Terminal cover and circuit breaker

Abstract

The present invention discloses a terminal cover comprising a fixedly connected upper terminal cover and a lower terminal cover, each of which has a plurality of corresponding cavities, a partition provided within the cavities of the upper terminal cover, and an insulating baffle and an insulating surface. The metal baffles within the terminal cover can be used to deionize arcs, reducing arc energy during disconnection and shortening arcing distance, thereby preventing interphase or ground short circuits caused by arcs. The insulating baffles and insulating surface isolate free gas within the terminal cover from the wiring terminals and conductive copper busbars, preventing potential breakdown of the wiring terminals by free gas and ensuring electrical safety.

Description

Technical Field

[0001] The invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to a terminal cover and a circuit breaker. Background Art

[0002] In the power distribution system, when a short-circuit current occurs in the circuit, the circuit breaker will actively cut off the short-circuit current, thereby protecting the power distribution system and ensuring the safety of personnel, equipment and the entire circuit. However, the circuit breaker itself will generate a lot of energy when extinguishing the arc, and most of the energy will be ejected from the arc extinguishing chamber of the circuit breaker in the form of an arc. If the circuit breaker's own arc extinguishing ability or insulation system is not good, the ejected arc will easily spray onto the wiring terminal and the incoming line connection copper busbar, thereby causing a secondary short circuit between the wiring terminal and the incoming line connection copper busbar, and failing to achieve the true purpose of arc extinguishing. In addition, in order to eliminate the arc distance that causes a short circuit between the copper busbar and the busbar or a short circuit to the ground, a common practice is to install a terminal cover at the position of the arc spray port in front of the circuit breaker to prevent the arc from spreading to the surroundings and shorten the arc distance. The terminal cover of the molded case circuit breaker, as its external connection freeing device, has always been an important concern in the industry. However, the terminal covers currently available on the market generally have problems such as a single wiring method, cumbersome installation steps or low protection level, no isolation between the free gas and the external main circuit connection busbar, and possible breakdown hazards. For example Figure 1 and Figure 2 As shown, Chinese patent publication number CN109300746A discloses a terminal cover. The terminal cover of this structure needs to have a connection bar pre-installed in the terminal cover during installation. The installation steps are cumbersome and very inconvenient during installation and maintenance. Summary of the Invention

[0003] In order to solve at least one of the above problems, the present invention provides a terminal cover, which can effectively overcome the above problem.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A terminal cover comprises an upper terminal cover and a lower terminal cover which are fixedly connected. A plurality of cavities are respectively provided on the upper terminal cover and the lower terminal cover. A partition is provided in the cavity of the upper terminal cover. The terminal cover also comprises an insulating baffle and an insulating surface.

[0006] In a preferred embodiment, the insulating surface is arranged below the partition.

[0007] In a preferred embodiment, the insulating baffle and the insulating surface are provided on the upper terminal cover or the lower terminal cover.

[0008] In a preferred embodiment, an I-shaped positioning column is provided on the upper terminal cover and the lower terminal cover respectively.

[0009] In a preferred embodiment, the lower terminal cover is provided with an open slot extending from front to back.

[0010] On the other hand, the present invention also discloses a circuit breaker, comprising a casing, an arc extinguishing system, a static contact assembly, a moving contact assembly, an operating mechanism, a wiring terminal, a conductive copper busbar and the terminal cover, wherein the arc extinguishing system, the static contact assembly, the moving contact assembly and the operating mechanism are arranged in the casing, and is characterized in that the insulating surface is arranged between the conductive copper busbar and the partition of the upper terminal cover, and the insulating baffle is arranged between the wiring terminal and the partition of the upper terminal cover.

[0011] In a preferred embodiment, the circuit breaker further includes a static contact cover, which is a "B"-shaped structure and includes an arc-blocking portion, a horizontal portion, and a raised portion. The height of the arc-blocking portion is greater than the height of the static contact assembly. The arc-blocking portion is a vertical structure, and the horizontal portion is arranged between the arc-blocking portion and the raised portion. An open groove is provided on the static contact cover and is sleeved above the static contact assembly.

[0012] In a preferred embodiment, the static contact cover is sleeved on the outside of the static contact assembly, and the arc blocking portion is provided between the arc extinguishing system and the connection terminal.

