Electromagnetic release and circuit breaker

Abstract

The electromagnetic release comprises a shell, the shell is provided with a driving hole, an ejector rod is assembled in the driving hole in a sliding mode, a driving mechanism is assembled in the shell and comprises a magnet yoke, a coil assembly, an armature, a supporting piece and a magnet, the armature is assembled on the supporting piece in a sliding mode, and the magnet yoke and the coil assembly are matched to drive the armature to act in the shell. The armature drives the ejector rod to slide along the driving hole, the magnet and the coil assembly are arranged side by side, the coil assembly comprises a coil framework, a top plate and / or a bottom plate of the coil framework extend in the direction close to the magnet to form a limiting plate, the limiting plate is provided with a positioning groove, and one end of the magnet is inserted into the positioning groove in a limited mode. According to the utility model, the positioning groove is arranged on the coil framework, and the magnet is limited and assembled in the positioning groove, so that the coil framework and the magnet can form a modular structure, the assembly process is simplified, and the assembly is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of low voltage apparatus, concretely relates to an electromagnetic release and circuit breaker. BACKGROUND

[0002] The circuit breaker is a kind of low voltage apparatus with wide application, and the electromagnetic release is an important component in the circuit breaker with leakage protection function, when the leakage current appears in the main line connected to the circuit breaker, the electromagnetic release triggers the operating mechanism in the circuit breaker to release, and the existing electromagnetic release has the following defects: first, most of the magnets adopt riveting, laser spot welding or glue sealing, which is complicated to operate and increases assembly steps;Second, the impact of armature will inevitably cause wear, resulting in the reduction and failure of the performance of electromagnetic release, affecting the service life and reliability of the product. SUMMARY

[0003] The utility model aims at overcoming at least one defect of prior art, and provides an electromagnetic release and circuit breaker.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] The utility model provides a kind of electromagnetic release, including shell, the shell is equipped with driving hole, top rod is slidably assembled in the driving hole, driving mechanism is assembled in the shell, the driving mechanism includes magnetic yoke, coil assembly, armature, support and magnet, the armature is slidably assembled on support, the magnetic yoke and coil assembly cooperate and drive armature to act in shell, the top rod is slid along driving hole by the armature drive, the magnet is arranged side by side with coil assembly, the coil assembly includes coil framework, the top plate of coil framework and / or bottom plate extends in the direction close to magnet and forms limit plate, the limit plate is equipped with positioning groove, one end of the magnet is limitedly inserted into positioning groove.

[0006] Preferably, the coil framework includes hollow coil shaft, the both ends of coil shaft are equipped with top plate and bottom plate, the top plate extends in the direction close to magnet and forms limit plate, the limit plate is equipped with positioning groove, one end of the magnet is limitedly inserted into positioning groove, the bottom plate extends in the direction close to magnet and forms abutment plate, the abutment plate is in abutment with the other end of the magnet.

[0007] Preferably, the bottom plate of coil framework is further equipped with limiting portion, at least one clamping portion is arranged in the shell, and the limiting portion is in limiting abutment with the clamping portion.

[0008] Preferably, the magnetic yoke comprises two spaced-apart connecting arms, a fixing plate is connected between the two connecting arms, so that the magnetic yoke has a U-shaped structure, one of the connecting arms passes through the middle of the coil frame, so that the bottom plate of the coil frame is located on the fixing plate, the end faces of the two connecting arms away from the fixing plate are spaced-apart from the attraction part and the armature, the fixing plate is fixed in the shell and opposite to the armature, one end of the magnet is fixed on the fixing plate between the two connecting arms, and the other end of the magnet is opposite to the armature.

[0009] Preferably, the width of one end of the magnet is greater than the width of the fixing plate, and the width of the abutting plate is less than the width of the fixing plate.

[0010] Preferably, the shell further comprises a buffer assembly, the buffer assembly is located between the driving mechanism and the ejector rod, and the side of the buffer assembly away from the ejector rod is in limiting fit with the coil frame.

