A three-position miniature circuit breaker

Abstract

This invention relates to the field of circuit breaker technology and discloses a three-position miniature circuit breaker, comprising: a bracket, a main housing fixedly connected to one side of the bracket, a closing / opening button on the outside of the main housing, a limiting frame fixedly connected to the top of the main housing, a torsion rod inside the limiting frame, multiple upper transmission arms on the outside of the torsion rod, and three vacuum interrupters located in front of the bracket, with fuses fixedly connected to the outside of the vacuum interrupters. This invention utilizes the rotation of the opening operating shaft in conjunction with a swinging component. As the swinging component rotates, it slides along the top of a ball. During rotation, the ball gradually inserts into the interior of the swinging component and is positioned inside a deep hole, producing a clicking sound. At this point, external personnel understand that the operation is complete and the closing is finished. This automatic feedback function ensures that the circuit is not in a critical state and is in a completely safe isolation state, thereby improving safety performance.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, specifically to a three-position miniature circuit breaker. Background Technology

[0002] As a widely used circuit protection device, miniature circuit breakers typically require two basic operating positions: connecting and disconnecting the circuit. They integrate overload and short-circuit protection functions. To provide a safer and more reliable isolation state and prevent the risk of accidental closing, miniature circuit breakers with three positions are often installed in applications requiring a higher level of safety. These positions mainly consist of closing, opening, and isolation. The isolation position ensures that there is a visible and safe separation distance between the moving and stationary contacts. This is generally achieved by setting up mechanical interlocks to prevent misoperation. However, some common problems still exist in practical applications.

[0003] For example, the core function of the isolation station is to ensure safety. However, some existing three-position circuit breaker products may be in a critical state in terms of key safety indicators such as contact distance and insulation performance after being switched to the isolation position. When subjected to unexpected external forces or vibrations, they may be displaced and cannot be absolutely guaranteed to be in an isolated state, which may bring potential electric shock hazards to maintenance personnel. Therefore, they are not conducive to safe use. Summary of the Invention

[0004] This invention provides a three-position miniature circuit breaker, which mainly uses the rotational power of the operating handle through an integrated mechanical transmission system to ensure a safe distance guaranteed by the mechanical structure in the isolation position, as well as a clear operating feel, thus solving the problem of safety indicators being in a critical state.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0006] Firstly, a three-position miniature circuit breaker includes: a bracket, a main housing fixedly connected to one side of the bracket, a closing / opening button on the outside of the main housing, a limiting frame fixedly connected to the top of the main housing, a torsion rod inside the limiting frame, multiple upper drive arms on the outside of the torsion rod, three vacuum interrupters located at the front of the bracket, fuses fixedly connected to the outside of the vacuum interrupters, a grounding switch below the fuses, retaining bars on the inner sides of the multiple upper drive arms, disconnecting switches at the top of the retaining bars, and a opening operating shaft inside the main housing; further comprising:

[0007] The closing section, located inside the main housing, is used to drive the torsion rod to perform the closing operation.

[0008] The closing section includes a converter and an isolator. The converter is installed on the outside of the opening operation shaft. The converter and the isolator are connected. The isolator is located on the outside of the torsion bar.

[0009] The feedback unit is located on the outside of the tripping operation shaft and is used to provide feedback on critical states that occur during rotation.

[0010] The feedback unit includes a plug-in component and a deep / shallow component. The plug-in component is disposed on the inner wall of the main housing. The plug-in component and the deep / shallow component are connected. The deep / shallow component is disposed on the outer side of the tripping operation shaft.

[0011] The circuit breaker section is located below the bracket and on one side of the grounding switch;

[0012] The circuit breaker includes a support frame and a grounding component. The support frame is located below the vacuum interrupter chamber. The support frame and the grounding component are connected. The grounding component is located inside the grounding switch.

[0013] Furthermore, the adapter includes:

[0014] The tripping operation shaft is located on the inner wall of the main housing and below the main housing, and is used to drive the closing operation.

[0015] The spring operating lever is located on one side of the main housing and above the main housing;

[0016] The linkage rod is fitted onto the outside of the tripping operating shaft at one end and onto the outside of the spring operating rod at the other end.

[0017] The closing spring is sleeved on the outside of the linkage bar.

