Circuit breaker assembly

Abstract

The utility model relates to a circuit breaker assembly (200) comprising a plurality of circuit breakers (300), and each circuit breaker (300) is provided with a housing, a control mechanism (310), a transmission mechanism (320), a contact assembly (330), an arc striking chamber (360) and an arc extinguishing chamber (370). The transmission mechanism (320) is provided with a lock catch (321), a jump pin (322) and an inverted triangular carrier (323), and the carrier (323) is provided with a first pivoting part (3231) which is roughly located at the gravity center of the carrier (323) and is in pivoting connection with the jump pin (322). The second pivoting part (3232) is respectively positioned at each vertex part of the inverted triangular structure of the carrier (323) and is pivotally connected with the lock catch (321); and the third pivoting part (3233) is pivotally connected with the moving contact row (3321). According to another aspect of the utility model, a static contact magnetism increasing sheet (3312) is laid on the inner surface of the tapered tip part of the third extension part (33113) of the static contact row (3311).

Description

Technical Field

[0001] The utility model relates to a circuit breaker component, in particular to a circuit breaker component with reduced geometric dimensions and more effective arc striking and arc extinguishing effects. Background Art

[0002] A circuit breaker (CB), also known as an air switch or no-fuse circuit breaker (NFB), is an electrical safety device used to protect circuits from overcurrent. It is used in normal circuit conditions, as well as in situations where the current exceeds the rated current of the equipment or the current-carrying capacity of the conductor due to circuit overload, short circuit, arcing, or ground fault. It is designed to manually or automatically open (close and disconnect) the circuit or automatically cut off the faulty circuit to protect the equipment (appliances in the circuit), prevent damage to conductor insulation, and mitigate fire risks.

[0003] Circuit breakers are generally consumable products, and in the prior art, they are often constructed with a single-contact structure to reduce the overall size of the circuit breaker, thereby reducing the cost of its manufacturing process. However, when interrupting current, especially short-circuit current, due to the short creepage distance, it is usually induced that the conductive parts such as the contacts are broken down by the arc. As a result, the contacts of the single-contact circuit breaker will be burned and carbonized, which directly deteriorates the opening and closing performance of the single-contact circuit breaker. On the other hand, due to its limited opening voltage, single-contact circuit breakers are mostly used in low-voltage places and are not suitable for medium and high voltage electric fields, such as the layout and application of 1500V (volt) photovoltaic power stations.

[0004] To address this technical problem, the prior art patent CN 109273330 B provides a dual-contact circuit breaker featuring a dual-contact structure, with two pairs of moving and stationary contacts sharing the breaking current, thereby improving breaking performance. In addition to the conventional circuit breaker components—a trip latch and a latch—this dual-contact circuit breaker also features a lever and a moving contact support for operating the closing action. The lever is complex in construction, not only featuring first mounting plates and first mounting holes on opposing sides, but also requiring the moving contact support to be mounted between the two first mounting plates and securely attached to the two second mounting side plates of the moving contact support. Furthermore, the lever features a first limit slot for limiting the trip latch's position. In other words, the trip latch, latch, moving contact support, and the thermally insulating energy storage member for thermal insulation and storing torsion spring motion are all partially housed within or mounted to the lever, resulting in a complex control system. Furthermore, since the circuit breaker has many parts and its double-contact structure and mutual connection are relatively complex, the circuit breaker is relatively large and requires a relatively large space to accommodate the installation of such a double-contact circuit breaker.

[0005] Furthermore, although the invention patent as a prior art discloses a bent static contact structure, the bent structure only partially faces and covers the open part of the arc extinguishing chamber. That is, during the circuit breaker opening operation caused by overcurrent, there will be defects such as the arc not being completely introduced into the arc extinguishing chamber, resulting in poor arc striking and arc extinguishing effects, thereby causing burning of other conductive components inside the circuit breaker or damage to insulating components, thereby causing premature scrapping of the circuit breaker. Utility Model Content

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the double-contact circuit breaker described in the prior art, such as the large number of parts, the relatively complex double-contact structure and the connection between them, resulting in a large volume, and poor arc striking and arc extinguishing effects.

