circuit breaker

Abstract

The circuit breaker comprises an operating mechanism and a contact unit, the contact unit comprises a moving contact assembly and a static contact, the operating mechanism comprises a linkage lever, a support, a rocker assembly, a trip, a lock and a reclose pivotally arranged on the support respectively, a main spring arranged between the rocker assembly and the linkage lever, a first crank pivotally arranged on the trip and in position cooperation with the trip and the linkage lever, and the linkage lever is connected with the contact through a transmission assembly; the circuit breaker further comprises a quick operation structure, the quick operation structure comprises a first push rod, a second push rod and a third push rod, the first push rod is pivotally arranged and is in driving cooperation with the moving contact and the second push rod respectively, the second push rod is pivotally arranged and is fixedly connected with the third push rod, and the reclose is provided with a reclose driven arm in driving cooperation with a driving part of the third push rod; the circuit breaker of the present application has the advantages that the transmission level of the quick operation structure is reduced, the reclose of the operating mechanism is driven by the quick operation structure, the moving contact is driven through the quick transmission of various components, and the quick operation of the reclose is realized.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and more specifically to a circuit breaker. Background Technology

[0002] Most existing molded case circuit breakers use the coordinated action of each component of the trip unit during a short circuit to transmit the tripping action to the re-tripping action one by one, thus achieving short circuit tripping protection. However, this results in excessively long disconnection time, and the operating mechanism has a complex structure, slow transmission, and long tripping time. Summary of the Invention

[0003] The purpose of this invention is to overcome at least one defect of the prior art and provide a circuit breaker.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A circuit breaker includes an operating mechanism and at least one contact unit. The contact unit includes a moving contact assembly and a stationary contact. The moving contact assembly includes a contact support and a moving contact disposed on the contact support. A contact spring is provided between the moving contact and the contact support. The operating mechanism includes a linkage rod, a bracket, a rocker arm assembly, a trip latch, a locking latch, and a re-latch, all pivotally mounted on the bracket. A main spring is disposed between the rocker arm assembly and the linkage rod. A first crank is pivotally mounted on the trip latch and engages with the trip latch and the linkage rod for limiting. The linkage rod is linked to the contact support via a transmission assembly. The circuit breaker also includes a quick-acting structure, which includes a first push rod, a second push rod, and a third push rod. The first push rod is pivotally mounted and drives the moving contact and the second push rod, respectively. The second push rod is pivotally mounted and fixedly connected to the third push rod, causing the second and third push rods to rotate synchronously. The third push rod has a third push rod drive part for driving the operating mechanism to trip. The re-latch has a re-latch receiving arm that drives the third push rod drive part.

[0006] During opening / closing, rotating the rocker arm assembly drives the linkage rod via the main spring. The linkage rod drives the moving contact to rotate, opening and closing the moving contact with the stationary contact. Simultaneously, the linkage rod drives the trip latch via the first crank. The trip latch and the latch remain locked, and the latch also remains locked with the re-latch. When the moving contact is electrically repelled by a short-circuit current, the moving contact rotates, acting on the first push rod. This causes the first push rod to rotate and act on the second push rod. The third push rod rotates with the second push rod and acts on the re-latch receiving arm via the third push rod drive unit. This drives the re-latch to rotate until it unlocks the latch. The latch then rotates until it unlocks the trip latch, causing the trip latch to rotate. This drives the linkage rod to rotate the moving contact, disconnecting the moving contact from the stationary contact.

[0007] Preferably, the re-clamp includes a re-clamp mounting part, which is pivotally mounted on the bracket via a re-clamp pivot. One side of the re-clamp mounting part is provided with a re-clamping feature that engages with the lock, and the other side is provided with a re-clamping driven arm. The end bevel of the re-clamping driven arm is used to engage with the third push rod driving part. The middle part of the re-clamping driven arm is provided with a re-clamping limiting feature for limiting the re-clamping rotation angle. The bracket is provided with a bracket stop boss that engages with the re-clamping limiting feature.

[0008] Preferably, the third push rod includes a coupling part, a third push rod connecting part, and a third push rod driving part connected in sequence, and the coupling part is provided with a coupling hole that engages with the coupling boss at the end of the second push rod.

[0009] Preferably, the moving contact assembly and the stationary contact are disposed within the unit housing. The moving contact and the first push rod are pivotally disposed on the contact support, and the second push rod is rotatably disposed within the unit housing and is provided with a coupling boss extending outside the unit housing and fixedly connected to the third push rod.

[0010] Preferably, the second push rod is a circular shaft structure, which is rotatably engaged with the two side walls of the unit housing. Both ends of the second push rod are provided with coupling bosses that are fixedly connected to the third push rod. The middle part of the circular shaft structure is provided with a second push rod driven part that protrudes to one side, and the second push rod driven part is engaged with the first push rod.

[0011] Preferably, one end of the first push rod is pivotally mounted, and the other end of the first push rod is a first push rod mating end. The first push rod mating end has a first push rod receiving surface on one side and a first push rod driving surface on the other side. The moving contact is provided with a moving contact driving part that drives and engages with the first push rod receiving surface. The second push rod is provided with a second push rod receiving part that drives and engages with the first push rod driving surface. The moving contact and the first push rod are pivotally mounted on the contact support of the moving contact assembly. When the circuit is closed, the first push rod rotates with the contact support until the first push rod mating end is located between the moving contact driving part and the second push rod receiving part. The first push rod receiving surface is opposite to and spaced apart from the moving contact driving part, and the first push rod driving surface is opposite to and spaced apart from the second push rod receiving part.

[0012] Preferably, the latch includes a locking plate, the top of the locking plate has a protruding latch feature for engaging with a re-latch locking feature, the bottom of the locking plate has a recessed latch feature for engaging with a jump latch locking feature, and the bottom of the locking plate also has latch mounting feet on both sides, the latch mounting feet being pivotally mounted on the bracket via a latch pivot.

[0013] Preferably, the first crank has three corners. The first corner of the first crank is pivotally mounted on the jumper via the first crank shaft. The second corner of the first crank is provided with a first crank limiting part that cooperates with the jumper limiting part. The third corner of the first crank is provided with a limiting notch that cooperates with the linkage rod limiting part.

[0014] Preferably, one end of the jump buckle is pivotally mounted on the bracket via a jump buckle pivot, and the other end of the jump buckle has a protruding jump buckle lock feature for locking with the lock. The middle part of the jump buckle, located between the jump buckle pivot and the first crank pivot, has a jump buckle limiting part for limiting with the first crank.

