Static contact assembly and circuit breaker

Abstract

The static contact assembly comprises a static contact plate and a static arc striking angle, one end of the static contact plate is provided with a contact part, the contact part is provided with a static contact, the other end of the static contact plate is provided with a wiring part, and the static contact plate between the contact part and the wiring part is provided with a matching area. The wiring part and the contact part are arranged at intervals in the first direction, one end of the static arc striking angle is provided with a static arc striking part, the static arc striking part penetrates through the matching area to be connected with the contact part, and the other end of the static arc striking angle extends on the side away from the contact part. According to the utility model, the static contact plate forms the matching area, the static arc striking part of the static arc striking angle passes through the matching area to be connected with the contact part, the matching area is matched with the arc extinguishing chamber of the circuit breaker, so that the arc striking and arc extinguishing effects can be improved, and the static arc striking angle is connected with the edge of the static contact, so that the root of an arc can be effectively and quickly transferred.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of low voltage apparatus, concretely relates to a static contact assembly and circuit breaker. BACKGROUND

[0002] The plastic shell circuit breaker is a kind of low voltage circuit protection device, it has overload, short circuit and under voltage protection etc., when circuit short circuit fault occurs, moving contact and static contact produce arc when separating, arc is extinguished under the action of magnetic field and gas field along arc guide angle into arc extinguishing chamber.

[0003] In the existing product, static contact assembly has the following defects: first, gap exists between arc guide angle and static contact point, the existence of this gap produces magnetic resistance, cannot quickly and effectively connect with arc root at static contact point, is not conducive to the rapid transfer of arc root;Second, static contact assembly is arranged along the end surface between arc entry end and exhaust end connected with arc extinguishing chamber, is not conducive to the arrangement of grid group in arc extinguishing chamber, and does not have magnetic blow effect;Third, static contact assembly is in U-shaped structure as a whole, and occupies more space in the interior;Fourth, static contact assembly uses more materials in general, and cost is high. SUMMARY

[0004] The utility model aims at overcoming at least one defect of prior art, and provides a static contact assembly and circuit breaker.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] The utility model provides a static contact assembly, including static contact plate and static arc guide angle, one end of static contact plate is equipped with contact part, static contact point is equipped in contact part, the other end of static contact plate is equipped with wiring part, static contact plate between contact part and wiring part is equipped with cooperation area, wiring part and contact part are spaced apart in the first direction, one end of static arc guide angle is equipped with static arc guide part, static arc guide part passes through cooperation area and is connected with contact part, the other end of static arc guide angle extends on the side away from contact part.

[0007] Preferably, the cooperation area is formed by the space enclosed by the contact part, the wiring part, and the static contact plate connected between the contact part and the wiring part.

[0008] Preferably, the contact part and the static arc guide part are arranged in a direction that forms an angle with the first direction, and the contact part on the side opposite to the static contact point is inclined relative to the middle part of the static arc guide angle, the middle part of the static contact plate is folded at least once to form at least one inclined section, the inclined section is spaced apart from the static arc guide part, and the current flowing through the inclined section is opposite to the current flowing through the static arc guide part.

[0009] Preferably, the static arc guiding corner is a straight plate parallel to the first direction, and the static arc guiding corner is folded to form the static arc guiding part.

[0010] Preferably, an opening groove for shrinking the arc root is arranged in the region between the two ends of the static arc guiding corner.

[0011] Preferably, the end of the static arc guiding corner away from the static arc guiding part is a static horn part, and the width of the static horn part is the smallest.

[0012] Preferably, the width of the static arc guiding part to the static horn part gradually decreases.

[0013] Preferably, the static horn part is provided with a convex, and the convex is located on the side of the static arc guiding corner away from the contact part.

[0014] Preferably, the static horn part is folded to extend to one side.

[0015] Preferably, the static contact plate is a straight plate, the middle part of the static contact plate is folded to form a horizontal section and an inclined section on the same plane, the end of the horizontal section away from the inclined section is folded to form a first transition section, and a connecting part is formed by extending the side edge of the first transition section in the first direction away from the inclined section; the end of the inclined section away from the horizontal section is folded to form a second transition section on the same plane, and a contact part is formed by folding the end of the second transition section, the contact part and the connecting part are spaced apart, and the middle part of the static contact plate connected between the contact part and the connecting part is arranged along one side of the space, so that the contact part, the connecting part, and the middle part of the static contact plate connected between the contact part and the connecting part form a matching area.