[0011] Preferably, the buffer assembly comprises a mounting plate and a buffer plate, the mounting plate is located in the shell between the driving mechanism and the ejector rod, the edge of the mounting plate is in limiting fit with the coil frame, the buffer plate is rotationally connected to the mounting plate, and the buffer plate is drivingly connected between the armature and the ejector rod.

[0012] Preferably, the edge of the mounting plate is provided with a clamping groove, the side edge of the coil frame away from the magnet is clamped in the clamping groove, and the edge of the mounting plate extends to form at least two pressing parts, one of the pressing parts abuts against the top plate of the coil frame, and the other pressing part cooperates with the two side edges of the armature.

[0013] Preferably, the driving mechanism further comprises a reset member, the two ends of the reset member are connected with the support member and the armature respectively, the shell comprises a bottom wall and a cover shell covering the bottom wall, the driving mechanism is fixed on the bottom wall, the driving hole is arranged on the cover shell, and the driving hole is spaced-apart from the bottom wall.

[0014] The utility model also provides a circuit breaker, including the shell, be provided with operating mechanism in the shell, still be provided with electromagnetic release as above in the shell, the ejector rod cooperates with operating mechanism.

[0015] The electromagnetic release and the circuit breaker have the positioning groove arranged on the coil frame, the magnet is limitedly assembled in the positioning groove, the coil frame and the magnet can form a modular structure, the assembly process is simplified, and assembly is facilitated.

[0016] In addition, the magnet is limited by the positioning groove and the abutting plate, the cooperation stability of the magnet and the coil frame can be ensured, the volume of the coil frame can be reduced, and the cost can be reduced.

[0017] Particularly, by increasing the width of the magnet, the contact surface of the magnet and the abutting plate is larger, thereby improving the fitting stability.

[0018] In addition, by setting the buffer assembly to buffer the impact force between the ejector rod and the armature, the performance reduction and failure are avoided, and at the same time, the buffer assembly cooperates with the limiting coil skeleton, thereby indirectly limiting the magnet.

[0019] Particularly, the mounting plate in the buffer assembly is limited to the coil skeleton and the armature by setting the clamping groove and the pressing portion, and has the advantages of simple structure and convenient cooperation. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of the electromagnetic release in the utility model;

[0021] Figure 2 is an exploded schematic diagram of the electromagnetic release in the utility model;

[0022] Figure 3 is a structural schematic diagram of the electromagnetic release removing the shell in the utility model;

[0023] Figure 4 is a structural schematic diagram of the electromagnetic release removing the shell and the reset member in the utility model;

[0024] Figure 5 is a structural schematic diagram of the driving mechanism and the buffer plate in the utility model;

[0025] Figure 6 is a structural schematic diagram of the buffer assembly in the utility model;

[0026] Figure 7 is a structural schematic diagram of the driving mechanism in the utility model (not containing the ejector rod);

[0027] Figure 8 is a structural schematic diagram of the driving mechanism removing the armature and the ejector rod in the utility model;

[0028] Figure 9 is a structural schematic diagram of the magnetic yoke, the coil skeleton, the magnet and the supporting member in the utility model;

[0029] Figure 10 is a structural schematic diagram of the coil skeleton in the utility model;

[0030] Figure 11 is a structural schematic diagram of the magnetic yoke in the utility model;

[0031] Figure 12 is a structural schematic diagram of the bottom plate in the utility model;

[0032] REFERENCE SIGNS:

[0033] 1 - housing, 10 - cover, 11 - top wall, 111 - driving hole, 12 - bottom wall, 121 - buckle, 2 - driving mechanism, 21 - coil former, 210 - coil shaft, 211 - top plate, 2111 - limiting plate, 2112 - positioning groove, 212 - bottom plate, 2121 - abutting plate, 213 - limiting part, 22 - magnetic yoke, 221 - first connecting arm, 222 - second connecting arm, 223 - fixing plate, 224 - attraction part, 23 - armature, 24 - magnet, 25 - reset member, 26 - supporting member, 3 - buffer assembly, 31 - mounting plate, 311 - clamping groove, 312 - pressing part, 32 - buffer plate, 4 - top rod. DETAILED DESCRIPTION

[0034] The specific embodiments of the electromagnetic release and circuit breaker of the utility model are further illustrated by the following examples combined with the drawings. The electromagnetic release and circuit breaker of the utility model are not limited to the description of the following examples.