[0015] Preferably, the moving contact is pivotally mounted on the contact support of the moving contact assembly via a contact shaft, and the linkage rod is linked with the contact support via a transmission assembly, driving the contact support and the moving contact to rotate around the contact shaft;

[0016] The transmission assembly includes a first connecting rod, a second connecting rod, and a second crank. The second crank has three corners. One end of the first connecting rod is hinged to the linkage rod. The two ends of the second connecting rod are respectively hinged to the other end of the first connecting rod and the first corner of the second crank. The second corner of the second crank is pivotally mounted on the contact shaft, and the third corner of the second crank is hinged to the transmission shaft.

[0017] Preferably, the moving contact assembly further includes a connecting plate and a conductive pad. One end of the moving contact is a contact portion for engaging with the stationary contact, and the other end of the moving contact is a moving contact mounting portion that extends into a receiving groove for contact support. The connecting plate has two connecting plate mounting portions that extend into the receiving groove for contact support. The moving contact mounting portion is rotatably disposed between the two connecting plate mounting portions. Each side of the moving contact mounting portion is connected to the two connecting plate mounting portions through a conductive pad, and the conductive pad is in sliding engagement with the moving contact.

[0018] Preferably, one side of the conductive pad is in contact with the connecting plate, and the other side of the conductive pad is a convex curved surface. The moving contact is provided with a curved groove that slides with the convex curved surface.

[0019] In the circuit breaker of the present invention, when the circuit breaker is short-circuited, the moving contact springs open due to electric repulsion, triggering the quick-acting structure to trip the operating mechanism, thereby achieving the purpose of tripping the operating mechanism before the instantaneous tripping unit. The quick-acting structure of this embodiment is simple, with only a first push rod and a fixedly connected second and third push rod. The second and third push rods rotate synchronously, reducing transmission elements and thus reducing the number of transmission stages, making the transmission faster, more stable and reliable, and realizing the rapid tripping of the operating mechanism in the event of a short circuit. Moreover, after the operating mechanism is driven by the quick-acting structure, the moving contact is driven by the fast transmission through the cooperation between the locking latch, the jumping latch and the first crank and the linkage rod, realizing the rapid execution of the tripping action.

[0020] In addition, the moving contact mounting part and the connecting plate mounting part are connected by a conductive gasket to achieve a sliding hard connection between the moving contact and the connecting plate. Without affecting the resistance of the moving contact assembly, the contact area is reduced, the rotational friction between the connecting plate and the moving contact is reduced, the moving contact rotates more smoothly, and the product requires less operating force.

[0021] In addition, the sliding structure between the conductive pad and the moving contact adopts a sliding fit convex surface and curved groove, which is simple in structure and the arc contact effectively reduces rotational friction, making the rotation more flexible; in addition, the less friction, the less wear, and the longer the service life.

[0022] In addition, the second push rod and the third push rod are fixedly connected by a snap-fit ​​coupling structure, which facilitates assembly and mating with the unit housing.

[0023] In addition, the structural design of the third push rod allows it to rotate synchronously with the second push rod, and also extends to directly engage with the re-clamp, reducing intermediate transmission and improving the disengagement speed of the operating mechanism.

[0024] In addition, the first push rod adopts a single-sided swing structure with one end pivoting and the other end swinging. The first push rod is simultaneously driven by the moving contact and the driving operation mechanism. Compared with the rocker-type rotating structure with the middle pivoting and both ends swinging, the structure is simpler, the operation is simpler and more reliable, the structure is compact, and there is no interference between them. Attached Figure Description

[0025] Figure 1 This is a schematic diagram showing the assembly relationship between the operating mechanism and the two contact units of the present invention;

[0026] Figure 2 This is an exploded view of the fast-moving structure of the present invention;

[0027] Figure 3 This is a perspective view of the operating mechanism and contact unit of the present invention in the closed state;

[0028] Figure 4 This is a perspective view of the operating mechanism and contact unit of the present invention with the support hidden in the closed state;

[0029] Figure 5 This is a front view of the operating mechanism and contact unit in the closed state of the present invention;

[0030] Figure 6 This is a cross-sectional view of the operating mechanism and contact unit in the closed state of the present invention;

[0031] Figure 7 This is a front view of the operating mechanism and contact unit of the present invention in the state of imminent tripping;

[0032] Figure 8This is a cross-sectional view of the operating mechanism and contact unit of the present invention in the state of imminent tripping;

[0033] Figure 9 This is a front view of the operating mechanism and contact unit in the tripped state of the present invention;

[0034] Figure 10 This is a cross-sectional view of the operating mechanism and contact unit in the tripped state of the present invention;

[0035] Figure 11 This is a front view of the operating mechanism and contact unit in the open state of the present invention;

[0036] Figure 12 This is a cross-sectional view of the operating mechanism and contact unit in the open state of the present invention;

[0037] Figure 13 This is a schematic diagram of the contact support structure of the present invention;

[0038] Figure 14 This is a schematic diagram of the moving contact assembly and the first push rod of the present invention;

[0039] Figure 15 This is a schematic diagram of the quick-moving structure of the present invention;

[0040] Figure 16 This is the present invention. Figure 15 Enlarged view of point A in the middle;

[0041] Figure 17 This is a schematic diagram of the structure of the hidden support operating mechanism of the present invention;

[0042] Figure 18 This is a schematic diagram of the re-fastening structure of the present invention;

[0043] Figure 19 This is a schematic diagram of the locking mechanism of the present invention;

[0044] Figure 20 This is an assembly diagram of the jumper and the first crank of the present invention;

[0045] Figure 21 This is an assembly diagram of the moving contact assembly of the present invention;

[0046] Figure 22 This is an exploded view of the moving contact assembly of the present invention;

[0047] Moving contact assembly 10; connecting plate 11; connecting plate mounting part 11a; connecting plate wiring part 11b; compression spring 110; conductive gasket 12; convex curved surface 12a; moving contact 13; contact part 13a; moving contact mounting part 13b; curved groove 13c; contact spring 130; torsion spring limiting groove 13d; moving contact drive part 13e; contact shaft 14; bushing 140; insulating tail wing 15; arc blocking part 15a; rivet 150; contact support 16; drive shaft 160; contact support connection part 16a; contact support mounting part 16b. Receiving groove 16c; Contact support limiting part 16h; First rotation limiting part 16i; Contact support abutment surface 16j; Arc blocking plate 17; Stationary contact 18; Unit housing 19; First rotation limiting part 19d; First push rod 21; First push rod driven surface 21a; First push rod driving surface 21b; First push rod protrusion 21c; First push rod mounting part 21d; First push rod spring hole 21e; ​​First push rod pivot 22; First push rod spring 23; Second push rod 24; Coupling boss 24a; Second push rod driven part 24b; Second push rod limiting part Part 24c; Third push rod 25; Third push rod drive part 25a; Third push rod connecting part 25b; Third push rod spring hole 25c; Coupling part 25d; Coupling hole 25e; Third push rod spring 26; Linkage rod 30; Main spring 31; Bracket 40; Bracket side plate 41; Bracket stop boss 41a; Fixed shaft 42; Rocker arm assembly 50; Handle 51; Rocker arm 52; Rocker arm pivot 521; Lock 60; Lock pivot 61; Lock spring 62; Lock lock feature 60a; Lock latch feature 60b; Locking plate 60c; Lock abutment Surface 60d; Locking mounting foot 60e; Jump lock 70; First crank 71; Limiting notch 71a; First crank shaft 710; First crank limiting part 711; Jump lock shaft 72; Jump lock feature 70a; Re-lock 80; Re-lock shaft 81; Re-lock spring 82; Re-lock feature 80a; Re-lock driven arm 80b; Re-lock limiting feature 80c; End bevel 80d; Re-lock mounting part 80e; Re-lock connecting rod 80f; Re-lock abutment platform 80g; Transmission assembly 90; First connecting rod 91; Second connecting rod 92; Second crank 93. Detailed Implementation

