CN221176016U - Arc striking structure, low-voltage switch and power distribution equipment - Google Patents

Abstract

The application relates to the technical field of a low-voltage electrical appliance switch, and particularly discloses an arc striking structure, a low-voltage switch and power distribution equipment, wherein the arc striking structure comprises an arc striking plate electrically connected with a static contact of a contact assembly; the surface of the static contact is provided with a first breakdown part, and the surface of the striking plate is provided with a second breakdown part; the distance between the moving contact and the first breakdown part is a first distance, and the distance between the moving contact and the second breakdown part is a second distance; when the second distance is smaller than the first distance, an arc burning point of the arc is positioned on the arc striking plate. The arc striking structure, the low-voltage switch and the power distribution equipment provided by the application can separate the starting point and the burning point of the electric arc on the fixed contact, avoid the ablation of the electric arc on the fixed contact and improve the protection effect of the arc striking structure on the fixed contact.

Description

Arc striking structure, low-voltage switch and power distribution equipment

Technical Field

The application relates to the technical field of a low-voltage electrical appliance switch, in particular to an arc striking structure, a low-voltage switch and power distribution equipment.

Background

The high-temperature electric arc generated by the moving contact and the fixed contact of the dual-power automatic transfer switch during switching on and off can ablate the contact assembly, so that the service life of the contact assembly is greatly reduced, and the arc of the contact assembly is guided to the arc extinguishing chamber for arc extinguishing by adopting an arc striking structure. In the prior art, an arc striking plate is generally electrically connected with a static contact to guide an arc on the static contact to an arc extinguishing chamber. When the moving contact and the fixed contact are switched on and off to generate an electric arc, an arcing point and an arcing point of the electric arc, which are close to one end of the fixed contact, are both positioned on the fixed contact.

In the course of conception and implementation of the present application, the inventors found that at least the following problems exist: the arc striking structure in the prior art cannot solve the problem of ablation of the fixed contact in the initial stage of arc striking, so that the protection effect on the fixed contact is poor, the service life of a contact assembly is reduced, and the improvement of the service quality of the double-power automatic transfer switch is not facilitated.

The foregoing description is provided for general background information and does not necessarily constitute prior art.

Disclosure of utility model

Aiming at the technical problems, the application aims to provide an arc striking structure, a low-voltage switch and power distribution equipment, which can separate an arc starting point and a burning point of an arc on a fixed contact, avoid the ablation of the arc on the fixed contact and improve the protection effect of the arc striking structure on the fixed contact.

In order to solve the technical problems, the technical scheme adopted by the embodiment of the application is as follows: in a first aspect, the application discloses an arc striking structure for striking an arc on a contact assembly, the arc striking structure comprising an arc striking plate electrically connected with a stationary contact of the contact assembly; the surface of the static contact is provided with a first breakdown part, and the surface of the striking plate is provided with a second breakdown part; the distance between the moving contact and the first breakdown part is a first distance, and the distance between the moving contact and the second breakdown part is a second distance; when the second distance is smaller than the first distance, an arc burning point of the arc is positioned on the arc striking plate.

Optionally, a contact angle is arranged at the end part of the moving contact; the contact angle comprises a first end face abutting against the surface of the fixed contact and a second end face intersecting with the first end face and close to the arc striking plate; the first distance is the minimum distance between the surface of the fixed contact where the first breakdown part is located and the first end face; the second distance is the minimum distance between the surface of the striking plate where the second breakdown part is located and the second end face.

Optionally, the fixed contact comprises a fixed contact mounting part and a fixed contact body arranged on the fixed contact mounting part; the arc striking plate is U-shaped or V-shaped; the static contact body is inserted into the U-shaped or V-shaped arc striking plate, and the distances from the static contact body to the inner walls of the two sides of the U-shaped or V-shaped arc striking plate are the same. U-shaped structure

Optionally, the two sides of the U-shaped or V-shaped arc striking plate, which are close to the opening, are fixedly connected with the mounting part, and the bottom of the U-shaped or V-shaped arc striking plate extends along the movement path of the moving contact; and the U-shaped or V-shaped arc striking plate is provided with a bending part, and the bending part is used for transferring the electric arc to a direction far away from the moving contact.