[0013] In a preferred embodiment, the housing includes a base, and an open groove cooperating with the arc-blocking portion is provided on the base.

[0014] In a preferred embodiment, the housing further comprises a middle seat, on which a buckle is provided for cooperating with the arc-blocking portion.

[0015] In a preferred embodiment, a through hole is provided on the middle seat.

[0016] In a preferred embodiment, the static contact assembly includes a connecting plate, a reverse bending portion and an arc-striking piece, a static contact is provided on the reverse bending portion, and the arc-striking piece includes a connecting portion, a bending portion and an arc-guiding portion, the connecting portion is fixed below the reverse bending portion, the bending portion protrudes upward to be roughly flush with the static contact, and then bends downward to above the connecting plate, and the arc-guiding portion is roughly parallel to the connecting plate.

[0017] In a preferred embodiment, a magnetizing portion is provided on the connecting portion of the arc striking piece, and the magnetizing portion protrudes from the connecting portion and is flush with the static contact.

[0018] In a preferred embodiment, the arc extinguishing system is arranged above the arc guide portion.

[0019] The present invention adopts the above solution and has the following advantages compared with the prior art:

[0020] 1. An open groove is provided at the bottom of the static contact cover to facilitate the installation of the arc-starting piece and the static contact assembly;

[0021] 2. There is a raised part on the right side to protect the connecting plate and reduce the burning of the static contact;

[0022] 3. There is also a vertical arc-blocking part on the left side to isolate the free gas ejected from the wiring terminal and the arc extinguishing system, thereby protecting the static contact assembly and preventing arc burning;

[0023] 4. A hollow columnar structure is provided on the static contact cover to facilitate tool removal during maintenance or installation;

[0024] 5. By setting the metal partition inside the terminal cover, the arc can be ionized, the arc energy during disconnection can be reduced, and the arcing distance can be shortened to prevent the phase-to-phase or ground short circuit caused by the arc;

[0025] 6. By setting up insulating baffles and insulating surfaces, the free gas in the terminal cover is isolated from the wiring terminals and conductive copper busbars, avoiding the possible breakdown of the wiring terminals by the free gas and ensuring the safety of the electrical appliances;

[0026] 7. The terminal cover is set as an upper and lower split structure, and an open through slot is set on the lower terminal cover to accommodate the wiring copper busbar. There is no need to install the wiring copper busbar in advance during installation, which is convenient for wiring and easy to disassemble during maintenance, greatly saving time and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 Schematic diagram of the lower terminal cover structure of the background technology.

[0029] Figure 2 The figure is an exploded schematic diagram of a terminal cover of background technology.

[0030] Figure 3 Schematic diagram of the internal structure of the circuit breaker of the present invention.

[0031] Figure 4 It is a schematic diagram of the static contact structure of the present invention.

[0032] Figure 5 It is a schematic diagram of the arc-starting plate structure of the present invention.

[0033] Figure 6 It is a schematic structural diagram of the static contact cover of the present invention.

[0034] Figure 7 This is a schematic diagram of the assembly of the static contact cover and the static contact of the present invention.

[0035] Figure 8 This is an exploded schematic diagram of the static contact cover and the static contact of the present invention.

[0036] Figure 9 It is a partial schematic diagram of the assembly of the static contact cover and the circuit breaker base of the present invention.

[0037] Figure 10 It is a schematic diagram of the partial structure of the middle seat of the circuit breaker of the present invention.

[0038] Figure 11 This is a schematic diagram of the terminal cover of the present invention.

[0039] Figure 12 It is a schematic structural diagram of the lower terminal cover of the present invention.

[0040] Figure 13 This is a partial schematic diagram of the assembly of the terminal cover and the circuit breaker body of the present invention. DETAILED DESCRIPTION

[0041] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is intended to help understand the present invention, but does not constitute a limitation of the present invention.

