the short-circuit bar 1, and the structure is simple.

[0056] The two welding parts 13 are symmetrically arranged relative to the positioning groove 14, and the magnetic trip assembly 2 and the thermal trip assembly 3 are both arranged on the same side of the positioning groove 14, that is, the magnetic trip assembly 2 and the thermal trip assembly 3 have two installation positions, but do not affect the function of the thermal magnetic release.

[0057] Since a phase partition 600 is provided between adjacent phases, the short-circuit bar 1 is also required to be placed in the base 300 when two moving contacts 401 are connected in series, so the short-circuit bar 1 needs to cross the phase partition 600. In order to achieve the installation of the short-circuit bar 1, a clamping groove 302 that passes through both sides of the phase partition 600 is provided on the phase partition 600, and a positioning column 301 is provided at the bottom of the clamping groove 302. At least one clamping groove 302 is also provided in the base 300 on both sides of the phase partition 600. The second edge of the short-circuit bar 1 is clamped in the clamping groove 302, and the positioning column 301 is inserted into the positioning groove 14.

[0058] like Fig. 9 and Fig.10 As shown, in order to ensure that the short-circuit bar 1 can be stably connected to the card slot 302, further optionally, a first stopper 800 is inserted into the card slot 302 of the interphase baffle 600, and the first stopper 800 is pressed against the short-circuit bar 1 in the card slot 302. Optionally, a plug-in block is provided on one side of the interphase baffle 600, and the plug-in block is provided with a plug-in slot along the plug-in direction of the short-circuit bar 1, a part of the first stopper 800 is inserted into the card slot 302, and another part of the first stopper 800 is inserted into the plug-in slot.

[0059] Reference Figure 1 , Figure 2 and Fig. 9As shown, the first wiring terminal 404 and the second wiring terminal 405 of the circuit breaker provided in this embodiment are arranged opposite to each other, but the first static contact 402 and the second static contact 403 are arranged in parallel in the same plane, so the second wiring terminal 405 is connected to the second static contact 403 through the adapter bar 406, so that the second wiring terminal 405 is arranged opposite to the first wiring terminal 404. The adapter bar 406 is arranged in the base 300, and the adapter bar 406 is arranged close to the short-circuit bar 1. In order to prevent the adapter bar 406 and the short-circuit bar 1 from short-circuiting and affecting the normal operation of the circuit breaker, a baffle plate 700 is arranged in the base 300, and the baffle plate 700 isolates the adapter bar 406 from the short-circuit bar 1. The baffle plate 700 divides the phase partition 600 into two parts, one end of the transfer row 406 is connected to the second static contact 403, and the other end of the transfer row 406 needs to cross the phase partition 600 to connect with the second terminal 405. In order to facilitate the installation of the transfer row 406, the phase partition 600 is provided with a avoidance groove that runs through both sides of the phase partition 600, and the other end of the transfer row 406 is penetrated by the avoidance groove. Further optionally, a second stopper 900 is inserted in the avoidance groove, and the second stopper 900 presses on the transfer row 406 in the avoidance groove to fix the position of the transfer row 406.

[0060] Fig.11 The structure diagram shown is that the armature 23 of the release is in a free state, and the circuit breaker is in an open state. Under the action of the elastic member 24, the armature 23 is separated from the yoke 22, and the armature 23 is limited by the limiter 211. Under the rated current, the current in the conductive circuit flows through the yoke 22. Since there is a gap between the armature 23 and the yoke 22, the electromagnetic attraction generated by the magnetized yoke 22 is not enough to overcome the elastic tension of the elastic member 24. Similarly, under the rated current, the short-circuit bar 1 does not generate a high temperature at the position where the bimetallic member 31 is connected to cause it to bend and deform greatly, so the release is in a normal working state.

[0061] Fig.12 The structure diagram shown is a diagram of the armature 23 of the release in the attracted state, and the circuit breaker is in the closed state. The short-circuit current in the conductive circuit flows through the yoke 22. Since the short-circuit current is relatively large, the electromagnetic attraction generated by the magnetized yoke 22 is sufficient to overcome the elastic tension of the elastic member 24. Under the action of the electromagnetic attraction, the armature 23 rotates until it contacts the yoke 22, and the other end of the armature 23 hits the traction rod 101 of the operating mechanism 100, causing the operating mechanism 100 to perform a tripping action. Similarly, in the case of a current higher than the rated current, the short-circuit bar 1 generates a higher temperature at the position where the bimetallic member 31 is connected, causing it to bend and deform greatly, and the other end of the bimetallic member 31 pushes the traction rod 101 of the operating mechanism 100, causing the operating mechanism 100 to perform a tripping action.

