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, and the operating mechanism comprises a linkage rod, a support, a rocker arm assembly, a jump pin, a lock catch, a re-buckle and a main spring arranged between the rocker arm assembly and the linkage rod, the first crank is pivotally arranged on the jump pin and is in limiting fit with the jump pin and the linkage rod; the linkage rod is in linkage with the contact support through a transmission assembly; the circuit breaker further comprises a quick-acting structure, the quick-acting structure comprises a first push rod, a second push rod and a third push rod, the first push rod is arranged in a pivoted mode and is in driving fit with the moving contact and the second push rod, the second push rod is arranged in a pivoted mode and is fixedly connected with the third push rod, and the second push rod is provided with a re-buckling driven arm in driving fit with a driving part of the third push rod in a buckled mode. According to the circuit breaker provided by the invention, the transmission stage number of the quick-acting structure is reduced, and after the re-tripping of the operating mechanism is driven by the quick-acting structure, the moving contact is quickly transmitted and driven through each part, so that the quick tripping action is realized.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical appliances, and particularly to a circuit breaker. Background Art

[0002] Most of the existing molded case circuit breakers adopt the cooperation of various parts of the instantaneous unit of the release during short circuit, and transmit the tripping and opening actions to the reclosing one by one to achieve short-circuit tripping protection. However, this will lead to too 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 the present invention is to overcome at least one defect of the prior art and provide a circuit breaker.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A circuit breaker includes an operating mechanism and at least one contact unit. The contact unit includes a moving contact assembly and a static contact. The moving contact assembly includes a contact support and a moving contact arranged on the contact support. A contact spring is arranged between the moving contact and the contact support. The operating mechanism includes a linkage rod, a bracket, a rocker arm assembly, a trip, a latch, and a reclosing that are respectively pivotally arranged on the bracket. A main spring is arranged between the rocker arm assembly and the linkage rod. A first crank is pivotally arranged on the trip and is in limit cooperation with the trip and the linkage rod. The linkage rod is linked with the contact support through a transmission component. The circuit breaker further includes a quick-acting structure. The quick-acting structure includes 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 so that the second push rod and the third push rod rotate synchronously. The third push rod is provided with a third push rod driving part for driving the operating mechanism to trip. The reclosing is provided with a reclosing driven arm that is in driving cooperation with the third push rod driving part.

[0006] During closing / opening, the rocker arm assembly is rotated, the linkage rod is driven by the main spring, the linkage rod drives the moving contact to rotate, so that the moving contact and the static contact are opened and closed. The linkage rod also drives the trip through the first crank at the same time. The trip and the latch remain in the locked state, and the latch also remains in the locked state with the reclosing. When the moving contact is electrically repelled by the short-circuit current, the moving contact rotates and acts on the first push rod, causing 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 reclosing driven arm through the third push rod driving part, driving the reclosing to rotate to unlock with the latch, and the latch rotates to unlock with the trip, driving the trip to rotate, driving the linkage rod to drive the moving contact to rotate, and disconnecting the moving contact and the static contact.

[0007] Preferably, the re-latch includes a re-latch mounting portion pivotally provided on the bracket through a re-latch rotating shaft. One side of the re-latch mounting portion is provided with a re-latch feature for locking and cooperating with the latch, and the other side is provided with the re-latch actuating arm. The end inclined surface of the re-latch actuating arm is used for driving and cooperating with the third push rod driving portion. The middle of the re-latch actuating arm is provided with a re-latch limiting feature for limiting the rotation angle of the re-latch, and the bracket is provided with a bracket stop boss for resisting and cooperating with the re-latch limiting feature.

[0008] Preferably, the third push rod includes a coupling portion, a third push rod connecting portion, and a third push rod driving portion connected in sequence. The coupling portion is provided with a coupling hole for snap-fitting with the coupling boss at the end of the second push rod.

[0009] Preferably, the moving contact assembly and the static contact are arranged in the unit housing. The moving contact and the first push rod are pivotally arranged on the contact support. The second push rod is rotatably arranged in 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 of a round shaft structure. The round shaft structure of the second push rod is rotatably matched with the two side walls of the unit housing. Both ends of the second push rod are provided with coupling bosses fixedly connected to the third push rod. A second push rod actuating portion protruding to one side is provided on the radial direction of the middle of the round shaft structure. The second push rod actuating portion is drivingly cooperated with the first push rod.

[0011] Preferably, one end of the first push rod is pivotally arranged, 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 actuating 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 portion for driving and cooperating with the first push rod actuating surface; the second push rod is provided with a second push rod actuating portion for driving and cooperating with the first push rod driving surface; the moving contact and the first push rod are pivotally arranged on the contact support of the moving contact assembly; during closing, the first push rod rotates with the contact support until the first push rod mating end is located between the moving contact driving portion and the second push rod actuating portion. The first push rod actuating surface is opposite to and spaced from the moving contact driving portion, and at the same time, the first push rod driving surface is opposite to and spaced from the second push rod actuating portion.

[0012] Preferably, the latch includes a locking plate. The top end of the locking plate is provided with a protruding latch locking feature for locking and cooperating with the re-latch. The bottom end of the locking plate is provided with a recessed latch latching feature for locking and cooperating with the jump latch. The two sides of the bottom end of the locking plate are also provided with latch mounting feet. The latch mounting feet are pivotally arranged on the bracket through a latch rotating shaft.

[0013] Preferably, the first crank has three angles. The first angle of the first crank is pivotally arranged on the jump latch through the first crank rotating shaft. The second angle of the first crank is provided with a first crank limiting part for limiting cooperation with the jump latch. The third angle of the first crank is provided with a limiting notch for limiting cooperation with the linkage rod.

