Arc extinguishing structure and low-voltage electric appliance

Abstract

The utility model relates to the technical field of low-voltage electric appliances, and particularly discloses an arc extinguishing structure and a low-voltage electric appliance. The arc extinguishing structure provided by the utility model comprises a static contact assembly and an arc extinguishing chamber, the static contact assembly comprises a static contact, the static contact is provided with a static contact, the arc extinguishing chamber comprises an arc extinguishing member and a plurality of grid sheets arranged at intervals, the other end of the arc extinguishing member extends along a first direction, and the first direction is the arrangement direction of the plurality of grid sheets. The other end of the arc extinguishing member is obliquely arranged from the static contact or one of the grid sheets, and the distance between the arc extinguishing member at the inclined part and the end part of the first end of the grid sheet is gradually reduced, so that the arc can enter the grid sheet more quickly and more easily, the arcing time during breaking of a low-voltage electric appliance is shortened, the arc breaking capacity of the contact is improved, and the service life of the contact is prolonged. Temperature rise in the contact is reduced, and the service life of a low-voltage electric appliance is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an arc extinguishing structure and a low-voltage electrical appliance. Background Art

[0002] Air arc under atmospheric pressure is the most common arc form in low-voltage switchgear. Air arc under atmospheric pressure will occur when closing and opening most switchgear such as relays, contactors, load switches and circuit breakers that use air as arc extinguishing medium. The most common arc extinguishing method is to extinguish the arc through the arc extinguishing grid. During the opening and closing process of low-voltage switchgear, the arc begins to move after experiencing the arc stagnation process. The arc is transferred from the contact to the arc runner and enters the arc extinguishing grid to extinguish the arc.

[0003] The existing common grid arc extinguishing chamber has a plurality of grids and arc extinguishing parts installed therein. Under the conditions of high voltage and high current, the arrangement of the grids and arc extinguishing parts in the prior art makes the arc burning time of the low-voltage switch electrical appliance long, and the ability of the contacts to break the arc is relatively poor, resulting in an increase in the temperature inside the contacts, thereby shortening the service life of the low-voltage switch electrical appliance. Utility Model Content

[0004] The utility model aims to provide an arc extinguishing structure and a low-voltage electrical appliance, which shorten the arc burning time when the low-voltage electrical appliance is disconnected, improve the arc disconnecting capability of the contact, and extend the service life of the low-voltage electrical appliance.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] On the one hand, an arc extinguishing structure is provided, comprising:

[0007] A stationary contact assembly comprises a stationary contact, wherein a stationary contact point is arranged on the stationary contact;

[0008] An arc extinguishing chamber is arranged corresponding to the static contact assembly, and the arc extinguishing chamber includes an arc extinguishing piece and a plurality of grids arranged at intervals. One end of the arc extinguishing piece is connected to the static contact assembly, and the other end of the arc extinguishing piece extends from the static contact along the first direction in which the plurality of grids are arranged, and is inclined from the static contact or from one of the grids, and the distance between the arc extinguishing piece at the inclined portion and the first end of the grid gradually decreases.

[0009] As an optional technical solution of the above arc extinguishing structure, the first end portions of a plurality of the grid plates are arranged flush with each other.

[0010] As an optional technical solution of the above arc extinguishing structure, along the first direction, a plurality of the grid sheets are divided into a first group of grid sheets and a second group of grid sheets which are arranged in sequence, the first ends of the grid sheets of the first group are arranged flush, and the first ends of the grid sheets of the second group are gradually approaching the arc extinguishing member in sequence along the first direction; or

[0011] The first ends of the plurality of grid pieces gradually approach the arc extinguishing member in sequence along the first direction.

[0012] As an optional technical solution of the above arc extinguishing structure, the second end of at least one of the grid plates is bent, and the bending direction is away from the static contact.

[0013] As an optional technical solution of the above arc extinguishing structure, the bending angle of the second end of the grid piece is set to 1° to 80°.