[0042] Please refer to Figures 3 to 5 As shown, the present invention discloses a circuit breaker, which includes a body 10, which includes a housing 100, an arc extinguishing system 200, a static contact assembly 300, a moving contact assembly 400 and an operating mechanism 500. The arc extinguishing system 200, the static contact assembly 300, the moving contact assembly 400 and the operating mechanism 500 are arranged in the housing 100. A static contact 310 is fixed on the static contact assembly 300, and a moving contact 410 is provided on the moving contact assembly 400. Driven by the operating mechanism 500, the moving contact 410 of the moving contact assembly 400 contacts or separates from the static contact 321 of the static contact assembly 300, thereby achieving circuit connection or disconnection. The arc extinguishing system 200 is used to extinguish the arc generated when the moving contact assembly 400 and the static contact assembly 300 are disconnected, thereby ensuring electrical safety.

[0043] Specifically, the static contact assembly 300 includes a connecting plate 310 and a reverse bending portion 320. One end of the connecting plate 310 is provided with a protruding first bending structure 311. The first bending structure 311 is fixedly connected to the external conductive copper bus 600 through the wiring terminal 610. The static contact 321 is provided on the reverse bending portion 320. When the circuit is connected, the current is transmitted to the static contact assembly 300 through the conductive copper bus 600. The static contact 321 contacts the moving contact 410 of the moving contact assembly 400, thereby realizing the conduction of the circuit.

[0044] An arc-striking piece 330 is provided on the static contact assembly 300. The arc-striking piece 320 is fixedly connected to the static contact assembly 300. The arc generated when the moving contact assembly 400 and the static contact assembly 300 are disconnected can enter the arc extinguishing system 200 along the arc-striking piece 320, thereby achieving a better arc extinguishing effect. Specifically, the arc-striking piece 330 includes an integrally formed connecting portion 331, a bending portion 332, and an arc-guiding portion 333. The bending portion 332 is provided between the connecting portion 331 and the arc-guiding portion 333. The connecting portion 331 is provided below the static contact 321 and is fixedly connected to the reverse bending portion 320 by screws. Through holes for accommodating the passage of screws are provided on the reverse bending portion 320 and the connecting portion 331, respectively, thereby achieving the fixation of the arc-striking piece 330. The bent portion 332 is provided at the front end of the reverse bent portion 320, protruding upward until it is substantially flush with the static contact 321, and then bending downward to above the connecting plate 310. The arc guide portion 333 is sunken until it is parallel or nearly parallel to the connecting plate 310, and the arc extinguishing system 200 is provided above the arc guide portion 333. It should be noted that the arc guide portion 333 and the connecting plate 310 do not contact each other, and a gap is provided between them. In a preferred embodiment, an insulating plate may also be provided between the arc striking plate 330 and the connecting plate 310 to separate them.

[0045] In this embodiment, the connecting portion 331 is further provided with a magnetizing portion 334. These magnetizing portions 334 protrude from the connecting portion 331 and are located on either side of the static contact 321. Their height is flush with, or nearly flush with, the static contact 321. The magnetizing portions 334 and the connecting portion 331 are integrally formed, and the arc-starting piece 320 is made of ferromagnetic material. There can be one or more magnetizing portions 334. In this embodiment, there are two magnetizing portions 334, one on each side of the static contact 321.

[0046] When there is a short circuit fault in the line, the circuit breaker trips to separate the moving and static contacts, and an arc is generated between the moving and static contacts. Under the action of the electromagnetic force generated by the conductor such as the static contact connecting plate 310, the arc root near the static contact 300 side is transferred from the static contact 321 to the arc-striking piece 330. As the arc-striking piece 330 bends downward, the arc root near the static contact 300 side is transferred along the bending portion 332 to the arc guide portion 333 at the end of the arc-striking piece 330. At this time, the grid under the arc extinguishing system 200 arranged at the static contact 321 to the static contact connecting plate 310 smoothly participates in cutting the arc, thereby increasing the arc voltage when the circuit breaker is disconnected, extinguishing the arc quickly, and improving the breaking capacity of the circuit breaker. The space between the static contact and the static contact connecting plate can be fully utilized.

[0047] The arc-striking piece 330 is provided with a magnetizing portion 334 on both sides of the static contact 321, and its height is flush with or tends to be flush with the static contact 321. The advantage of this is that the magnetic field at the position of the static contact 321 is increased, so that during the circuit breaker disconnection process, the arc root can be quickly transferred from the static contact 321 to the arc-striking piece 330, thereby reducing the burning of the static contact 321 and avoiding the adverse consequence of the circuit breaker being unable to conduct after closing after disconnection.