[0048] The following embodiments, in conjunction with the accompanying drawings, further illustrate specific implementations of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the descriptions in the following embodiments.

[0049] like Figure 1-12As shown, the circuit breaker in this embodiment is a molded case circuit breaker, including a circuit breaker housing, an operating mechanism, and at least one contact unit. Each contact unit includes a unit housing 19 and a moving contact assembly 10 and a stationary contact 18 disposed within the unit housing 19. The unit housing 19 may also be provided with an arc-extinguishing chamber for extinguishing the electric arc generated during the opening and closing of the moving contact 13 and the stationary contact 18. In this embodiment, the moving contact assembly 10 includes a contact support 16 and a moving contact 13. The contact support 16 and the moving contact 13 are pivotally mounted on the same contact shaft 14. The operating mechanism drives the contact support 16 through a transmission shaft 160, causing the contact support 16 and the moving contact 13 to rotate around the contact shaft 14, thereby driving the moving contact 13 to open or close with the stationary contact 18.

[0050] The circuit breaker in this embodiment is also equipped with an instantaneous trip unit and a delayed trip unit. The instantaneous trip unit is usually an electromagnetic trip unit, which triggers the operating mechanism to trip when a short-circuit fault occurs. The delayed trip unit is usually a bimetallic strip, which triggers the operating mechanism to trip when an overload fault occurs. The instantaneous trip unit and the delayed trip unit usually act on a traction rod that is rotatably installed in the circuit breaker housing. The traction rod acts on the re-clamping of the operating mechanism, causing the operating mechanism to trip and drive the moving contact 13 to disconnect from the stationary contact 18 to achieve circuit protection.

[0051] In this embodiment, the contact units serve as the phase poles of the molded case circuit breaker. Several units can be configured. The drive shaft 160 passes through the contact supports 16 and the unit housing 19 of multiple contact units, allowing multiple contact units to share the same drive shaft 160. This enables a single operating mechanism to simultaneously drive the contact supports 16 of multiple contact units. Preferably, three contact units are provided, arranged side-by-side, and can be connected to three-phase power. The moving contact 13 is electrically connected to the connecting plate 11, and the stationary contact 18 can be mounted on a terminal block. The contact units are connected via the connecting plate 11 and the terminal block. Of course, in other embodiments, the contact units within the molded case circuit breaker can be one, two, or more; the contact units may not have a unit housing 19, and a partition can be installed inside the circuit breaker housing to separate the contact units; furthermore, the contact supports 16 and the moving contact 13 may not be mounted on the same contact shaft 14, etc. Figure 13 As shown, in this embodiment, the moving contact assembly 10 includes a contact support 16 comprising a contact support connecting portion 16a and two symmetrically arranged contact support mounting portions 16b. The contact support connecting portion 16a is connected between the two contact support mounting portions 16b to form a receiving groove 16c. The receiving groove 16c of the contact support 16 has two spaced-apart contact support limiting portions 16h at the end away from the stationary contact 18. One of the contact support limiting portions 16h has a contact support abutment surface 16j. The contact support mounting portion 16b is similar to an arc-shaped plate structure, and its top surface is curved.

[0052] like Figure 14 As shown, one end of the moving contact 13 cooperates with the stationary contact 18 and has a torsion spring limiting groove 13d. The other end of the moving contact 13 is a circular plate-like structure and is pivotally mounted in the receiving groove 16c of the contact support 16. A contact spring 130 is provided between the moving contact 13 and the contact support 16. The contact spring 130 elastically fixes the moving contact 13 and the contact support 16. The moving contact 13 rotates synchronously with the contact spring 130 and can also rotate relative to the contact spring 130. In this embodiment, the contact spring 130 is a torsion spring. The contact spring 130 has two spring bodies, which are respectively sleeved on the contact shaft 14. The straight sections at one end of the two spring bodies abut against both sides of the contact support connecting part 16a. The other ends of the two spring bodies are connected by a U-shaped section, which is inserted into the torsion spring limiting groove 13d. During normal opening / closing, the moving contact 13 rotates synchronously with the contact support 16. When the moving contact 13 contacts the stationary contact 18, it rotates relative to the contact support 16, achieving overtravel through the contact spring 130. When a large short-circuit current flows through the moving contact 13 and the stationary contact 18, the electric repulsion between the moving contact 13 and the stationary contact 18 increases, causing the moving contact 13 to overcome the force applied by the contact spring 130 and rotate relative to the contact support 16 around the contact axis 14. The moving contact 13 is then electrically repelled.

[0053] like Figure 1-12 As shown, the quick-acting structure of this embodiment includes an operating mechanism, a moving contact assembly 10, and a stationary contact 18. It also includes a first push rod 21, a second push rod 24, and a third push rod 25. The first push rod 21 is pivotally mounted and rotatable around a first push rod pivot 22. The first push rod 21 is driven and engaged with the moving contact 13 and the second push rod 24 respectively. The second push rod 24 is pivotally mounted and fixedly connected to the third push rod 25, causing the second push rod 24 and the third push rod 25 to rotate synchronously. The third push rod 25 is provided with a third push rod driving part 25a for driving the operating mechanism to trip. When the moving contact 13 is electrically repelled by a short-circuit current, the moving contact 13 rotates, acting on the first push rod 21, causing the first push rod 21 to rotate and act on the second push rod 24. The third push rod 25 rotates with the second push rod 24 and drives the operating mechanism to trip via the third push rod driving part 25a. Figure 9-10 As shown. One improvement of this application is that when the circuit breaker is short-circuited, the electric repulsive force is large, and the moving contact 13 springs open due to the electric repulsive force, triggering the quick-acting structure to trip the operating mechanism, thereby achieving the purpose of tripping the operating mechanism before the instantaneous tripping unit. The quick-acting structure of this embodiment is simple, with only a first push rod 21 and a fixedly connected second push rod 24 and third push rod 25. The second push rod 24 and third push rod 25 rotate synchronously, reducing the number of transmission elements, thereby reducing the number of transmission stages, making the transmission faster, more stable and reliable, and realizing the rapid tripping of the operating mechanism.