[0018] Furthermore, the isolation element includes:

[0019] The linkage rod is fixed at one end to the outside of the spring operating rod and at the other end to the outside of the torsion rod;

[0020] The linkage is located between the vacuum interrupter and the main housing.

[0021] Furthermore, the connector includes:

[0022] The guide shell is located on the inner wall of the main housing;

[0023] The telescopic spring is located inside the guide housing;

[0024] Furthermore, the connector also includes:

[0025] A sphere is fixedly installed on the top of the telescopic spring;

[0026] An opening is provided at one end of the guide shell.

[0027] Furthermore, the deep and shallow components include:

[0028] The swing element is fixedly sleeved on the opening operation shaft and rotates synchronously with it.

[0029] A ramp surface is provided on one side of the swing component;

[0030] A deep hole is formed on the upper side of the oscillating component;

[0031] A medium-deep hole is formed in the middle of the side of the oscillating component;

[0032] Shallow holes are formed on the lower side of the oscillating component;

[0033] Damping components, located on one side of the oscillating component, are used to provide tactile feedback and operational damping.

[0034] Furthermore, the damping component includes:

[0035] A thin strip is positioned on one side of the oscillating component;

[0036] The identification plate is fixedly installed at the top of the thin strip and connected to the tripping operation shaft;

[0037] There are three identification blocks, each installed on one side of the identification plate.

[0038] Furthermore, the damping component also includes:

[0039] A tension spring is installed on the inside of the marker block;

[0040] The gravity block is positioned below the tension spring;

[0041] The friction damping block is set on the side of the gravity block.

[0042] Furthermore, the support frame includes:

[0043] An insulating support rod is installed below the vacuum interrupter;

[0044] The drive pin is located on one side of the insulating support rod;

[0045] The Z-type transmission arm is located on the outside of the tripping operation shaft;

[0046] The spring-operated main rod is located at the top of the Z-shaped transmission arm.

[0047] Furthermore, the grounding element includes:

[0048] The main tripping rod has one end hinged to the grounding switch.

[0049] The linkage spring is sleeved on the outside or one side of the tripping main rod;

[0050] The torsion block is fixedly mounted on the rotating shaft;

[0051] The rotating shaft is rotatably mounted inside the main housing.

[0052] The above-described solution of the present invention has at least the following beneficial effects:

[0053] The tripping operation shaft rotates in conjunction with the swing mechanism. As the swing mechanism rotates, it slides along the top of the ball. When rotating, the ball gradually inserts into the interior of the swing mechanism and is located inside the deep hole, producing a clicking sound. At this point, the external personnel understand that the operation is in place and the circuit breaker is closed. It has an automatic feedback function to ensure that this is not a critical state and is a completely safe isolation state, thereby improving safety performance. It ensures that a safe distance guaranteed by the mechanical structure and a clear operating feel can be obtained at the isolation station, avoiding the situation where safety indicators are at a critical state. Attached Figure Description

[0054] The invention will now be further described with reference to the accompanying drawings.

[0055] Figure 1 This is a schematic diagram of the overall three-dimensional structure provided in an embodiment of the present invention;

[0056] Figure 2 A three-dimensional exploded view of the combination of spring operating lever, upper transmission arm, and limiting frame is provided for an embodiment of the present invention;

[0057] Figure 3 An exploded perspective view of the combination of linkage rod, closing spring, and torsion bar for embodiments of the present invention is provided;

[0058] Figure 4 This is provided by the embodiments of the present invention. Figure 3 Enlarged schematic diagram of the local structure at point C;

[0059] Figure 5 This is a schematic diagram of the combined structure of the spring-operated main rod, Z-shaped transmission wall, and tripping operation shaft provided in an embodiment of the present invention;

[0060] Figure 6 This is provided by the embodiments of the present invention. Figure 5 Enlarged schematic diagram of a local structure at point A;

[0061] Figure 7 This is provided by the embodiments of the present invention. Figure 5 A magnified view of the local structure at point E in the middle;

[0062] Figure 8 This is an exploded view of the structural combination of the identifier block, the identification disk, and the friction damping block provided in an embodiment of the present invention.