[0016] Preferably, the second transition section and the inclined section are perpendicular to each other.

[0017] The utility model further provides a circuit breaker, including the shell, at least a pair of wiring terminal is provided in the shell, the movable contact is provided in the shell, still be provided with the static contact subassembly as above in the shell, the static contact point of contact part and the movable contact point of movable contact are opposite and spaced, the connecting part is connected with adjacent one wiring terminal.

[0018] Further, the shell is further provided with an arc extinguishing chamber, the arc extinguishing chamber comprises two arc extinguishing cavities which are communicated with each other, the static contact plate is arranged along the outside of one of the arc extinguishing cavities, and the static arc guiding corner cooperates with the other arc extinguishing cavity.

[0019] Further, the two arc extinguishing cavities are divided into a first arc extinguishing cavity and a second arc extinguishing cavity, the first arc extinguishing cavity is arranged in the matching area along the second direction, the second arc extinguishing cavity is arranged along the first direction, the contact part and the moving contact are spaced apart in the second direction at the first arc entry port of the first arc extinguishing cavity, the wiring part is located at one end of the first arc extinguishing cavity away from the first arc entry port, the static contact plate connected between the wiring part and the contact part is arranged along the outer side wall of the first arc extinguishing cavity, and the plane where the static contact plate is located is parallel to the first direction and the second direction at the same time, the second arc entry port of the second arc extinguishing cavity is covered by the static arc guiding corner, and the second direction is perpendicular to the first direction.

[0020] Further, the outer side wall of the arc extinguishing cavity and the static contact plate are provided with an arc separation plate.

[0021] The static contact plate of the static contact head assembly and the circuit breaker forms a matching area, the static arc guiding part of the static arc guiding corner is connected with the contact part through the matching area, the matching area can improve the arc guiding and extinguishing effect by cooperating with the arc extinguishing chamber of the circuit breaker, and the edge of the static arc guiding corner and the static contact point are connected, so that the arc root of the electric arc can be quickly transferred.

[0022] In addition, the current direction of the contact part and the inclined section is opposite, and the principle of repulsion of opposite currents is used to generate a magnetic field that drives the movement of the electric arc.

[0023] In addition, the straight plate-shaped static arc guiding corner can prolong the arc guiding distance, and the static arc guiding corner extends along the direction parallel to the connecting line between the contact part and the wiring part, so that the overall occupied space is small.

[0024] In addition, the opening groove is arranged on the static arc guiding corner to converge the arc root, so that the current density at the arc root is increased, the electric force at the arc root is increased, the movement of the electric arc is accelerated, and the arc guiding and extinguishing effect is improved.

[0025] In addition, the static sharp corner part of the static arc guiding corner is provided with a convex or is bent to one side, the magnetic field strength at the static sharp corner part is high, and the convex and bending structure is beneficial to the movement of the electric arc.

[0026] In addition, when the static contact head assembly cooperates with the arc extinguishing chamber, the static contact plate and the static arc guiding corner cooperate with the two arc extinguishing cavities respectively, the static contact plate is arranged along the side surface of one arc extinguishing cavity, so that the matching area corresponds to the magnetic field generated by the cooperation of the arc extinguishing chamber, which is beneficial to the movement of the electric arc, the static arc guiding corner cooperates with the other arc extinguishing cavity, which is beneficial to guiding the electric arc, and also improves the utilization rate of the arc extinguishing grid in the other arc extinguishing cavity.

[0027] In addition, the static contact head assembly is also provided with an arc guiding plate, and the arc guiding plate and the static arc guiding corner cooperate with each other, which is beneficial to guiding the electric arc of the static contact head assembly into the arc extinguishing chamber. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1is a structural schematic diagram of a static contact assembly in the prior art;

[0029] Figure 2 is a structural schematic diagram of a static contact plate in the prior art;

[0030] Figure 3 is a matching schematic diagram of a static contact assembly and an arc extinguishing chamber in the prior art;

[0031] Figure 4 is a structural schematic diagram of a circuit breaker in the prior art;

[0032] Figure 5 is a matching schematic diagram of an arc extinguishing chamber and a static contact assembly of the first embodiment in the prior art;

[0033] Figure 6 is a structural schematic diagram of a contact system in the prior art (including a static contact assembly of the first embodiment);

