Circuit breaker mechanism and micro-energy opening tripping device thereof

Abstract

The utility model relates to circuit breaker mechanism and micro energy opening trip device thereof. Circuit breaker mechanism includes base frame and installs the opening half axle, opening energy storage mechanism and output shaft of base frame, and opening half axle can pivot to lock or release opening energy storage mechanism, and opening energy storage mechanism drives the engagement output shaft. Micro energy opening trip device includes: electromagnetic trip, installs base frame and has the movable piece that can respond to preset current condition and move and drive opening half axle pivot to release opening energy storage mechanism, integrated reset crank, pivot installation base frame and connect movable piece, when output shaft closing rotation, reset crank is driven and rotates along first direction and unlocks movable piece, allows movable piece to move to the direction of drive opening half axle, when output shaft opening rotation, reset crank is driven and rotates along second direction and drives the engagement movable piece, makes movable piece along the direction of away from opening half axle reset, biasing member, connects reset crank and applies and makes it along the biasing force of second direction rotation.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to circuit breaker mechanism and its micro-energy tripping device. Background Technology

[0002] Ring main units are core components of secondary power distribution, and circuit breaker cabinets are currently the primary application. To meet users' ever-increasing demands for the functionality of circuit breaker cabinets, a circuit breaker mechanism solution has been developed that adds a micro-energy tripping device in addition to the conventional tripping coil.

[0003] For example, Chinese patent application number 2022204032393, filed on February 25, 2022, proposes a low-energy tripping operating mechanism for circuit breakers. In this mechanism, an electromagnet is mounted on a fixed plate. One end of the electromagnet's core abuts against the tripping half-shaft, and a limit nut is fixedly mounted on the other end. A connecting member and a driving member are connected via a hinge shaft, and the connecting member is connected to the limit nut. A buffer transition member is provided between the connecting member and the driving member.

[0004] These low-energy tripping devices have certain drawbacks, such as complex structure, numerous parts, frequent use of sheet metal riveting, and the potential need for many transmission components, resulting in a long transmission chain. These drawbacks lead to low production efficiency and high cost for low-energy tripping devices.

[0005] Based on this, the industry needs to develop an improved low-energy tripping device, which is expected to have at least the following advantages: simple structure, fewer parts, can be directly installed on existing circuit breaker mechanisms, easy to produce and assemble, and reduced cost. Utility Model Content

[0006] The present invention aims to provide a low-energy tripping device for a circuit breaker mechanism, which can at least solve some of the above-mentioned technical problems.

[0007] This invention also aims to provide a circuit breaker mechanism that applies the above-mentioned improved micro-energy tripping device.

[0008] According to one aspect of the present invention, a micro-energy tripping device for a circuit breaker mechanism is provided. The circuit breaker mechanism includes a base frame and a tripping half-shaft, a tripping energy storage mechanism, and an output shaft mounted on the base frame. The tripping half-shaft is pivotable to lock or release the tripping energy storage mechanism, and the tripping energy storage mechanism drives the output shaft to engage. The micro-energy tripping device includes: an electromagnetic trip unit mounted on the base frame and having a movable component, the movable component being able to move in response to a preset current condition and drive the tripping half-shaft to pivot, thereby releasing the tripping energy storage mechanism; an integral reset crank arm, pivotally mounted on the base frame and connected to the movable component, wherein when the output shaft rotates in the closing direction, the reset crank arm is driven to rotate in a first direction and unlock the movable component, allowing the movable component to move in the direction driving the tripping half-shaft, and when the output shaft rotates in the opening direction, the reset crank arm is driven to rotate in a second direction opposite to the first direction and drive to engage the movable component, causing the movable component to reset in a direction away from the tripping half-shaft; and a biasing component connected to the reset crank arm and applying a biasing force to the reset crank arm to cause it to rotate in the second direction.

[0009] The micro-energy tripping device provided in this solution adopts an integrated reset crank arm, which is designed to directly interact with the moving end (moving part) of the electromagnetic trip unit. This simplifies the transmission design and shortens the transmission chain, effectively reducing the number of parts, thereby improving production and assembly efficiency and reducing the probability of jamming during transmission. Many components in the device, such as the electromagnetic trip unit, can be made using injection-molded parts, improving integration while reducing costs. This solution eliminates the traditional buffer transition structure, resulting in a simpler structure that can be directly assembled into existing circuit breaker mechanisms without requiring adaptation modifications.