[0014] As an optional technical solution of the above arc extinguishing structure, the static contact assembly further includes a connecting plate and a pad, the connecting plate and the pad are arranged in a superimposed manner along the second direction, the connecting plate is arranged on a side of the pad facing the grid, and the static contact is connected to the connecting plate;

[0015] One end of the arc extinguishing member is connected to the static contact or one end of the arc extinguishing member is connected to the connecting plate.

[0016] As an optional technical solution of the above arc extinguishing structure, the static contact assembly further includes a connecting plate and a pad, the connecting plate and the pad are arranged in a superimposed manner along the second direction, the connecting plate is arranged on a side of the pad away from the grid, and the static contact is connected to the pad;

[0017] One end of the arc extinguishing member is connected to the static contact or one end of the arc extinguishing member is connected to the backing plate.

[0018] As an optional technical solution to the above-mentioned arc extinguishing structure, the arc extinguishing member includes a U-shaped first arc extinguishing plate and a second arc extinguishing plate connected to one end of the first arc extinguishing plate, the other end of the first arc extinguishing plate is connected to the static contact assembly, the second arc extinguishing plate extends along a first direction, and the static contact is provided with one end of the static contact point which passes through the two side walls of the first arc extinguishing plate in sequence along a second direction toward the grid, and the second arc extinguishing plate is inclined from the static contact point or from one of the grid sheets.

[0019] As an optional technical solution of the above-mentioned arc extinguishing structure, the arc extinguishing structure also includes a moving contact assembly, the moving contact assembly includes a moving contact, each of the moving contacts is respectively provided with a moving contact point at both ends, the moving contact assembly is correspondingly provided with two static contact assemblies, each of the moving contacts is respectively provided with a short arc piece, the short arc piece is placed on the side of the moving contact away from the moving contact point, and the short arc piece is placed between the grids of the two arc extinguishing chambers.

[0020] On the other hand, a low-voltage electrical appliance is provided, comprising the arc extinguishing structure described in any one of the above.

[0021] Beneficial effects of the utility model:

[0022] The utility model provides an arc extinguishing structure, in which the other end of the arc extinguishing member extends along a first direction, the first direction being the direction in which a plurality of grid sheets are arranged, the other end of the arc extinguishing member is inclined starting from a static contact or one of the grid sheets, and the spacing between the arc extinguishing member of the inclined portion and the first end of the grid sheet gradually decreases, so that the arc can enter the grid sheet more quickly and easily, shortening the arc burning time when the low-voltage electrical appliance is disconnected, improving the ability of the contact to disconnect the arc, reducing the temperature rise inside the contact, and extending the service life of the low-voltage electrical appliance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an axonometric diagram of the first structure of the arc extinguishing structure provided by the embodiment of the utility model;

[0024] Figure 2 This is a front view of a first type of arc extinguishing structure provided by an embodiment of the utility model;

[0025] Figure 3 It is a structural schematic diagram of the arc extinguishing member provided in an embodiment of the utility model;

[0026] Figure 4 This is an axonometric diagram of the second structure of the arc extinguishing structure provided by the embodiment of the utility model;

[0027] Figure 5 This is a front view of a second structure of the arc extinguishing structure provided by an embodiment of the utility model;

[0028] Figure 6 This is a front view of a third type of arc extinguishing structure provided by an embodiment of the utility model;

[0029] Figure 7 This is a front view of a fourth structure of the arc extinguishing structure provided by an embodiment of the utility model;

[0030] Figure 8 It is a front view of the fifth structure of the arc extinguishing structure provided in the embodiment of the utility model.

[0031] In the figure:

[0032] 1. Static contact assembly; 2. Arc extinguishing chamber; 3. Moving contact assembly; 4. Short arc piece; 5. Screw-on piece;

[0033] 11. Static contact; 12. Connecting plate; 13. Backing plate; 14. Static contact point;

[0034] 21. arc extinguishing member; 211. first arc extinguishing plate; 212. second arc extinguishing plate; 213. mounting hole; 22. grid;

[0035] 31. Moving contact; 32. Moving contact point;

[0036] a, first direction; b, second direction; c, third direction. DETAILED DESCRIPTION

[0037] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] like Figure 1As shown, this embodiment provides an arc extinguishing structure, which includes a static contact assembly 1, a moving contact assembly 3 and an arc extinguishing chamber 2.