Optionally, the bending part comprises a first bending plate arranged on the U-shaped or V-shaped arc striking plate and far away from the opening, and a second bending plate arranged on the opening of the U-shaped or V-shaped arc striking plate; the first bending plate and the second bending plate extend outwards along the rotation center of the movable contact.

Optionally, the second bending plate comprises two strip bending pieces connected with the opening end of the U-shaped or V-shaped arc striking plate; the two strip-shaped bending pieces are positioned on two sides of the fixed contact body.

Optionally, the two strip bending pieces are provided with mounting holes, and fastening connectors connected with the static contact mounting parts are arranged on the mounting holes in a penetrating manner.

Optionally, an included angle between a plane where the first bending plate is located and a plane where the U-shaped or V-shaped arc striking plate is located is 60-120 degrees; and/or the included angle between the plane of the second bending plate and the plane of the U-shaped or V-shaped arc striking plate is 60-120 degrees.

In a second aspect, the application discloses a low-voltage switch, comprising a shell, a contact assembly arranged in the shell, and the arc striking structure; the contact assembly comprises a fixed contact and a movable contact; the arc striking structure is arranged on the static contact and is used for guiding an electric arc on the static contact; an arc extinguishing chamber is also arranged in the shell; one end of the arc striking plate is connected with the static contact, and the other end of the arc striking plate is close to the arc extinguishing chamber and used for transferring an electric arc on the static contact to the arc extinguishing chamber.

In a third aspect, the application also discloses a power distribution device, which is characterized in that the power distribution device comprises the low-voltage switch.

The beneficial effects of the embodiment of the application include:

The arc striking structure is used for striking an arc on the contact assembly and comprises an arc striking plate electrically connected with a static contact of the contact assembly; the surface of the static contact is provided with a first breakdown part, and the surface of the striking plate is provided with a second breakdown part; the distance between the moving contact and the first breakdown part is a first distance, and the distance between the moving contact and the second breakdown part is a second distance; the movable contact and the fixed contact of the contact assembly are separated, and the second distance is smaller than the first distance, so that the arcing point of the electric arc is positioned on the arcing plate. According to the embodiment of the application, the arc can be started at the first striking part, so that the arc root is promoted to be transferred from the fixed contact to the striking plate, and the effect of separating the striking point from the burning point is formed, thereby reducing the ablation degree of the fixed contact and improving the protection effect of the striking structure on the fixed contact.

The embodiment of the application provides a low-voltage switch, which comprises a shell, a contact assembly arranged in the shell and the arc striking structure, wherein the contact assembly is arranged in the shell; the contact assembly comprises a fixed contact and a movable contact; the arc striking structure is arranged on the static contact and is used for guiding an electric arc on the static contact; an arc extinguishing chamber is also arranged in the shell; one end of the arc striking plate is connected with the static contact, and the other end of the arc striking plate is close to the arc extinguishing chamber and used for transferring an electric arc on the static contact to the arc extinguishing chamber. The low-voltage switch provided by the application can separate the starting point and the burning point of the electric arc on the fixed contact, avoid the ablation of the electric arc on the fixed contact and improve the protection effect of the arc striking structure on the fixed contact.

The power distribution equipment is provided with the arc striking assembly and the low-voltage switch, the arc striking assembly and/or the low-voltage switch are applied to the power distribution equipment, the power distribution equipment can be applied to various use scenes, and the power distribution equipment is applied to the industries of full-house intelligence, various intelligent scenes and the Internet of things so as to realize intelligent management. The method can be specifically used for: fire electricity consumption: the fire control system comprises a fire control room, a fire pump, a smoke prevention and exhaust facility, a fire elevator, a drainage pump, fire emergency lighting and the like; roadway lighting, duty lighting, guard lighting and obstacle marker lights; rail transit; a security system power supply; an electronic information machine room power supply; passenger elevator power; a sewage pump; variable-frequency speed-regulating constant-pressure water supply living pump (or else, a secondary load); the system comprises a main office, a conference room, a general office, an archive room.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an arc striking structure according to an embodiment of the present application;

FIG. 2 is a second schematic diagram of an arc striking structure according to an embodiment of the application;

FIG. 3 is a third schematic diagram of an arc striking structure according to an embodiment of the application;

Fig. 4 is a schematic structural diagram of an arc striking structure according to an embodiment of the application.