[0035] As shown in the drawings, Figures 1-3 The electromagnetic release comprises a housing 1, the housing 1 is provided with a driving hole 111 on one side, a top rod 4 is slidingly assembled in the driving hole 111, a driving mechanism 2 is assembled in the housing 1, the driving mechanism 2 comprises a magnetic yoke 22, a coil assembly, an armature 23 and a magnet 24, the coil assembly comprises a coil former 21 and a coil wound on the outer side of the coil former 21, the armature 23 is rotationally assembled in the housing 1, the coil of the coil assembly is electrically connected with the magnetic yoke 22 to drive the armature 23 to act, the top rod 4 is driven by the armature 23 to slide in the driving hole 111, so that the top rod 4 extends out of the driving hole 111 or retracts into the driving hole 111, when the electromagnetic release is arranged in the circuit breaker, the top rod 4 triggers the operating mechanism to trip, the magnet 24 is arranged side by side with the coil assembly, the armature 23 is attracted by the magnet 24, so that the armature 23 and the magnetic yoke 22 keep the original state.

[0036] Usually, as shown in the drawings, Figures 3-5 The driving mechanism 2 further comprises a supporting member 26 and a reset member 25, the supporting member 26 is arranged in the housing 1, the magnetic yoke 22 is fixedly connected with the supporting member 26, the armature 23 is slidingly supported on the supporting member 26, and the two ends of the reset member 25 are connected with the armature 23 and the housing 1 respectively to reset the armature 23.

[0037] In addition, a buffer assembly 3 is further arranged in the housing 1, the buffer assembly 3 is arranged between the driving mechanism 2 and the top rod 4, and the buffer assembly 3 usually comprises a buffer plate 32, the buffer plate 32 is located between the armature 23 and the top rod 4, and the buffer plate 32 is drivingly connected between the armature 23 and the top rod 4, so that the impact between the top rod 4 and the armature 23 is buffered by the buffer plate 32, thereby avoiding the impact force between the top rod 4 and the armature 23.

[0038] As shown in the drawings, Figure 8The improvement of the present application is that the top plate 211 and / or the bottom plate 212 of the coil framework 21 is extended along the direction close to the magnet 24 to form a limiting plate 2111, the limiting plate 2111 is provided with a positioning groove 2112, one end of the magnet 24 is limitedly inserted into the positioning groove 2112, thus, by providing the positioning groove 2112 on the coil framework 21, the magnet 24 is limitedly assembled in the positioning groove 2112, so that the coil framework 21 and the magnet 24 can form a modular structure, which simplifies the assembly process and facilitates the assembly.

[0039] Specifically, the coil framework 21 includes a hollow coil shaft 210, a coil is wound outside the coil shaft 210, and the coil shaft 210 is provided with a top plate 211 and a bottom plate 212. The top plate 211 or the bottom plate 212 can be extended along the direction close to the magnet 24 to form a limiting plate 2111, and the limiting plate 2111 is provided with a positioning groove 2112. Therefore, only one end of the magnet 24 is limitedly inserted into the positioning groove 2112. Of course, the limiting plate 2111 can also be formed on the top plate 211 and the bottom plate 212, and each limiting plate 2111 is provided with a positioning groove 2112, so that both ends of the magnet 24 are limitedly inserted into the positioning groove 2112.

[0040] Preferably, the top plate 211 of the coil framework 21 is extended along the direction close to the magnet 24 to form a limiting plate 2111, one end of the magnet 24 is limitedly inserted into the positioning groove 2112, and the bottom plate 212 is extended along the direction close to the magnet 24 to form an abutting plate 2121, the abutting plate 2121 abuts against the other end of the magnet 24. Therefore, one end of the magnet 24 is limited by the positioning groove 2112, and the other end of the magnet 24 is limited by the abutting plate 2121, so that both ends of the magnet 24 are limited by the coil framework 21, which ensures the stability of the cooperation between the magnet 24 and the coil framework 21, and reduces the volume of the coil framework 21 and the cost.