[0041] Each static contact assembly 1 is respectively provided with an arc extinguishing chamber 2, and the static contact assembly 1 includes a static contact 11. The moving contact assembly 3 includes a moving contact 31, and each moving contact 31 is respectively provided with a moving contact 32 at both ends. The moving contact assembly 3 is correspondingly provided with two static contact assemblies 1, and each static contact assembly 1 is respectively provided with a static contact 11 corresponding to the moving contact 32. Exemplarily, there are three moving contacts 31, and each moving contact 31 is respectively provided with a moving contact 32 at both ends. Each static contact assembly 1 includes three static contacts 11, and the three static contacts 11 are respectively provided with the moving contacts 32 at one end of the three moving contacts 31.

[0042] The stationary contact 11 is provided with a stationary contact 14, which is used to attract or disconnect with the moving contact 32 along the second direction b. The arc extinguishing chamber 2 includes a plurality of grid pieces 22, and the length of each grid piece 22 extends along the third direction c in which the stationary contacts 11 are arranged, so as to ensure that the arc generated when each stationary contact 11 is disconnected from the moving contact 31 can enter the arc extinguishing chamber 2, and the plurality of grid pieces 22 are arranged at intervals and arranged along the first direction a.

[0043] like Figure 2 As shown, the arc extinguishing chamber 2 also includes an arc extinguishing member 21, one end of which is connected to the static contact assembly 1, and the other end of the arc extinguishing member 21 extends from the static contact 14 along the first direction a, and is inclined from the static contact 14 or from one of the grids 22. The distance between the arc extinguishing member 21 of the inclined portion and the first end of the grid 22 gradually decreases, so that the arc can enter the grid 22 more quickly and easily, shortening the arcing time when the low-voltage electrical appliance is disconnected, improving the ability of the contact to disconnect the arc, reducing the temperature rise inside the contact, and extending the service life of the low-voltage electrical appliance.

[0044] It needs to be further explained that the other end of the arc extinguishing member 21 can be tilted from the position of the static contact 14 and extend toward the last grid piece 22, and the initial tilt height of the other end of the arc extinguishing member 21 is not higher than the surface of the static contact 14. Alternatively, the other end of the arc extinguishing member 21 can be tilted from the first grid piece 22 close to the static contact 11 and extend toward the last grid piece 22. Alternatively, the other end of the arc extinguishing member 21 can be tilted from a grid piece 22 in the middle and extend toward the last grid piece 22.

[0045] The stationary contact assembly 1 further includes a connecting plate 12 and a backing plate 13, which are stacked along the second direction b. With the connecting plate 12 as a reference surface, the angle α between the inclined portion of the arc extinguishing member 21 and the connecting plate 12 is set to 1° to 60°, which can be set according to the arc extinguishing capacity required by the low-voltage electrical appliance, and is not specifically limited here.

[0046] like Figure 2 and Figure 3 As shown, the arc extinguishing member 21 includes a U-shaped first arc extinguishing plate 211 and a second arc extinguishing plate 212 connected to one end of the first arc extinguishing plate 211, the other end of the first arc extinguishing plate 211 is fixed to the static contact assembly 1, and the second arc extinguishing plate 212 extends along the first direction a. The second arc extinguishing plate 212 is inclined from the static contact 14 or from one of the grids 22, and the spacing between the second arc extinguishing plate 212 and the first end of the grid 22 gradually decreases, and the second arc extinguishing plate 212 extends toward the last grid 22. The position of the second arc extinguishing plate 212 is set according to the arc extinguishing capacity required by the low-voltage electrical appliance. In this embodiment, the arc extinguishing member 21 is an integrated structural member, so the second arc extinguishing plate 212 is inclined relative to one end of the first arc extinguishing plate 211, that is, the second arc extinguishing plate 212 can be formed by bending during processing.