[0014] Preferably, one end of the jump latch is pivotally arranged on the bracket through the jump latch rotating shaft. The other end of the jump latch is provided with a protruding jump latch locking feature for locking cooperation with the lock catch. A jump latch limiting part is arranged between the middle part of the jump latch and the first crank rotating shaft for limiting cooperation with the first crank.

[0015] Preferably, the moving contact is pivotally arranged on the contact support of the moving contact assembly through the contact rotating shaft. The linkage rod is linked with the contact support through the transmission assembly to drive the contact support and the moving contact to rotate around the contact rotating shaft;

[0016] The transmission assembly includes a first connecting rod, a second connecting rod, and a second crank. The second crank has three angles. One end of the first connecting rod is hinged to the linkage rod. Two ends of the second connecting rod are respectively hinged to the other end of the first connecting rod and the first angle of the second crank. The second angle of the second crank is pivotally arranged on the contact rotating shaft. The third angle of the second crank is hinged to the transmission shaft.

[0017] Preferably, the moving contact assembly further includes a connecting plate and a conductive gasket. One end of the moving contact is a contact part for cooperating with the static contact. The other end of the moving contact is a moving contact installation part extending into the accommodation groove of the contact support. The connecting plate has two connecting plate installation parts extending into the accommodation groove of the contact support. The moving contact installation part is rotatably arranged between the two connecting plate installation parts. Both sides of the moving contact installation part are connected to the two connecting plate installation parts through a conductive gasket respectively. The conductive gasket is in sliding cooperation with the moving contact.

[0018] Preferably, one side surface of the conductive gasket is in contact connection with the connecting plate. The other side surface of the conductive gasket is a convex curved surface. The moving contact is provided with a curved surface groove in sliding cooperation with the convex curved surface.

[0019] In the circuit breaker of the present invention, when the circuit breaker is short-circuited, the moving contact bounces due to the electric repulsive force, triggering the quick-acting structure to trip the operating mechanism, so as to achieve the purpose of tripping the operating mechanism prior to the instantaneous tripping unit. The quick-acting structure of this embodiment is simple, only provided with a first push rod and fixedly connected second push rod and third push rod. The second push rod and the third push rod rotate synchronously, reducing the transmission elements, thus reducing the transmission stages, making the transmission faster, more stable and reliable, and realizing the quick tripping of the operating mechanism during short circuit; moreover, after the re-latching of the operating mechanism is driven by the quick-acting structure, it is quickly transmitted through the cooperation between the lock catch, the jump latch, the first crank and the linkage rod to drive the moving contact, realizing the quick 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 value of the moving contact assembly, the contact area is reduced, the rotational friction force between the connecting plate and the moving contact is decreased, the rotation of the moving contact is smoother, and the operating force of the product is smaller.

[0021] In addition, the sliding structure between the conductive gasket and the moving contact adopts a convex curved surface and a curved surface groove in sliding fit. The structure is simple, and the arc-shaped contact effectively reduces the rotational friction force, making the rotation more flexible. Additionally, the smaller the friction force, the less the wear, improving the service life.

[0022] In addition, a clamping coupling structure is adopted between the second push rod and the third push rod to achieve a fixed connection, facilitating the assembly and cooperation with the unit housing.

[0023] In addition, due to the structural design of the third push rod, the third push rod can not only be coupled with the second push rod to rotate synchronously, but also extend to directly cooperate with the reclosing catch, reducing the intermediate transmission and improving the tripping 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 mating end of the first push rod is simultaneously driven by the moving contact and drives the operating mechanism. Compared with the seesaw-type rotating structure with the middle pivoting and both ends swinging, the structure is simple, the action is simpler and more reliable, and the structure is compact and non-interfering. Description of the Drawings

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

[0026] Figure 2 is an exploded view of the quick-acting structure of the present invention;

[0027] Figure 3 is a three-dimensional view of the operating mechanism and the contact unit in the closing state of the present invention;

[0028] Figure 4 is a three-dimensional view of the operating mechanism and the contact unit with the bracket hidden in the closing state of the present invention;

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

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

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

[0032] Figure 8is a sectional view of the operating mechanism and the contact unit in the state that the present invention is about to trip;

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

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

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

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

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

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

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

[0040] Figure 16 is the present invention Figure 15 an enlarged view of part A in;

[0041] Figure 17 is a schematic structural diagram of the operating mechanism with the bracket hidden in the present invention;

[0042] Figure 18 is a schematic structural diagram of the re-latching of the present invention;

[0043] Figure 19 is a schematic structural diagram of the latch of the present invention;

[0044] Figure 20 is an assembly drawing of the trip latch and the first crank of the present invention;

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

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

[0047] Moving contact assembly 10; connection plate 11; connection plate mounting portion 11a; connection plate wiring portion 11b; compression spring 110; conductive gasket 12; convex curved surface 12a; moving contact 13; contact portion 13a; moving contact mounting portion 13b; curved surface groove 13c; contact spring 130; torsion spring limiting groove 13d; moving contact driving portion 13e; contact rotating shaft 14; bushing 140; insulating tail fin 15; arc separating portion 15a; rivet 150; contact support 16; transmission shaft 160; contact support connection portion 16a; contact support mounting portion 16b; receiving groove 16c; contact support limiting portion 16h; first rotation limiting portion 16i; contact support abutting surface 16j; arc separating plate 17; static contact 18; unit housing 19; first rotation limiting portion 19d; first push rod 21; first push rod receiving surface 21a; first push rod driving surface 21b; first push rod protrusion 21c; first push rod mounting portion 21d; first push rod spring hole 21e; first push rod rotating shaft 22; first push rod spring 23; second push rod 24; coupling boss 24a; second push rod receiving portion 24b; second push rod limiting portion 24c; third push rod 25; third push rod driving portion 25a; third push rod connection portion 25b; third push rod spring hole 25c; coupling portion 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 rotating shaft 521; latch 60; latch rotating shaft 61; latch spring 62; latch locking feature 60a; latch buckling feature 60b; locking plate 60c; latch abutting surface 60d; latch mounting foot 60e; jump latch 70; first crank 71; limiting notch 71a; first crank rotating shaft 710; first crank limiting portion 711; jump latch rotating shaft 72; jump latch locking feature 70a; re-latch 80; re-latch rotating shaft 81; re-latch spring 82; re-latch buckling feature 80a; re-latch receiving arm 80b; re-latch limiting feature 80c; end bevel 80d; re-latch mounting portion 80e; re-latch connecting rod 80f; re-latch abutting platform 80g; transmission assembly 90; first connecting rod 91; second connecting rod 92; second crank 93. Detailed implementation mode

[0048] The following embodiments given in conjunction with the drawings further illustrate the detailed implementation mode of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the description of the following embodiments.