[0034] Figure 7 is a structural schematic diagram of a static contact assembly of the first embodiment in the prior art;

[0035] Figure 8 is a structural schematic diagram of a static contact plate of the first embodiment in the prior art;

[0036] Figure 9 is a structural schematic diagram of a static arc striking corner of the first embodiment in the prior art Figure 1 ;

[0037] Figure 10 is Figure 9 a front view;

[0038] Figure 11 is a structural schematic diagram of a static arc striking corner of the first embodiment in the prior art Figure 2 ;

[0039] Figure 12 is Figure 11 a front view;

[0040] Reference signs:

[0041] 321-rotating shaft, 322-moving contact, 323-static contact assembly, 3230-static contact plate, 3231-contacting part, 3232-wiring part, 3233-static contact point, 3234-inclined section, 3235-horizontal section, 3236-first transition section, 3237-second transition section, 3238-matching area, 33-arc extinguishing chamber, 334-static arc striking corner, 3341-static arc striking part, 3342-static sharp corner part, 3343-open slot, 3344-bulge, 337-separating plate, 34-coupling plate. DETAILED DESCRIPTION

[0042] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the static contact assembly and circuit breaker of the present invention. The static contact assembly and circuit breaker of the present invention are not limited to the description of the following embodiments.

[0043] The circuit breaker includes a housing, in which an operating mechanism and at least one conductive unit are disposed. The housing is provided with an operating hole. The operating mechanism is rotatably assembled and connected to an operating member. The operating member extends from the operating hole to the outside of the housing for manually driving the operating mechanism. Each conductive unit includes a pair of spaced-apart terminals. A contact system and an arc extinguishing chamber are disposed between the pair of terminals. The contact system corresponds to the arc entry port of the arc extinguishing chamber 33. The arc generated by the disconnection of the contact system is introduced into the arc extinguishing cavity of the arc extinguishing chamber 33 by the arc extinguishing chamber 33 for extinguishing.

[0044] Typically, the contact system includes a movable contact assembly and a static contact assembly 323 that cooperate with each other. The operating mechanism is driven and connected to the movable contact assembly. The movable contact assembly includes a rotating shaft 321 that is rotatably assembled and a movable contact 322 connected to the rotating shaft 321. For the convenience of description, the connection direction between a pair of terminals is the first direction, and the two directions perpendicular to the first direction are the second direction and the third direction. Figure 4 For example, the first direction is the left-right direction, the second direction is the up-down direction, and the third direction is the direction perpendicular to the paper. The moving contact 322 and the static contact assembly 323 are spaced opposite to each other in the second direction and contact or separate at the arc entrance of the arc extinguishing chamber 33. Figures 1-3 As shown, the static contact assembly 323 generally includes a static contact plate 3230 and a static arc striking angle 334, wherein the static contact plate 3230 is a U-shaped structure as a whole, and the two ends of the static contact plate 3230 are respectively provided with a contact portion 3231 and a wiring portion 3232, wherein the contact portion 3231 and the wiring portion 3232 are respectively angled with the connected static contact plate 3230 area, the contact portion 3231 is provided with a static contact point 3233, the wiring portion 3232 is connected to a wiring terminal, the wiring portion 3232 and the contact portion 3231 are spaced opposite to each other in the first direction, and one end of the static arc striking angle 334 is connected to the contact portion 3231. 231 connection, the other end of the static arc-starting angle 334 extends in the recess between the contact portion 3231 and the wiring portion 3232. At this time, it can be considered that the static arc-starting angle 334 is arranged in the static contact plate 3230 in the second direction. When the arc extinguishing chamber 33 is matched with the static contact assembly 323, that is, the arc extinguishing chamber 33 and the static contact assembly 323 are arranged in the second direction, the static contact 3233 is located on the arc entrance side of the arc extinguishing chamber 33, one end of the arc extinguishing chamber 33 is arranged in the recess of the static contact plate 3230, and the static arc-starting angle 334 extends from the arc entrance to the arc extinguishing cavity of the arc extinguishing chamber 33.

[0045] The improvement of the application is that the static contact plate 3230 between the contact part 3231 and the wiring part 3232 is provided with a matching area 3238, so that the wiring part 3232 and the contact part 3231 are arranged in the first direction, one end of the static arc guiding angle 334 is provided with a static arc guiding part 3341, the static arc guiding part 3341 is connected with the contact part 3231 through the matching area 3238, and the other end of the static arc guiding angle 334 extends away from the contact part 3231.