[0047] The end of the second arc-extinguishing plate 212 away from the first arc-extinguishing plate 211 is bent toward one side of the grid plate 22, and the bent portion is placed outside the last grid plate 22 and parallel to the grid plates 22 to ensure that the generated arc can be effectively led between the grid plates 22.

[0048] Combination Figure 3 and Figure 4 As shown, based on the structure of the arc extinguishing member 21, one end of the static contact 11 provided with the static contact 14 passes through the two side walls of the first arc extinguishing plate 211 in sequence along the second direction b toward the grid 22, and the static contact 14 is arranged opposite to the moving contact 32. The position where one end of the second arc extinguishing plate 212 is connected to the first arc extinguishing plate 211 is close to the static contact 14.

[0049] In some embodiments, Figure 5 As shown, the connecting plate 12 is arranged on the side of the pad 13 facing the grid 22, the stationary contact 11 is connected to the connecting plate 12, and the stationary contact 11, the connecting plate 12 and the pad 13 are mutually conductive. The connecting plate 12 is used to be conductively connected to the wiring terminal of the low-voltage electrical appliance. In some other embodiments, such as Figure 6 As shown, the connecting plate 12 is arranged on the side of the pad 13 away from the grid 22, and the static contact 11 is connected to the pad 13. In the two embodiments, wiring at different positions can be satisfied. The purpose of setting the pad 13 is to reduce the current density, evenly disperse the current, increase the thermal conductivity, and thus reduce the temperature rise of the static contact assembly 1. The material of the pad 13 and the connecting plate 12 can be the same or different, and can be set according to the requirements of thermal conductivity. In addition, the material of the pad 13 and the connecting plate 12 can be copper or aluminum, etc., which is not specifically limited here.

[0050] In some embodiments, Figure 6As shown, one end of the arc extinguishing member 21 may be connected to the static contact 11, specifically, the other end of the first arc extinguishing plate 211 of the arc extinguishing member 21 is connected to the static contact 11. In other embodiments, such as Figure 5 As shown, the connecting plate 12 is placed on the side of the pad 13 close to the grid 22, and one end of the arc extinguishing member 21 is connected to the connecting plate 12, specifically, the other end of the first arc extinguishing plate 211 is connected to the connecting plate 12. In other embodiments, the connecting plate 12 is placed on the side of the pad 13 away from the grid 22, and one end of the arc extinguishing member 21 is connected to the pad 13, specifically, the other end of the first arc extinguishing plate 211 is connected to the pad 13. Based on the above different embodiments, the connection positions of the arc extinguishing member 21 and the static contact assembly 1 are different, which can meet the different position requirements of the connecting plate 12, and thus can achieve wiring at different positions.

[0051] Reference Figure 3 and Figure 5 As shown, the overall arc extinguishing member 21 has a U-shaped structure, and mounting holes 213 are respectively opened on the two opposite side walls of the arc extinguishing member 21 of the U-shaped structure. When the arc extinguishing member 21 is connected to the static contact 11, two mounting holes 213 are sequentially penetrated through the screw connection member 5 to be screwed to the static contact 11, and in the process of fixing the arc extinguishing member 21, the angle of the inclined part of the arc extinguishing member 21 is ensured to remain unchanged. Figure 3 and Figure 6 As shown, when the arc extinguishing member 21 is connected to the connecting plate 12 or the backing plate 13 , a mounting hole 213 is penetrated through the screw connection member 5 , and the static contact 11 and another mounting hole 213 are screwed to the connecting plate 12 or the backing plate 13 .

[0052] like Figure 6 As shown, the grid pieces 22 are arranged in intervals along the first direction a. In some embodiments, based on the gradually decreasing distance between the inclined portion of the arc extinguishing member 21 and the first end of the grid piece 22, the arcing time when the low-voltage electrical appliance is disconnected can be shortened, and the arc breaking ability of the contact can be improved. Under the premise, the first ends of several grid pieces 22 are arranged flush.