[0063] In the diagram: 1. Bracket; 2. Main housing; 3. Closing / opening button; 4. Limiting frame; 5. Torsion rod; 6. Upper transmission arm; 7. Vacuum interrupter; 8. Fuse; 9. Grounding switch; 10. Locking bar; 11. Disconnecting switch; 12. Opening operating shaft; 13. Linkage pull bar; 14. Closing spring; 15. Spring operating rod; 16. Linkage rod; 161. Swinging component; 162. Deep hole; 163. Medium-deep hole; 1 64. Shallow hole; 17. Guide shell; 18. Telescopic spring; 19. Sphere; 20. Thin strip; 21. Identification plate; 22. Identifier block; 24. Gravity block; 25. Friction damping block; 26. Tension spring; 28. Drive pin; 30. Z-shaped transmission arm; 31. Spring operating main rod; 32. Opening main rod; 33. Insulating support rod; 34. Linkage spring; 35. Torsion block; 36. Sloping surface; 37. Rotating shaft. Detailed Implementation

[0064] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0065] like Figures 1 to 8 As shown, a three-position miniature circuit breaker includes: a bracket 1, a main housing 2 fixedly connected to one side of the bracket 1, a closing / opening button 3 disposed on the outside of the main housing 2, a limiting frame 4 fixedly connected to the top of the main housing 2, a torsion rod 5 disposed inside the limiting frame 4, multiple upper transmission arms 6 disposed on the outside of the torsion rod 5, three vacuum interrupters 7 disposed in front of the bracket 1, fuses 8 fixedly connected to the outside of the vacuum interrupters 7, a grounding switch 9 disposed below the fuses 8, retaining strips 10 disposed on the inner sides of the multiple upper transmission arms 6, a disconnecting switch 11 disposed at the top of the retaining strips 10, and a opening operating shaft 12 disposed inside the main housing 2, and further includes:

[0066] The closing section is located inside the main housing 2 and is used to drive the torsion rod 5 to perform the closing operation.

[0067] The closing part includes a converter and an isolator. The converter is installed on the outside of the opening operation shaft 12. The converter and the isolator are connected. The isolator is located on the outside of the torsion rod 5.

[0068] The feedback unit is located on the outside of the tripping operation shaft 12 and is used to provide feedback on the critical state that occurs during rotation.

[0069] The feedback unit includes a plug and a deep / shallow component. The plug is disposed on the inner wall of the main housing 2. The plug and the deep / shallow component are connected. The deep / shallow component is disposed on the outer side of the tripping operation shaft 12.

[0070] The circuit breaker section is located below the bracket 1 and on one side of the grounding switch 9;

[0071] The circuit breaker includes a support frame and a grounding component. The support frame is located below the vacuum interrupter 7 and is connected to the grounding component. The grounding component is located inside the grounding switch 9.

[0072] Specifically, one side of the main housing 2 is provided with a disconnect switch display screen, a lock hole, and two handle sockets for closing, opening, and isolating the equipment; the top of the opening operation shaft 12 is provided with a through hole to facilitate the two handles to be passed through and rotated forcefully; a fuse trigger rod is provided below the fuse 8, one end of the trigger rod contacts the fuse holder of the fuse, and the other end extends to the swing member outside the opening operation shaft 12, which is a prior art and will not be described in detail.

[0073] In the specific implementation process, when it is necessary to close the circuit breaker, insert the external handle tool into the socket of the aligning trip operation shaft 12 on one side of the main housing 2, turn the handle counterclockwise half a turn, the trip operation shaft 12 swings, and the twisting power closes the upper disconnect switch 11, forming a protective function.

[0074] When it is necessary to separate the grounding switch, insert it downwards in the direction of the rotating shaft 37, and then twist it. The twisting of the rotating shaft 37 will twist the tripping main rod 32 onto the grounding switch 9, thereby forming the tripping.

[0075] like Figures 1 to 3 As shown, the adapter includes:

[0076] The tripping operation shaft 12 is located on the inner wall of the main housing 2 and below the main housing 2, and is used to drive the closing operation.

[0077] The spring operating lever 15 is located on one side of the main housing 2 and above the main housing 2;

[0078] The linkage rod 13 is sleeved on the outside of the tripping operation shaft 12 at one end and on the outside of the spring operating rod 15 at the other end.

