Miniature circuit breaker

Abstract

A transmission main body of an operating mechanism is formed by a handle, a connecting rod, a contact frame and a lock catch, the lock catch and the contact frame adopt a sleeve connection structure, and a lock catch reset torsion spring is arranged in a lock catch reset cavity and is linked with a lock catch reset part through a torsion spring notch. Meanwhile, the lock catch reset part of the contact frame is located in the receding groove of the lock catch, the reset reliability of the lock catch and the stability of connection between the lock catch and the contact frame are effectively guaranteed, the pull rod part of the lock catch can be directly linked with the thermal release, and on the basis that the number of parts of the operating mechanism and the complexity of connection of the parts are reduced, the operating efficiency is improved. According to the technical scheme, the small and medium-sized circuit breaker can generate obvious in-place feedback when the handle moves to the switching-on position, and the fluctuation range of the operating force is reduced in the switching-on movement process of the handle, so that the switching-on in-place sense definition is improved, the risk of poor contact caused by improper operation is reduced, and the service life of the small and medium-sized circuit breaker is prolonged. And the user experience is obviously improved.

Description

Technical Field

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

[0002] Miniature circuit breakers, also known as miniature circuit breakers, are widely used in industrial, commercial, and residential low-voltage power distribution applications due to their reliable performance, stable structure, and diverse appearance. They provide disconnection, overload protection, and short-circuit protection. The use of miniature circuit breakers can effectively improve the safety and reliable operation of electrical equipment, meeting the installation requirements of various electrical equipment.

[0003] Currently, there are many problems with small circuit breakers:

[0004] 1. The operating mechanism of a miniature circuit breaker requires multiple precision components (such as handles, trip latches, locks, connecting rods, brackets, and reset elastic members, etc.). The coordination between key components such as the trip latches, locks, and handles must be ingeniously designed and rigorously required. The existing operating mechanism is complex, resulting in multiple assembly steps and the need for skilled workers or precision automation equipment, which increases manufacturing costs and time.

[0005] 2. When operating the handle of the small circuit breaker to close the circuit, the closing stroke is not clear, and it is difficult for the operator to feel that the circuit breaker is closed. At the same time, some small circuit breakers on the market are too simplified in components, resulting in problems such as tripping and slipping during the opening and closing process of the small circuit breaker, which seriously affects the opening and closing stability of the small circuit breaker.

[0006] In view of this, there is an urgent need to design a miniature circuit breaker to solve the technical defects of the above-mentioned existing miniature circuit breakers. Utility Model Content

[0007] In order to solve the above problems, the utility model provides a small circuit breaker, comprising a shell and an operating mechanism, an electromagnetic release and a thermal release connected in the shell, the operating mechanism comprising a handle, a connecting rod, a contact frame and a lock; the contact frame comprises an action part, a rotating part and a linkage part, the rotating part is provided with a lock connecting column on the side facing the lock, a travel groove is provided on the action part, the travel groove is recessed downward near the handle to form a positioning groove, a moving contact is connected to one side of the linkage part, a lock reset part is provided on the other side of the linkage part, the lock comprises a main body, a sleeve part, a mounting part and a pull rod part, the sleeve part is connected to the lock connecting column, a lock reset cavity is provided on the outer periphery of the sleeve part, a lock reset torsion spring is connected in the lock reset cavity, and the lock reset cavity A lock limit part and a torsion spring notch are respectively provided on the upper and lower parts, one end of the lock reset torsion spring abuts on the lock and is located on the inner side of the lock limit part, and the other end of the lock reset torsion spring passes through the torsion spring notch and abuts on the lock reset part. A yield groove is provided on the main body part, and the lock reset part is located in the yield groove. The mounting part includes a mounting groove and a load-bearing edge, and a guide step is provided between the mounting groove and the load-bearing edge. One end of the connecting rod is connected to the handle, and the other end of the connecting rod is respectively connected to the action part and the mounting part. The main body part extends toward one side of the linkage part to form a tripping part, and the tripping part is located on the side of the linkage part close to the electromagnetic release. The linkage part is linked to the electromagnetic release, and the pull rod part is linked to the thermal release.