Icon: 100-moving contact; 101-a fixed contact; 102-an arc striking plate; 103-a first breakdown; 104-a second breakdown; 105-contact angle; 106-a first end face; 107-a second end face; 108-a static contact mounting part; 109-a stationary contact body; 110-a first bending plate; 111-a second bending plate; 112-mounting holes; 113-fastening connection.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

Driven by the intelligent and automatic high-new technology, the intelligent home industry enters a rapid development period. The smart home industry meets new challenges and opportunities in technological, marketing and industry revolution.

Divide intelligent house according to the function, can divide into eight modules with whole house intelligence: entertainment system, security protection system, control system, lighting system, kitchen and bathroom household electrical appliances system, network and communication system, health medical system, indoor environment system. And the eight modules are linked together, so that the whole house intelligence is finally realized.

In this digital age, people have also become increasingly dependent on electricity, and stable and reliable electricity supply is of paramount importance, whether in the home, industry or business. Among them, the circuit breaker and the change-over switch are two kinds of switches widely used. The circuit breaker is used as a protection device in a power system, can be used for protecting various devices in the power system from being damaged by overload and short circuit, and is widely applied to the power system, industrial production and household activities; the change-over switch can be automatically switched to another standby power supply under the condition that one power supply fails, so that uninterrupted power supply is realized, and normal operation of equipment is ensured, and therefore, the change-over switch is commonly used in important power distribution occasions.

The high-temperature electric arcs generated by the moving contact 100 and the fixed contact 101 of the dual-power automatic transfer switch during switching on and off ablate the contact assembly, so that the service life of the contact assembly is greatly reduced, and therefore, an arc striking structure is generally adopted to guide the electric arcs of the contact assembly to an arc extinguishing chamber for arc extinguishing. The prior art generally employs an arc striking plate 102 electrically connected to the stationary contact 101 to direct an arc on the stationary contact 101 to the arc chute. When the moving contact 100 and the fixed contact 101 are switched on and off to generate an arc, an arc starting point and an arc burning point of the arc, which are close to one end of the fixed contact 101, are both positioned on the fixed contact 101.

In the course of conception and implementation of the present application, the inventors found that at least the following problems exist: the arc striking structure in the prior art cannot solve the problem of ablation of the fixed contact 101 in the initial stage of arc striking, so that the protection effect on the fixed contact 101 is poor, the service life of a contact assembly is reduced, and the improvement of the service quality of the dual-power automatic transfer switch is not facilitated.

In view of the above, the present application provides an arc striking structure, a low voltage switch and a power distribution device for solving the above technical problems.

Referring to fig. 1, the application discloses an arc striking structure for striking an arc on a contact assembly, the arc striking structure comprising an arc striking plate 102 electrically connected with a stationary contact 101 of the contact assembly; the surface of the fixed contact 101 is provided with a first breakdown part 103, and the surface of the striking plate 102 is provided with a second breakdown part 104; the distance between the moving contact 100 and the first breakdown part 103 is a first distance, and the distance between the moving contact 100 and the second breakdown part 104 is a second distance; when the second distance is less than the first distance, the arcing point of the arc is located on the striking plate 102.

When the moving contact 100 and the fixed contact 101 of the contact assembly are just separated from each other, the second distance is larger than the first distance, and a strong electric field breakdown arcing occurs between the contacts to form a first breakdown part 103. In the continuous opening process, when the second distance is equal to the second distance, the first breakdown part 103 and the second breakdown part 104 are in an equipotential state, and when the second distance is smaller than the first distance, the electric field of the second breakdown part 104 is enhanced, so that charged particles are transferred to the rear arc striking plate 102, an arc is generated between the movable contact 100 and the arc striking plate 102, and the ablation degree of the fixed contact 101 is reduced.