[0007] In order to solve the above technical problems, the utility model provides a circuit breaker assembly, which includes a plurality of circuit breakers, wherein each circuit breaker has a housing, an operating mechanism, a transmission mechanism, a contact assembly, an arc striking chamber and an arc extinguishing chamber.

[0008] The transmission mechanism has a lock, a jump lock and a carrier configured as an inverted triangle, wherein the carrier is provided with a first pivot point approximately located at its center of gravity, and a second pivot point, a third pivot point and a fourth pivot point respectively located at the vertices of the inverted triangle configuration of the carrier.

[0009] The contact assembly includes a stationary contact assembly comprising a plurality of stationary contact banks and a movable contact assembly comprising a plurality of movable contact banks. The stationary contact banks are configured with a first, vertically arranged extension portion, a second, transversely extending extension portion, and a third, tapered extension portion connecting the first and second extension portions and extending obliquely toward the movable contact banks. The latch is configured with a pivotal connection at its center of gravity that engages with a first pivot portion of the carrier, the latch is pivotally connected to a second pivot portion of the carrier, and the movable contact banks are pivotally connected to a third pivot portion of the carrier. A stationary contact magnetizing sheet is also provided on the inner surface of the tapered tip of the third extension portion of the stationary contact bank.

[0010] The carrier constructed in the shape of an inverted triangle and the arrangement of the inverted triangular pivot portion located thereon not only fully utilize the inertia of the triangle when rotating around its center of gravity, making the pivotal movement of each transmission component around the first pivot portion lighter, but also effectively reduces the space occupied by each component, thereby reducing the volume of the entire transmission mechanism and even the entire relay assembly.

[0011] Furthermore, the first pivot portion of the carrier extends from the base of the carrier along the vertical height direction and passes through the pivot portion of the trip latch and is pivotally connected to the housing of the circuit breaker.

[0012] Furthermore, the first pivoting portion, the second pivoting portion and the third pivoting portion of the carrier are all configured to have through holes.

[0013] According to one aspect of the present invention, the jump buckle has substantially the same longitudinal dimension as the carrier and comprises a first extension portion and a second extension portion, wherein the first extension portion and the second extension portion extend in opposite directions along the longitudinal direction of the jump buckle and are spaced apart in the transverse direction of the jump buckle.

[0014] Furthermore, the first extension portion of the jump buckle abuts against the fourth pivoting portion of the carrier.

[0015] Furthermore, the fourth pivoting portion of the carrier is a columnar extension extending from the base of the carrier in the vertical direction.

[0016] According to one aspect of the present invention, the movable contact row is a double-contact structure, and comprises a movable contact portion and a movable contact protrusion portion extending from a pivot portion thereof substantially in opposite directions along a longitudinal direction.

[0017] Furthermore, the moving contact protrusion has an arc segment that abuts against the first pivoting portion of the carrier.

[0018] According to one aspect of the present invention, the static contact magnetizing sheet is configured to conform to the inner surface of the tapered tip of the third extending portion of the static contact row and occupies at least half of the area of the third extending portion of the static contact row.

[0019] According to another aspect of the present invention, the second extension portion of the static contact row is generally located above the arc extinguishing chamber, and the arc extinguishing chamber has a plurality of transversely arranged arc extinguishing grids; and the third extension portion of the static contact row and the moving contact protrusion of the moving contact row are located in the arc striking chamber.

[0020] The provision of the third extension portion of the static contact row and the static contact magnetizing sheet laid on the inner surface of the tapered tip of the third extension portion of the static contact row further enhance the arc striking and arc extinguishing effects of the circuit breaker, effectively avoiding creepage of conductive components inside the circuit breaker.

[0021] Some of the other features and advantages of the present invention will be apparent to those skilled in the art after reading this application, and the other parts will be described in the following detailed description in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings herein are incorporated in and constitute a part of the specification, and illustrate embodiments consistent with the present invention. They are merely exemplary and explanatory and do not limit the present invention.