[0008] In one possible implementation, the connecting rod includes a rod body portion and a first transmission portion and a second transmission portion located at both ends of the rod body portion, the rod body portion is V-shaped, the first transmission portion is connected to the handle, and the second transmission portion is respectively connected to the action portion and the mounting portion.

[0009] In one possible implementation, when the circuit breaker is in a closed position, the first transmission part is located at the lower part of the handle, the second transmission part is connected to the bearing edge of the mounting part, and the second transmission part abuts against the inner wall of the positioning groove; when the circuit breaker is in an open position, the first transmission part is located at the upper part of the handle, the second transmission part is connected to the mounting groove of the mounting part, and the second transmission part does not abut against the inner wall of the positioning groove.

[0010] In one possible implementation, the pull rod portion includes an extension portion and a trigger portion connected to each other, the extension portion is connected to the main body portion, the trigger portion is located at the end of the extension portion, the thermal release is a bimetallic strip, the trigger portion and the bimetallic strip are in the same action plane, and the extension portion and the bimetallic strip are not in the same action plane.

[0011] In one possible implementation, a contact connecting column, a positioning portion and an anti-slip portion are provided on the side of the linkage portion away from the lock, the moving contact is connected to the contact connecting column, the moving contact is clamped between the linkage portion and the positioning portion, the moving contact is electrically connected to the bimetallic strip through a wire, a contact torsion spring is provided on the outer side of the contact connecting column, one end of the contact torsion spring abuts against the contact frame and is located on the inner side of the anti-slip portion, and the other end of the contact torsion spring abuts against the moving contact.

[0012] In a possible implementation, a blocking block is provided in the housing near the handle, the blocking block is opposite to the action portion, and when the circuit breaker is in an open state, the action portion abuts against the blocking block.

[0013] In one possible implementation, a frame connecting column is provided on the side of the rotating part away from the lock, the frame connecting column and the lock connecting column are coaxially arranged, a frame torsion spring is sleeved on the frame connecting column, a frame reset portion is provided on the outer periphery of the frame connecting column, one end of the frame torsion spring abuts against the frame reset portion, and the other end of the frame torsion spring abuts against the shell.

[0014] In one possible implementation, a contact slot for the moving contact to open and close is provided on the shell, a partition wall is provided on the outer periphery of the contact slot, an arc extinguishing cover is provided below the electromagnetic release, a flow channel rib is provided between the arc extinguishing cover and the contact slot, and an arc-shaped wide body portion is provided on the side of the linkage portion close to the contact slot, and the arc-shaped wide body portion is opposite to the contact slot.

[0015] In a possible implementation, a first exhaust flow channel and a second exhaust flow channel are provided in the shell, and both the first exhaust flow channel and the second exhaust flow channel are connected to the arc extinguishing cover.

[0016] In a possible implementation, the contact frame and the lock buckle are integrally formed.

[0017] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects:

[0018] The miniature circuit breaker of this technical solution uses a handle, a connecting rod, a contact frame and a lock to form the transmission body of the operating mechanism. The lock and the contact frame adopt a sleeve connection structure. The lock reset torsion spring is built into the lock reset cavity and is linked to the lock reset part through the torsion spring notch. At the same time, the lock reset part of the contact frame is located in the give way groove of the lock, which effectively ensures the reset reliability of the lock and the stability of the connection between the lock and the contact frame. The pull rod part of the lock can be directly linked to the thermal release. Compared with the existing circuit breaker, the stability of the opening and closing of the miniature circuit breaker is still guaranteed on the basis of simplifying the number of parts of the operating mechanism and the complexity of the part connection.

[0019] In this technical solution, one end of the lock reset torsion spring abuts against the inner side of the lock limit part, and the other end passes through the torsion spring notch and directly acts on the lock reset part, forming a double-acting torque. In the open state, the torsion spring pre-pressure makes the lock mounting part always fit the connecting rod, preventing accidental tripping or slipping due to vibration.

[0020] In this technical solution, when the handle of the small and medium-sized circuit breaker moves to the closed position, the connecting rod and the positioning slot form a mechanical limit, producing obvious in-position feedback. Moreover, during the closing movement of the handle, the connecting rod moves from the mounting slot to the load-bearing edge, passing through the guide step, and the fluctuation range of the operating force is reduced, thereby further improving the clarity of the closing position feeling, reducing the risk of poor contact due to inadequate operation, and significantly improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a three-dimensional diagram of a miniature circuit breaker according to an embodiment of the present utility model.