[0054] like Figure 6 As shown, one end of the first push rod 21 is pivotally mounted, and the other end of the first push rod 21 is a first push rod mating end. The first push rod mating end is driven and mated with the moving contact 13 and the second push rod 24. In this embodiment, the first push rod 21 adopts a single-sided swing structure with one end pivoting and the other end swinging. The first push rod mating end is simultaneously driven by the moving contact 13 and the driving operating mechanism. Compared with the rocker-type rotating structure with the middle pivoting and both ends swinging, the structure is simpler, the operation is simpler and more reliable, the structure is compact, and there is no interference between them. Preferably, the first push rod mating end has a first push rod receiving surface 21a on one side and a first push rod driving surface 21b on the other side. The moving contact 13 has a moving contact driving part 13e at the end away from the stationary contact 18 that is driven and mated with the first push rod receiving surface 21a; the second push rod 24 has a second push rod receiving part 24b that is driven and mated with the first push rod driving surface 21b. The receiving and driving parts of the first push rod 21 are two sides of the same end, which simplifies the structure of the first push rod 21.

[0055] In this embodiment, the first push rod 21 has a pivoting structure. The first push rod 21 can be mounted on the unit housing 19, that is, it is always mounted opposite to the second push rod 24. The first push rod 21 can also be mounted on the contact support 16 and rotate together with the moving contact 13 along with the contact support 16.

[0056] like Figure 14 As shown, in this embodiment, the first push rod 21 is pivotally mounted in the receiving groove 16c on the contact support 16 via a first push rod pivot 22. Specifically, the first push rod pivot 22 passes through the first push rod 21 and the contact support 16, and the first push rod 21 and the contact support 16 are provided with shaft holes that mate with the first push rod pivot 22. During closing, the first push rod 21 rotates with the contact support 16 until the first push rod mating end is located between the moving contact driving part 13e and the second push rod driven part 24b. In the normal closing state, there is no contact between the first push rod mating end and the moving contact driving part 13e and the second push rod driven part 24b. The first push rod driven surface 21a is opposite to and spaced apart from the moving contact driving part 13e, while the first push rod driving surface 21b is opposite to and spaced apart from the second push rod driven part 24b. This prevents the first push rod 21 from easily malfunctioning and avoids affecting the operating mechanism. Preferably, the first push rod receiving surface 21a and the first push rod driving surface 21b are planar, while the moving contact driving part 13e and the second push rod receiving part 24b are protruding structures. The fit between the first push rod 21, the moving contact 13, and the second push rod receiving part 24b is simple and easy to manufacture.

[0057] like Figure 14As shown, in this embodiment, the first push rod 21 and the contact support 16 have a mating structure. A first push rod spring 23 for resetting the first push rod 21 is provided between the first push rod 21 and the contact support 16. The first push rod spring 23 is sleeved on the first push rod shaft 22. Both ends of the first push rod spring 23 are connected to the first push rod 21 and the contact support 16. Specifically, one end of the first push rod spring 23 is hung in the first push rod spring hole 21e, and the other end abuts against the contact support abutment surface 16j. Before installing the first push rod 21 in the contact support 16, one end 23a of the first push rod spring 23 is hung in the first push rod spring hole 21e. The first push rod spring 23 and the shaft hole on the first push rod mounting part 21d for rotating with the first push rod shaft 22 are kept as coaxial as possible to facilitate subsequent coaxial installation. The first push rod 21 and the first push rod spring 23 are sleeved on the first push rod shaft 22 and arranged side by side between the two contact support limiting parts 16h. The first push rod 21 has a first push rod mounting part 21d for pivoting. The first push rod mounting part 21d is a circular block structure. Its first end extends radially in a direction perpendicular to the axial direction of the first push rod shaft 22 to form the first push rod mating end. The first push rod mating end is provided with a first push rod spring hole 21e. The side wall of the first push rod mounting part 21d is provided with a first push rod protrusion 21c for limiting the rotation angle of the first push rod 21. The second end of the first push rod mounting part 21d is attached to the corresponding contact support limiting part 16h. The contact support limiting part 16h is provided with a rotation limiting part 16i that abuts against the first push rod protrusion 21c.

[0058] like Figure 2 As shown, the second push rod 24 is rotatably disposed within the unit housing 19, and has a coupling boss 24a extending outside the unit housing 19 and fixedly connected to the third push rod 25, so that the second push rod 24 and the third push rod 25 rotate synchronously. The unit housing 19 has a rotating hole that rotatably engages with the second push rod 24. The third push rod 25 is disposed on the outside of the unit housing 19 and drives and engages with the re-clamp 80 of the operating mechanism. The re-clamp 80 has a re-clamping arm 80b that drives and engages with the third push rod 25. When the molded case circuit breaker has multiple contact units, each contact unit has one second push rod 24, and there is one third push rod 25 between every two adjacent contact units. A third push rod 25 can be coupled simultaneously to the second push rods 24 in the two contact units on both sides.

[0059] like Figure 2 As shown, the second push rod 24 is a circular shaft structure. The circular shaft structure of the second push rod 24 is rotatably engaged with the two side walls of the unit housing 19. Both ends of the second push rod 24 are provided with coupling bosses 24a that are fixedly connected to the third push rod 25. The central part of the circular shaft structure has a second push rod driven part 24b that protrudes to one side, and the second push rod driven part 24b is driven by the first push rod 21. Figures 15-16 As shown, the second push rod 24 is provided with a second push rod limiting part 24c for limiting the rotation angle of the second push rod 24, and the unit housing 19 is provided with a first rotation limiting part 19d that abuts against the second push rod limiting part 24c.

[0060] like Figure 2 As shown, the third push rod 25 includes a coupling part 25d, a third push rod connecting part 25b, and a third push rod driving part 25a connected in sequence. The coupling part 25d is a circular block structure that can be connected to the end of the second push rod 24, and has a coupling hole 25e that engages with the coupling boss 24a at the end of the second push rod 24. The coupling boss 24a of the second push rod 24 engages in the coupling hole 25e of the third push rod 25, thereby realizing that the third push rod 25 rotates synchronously when the second push rod 24 rotates. The third push rod connecting part 25b is a sheet-like structure perpendicular to the axial direction of the coupling part 25d, and has a third push rod spring hole 25c for hanging the third push rod spring 26. One end of the third push rod spring 26 is hung in the third push rod spring hole 25c, and the other end is fixedly mounted, for example, on a connecting shaft for connecting multiple contact units. The third push rod drive part 25a is an L-shaped bent structure perpendicular to the third push rod connecting part 25b. The third push rod drive part 25a is driven and engaged with the re-clamping driven arm 80b, which is located on the concave side of the bent structure. The structural design of the third push rod 25 in this embodiment allows it to rotate synchronously with the second push rod 24, and also to extend to directly engage with the re-clamp 80, reducing intermediate transmission and improving the disengagement speed of the operating mechanism. In this embodiment, the second push rod 24 and the third push rod 25 are fixedly connected by a snap-fit ​​coupling structure, which facilitates assembly and engagement with the unit housing 19. Of course, in other embodiments, an integral setting or other fixed connection methods can also be used.