[0046] Therefore, the static contact plate forms the matching area, the static arc guiding part 3341 of the static arc guiding angle 334 is connected with the contact part 3231 through the matching area 3238, the matching area 3238 can improve the arc guiding and extinguishing effect by cooperating with the arc extinguishing chamber of the circuit breaker, and the static arc guiding angle 334 is connected with the edge of the static contact point 3233, so that the arc root of the arc can be quickly transferred.

[0047] Specifically, the matching area 3238 is formed by the space surrounded by the contact part 3231, the wiring part 3232 and the static contact plate 3230 connected between the contact part 3231 and the wiring part 3232, when the arc enters the arc extinguishing chamber corresponding to the matching area 3238, the static contact plate 3230 can generate a magnetic field conducive to driving the arc to move, thereby facilitating the arc guiding and extinguishing.

[0048] Further, the contact part 3231 and the static arc guiding part 3341 are arranged in a direction at an angle with the first direction, so that the contact part 3231 on the side opposite to the static contact point 3233 is inclined relative to the middle part of the static arc guiding angle 334, the middle part of the static contact plate 3230 is at least bent once to form at least one inclined section 3234, the inclined section 3234 is spaced apart from the static arc guiding part 3341, so that the current flowing through the inclined section 3234 is opposite to the current flowing through the static arc guiding part 3341, according to the principle of repulsion of opposite currents, a magnetic field that can drive the arc to move is generated, thereby improving the arc guiding effect.

[0049] Preferably, the static arc guiding angle 334 is a straight plate parallel to the first direction, one end of the static arc guiding angle 334 is bent to form the static arc guiding part 3341, so that the straight plate shape of the static arc guiding angle 334 can lengthen the arc guiding distance, and the static arc guiding angle 334 extends along the direction parallel to the connecting line between the contact part 3231 and the wiring part 3232, so that the overall occupied space is small; further, the middle part of the static arc guiding angle 334 is provided with an open slot 3343 located between the two ends of the static arc guiding angle 334 for shrinking the arc root, and further, the other end of the static arc guiding angle 334 forms a static sharp angle part 3342, that is, the width of the end of the static arc guiding angle 334 away from the static arc guiding part 3341 is the smallest, and the width change is preferably gradually reduced, and the magnetic field strength of the static sharp angle part 3342 is strong, which is conducive to guiding the arc into the arc extinguishing chamber 33.

[0050] In combinationFigures 4-12 A specific embodiment of the stationary contact assembly 323 is provided.

[0051] like Figures 4-8 As shown, the static contact assembly 323 includes a static contact plate 3230 and a static arc striking angle 334, wherein the static contact plate 3230 is a straight plate arranged along the first direction, and the plane on which the static contact plate 3230 is located is parallel to the plane enclosed by the first and second directions. The middle portion of the static contact plate 3230 is deflected once on the same plane to form a horizontal section 3235 and an inclined section 3234, wherein the horizontal section 3235 is parallel to the first direction, and one end of the horizontal section 3235 away from the inclined section 3234 is bent to form a first transition section 3236. In this embodiment, the first transition section 3236 extends along a third direction that is perpendicular to both the first and second directions, and a side edge of the first transition section 3236 extends along the first direction away from the inclined section 3234 to form a wiring portion 3232. In the figure, the wiring portion 3232 is formed by extending from the upper edge of the first transition section 3236. The wiring portion 3232 is provided with a wiring hole for connecting to a wiring terminal.

[0052] One end of the inclined section 3234 away from the horizontal section 3235 deviates from the first direction, and one end of the inclined section 3234 away from the horizontal section 3235 is reversely deflected to form a second transition section 3237. The second transition section 3237 and the inclined section 3234 form an angle on the same plane. Figure 8 In the figure, the second transition section 3237 and the inclined section 3234 are perpendicular to each other on the same plane, and the contact portion 3231 is formed by bending and extending the end of the second transition section 3237. In the figure, the plane where the contact portion 3231 is located is perpendicular to the plane where the second transition section 3237 is located, and an angle is formed between the plane where the contact portion 3231 is located and the first direction. A static contact point 3233 is provided on the side of the contact portion 3231 facing the wiring portion 3232. In this embodiment, the contact portion 3231 and the wiring portion 3232 are spaced apart and opposite to each other on the same side of the static contact plate 3230.