[0022] Figure 2 This is a schematic diagram of the internal structure of a miniature circuit breaker in an open state according to an embodiment of the utility model.

[0023] Figure 3 This is a schematic diagram of the internal structure of a miniature circuit breaker in a closed state according to an embodiment of the utility model.

[0024] Figure 4 This is an exploded view of the operating mechanism of an embodiment of the utility model.

[0025] Figure 5 This is a three-dimensional diagram of the operating mechanism of an embodiment of the present utility model.

[0026] Figure 6 This is a three-dimensional diagram of the contact frame and lock buckle according to an embodiment of the present utility model.

[0027] Figure 7 This is a three-dimensional diagram of the lock according to an embodiment of the present invention.

[0028] Figure 8 This is a three-dimensional diagram of the contact frame according to an embodiment of the present utility model.

[0029] Figure 9 This is another three-dimensional view of the contact frame according to an embodiment of the present invention.

[0030] Figure 10 This is a three-dimensional diagram of the housing of an embodiment of the present utility model.

[0031] Figure 11 This is another perspective view of a housing according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Combined with attachment Figure 1 To the attached Figure 11The technical solution of the present utility model is a miniature circuit breaker, comprising a housing 1 and an operating mechanism 2, an electromagnetic release 3 and a thermal release 4 connected to the housing 1. The operating mechanism 2 comprises a handle 21, a connecting rod 22, a contact frame 23 and a lock 24; the contact frame 23 comprises an action portion 231, a rotating portion 232 and a linkage portion 233. The rotating portion 232 is provided with a lock connection column 2321 on the side facing the lock 24. The action portion 231 is provided with a travel groove 2311, and the travel groove 2311 is close to the handle. A section of 21 is recessed downward to form a positioning groove 2312, one side of the linkage portion 233 is connected to the moving contact 25, and the other side of the linkage portion 233 is provided with a lock reset portion 234, the lock 24 includes a main body portion 241, a sleeve portion 242, a mounting portion 243 and a pull rod portion 244, the sleeve portion 242 is connected to the lock connecting column 2321, the outer periphery of the sleeve portion 242 is provided with a lock reset cavity 2421, the lock reset cavity 2421 is connected to a lock reset torsion spring 26, and the lock reset cavity 2421 is provided with a lock reset spring 26. A lock limit portion 2422 and a torsion spring notch 2423 are respectively provided. One end of the lock reset torsion spring 26 abuts against the lock 24 and is located on the inner side of the lock limit portion 2422. The other end of the lock reset torsion spring 26 passes through the torsion spring notch 2423 and abuts against the lock reset portion 234. A yield groove 2411 is opened on the main body 241, and the lock reset portion 234 is located in the yield groove 2411. The mounting portion 243 includes a mounting groove 2431 and a bearing edge 2432. The mounting groove 24 A guide step 2433 is provided between 31 and the bearing edge 2432, one end of the connecting rod 22 is connected to the handle 21, and the other end of the connecting rod 22 is respectively connected to the action part 231 and the mounting part 243, the main body 241 extends toward the side of the linkage part 233 to form a tripping part 245, and the tripping part 245 is located on the side of the linkage part 233 close to the electromagnetic release 3, the linkage part 233 is linked to the electromagnetic release 3, and the pull rod part 244 is linked to the thermal release 4.

[0034] In this embodiment, a connecting column for connecting the contact frame 23 and the lock 24 is provided inside the housing 1, so that the lock 24 and the contact frame 23 rotate inside the housing 1 with the connecting column as the axis, and the handle 21 is operated to drive the connecting rod 22 to pull the lock 24 and the contact frame 23 to close the circuit.

[0035] In this embodiment, the pull rod portion 244 is linked to the thermal release 4. When the small circuit breaker operates with overcurrent for a long time, the thermal release 4 drives the pull rod portion 244 to move, so that the tripping portion 245 of the lock 24 acts on the linkage portion 233, and the connecting rod 22 loses cooperation with the positioning groove 2312, completing the tripping and realizing the opening of the circuit breaker.