[0041] Further, the buffer assembly 3 is provided between the driving mechanism 2 and the top rod 4, and the side of the buffer assembly 3 away from the top rod 4 is limitedly matched with the coil framework 21. Specifically, the buffer assembly 3 includes a mounting plate 31 and a buffer plate 32. The mounting plate 31 is located in the shell 1 between the driving mechanism 2 and the top rod 4, and the edge of the mounting plate 31 is limitedly matched with the coil framework 21. The buffer plate 32 is rotationally assembled on the mounting plate 31, and the buffer plate 32 is drivingly connected between the armature 23 and the top rod 4 for buffering the impact of the top rod 4 on the armature 23. The coil framework 21 is limited by the buffer assembly 3, thereby indirectly limiting the magnet 24, and improving the overall stability.

[0042] In combination Figures 1-12 A specific embodiment of an electromagnetic release is provided.

[0043] As Figure 1 , 2As shown, the electromagnetic tripping device comprises a shell 1, the shell 1 comprises a bottom wall 12 and a cover 10 covering the bottom wall 12, preferably, the cover 10 is connected with the bottom wall 12 by snap connection, which is convenient to disassemble, such as Figure 12 As shown, a pair of buckles 121 are arranged on the bottom wall 12, the buckles can be matched with the side wall of the cover 10 or the groove arranged on the cover 10; the driving mechanism 2 is fixed on the bottom wall 12, the side of the cover 10 opposite to the bottom wall 12 is used as a top wall 11, the middle part of the top wall 11 is provided with a driving hole 111, the top rod 4 is slidably arranged in the driving hole 111, the driving mechanism 2 is arranged in the shell 1, in the embodiment, the driving mechanism 2 is fixedly arranged on the bottom wall 12, the driving mechanism 2 comprises a magnetic yoke 22, a coil assembly, an armature 23, a support 26 and a magnet 24, the coil assembly comprises a coil framework 21, the coil is wound outside the coil framework 21, the middle part of the magnetic yoke 22 is fixed on the bottom wall 12, one end of the magnetic yoke 22 penetrates through the coil framework 21, the other end of the magnetic yoke 22 is fixed on the support 26 and is arranged in a spaced manner with the coil framework 21, the two ends of the magnetic yoke 22 are respectively used as two suction parts 224, the armature 23 is slidably arranged on the support 26, Figure 8 、 9 In the embodiment, the two suction parts 224 are in the same horizontal plane, the armature 23 is arranged in the horizontal direction, the moving direction of the armature 23 is close to or away from the suction parts 224, when the coil is powered, the magnetic field generated by the suction parts 224 can drive the armature 23; the magnet 24 is arranged in parallel with the coil assembly, in the embodiment, the magnet 24 is located between the coil framework 21 and the other end of the magnetic yoke 22, one end of the magnet 24 is used for resetting the armature 23, that is, after the coil loses power, the magnet 24 attracts the armature 23, so that the armature 23 keeps in contact with the two suction parts 224 of the magnetic yoke 22; further, the support 26 is connected with one end of the armature 23 with a reset member 25, the reset member 25 is a spring, the reset member 25 stores energy when the coil is powered and releases energy to reset the armature 23 after the coil loses power.