[0053] In addition, a gap is left between the contact portion 3231 and the wiring portion 3232, and the middle part of the static contact plate 3230 connected between the contact portion 3231 and the wiring portion 3232 is arranged along the same side of the gap, so that the contact portion 3231, the wiring portion 3232 and the middle part of the static contact plate 3230 connected between the contact portion 3231 and the wiring portion 3232 form a matching area 3238. When the static contact assembly is set in the circuit breaker, the matching area 3238 can be used to accommodate the arc extinguishing chamber.

[0054] like Figures 4-7As shown in Figures 9-12, the static arc striking angle 334 is a straight plate parallel to the first direction. The straight plate structure can extend the arc striking distance, and the static arc striking angle 334 extends along the direction parallel to the connection line between the contact portion 3231 and the wiring portion 3232. The overall space occupied is small. Preferably, the static arc striking angle 334 includes a plate-shaped body with different widths at both ends, and the width of the plate-shaped body gradually changes. The plate-shaped body is arranged along the first direction. Figures 9-12 In the embodiment, the plane where the plate-shaped body is located is parallel to the plane formed by the second direction and the third direction, and one end of the plate-shaped body with a larger width is folded back to form a static arc-starting portion 3341, and the extension direction of the static arc-starting portion 3341 is parallel to the plane where the contact portion 3231 is located, the static arc-starting portion 3341 is connected to the contact portion 3231 and the edge of the static arc-starting portion 3341 is connected to the edge of the static contact 3233, and there is no gap between the static arc-starting portion 3341 and the static contact 3233, so that the arc root at the static contact 3233 is quickly and effectively transferred to the static arc-starting corner 334, and one end of the plate-shaped body with a smaller width serves as a static sharp corner portion 3342, and the plate-shaped body connected between the static sharp corner portion 3342 and the static arc-starting portion 3341 is provided with a strip-shaped open groove 3343, and the open groove 3343 is used to shrink the arc root to increase the transfer speed of the arc root.

[0055] Further, such as Figure 9 、 10 As shown, a bulge 3344 is provided in the static arc-starting angle 334 area between the static sharp corner portion 3342 and one end of the opening slot 3343, and the bulge 3344 is located on the side of the static arc-starting angle 334 facing away from the contact portion 3231. The sharp shape of the static sharp corner portion 3342 is combined with the bulge 3344, so that the magnetic field intensity corresponding to the area is large and the magnetic flux lines are dense, which is conducive to guiding the arc.

[0056] Or, as Figure 11 、 12 As shown, the static sharp corner portion 3342 is bent and extended to one side. In the figure, the static sharp corner portion 3342 is bent and extended along the second direction, so that the end of the static sharp corner portion 3342 can be spaced opposite to the grid group in the arc extinguishing chamber 33, which is also conducive to arc striking.

[0057] When the static contact assembly 323 of this embodiment is applied to a circuit breaker, such as Figure 4 、 5As shown, the circuit breaker comprises a housing, at least one conductive unit is arranged in the housing, the conductive unit comprises a pair of connecting terminals, a contact system and an arc extinguishing chamber 33 are arranged between the pair of connecting terminals, wherein the contact system comprises a moving contact assembly and the static contact assembly 323 of the above embodiment, the moving contact assembly can adopt the prior art, the moving contact assembly comprises a rotating shaft 321 and a moving contact 322 connected to the rotating shaft 321, the moving contact 322 is provided with a moving contact point, the moving contact point is spaced apart from the static contact point 3233 of the contact part 3231, the moving contact assembly is electrically connected to one of the adjacent connecting terminals through the connecting plate 34, and the connecting part 3232 is electrically connected to the other adjacent connecting terminal; the contact system is arranged in the arc inlet of the arc extinguishing chamber 33, and the moving arc striking angle matched with the moving contact 322 can adopt the prior art.