[0023] Figure 1A three-dimensional view of a prior art circuit breaker assembly is shown, which has a larger geometric size;

[0024] Figure 2 A three-dimensional view of a circuit breaker assembly according to a non-limiting embodiment of the present invention is shown, which has reduced geometric dimensions relative to circuit breaker assemblies of the prior art;

[0025] Figure 3 Shown Figure 2 A three-dimensional view of a circuit breaker in the circuit breaker assembly shown, specifically showing the circuit breaker transmission mechanism;

[0026] Figure 4 Shown Figure 2 A three-dimensional view of one of the circuit breakers in the circuit breaker assembly is shown with its rear housing and intermediate housing removed, specifically showing the operating assembly, electromagnetic trip assembly, and overload protection assembly of the circuit breaker;

[0027] Figure 5 Shown from another perspective Figure 2 A three-dimensional view of one of the circuit breakers in the circuit breaker assembly is shown with its rear housing removed, specifically illustrating the structure of the carrier;

[0028] Figure 6 Shown Figure 2 The structure of the electromagnetic trip assembly and the static contact assembly of a circuit breaker in the circuit breaker assembly shown;

[0029] Figure 7 Shown Figure 2 The structure of the arc striking chamber and the arc extinguishing chamber of a circuit breaker in the circuit breaker assembly shown;

[0030] Figure 8 Shown Figure 2 The structure of a carrier of a circuit breaker in the circuit breaker assembly shown;

[0031] Figure 9 Shown Figure 8 A front view of a carrier of the circuit breaker is shown;

[0032] Figure 10 Shown Figure 2 The transmission mechanism of one of the circuit breaker components in the circuit breaker assembly is shown.

[0033] Reference numerals

[0034] 100 Prior art circuit breaker assembly

[0035] 200 Circuit breaker assembly 300 Circuit breaker 310 Operating mechanism 320 Transmission mechanism 321 Lock 322 Jumper 3221 First extension 3222 Second extension 323 Carrier 3231 First pivoting portion 3232 Second pivoting portion 3223 Third pivoting portion 3234 Fourth pivoting portion

[0036] The first side of the virtual triangle is T1. The second side of the virtual triangle is T2. The third side of the virtual triangle is T3.

[0037] 330 Contact assembly 331 Stationary contact assembly 3311 Stationary contact row 33111 First extension portion 33112 Second extension portion 33113 Third extension portion 3312 Stationary contact magnetizing sheet

[0038] 332 moving contact assembly 3321 moving contact row 33211 moving contact point 33212 moving contact protrusion

[0039] 340 Electromagnetic trip assembly 341 Electromagnetic ejector 342 Protective housing

[0040] 350 Overload protection component 351 Double metal parts 352 Overload release part 3521 First pivot end

[0041] 360 Arc striking chamber 361 Gas generating plate 362 Magnetizing plate 363 Arc striking plate 370 Arc extinguishing chamber 371 Arc extinguishing grid DETAILED DESCRIPTION

[0042] The present invention is described below with reference to the figures. It should be understood that the embodiments listed below are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. The figures are provided to present multiple embodiments of the present invention, but the figures do not have to be drawn according to the dimensions of the specific embodiments, and certain features may be enlarged, removed, or partially cut away to better illustrate and explain the disclosure of the present invention. Some components in the figures can be repositioned according to actual needs without affecting the technical effects. The phrase "in the figures" or similar terms appearing in the specification do not necessarily refer to all figures or examples.

[0043] Certain directional terms used in the following description of the figures, such as "inner," "outer," "upper," "lower," "top," "bottom," and other directional terms, will be understood to have their normal meanings and refer to those directions associated with normal viewing of the figures. Unless otherwise indicated, the directional terms described in this specification are generally in accordance with conventional directions understood by those skilled in the art.

[0044] The terms "first," "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are used to distinguish one component from other components. The expression "substantially" allows for a reasonable range of angular deviation and does not necessarily mean complete consistency.