[0053] In other embodiments, Figure 7 As shown, along the first direction a in which the plurality of grid pieces 22 are arranged, the plurality of grid pieces 22 are divided into a first group of grid pieces 22 and a second group of grid pieces 22 which are arranged in sequence, the first ends of the first group of grid pieces 22 are arranged flush, and the first ends of the second group of grid pieces 22 are gradually approached to the arc extinguishing member 21 in sequence along the first direction a, so as to gradually reduce the distance between the grid pieces 22 and the arc extinguishing member 21, thereby improving the arc extinguishing ability of the arc extinguishing structure. In the second group of grid pieces 22, the difference in the size of each grid piece 22 relative to the previous grid piece 22 close to the arc extinguishing member 21 is L, and the value range of L is 0.1 mm to 10 mm.

[0054] The number of the first group of grid pieces 22 and the second group of grid pieces 22 is not limited, and is set according to the arc extinguishing capability requirements of the low-voltage electrical appliance. The arc extinguishing member 21 of the inclined portion can use one of the grid pieces 22 in the first group of grid pieces 22 as the tilting starting point, or one of the grid pieces 22 in the second group of grid pieces 22 as the tilting starting point, and is set according to the arc extinguishing capability requirements of the low-voltage electrical appliance, and is not specifically limited here.

[0055] In other embodiments, along the first direction a in which the plurality of grid pieces 22 are arranged, the first ends of the plurality of grid pieces 22 gradually approach the arc extinguishing member 21 in sequence along the first direction a, so as to gradually reduce the distance between the grid pieces 22 and the arc extinguishing member 21, thereby improving the arc extinguishing ability of the arc extinguishing structure. At the same time, the arc extinguishing member 21 of the inclined portion can use one of the grid pieces 22 as the starting point of the inclination, and is set according to the arc extinguishing ability requirements of the low-voltage electrical appliance, which is not specifically limited here. The difference in the size of each grid piece 22 relative to the previous grid piece 22 close to the arc extinguishing member 21 is L, and the value range of L is 0.1mm to 10mm.

[0056] In some embodiments, Figure 8 As shown, the second end of at least one grid 22 is bent, and the bending direction is away from the static contact 11. In a high voltage and high current environment, the second end of the grid 22 is bent, which is conducive to the exhaust of the arc extinguishing chamber 2, and the exhausted gas is guided by the bent part without directly impacting the plastic parts at the corresponding position above the grid 22, thereby protecting the plastic parts and extending the service life of the low-voltage electrical appliance. Optionally, the second ends of several grids 22 in each arc extinguishing chamber 2 are bent. Or a part of the several grids 22 in each arc extinguishing chamber 2 is bent, but there is no fixed arrangement rule between the bent grids 22 and the non-bent grids 22. Or the grids 22 are bent in a targeted manner, the grids 22 facing the plastic parts are bent, and the grids 22 not facing the plastic parts are not bent.

[0057] Optionally, the bending angle of the second end of the grid plate 22 is set to 1° to 80°, which is not specifically limited here.

[0058] In some embodiments, continue to refer to Figure 8 As shown, the arc extinguishing structure also includes a short arc piece 4, which is arranged corresponding to the moving contact 31, that is, each moving contact 31 is respectively provided with a short arc piece 4. The short arc piece 4 is arranged on the side of the moving contact 31 away from the moving contact point 32, and the short arc piece 4 is arranged between the grid pieces 22 of the two arc extinguishing chambers 2. In the environment of high voltage and high current, when the low voltage electrical appliance is disconnected, the short arc piece 4 can reduce the burning of the moving contact 31.

[0059] The short arc member 4 is a plate-shaped structure. Both ends of the short arc member 4 are bent toward the moving contact 31 to form a U-shaped structure. The side wall of the U-shaped structure is arranged parallel to the grid sheet 22 .