[0079] The closing spring 14 is sleeved on the outside of the linkage bar 13.

[0080] The isolation element includes:

[0081] The linkage 16 is fixed at one end to the outside of the spring operating lever 15 and at the other end to the outside of the torsion lever 5;

[0082] The linkage 16 is located between the vacuum interrupter 7 and the main housing 2.

[0083] Specifically, the tripping operating shaft 12 is used to open and close the upper isolation section; the linkage rod 13 and the closing spring 14 are assembled as a whole, facilitating timely adjustment of the vertical distance; an insulating base is provided on the top of the vacuum interrupter 7; and the spring operating rod 15...

[0084] When the tripping operation shaft 12 rotates, it will twist the linkage pull bar 13 downward, causing the spring operating rod 15 to twist. The deflection of the spring operating rod 15 will drive the connecting rod 16 to swing. The connecting rod 16 will drive the torsion rod 5 to twist. The upper transmission arm 6 moves together with the torsion rod 5. The upper transmission arm 6 presses down on one end of the clamping bar 10, and the other end of the clamping bar 10 lifts up. The other end drives the disconnecting switch 11 to move closer to the insulating base at the top of the vacuum interrupter 7. When they move closer, the disconnecting switch 11 closes, thus completing the isolation function.

[0085] like Figures 4 to 6 As shown, the connector includes:

[0086] The guide shell 17 is disposed on the inner wall of the main housing 2;

[0087] The telescopic spring 18 is disposed inside the guide housing 17;

[0088] The connector also includes:

[0089] The ball 19 is fixedly installed on the top of the telescopic spring 18;

[0090] One end of the guide shell 17 is provided with an opening;

[0091] The deep and shallow components include:

[0092] The swing element 161 is fixedly sleeved on the tripping operation shaft 12 and rotates synchronously with the tripping operation shaft 12.

[0093] Sloping surface 36 is provided on one side of the swing member 161;

[0094] A deep hole 162 is formed on the upper side of the swing member 161;

[0095] A medium-deep hole 163 is formed in the middle of the side of the swing member 161;

[0096] A shallow hole 164 is formed on the lower side of the swing member 161;

[0097] A damping component, located on one side of the oscillating member 161, is used to provide tactile feedback and operational damping.

[0098] Specifically, the guide shell 17 is made of stainless steel and its size is only slightly larger than the diameter of the deep hole 162, so it will not occupy too much space inside the main housing 2; the ball 19 is the same size as the top of the closing spring 14 and is adapted to the open end on one side of the guide shell 17; the ball 19 is pressed against the outside of the swing member 161 by default and synchronously fits the swing member 161 as it rotates; the deep hole 162, the medium-deep hole 163, and the shallow hole 164 have the same diameter and represent the isolation position, the closing position, and the opening position, respectively.

[0099] In practical application, the tripping operation shaft 12 is rotated first. After the tripping operation shaft 12 rotates, it drives the swing member 161 to move. When the swing member 161 rotates, it slides along the top of the ball 19. When rotating, the ball 19 gradually inserts into the interior of the swing member 161 and is located inside the deep hole 163, and a clicking sound is formed. At this time, the external staff understand that the operation is in place and the closing is completed. It has an automatic feedback function.

[0100] When isolation is required, the oscillating component 161 is twisted to rotate and change its position. After the position changes, the ball 19 that was originally inside the deep hole 163 comes out and reaches the position of the deep hole 162, which will produce a more obvious crisp sound, so that people can more clearly understand the working degree and the isolation position.

[0101] When the circuit breaker needs to be tripped, it will slide out through the outside of the swing member 161 and enter the interior of the shallow hole 164.

[0102] like Figures 5 to 6 As shown, the damping component includes:

[0103] A thin strip 20 is disposed on one side of the swing member 161;

[0104] The identification plate 21 is fixedly installed at the top of the thin strip 20 and connected to the tripping operation shaft 12;

[0105] There are three identification blocks 22, which are radially installed around the periphery of the identification plate 21 via slots or screws. Each block has a cavity on its inner side and is installed on one side of the identification plate 21.

[0106] The damping component also includes:

[0107] A tension spring 26 is disposed inside the marking block 22, and its upper end is fixed to the inner top wall of the cavity of the marking block 22.