[0061] like Figure 1 and Figure 17As shown, the operating mechanism of this embodiment includes a linkage rod 30, a bracket 40, a rocker arm assembly 50, a jump buckle 70, a lock buckle 60 and a re-lock buckle 80 respectively pivotally mounted on the bracket 40, a main spring 31 disposed between the rocker arm assembly 50 and the linkage rod 30, and a first crank 71 pivotally mounted on the jump buckle 70 and limitedly engaged with the jump buckle 70 and the linkage rod 30. The linkage rod 30 is linked with the moving contact 13 through a transmission assembly 90. During opening / closing, the rocker arm assembly 50 is rotated, which drives the linkage rod 30 via the main spring 31. The linkage rod 30 drives the moving contact 13 to rotate via the transmission assembly 90, causing the moving contact 13 to open and close with the stationary contact 18. At the same time, the linkage rod 30 drives the trip latch 70 via the first crank 71. The trip latch 70 and the locking latch 60 remain in the locked state, and the locking latch 60 also remains in the locked state with the re-latch 80. During tripping, the moving contact 13 is electrically repelled by a large current, causing the first push rod 21 to push the second push rod 24. The third push rod 25 rotates with the second push rod 24 and passes through the third push rod drive part 25a. The action acts on the re-clamping arm 80b, driving the re-clamp 80 to rotate around the re-clamping shaft 81 until it unlocks from the latch 60. The latch 60 then rotates around the latching shaft 61 until it unlocks from the jump latch 70, causing the jump latch 70 to rotate around the jump latching shaft 72. This drives the linkage rod 30 to rotate the moving contact 13, disengaging the moving contact 13 from the stationary contact 18. When re-clamping, rotating the rocker arm assembly 50 resets the jump latch 70. The latch 60, under the action of the latching spring 62, rotates back to lock with the jump latch 70. The re-clamp 80, under the action of the re-clamping spring 82, rotates back to lock with the latch 60. Another improvement of this application is that, after the re-clamp 80 of the operating mechanism is driven by the quick-acting structure, the moving contact 13 is driven by the rapid transmission through the cooperation between the latch 60, the jump latch 70, the first crank 71, and the linkage rod 30, achieving rapid execution of the disengagement action.

[0062] The locking structure between the snap fastener 70, the locking buckle 60, and the re-buckle 80 in this embodiment is as follows: Figure 6 As shown, the snap fastener 70 is provided with a snap fastener locking feature 70a, and the latch 60 is provided with a latching feature 60b that engages with the snap fastener locking feature 70a. Figure 2 As shown, the latch 60 is further provided with a latch lock feature 60a, and the re-latch 80 is provided with a re-latch feature 80a that engages with the latch lock feature 60a. Figure 6 or Figure 12 As shown, during normal opening / closing, the trip latch feature 70a holds the latch on the locking latch feature 60b, keeping the trip latch 70 and the locking latch 60 in a locked state. The re-clamp feature 80a holds the latch on the locking latch feature 60a, keeping the locking latch 60 and the re-clamp 80 in a locked state. There is pressure between the contact surfaces of the re-clamp feature 80a and the locking latch feature 60a. At the same time, the re-clamp driven arm 80b is in contact with the third push rod drive part 25a, but the pressure between the contact surfaces is very small or close but not in contact. Figure 10As shown, when the latch fails, the third push rod drive unit 25a pushes the re-latch driven arm 80b, and the re-latch 80 rotates to disengage the re-latch feature 80a from the latch lock feature 60a, thereby unlocking the re-latch 80 and the latch 60. The latch 60 rotates to disengage the latch feature 60b from the jump latch lock feature 70a, thereby unlocking the latch 60 and the jump latch 70.

[0063] like Figure 1 and Figure 17 As shown, the bracket 40 in this embodiment includes two bracket side plates 41 and at least two fixed shafts 42. The jump-lock shaft 72, the locking shaft 61, and the re-lock shaft 81 are respectively vertically connected between the two bracket side plates 41. When the molded case circuit breaker has three contact units, the two bracket side plates 41 are located on both sides of the middle contact unit and are fixed through the fixed shafts 42. The two ends of the fixed shafts 42 also pass through the two contact units on both sides to achieve fixed installation between the bracket 40 and the three contact units.

[0064] like Figure 1 and Figure 17 As shown, the rocker arm assembly 50 of this embodiment includes a handle 51 and a rocker arm 52 fixedly connected. The rocker arm 52 has an inverted U-shaped structure with a closed top and an open bottom. The top of the rocker arm 52 is fixedly connected to the handle 51 by a fixing rod. Each arm of the rocker arm 52 is pivotally mounted on the two support side plates 41 of the bracket 40 via a rocker arm pivot 521. Rotating the handle 51 causes the rocker arm 52 to rotate around the rocker arm pivot 521. A rocker arm spring for resetting the rocker arm 52 is provided between the rocker arm 52 and the bracket 40. The linkage rod 30 is vertically arranged between the two arms of the U-shaped rocker arm 52. The two ends of the main spring 31 are respectively connected to the fixing rod and the linkage rod 30.

[0065] like Figure 17-18 As shown, the re-clamp 80 in this embodiment is an integrally formed structure, including a re-clamp mounting part 80e. The re-clamp mounting part 80e is pivotally mounted on the bracket 40 via a re-clamp pivot 81. One side of the re-clamp mounting part 80e is provided with a re-clamping feature 80a that locks into the latch 60, and the other side is provided with a re-clamping driven arm 80b. The end slope 80d of the re-clamping driven arm 80b is used for driving engagement with the third push rod driving part 25a. The middle part of the re-clamping driven arm 80b is provided with a re-clamping limiting feature 80c for limiting the rotation angle of the re-clamp 80. The bracket 40 is provided with a bracket stop boss 41a that abuts against the re-clamping limiting feature 80c. Optionally, as... Figure 1 , Figure 18As shown, the quick-action structure has two third push rods 25. Correspondingly, the re-clamp 80 has two re-clamping driven arms 80b. The two re-clamping driven arms 80b are connected by a re-clamping connecting rod 80f. One of the re-clamping driven arms 80b is provided with the re-clamping limiting feature 80c, and the other re-clamping driven arm 80b is provided with a re-clamping abutment platform 80g. One end of the re-clamping spring 82 is connected to the re-clamping abutment platform 80g, and the other end is connected to the bracket 40.