[0036] In this embodiment, when the miniature circuit breaker is short-circuited, the electromagnetic release 3 acts on the linkage portion 233 of the contact frame 23 to complete the tripping and realize the opening of the circuit breaker.

[0037] In this embodiment, the miniature circuit breaker is composed of a handle 21, a connecting rod 22, a contact frame 23 and a lock 24 to form the transmission body of the operating mechanism. The lock 24 and the contact frame 23 adopt a sleeve connection structure. The lock reset torsion spring 26 is built into the lock reset cavity 2421 and is linked to the lock reset portion 234 through the torsion spring notch 2423. At the same time, the lock reset portion 234 of the contact frame 23 is located in the give way groove 2411 of the lock 24, which effectively ensures the reset reliability of the lock 24 and the stability of the connection between the lock 24 and the contact frame 23. In addition, the pull rod portion 244 of the lock 24 can be directly linked to the thermal release 4. Compared with the existing circuit breaker, the stability of the opening and closing of the miniature circuit breaker is still guaranteed on the basis of simplifying the number of components of the operating mechanism and the complexity of the component connection.

[0038] In this embodiment, as shown in the attached Figure 4 As shown, the connecting rod 22 includes a rod body 221 and a first transmission part 222 and a second transmission part 223 located at both ends of the rod body 221. The rod body 221 is V-shaped, the first transmission part 222 is connected to the handle 21, and the second transmission part 223 is respectively connected to the action part 231 and the mounting part 243.

[0039] In this embodiment, as shown in the attached Figure 6 As shown, one end of the lock catch reset torsion spring 26 abuts the inner side of the lock catch limit portion 2422, while the other end passes through the torsion spring notch 2423 and directly acts on the lock catch reset portion 234, stably connecting the lock catch reset torsion spring 26 within the lock catch reset cavity 2421. In the open state, the torsion spring preload ensures that the mounting portion 243 of the lock catch 24 always fits against the connecting rod 22, preventing accidental tripping or slipping due to vibration. This torque ensures that the lock catch 24 is securely locked in the predetermined position when the circuit breaker is open. When the circuit breaker is closed, the lock catch 24 forms a correct fit with the contact frame 23 and the thermal release 4.

[0040] In this embodiment, as shown in the attached Figure 2 To the attached Figure 6As shown, when the circuit breaker is in the closed position, the first transmission part 222 is located at the lower part of the handle 21, the second transmission part 223 is connected to the bearing edge 2432 of the mounting part 243, and the second transmission part 223 abuts against the inner wall of the positioning groove 2312; when the circuit breaker is in the open position, the first transmission part 222 is located at the upper part of the handle 21, the second transmission part 223 is connected to the mounting groove 2431 of the mounting part 243, and the second transmission part 223 does not abut against the inner wall of the positioning groove 2312.

[0041] In this embodiment, the rod body 221 of the connecting rod 22 is V-shaped, and when the small circuit breaker is opened and closed, the first transmission part 222 is respectively located at the upper and lower parts of the handle 21, so that the operator applies a force in the direction of the contact frame 23 in the form of a push when closing the handle 21. When the handle of the small circuit breaker moves to the closed position, the connecting rod 22 and the positioning groove 2312 form a mechanical limit, generating obvious in-position feedback, and during the closing movement of the handle, the connecting rod 22 moves from the mounting groove 2431 to the load-bearing edge 2432, passing through the guide step 2433, and the operating force fluctuation range is reduced, thereby further improving the clarity of the closing sense, reducing the risk of poor contact due to inadequate operation, and significantly improving the user experience.

[0042] In this embodiment, as shown in the attached Figure 7 As shown, the pull rod portion 244 includes an extension portion 2441 and a trigger portion 2442 connected to each other, the extension portion 2441 is connected to the main body portion 241, and the trigger portion 2442 is located at the end of the extension portion 2441. The thermal release 4 is a bimetallic strip, and the trigger portion 2442 and the bimetallic strip are in the same action plane, and the extension portion 2441 and the bimetallic strip are not in the same action plane.