[0048] Please refer to Figure 3 、 Figures 6 to 10As shown, the circuit breaker further includes a static contact cover 700 made of an insulating material. In this embodiment, the static contact cover 700 is made of plastic. The static contact cover 700 is sleeved over the static contact assembly 300 and has a generally "B"-shaped structure. Specifically, the static contact cover 700 includes an arc-blocking portion 710, a horizontal portion 720, and a raised portion 730. The horizontal portion 720 is disposed between the arc-blocking portion 710 and the raised portion 730 and is connected to both. The arc-blocking portion 710 and the horizontal portion 720 respectively cooperate with the connecting plate 310 of the static contact assembly 300. Specifically, the arc-blocking portion 710 cooperates with the first bending structure 311 of the connecting plate 310, and the horizontal portion 720 cooperates with the straight portion between the first bending structure 311 and the reverse bending portion 320 on the connecting plate 310. An open groove 712 cooperating with the first bending structure 311 is provided on the arc-blocking portion 710, and an open groove 722 cooperating with the straight portion of the connecting plate 310 is provided at the bottom of the horizontal portion 720. The straight portion is provided in the open groove 722. A gap-avoiding groove 721 is also provided on the horizontal portion 720 to accommodate the arc guide portion 333 of the arc-striking piece 330 to pass through, so as to facilitate the installation of the arc-striking piece 330. A protruding structure 722 is provided in the circumferential direction of the gap-avoiding groove 721 to increase the strength of the static contact cover 700. The raised portion 730 is sleeved on the outside of the reverse bending portion 320, and a cavity 731 for accommodating the reverse bending portion 320 is provided on the raised portion 730. The reverse bending portion 320 is provided in the cavity 731, and the static contact 321 is provided outside the cavity 731 to avoid being covered by the raised portion 730 and affecting its normal power supply.

[0049] It should be noted that the arc-blocking portion 710 is a vertical structure, and its height is greater than the height of the first bent structure 311 protruding from the connecting plate 310. During assembly, the arc-blocking portion 710 is arranged between the arc extinguishing system 200 and the terminal 610, thereby isolating the arc extinguishing system 200 and the terminal 610 and the conductive copper bus 600 connected to the terminal 610, thereby preventing the residual gas ejected from the arc extinguishing system 200 from causing a secondary short circuit between the terminal and the incoming conductive copper bus 600, thereby ensuring the safety of the electrical appliance.

[0050] The arc-blocking portion 710 is provided with a second bent structure 713, and a raised hollow columnar structure 714 is provided on the second bent structure 713. The hollow columnar structure 714 is correspondingly positioned above the wiring terminal 610, so that the user can connect the terminal through the hollow columnar structure 714. Reinforcing ribs 711 are also provided on both sides of the arc-blocking portion 710. The ribs 711 not only increase the strength of the arc-blocking portion 710, but also work together with the second bent structure 713 to ensure the assembly of the static contact cover 700 and the housing 100.

[0051] Specifically, in this embodiment, the housing 100 includes a base 110 and a middle base 120. The base 110 and the middle base 120 are fixedly connected. The base 110 is disposed below the middle base 120. The base 110 is provided with an open slot 111 that cooperates with the arc-blocking portion 710 and a protrusion 112 that cooperates with the second bent structure 713. The reinforcing rib 711 is embedded in the open slot 111 to ensure reliable insulation of the static contact cover 700, thereby preventing possible arc breakdown between the terminal 610 and the air outlet of the arc extinguishing system 200. Correspondingly, the middle base 120 is provided with a through hole 121. The head of the through hole 121 is provided with a circular groove 122 that cooperates with the hollow columnar structure 714. The head of the hollow columnar structure 714 extends into the circular groove 122, thereby providing space for user wiring. A buckle 123 is further provided on the middle seat 120 , and the buckle 123 engages with the second bending structure 713 , thereby achieving a fixed connection between the static contact cover 700 , the base 110 and the middle seat 120 .