[0010] In some embodiments, the output shaft is provided with a cam. When the output shaft rotates in the closing direction, the cam drives the reset crank arm to rotate in the first direction. When the output shaft rotates in the opening direction, the cam disengages from the reset crank arm.

[0011] In some embodiments, the reset crank arm has a pivotable engagement member on one side of its pivot axis. When the output shaft rotates in the closing direction, the cam is driven to engage with the engagement member, and at least the portion of the engagement member that contacts the cam has an arcuate outer circumferential surface.

[0012] In some embodiments, the movable part of the electromagnetic trip unit is provided with a limiting member that protrudes at an angle to its direction of movement, and the reset crank arm is provided with a pivotable actuator on the other side of its pivot axis. The actuator is sleeved on the movable part of the electromagnetic trip unit. When the output shaft rotates in the opening direction, the actuator pushes against the limiting member, causing the movable part to reset in a direction away from the opening half-shaft.

[0013] In some embodiments, at least a portion of the movable element of the electromagnetic trip unit is configured as an elongated rod segment, the limiting member is located at the end of the rod segment remote from the tripping half-shaft, and the actuating member has an elongated hole for receiving the rod segment.

[0014] In some embodiments, the surface of the actuator facing the limiting member is configured with a planar segment, which pushes against the limiting member when the output shaft rotates in the opening direction, driving the rod segment to move along its axial direction.

[0015] In some embodiments, the biasing element is configured as a torsion spring, which is sleeved on the pivot of the reset crank arm, with one leg of the torsion spring abutting against the reset crank arm and the other leg abutting against a fixed shaft extending from the base frame.

[0016] In some embodiments, the two torsion springs are arranged side by side along the axial direction of the pivot of the reset crank arm.

[0017] In some embodiments, the tripping half-shaft is provided with a trigger arm. When the movable element of the electromagnetic trip unit moves in response to the preset current condition, the movable element drives the trigger arm to engage, thereby causing the tripping half-shaft to pivot.

[0018] According to another aspect of this utility model, a circuit breaker mechanism is provided, including a base frame and a tripping half-shaft, a tripping energy storage mechanism, an output shaft, and a micro-energy tripping release device mounted on the base frame. The tripping half-shaft is pivotable to lock or release the tripping energy storage mechanism. The tripping energy storage mechanism drives the output shaft to engage, and the micro-energy tripping release device drives the tripping half-shaft to engage. The micro-energy tripping release device is the aforementioned micro-energy tripping release device.

[0019] Other features and advantages of this invention will partly be apparent to those skilled in the art upon reading this application, and partly will be described in conjunction with the accompanying drawings in the detailed description below. Attached Figure Description

[0020] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings, wherein:

[0021] Figure 1This is a schematic diagram of a circuit breaker mechanism according to an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of an electromagnetic trip device according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the reset mechanism according to an embodiment of the present utility model;

[0024] Figures 4 to 6 This is a schematic diagram illustrating the working principle of the micro-energy tripping device according to an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures

[0026] 1-Circuit breaker mechanism; 11-Front plate; 12-Middle plate; 13-Rear plate; 14-Trip half shaft; 15-Output shaft; 16-Fixed shaft; 2-Micro-energy tripping device; 3-Trigger arm; 4-Electromagnetic trip unit; 41-Bracket; 42-Housing; 43-Trip spring; 44-Coil; 45-Moving part; 46-Limiting part; 5-Reset crank arm; 51-Pivot; 52-Arm section; 53-Rib; 6-Actuator; 61-Elongated hole; 62-Flat section; 7-Connecting part; 71-Pin; 8-Biasing part; 81-Torsion spring; 811-Feet; 812-Feet; 9-Cam Detailed Implementation

[0027] The schematic solutions of the technical solutions disclosed in this utility model are now described in detail with reference to the accompanying drawings. Although the drawings are provided to illustrate some embodiments of this utility model, the drawings are not necessarily drawn to the dimensions of the specific embodiments, and certain features may be enlarged, removed, or partially cut to better illustrate and explain the disclosure of this utility model. Some components in the drawings may be repositioned according to actual needs without affecting the technical effect. The phrase "in the drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0028] Certain directional terms used in the description of the accompanying drawings below, such as “inner,” “outer,” “above,” “below,” and other directional terms, will be understood to have their normal meaning and refer to those directions as normally viewed in the accompanying drawings. Unless otherwise specified, the directional terms used in this specification are generally in accordance with the conventional directions understood by those skilled in the art.