[0045] Some embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0046] Figures 2 to 3 1 and 2 respectively show a three-dimensional view of a circuit breaker assembly and a circuit breaker in the circuit breaker assembly according to a non-limiting embodiment of the present invention, wherein the circuit breaker 200 is relative to Figure 1 The circuit breaker 100 shown as the prior art has a reduced geometric size. The circuit breaker assembly 200 is composed of a plurality of identical circuit breakers 300 arranged adjacent to each other and connected in series. Figure 2 1 shows a state where four circuit breakers 300 are connected in series. Figure 3 and Figure 4 Each circuit breaker 300 has an operating mechanism 310, a transmission mechanism 320, a contact assembly 330, an electromagnetic trip assembly 340 and an overload protection assembly 350, so that the electromagnetic trip assembly 340 can be used to provide overcurrent protection when the circuit is short-circuited, and the overload protection assembly 350 can be used to provide overload protection when a device in the circuit operates beyond its normal full-load rating or a conductor exceeds its rated current.

[0047] In a non-limiting embodiment of the present invention, the transmission mechanism 320 includes a lock buckle 321, a jump buckle 322, and a carrier 323. Figure 8 and Figure 9 , and compare Figure 4 and Figure 10 The carrier 323 is a plate-like component that is generally in the shape of an inverted triangle. Figure 8The diagram shows a first side T1, a second side T2, and a third side T3 of a virtual triangle enclosing the carrier 323. Furthermore, the carrier 323 is provided with a first pivot point 3231 approximately at its center of gravity. The first pivot point 3231 extends through the tripper 322 and is pivotally connected to the rear and front housings of the circuit breaker 300. This directly enables pivotal movement between the tripper 322 and the carrier 323, as well as between the carrier 323 and the rear and front housings of the circuit breaker 300, via the first pivot point 3231. The carrier 323 is further provided with a second pivoting portion 3232 and a third pivoting portion 3233. The second pivoting portion 3232 and the third pivoting portion 3233 are substantially located at the same side of the triangular configuration of the carrier 323 and are spaced apart from each other to form a pivotable connection between the second pivoting portion 3232 of the carrier 323 and the lock 321, and a pivotable connection between the third pivoting portion 3233 of the carrier 323 and the contact element of the circuit breaker 300. The sides of the triangular configuration of the carrier 323 are at Figure 8 The diagram is shown near the first side T1 of the virtual triangle enveloping the carrier 323. The inverted triangle shape of the carrier 323 and the triangular pivoting arrangement formed by its first, second, and third pivoting portions 3231, 3232, and 3233 allow for pivotal movement between the carrier 323, the trip latch 322, the latch 321, and the contact elements of the circuit breaker 300 within a limited space. This effectively disperses stress concentration on the carrier 323, a crucial transmission component, during the manufacturing process, reduces the dimensions of the connections between the various components of the transmission mechanism 320, and, compared to prior art relays, reduces the number of transmission components within the transmission mechanism, effectively minimizing raw material loss and lowering manufacturing costs. Furthermore, the first, second, and third pivoting portions 3231, 3232, and 3233 of the carrier 323 are all configured as through-holes, reducing the overall weight of the carrier 323 and facilitating pivotal movement between the carrier 323 and the other transmission components.

[0048] In a specific embodiment of the present invention, the carrier 323 further comprises a fourth pivot point 3234 at the end of its inverted triangle configuration, away from the second pivot point 3232 and the third pivot point 3233. This fourth pivot point 3234 is a columnar portion constructed on the base of the carrier 323 and extending in the vertical direction. This helps form an energy-storage connection with the overload protection assembly of the circuit breaker 300 and facilitates energy-storage closing of the circuit breaker after opening. Thus, the fourth pivot point 3234, together with the second pivot point 3232 and the third pivot point 3233, forms an inverted triangle surrounding the center of the first pivot point 3231. This arrangement of the inverted triangle-shaped pivoting portion, which is similar to the inverted triangle configuration of the carrier 323, not only effectively disperses the pivoting torque of the carrier relative to the trip latch 322, the lock latch 321, and the contact element of the circuit breaker 300, but also cleverly utilizes the inertia of the triangle during movement, making the pivoting movement of the various transmission components around the first pivoting portion 3231 at the center of gravity more lightweight. Figure 8 and Figure 9 .