[0044] As shown Figures 8-10As shown, in the present embodiment, the coil former 21 comprises a hollow coil shaft 210, two ends of the coil shaft 210 are provided with a top plate 211 and a bottom plate 212, wherein the top plate 211 extends in the direction close to the magnet 24 to form a limiting plate 2111, the limiting plate 2111 is provided with a positioning groove 2112, the shape of the positioning groove 2112 matches the cross-sectional shape of the magnet 24, so that one end of the magnet 24 is limited to be inserted into the positioning groove 2112, in the present embodiment, the positioning groove 2112 is a rectangular groove, the magnet 24 is a cuboid, the bottom plate 212 extends in the direction close to the magnet 24 to form an abutting plate 2121, the abutting plate 2121 abuts against the other end of the magnet 24, the magnet 24 is limited by the top plate 211 and the bottom plate 212 of the coil former 21, which ensures the cooperation stability of the magnet 24 and the coil former 21, and at the same time, reduces the volume of the coil former 21 and saves the cost.

[0045] Further, the bottom plate 212 of the coil former 21 is further provided with a limiting portion 213, and the shell 1 is provided with at least one clamping portion, the limiting portion 213 and the clamping portion are limited and abutted against each other, in the present embodiment, the limiting portion 213 is a boss protruding on the bottom plate 212, the limiting portion 213 is located on the side of the bottom plate 212 away from the top plate 211, and is located away from the bottom plate 212, the clamping portion in the shell 1 is provided on the edge of the bottom wall 12, the edge of the bottom wall 12 forms a convex edge, and a groove serving as the clamping portion is provided on the convex edge, the groove is used for abutting and cooperating with the limiting portion 213, thereby further improving the assembly stability of the coil former 21 and avoiding excessive displacement of the coil former 21.

[0046] In the present embodiment, the magnetic yoke 22 adopts the prior art, such as Figures 7-9As shown in Figure 11, the magnetic yoke 22 includes two spaced-apart connecting arms, with a fixing plate 223 connecting between the two connecting arms, giving the magnetic yoke 22 an overall U-shaped structure. When the magnetic yoke 22 is placed inside the housing 1, the ends of the two connecting arms act as attracting parts 224 to engage with the armature 23. The fixing plate 223 and the armature 23 are spaced-apart and opposite to each other. Preferably, the magnetic yoke 22 is integrally formed by bending a straight plate structure. The outer diameters of the two connecting arms may not be exactly the same. The two connecting arms are divided into a first connecting arm 221 and a second connecting arm 222. The first connecting arm 221 passes through the middle of the coil frame 21, that is, the first connecting arm 221 is axial, which facilitates the movement of the coil from the coil frame. The hollow portion of 210 passes through, the second connecting arm 222 is a plate, and the second connecting arm 222 is fixedly connected to the support member 26; the base plate 212 of the coil frame 21 is located on the fixed plate 223, and the abutment plate 2121 extends along the surface of the fixed plate 223. The magnet 24, which is arranged side by side with the coil frame 21, is located on the fixed plate 223 and is limited by the coil frame 21. Furthermore, the width of one end of the magnet 24 is greater than the width of the fixed plate 223, and the width of the abutment plate 2121 is less than the width of the fixed plate 223. By increasing the width of the magnet 24, the abutment plate 2121 and the magnet 24 have a larger contact surface, thereby improving the stability of the fit.

[0047] Furthermore, in this embodiment, the armature 23 and the support member 26 also adopt existing technology, that is, the armature 23 has a plate-shaped structure, such as... Figures 3-5 As shown in 7-9, the support member 26 includes a vertical plate. One end of the vertical plate is provided with two legs, so that one end of the vertical plate forms a U-shaped groove. One end of the armature 23 is slidably supported in the U-shaped groove. The other end of the vertical plate is provided with a support plate fixed to the bottom wall 12. One end of the reset member 25 is connected to the support plate, and the other end is connected to the armature 23.

[0048] In this embodiment, as Figures 2-4 As shown in Figure 6, a buffer assembly 3 is also provided inside the housing 1. The buffer assembly 3 is located between the drive mechanism 2 and the push rod 4. The side of the buffer assembly 3 facing away from the push rod 4 is in a limiting cooperation with the coil frame 21. In this embodiment, the buffer assembly 3 includes a mounting plate 31 and a buffer plate 32. There are two mounting plates 31, which are arranged in the housing 1 at intervals and opposite to each other. The edge of the mounting plate 31 is used to abut against the coil frame 21, thereby further cooperating to limit the coil frame 21 within the housing 1. For example, a slot 311 and at least two pressing parts 312 are provided on the edge of the mounting plate 31. The edge of the coil frame 21 can be locked in the slot 311. One pressing part 312 abuts against the limiting plate 2111 of the coil frame 21, and the other pressing part 312 cooperates with the edge of the armature 23.