[0058] In the embodiment, the arc extinguishing chamber 33 preferably comprises two arc extinguishing cavities in communication with each other, the two arc extinguishing cavities are preferably arranged at an angle, Figure 1 In the embodiment, the two arc extinguishing cavities are perpendicular to each other, the arc extinguishing cavity arranged in the second direction is the first arc extinguishing cavity, and the arc extinguishing cavity arranged in the first direction is the second arc extinguishing cavity, the side surface (the length direction of the first arc extinguishing cavity) of the first arc extinguishing cavity is provided with a first arc inlet, the first arc extinguishing cavity is located in the matching area 3238 of the static contact assembly, and the static contact assembly and the moving contact 322 are arranged at the first arc inlet, that is, in the second direction, the contact part 3231 of the static contact assembly is spaced apart from the moving contact 322 at the first arc inlet, the connecting part 3232 is located at one end of the first arc extinguishing cavity away from the first arc inlet, the static contact plate 3230 connected between the connecting part 3232 and the contact part 3231 is arranged along the outer side wall of the first arc extinguishing cavity, and the plane where the static contact plate 3230 connected between the connecting part 3232 and the contact part 3231 is located is parallel to the first direction and the second direction at the same time, and the second arc inlet of the second arc extinguishing cavity can be covered by the static arc striking angle 334, as shown in the figure, wherein the static contact plate 3230 is arranged along the outer side of one of the arc extinguishing cavities (the first arc extinguishing cavity), specifically, the horizontal section 3235 and the inclined section 3234 are arranged along the outer side of the arc extinguishing cavity, that is, Figure 5 , Figure 7 , 8In the embodiment, the matching area 3238 of the static contact plate 3230 is used to provide an assembly position for the arc extinguishing chamber (the first arc extinguishing chamber), and the static contact plate 3230 connected between the wiring part 3232 and the contact part 3231 is arranged outside the side plate in the first arc extinguishing chamber for supporting the grid group, that is, the horizontal section 3235 and the inclined section 3234 are arranged along the side plate outside wall parallel to the first arc extinguishing chamber, compared with the prior art that the static contact plate 3230 is arranged along one end between two side plates in the first arc extinguishing chamber, the static contact plate 3230 of the embodiment has the function of generating a magnetic field, that is, when the current flows through the horizontal section 3235 and the inclined section 3234, a magnetic field can be generated, thereby matching to provide driving force for the arc in the arc extinguishing chamber, and it should be noted that an arc separation plate 337 is arranged between the outside wall of the arc extinguishing chamber and the static contact plate 3230; the static arc guiding horn 334 cooperates with another arc extinguishing chamber, and in the figure, the static arc guiding horn 334 is arranged outside the opening of the other arc extinguishing chamber (the second arc extinguishing chamber), and it can also be understood that the static arc guiding horn 334 covers one side opening of the other arc extinguishing chamber, and the opening of the second arc extinguishing chamber can be considered as a second arc inlet, thereby guiding the arc into the arc extinguishing chamber.

[0059] It should be noted that in the description of the utility model, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings or the orientation or positional relationship commonly used in use, and are only for the convenience of description, and do not indicate that the device or element referred to must have a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating relative importance.

[0060] The above is a further detailed description of the utility model in combination with specific preferred embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the utility model belongs, without departing from the concept of the utility model, a number of simple deductions or substitutions can be made, and all of them should be regarded as falling within the protection scope of the utility model.

Claims

1. A static contact assembly, comprising a static contact plate (3230) and a static arc striking angle (334), wherein one end of the static contact plate (3230) is provided with a contact portion (3231), the contact portion (3231) is provided with a static contact point (3233), and the other end of the static contact plate (3230) is provided with a wiring portion (3232), characterized in that: A matching area (3238) is provided on the static contact plate (3230) between the contact portion (3231) and the wiring portion (3232), so that the wiring portion (3232) and the contact portion (3231) are spaced apart in a first direction, and a static arc-starting portion (3341) is provided at one end of the static arc-starting angle (334), and the static arc-starting portion (3341) passes through the matching area (3238) and is connected to the contact portion (3231), and the other end of the static arc-starting angle (334) extends on a side away from the contact portion (3231).

2. The static contact assembly according to claim 1, characterized in that: The matching area (3238) is a space formed by the contact portion (3231), the wiring portion (3232), and the static contact plate (3230) connected between the contact portion (3231) and the wiring portion (3232).

3. The static contact assembly according to claim 1, characterized in that: The contact portion (3231) and the static arc-striking portion (3341) are arranged along a direction forming an angle with the first direction, so that the contact portion (3231) on the side facing away from the static contact point (3233) is inclined relative to the middle of the static arc-striking angle (334), and the middle of the static contact plate (3230) is deflected at least once so that the static contact plate (3230) forms at least one inclined section (3234), and the inclined section (3234) is spaced relative to the static arc-striking portion (3341), so that the current flowing through the inclined section (3234) is opposite to the current flowing through the static arc-striking portion (3341).