[0029] The terms “first,” “first,” “second,” “second,” and similar terms used in this utility model do not indicate any order, quantity, or importance, but are used to distinguish one component from other components.

[0030] Figure 1The structure of a circuit breaker mechanism 1 is illustrated exemplarily. The circuit breaker mechanism 1 includes a frame-shaped base and various functional devices mounted on the base, such as an operating mechanism, a transmission mechanism, a tripping energy storage mechanism, a closing energy storage mechanism, a tripping mechanism, and an output shaft or main shaft. The base can be arranged in a layered layout, including a front plate 11, a middle plate 12, and a rear plate 13 arranged parallel to each other and spaced apart. The aforementioned functional devices can be arranged layer by layer on these plates, for example, based on ease of operation and maintenance. For example, the operating mechanism can be mounted on the front plate 11 facing the operator, while the transmission and energy storage mechanisms are arranged between the front plate 11 and the middle plate 12, or between the middle plate 12 and the rear plate 13. The output shaft 15 can extend through the entire base, from the front plate 11 to the rear plate 13.

[0031] The low-energy tripping device 2 can be directly mounted on the base frame of the circuit breaker mechanism 1 and is compatible with the layout of the existing functional devices. In the illustrated embodiment, the low-energy tripping device 2 mainly includes an electromagnetic trip unit 4 and a reset mechanism for the electromagnetic trip unit 4.

[0032] like Figure 2 As shown, the electromagnetic trip unit 4 can be mounted on the base frame of the circuit breaker mechanism 1 via the housing 42, corresponding to the position of the tripping half-shaft 14. For example, if the tripping half-shaft 14 passes through the middle plate 12 and its end is located between the middle plate 12 and the rear plate 13, then the electromagnetic trip unit 4 is mounted on the surface of the middle plate 12 facing the rear plate 13 and positioned above the tripping half-shaft 14. A bracket 41 is fixedly mounted on one end of the housing 42 to accommodate or support the permanent magnet. A coil 44 is wound inside the housing 42, and the control circuit connected to the coil 44 is connected in series to an auxiliary switch of the circuit breaker mechanism 1. A rod-shaped movable member 45 (also called the moving end or armature) passes through the coil 44 and the permanent magnet, with its relatively slender upper end extending out of the housing 42 and having a radially protruding limiting member 46. The limiting member 46 can be simply configured as a removable nut that fits onto the top of the movable member 45. In addition, a washer can be fitted onto the movable member 45 and abutted against the lower surface of the nut facing the housing 42 to reduce wear. In other embodiments not shown, the limiting member 46 may also be a radial flange or boss integrally formed on the upper end of the movable member. The thicker lower end of the movable member 45 extends from the bracket 41 and is fitted with a trip spring 43. One end of the trip spring 43 abuts against the outer surface of the bracket 41, and the other end abuts against the radial flange at the lower end of the movable member 45. Components of the electromagnetic trip unit 4, such as the housing 42 and the bracket 41, may be injection-molded parts, offering high integration and low cost.

[0033] When the circuit breaker mechanism 1 is in the closed state, the coil 44 is de-energized. The magnetic attraction torque of the permanent magnet is greater than the counter-torque of the trip spring 43, holding the movable part 45 in the closed position. When the control system of the circuit breaker mechanism 1 sends a trip signal, the coil 44 is energized, the magnetic force of the permanent magnet is canceled out, the trip spring 43 releases energy, and pushes the movable part 45 downward. The downward movement of the movable part 45 will push the trip half-shaft 14 to rotate a certain angle, causing the trip half-shaft 14 to open the trip energy storage mechanism, so that the output shaft 15 can rotate in the trip direction under the drive of the trip energy storage spring. Here, the electromagnetic trip unit 4 only requires extremely low energy consumption to trigger the movable part 45, therefore the electromagnetic trip unit 4 can also be called a low-energy trip unit or a low-energy trip unit.

[0034] For the purpose of cooperating with the electromagnetic trip unit 4, a detachable trigger arm 3 can be fitted onto the opening half-shaft 14. This trigger arm can be an injection-molded part, which is relatively inexpensive. The trigger arm 3 extends from the opening half-shaft 14 directly below the electromagnetic trip unit 4. When the circuit breaker mechanism 1 is in the closed state, the movable part 45 of the electromagnetic trip unit 4, which is in the attracted state, can only contact the trigger arm 3, or be separated from it by a small distance. When the coil 44 is energized, the trip spring 43 drives the movable part 45 to move downwards and strike the trigger arm 3, pushing the trigger arm 3 and the opening half-shaft 14 to rotate together, thereby unlocking the opening energy storage mechanism.