[0049] In one embodiment of the present invention, the jumper 322 is configured to have substantially the same longitudinal dimension as the carrier 323. Figure 10 . Furthermore, the trip latch 322 also has a pivot portion located substantially at its center of gravity, and the pivot portion is rotatably connected to the first pivot portion 3231 of the carrier 323. The trip latch 322 also has a first extension portion 3221 and a second extension portion 3222 extending in opposite directions along its longitudinal direction along its pivot portion, respectively. The first extension portion 3221 and the second extension portion 3222 are offset a distance in the lateral direction of the trip latch 322 to facilitate pivoting. The first extension portion 3221 and the second extension portion 3222 are designed to have substantially the same length and volume, so as to facilitate the easy rotation of the trip latch 322 during the circuit breaker and closing process by means of the similar weight and motion inertia of the two extension portions. Furthermore, the first extension portion 3221 abuts against the fourth pivot portion 3234 of the carrier 323, and the first extension portion 3221 of the trip latch 322 is pivotally connected to the overload protection component of the circuit breaker 300, thereby realizing the circuit breaker's circuit breaking protection function in which the overload protection component, such as a bimetallic element, is deformed or melted by the overload current under overload conditions.

[0050] In one embodiment of the present invention, the contact assembly 330 includes a static contact assembly 331 and a moving contact assembly 332. Figure 3 and Figure 4. The moving contact assembly 332 is constructed to have a plurality of moving contact rows 3321 arranged in parallel. Here, an embodiment of the present invention is further described by taking a moving contact row 3321 as an example. The moving contact row 3321 is a double-contact structure symmetrically arranged along its longitudinal plane, thereby increasing the contact spacing of a single circuit breaker, improving the operating voltage, and also improving the point life and short-circuit breaking capacity. In particular, the pivot part of the symmetrically arranged double-contact configuration of the moving contact row 3321 partially surrounds the two end sides of the third pivot part 3233 of the carrier 323 and forms a pivotable connection with the third pivot part 3233 of the carrier 323, so as to effectively reduce the pivot space between the moving contact row 3321 and the carrier 323. Furthermore, each contact structure of the moving contact row 3321 extends from its pivot position generally in the opposite direction along its longitudinal direction to form a moving contact portion 33211 and a moving contact protrusion 33212, wherein the moving contact protrusion 33212 constructs a partial arc surface, which abuts against the outer periphery of the first pivot position 3231 of the carrier 323 to realize the pivoting and pushing movement between the moving contact row 3321 and the carrier 323; and the moving contact protrusion 33212 is also constructed to have a more compact size than the moving contact row in the prior art to reduce the installation space of the moving contact row.

[0051] In one embodiment of the present invention, the overload protection assembly includes at least a double metal component 351 and an overload release component 352. The overload release component 352 is generally rod-shaped and has a first pivot end 3521 with a waist-shaped hole. The first pivot end 3521 is pivotally connected to the second extension 3222 of the tripping latch 322. In particular, the overload release component 352 is generally orthogonal to the moving contact protrusion 33212 of the moving contact row 3321, so that the tripping latch 322 is pulled horizontally to rotate counterclockwise to achieve the disengagement movement between the tripping latch 322 and the lock latch 321. For details, see Figure 10 .

[0052] According to another aspect of the present invention, the static contact assembly 331 is configured to include a plurality of static contact rows 3311 arranged in parallel and corresponding to the movable contact rows 3321. Figure 6. Here, an embodiment of the present invention is further described by taking a static contact row 3311 as an example. The static contact row 3311 is also a double-contact structure symmetrically arranged along its longitudinal plane. Specifically, each contact structure in the static contact row 3311 has a first extension portion 33111 and a second extension portion 33112. Specifically, the first extension portion 33111 of the static contact row 3311 is arranged vertically and fixed to the protective shell 342 of the electromagnetic trip assembly 340; the second extension portion 33112 of the static contact row 3311 is arranged horizontally. Furthermore, between the first extension portion 33111 and the second extension portion 33112 is a third extension portion 33113 that extends obliquely toward the moving contact row 3321 and has a tapered tip. Unlike conventional stationary contact assemblies, a stationary contact magnetizing sheet 3312 is further disposed within the third extension portion 33113. This stationary contact magnetizing sheet 3312 is also specifically configured to have a tapered tip and is secured to the tapered tip of the third extension portion 33113 of the stationary contact row 3311 via a form-fitting mechanism. Preferably, the stationary contact magnetizing sheet 3312 occupies at least half the area of the third extension portion 33113 of the stationary contact row 3311.