[0049] Such as Figure 1-12As shown, the circuit breaker of this embodiment is a molded case circuit breaker, which includes a circuit breaker housing, an operating mechanism, and at least one contact unit. Each contact unit includes a unit housing 19, a moving contact assembly 10 and a static contact 18 disposed within the unit housing 19. An arc extinguishing chamber may also be provided within the unit housing 19 for extinguishing the arc generated during the opening and closing of the moving contact 13 and the static 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 rotating 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 rotating shaft 14, driving the moving contact 13 to disconnect or close with the static contact 18.

[0050] The circuit breaker of this embodiment is also provided with an instantaneous tripping unit, a time-delay tripping unit, etc. The instantaneous tripping unit is usually an electromagnetic release. When a short circuit fault occurs, the instantaneous tripping unit triggers the operating mechanism to trip; the time-delay tripping unit is usually a bimetallic strip. When an overload fault occurs, the time-delay tripping unit triggers the operating mechanism to trip. The instantaneous tripping unit and the time-delay tripping unit usually act on a traction rod rotatably disposed within the circuit breaker housing. The traction rod acts on the reclosure of the operating mechanism. After the operating mechanism trips, it drives the moving contact 13 to disconnect from the static contact 18 to achieve circuit protection.

[0051] The contact unit of this embodiment serves as a phase pole of the molded case circuit breaker. It can be provided in several numbers. The transmission shaft 160 passes through the contact supports 16 and the unit housings 19 of multiple contact units, enabling multiple contact units to share the same transmission shaft 160. Thus, a single operating mechanism can simultaneously drive the contact supports 16 of several contact units. Preferably, three contact units are provided. The three contact units are arranged side by side and can be correspondingly connected to three-phase electricity. The moving contact 13 is electrically connected to a connection plate 11, and the static contact 18 can be disposed on a wiring board. The contact unit is wired through the connection plate 11 and the wiring board. Of course, as other embodiments, the contact unit within the molded case circuit breaker can be one, two, or more; the contact unit may not be provided with a unit housing 19, and it is also possible to separate each contact unit by providing a partition within the circuit breaker housing; moreover, the contact support 16 and the moving contact 13 may not be disposed on the same contact rotating shaft 14, etc. As Figure 13 As shown, for the moving contact assembly 10 of this embodiment, the contact support 16 includes a contact support connection portion 16a and two symmetrically arranged contact support mounting portions 16b. The contact support connection portion 16a is connected between the two contact support mounting portions 16b to form a receiving groove 16c. At the end of the receiving groove 16c of the contact support 16 away from the static contact 18, there are two spaced-apart contact support limiting portions 16h. A contact support abutting surface 16j is provided on one of the contact support limiting portions 16h. The contact support mounting portion 16b is in a structure similar to an arcuate plate, and its top surface is a curved surface.

[0052] As shown Figure 14 in the figure, one end of the moving contact 13 is matched with the static contact 18, and a torsion spring limiting groove 13d is provided thereon. The other end of the moving contact 13 is of a structure similar to a circular plate and is pivotally arranged 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. The contact spring 130 in this embodiment is a torsion spring. The contact spring 130 has two spring bodies. The two spring bodies are respectively sleeved on the contact rotating shaft 14. The straight sections at one ends of the two spring bodies respectively abut against both sides of the contact support connecting portion 16a. The other ends of the two spring bodies are connected by a U-shaped section. The U-shaped section is snapped into the torsion spring limiting groove 13d. During normal opening / closing, the moving contact 13 rotates synchronously with the contact support 16 and rotates relative to the contact support 16 when the moving contact 13 contacts the static contact 18, and the overtravel is realized through the contact spring 130. When a short-circuit large current flows through the moving contact 13 and the static contact 18, the electro-dynamic repulsive force between the moving contact 13 and the static 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 rotating shaft 14, and the moving contact 13 is electro-dynamically repelled.

[0053] As shown Figure 1-12 in the figure, the quick-acting structure of this embodiment includes an operating mechanism, a moving contact assembly 10 and a static contact 18, and 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 arranged and can rotate around the first push rod rotating shaft 22. The first push rod 21 is drivingly matched with the moving contact 13 and the second push rod 24 respectively. The second push rod 24 is pivotally arranged 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 portion 25a for driving the operating mechanism to trip. When the moving contact 13 is electro-dynamically repelled by the short-circuit current, the moving contact 13 rotates, acts on the first push rod 21, causes the first push rod 21 to rotate and act on the second push rod 24, and the third push rod 25 rotates with the second push rod 24 and drives the operating mechanism to trip through the third push rod driving portion 25a, as shown Figure 9-10 in the figure. An improvement point of this application is that when the circuit breaker is short-circuited, the electro-dynamic repulsive force is large. The moving contact 13 is bounced off due to the electro-dynamic repulsive force, triggering the quick-acting structure to cause the operating mechanism to trip, so as to achieve the purpose of tripping the operating mechanism prior to the instantaneous tripping unit. The quick-acting structure of this embodiment is simple, only provided with the first push rod 21 and the second push rod 24 and the third push rod 25 fixedly connected. The second push rod 24 and the third push rod 25 rotate synchronously, reducing the transmission elements, thereby reducing the transmission stages, making the transmission faster, more stable and reliable, and realizing the quick tripping of the operating mechanism.