[0035] The reset mechanism of the electromagnetic trip unit 4 can also be mounted on the middle plate 12 of the base frame of the circuit breaker mechanism 1, making the entire micro-energy tripping device 2 more compact. The reset mechanism is intended to provide a reset force to the electromagnetic trip unit 4 during the tripping of the circuit breaker mechanism 1, so that the moving part 45 returns to the engaged position, during which the trip spring 43 is compressed and stores energy.

[0036] like Figure 3 As shown, the reset crank arm 5 is mounted on a pivot 51 extending from the middle plate 12 toward the rear plate 13 and can rotate about the pivot 51. The reset crank arm 5 can be a one-piece molded part with a certain structural strength. In the illustrated embodiment, the reset crank arm 5 includes two arm segments 52 arranged axially spaced along the pivot 51, and a plurality of ribs 53 connecting the two arm segments 52. The first end of the reset crank arm 5 located on one side of the pivot 51 ( Figure 3 The left end shown can drive the movable part 45 of the electromagnetic trip unit 1 during the opening of the circuit breaker mechanism 1, causing the movable part 45 to move to the closed position. The second end of the reset crank arm 5, located on the opposite side of the pivot 51, is... Figure 3 The right end shown is driven by the output shaft 15 during the closing of the circuit breaker mechanism 1, so that the reset crank arm 5 rotates about the pivot 51 to its first end to release the movable member 45 and make room for the movement of the movable member 45, allowing the movable member 45 to move downward in response to the current flowing through the coil 44 and trigger the opening half shaft 14 to pivot.

[0037] In the illustrated embodiment, a second pivot parallel to pivot 51 is provided at the first end of the reset crank arm 5, and an actuator 6 is fitted onto this second pivot. The actuator 6 may be an injection-molded integral part. The actuator 6 can rotate about this second pivot to adjust its orientation relative to the limiting member 46 of the movable member 45. An elongated hole 61 is formed on the actuator 6, and the upper end of the movable member 45 of the electromagnetic trip unit 4 passes through the elongated hole 61 after extending out of the housing 42. The limiting member 46 and the housing 42 are located on opposite sides of the actuator 6. The size of the limiting member 46 is larger than the width of the elongated hole 61, thereby creating interference between the limiting member 46 and the elongated hole 61 in the direction of movement of the movable member 45. When the circuit breaker mechanism 1 trips, the reset crank arm 5 is driven to rotate about pivot 51, causing the actuator 6 to abut against the limiting member 46 and driving the movable member 45 to move upward to the engaging position. When the circuit breaker mechanism 1 closes, the reset crank arm 5 is driven to rotate in the opposite direction around the pivot 51, causing the actuator 6 to move away from the limit member 46 along the movable member 45, leaving enough space between the actuator 6 and the limit member 46 for the movable member 45 to move down and drive the opening half shaft 14.

[0038] The surface of the actuator 6 facing the limiting member 46 can be configured with a planar segment 62. In conjunction with the elongated hole 61 and the pivoting of the actuator 6 itself, when the actuator 6 drives the movable member 45 to return to the engaged position, the planar segment 62 remains perpendicular to the axial direction of the rod-shaped movable member 45, pushing the movable member 45 to maintain its upward movement along its own axial direction. Since the movable member 45 is typically designed as a rod-shaped structure, especially at the upper end extending from the housing 42 where it is constructed as a slender rod segment, maintaining the movable member 45's movement along its own axial direction effectively prevents deformation of the slender rod segment, ensuring reliable transmission and stable disengagement.