[0052] The bottom of the static contact cover 700 is provided with openings 712 and 722 to facilitate installation of the arc-striking piece 330 and the static contact assembly 300. A raised portion 730 is provided on the right side to protect the coupling plate and reduce burn damage to the static contact. A vertical arc-blocking portion 710 is also provided on the left side to isolate the free gas ejected from the terminal block 610 and the arc-extinguishing system 200, thereby protecting the static contact assembly and preventing arc burn damage. A hollow columnar structure 714 on the static contact cover 700 facilitates tool removal during maintenance or installation.

[0053] For further information, please refer to Figures 11 to 13As shown, the circuit breaker further includes a terminal cover 800, which is fixedly connected to the circuit breaker body 10 and is located on a side close to the arc extinguishing system 200. The terminal cover 800 includes an upper terminal cover 810 and a lower terminal cover 820, which are fixedly connected by fasteners such as screws. The upper terminal cover 810 and the lower terminal cover 820 are respectively provided with a plurality of cavities 811 and 821. The number of the cavities 811 and the cavities 821 is equal to the number of poles of the circuit breaker. In this embodiment, the number of the cavities 811 and the cavities 821 is 2. Of course, in other embodiments, the number can be 3 or 4. A fixing plate 812 is provided on the upper terminal cover 810, one end of which protrudes and is fixedly connected to the circuit breaker body 10, and screw holes are provided on the fixing plate 812 to accommodate screws. A plurality of partitions 813 arranged in sequence are provided in the cavity 811, and a plurality of through holes are provided on the partitions 813. The partitions 813 are made of metal material. The arc cut by the arc extinguishing system 200 enters the cavity 811 of the upper terminal cover 810 from the arc extinguishing system 200, and passes through the through holes on the partitions 813 arranged in sequence for further cutting and cooling, and finally is discharged from the terminal cover 800 through the through holes 814 provided on the side of the upper terminal cover 810 away from the arc extinguishing system 200.

[0054] An I-shaped positioning post 815 is provided on the side wall of the cavity 811 of the upper terminal cover 810. Corresponding to the positioning post 815, an I-shaped positioning post 822 is provided on the side wall of the cavity 821 of the lower terminal cover 820. Through grooves corresponding to the positioning posts 815 and 822 are respectively provided on the housing 100 of the circuit breaker body 10. The cooperation of the positioning posts 815, 822 and the through grooves guides and fixes the assembly of the terminal cover 800, thereby tightly and firmly combining the upper terminal cover 810 and the lower terminal cover 820.

[0055] Please continue to refer to Figure 12 and Figure 13As shown, the cavity 821 of the lower terminal cover 820 is provided with an open slot extending from front to back to accommodate the conductive copper busbar 600. The lower portion of the open slot is an open structure that directly extends to the bottom of the lower terminal cover. This eliminates the need to remove the terminal cover 800 during installation or maintenance, significantly saving time and costs. The lower terminal cover 820 is provided with an insulating surface 823, which is located between the upper terminal cover 820 and the conductive copper busbar 600, thereby isolating the upper terminal cover 810 from the conductive copper busbar 600 and preventing the free gas within the upper terminal cover 810 from causing a breakdown hazard to the conductive copper busbar 600. Furthermore, an insulating baffle 824 is provided on the lower terminal cover 820, and the insulating baffle 824 is provided between the metal grid of the wiring terminal 610 and the upper terminal cover 820, thereby isolating the wiring terminal 610 and the metal grid of the upper terminal cover 820, preventing arc sputtering from causing breakdown of the wiring terminal, thereby ensuring the safety of the electrical appliance.

[0056] It should be noted that, in addition to being arranged on the lower terminal cover 820, the insulating surface 823 and the insulating baffle 824 can also be arranged on the upper terminal cover 820, or can be arranged on the upper terminal cover 810 and the lower terminal cover 820 respectively, as long as their functions can be achieved, and there is no restriction here.

[0057] The circuit breaker of this embodiment can eliminate arc ionization by providing a metal partition in the terminal cover, reduce the arc energy during disconnection, shorten the arcing distance, and prevent phase-to-phase or ground short circuits caused by arcing; by providing an insulating baffle and an insulating surface, the free gas in the terminal cover is isolated from the terminal and the conductive copper busbar, thereby avoiding the possible breakdown of the terminal by the free gas and ensuring the safety of the electrical appliance. The terminal cover is configured as an upper and lower split structure, and an open through groove is provided on the lower terminal cover to accommodate the wiring copper busbar. There is no need to install the wiring copper busbar in advance during installation, which facilitates wiring and is easy to disassemble during maintenance, greatly saving time and cost.