[0054] As shownFigure 6 As shown, one end of the first push rod 21 is pivotally arranged, and the other end of the first push rod 21 is the first push rod mating end. The first push rod mating end is in driving cooperation with the moving contact 13 and is also in driving cooperation with the second push rod 24. The first push rod 21 in this embodiment 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 seesaw-type rotating structure with the middle pivoting and both ends swinging, the structure is simple, the movement is simpler and more reliable, the structure is compact, and there is no interference with each other. 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 is provided with a moving contact driving portion 13e at the end away from the static contact 18 for driving cooperation with the first push rod receiving surface 21a; the second push rod 24 is provided with a second push rod receiving portion 24b for driving cooperation with the first push rod driving surface 21b. The receiving and driving parts of the first push rod 21 are two side surfaces at the same end, which simplifies the structure of the first push rod 21.

[0055] Regarding the pivotal arrangement structure of the first push rod 21 in this embodiment, the first push rod 21 can be arranged on the unit housing 19, that is, it is always arranged opposite to the second push rod 24. The first push rod 21 can also be arranged on the contact support 16 and rotate with the moving contact 13 along with the contact support 16.

[0056] As Figure 14 shown, the first push rod 21 in this embodiment is pivotally arranged in the receiving groove 16c on the contact support 16 through the first push rod rotating shaft 22. Specifically, the first push rod rotating shaft 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 for cooperating with the first push rod rotating shaft 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 portion 13e and the second push rod receiving portion 24b. In the normal closing state, there is no contact between the first push rod mating end and the moving contact driving portion 13e and the second push rod receiving portion 24b. The first push rod receiving surface 21a is opposite to and spaced from the moving contact driving portion 13e, and at the same time, the first push rod driving surface 21b is opposite to and spaced from the second push rod receiving portion 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 flat surfaces, and the moving contact driving portion 13e and the second push rod receiving portion 24b are convex structures. The cooperation between the first push rod 21 and the moving contact 13 and the second push rod receiving portion 24b is simple and easy to manufacture.

[0057] As Figure 14As shown, the mating structure between the first push rod 21 and the contact support 16 in this embodiment. 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 rotating shaft 22, and 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 on the first push rod spring hole 21e, and the other end abuts against the contact support abutting surface 16j. Before installing the first push rod 21 in the contact support 16, first hang one end 23a of the first push rod spring 23 in the first push rod spring hole 21e. The first push rod spring 23 and the shaft hole on the first push rod mounting portion 21d for rotational mating with the first push rod rotating 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 rotating shaft 22 and are arranged side by side between the two contact support limiting portions 16h. The first push rod 21 has a first push rod mounting portion 21d for pivotal setting. The first push rod mounting portion 21d is a round block structure. Its first end extends radially along a direction perpendicular to the axial direction of the first push rod rotating shaft 22 to form the first push rod mating end. A first push rod spring hole 21e is provided on the first push rod mating end. A first push rod protrusion 21c for limiting the rotation angle of the first push rod 21 is provided on the side wall of the first push rod mounting portion 21d. The second end of the first push rod mounting portion 21d abuts against the corresponding contact support limiting portion 16h. A rotation limiting portion 16i for resisting and mating with the first push rod protrusion 21c is provided on the contact support limiting portion 16h.

[0058] As Figure 2 shown, the second push rod 24 is rotatably arranged in 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, so that the second push rod 24 and the third push rod 25 rotate synchronously. The unit housing 19 is provided with a rotation hole for rotational mating with the second push rod 24. The third push rod 25 is arranged outside the unit housing 19 and is drivingly mated with the reclosing 80 of the operating mechanism. The reclosing 80 is provided with a reclosing driven arm 80b for drivingly mating with the third push rod 25. When the molded case circuit breaker has multiple contact units, each contact unit has a second push rod 24, and there is a third push rod 25 between every two adjacent contact units. One third push rod 25 can be coupled with the second push rods 24 in the two contact units on its both sides simultaneously.

[0059] As Figure 2 shown, the second push rod 24 is a round shaft structure. The round shaft structure of the second push rod 24 is rotationally mated with the two side walls of the unit housing 19, and coupling bosses 24a fixedly connected to the third push rod 25 are provided at both ends of the second push rod 24. A second push rod receiving portion 24b protruding to one side is provided on the middle part of the round shaft structure in the radial direction. The second push rod receiving portion 24b is drivingly mated with the first push rod 21. AsFigure 15 - Figure 16 As shown, the second push rod 24 is provided with a second push rod limiting portion 24c for limiting the rotation angle of the second push rod 24, and the unit housing 19 is provided with a first rotation limiting portion 19d that abuts and cooperates with the second push rod limiting portion 24c.

[0060] As Figure 2 shown, the third push rod 25 includes a coupling portion 25d, a third push rod connecting portion 25b, and a third push rod driving portion 25a that are connected in sequence. The coupling portion 25d is a round block structure that can be docked at the end of the second push rod 24, and is provided with a coupling hole 25e that is snap-fitted with the coupling boss 24a at the end of the second push rod 24. The coupling boss 24a of the second push rod 24 is snapped into the coupling hole 25e of the third push rod 25, so that when the second push rod 24 rotates, the third push rod 25 rotates synchronously. The third push rod connecting portion 25b is a sheet-like structure perpendicular to the axial direction of the coupling portion 25d, and is provided with 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 arranged, for example, hung on a connecting shaft for connecting a plurality of contact units. The third push rod driving portion 25a is a bent structure similar to an L shape perpendicular to the third push rod connecting portion 25b, and the third push rod driving portion 25a is drivingly cooperated with the reclosing actuating arm 80b. The reclosing actuating arm 80b is located on the concave side of the bent structure. The structural design of the third push rod 25 in this embodiment enables the third push rod 25 to not only be coupled and rotate synchronously with the second push rod 24, but also extend to directly cooperate with the reclosing 80, reducing intermediate transmission and improving the tripping speed of the operating mechanism. In this embodiment, a snap-coupling structure is adopted between the second push rod 24 and the third push rod 25 to achieve fixed connection, which is convenient for assembly and cooperation with the unit housing 19. Of course, as other embodiments, fixed connection methods such as integral setting can also be adopted.