[0053] According to another aspect of the present invention, an arc striking chamber 360 and an arc extinguishing chamber 370 are provided below the static contact row 3311 and the moving contact row 3321. The arc striking chamber 360 and the arc extinguishing chamber 370 are arranged opposite to each other. Figure 5 and Figure 7 Specifically, the arc striking chamber 360 is formed between two parallel gas-generating sheets 361, and is enclosed by an arc-shaped arc-generating sheet 363 on the side of the arc striking chamber 360 near the moving contact. The arc striking chamber 360 receives most of the third extension portion 33113 of the stationary contact row 3311, which extends obliquely and has a tapered tip, as well as the moving contact protrusion 33212 of the moving contact row 3321. Furthermore, the side of the gas-generating sheet 361 is engaged with a sheet-like magnetizing sheet 362 in a form-fitting manner. The magnetizing sheet 362 substantially covers the side of the gas-generating sheet 361, thereby confining the arc generated by the stationary contact row 3311 and the moving contact row 3321 during circuit breaking to within the arc striking chamber 360.

[0054] In a specific embodiment of the present invention, the arc-extinguishing chamber 370 is composed of multiple horizontally arranged arc-extinguishing grids 361. Specifically, each arc-extinguishing chamber 370 is provided with 13 arc-extinguishing grids 371, each arranged parallel to one another and equally spaced. Each arc-extinguishing grid 371 has arc-extinguishing slots facing the static contact row 3311, effectively enhancing the arc-extinguishing capability of the arc-extinguishing chamber 370. In particular, according to the concept of the present invention, the arc-extinguishing grids 371 are located below the second extension portion 33112 of the static contact row 3311 and partially extend below the obliquely arranged third extension portion 33113 of the static contact row 3311, thereby creating an arc-extinguishing space suitable for a single static contact. Preferably, the multiple arc-quenching grids 371 that partially extend below the third extension 33113 of the stationary contact row 3311 are first shaped in increasing sizes to conform to the inclined configuration of the third extension 33113, and then aligned with the longitudinal contours of the gas-generating plates 361 to create a relatively enclosed arc-extinguishing space. More preferably, the arc-quenching troughs of each arc-quenching grid 371 have substantially the same width as the stationary contact 3311 at the end facing the stationary contact 3311 to receive the arc from the contact, and have a tapered, closed surface at the end facing away from the stationary contact 3311 to confine the received arc within the arc-quenching troughs.

[0055] Given the specific construction of the carrier 323, a key transmission component, in the transmission mechanism 320 of the present invention, other transmission components are also adapted to have reduced dimensions within the carrier 323 to accommodate the corresponding circuit breaker housing. Consequently, the dimensions of the circuit breaker 300 can be reduced to two-thirds that of the conventional circuit breaker assembly 200, with a maximum module width of 18 mm. Furthermore, four circuit breakers 300 of the present invention can be connected in series to accommodate high-voltage applications such as 1500V photovoltaic power plants, with a total width of the circuit breaker 300 of at most 72 mm.

[0056] The advantages of the circuit breaker structure according to the present invention are further explained below by taking the overcurrent short-circuit protection opening and the overload protection opening as examples.