[0039] The pivoting of the reset crank arm 5 during the opening of the circuit breaker mechanism 1 is driven by a biasing member 8. The biasing member 8 connects the reset crank arm 5 to the base of the circuit breaker mechanism 1 and consistently applies a force to the reset crank arm 5 to pivot it. In the illustrated embodiment, the biasing member 8 is constructed as two torsion springs 81, which are sleeved on the pivot 51 between the two arm segments 52 of the reset crank arm 5 and arranged axially along the pivot 51. One leg 811 of each torsion spring 81 abuts against the lower surface of the reset crank arm 5 between the first end of the reset crank arm 5 and the pivot 51, and the other leg 812 abuts against a fixed shaft 16 extending from the center plate 12. This fixed shaft 16 can be any suitable shaft in any of the various functional devices of the circuit breaker mechanism 1. It is understood that a single torsion spring may also be provided if sufficient torque is required. Furthermore, the biasing element 8 is not limited to a torsion spring; for example, it can be replaced with a tension spring or a compression spring, as long as sufficient force can be applied to the reset crank arm 5 so that it can pivot during the opening of the circuit breaker mechanism 1 to drive the movable element 45 to reset.

[0040] The pivoting of the reset crank arm 5 during the closing of the circuit breaker mechanism 1 is driven by the output shaft 15. Adapting to the relative positional relationship between the reset crank arm 5 and the output shaft 15, a cam 9 can be provided on the output shaft 15. This cam 9 can rotate together with the output shaft 15 in either the opening or closing direction. During the closing of the circuit breaker mechanism 1, the cam 9 rotates to engage with the second end of the reset crank arm 5 and drives the reset crank arm 5 to pivot, overcoming the biasing member 8 to cause the actuator 6 at the first end of the reset crank arm 5 to fall along the movable member 45 and release the limiting member 46. To reduce friction between the reset crank arm 5 and the cam 9, a pin 71 parallel to the pivot 51 can be provided at the second end of the reset crank arm 5, and a roller-shaped engaging member 7 can be fitted onto the pin 71. The engaging member 7 can rotate around the pin 71. When the cam 9 drives the engaging roller, the outer circumferential surface of the roller forms rolling friction with the smooth outer surface of the cam 9, reducing frictional resistance and driving resistance.

[0041] The following is combined Figures 4 to 6 The working principle of the micro-energy tripping device 2 is described in detail.

[0042] like Figure 4 As shown, the circuit breaker mechanism 1 is already in the closed state. At this time, the movable part 45 of the electromagnetic trip unit 4 is held in the attracted position as shown in the figure under the action of the permanent magnet, while the limiting part 46 located at the upper end of the movable part 45 is away from the housing 42. During this stage, the cam 9 overcomes the force of the biasing part 8 and lifts the second end of the reset crank arm 5, causing the actuator 6 at the first end of the reset crank arm 5 to fall, making room for the ejection movement of the movable part 45 of the electromagnetic trip unit 4.

[0043] Next reference Figure 5 When the electromagnetic trip unit 4 receives the tripping signal from the control system, the coil 44 of the electromagnetic trip unit 4 is energized, which cancels the magnetic force of the permanent magnet. The movable part 45 will be pushed downward under the action of the tripping spring 43. The lower end of the movable part 45 pushes the trigger arm 3 to drive the tripping half shaft 14 to rotate clockwise, and the circuit breaker mechanism 1 performs the tripping action.

[0044] Next, refer to Figure 6 After the tripping action is completed, the output shaft 15, driven by the tripping energy storage spring, will cause the cam 9 to rotate clockwise, disengaging the cam 9 from the second end of the reset crank arm 5. Under the action of the biasing member 8, the reset crank arm 5 will rotate clockwise around the pivot 51, causing the actuator 6 at the first end to move upward along the movable member 45 until it abuts against the limiting member 46, and driving the movable member 45 to move upward as a whole to re-engage. During this process, the tripping spring 43 is compressed and stores energy.

[0045] The closing process of circuit breaker mechanism 1 can be referred to again. Figure 4During the closing phase, the output shaft 15 moves counterclockwise along with the cam 9. The cam 9 contacts the roller at the second end of the reset crank arm 5, driving the reset crank arm 5 to rotate counterclockwise around the pivot 51 against the biasing element 8. The rotation of the reset crank arm 51 causes the actuator 6 at the first end to fall along the movable element 45 and release the limiting element 46 until it returns to its original position. Figure 4 The circuit breaker is shown in the closed state.