[0061] As Figure 1 and Figure 17As shown in the figure, the operating mechanism of this embodiment includes a linkage rod 30, a bracket 40, a rocker arm assembly 50, a toggle 70, a latch 60, and a reclosing latch 80 that are respectively pivotally arranged on the bracket 40. A main spring 31 is arranged between the rocker arm assembly 50 and the linkage rod 30. A first crank 71 is pivotally arranged on the toggle 70 and is in limit cooperation with the toggle 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 to drive the linkage rod 30 through the main spring 31. The linkage rod 30 drives the moving contact 13 to rotate through the transmission assembly 90, so that the moving contact 13 is opened and closed with the static contact 18. At the same time, the linkage rod 30 drives the toggle 70 through the first crank 71. The toggle 70 and the latch 60 are kept in a locked state, and the latch 60 is also kept in a locked state with the reclosing latch 80. During tripping, the moving contact 13 is electrically repelled by a large current, so that the first push rod 21 pushes the second push rod 24. The third push rod 25 rotates with the second push rod 24 and acts on the reclosing actuating arm 80b of the reclosing latch through the third push rod driving part 25a, driving the reclosing latch 80 to rotate around the reclosing latch rotating shaft 81 to unlock with the latch 60. The latch 60 rotates around the latch rotating shaft 61 to unlock with the toggle 70, driving the toggle 70 to rotate around the toggle rotating shaft 72, driving the linkage rod 30 to drive the moving contact 13 to rotate, so that the moving contact 13 is disconnected from the static contact 18. When reclosing again, the rocker arm assembly 50 is rotated to drive the toggle 70 to reset. The latch 60 rotates and resets under the action of the latch spring 62 to be locked with the toggle 70. The reclosing latch 80 rotates and resets under the action of the reclosing latch spring 82 to be locked with the latch 60. Another improvement point of this application is that after the reclosing latch 80 of the operating mechanism is driven by the quick-acting structure, through the cooperation between the latch 60, the toggle 70, the first crank 71, and the linkage rod 30, the moving contact 13 is driven to quickly execute the tripping action.

[0062] The locking structure among the toggle 70, the latch 60, and the reclosing latch 80 of this embodiment is as Figure 6 shown. The toggle 70 is provided with a toggle lock feature 70a, and the latch 60 is provided with a latch lock feature 60b that is in locking cooperation with the toggle lock feature 70a, as Figure 2 shown. The latch 60 is further provided with a latch lock feature 60a, and the reclosing latch 80 is provided with a reclosing latch lock feature 80a that is in locking cooperation with the latch lock feature 60a. As Figure 6 or Figure 12 shown. During normal opening / closing, the toggle lock feature 70a remains latched on the latch lock feature 60b to keep the toggle 70 and the latch 60 in a locked state. The reclosing latch lock feature 80a remains latched on the latch lock feature 60a to keep the latch 60 and the reclosing latch 80 in a locked state. There is pressure between the contact surfaces of the reclosing latch lock feature 80a and the latch lock feature 60a. At the same time, the reclosing actuating arm 80b of the reclosing latch is in contact with the third push rod driving part 25a, but the pressure between the contact surfaces is very small or close but not in contact; as Figure 10As shown, during a fault trip, the third push rod driving part 25a pushes the re-latching driven arm 80b, and the re-latching 80 rotates, causing the re-latching feature 80a to disengage from the latch locking feature 60a, thereby unlocking the re-latching 80 from the latch 60. The latch 60 rotates, causing the latch locking feature 60b to disengage from the trip locking feature 70a, thereby unlocking the latch 60 from the trip 70.

[0063] As Figure 1 and Figure 17 As shown, the bracket 40 of this embodiment includes two bracket side plates 41 and at least two fixed shafts 42. The trip rotating shaft 72, the latch rotating shaft 61, and the re-latching rotating 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 by passing through the fixed shaft 42. Both ends of the fixed shaft 42 also penetrate into the two contact units on both sides to achieve the fixed installation between the bracket 40 and the three contact units.

[0064] As Figure 1 and Figure 17 As shown, the rocker arm assembly 50 of this embodiment includes a handle 51 and a rocker arm 52 that are fixedly connected. The rocker arm 52 is 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 through a fixed rod. Each of the two arms of the rocker arm 52 is pivotally arranged on the two bracket side plates 41 of the bracket 40 through a rocker arm rotating shaft 521. By rotating the handle 51, the rocker arm 52 rotates around the rocker arm rotating shaft 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, and both ends of the main spring 31 are respectively connected to the fixed rod and the linkage rod 30.

[0065] As Figure 17-18 As shown, the re-latching 80 of this embodiment is an integrally formed structure, including a re-latching mounting portion 80e. The re-latching mounting portion 80e is pivotally arranged on the bracket 40 through a re-latching rotating shaft 81. One side of the re-latching mounting portion 80e is provided with a re-latching feature 80a that locks and cooperates with the latch 60, and the other side is provided with the re-latching driven arm 80b. The end inclined surface 80d of the re-latching driven arm 80b is used for driving and cooperating with the third push rod driving part 25a. A re-latching limit feature 80c for limiting the rotation angle of the re-latching 80 is provided in the middle of the re-latching driven arm 80b, and a bracket stop boss 41a that resists and cooperates with the re-latching limit feature 80c is provided on the bracket 40. Optionally, as Figure 1 、 Figure 18As shown, the quick-acting structure has two third push rods 25. Correspondingly, the re-latch 80 has two re-latch driven arms 80b, which are connected by a re-latch connecting rod 80f. One of the re-latch driven arms 80b is provided with the re-latch limiting feature 80c, and the other re-latch driven arm 80b is provided with a re-latch abutting platform 80g. One end of the re-latch spring 82 is connected to the re-latch abutting platform 80g, and the other end is connected to the bracket 40.

