Operation of a circuit breaker with a trip mechanism

Abstract

The application discloses an operating and tripping mechanism of a circuit breaker, which is composed of a handle, a pull rod, a lock catch, a moving contact, a tension spring and a static contact assembly through a simple core component matching and integrated mechanical linkage design, and discloses the following technical scheme: abandoning redundant parts of a traditional mechanism, greatly simplifying the structure, reducing assembly procedures and matching gaps, reducing production manufacturing cost, and saving internal space to adapt to small-sized design of the circuit breaker. Clockwise rotation of the handle can realize synchronous linkage of multiple components, complete consecutive actions of power transmission, moving contact locking, moving contact contact and overtravel pressure application, stably ensure close contact of the conductive cooperation, and reduce contact resistance and heating. When the circuit breaker is manually broken, the tension spring releases elastic potential energy to drive the moving contact to be quickly broken, and the breaking speed is fast. The unlocking and breaking actions are seamlessly linked, operation is convenient, and response is sensitive. Precise gaps and surface contact cooperation of the components reduce movement wear, and improve movement precision and long-term action reliability.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and in particular to an operating and tripping mechanism for a circuit breaker. Background Technology

[0002] Circuit breakers are core electrical devices in power systems used to protect circuits from abnormal conditions such as short circuits and overloads. Their operating and tripping mechanisms, as core components, directly determine the reliability, response speed, and operating cost of the circuit breaker's on / off control. Traditional circuit breaker operating mechanisms typically consist of multiple parts, including a handle, transmission rod, trip latch, locking latch, and return spring. This complex structure and numerous parts not only lead to cumbersome assembly processes and high manufacturing costs, but also cause malfunctions such as mechanism jamming and slow tripping speeds due to the interlocking clearances of multiple components, thus affecting the circuit breaker's protective performance and service life. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an operation and tripping mechanism for a circuit breaker.

[0004] The technical solution adopted by this invention to solve its technical problem is: to construct an operating and tripping mechanism for a circuit breaker, comprising: handle; A pull rod is connected to the handle and is used to transmit the rotational power of the handle. The end of the pull rod away from the handle is provided with a joint. The latch has a matching groove and an elastic part, and the engaging part is slidably installed in the matching groove; The moving contact is rotatably connected to the circuit breaker housing via a rotating shaft. The moving contact is provided with a locking part. The engaging part passes through the mating groove and abuts against the locking part. The moving contact is connected to the elastic part at the lower end of the latch. A tension spring, one end of which is fixed to the circuit breaker housing and the other end of which is connected to the moving contact; A stationary contact assembly is disposed opposite to the moving contact to form a conductive engagement, and the stationary contact assembly includes a push rod; The handle rotates clockwise under external force to drive the pull rod, the moving contact, and the latch to rotate clockwise synchronously until the moving contact contacts the stationary contact assembly; the latch continues to move backward under the drive of the handle until the handle reaches the closed position, realizing the manual connection of the circuit breaker. When the circuit breaker is opened, the handle rotates counterclockwise under the action of external force, which drives the pull rod to rotate synchronously. The pull rod drives the moving contact and the latch to move. The tension spring releases elastic potential energy to make the moving contact and the latch rotate counterclockwise rapidly around the rotating axis. The moving contact separates from the stationary contact assembly, realizing the manual disconnection of the circuit breaker. When the short-circuit current trips, the push rod in the stationary contact assembly pushes out, causing the latch to move counterclockwise. At this time, the elastic part is compressed, the mating groove separates from the engaging part, releasing the restriction on the engaging part. The elastic part of the latch and the tension spring release elastic potential energy, causing the moving contact to rotate rapidly counterclockwise around the rotating shaft. The moving contact separates from the stationary contact assembly, realizing the rapid disconnection of the circuit breaker.