[0066] like Figure 17 , Figure 19 As shown, the latch 60 in this embodiment is an integrally molded structure, including a locking plate 60c. The locking plate 60c has a latch abutment surface 60d facing the snap fastener 70. The top of the locking plate 60c has a protruding latch feature 60a for locking with the snap fastener feature 80a of the snap fastener 80. The bottom of the locking plate 60c has a recessed latch feature 60b for locking with the snap fastener 70. The bottom sides of the locking plate 60c also have latch mounting feet 60e, which are pivotally mounted on the bracket 40 via a latch pivot 61. Figure 1 , Figure 19 As shown, the latch mounting foot 60e is bent and connected to the locking plate 60c. The latch spring 62 is sleeved on the latch shaft 61, with one end abutting against the bent connection between the latch mounting foot 60e and the locking plate 60c, and the other end abutting against the unit housing 19 or the bracket 40.

[0067] like Figure 17 and Figure 20 As shown, the first crank 71 in this embodiment is an integrally formed triangular plate structure with three corners. The first corner of the first crank 71 is pivotally mounted on the jump buckle 70 through the first crank shaft 710. The second corner of the first crank 71 is provided with a first crank limiting part 711 that cooperates with the jump buckle 70. The third corner of the first crank 71 is provided with a limiting notch 71a that cooperates with the linkage rod 30.

[0068] like Figure 17 and Figure 20As shown, the jump buckle 70 is an integrally formed irregular plate structure. One end of the jump buckle 70 is pivotally mounted on the bracket 40 via the jump buckle pivot 72, and the other end of the jump buckle 70 has a protruding jump buckle locking feature 70a, which is used to lock and cooperate with the locking buckle feature 60b of the lock buckle 60. When the buckle is released, the jump buckle locking feature 70a disengages from the locking buckle feature 60b and abuts or faces the lock buckle contact surface 60d. The middle part of the jump buckle 70, located between the jump buckle pivot 72 and the first crank pivot 710, has a jump buckle limiting part, which is used to limit and cooperate with the first crank limiting part 711 of the first crank 71. Preferably, there are two first cranks 71, which are located on both sides of the jump buckle 70 and share the same first crank pivot 710. The first crank limiting part 711 is a round shaft structure, with both ends hinged to the second corner of the first crank 71. The jump buckle limiting part is a recessed structure provided on the bottom edge of the jump buckle 70. During normal opening / closing, the first crank limiting part 711 is placed inside the trip limit part, at which time the first crank 71 and the trip 70 are linked; when tripped, the first crank limiting part 711 disengages from the trip limit part, at which time the first crank 71 and the trip 70 can rotate relative to each other.

[0069] like Figure 1 , Figure 3-4 As shown, in this embodiment, the transmission assembly 90 is linked to the contact support 16 via the transmission shaft 160, driving the contact support 16 and the moving contact 13 to rotate around the contact shaft 14. The contact support 16 is hinged to the transmission shaft 160. The transmission assembly 90 includes a first connecting rod 91, a second connecting rod 92, and a second crank 93. The second crank 93 is similar to a triangular plate structure with three corners. One end of the first connecting rod 91 is hinged to the linkage rod 30. The two ends of the second connecting rod 92 are respectively hinged to the other end of the first connecting rod 91 and the first corner of the second crank 93. The second corner of the second crank 93 is pivotally mounted on the contact shaft 14, and the third corner of the second crank 93 is hinged to the transmission shaft 160.

[0070] This embodiment describes the operation process of the molded case circuit breaker closing, tripping, and re-closing (opening).

[0071] During the closing process, the rocker arm 52 rotates counterclockwise, the main spring 31 pulls the first crank 63 and the first connecting rod 91 to rotate, and the second crank 93 rotates around the contact shaft 14, driving the contact support 16 through the transmission shaft 160. The contact spring 130 presses the moving contact 13 onto the contact support 16, so the moving contact 13 and the contact support 16 rotate together. When the moving contact 13 contacts the stationary contact 18, the rotation of the moving contact 13 is hindered, and it presses against the stationary contact 18. The contact support 16 continues to rotate for a certain distance before stopping at the limit point. During this distance, the moving contact 13 and the contact support 16 generate relative displacement, and the moving contact drive part 13e of the moving contact 13 slides a certain distance on the first push rod receiving surface 21a of the first push rod 21, finally completing the closing process. Figure 3-6 As shown, the first push rod 21 will rotate at a certain angle, and the moving contact drive part 13e, the first push rod 21, and the second push rod 24 will appear as follows: Figure 4 and Figure 6 The positional relationship is shown.

[0072] When a large interrupting current flows through the moving contact 13 and the stationary contact 18, an electrodynamic repulsive force and a pneumatic repulsive force are generated between the moving contact 13 and the stationary contact 18. When the total repulsive force is greater than the force applied to the moving contact 13 by the contact spring 130, the moving contact 13 will gradually lift up. During the lifting process of the moving contact 13, the moving contact drive part 13e on it will apply a force to the first push rod receiving surface 21a, pushing the first push rod 21 to rotate clockwise. At the same time, the first push rod drive surface 21b on the other side of the first push rod 21 will apply pressure to the second push rod receiving part 24b, causing the second push rod 24 to rotate counterclockwise, driving the third push rod 25 coupled with the second push rod 24 to rotate by a certain angle. The third push rod drive part 25a pushes the re-clamp receiving arm 80b, causing the re-clamp 80 to rotate clockwise. Figure 7-8 The diagram shows the state where the re-clamping feature 80a is about to disengage from the locking feature 60a. As the moving contact 13 continues to lift, the re-clamping feature 80a will disengage from the locking feature 60a. The jump catch 70 is pulled by the main spring 31, causing the jump catch 70a to slide off the locking feature 60b. The jump catch 70 lifts, and the locking feature 60 rotates clockwise, causing the second crank 93 to rotate counterclockwise. The contact support 16 rotates accordingly, then collides with the moving contact 13 and rotates counterclockwise together to the limit point of the contact support 16, returning to the previous position. Figure 9-10 The tripped state is shown.

[0073] When the circuit changes from the tripped state to the re-engaged (open) state, the rocker arm 52 rotates clockwise, pressing down the trip latch 70. The latch 60 flips under the action of the latch spring 62, and the trip latch 70 rotates clockwise until the trip latch lock feature 70a and the latch latch feature 60b engage. Simultaneously, the first crank 63 and the first connecting rod 91 flip, while the second crank 93 remains in the same position, keeping the moving contact 13 in the open state. While the latch 60 flips, the re-engaged latch 80 rotates counterclockwise under the upward force of the re-engaged latch spring 82 until the re-engaged latch limit feature 80c touches the bracket stop boss 41a. Since the moving contact 13 is in the open state, the positional relationship of the first push rod 21, the second push rod 24, and the third push rod 25 also remains unchanged. Figure 11-12 As shown.