4. The static contact assembly according to claim 1, characterized in that: The static arc striking angle (334) is a straight plate parallel to the first direction, and the static arc striking angle (334) is folded back to form a static arc striking portion (3341).

5. The static contact assembly according to claim 4, characterized in that: An open slot (3343) for shrinking the arc root is provided in a region connected between the two ends of the static arc striking angle (334).

6. The static contact assembly according to claim 4, characterized in that: One end of the static arc striking angle (334) away from the static arc striking portion (3341) is a static sharp corner portion (3342), and the width of the static sharp corner portion (3342) is the smallest.

7. The static contact assembly according to claim 6, characterized in that: The width from the static arc-starting portion (3341) to the static sharp corner portion (3342) gradually decreases.

8. The static contact assembly according to claim 6, characterized in that: The static sharp corner portion (3342) is provided with a convex hull (3344), and the convex hull (3344) is located on the side of the static arc striking corner (334) facing away from the contact portion (3231).

9. The static contact assembly according to claim 6, characterized in that: The static sharp corner portion (3342) bends and extends to one side.

10. The static contact assembly according to claim 1, characterized in that: The static touch plate (3230) is in the shape of a straight plate. The middle portion of the static touch plate (3230) is bent on the same plane to form a horizontal section (3235) and an inclined section (3234). One end of the horizontal section (3235) away from the inclined section (3234) is bent to form a first transition section (3236). A side edge of the first transition section (3236) extends along a first direction away from the inclined section (3234) to form a connecting portion (3232). One end of the inclined section (3234) away from the horizontal section (3235) is bent on the same plane to form a second transition section (3236). The transition section (3237) is formed by bending the end of the second transition section (3237) to form a contact portion (3231), a gap is left between the contact portion (3231) and the wiring portion (3232), and the middle portion of the static touch plate (3230) connected between the contact portion (3231) and the wiring portion (3232) is arranged along one side of the gap, so that the contact portion (3231), the wiring portion (3232) and the middle portion of the static touch plate (3230) connected between the contact portion (3231) and the wiring portion (3232) form a matching area (3238).

11. The static contact assembly according to claim 10, characterized in that: The second transition section (3237) and the inclined section (3234) are perpendicular to each other.

12. A circuit breaker comprising a housing, at least one pair of connection terminals being provided in the housing, and a moving contact (322) being provided in the housing, characterized in that: The housing is further provided with a static contact assembly (323) as described in any one of claims 1 to 11, the static contact (3233) of the contact portion (3231) is spaced apart from the moving contact (322) of the moving contact, and the wiring portion (3232) is connected to an adjacent wiring terminal.

13. The circuit breaker according to claim 12, wherein: An arc extinguishing chamber (33) is further provided in the housing. The arc extinguishing chamber (33) includes two arc extinguishing chambers that are connected to each other. The static contact plate (3230) is provided along the outside of one of the arc extinguishing chambers, and the static arc striking angle (334) cooperates with the other arc extinguishing chamber.

14. The circuit breaker according to claim 13, wherein: The two arc extinguishing chambers are divided into a first arc extinguishing chamber and a second arc extinguishing chamber, the first arc extinguishing chamber is arranged in the matching area (3238) along the second direction, and the second arc extinguishing chamber is arranged along the first direction, the contact portion (3231) and the moving contact (322) are spaced apart and opposite to each other in the second direction at the first arc entrance of the first arc extinguishing chamber, the wiring portion (3232) is located at one end of the first arc extinguishing chamber away from the first arc entrance, the static contact plate (3230) connected between the wiring portion (3232) and the contact portion (3231) is arranged along the outer wall of the first arc extinguishing chamber, and the plane where the static contact plate (3230) connected between the wiring portion (3232) and the contact portion (3231) is located is parallel to the first direction and the second direction at the same time, the second arc entrance of the second arc extinguishing chamber is covered by the static arc striking angle (334), and the second direction is perpendicular to the first direction.

15. The circuit breaker according to claim 14, wherein: An arc isolation plate (337) is provided between the outer side wall of the arc extinguishing chamber and the static contact plate (3230).

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