[0066] As Figure 17 , Figure 19 shown, the latch 60 of this embodiment is an integrally formed structure, including a locking plate 60c. The locking plate 60c has a latch abutting surface 60d facing the jumping latch 70. The top end of the locking plate 60c is provided with a protruding latch locking feature 60a for locking and cooperating with the re-latch locking feature 80a of the re-latch 80. The bottom end of the locking plate 60c is provided with a concave latch locking feature 60b for locking and cooperating with the jumping latch 70. The two sides of the bottom end of the locking plate 60c are also provided with latch mounting feet 60e, and the latch mounting feet 60e are pivotally arranged on the bracket 40 through a latch rotating shaft 61. As Figure 1 , Figure 19 shown, the latch mounting foot 60e is bent and connected to the locking plate 60c. The latch spring 62 is sleeved on the latch rotating shaft 61, with one end abutted against the bent connection between the latch mounting foot 60e and the locking plate 60c, and the other end abutted against the unit housing 19 or the bracket 40.

[0067] As Figure 17 and Figure 20 shown, the first crank 71 of this embodiment is an integrally formed triangular plate structure with three corners. The first corner of the first crank 71 is pivotally arranged on the jumping latch 70 through a first crank rotating shaft 710. The second corner of the first crank 71 is provided with a first crank limiting portion 711 for limiting and cooperating with the jumping latch 70. The third corner of the first crank 71 is provided with a limiting notch 71a for limiting and cooperating with the linkage rod 30.

[0068] As Figure 17 and Figure 20As shown, the jump buckle 70 is a special-shaped plate structure formed integrally. One end of the jump buckle 70 is pivotally arranged on the bracket 40 through a jump buckle rotating shaft 72. The other end of the jump buckle 70 is provided with a protruding jump buckle locking feature 70a for locking and cooperating with the locking buckle feature 60b of the locking buckle 60. When tripping, the jump buckle locking feature 70a disengages from the locking buckle feature 60b and abuts or faces the locking buckle abutting surface 60d. A jump buckle limiting portion is provided between the middle of the jump buckle 70 and the first crank rotating shaft 710 for limiting and cooperating with the first crank limiting portion 711 of the first crank 71. Preferably, two first cranks 71 are provided. The two first cranks 71 are located on both sides of the jump buckle 70 and share the same first crank rotating shaft 710. The first crank limiting portion 711 is a round shaft structure, and the two ends are respectively hinged to the second angle of the first crank 71. The jump buckle limiting portion is a concave opening structure provided on the bottom edge of the jump buckle 70. During normal closing / opening, the first crank limiting portion 711 is placed inside the jump buckle limiting portion, and at this time, the first crank 71 and the jump buckle 70 are linked; when tripping, the first crank limiting portion 711 disengages from the jump buckle limiting portion, and at this time, the first crank 71 and the jump buckle 70 can rotate relative to each other.

[0069] As Figure 1 , Figure 3-4 As shown, the transmission assembly 90 of this embodiment is linked with the contact support 16 through the transmission shaft 160, driving the contact support 16 and the moving contact 13 to rotate around the contact rotating 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 and has three angles. 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 angle of the second crank 93. The second angle of the second crank 93 is pivotally arranged on the contact rotating shaft 14, and the third angle of the second crank 93 is hinged to the transmission shaft 160.

[0070] The operating processes of closing, tripping, and re-latching (opening) of the molded case circuit breaker in this embodiment.

[0071] During the closing process, the rocker arm 52 rotates counterclockwise. The main tension spring 31 pulls the first crank 63 and the first connecting rod 91 to flip. The second crank 93 rotates around the contact rotating shaft 14, driving the contact support 16 through the transmission shaft 160. The contact spring 130 presses the moving contact 13 against the contact support 16. Therefore, the moving contact 13 and the contact support 16 rotate together; when the moving contact 13 touches the static contact 18, the rotation of the moving contact 13 will be hindered and it presses on the static contact 18. The contact support 16 will continue to rotate for a certain stroke and then stop at the limit point. During this stroke, the moving contact 13 and the contact support 16 generate relative displacement. The moving contact driving portion 13e of the moving contact 13 slides a certain distance on the first push rod receiving surface 21a of the first push rod 21, and finally the closing is completed asFigure 3-6 As shown, the first push rod 21 will rotate by a certain angle accordingly, and the moving contact driving part 13e, the first push rod 21, and the second push rod 24 present the positional relationship as shown in Figure 4 and Figure 6 shown.

[0072] When a large breaking current flows through the moving contact 13 and the static contact 18, an electro - dynamic repulsive force and a pneumatic repulsive force will be generated between the moving contact 13 and the static contact 18. When the total repulsive force is greater than the force exerted by the contact spring 130 on the moving contact 13, the moving contact 13 will gradually lift. During the process of the moving contact 13 lifting, the moving contact driving part 13e thereon will exert a force on the force - receiving surface 21a of the first push rod, pushing the first push rod 21 to rotate clockwise. At the same time, the driving surface 21b of the first push rod on the other side of the first push rod 21 exerts a pressure on the force - receiving part 24b of the second push rod, 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 driving part 25a of the third push rod pushes the reclosing force - receiving arm 80b, causing the reclosing 80 to rotate clockwise, Figure 7-8 as shown is the state where the reclosing feature 80a is about to disengage from the locking feature 60a of the lock; when the moving contact 13 continues to lift, the reclosing feature 80a will disengage from the locking feature 60a of the lock. The toggle 70 is pulled by the main tension spring 31, and the locking feature 70a of the toggle slides off the locking feature 60b of the lock. The toggle 70 lifts, and the lock 60 rotates clockwise, driving the second crank 93 to rotate counterclockwise. The contact support 16 rotates accordingly, and then after colliding with the moving contact 13, they rotate counterclockwise together to the limit point of the contact support 16, returning to the tripping state as shown in Figure 9-10 shown.