[0005] In some embodiments, the operation and tripping mechanism of the circuit breaker further includes a bimetallic rod and a bimetallic strip; The latch is also provided with a mating part, one end of the bimetallic rod is embedded in the mating part, and the other end is connected to the free end of the bimetallic strip. The fixed end of the bimetallic strip is fixed to the circuit breaker housing. When the circuit is overloaded while the circuit breaker is in the on state, the bimetallic strip bends and deforms with the temperature rise and pushes the bimetallic rod. The bimetallic rod transmits the pushing force to the latch, causing the joint to separate from the locking part, releasing the restriction on the moving contact. The tension spring releases its elastic potential energy, causing the moving contact to rotate counterclockwise and separate from the stationary contact assembly, thus forming the circuit breaker overload tripping.

[0006] In some embodiments, the bimetallic sheet is a thermally bimetallic composite layered structure.

[0007] In some embodiments, the stationary contact assembly includes an electromagnetic tripping structure, which includes a coil and an iron core; The coil is coaxially wound on the outside of the iron core, and the push rod passes through the axial through hole of the iron core and is arranged opposite to the elastic part.

[0008] In some embodiments, the mating groove is a strip-shaped through-hole structure, which is formed along the length direction of the latch.

[0009] In some embodiments, the moving contact is an integral stamped structure, including a hinge part, a conductive part and a linkage part. The hinge part has a shaft hole and forms a rotational engagement with the rotating shaft of the circuit breaker housing. The conductive part is used to form a conductive engagement with the stationary contact assembly. The linkage part is connected to the tension spring.

[0010] In some embodiments, both ends of the tension spring are integrally formed with hook structures. One end of the tension spring hook is engaged with a protrusion on the circuit breaker housing, and the other end hook is engaged with the linkage part.

[0011] In some embodiments, the conductive portion of the moving contact is welded with a silver-based alloy contact.

[0012] In some embodiments, the handle and the lever are connected by a pin or a snap-fit.

[0013] In some embodiments, the latch body has a hinge hole, and the latch forms a rotational engagement with a hinge post on the circuit breaker housing through the hinge hole.

[0014] The implementation of this invention has the following beneficial effects: The circuit breaker's operation and tripping mechanism adopts a minimalist core component combination and integrated mechanical linkage design, consisting of a handle, pull rod, latch, moving contact, tension spring, and stationary contact assembly. It eliminates redundant parts in traditional mechanisms, significantly simplifies the structure, reduces assembly processes and fitting gaps, lowers manufacturing costs, and saves internal space to accommodate the miniaturized design of circuit breakers. Clockwise rotation of the handle enables synchronous linkage of multiple components, completing a continuous action of power transmission, moving contact locking, moving contact contact, and over-travel pressure application. Stable contact pressure ensures tight conductive contact, reducing contact resistance and heat generation. During manual tripping, the tension spring releases elastic potential energy to drive the moving contact to trip quickly, resulting in fast tripping speed. Unlocking and tripping actions are seamlessly linked, making operation convenient and responsive. Precise gaps and surface contact fits of each component reduce wear and tear, improve motion accuracy and long-term operational reliability, and the core structure has good compatibility, allowing for easy expansion with overload and short-circuit tripping functions. Attached Figure Description

[0015] To more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the circuit breaker in some embodiments of the present invention, showing the operation and tripping mechanism in the on state; Figure 2 This is a schematic diagram of the overall structure of the circuit breaker in some embodiments of the present invention, showing the operation and tripping mechanism in the disconnected state; Figure 3 This is a three-dimensional schematic diagram of the internal structure of the operation and tripping mechanism of the circuit breaker in some embodiments of the present invention; Figure 4 These are schematic diagrams of the latch structure in some embodiments of the present invention; Figure 5 This is a schematic diagram of the structure of the moving contact in some embodiments of the present invention. Detailed Implementation

[0016] To provide a clearer understanding of the technical features, objectives, and effects of this invention, specific embodiments are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or element referred to must have a specific orientation; therefore, they should not be construed as limitations on this invention.