Referring to fig. 1 and 2, specifically, the end of the moving contact 100 is provided with a contact angle 105; the contact angle 105 comprises a first end surface 106 abutted against the surface of the fixed contact 101, and a second end surface 107 intersected with the first end surface 106 and close to the striking plate 102; the first distance is the minimum distance between the surface of the fixed contact 101 where the first breakdown part 103 is located and the first end surface 106; the second distance is the minimum distance between the surface of the striking plate 102 where the second breakdown 104 is located and the second end face 107.

Referring to fig. 1 and 2, an arc striking structure provided in an embodiment of the present application is used for striking an arc on a contact assembly, and the arc striking structure includes an arc striking plate 102 electrically connected to a stationary contact 101 of the contact assembly; the surface of the fixed contact 101 is provided with a first breakdown part 103, and the surface of the striking plate 102 is provided with a second breakdown part 104; the distance between the moving contact 100 and the first breakdown part 103 is a first distance, and the distance between the moving contact 100 and the second breakdown part 104 is a second distance; the moving contact 100 of the contact assembly is separated from the fixed contact 101, and the second distance is smaller than the first distance, so that the arcing point of the arc is located on the striking plate 102. The embodiment of the application can start an arc at the first striking part 103, promote the arc root to be transferred from the fixed contact 101 to the striking plate 102, and form the effect of separating the striking point from the burning point, thereby reducing the ablation degree of the fixed contact 101 and improving the protection effect of the striking structure on the fixed contact 101.

Referring to fig. 3, the stationary contact 101 may alternatively include a stationary contact mounting portion 108 and a stationary contact body 109 disposed on the stationary contact mounting portion 108; the arc striking plate 102 is a U-shaped or V-shaped arc striking plate 102; the static contact body 109 is inserted into the U-shaped or V-shaped arc striking plate 102, and the distances from the static contact body 109 to the inner walls of the two sides of the U-shaped or V-shaped arc striking plate 102 are the same.

The embodiment of the application discloses a preferable arrangement structure of an arc striking plate 102, wherein a fixed contact body 109 is inserted into a U-shaped or V-shaped arc striking plate 102, so that the distances from the fixed contact body 109 to the inner walls of the two sides of the U-shaped or V-shaped arc striking plate 102 are the same, the electric arc is ensured to be smoothly transferred to the rear of the U-shaped or V-shaped arc striking plate 102, and the effective protection of the fixed contact 101 is realized.

Referring to fig. 3, alternatively, two sides of the U-shaped or V-shaped arc striking plate 102 near the opening are fixedly connected with the mounting portion, and the bottom of the U-shaped or V-shaped arc striking plate 102 extends along the movement path of the moving contact 100; the U-shaped or V-shaped striking plate 102 is provided with a bending portion for transferring the arc in a direction away from the moving contact 100.

It should be noted that, in the embodiment of the present application, the bottom of the U-shaped or V-shaped arc striking plate 102 extends along the movement path of the moving contact 100, so that an effective second breakdown portion 104 is formed between the moving contact 100 and the moving contact 100, and arc transfer is realized. Further, in the embodiment of the application, the U-shaped or V-shaped arc striking plate 102 is provided with the bending part, and the arc can be far away from the fixed contact 101 through the arrangement of the bending part, so that the fixed contact 101 is effectively protected.

Referring to fig. 3, it should be noted that the bending portion includes a first bending plate 110 disposed on the U-shaped or V-shaped striking plate 102 away from the opening, and a second bending plate 111 disposed on the opening of the U-shaped or V-shaped striking plate 102; the first bending plate 110 and the second bending plate 111 extend outwards along the rotation center of the movable contact 100.

Referring to fig. 4, further, the second bending plate 111 includes two bending bar members connected to the open ends of the U-shaped or V-shaped striking plate 102; the two strip-shaped bending pieces are positioned on two sides of the fixed contact body 109. The two strip-shaped bending pieces are provided with mounting holes 112, and the mounting holes 112 are provided with fastening connecting pieces 113 connected with the static contact mounting parts 108 in a penetrating manner.