[0057] When an overcurrent occurs in the circuit, the electromagnetic trip assembly 340 receives an overcurrent signal from the wiring terminal, and the electromagnetic push rod 341 in the electromagnetic trip assembly 340 moves toward the tripper 322, thereby pushing the tripper 322 to rotate counterclockwise about the first pivot point 3231 of the carrier 323, thereby unlocking the tripper 322 from the lock 321. During the counterclockwise rotation of the tripper 322 about the first pivot point 3231 of the carrier 323, the movable contacts of the movable contact row 3321 are electrically disconnected from the static contacts of the static contact row 3311. Because the movable contact portions 33211 of the movable contact row 3321 and the third extensions 33113 of the stationary contact row 3311 are generally housed within an arc striking chamber 360 formed by two parallel gas-generating sheets 361 equipped with sheet-like magnetizing sheets 362 and arc-shaped arc-strike sheets 363, when the movable contacts of the movable contact row 3321 and the stationary contacts of the stationary contact row 3311 are electrically disconnected, the arc generated by the disconnection is elongated. The surfaces of the gas-generating sheets 361 are heated and vaporized by the arc, thereby generating a primary thrust through the gas flow that draws the arc from the arc striking chamber 360 into the arc extinguishing chamber 370. Simultaneously, the sheet-like magnetizing sheets 362 on either side of the gas-generating sheets 361 generate a magnetic field under the influence of the arc current, creating a secondary thrust that confines the arc to the arc striking chamber 360 and draws it into the arc extinguishing chamber 370, further propelling the arc toward the arc extinguishing chamber 370. In particular, the static contact magnetizing plates 3312 with tapered tips, which are arranged on the inner surface of the third extension 33113 of the static contact row 3311, further create an arc-pushing magnetic field, generating a third thrust that draws the arc into the arc-extinguishing chamber 370. This thrust first pushes the arc downward to the arc-extinguishing grid 371 at the bottom of the arc-extinguishing chamber 370, and then pushes the truncated arc laterally into the arc-extinguishing space formed between every two arc-extinguishing grids 371. More particularly, the conformal design of the inclined third extension 33113 of the static contact row 3311 and the multiple arc-extinguishing grids 371, as well as the conformal design of the multiple arc-extinguishing grids 371 and the gas-generating plates 361 in their longitudinal direction, further facilitates confining the arc within the arc-starting chamber 360 and the arc-extinguishing chamber 370. Specifically, the arc generated by the disconnection of the moving and static contacts flows downward along the third extension portion 33113 of the static contact bank 3311, then flows along the outer surface of the tapered tip of the third extension portion 33113 of the static contact bank 3311 to the second extension portion 33112 of the static contact bank 3311. Furthermore, because the static contact magnetizing plate 3312 with a tapered tip occupies roughly half the area of the third extension portion 33113 of the static contact bank 3311, the arc's direction of flow is more effectively defined, preventing the arc from causing creepage on other conductive components within the circuit breaker. Furthermore, the arc generated by the automatic contact bank 3321 jumping to the arc-starting plate 363 can also flow along the inner surface of the arc-starting plate 363 into the arc extinguishing chamber, thereby fully enclosing the arc and ensuring effective arc extinguishing.

[0058] When a current overload occurs in the circuit, the dual metal component 351 in the overload protection assembly 350 deforms due to heat, driving the overload release member 352 to move laterally. The first pivot end 3521 of the overload release member 352 pulls the second extension 3222 of the tripper 322 to pivot counterclockwise about the first pivot point 3231 of the carrier 323. The tripper 322, in turn, drives the carrier 323 to pivot counterclockwise. As a result, the first extension 3221 of the tripper 322 biases the fourth pivot point 3234 of the carrier 323 against which it abuts, causing the movable contact protrusions 33212 of the movable contact row 3321 to pivot counterclockwise along with the carrier 323, disconnecting the movable contacts of the movable contact row 3321 from the stationary contacts of the stationary contact row 3311. During the power-off process due to current overload, the arc striking and arc extinguishing processes are the same as those of the aforementioned overcurrent short-circuit protection, and will not be described in detail here.

[0059] Although specific embodiments of the present invention have been illustrated and described, it will be apparent to those skilled in the art that many other changes and modifications may be made without departing from the spirit and scope of the present invention. Therefore, it is intended that all such changes and modifications within the scope of the present invention be encompassed in the appended claims.