[0017] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0018] Please see Figures 1 to 5 This is an operation and tripping mechanism for a circuit breaker according to some embodiments of the present invention, comprising a handle 1, a pull rod 2, a latch 3, a moving contact 4, a tension spring 5, and a stationary contact assembly 6; the pull rod 2 is connected to the handle 1 and is used to transmit the rotational power of the handle 1; the latch 3 is provided with a mating groove 31 and an elastic part 32, and the engaging part 21 is slidably installed in the mating groove 31; the moving contact 4 is rotatably connected to the circuit breaker housing through a rotating shaft, and the moving contact 4 is provided with a locking part 41, the engaging part 21 passes through the mating groove 31 and abuts against the locking part 41, and the moving contact 4 is connected to the elastic part 32 at the lower end of the latch 3; one end of the tension spring 5 is fixed to the circuit breaker housing, and the other end is hooked to the moving contact 4; the stationary contact assembly 6 is disposed opposite to the moving contact 4 to form a conductive engagement, and the stationary contact assembly 6 includes a push rod 63.

[0019] When the circuit breaker is manually closed, the handle 1 rotates clockwise under external force, causing the pull rod 2, moving contact 4, and latch 3 to rotate clockwise synchronously until the moving contact 4 contacts the stationary contact assembly 6. The latch 3 continues to move backward under the drive of the handle 1 until the handle 1 reaches the closed position. When the circuit breaker is manually closed, the handle 1 rotates counterclockwise under external force, causing the pull rod 2 to rotate synchronously. The pull rod 2 drives the moving contact 4 and latch 3 to move. The tension spring 5 releases its elastic potential energy, causing the moving contact 4 and latch 3 to rotate rapidly counterclockwise around the axis of rotation. The moving contact 4 separates from the stationary contact assembly 6, thus manually disconnecting the circuit breaker. When the short-circuit current trips, the push rod in the stationary contact assembly 6 pushes out, causing the latch 3 to move counterclockwise. At this time, the elastic part 32 is compressed, and the locking groove 31 separates from the locking part 41, releasing the restriction on the engaging part 21. The elastic part 32 of the latch 3 and the tension spring 5 release elastic potential energy, causing the moving contact 4 to rotate counterclockwise rapidly around the rotating shaft. The moving contact 4 separates from the stationary contact assembly 6, realizing the rapid disconnection of the circuit breaker.

[0020] In some alternative embodiments of the present invention, the circuit breaker operation and tripping mechanism can adopt an integrated structure design of the reset spring and the latch, according to the actual structural adaptation requirements, to replace the traditional separate assembly scheme.

[0021] Understandably, such as Figure 1 As shown, when the handle 1 is rotated clockwise by an external force, it drives the pull rod 2 and the latch 3 to rotate clockwise simultaneously. The moving contact 4 rotates with the pull rod 2 until it contacts the stationary contact assembly 6. After the moving contact 4 contacts the stationary contact assembly 6, the latch 3 can continue to move under the drive of the handle 1 until the elastic part 32 abuts against the stationary contact assembly 6, realizing manual connection. At this time, the latch 3 generates overtravel and contact pressure to ensure the tightness of the conductive contact between the moving contact 4 and the stationary contact assembly 6. Figure 2 As shown, during manual disconnection, the handle 1 rotates counterclockwise under external force, causing the pull rod 2 and the latch 3 to rotate synchronously, so that the joint 21 separates from the locking part 41 to release the restriction on the moving contact 4. Meanwhile, the compression of the elastic part 32 further increases, and the tension spring 5 releases its elastic potential energy to drive the moving contact 4 to rotate counterclockwise around the rotating shaft, so that the moving contact 4 separates from the stationary contact assembly 6, thus realizing manual disconnection.