[0062] The setting of the short-circuit bar 1 not only plays the role of connecting the internal circuit of the circuit breaker in series, but also realizes the tripping protection function of the circuit breaker.

[0063] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. 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 protection scope of the claims of the present invention.

Claims

1. Thermal magnetic release, characterized in that: include: A shorting bar (1) for connecting two moving contacts (401) in series; A magnetic trip assembly (2) comprises a bracket (21), a yoke (22) and an armature (23), wherein the yoke (22) is connected to the short-circuit bar (1), the bracket (21) is connected to the yoke (22), the armature (23) is rotatably connected to the bracket (21), one end of the armature (23) can be attracted to the yoke (22), and the other end of the armature (23) is used to strike a traction rod (101) of an operating mechanism (100); The thermal release assembly (3) comprises a bimetallic piece (31), one end of the bimetallic piece (31) is connected to the short-circuit bar (1), and the other end of the bimetallic piece (31) is used to push the traction rod (101) of the operating mechanism (100).

2. The thermal magnetic release according to claim 1, characterized in that: The magnetic yoke (22) is a U-shaped structure, the short-circuit bar (1) is provided with a plug-in interface (15), one end of the magnetic yoke (22) is penetrated by the plug-in interface (15), and part of the short-circuit bar (1) is in contact with the bottom of the magnetic yoke (22).

3. The thermal magnetic release according to claim 2, characterized in that: One side of the yoke (22) is provided with a notch (221) at the end, a first connecting portion (222) is provided at the notch (221), the first connecting portion (222) is connected to the bottom of the yoke (22), a second connecting portion (11) is provided protrudingly on the first edge of the short-circuit bar (1), the plug-in interface (15) is provided at one end of the yoke (22), one side of the second connecting portion (11) is fitted and connected to the first connecting portion (222), and one end of the bimetallic member (31) is fitted and connected to the other side of the second connecting portion (11).

4. The thermal magnetic release according to claim 2, characterized in that: The short-circuit bar (1) is provided with a diverter portion (12), the diverter portion (12) comprising a diverter opening, one end of the diverter opening passing through the second edge of the short-circuit bar (1), the other end of the diverter opening being in communication with the plug interface (15), and the diverter opening and the plug interface (15) being distributed in an L shape.

5. The thermal magnetic release according to any one of claims 1 to 4, characterized in that: An elastic member (24) is connected between the other end of the armature (23) and the bracket (21), and the elastic member (24) is used to make the other end of the armature (23) tend to move away from the traction rod (101) of the operating mechanism (100).

6. The thermal magnetic release according to any one of claims 1 to 4, characterized in that: Two welding portions (13) are protruded at intervals on the second edge of the short-circuit bar (1), and the welding portions (13) are used to be connected to the moving contact (401) via a flexible connector (200).

7. The thermal magnetic release according to any one of claims 1 to 4, characterized in that: A positioning groove (14) is recessed on the second edge of the short-circuit bar (1).

8. A circuit breaker, characterized in that The invention comprises a base (300) and a thermal-magnetic release as described in any one of claims 1 to 7, wherein an operating mechanism (100) and a plurality of moving contacts (401) are arranged in the base (300), the thermal-magnetic release is arranged in the base (300), and the short-circuit bar (1) is plugged into the base (300).

9. The circuit breaker according to claim 8, characterized in that The base (300) is provided with a positioning column (301) and a plurality of slots (302), the second edge of the short-circuit bar (1) is inserted into the slot (302), and the positioning column (301) is inserted into a positioning slot (14) recessed on the second edge of the short-circuit bar (1).

10. The circuit breaker according to claim 9, characterized in that A phase partition (600) is provided between adjacent phases in the base (300); a slot (302) penetrating both sides of the phase partition (600) is provided on the phase partition (600) between the two moving contacts (401) connected to the short-circuit bar (1); a positioning column (301) is provided at the bottom of the slot (302); and the magnetic trip assembly (2) and the thermal trip assembly (3) are arranged on one side of the phase partition (600).

11. The circuit breaker according to claim 10, characterized in that A first limiting member (800) is inserted into the slot (302) of the phase partition (600), and the first limiting member (800) is pressed against the short-circuit bar (1) in the slot (302).

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