[0074] like Figure 21-22As shown, the moving contact assembly 10 of this embodiment also includes a connecting plate 11 and a conductive pad 12. One end of the moving contact 13 is a contact portion 13a for cooperating with the stationary contact 18, and the other end of the moving contact 13 is a moving contact mounting portion 13b that extends into the receiving groove 16c of the contact support 16. The connecting plate 11 has two connecting plate mounting portions 11a that extend into the receiving groove 16c of the contact support 16 and a connecting plate wiring portion 11b that extends out of the unit housing 19. The connecting plate wiring portion 11b is used for wiring the contact unit. The moving contact mounting portion 13b is rotatably disposed between the two connecting plate mounting portions 11a. Each side of the moving contact mounting portion 13b is connected to the two connecting plate mounting portions 11a through a conductive pad 12. The conductive pad 12 is slidably engaged with the moving contact 13. Another improvement in this application is that the moving contact mounting portion 13b and the connecting plate mounting portion 11a are connected by a conductive pad 12 to achieve a sliding hard connection between the moving contact 13 and the connecting plate 11. This reduces the contact area without affecting the resistance of the moving contact assembly 10, thereby reducing the rotational friction between the connecting plate 11 and the moving contact 13, making the moving contact 13 rotate more smoothly, and requiring less operating force. The moving contact assembly of this embodiment is suitable for molded case circuit breakers, and is also applicable to other switching equipment where a hard connection structure is used between the moving contact and the wiring components.

[0075] like Figure 22 As shown in the figure, the sliding structure between the conductive pad 12 and the moving contact 13 in this embodiment has one side of the conductive pad 12 in contact with the connecting plate 11, and the other side of the conductive pad 12 is a convex curved surface 12a. The moving contact 13 is provided with a curved groove 13c that slides with the convex curved surface 12a. The sliding structure between the conductive pad 12 and the moving contact 13 in this embodiment adopts a sliding fit convex curved surface 12a and curved groove 13c, which is simple in structure. The arc-shaped contact effectively reduces rotational friction, making rotation more flexible. In addition, the lower the friction, the less wear, and the longer the service life. Of course, the sliding structure between the conductive pad 12 and the moving contact 13 can also adopt a sliding fit structure such as a convex point and a groove.

[0076] Furthermore, such as Figure 21-22As shown, the moving contact assembly 10 in this embodiment also includes a compression spring 110. The moving contact mounting portion 13b and the two connecting plate mounting portions 11a are confined within the receiving groove 16c of the contact support 16 by the compression spring 110. The compression spring 110 is sleeved on the contact shaft 14 and pre-tightly positioned between the connecting plate mounting portion 11a and the wall of the receiving groove 16c. Specifically, two compression springs 110 are provided, with one compression spring 110 between each connecting plate mounting portion 11a and the corresponding contact support mounting portion 16b. The moving contact 13, conductive pad 12, connecting plate 11, compression spring 110, and contact support 16 are connected together by the contact shaft 14. The compression spring 110 is compressed to provide clamping force, which clamps the connecting plate 11 with the conductive pad 12 and the moving contact 13, increasing the contact pressure among the three and improving the reliability of electrical contact. The use of an elastic limiting structure does not affect the rotation of the moving contact 13. Of course, a compression spring can also be omitted, and other elastic components can be used instead.

[0077] like Figure 21-22 As shown, the two ends of the contact shaft 14 are respectively inserted into two fixed bushings 140 and can rotate flexibly. The unit housing 19 has fixing grooves on both sides that are interference-fitted with the bushings 140. The bushings 140 are fixed by being inserted into the fixing grooves of the unit housing 19. This directly engages the metal contact shaft 14 with the fixing grooves on the plastic unit housing 19, instead of allowing the contact shaft 14 to rotate within the copper bushings 140. This reduces wear on the fixing grooves and minimizes the impact on the concentricity of the moving contact assembly 10.

[0078] like Figure 21-22 As shown, each of the two outer sides of the contact support 16 is provided with an arc-blocking plate 17, which can prevent arc particles from being ejected between the unit housing 19 and the contact support 16.

[0079] like Figure 21-22 As shown, the moving contact assembly 10 in this embodiment also includes an insulating tail wing 15. One end of the insulating tail wing 15 is wrapped around the connection between the contact portion 13a and the moving contact mounting portion 13b of the moving contact 13, and the insulating tail wing 15 and the moving contact 13 are fixed together by a rivet 150. The arc-blocking portion 15a at the other end of the insulating tail wing 15 is spaced apart from the contact support 16. The insulating tail wing 15 blocks a large number of arc particles from being sprayed back into the contact support 16.

[0080] It should be noted that in the description of this invention, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship conventionally placed during use. They are used only for ease of description and do not indicate that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating relative importance.

[0081] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A circuit breaker, comprising an operating mechanism and at least one contact unit, the contact unit comprising a moving contact assembly (10) and a stationary contact (18), the moving contact assembly (10) comprising a contact support (16) and a moving contact (13) disposed on the contact support (16), a contact spring (130) being provided between the moving contact (13) and the contact support (16), characterized in that: The operating mechanism includes a linkage rod (30), a bracket (40), a rocker arm assembly (50), a jump catch (70), a locking catch (60), and a re-catching catch (80) pivotally mounted on the bracket (40), a main spring (31) disposed between the rocker arm assembly (50) and the linkage rod (30), and a first crank (71) pivotally mounted on the jump catch (70) and limitedly engaged with the jump catch (70) and the linkage rod (30). The linkage rod (30) is linked to the contact support (16) through a transmission assembly. The circuit breaker also includes a quick-acting structure, which includes a first push rod. (21) The second push rod (24) and the third push rod (25) are pivotally mounted and driven to cooperate with the moving contact (13) and the second push rod (24) respectively. The second push rod (24) is pivotally mounted and fixedly connected to the third push rod (25) so that the second push rod (24) and the third push rod (25) rotate synchronously. The third push rod (25) is provided with a third push rod driving part (25a) for driving the operating mechanism to release. The re-lock (80) is provided with a re-locking receiving arm (80b) driven to cooperate with the third push rod driving part (25a). When opening / closing the circuit breaker, the rocker arm assembly (50) is rotated, which drives the linkage rod (30) via the main spring (31). The linkage rod (30) drives the moving contact (13) to rotate, causing the moving contact (13) to open and close with the stationary contact (18). At the same time, the linkage rod (30) drives the trip latch (70) via the first crank (71). The trip latch (70) and the latch (60) remain in the locked state, and the latch (60) also remains in the locked state with the re-latch (80). When the moving contact (13) is electrically repelled by the short-circuit current, the moving contact (13) rotates. The action is applied to the first push rod (21), causing the first push rod (21) to rotate and act on the second push rod (24). The third push rod (25) rotates with the second push rod (24) and acts on the re-locking arm (80b) through the third push rod drive part (25a), driving the re-lock (80) to rotate until it unlocks from the lock (60). The lock (60) rotates until it unlocks from the jump lock (70), driving the jump lock (70) to rotate, causing the linkage rod (30) to rotate in conjunction with the moving contact (13), causing the moving contact (13) to disconnect from the stationary contact (18).