[0022] This circuit breaker's operating and tripping mechanism employs a minimalist core component combination and integrated mechanical linkage design, consisting of a handle 1, pull rod 2, latch 3, moving contact 4, tension spring 5, and stationary contact assembly 6. It eliminates redundant parts from traditional mechanisms, significantly simplifying the structure, reducing assembly processes and clearances, lowering manufacturing costs, and saving internal space to accommodate miniaturized circuit breaker designs. Clockwise rotation of the handle 1 enables synchronous linkage of multiple components, completing a continuous action of power transmission, moving contact 4 locking, moving contact 4 contact, and over-travel pressure application. Stable contact pressure ensures tight conductive contact, reducing contact resistance and heat generation. During manual tripping, the tension spring 5 releases its elastic potential energy to quickly trip the moving contact 4, resulting in rapid tripping. Unlocking and tripping actions are seamlessly linked, offering convenient operation and sensitive response. Precise clearances and surface contact fits between components reduce wear, improve motion accuracy and long-term operational reliability, and the core structure has good compatibility, allowing for easy expansion with overload and short-circuit tripping functions.

[0023] like Figure 1 and Figure 2 As shown, the circuit breaker's operation and tripping mechanism also includes a bimetallic rod 8 and a bimetallic strip 9; the latch 3 also has a mating part 33, one end of the bimetallic rod 8 is embedded in the mating part 33, and the other end is connected to the free end of the bimetallic strip 9, while the fixed end of the bimetallic strip 9 is fixed to the circuit breaker housing. When the circuit is overloaded in the circuit-on state, the bimetallic strip 9 bends and deforms with temperature rise, pushing against the bimetallic rod 8. The bimetallic rod 8 transmits the thrust to the latch 3, causing the engaging part 21 to separate from the locking part 41, releasing the restriction on the moving contact 4. The tension spring 5 releases its elastic potential energy, causing the moving contact 4 to rotate counterclockwise and separate from the stationary contact assembly 6, thus forming the circuit breaker overload tripping. The structural design of adding the bimetallic rod 8 and the bimetallic strip 9 achieves delayed automatic tripping for circuit overload. The bimetallic rod 8 linearly transmits the bending thrust of the bimetallic strip 9 to the latch 3, with no loss in thrust transmission, ensuring the sensitivity of the overload tripping action.

[0024] The bimetallic strip 9 is a thermally bimetallic composite layered structure composed of two metals with different coefficients of thermal expansion. When the circuit is overloaded, the Joule heat generated by the current causes the temperature of the bimetallic strip 9 to rise. Because the two metals expand at different rates, the side with the greater expansion will extend outwards, while the side with the smaller expansion will expand more slowly, causing the bimetallic strip 9 to bend and deform unilaterally towards the side with the smaller expansion. The bimetallic strip 9 can undergo unilateral bending deformation due to the Joule heat generated by the circuit overload, achieving delayed tripping for overload faults. The bimetallic strip 9 utilizes the difference in the thermal expansion coefficients of the different metals to achieve unilateral bending deformation, with stable deformation effect, accurately sensing the temperature rise changes during circuit overload, and achieving delayed tripping for overload faults with high tripping accuracy.

[0025] like Figure 2As shown, the stationary contact assembly 6 includes an electromagnetic tripping structure, which includes a coil 61 and an iron core 62. The coil 61 is coaxially wound around the outside of the iron core 62, and the push rod 63 passes through the axial through hole of the iron core 62 and is disposed opposite to the elastic part 32. When the circuit is short-circuited in the closed state of the circuit breaker, the coil 61 is energized to generate a magnetic field and drives the push rod 63 to make a linear pushing motion. The push rod 63 pushes the elastic part 32 and causes the elastic part 32 to be compressed quickly. The latch 3 rotates quickly under the pushing force, thereby causing the engagement part 21 to separate from the locking part 41, releasing the restriction on the moving contact 4. The tension spring 5 and the elastic part 32 release elastic potential energy and drive the moving contact 4 to rotate counterclockwise and separate from the stationary contact assembly 6, so that the circuit breaker short-circuit trips. The push rod 63 can quickly push the elastic part 32 to achieve short circuit tripping. The elastic compression and rapid reset characteristics of the elastic part 32 ensure the speed and sensitivity of the locking latch 3 unlocking action when short circuit tripping occurs. The short circuit tripping response speed is fast and can cut off the large short circuit current in a very short time, effectively protecting the circuit and electrical equipment.