[0049] like Figures 2-4As shown in Figure 6, the mounting plate 31 is an approximately rectangular plate structure. One side of the mounting plate 31 has an arc-shaped groove to facilitate avoidance of protrusions within the housing 1. The other side of one end of the mounting plate 31 extends to form an extension area, creating a recessed avoidance area with the other side of the mounting plate 31. This avoidance area is spaced apart from the side of the drive mechanism 2 facing away from the bottom wall 12, allowing the armature 23 to move accordingly within the avoidance area. A slot 311 is provided on the side of the extension area closest to the avoidance area, engaging with the edge of the coil frame 21 away from the magnet 24. Three clamping parts 312 are provided on the edge of the avoidance area. Three clamping parts 312 are spaced apart. The two clamping parts 312 located on the side are rectangular bosses. Each clamping part 312 is used to abut against the top plate 211 of the coil frame 21, thereby limiting the coil frame 21 within the housing 1 between the mounting plate 31 and the bottom wall 12. The clamping part 312 located in the middle is an L-shaped boss, and the length of the L-shaped boss is slightly less than the length of the rectangular boss. The end of the L-shaped boss faces the other mounting plate 31, so that the end of the L-shaped boss engages with the two side edges of the armature 23, which can limit the movement trajectory of the armature 23 and prevent the armature 23 from generating unnecessary shaking between the two mounting plates 31.

[0050] like Figures 3-6 As shown, the buffer plate 32 can adopt existing technology. The buffer plate 32 is rotatably connected between the two mounting plates 31 and is also driven between the push rod 4 and the armature 23. Figure 5 The buffer plate 32 is horizontally positioned between the push rod 4 and the armature 23. One end of the buffer plate 32 is rotatably connected to the mounting plate 31. The push rod 4 corresponds to the middle of the buffer plate 32 or the rotating end away from the buffer plate 32. When the armature 23 is driven, the armature 23 pushes the buffer plate 32 to rotate, thereby driving the push rod 4 to extend out of the drive hole 111. When the push rod 4 is reset, the push rod 4 can reset the armature 23 through the buffer plate 32. Thus, the buffer plate 32 can buffer the impact force between the push rod 4 and the armature 23.

[0051] The circuit breaker includes a housing, and at least one circuit breaker pole is provided inside the housing. An operating mechanism is provided in at least one of the circuit breaker poles. The operating mechanism drives the contact mechanism in all circuit breaker poles to perform opening and closing operations. The circuit breaker pole, operating mechanism, and contact mechanism can adopt existing technology. An electromagnetic trip unit as described in the above embodiment is also provided inside the housing. The push rod 4 of the electromagnetic trip unit is used to trigger the operating mechanism to trip. When the drive mechanism 2 in the electromagnetic trip unit is activated, the push rod 4 extends from the drive hole 111 to trigger the operating mechanism to trip, causing the contact mechanism of the circuit breaker to open and disconnect the power.

[0052] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings or the orientation or positional relationship commonly used in use, and are only for the convenience of description, and do not indicate that the device or element referred to must have a particular orientation, so it cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating relative importance.

[0053] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, which should be considered as falling within the scope of protection of the present application.

Claims

1. Electromagnetic tripping device, comprising a housing (1) provided with a drive hole (111) in which a top rod (4) is slidingly fitted, and a drive mechanism (2) fitted in the housing (1), the drive mechanism (2) comprising a yoke (22), a coil assembly, an armature (23), a support (26) and a magnet (24), the armature (23) being slidingly fitted on the support (26), the yoke (22) cooperating with the coil assembly to drive the armature (23) to act in the housing (1), the top rod (4) being driven by the armature (23) to slide along the drive hole (111), the magnet (24) being arranged side by side with the coil assembly, characterized in that: The coil assembly comprises a coil framework (21), a top plate (211) and / or a bottom plate (212) of the coil framework (21) extends in a direction close to the magnet (24) to form a limiting plate (2111), the limiting plate (2111) is provided with a positioning groove (2112), one end of the magnet (24) is limitedly inserted into the positioning groove (2112).