[0060] This embodiment also provides a low-voltage electrical appliance, which includes the above-mentioned arc extinguishing structure.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Arc extinguishing structure, characterized in that: include: A stationary contact assembly (1) comprises a stationary contact (11), wherein the stationary contact (11) is provided with a stationary contact point (14); An arc extinguishing chamber (2) is arranged corresponding to the static contact assembly (1), the arc extinguishing chamber (2) comprising an arc extinguishing member (21) and a plurality of grid plates (22) arranged at intervals, one end of the arc extinguishing member (21) is connected to the static contact assembly (1), the other end of the arc extinguishing member (21) extends from the static contact point (14) along a first direction (a) in which the plurality of grid plates (22) are arranged, and is inclined from the static contact point (14) or from one of the grid plates (22), and the distance between the arc extinguishing member (21) at the inclined portion and the first end of the grid plate (22) gradually decreases.

2. The arc extinguishing structure according to claim 1, characterized in that: The first ends of the plurality of grid plates (22) are arranged flush with each other.

3. The arc extinguishing structure according to claim 1, characterized in that: Along a first direction (a), a plurality of grid pieces (22) are divided into a first group of grid pieces (22) and a second group of grid pieces (22) which are arranged in sequence, wherein first ends of the grid pieces (22) of the first group are arranged flush with each other, and first ends of the grid pieces (22) of the second group are arranged gradually and sequentially close to the arc extinguishing member (21) along the first direction (a); or The first end portions of the plurality of grid plates (22) gradually approach the arc extinguishing member (21) in sequence along the first direction (a).

4. The arc extinguishing structure according to claim 1, characterized in that: The second end of at least one of the grid sheets (22) is bent, and the bending direction faces away from the stationary contact (11).

5. The arc extinguishing structure according to claim 4, characterized in that: The bending angle of the second end of the grid plate (22) is set to be 1° to 80°.

6. The arc extinguishing structure according to claim 1, characterized in that: The stationary contact assembly (1) further comprises a connecting plate (12) and a pad (13), wherein the connecting plate (12) and the pad (13) are arranged in a stacked manner along a second direction (b), the connecting plate (12) is arranged on a side of the pad (13) facing the grid sheet (22), and the stationary contact (11) is connected to the connecting plate (12); One end of the arc extinguishing member (21) is connected to the stationary contact (11) or one end of the arc extinguishing member (21) is connected to the connecting plate (12).

7. The arc extinguishing structure according to claim 1, characterized in that: The stationary contact assembly (1) further comprises a connecting plate (12) and a pad (13), wherein the connecting plate (12) and the pad (13) are arranged in a stacked manner along a second direction (b), the connecting plate (12) is arranged on a side of the pad (13) facing away from the grid sheet (22), and the stationary contact (11) is connected to the pad (13); One end of the arc extinguishing member (21) is connected to the stationary contact (11) or one end of the arc extinguishing member (21) is connected to the backing plate (13).

8. The arc extinguishing structure according to claim 1, characterized in that: The arc extinguishing member (21) comprises a U-shaped first arc extinguishing plate (211) and a second arc extinguishing plate (212) connected to one end of the first arc extinguishing plate (211); the other end of the first arc extinguishing plate (211) is connected to the stationary contact assembly (1); the second arc extinguishing plate (212) extends along a first direction (a); one end of the stationary contact (11) provided with the stationary contact point (14) sequentially penetrates two side walls of the first arc extinguishing plate (211) along a second direction (b) toward the grid sheet (22); and the second arc extinguishing plate (212) is inclinedly arranged from the stationary contact point (14) or from one of the grid sheets (22).

9. The arc extinguishing structure according to claim 1, characterized in that: The arc extinguishing structure further comprises a moving contact assembly (3), wherein the moving contact assembly (3) comprises a moving contact (31), each moving contact (31) being provided with a moving contact point (32) at both ends thereof, the moving contact assembly (3) being provided with two corresponding stationary contact assemblies (1), each moving contact (31) being provided with a short arc piece (4) respectively, the short arc piece (4) being arranged on a side of the moving contact (31) away from the moving contact point (32), and the short arc piece (4) being arranged between the grid pieces (22) of the two arc extinguishing chambers (2).

10. Low voltage electrical apparatus, characterized in that: The invention comprises the arc extinguishing structure according to any one of claims 1 to 9.

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