[0026] like Figure 4 As shown, the slot 31 is a strip-shaped through hole structure. The strip-shaped through hole structure is opened along the length direction of the latch 3. The joint 21 and the strip-shaped through hole structure form a clearance sliding fit. The joint 21 can slide linearly along the length direction of the strip-shaped through hole.

[0027] like Figure 5 As shown, the moving contact 4 is an integral stamped structure, including a hinge part 42, a conductive part 43, and a linkage part 44. The hinge part 42 has a shaft hole and forms a rotational engagement with the rotating shaft of the circuit breaker housing. The conductive part 43 forms a conductive engagement with the stationary contact assembly 6. One side of the linkage part 44 is hooked to the tension spring 5. The functional divisions of the hinge part 42, the conductive part 43, and the linkage part 44 are clearly defined, respectively realizing the rotational engagement with the circuit breaker housing, the conductive engagement with the stationary contact assembly 6, and the linkage engagement with the tension spring 5 and the latch 3, thereby improving the motion stability and functional reliability of the moving contact 4.

[0028] In some embodiments, both ends of the tension spring 5 are integrally formed with hook structures. One hook of the tension spring 5 engages with a protrusion on the circuit breaker housing, and the other hook engages with a hanging hole in the linkage part 44. The engagement method is convenient for assembly and facilitates later maintenance and replacement.

[0029] In some embodiments, the conductive portion 43 of the moving contact 4 is welded with a silver-based alloy contact to improve the conductivity and arc erosion resistance of the moving contact 4 and the stationary contact assembly 6.

[0030] In some embodiments, the handle 1 and the pull rod 2 are connected by a pin or a snap-fit, which enables reliable linkage between the handle 1 and the pull rod 2 and facilitates easy assembly.

[0031] like Figure 4As shown, the latch 3 has a hinge hole 34 on its body. The latch 3 forms a rotational fit with the hinge post on the circuit breaker housing through the hinge hole 34, ensuring that the latch 3 can rotate at a small angle under the action of external force, so as to realize the precise separation and fit between the matching slot 31 and the moving contact 4 engaging part 41.

[0032] The circuit breaker operation and tripping mechanism of the present invention consists of four parts: manual connection, manual disconnection, overload tripping, and short-circuit tripping, as detailed below: Manual connection: Turn handle 1 clockwise. Handle 1 drives pull rod 2 to rotate clockwise in sync. Pull rod 2 then drives latch 3 to rotate clockwise around the hinge post of the circuit breaker housing. Moving contact 4 rotates clockwise in sync with the rotation of pull rod 2. The joint 21 of pull rod 2 is embedded in the strip-shaped through hole of latch 3 and forms an abutment fit with the engaging part 41 of moving contact 4. Moving contact 4 reaches the connection position before handle 1. Its conductive part 43 contacts the stationary contact assembly 6 to form a preliminary conductive fit. During this process, tension spring 5 is stretched as moving contact 4 rotates clockwise, completing elastic energy storage. Continue turning handle 1 clockwise. Since the moving contact 4 has already contacted and is limited by the stationary contact assembly 6, it cannot continue to rotate. Under the continuous drive of handle 1, latch 3 continues to rotate clockwise overtravel around the hinge column of the circuit breaker housing. Pull rod 2 continues to rotate clockwise synchronously with latch 3, squeezing the elastic part 32 to further compress it, thereby generating overtravel and contact pressure. During this process, the elastic part 32 is further compressed. The mechanical clamping force brought by the overtravel of latch 3 generates a stable contact pressure between the moving contact 4 and the stationary contact assembly 6, preventing loose contact. When the circuit breaker is in the closed state, the moving contact 4 is restricted by pull rod 2, completing the manual closing action of the circuit breaker. At this time, the circuit is in a stable conducting state.