[0058] As used in this specification and claims, the terms "comprises" and "include" merely indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list; a method or apparatus may also include other steps or elements. The term "and / or" as used herein includes any combination of one or more of the associated listed items.

[0059] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Furthermore, terms such as "upper," "lower," "left," and "right" used in this disclosure are intended solely to describe the relative positions of the components of the disclosure as shown in the accompanying drawings.

[0060] It is further understood that in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar.

[0061] The above embodiment is intended only to illustrate the technical concepts and features of the present invention and is a preferred embodiment. Its purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. It is not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made based on the principles of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A circuit breaker comprising a housing, an arc extinguishing system, a static contact assembly, a moving contact assembly, an operating mechanism, a terminal, a conductive copper busbar, and a terminal cover, wherein the arc extinguishing system, the static contact assembly, the moving contact assembly, and the operating mechanism are arranged in the housing, and characterized in that: The terminal cover comprises an upper terminal cover and a lower terminal cover which are fixedly connected. A plurality of cavities are provided on the upper terminal cover and the lower terminal cover respectively. A partition is provided in the cavity of the upper terminal cover. The terminal cover also comprises an insulating baffle and an insulating surface. The insulating surface is arranged between the conductive copper busbar and the partition of the upper terminal cover, and the insulating baffle is arranged between the wiring terminal and the partition of the upper terminal cover; The circuit breaker further includes a static contact cover, which is a "B"-shaped structure and includes an arc-blocking portion, a horizontal portion, and a raised portion. The arc-blocking portion is higher than the height of the static contact assembly. The arc-blocking portion is a vertical structure, and the horizontal portion is provided between the arc-blocking portion and the raised portion. The static contact cover is provided with an open slot that is sleeved above the static contact assembly. The static contact assembly includes a connecting plate, a reverse bending portion and an arc-striking piece, wherein a static contact is provided on the reverse bending portion, and the arc-striking piece includes a connecting portion, a bending portion and an arc-guiding portion, wherein the connecting portion is fixedly provided below the reverse bending portion, the bending portion protrudes upward to be substantially flush with the static contact, and then bends downward to above the connecting plate, and the arc-guiding portion is substantially parallel to the connecting plate; One end of the connecting plate is provided with a raised first bending structure, the arc-blocking portion and the horizontal portion respectively cooperate with the connecting plate of the static contact assembly, the arc-blocking portion cooperates with the first bending structure of the connecting plate, and the horizontal portion cooperates with the straight portion between the first bending structure and the reverse bending portion on the connecting plate. An open groove cooperating with the first bending structure is provided on the arc-blocking portion, and an open groove cooperating with the straight portion of the connecting plate is provided at the bottom of the horizontal portion. The straight portion is provided in the open groove, and a space-avoiding groove is also provided on the horizontal portion to accommodate the arc-guiding portion of the arc-striking piece to pass through, so as to facilitate the installation of the arc-striking piece.

2. A circuit breaker according to claim 1, characterized in that: The insulating surface is arranged below the partition.

3. A circuit breaker according to claim 1 or 2, characterized in that: The insulating baffle and the insulating surface are arranged on the upper terminal cover or the lower terminal cover.

4. A circuit breaker according to claim 1, characterized in that: An "I"-shaped positioning column is provided on the upper terminal cover and the lower terminal cover respectively.

5. The circuit breaker according to claim 1, characterized in that: The lower terminal cover is provided with an open groove which passes through from front to back.

6. A circuit breaker according to claim 1, characterized in that: The static contact cover is sleeved on the outside of the static contact assembly, and the arc blocking portion is arranged between the arc extinguishing system and the wiring terminal.

7. The circuit breaker according to claim 1, characterized in that: A magnetizing portion is provided on the connecting portion of the arc striking piece. The magnetizing portion protrudes from the connecting portion and is flush with the static contact.

8. A circuit breaker according to claim 6, characterized in that: The arc extinguishing system is arranged above the arc guide portion.

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