[0046] It should be understood that although this specification describes various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0047] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes, modifications, and combinations made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A low-energy tripping device for a circuit breaker mechanism, the circuit breaker mechanism comprising a base frame and a tripping half-shaft (14), a tripping energy storage mechanism and an output shaft (15) mounted on the base frame, wherein the tripping half-shaft (14) is pivotable to lock or release the tripping energy storage mechanism, and the tripping energy storage mechanism drives the output shaft (15). Its features are, The micro-energy tripping device includes: An electromagnetic trip unit (4) is mounted on the base frame and has a movable part (45). The movable part (45) can move in response to a preset current condition and drive the tripping half shaft (14) to pivot, so as to release the tripping energy storage mechanism. An integrated reset crank arm (5) is pivotally mounted on the base frame and connected to the movable member (45). When the output shaft (15) rotates in the closing direction, the reset crank arm (5) is driven to rotate in the first direction and unlock the movable member (45) to allow the movable member (45) to move in the direction of driving the opening half shaft (14). When the output shaft (15) rotates in the opening direction, the reset crank arm (5) is driven to rotate in the second direction opposite to the first direction and drive to engage the movable member (45) so that the movable member (45) resets in the direction away from the opening half shaft (14). A biasing element (8) is connected to the reset crank arm (5) and applies a biasing force to the reset crank arm (5) to rotate it in the second direction.

2. The micro-energy tripping device for the circuit breaker mechanism according to claim 1, characterized in that, The output shaft (15) is provided with a cam (9). When the output shaft (15) rotates in the closing direction, the cam (9) drives and engages with the reset crank arm (5), causing the reset crank arm (5) to rotate in the first direction. When the output shaft (15) rotates in the opening direction, the cam (9) leaves the reset crank arm (5).

3. The micro-energy tripping device for the circuit breaker mechanism according to claim 2, characterized in that, The reset crank arm (5) has a pivotable engagement member (7) on one side of its pivot axis. When the output shaft (15) rotates in the closing direction, the cam (9) is driven to engage with the engagement member (7). The part of the engagement member (7) that at least contacts the cam (9) has an arc-shaped outer circumferential surface.

4. The micro-energy tripping device for the circuit breaker mechanism according to claim 1, characterized in that, The movable part (45) of the electromagnetic trip unit (4) is provided with a limiting part (46) protruding at an angle to its direction of movement. The reset crank arm (5) is provided with a pivotable actuator (6) on the other side of its pivot axis. The actuator (6) is sleeved on the movable part (45) of the electromagnetic trip unit (4). When the output shaft (15) rotates in the opening direction, the actuator (6) pushes against the limiting part (46) to reset the movable part (45) in a direction away from the opening half shaft (14).

5. The low-energy tripping device for the circuit breaker mechanism according to claim 4, characterized in that, At least a portion of the movable element (45) of the electromagnetic trip unit (4) is configured as an elongated rod segment, the limiting element (46) is provided at the end of the rod segment away from the tripping half shaft (14), and the actuating element (6) has an elongated hole (61) for receiving the rod segment.

6. The low-energy tripping device for the circuit breaker mechanism according to claim 5, characterized in that, The surface of the actuator (6) facing the limiting member (46) is configured with a planar segment (62). When the output shaft (15) rotates in the opening direction, the planar segment (62) pushes against the limiting member (46) and drives the rod segment to move along its axial direction.

7. The micro-energy tripping device for the circuit breaker mechanism according to claim 1, characterized in that, The biasing member (8) is configured as a torsion spring (81), which is sleeved on the pivot (51) of the reset crank arm (5). One leg (811) of the torsion spring (81) abuts against the reset crank arm (5), and the other leg (812) abuts against the fixed shaft (16) extending from the base frame.

8. The micro-energy tripping device for the circuit breaker mechanism according to claim 7, characterized in that, The two torsion springs (81) are arranged side by side along the axial direction of the pivot (51) of the reset crank arm (5).

9. The micro-energy tripping device for the circuit breaker mechanism according to claim 1, characterized in that, The tripping half shaft (14) is provided with a trigger arm (3). When the movable part (45) of the electromagnetic trip unit (4) moves in response to the preset current condition, the movable part (45) drives the trigger arm (3) to engage, so that the tripping half shaft (14) pivots.

10. A circuit breaker mechanism, comprising a base frame and a tripping half-shaft (14), a tripping energy storage mechanism, an output shaft (15), and a micro-energy tripping release device (2) mounted on the base frame, wherein the tripping half-shaft (14) is pivotable to lock or release the tripping energy storage mechanism, the tripping energy storage mechanism drives the output shaft (15), and the micro-energy tripping release device (2) drives the tripping half-shaft (14), characterized in that, The micro-energy tripping device (2) is the micro-energy tripping device according to any one of claims 1 to 9.

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