[0033] Manual disconnection: Turn handle 1 counterclockwise. Handle 1 drives lever 2 to rotate counterclockwise simultaneously. Lock 3 rotates around the hinge post, causing the engagement part 21 to separate from the locking part 41, releasing the restriction on the moving contact 4. Subsequently, tension spring 5 releases its stored elastic potential energy, and elastic part 32 releases its elastic potential energy simultaneously. Auxiliary tension spring 5 drives the moving contact 4 to rotate counterclockwise around the housing axis, causing the moving contact 4 to separate from the stationary contact assembly 6, completing the manual disconnection action of the circuit breaker, and the circuit is in the open state.

[0034] Overload Tripping: When the circuit breaker is in the closed state, if an overload occurs in the circuit, the large current in the circuit causes the bimetallic strip 9 to generate Joule heat. As the temperature continues to rise, the bimetallic strip 9 undergoes unilateral bending deformation. The free end of the bimetallic strip 9 pushes against the bimetallic rod 8, transmitting the pushing force to the latch 3. This causes the latch 3 to rotate around the hinge column of the circuit breaker housing, separating the joint 21 of the pull rod 2 from the engaging part 41 of the moving contact 4. This releases the pull rod 2 from the limiting position of the moving contact 4. During the rotation of the latch 3, the elastic part 32 is compressed. The elastic driving force of the elastic part 32 assists the latch 3 in rotating, and combined with the release of the stored elastic potential energy by the tension spring 5, it generates a restoring force under compression, driving the moving contact 4 to rotate counterclockwise, separating the moving contact 4 from the stationary contact assembly 6, realizing the overload delayed tripping of the circuit breaker, and cutting off the overload fault circuit.

[0035] Short-circuit tripping: When the circuit breaker is in the closed state, if a short circuit occurs, the large short-circuit current flows into the electromagnetic tripping structure coil 61 connected in series with the main circuit. The coil 61 is energized and generates a strong magnetic field. The magnetic field is converged through the iron core 62 and conducted axially. The amplified magnetic field drives the push rod 63 to make a linear pushing motion along the axial through hole of the iron core 62. The push rod 63 pushes the elastic part 32 and causes the elastic part 32 to compress rapidly, driving the latch 3 to rotate and causing the engagement part 21 to separate from the locking part 41, releasing the restriction on the moving contact 4. Under the combined action of the elastic part 32 and the tension spring 5, the moving contact 4 is driven to separate from the stationary contact assembly 6, realizing the rapid short-circuit tripping of the circuit breaker.

[0036] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. An operating and tripping mechanism for a circuit breaker, characterized in that, include: Handle (1); A pull rod (2) is connected to the handle (1) and is used to transmit the rotational power of the handle (1). The end of the pull rod (2) away from the handle (1) is provided with a joint (21). The latch (3) is provided with a mating groove (31) and an elastic part (32), and the connecting part (21) is slidably installed in the mating groove (31). The moving contact (4) is rotatably connected to the circuit breaker housing via a rotating shaft. The moving contact (4) is provided with a locking part (41). The engaging part (21) passes through the mating groove (31) and abuts against the locking part (41). The moving contact (4) is connected to the elastic part (32) at the lower end of the latch (3). A tension spring (5), one end of which is fixed to the circuit breaker housing and the other end is connected to the moving contact (4); A stationary contact assembly (6) is disposed opposite to the moving contact (4) to form a conductive fit. The stationary contact assembly (6) includes a push rod (63). Under the action of external force, the handle (1) rotates clockwise to drive the pull rod (2), the moving contact (4), and the latch (3) to rotate clockwise synchronously until the moving contact (4) contacts the stationary contact assembly (6); the latch (3) continues to move backward a certain distance under the drive of the handle (1) until the handle (1) reaches the closed position, realizing the manual connection of the circuit breaker; When the circuit breaker is tripped, the handle (1) rotates counterclockwise under the action of external force, which drives the pull rod (2) to rotate synchronously. The pull rod (2) drives the moving contact (4) and the latch (3) to move. The tension spring (5) releases elastic potential energy to make the moving contact (4) and the latch (3) rotate counterclockwise around the axis of rotation quickly. The moving contact (4) separates from the stationary contact assembly (6) to realize the manual tripping of the circuit breaker. When the short-circuit current trips, the push rod (63) in the stationary contact assembly (6) pushes out, causing the latch (3) to move counterclockwise. At this time, the elastic part (32) is compressed, the mating groove (31) separates from the engaging part (41), releasing the restriction on the engaging part (21). The elastic part (32) of the latch (3) and the tension spring (5) release elastic potential energy, causing the moving contact (4) to rotate counterclockwise around the axis quickly. The moving contact (4) separates from the stationary contact assembly (6), realizing the rapid disconnection of the circuit breaker.