2. The circuit breaker according to claim 1, characterized in that: The re-clamp (80) includes a re-clamp mounting part (80e), which is pivotally mounted on the bracket (40) via a re-clamp pivot (81). One side of the re-clamp mounting part (80e) is provided with a re-clamping feature (80a) that locks into the latch (60), and the other side is provided with the re-clamping driven arm (80b). The end slope (80d) of the re-clamping driven arm (80b) is used to drive into the third push rod drive part (25a). The middle part of the re-clamping driven arm (80b) is provided with a re-clamping limiting feature (80c) for limiting the rotation angle of the re-clamp (80). The bracket (40) is provided with a bracket stop boss (41a) that abuts against the re-clamping limiting feature (80c).

3. The circuit breaker according to claim 1, characterized in that: The third push rod (25) includes a coupling part (25d), a third push rod connecting part (25b), and a third push rod driving part (25a) connected in sequence. The coupling part (25d) is provided with a coupling hole (25e) that engages with the coupling boss (24a) at the end of the second push rod (24).

4. The circuit breaker according to claim 3, characterized in that: The moving contact assembly (10) and the stationary contact (18) are disposed inside the unit housing (19). The moving contact (13) and the first push rod (21) are pivotally disposed on the contact support (16). The second push rod (24) is rotatably disposed inside the unit housing (19) and is provided with a coupling boss (24a) extending outside the unit housing (19) and fixedly connected to the third push rod (25).

5. The circuit breaker according to claim 4, characterized in that: The second push rod (24) is a circular shaft structure. The circular shaft structure of the second push rod (24) is rotatably engaged with the two side walls of the unit housing (19). Both ends of the second push rod (24) are provided with coupling bosses (24a) that are fixedly connected to the third push rod (25). The middle part of the circular shaft structure is provided with a second push rod driven part (24b) that protrudes to one side. The second push rod driven part (24b) is driven to engage with the first push rod (21).

6. The circuit breaker according to claim 1, characterized in that: One end of the first push rod (21) is pivotally mounted, and the other end of the first push rod (21) is a first push rod mating end. The first push rod mating end has a first push rod receiving surface (21a) on one side and a first push rod driving surface (21b) on the other side. The moving contact (13) is provided with a moving contact driving part (13e) that drives and engages with the first push rod receiving surface (21a). The second push rod (24) is provided with a second push rod receiving part (24b) that drives and engages with the first push rod driving surface (21b). The moving contact (13) and the first push rod (21) are pivotally mounted on the contact support (16) of the moving contact assembly (10). When the circuit is closed, the first push rod (21) rotates with the contact support (16) until the first push rod mating end is located between the moving contact driving part (13e) and the second push rod driven part (24b). The first push rod driven surface (21a) is opposite to and spaced apart from the moving contact driving part (13e), and the first push rod driving surface (21b) is opposite to and spaced apart from the second push rod driven part (24b).

7. The circuit breaker according to claim 1, characterized in that: The latch (60) includes a locking plate (60c). The top of the locking plate (60c) is provided with a protruding latch feature (60a) for locking with the re-latch (80). The bottom of the locking plate (60c) is provided with a recessed latch feature (60b) for locking with the jump latch (70). The bottom sides of the locking plate (60c) are also provided with latch mounting feet (60e). The latch mounting feet (60e) are pivotally mounted on the bracket (40) via a latch pivot (61).

8. The circuit breaker according to claim 1, characterized in that: The first crank (71) has three corners. The first corner of the first crank (71) is pivotally mounted on the jumper (70) via the first crank shaft (710). The second corner of the first crank (71) is provided with a first crank limiting part (711) that cooperates with the jumper (70). The third corner of the first crank (71) is provided with a limiting notch (71a) that cooperates with the linkage rod (30).

9. The circuit breaker according to claim 1, characterized in that: One end of the jump buckle (70) is pivotally mounted on the bracket (40) via the jump buckle pivot (72), and the other end of the jump buckle (70) is provided with a protruding jump buckle lock feature (70a) for locking with the lock buckle (60). The middle part of the jump buckle (70) is provided with a jump buckle limiting part between the jump buckle pivot (72) and the first crank pivot (710) for limiting with the first crank (71).

10. The circuit breaker according to claim 1, characterized in that: The moving contact (13) is pivotally mounted on the contact support (16) of the moving contact assembly (10) via the contact pivot (14). The linkage rod (30) is linked with the contact support (16) via the transmission assembly, driving the contact support (16) and the moving contact (13) to rotate around the contact pivot (14). The transmission assembly (90) includes a first connecting rod (91), a second connecting rod (92), and a second crank (93). The second crank (93) has three corners. One end of the first connecting rod (91) is hinged to the linkage rod (30). The two ends of the second connecting rod (92) are respectively hinged to the other end of the first connecting rod (91) and the first corner of the second crank (93). The second corner of the second crank (93) is pivotally mounted on the contact shaft (14), and the third corner of the second crank (93) is hinged to the transmission shaft (160).

11. The circuit breaker according to claim 1, characterized in that: The moving contact assembly (10) further includes a connecting plate (11) and a conductive pad (12). One end of the moving contact (13) is a contact portion (13a) for cooperating with the stationary contact (18), and the other end of the moving contact (13) is a moving contact mounting portion (13b) that extends into the receiving groove (16c) of the contact support (16). The connecting plate (11) has two connecting plate mounting portions (11a) that extend into the receiving groove (16c) of the contact support (16). The moving contact mounting portion (13b) is rotatably disposed between the two connecting plate mounting portions (11a). Each side of the moving contact mounting portion (13b) is connected to the two connecting plate mounting portions (11a) through a conductive pad (12). The conductive pad (12) is slidably engaged with the moving contact (13).

12. The circuit breaker according to claim 11, characterized in that: The conductive pad (12) One side of the conductive pad (12) is in contact with the connecting plate (11), and the other side of the conductive pad (12) is a convex curved surface (12a). The moving contact (13) is provided with a curved groove (13c) that slides with the convex curved surface (12a).

Images