2. The electromagnetic trip unit of claim 1, wherein: The coil framework (21) comprises a hollow coil shaft (210), two ends of the coil shaft (210) are provided with the top plate (211) and the bottom plate (212), the top plate (211) extends in a direction close to the magnet (24) to form the limiting plate (2111), the limiting plate (2111) is provided with the positioning groove (2112), one end of the magnet (24) is limitedly inserted into the positioning groove (2112), the bottom plate (212) extends in a direction close to the magnet (24) to form an abutting plate (2121), and the abutting plate (2121) abuts against the other end of the magnet (24).

3. The electromagnetic trip unit of claim 2, wherein: The bottom plate (212) of the coil framework (21) is further provided with a limiting portion (213), and the shell (1) is provided with at least one clamping portion, and the limiting portion (213) is limitedly abutted against the clamping portion.

4. The electromagnetic trip unit of claim 2, wherein: The magnetic yoke (22) comprises two spaced-apart connecting arms, a fixing plate (223) is connected between the two connecting arms, so that the magnetic yoke (22) has a U-shaped structure, one of the two connecting arms penetrates through the middle of the coil framework (21), so that the bottom plate (212) of the coil framework (21) is located on the fixing plate (223), the end faces of the two connecting arms away from the fixing plate (223) are attraction portions (224) and the armature (23) are spaced apart, the fixing plate (223) is fixed in the shell (1) and is opposite to the armature (23), one end of the magnet (24) is fixed on the fixing plate (223) between the two connecting arms, and the other end of the magnet (24) is opposite to the armature (23).

5. The electromagnetic trip unit of claim 4, wherein: The width of one end of the magnet (24) is greater than the width of the fixing plate (223), and the width of the abutting plate (2121) is less than the width of the fixing plate (223).

6. The electromagnetic trip unit of any of claims 2-5, wherein: The shell (1) is further provided with a buffer assembly (3), the buffer assembly (3) is located between the driving mechanism (2) and the top rod (4), and one side of the buffer assembly (3) away from the top rod (4) is limitedly matched with the coil framework (21).

7. The electromagnetic trip unit of claim 6, wherein: The buffer assembly (3) comprises a mounting plate (31) and a buffer plate (32), the mounting plate (31) is located in the shell (1) between the driving mechanism (2) and the top rod (4), an edge of the mounting plate (31) is limitedly matched with the coil framework (21), the buffer plate (32) is rotationally connected to the mounting plate (31), and the buffer plate (32) is drivingly connected between the armature (23) and the top rod (4).

8. The electromagnetic trip unit of claim 7, wherein: The edge of the mounting plate (31) is provided with a clamping groove (311), the coil former (21) is clamped in the clamping groove (311) away from the side edge of the magnet (24), and the edge of the mounting plate (31) extends to form at least two pressing portions (312), one of which abuts against the top plate (211) of the coil former (21), and the other one cooperates with the two side edges of the armature (23).

9. The electromagnetic trip unit of claim 1, wherein: The driving mechanism (2) further comprises a reset member (25), two ends of the reset member (25) are connected with the supporting member (26) and the armature (23) respectively; the shell (1) comprises a bottom wall (12) and a cover shell (10) covering the bottom wall (12), the driving mechanism (2) is fixed on the bottom wall (12), and the driving hole (111) is arranged on the cover shell (10) and is spaced from the bottom wall (12).

10. A circuit breaker comprising a housing in which is disposed an operating mechanism, characterised in that: The housing is further provided with the electromagnetic release as claimed in any one of claims 1-9, and the ejector rod (4) cooperates with the operating mechanism.

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