2. The operation and tripping mechanism of the circuit breaker according to claim 1, characterized in that, The circuit breaker's operation and tripping mechanism also includes a bimetallic rod (8) and a bimetallic strip (9). The latch (3) is also provided with a mating part (33), one end of the bimetallic rod (8) is embedded in the mating part (33), and the other end is connected to the free end of the bimetallic strip (9). The fixed end of the bimetallic strip (9) is fixed to the circuit breaker housing. When the circuit is overloaded while the circuit is in the closed state, the bimetallic strip (9) bends and deforms with the temperature rise and pushes the bimetallic rod (8). The bimetallic rod (8) transmits the thrust to the latch (3) so that the joint (21) separates from the locking part (41), releasing the limit on the moving contact (4). The tension spring (5) releases the elastic potential energy to drive the moving contact (4) to rotate counterclockwise and separate from the stationary contact assembly (6), forming the circuit breaker overload tripping.

3. The operation and tripping mechanism of the circuit breaker according to claim 2, characterized in that, The bimetallic sheet (9) has a thermal bimetallic composite layered structure.

4. The operation and tripping mechanism of the circuit breaker according to claim 2, characterized in that, The stationary contact assembly (6) includes an electromagnetic tripping structure, which includes a coil (61) and an iron core (62). The coil (61) is coaxially wound on the outside of the iron core (62), and the push rod (63) passes through the axial through hole of the iron core (62) and is arranged opposite to the elastic part (32).

5. The operation and tripping mechanism of the circuit breaker according to claim 1, characterized in that, The matching slot (31) is a strip-shaped through hole structure, which is opened along the length direction of the buckle (3).

6. The operation and tripping mechanism of the circuit breaker according to claim 1, characterized in that, The moving contact (4) is an integral stamped structure, including a hinge part (42), a conductive part (43) and a linkage part (44). The hinge part (42) has a shaft hole and forms a rotational fit with the rotating shaft of the circuit breaker housing. The conductive part (43) is used to form a conductive fit with the stationary contact assembly (6). The linkage part (44) is connected to the tension spring (5).

7. The circuit breaker operation and tripping mechanism according to claim 6, characterized in that, Both ends of the tension spring (5) are integrally formed with hook structures. One end of the tension spring (5) hooks and the protrusions on the circuit breaker housing form a hook engagement, and the other end hooks and the linkage part (44) form a hook engagement.

8. The circuit breaker operation and tripping mechanism according to claim 6, characterized in that, The conductive part (43) of the moving contact (4) is welded with a silver-based alloy contact.

9. The operation and tripping mechanism of the circuit breaker according to claim 1, characterized in that, The handle (1) and the pull rod (2) are connected by a pin or a snap fastener.

10. The operation and tripping mechanism of the circuit breaker according to claim 1, characterized in that, The latch (3) has a hinge hole (34) on its body, and the latch (3) rotates with the hinge pin on the circuit breaker housing through the hinge hole (34).

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