[0043] In this embodiment, as shown in the attached Figure 2 , Attachment Figure 3 and attached Figure 7 As shown, when the miniature circuit breaker is in the closed state, the trigger portion 2442 and the bimetallic strip are in the same action plane, that is, when the miniature circuit breaker is in overcurrent for a long time, causing the bimetallic strip to heat up and deform, the trigger portion 2442 will be pulled, thereby driving the lock 24 to rotate, so that the tripping portion 245 of the lock 24 acts on the linkage portion 233, thereby driving the contact frame 23 to move.

[0044] In this embodiment, as shown in the attached Figure 4 , Attachment Figure 8 and attached Figure 9As shown, the linkage portion 233 is provided with a contact connecting column 2331, a positioning portion 235 and an anti-slip portion 236 on the side away from the lock 24, the moving contact 25 is connected to the contact connecting column 2331, the moving contact 25 is clamped between the linkage portion 233 and the positioning portion 235, the moving contact 25 is electrically connected to the bimetallic strip through a wire, the outer side of the contact connecting column 2331 is provided with a contact torsion spring 27, one end of the contact torsion spring 27 abuts on the contact frame 23 and is located on the inner side of the anti-slip portion 236, the other end of the contact torsion spring 27 abuts on the moving contact 25, the contact torsion spring 27 provides an overtravel force to the moving contact 25, and ensures the reliability of the electrical connection between the moving contact 25 and the static contact.

[0045] In this embodiment, as shown in the attached Figure 10 As shown, a blocking block 11 is provided in the housing 1 near the handle 21, and the blocking block 11 is opposite to the action portion 231. When the circuit breaker is in the open state, the action portion 231 abuts against the blocking block 11. The blocking block 11 provides an opening limit function for the contact frame 23, ensuring the consistency of the positions of the contact frame 23 and the lock 24 after opening.

[0046] In this embodiment, as shown in the attached Figure 4 , Attachment Figure 5 and attached Figure 9 As shown, a frame connecting column 2322 is provided on the side of the rotating portion 232 away from the lock 24, and the frame connecting column 2322 is coaxially arranged with the lock connecting column 2321. A frame torsion spring 28 is sleeved on the frame connecting column 2322, and a frame reset portion 2323 is provided on the outer periphery of the frame connecting column 2322. One end of the frame torsion spring 28 abuts against the frame reset portion 2323, and the other end of the frame torsion spring 28 abuts against the shell 1.

[0047] In this embodiment, as shown in the attached Figure 10 and attached Figure 11 As shown, the shell 1 is provided with a contact slot 12 for the moving contact 25 to open and close, the outer periphery of the contact slot 12 is provided with a partition wall 13, an arc extinguishing cover 5 is provided below the electromagnetic release 3, a flow channel rib 14 is provided between the arc extinguishing cover 5 and the contact slot 12, and the linkage part 233 is provided with an arc-shaped wide body part 237 on the side close to the contact slot 12, and the arc-shaped wide body part 237 is opposite to the contact slot 12.

[0048] In this embodiment, as shown in the attached Figure 10 and attached Figure 11As shown, the housing 1 is formed by splicing two base shells, and the contact slot 12 is formed by splicing the partition wall 13 on the base shell; the arc-shaped wide body 237 of the contact frame 23 is opposite to the contact slot 12, so that the arc extinguishing gas will not move toward the operating mechanism when the miniature circuit breaker is disconnected.

[0049] In this embodiment, as shown in the attached Figure 10 and attached Figure 11 As shown, a first exhaust duct 15 and a second exhaust duct 16 are provided in the shell 1. The first exhaust duct 15 and the second exhaust duct 16 are both connected to the arc extinguishing cover 5. The first exhaust duct 15 and the second exhaust duct 16 are also formed by splicing two base shells.

[0050] In this embodiment, the contact frame 23 and the lock buckle 24 are integrally formed.