[0073] When changing from the tripping state to the re - latching (opening) state again, the rocker arm 52 rotates clockwise, pressing down the toggle 70. The lock 60 flips under the action of the lock spring 62, and the toggle 70 rotates clockwise until the locking feature 70a of the toggle latches with the locking feature 60b of the lock. At the same time, the first crank 63 and the first connecting rod 91 flip, and the position of the second crank 93 remains unchanged, so that the moving contact 13 maintains the opening state. While the lock 60 flips, the reclosing 80 rotates counterclockwise under the upward acting force of the reclosing spring 82 until the reclosing limit feature 80c touches the bracket stop boss 41a. Since the moving contact 13 is in the opening state, the positional relationship of the first push rod 21, the second push rod 24, and the third push rod 25 also remains unchanged, as shown in Figure 11-12 shown.

[0074] As Figure 21-22As shown in the figure, the moving contact assembly 10 of this embodiment further includes a connecting plate 11 and a conductive gasket 12. One end of the moving contact 13 is a contact portion 13a for cooperating with the static 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 outside 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 arranged between the two connecting plate mounting portions 11a. Both sides of the moving contact mounting portion 13b are connected to the two connecting plate mounting portions 11a through a conductive gasket 12 respectively. The conductive gasket 12 is in sliding fit with the moving contact 13. Another improvement point of this application is that the connection between the moving contact mounting portion 13b and the connecting plate mounting portion 11a through the conductive gasket 12 realizes a sliding hard connection between the moving contact 13 and the connecting plate 11. Without affecting the resistance value of the moving contact assembly 10, the contact area is reduced, the rotational friction force between the connecting plate 11 and the moving contact 13 is reduced, the rotation of the moving contact 13 is smoother, and the operating force of the product is smaller. The moving contact assembly of this embodiment is applicable to molded case circuit breakers, and of course, it is also applicable to other switch devices where a hard connection structure is adopted between the moving contact and the wiring component.

[0075] As Figure 22 shown in the figure, the sliding structure between the conductive gasket 12 and the moving contact 13 of this embodiment. One side surface of the conductive gasket 12 is in contact connection with the connecting plate 11, and the other side surface of the conductive gasket 12 is a convex curved surface 12a. The moving contact 13 is provided with a curved surface groove 13c that is in sliding fit with the convex curved surface 12a. The sliding structure between the conductive gasket 12 and the moving contact 13 of this embodiment adopts the convex curved surface 12a and the curved surface groove 13c in sliding fit, with a simple structure. The arc contact effectively reduces the rotational friction force and makes the rotation more flexible. In addition, the smaller the friction force, the smaller the wear, and the service life is improved. Of course, the sliding structure between the conductive gasket 12 and the moving contact 13 can also adopt a sliding fit structure such as convex points and grooves.

[0076] Further, as Figure 21-22As shown in the figure, the moving contact assembly 10 of this embodiment further includes a compression spring 110. The moving contact mounting portion 13b and the two connecting plate mounting portions 11a are limited within the receiving groove 16c of the contact support 16 by the compression spring 110. The compression spring 110 is sleeved on the contact rotating shaft 14 and is pre-tensioned between the connecting plate mounting portion 11a and the wall of the receiving groove 16c. Specifically, there are two compression springs 110, and one compression spring 110 is provided between a single connecting plate mounting portion 11a and the corresponding contact support mounting portion 16b. The moving contact 13, the conductive gasket 12, the connecting plate 11, the compression spring 110, and the contact support 16 are connected together by the contact rotating shaft 14. The compression spring 110 is compressed to provide a clamping force, so that the connecting plate 11 is clamped with the conductive gasket 12 and the moving contact 13, increasing the contact pressure among the moving contact 13, the conductive gasket 12, and the connecting plate 11, improving the reliability of electrical contact. The elastic limiting structure is adopted so as not to affect the rotation of the moving contact 13. Of course, instead of using a compression spring, other elastic members can also be used.

[0077] As Figure 21-22 shown in the figure, both ends of the contact rotating shaft 14 are respectively inserted into two fixed bushings 140 and can rotate flexibly. Fixed grooves that are in interference fit with the bushings 140 are provided on both sides inside the unit housing 19. The bushings 140 are snapped into the fixed grooves of the unit housing 19 to achieve fixation. In this way, the direct cooperation and rotation between the metal contact rotating shaft 14 and the fixed grooves on the plastic unit housing 19 are converted into the rotation of the contact rotating shaft 14 within the copper bushings 140, reducing the wear of the fixed grooves and the influence on the rotational concentricity of the moving contact assembly 10.

[0078] As Figure 21-22 shown in the figure, one arc isolation piece 17 is provided on each outer side of both sides of the contact support 16. The arc isolation piece 17 can prevent arc particles from spraying out between the unit housing 19 and the contact support 16.

[0079] As Figure 21-22 shown in the figure, the moving contact assembly 10 of this embodiment further includes an insulating tail fin 15. One end of the insulating tail fin 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 fixation between the insulating tail fin 15 and the moving contact 13 is achieved through a rivet 150. The arc isolation portion 15a at the other end of the insulating tail fin 15 is arranged at an interval from the contact support 16; the insulating tail fin 15 blocks a large number of arc particles from spraying back into the contact support 16.