[0108] Gravity block 24 is positioned below tension spring 26 and can swing within the cavity;

[0109] The friction damping block 25 is disposed on the side of the gravity block 24 and is fixed to the outer surface of the gravity block 24 by means of insert molding.

[0110] Specifically, the thin strip 20 is used to support the marker block 22; the gravity block 24 facilitates the adjustment of the internal texture; the friction damping block 25 is located below the marker block 22; the identification plate 21 is fixedly connected to the thin strip 20; the identification plate 21 is arc-shaped; the tension spring 26 is used to support the gravity block 24; an observation window and status bar are provided on the status bar on one side of the main housing 2; the friction damping block 25 is set on the inner wall of the gravity block 24; the preset fixed friction surface on the inner wall of the main housing 2 is... Figure 5 The side with the dotted line in the middle, the fixed friction surface is a flat arc-shaped area or planar area on the inner wall of the main housing 2 that corresponds to the movement trajectory of the friction damping block 25;

[0111] In practical applications, traditional equipment cannot distinguish between circuit breaker and isolation by touch alone, and the indicator may not match the actual internal state. When the swinging part 161 rotates, it will drive the thin strip 20 to move synchronously. The rotation of the thin strip 20 will drive the identification plate 21 to work. When the identification plate 21 twists, it will gradually display the present state on the status bar on one side of the main box 2, and the situation can be obtained through the observation window.

[0112] Meanwhile, when the thin strip 20 rotates, it will drive the gravity block 24 to move. When the operating speed is too fast, the gravity block 24, due to centrifugal force, will press the friction damping block 25 tightly against the preset fixed friction surface on the inner wall of the main box 2, thereby generating a huge frictional resistance torque. This resistance torque automatically counteracts the violent operation of the operator, forcing the operator to slow down. At low speed, the ball 19 can fall more smoothly into the deep hole 162, medium-deep hole 163 or shallow hole 164, which not only protects the mechanism from impact, but also ensures clear gear feel.

[0113] like Figures 3 to 5 As shown: The support frame includes:

[0114] Insulating support rod 33 is installed below vacuum interrupter 7;

[0115] Drive pin 28 is located on one side of insulating support rod 33;

[0116] Z-type transmission arm 30 is located on the outside of the tripping operation shaft 12;

[0117] The spring-operated main rod 31 is located at the top of the Z-shaped transmission arm 30.

[0118] The grounding element includes:

[0119] The main tripping rod 32 has one end hinged to the grounding switch 9;

[0120] The linkage spring 34 is sleeved on the outside or one side of the tripping main rod 32;

[0121] The torsion block 35 is fixedly installed on the rotating shaft 37;

[0122] The rotating shaft 37 is rotatably disposed inside the main housing 2;

[0123] The torsion block 35 is in contact with or hinged to the other end of the tripping main rod 32, so that when the rotating shaft 37 rotates, it can push the tripping main rod 32 through the torsion block 35, compress the linkage spring 34, and then drive the grounding knife 9 to complete the closing or opening action.

[0124] Specifically, the insulating support rod 33 is installed inside the vacuum interrupter 7; the drive pin 28 is screwed onto one side of the insulating support rod 33 by means of a threaded connection; the tripping main rod 32 passes through one side of the main housing 2 through the rotating shaft 37; the torsion block 35 is fixedly installed on the outer surface of the rotating shaft 37; the swing member 161 is not only used for feedback positioning, but also has a ramp surface 36 on its side, and the end of the drive pin 28 abuts against this ramp surface 36;

[0125] In practical applications, when grounding is required, the handle is inserted and aligned with the socket of the rotating shaft 37. Rotating the handle drives the rotating shaft 37 to rotate, which in turn drives the torsion block 35 fixed thereon to rotate. The torsion block 35 pushes one end of the tripping main rod 32, compressing the linkage spring 34, causing it to overcome the elastic force of the linkage spring 34 and move axially. The other end of the tripping main rod 32 pulls the grounding knife 9 around its axis through a hinge, causing the tripping main rod 32 to move towards the grounding knife 9, ultimately achieving reliable grounding. At the same time, the rotation of the tripping operation shaft 12 drives the Z-shaped transmission arm 30 to swing. The Z-shaped transmission arm 30 drives the spring-operated main rod 31 to move, compressing the spring inside or associated with it. This provides additional power for the grounding operation and also plays a positioning role through mechanical limiting.