[0051] It should also be noted that, in this specification, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0052] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A miniature circuit breaker comprising a housing and an operating mechanism, an electromagnetic release and a thermal release connected in the housing, characterized in that: The operating mechanism includes a handle, a connecting rod, a contact frame and a lock; the contact frame includes an action part, a rotating part and a linkage part, the rotating part is provided with a lock connecting column on one side of the lock, the action part is provided with a travel groove, the travel groove is recessed downward near the handle to form a positioning groove, one side of the linkage part is connected to a moving contact, and the other side of the linkage part is provided with a lock reset part, the lock includes a main body, a sleeve part, a mounting part and a pull rod part, the sleeve part is connected to the lock connecting column, the outer periphery of the sleeve part is provided with a lock reset cavity, the lock reset torsion spring is connected in the lock reset cavity, the lock reset cavity is respectively provided with a lock limiting part and a torsion spring notch, one end of the lock reset torsion spring The cam is connected to the locking portion and is located on the inner side of the locking portion, and the other end of the locking portion reset torsion spring passes through the torsion spring notch and is connected to the locking portion reset part. A clearance groove is provided on the main body, and the locking portion reset part is located in the clearance groove. The mounting part includes a mounting groove and a load-bearing edge. A guide step is provided between the mounting groove and the load-bearing edge. One end of the connecting rod is connected to the handle, and the other end of the connecting rod is respectively connected to the action part and the mounting part. The main body extends toward one side of the linkage part to form a tripping part. The tripping part is located on the side of the linkage part close to the electromagnetic release. The linkage part is linked to the electromagnetic release, and the pull rod part is linked to the thermal release.

2. A miniature circuit breaker according to claim 1, characterized in that: The connecting rod includes a rod body and a first transmission part and a second transmission part located at both ends of the rod body. The rod body is V-shaped, the first transmission part is connected to the handle, and the second transmission part is respectively connected to the action part and the mounting part.

3. A miniature circuit breaker according to claim 2, characterized in that: When the circuit breaker is in a closed position, the first transmission part is located at the lower part of the handle, the second transmission part is connected to the bearing edge of the mounting part, and the second transmission part abuts against the inner wall of the positioning groove; when the circuit breaker is in an open position, the first transmission part is located at the upper part of the handle, the second transmission part is connected to the mounting groove of the mounting part, and the second transmission part does not abut against the inner wall of the positioning groove.

4. A miniature circuit breaker according to claim 1, characterized in that: The pull rod portion includes an extension portion and a trigger portion connected to each other, the extension portion is connected to the main body portion, the trigger portion is located at the end of the extension portion, the thermal release is a bimetallic strip, the trigger portion and the bimetallic strip are in the same action plane, and the extension portion and the bimetallic strip are not in the same action plane.

5. A miniature circuit breaker according to claim 4, characterized in that: A contact connecting column, a positioning portion and an anti-slip portion are provided on the side of the linkage portion away from the lock, the moving contact is connected to the contact connecting column, the moving contact is clamped between the linkage portion and the positioning portion, the moving contact is electrically connected to the bimetallic strip through a wire, a contact torsion spring is provided on the outer side of the contact connecting column, one end of the contact torsion spring abuts on the contact frame and is located on the inner side of the anti-slip portion, and the other end of the contact torsion spring abuts on the moving contact.

6. A miniature circuit breaker according to claim 1, characterized in that: A blocking block is provided in the housing near the handle, and the blocking block faces the action portion. When the circuit breaker is in an open state, the action portion abuts against the blocking block.

7. A miniature circuit breaker according to claim 1, characterized in that: A frame connecting column is provided on the side of the rotating part away from the lock, and the frame connecting column is coaxially arranged with the lock connecting column. A frame torsion spring is sleeved on the frame connecting column, and a frame reset portion is provided on the outer periphery of the frame connecting column. One end of the frame torsion spring abuts against the frame reset portion, and the other end of the frame torsion spring abuts against the shell.

8. A miniature circuit breaker according to any one of claims 1 to 7, characterized in that: The shell is provided with a contact slot for the moving contact to open and close, the outer periphery of the contact slot is provided with a partition wall, an arc extinguishing cover is provided below the electromagnetic release, flow channel ribs are provided between the arc extinguishing cover and the contact slot, and the linkage part is provided with an arc-shaped wide body on the side close to the contact slot, and the arc-shaped wide body is opposite to the contact slot.

9. A miniature circuit breaker according to claim 8, characterized in that: A first exhaust flow channel and a second exhaust flow channel are provided in the shell, and both the first exhaust flow channel and the second exhaust flow channel are communicated with the arc extinguishing cover.

10. A miniature circuit breaker according to any one of claims 1 to 7, characterized in that: The contact frame and the lock buckle are both integrally formed.

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