[0080] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when in use and commonly placed, and is only for the convenience of description, rather than indicating that the device or element referred to must have a specific orientation. Therefore, it should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating relative importance.

[0081] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. 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) arranged 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 latch (70), a locking latch (60) and a reclosing latch (80) which are respectively pivotally arranged on the bracket (40), a main spring (31) arranged between the rocker arm assembly (50) and the linkage rod (30), a first crank (71) pivotally arranged on the jump latch (70) and in limiting cooperation with the jump latch (70) and the linkage rod (30). The linkage rod (30) is linked with the contact support (16) through a transmission assembly. The circuit breaker further includes a quick-acting structure, and the quick-acting structure includes a first push rod (21), a second push rod (24) and a third push rod (25). The first push rod (21) is pivotally arranged and is in driving cooperation with the moving contact (13) and the second push rod (24) respectively. The second push rod (24) is pivotally arranged and is fixedly connected with 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 trip, and the reclosing latch (80) is provided with a reclosing latch driven arm (80b) in driving cooperation with the third push rod driving part (25a). During opening / closing, the rocker arm assembly (50) is rotated, the linkage rod (30) is driven by the main spring (31), the linkage rod (30) drives the moving contact (13) to rotate, so that the moving contact (13) is opened and closed with the static contact (18). The linkage rod (30) simultaneously drives the jump latch (70) through the first crank (71). The jump latch (70) and the locking latch (60) are kept in the locked state, and the locking latch (60) is also kept in the locked state with the reclosing latch (80). When the moving contact (13) is electrically repelled by the short-circuit current, the moving contact (13) rotates and acts 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 acts on the reclosing latch driven arm (80b) through the third push rod driving part (25a), driving the reclosing latch (80) to rotate until it is unlocked from the locking latch (60), and the locking latch (60) rotates until it is unlocked from the jump latch (70), driving the jump latch (70) to rotate, driving the linkage rod (30) to drive the moving contact (13) to rotate, so that the moving contact (13) is disconnected from the static contact (18).

2. The circuit breaker according to claim 1, characterized in that: The reclosing latch (80) includes a reclosing latch mounting part (80e). The reclosing latch mounting part (80e) is pivotally arranged on the bracket (40) through a reclosing latch rotating shaft (81). One side of the reclosing latch mounting part (80e) is provided with a reclosing latch locking feature (80a) in locking cooperation with the locking latch (60), and the other side is provided with the reclosing latch driven arm (80b). The end slope (80d) of the reclosing latch driven arm (80b) is used for driving cooperation with the third push rod driving part (25a). The middle part of the reclosing latch driven arm (80b) is provided with a reclosing latch limiting feature (80c) for limiting the rotation angle of the reclosing latch (80), and the bracket (40) is provided with a bracket stop boss (41a) in abutting cooperation with the reclosing latch 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 connection 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 is snap-fitted with a 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 static contact (18) are arranged inside the unit housing (19). The moving contact (13) and the first push rod (21) are pivotally arranged on the contact support (16). The second push rod (24) is rotatably arranged inside the unit housing (19), and is provided with a coupling boss (24a) that extends outside the unit housing (19) and is fixedly connected to the third push rod (25).

5. The circuit breaker according to claim 4, wherein: The second push rod (24) has a round shaft structure. The round shaft structure of the second push rod (24) is rotatably fitted with two side walls of the unit housing (19). Both ends of the second push rod (24) are provided with coupling bosses (24a) fixedly connected to the third push rod (25). A second push rod receiving part (24b) protruding to one side is provided on the radial direction of the middle part of the round shaft structure. The second push rod receiving part (24b) is drivingly fitted 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 arranged. 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 is drivingly fitted with the first push rod receiving surface (21a). The second push rod (24) is provided with a second push rod receiving part (24b) that is drivingly fitted with the first push rod driving surface (21b). The moving contact (13) and the first push rod (21) are pivotally arranged on the contact support (16) of the moving contact assembly (10). When 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 receiving part (24b). The first push rod receiving surface (21a) is opposite and spaced from the moving contact driving part (13e), and at the same time, the first push rod driving surface (21b) is opposite and spaced from the second push rod receiving part (24b).

7. The circuit breaker according to claim 1, characterized in that: The latch (60) includes a locking plate (60c). The top end of the locking plate (60c) is provided with a protruding latch locking feature (60a) for locking and mating with the re-latch (80). The bottom end of the locking plate (60c) is provided with a recessed latch latching feature (60b) for locking and mating with the jump latch (70). The two sides of the bottom end of the locking plate (60c) are also provided with latch mounting feet (60e). The latch mounting feet (60e) are pivotally arranged on the bracket (40) through a latch rotating shaft (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 arranged on the jump buckle (70) through the first crank rotating shaft (710). The second corner of the first crank (71) is provided with a first crank limiting portion (711) that is in limiting cooperation with the jump buckle (70). The third corner of the first crank (71) is provided with a limiting notch (71a) that is in limiting cooperation 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 arranged on the bracket (40) through the jump buckle rotating shaft (72). The other end of the jump buckle (70) is provided with a protruding jump buckle locking feature (70a) for locking cooperation with the buckle (60). A jump buckle limiting portion is arranged between the jump buckle rotating shaft (72) and the first crank rotating shaft (710) in the middle of the jump buckle (70) for limiting cooperation with the first crank (71).

10. The circuit breaker according to claim 1, characterized in that: The moving contact (13) is pivotally arranged on the contact support (16) of the moving contact assembly (10) through the contact rotating shaft (14). The linkage rod (30) is linked with the contact support (16) through a transmission assembly, driving the contact support (16) and the moving contact (13) to rotate around the contact rotating shaft (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 arranged on the contact rotating shaft (14). The third corner of the second crank (93) is hinged to the transmission shaft (160).

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