[0126] When the handle is switched from the open position to the isolated position, the ramp surface 36 on the swing member 161 that rotates with the open operation shaft 12 begins to contact and forcefully push the drive pin 28. The drive pin 28 transmits the thrust through the insulating support rod 33 to the moving contact support, pushing the moving contact backward by an additional, defined mechanical forced distance, thereby unconditionally ensuring the safe isolation distance.

[0127] Working principle: First, insert the operating handle and align it with the tripping operating shaft 12. Rotate the handle counterclockwise to drive the tripping operating shaft 12 to rotate. The rotation of the tripping operating shaft 12, through the coordinated action of the linkage pull bar 13 and the closing spring 14, converts the rotational motion into linear pulling, which in turn drives the spring operating rod 15 to twist. The torque of the spring operating rod 15 is transmitted to the torsion rod 5 through the linkage rod 16, ultimately driving the upper transmission arm 6 to move downward.

[0128] The upper transmission arm 6 presses down one end of the clamping bar 10, and uses the lever principle to make its other end tilt up, pushing the disconnecting switch 11 to approach and make close contact with the insulating base at the top of the vacuum interrupter 7, thereby completing the closing and connecting the circuit;

[0129] As the tripping operation shaft 12 rotates, the swing member 161 fixed thereon rotates synchronously. Under the preload of the telescopic spring 18, the ball 19 always slides in close contact with the outer surface of the swing member 161;

[0130] During the critical state feedback process, when the ball 19 is rotated to the critical position such as closing, isolating, or opening, it will fall precisely into the corresponding deep hole 162, medium-deep hole 163, or shallow hole 164 on the swing element 161, accompanied by a clear clicking sound, and a noticeable tactile feedback will be felt in the hand. This provides the operator with indisputable tactile and audible confirmation of the gear position;

[0131] During status indication and anti-violent operation:

[0132] The swing component 161 drives the identification plate 21 and the identification block 22 to rotate through the thin strip 20, displaying the actual internal workstation status on the observation window of the main box 2, thus realizing status visualization;

[0133] When the operating speed is too fast, the gravity block 24 swings due to centrifugal force or inertia, pressing the friction damping block 25 against the fixed friction surface of the inner wall of the main box 2, generating a huge resistance torque, which forces the operator to slow down. This mechanism effectively prevents the impact of violent operation on the mechanism and ensures that the ball 19 can fall into the hole smoothly and accurately, ensuring the clear sense of gear position and the service life of the mechanism.

[0134] Insert the handle downwards and align it with the rotating shaft 37. Rotating the handle drives the rotating shaft 37 and the torsion block 35 fixed thereon to rotate. The torsion block 35 pushes the tripping main rod 32 to overcome the force of the linkage spring 34 and move towards the grounding switch 9, ultimately achieving reliable grounding and completing the tripping.

[0135] When switching from the open position to the isolated position is required, the operating handle drives the open operating shaft 12 and the swing member 161 to continue rotating. At this time, the ramp surface 36 on the swing member 161 begins to contact and forcibly push the drive pin 28. The drive pin 28 transmits the thrust to the moving contact support through the insulating support rod 33, pushing the moving contact backward a certain distance. Through the closing section, feedback section and opening section, mechanical linkage is achieved through the core components such as the open operating shaft 12 and the swing member 161, ensuring the synchronization and consistency of all actions. This constitutes a safe three-position miniature circuit breaker that integrates mechanical forced isolation, tactile and audible feedback, visual status indication and operating force damping protection.