Claims

1. A circuit breaker assembly (200), comprising a plurality of circuit breakers (300), wherein each circuit breaker (300) comprises a housing, an operating mechanism (310), a transmission mechanism (320), a contact assembly (330), an arc striking chamber (360), and an arc extinguishing chamber (370), wherein: The transmission mechanism (320) comprises a lock buckle (321), a jump buckle (322), and a carrier (323) configured in an inverted triangle shape, wherein the carrier (323) is provided with a first pivoting portion (3231) approximately located at the center of gravity thereof, and a second pivoting portion (3232), a third pivoting portion (3233), and a fourth pivoting portion (3234) respectively located at the vertices of the inverted triangle-shaped carrier (323); The contact assembly (330) comprises a stationary contact assembly (331) comprising a plurality of stationary contact rows (3311) and a moving contact assembly (332) comprising a plurality of moving contact rows (3321); wherein the stationary contact row (3311) is provided with a first extending portion (33111) arranged vertically and a second extending portion (33112) extending laterally, and a third extending portion (33113) connecting the first extending portion (33111) and the second extending portion (33112) and extending obliquely toward the moving contact row (3321) and having a tapered tip; Wherein, the jump buckle (322) is constructed at its center of gravity to form a pivotal connection to the first pivot part (3231) of the carrier (323), the lock buckle (321) is pivotally connected to the second pivot part (3232) of the carrier (323), and the moving contact row (3321) is pivotally connected to the third pivot part (3233) of the carrier (323); the inner surface of the tapered tip of the third extension part (33113) of the static contact row (3311) is paved with a static contact magnetizing sheet (3312).

2. The circuit breaker assembly (200) according to claim 1, characterized in that: The first pivoting portion (3231) of the carrier (323) extends from the base of the carrier (323) along the vertical height direction and passes through the pivoting portion of the trip latch (322) and is pivotally connected to the housing of the circuit breaker (300).

3. The circuit breaker assembly (200) according to claim 2, characterized in that: The first pivoting portion (3231), the second pivoting portion (3232) and the third pivoting portion (3233) of the carrier (323) are all configured with through holes.

4. The circuit breaker assembly (200) according to claim 1, characterized in that: The longitudinal dimensions of the jump buckle (322) and the carrier (323) are substantially the same, and the jump buckle (322) has a first extension portion (3221) and a second extension portion (3222); wherein the first extension portion (3221) and the second extension portion (3222) extend in opposite directions along the longitudinal direction of the jump buckle (322) and are spaced apart in the transverse direction of the jump buckle (322).

5. The circuit breaker assembly (200) according to claim 4, characterized in that: The first extension portion (3221) of the jump buckle (322) abuts against the fourth pivoting portion (3234) of the carrier (323).

6. The circuit breaker assembly (200) according to claim 4, characterized in that: The fourth pivoting portion (3234) of the carrier (323) is a columnar extension extending from the base of the carrier (323) in the vertical direction.

7. The circuit breaker assembly (200) according to claim 1, characterized in that: The movable contact row (3321) is a double-contact structure and comprises a movable contact portion (33211) and a movable contact protrusion (33212) extending in opposite directions from a pivot portion thereof substantially along a longitudinal direction.

8. The circuit breaker assembly (200) according to claim 7, characterized in that: The moving contact protrusion (33212) has an arc segment that abuts against the first pivoting portion (3231) of the carrier (323).

9. The circuit breaker assembly (200) according to claim 1, characterized in that: The static contact magnetizing plate (3312) is configured to conform to the inner surface of the tapered tip of the third extension portion (33113) of the static contact row (3311) and to occupy at least half of the area of the third extension portion (33113) of the static contact row (3311).

10. The circuit breaker assembly (200) according to claim 1, characterized in that: The second extension portion (33112) of the static contact row (3311) is generally located above the arc extinguishing chamber (370), and the arc extinguishing chamber (370) has a plurality of arc extinguishing grids (361) arranged laterally; and the third extension portion (33113) of the static contact row (3311) and the moving contact protrusion (33212) of the moving contact row (3321) are located in the arc striking chamber (360).

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