[0136] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A three-position miniature circuit breaker, comprising: Support (1), one side of the support (1) is fixedly connected with a main box (2), the outer side of the main box (2) is provided with a closing and opening button (3), the top of the main box (2) is fixedly connected with a limiting frame (4), the inside of the limiting frame (4) is provided with a twist lever (5), the outside of the twist lever (5) is provided with a plurality of upper driving arms (6), the front of the support (1) is provided with three vacuum interrupters (7), the outside of the vacuum interrupter (7) is fixedly connected with a fuse (8), the lower side of the fuse (8) is provided with a grounding knife (9), the inside of a plurality of the upper driving arms (6) is provided with a clamping strip (10), the top of the clamping strip (10) is provided with a disconnecting switch (11), the inside of the main box (2) is provided with an opening operation shaft (12), characterized by further comprising: The closing part is arranged in the main box (2), and is used for driving the twist lever (5) to close; The closing part comprises a switching piece and an isolation piece, the switching piece is arranged on the outside of the opening operation shaft (12), the switching piece and the isolation piece are connected, and the isolation piece is arranged on the outside of the twist lever (5); The feedback part is arranged on the outside of the opening operation shaft (12), and is used for the critical state appearing when rotating; The feedback part comprises a plug-in piece and a depth piece, the plug-in piece is arranged on the inner wall of the main box (2), the plug-in piece and the depth piece are connected, and the depth piece is arranged on the outside of the opening operation shaft (12); The opening part is arranged below the support (1) and on one side of the grounding knife (9); The opening part comprises a supporting frame and a grounding piece, the supporting frame is arranged below the vacuum interrupter (7), the supporting frame and the grounding piece are connected, and the grounding piece is arranged on the inside of the grounding knife (9); The switching piece comprises: The opening operation shaft (12) is arranged on the inner wall of the main box (2) and below the main box (2); The spring operating rod (15) is arranged on one side of the main box (2); The linkage stay (13) is sleeved on the outside of the opening operation shaft (12) at one end and is sleeved on the outside of the spring operating rod (15) at the other end; The closing spring (14) is sleeved on the outside of the linkage stay (13); The isolation piece comprises: The linkage rod (16) is fixed on the outside of the spring operating rod (15) at one end and is fixed on the outside of the twist lever (5) at the other end; The linkage rod (16) is located between the vacuum interrupter (7) and the main box (2); The plug-in piece comprises: The guide shell (17) is arranged on the inner wall of the main box (2); The extension spring (18) is arranged in the guide shell (17); The ball (19) is fixedly installed on the top of the extension spring (18); One end of the guide shell (17) is provided with an opening.

2. A three-position small circuit breaker according to claim 1, characterized in that: The depth piece comprises: The swing piece (161) is fixedly sleeved on the opening operation shaft (12); The inclined surface (36) is arranged on one side of the swing piece (161); The deep hole (162) is arranged on the side surface of the swing piece (161).

3. A three-position small circuit breaker according to claim 2, characterized in that: The depth piece comprises: The medium deep hole (163) is arranged on the side surface of the swing piece (161) and below the deep hole (162). A shallow hole (164) is arranged on the side of the swing member (161) and below the shallow hole (164); A damping part is arranged on one side of the swing member (161) to provide tactile feedback and operation damping.

4. A three-position small circuit breaker according to claim 3, characterized in that: The damping part comprises: A thin strip (20) is arranged on one side of the swing member (161); A distinguishing disc (21) is fixedly installed on the top end of the thin strip (20) and connected with the opening operation shaft (12); Three identification blocks (22) are evenly installed on one side of the distinguishing disc (21).

5. A three-position small circuit breaker according to claim 4, characterized in that: The damping part further comprises: A tension spring (26) is arranged on the inner side of the identification block (22); A gravity block (24) is arranged below the tension spring (26); A friction damping block (25) is arranged on the side of the gravity block (24).

6. The triple-pole small-sized circuit breaker according to claim 1, characterized in that: The support frame comprises: An insulating support rod (33) is arranged below the vacuum arc-extinguishing chamber (7); A driving pin (28) is arranged on one side of the insulating support rod (33); A Z-shaped transmission arm (30) is arranged on the outer side of the opening operation shaft (12); A spring operation main rod (31) is arranged on the top end of the Z-shaped transmission arm (30).

7. A three-position small circuit breaker according to claim 1, characterized in that: The grounding member comprises: An opening main rod (32) is hingedly connected with the grounding knife (9) at one end; A linkage spring (34) is arranged outside the opening main rod (32); A rotating shaft (37) is arranged inside the main box (2); A torsion block (35) is fixedly installed on the rotating shaft (37).

Images