Optionally, the angle between the plane of the first bending plate 110 and the plane of the U-shaped or V-shaped striking plate 102 is 80-120 °; and/or the included angle between the plane of the second bending plate 111 and the plane of the U-shaped or V-shaped striking plate 102 is 80-120 degrees. It should be noted that, the specific bending angles of the first bending plate 110 and the second bending plate 111 can be selected by those skilled in the art according to the needs, and are not particularly limited herein.

The application discloses a low-voltage switch, which comprises a shell, a contact assembly arranged in the shell and the arc striking structure, wherein the contact assembly is arranged in the shell; the contact assembly comprises a fixed contact 101 and a movable contact 100; the arc striking structure is arranged on the fixed contact 101 and is used for guiding an electric arc on the fixed contact 101; an arc extinguishing chamber is also arranged in the shell; one end of the striking plate 102 is connected with the fixed contact 101, and the other end is close to the arc extinguishing chamber, so that the arc on the fixed contact 101 is transferred to the arc extinguishing chamber. The low-voltage switch provided by the application can separate the starting point and the burning point of the electric arc on the fixed contact 101, avoid the ablation of the electric arc on the fixed contact 101, and improve the protection effect of the arc striking structure on the fixed contact 101.

The embodiment of the application also provides a power distribution device, wherein the power distribution device is provided with the low-voltage switch, and the power distribution device can be configured as at least one of the following: distribution box, cable, switch board, motor, switch socket, lamps and lanterns, air conditioner, electric water heater, ammeter, camera, phone, computer etc.. The power distribution equipment can use the related 1 structure of the transfer switch of the application to realize intelligent management, but is not limited to the power distribution equipment with the intelligent management, and can also be used in the non-intelligent power distribution equipment in the traditional industry.

The embodiment of the application also provides a power distribution device, wherein the low-voltage switch is applied to the power distribution device, and the power distribution device can be applied to intelligent scenes, intelligent home, the Internet of things industry and more intelligent scenes so as to realize intelligent management.

Alternatively, the embodiment of the application can be used for: fire electricity consumption: the fire control system comprises a fire control room, a fire pump, a smoke prevention and exhaust facility, a fire elevator, a drainage pump, fire emergency lighting and the like; roadway lighting, duty lighting, guard lighting and obstacle marker lights; rail transit; a security system power supply; an electronic information machine room power supply; passenger elevator power; a sewage pump; variable-frequency speed-regulating constant-pressure water supply living pump (or else, a secondary load); the system comprises a main office, a conference room, a general office, an archive room.

It can be understood that the above scenario is merely an example, and does not constitute a limitation on the application scenario of the technical solution provided by the embodiment of the present application, and the technical solution of the present application may also be applied to other scenarios. For example, as one of ordinary skill in the art can know, with the evolution of the system architecture and the appearance of new service scenarios, the technical solution provided by the embodiment of the present application is also applicable to similar technical problems.

The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

The steps in the method of the embodiment of the application can be sequentially adjusted, combined and deleted according to actual needs.

The units in the device of the embodiment of the application can be combined, divided and deleted according to actual needs.

In the present application, the same or similar term concept, technical solution and/or application scenario description will be generally described in detail only when first appearing and then repeatedly appearing, and for brevity, the description will not be repeated generally, and in understanding the present application technical solution and the like, reference may be made to the previous related detailed description thereof for the same or similar term concept, technical solution and/or application scenario description and the like which are not described in detail later.

In the present application, the descriptions of the embodiments are emphasized, and the details or descriptions of the other embodiments may be referred to.

The technical features of the technical scheme of the application can be arbitrarily combined, and all possible combinations of the technical features in the above embodiment are not described for the sake of brevity, however, as long as there is no contradiction between the combinations of the technical features, the application shall be considered as the scope of the description of the application.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. An arc striking structure for striking an arc on a contact assembly, characterized in that the arc striking structure comprises an arc striking plate (102) electrically connected with a stationary contact (101) of the contact assembly; the surface of the fixed contact (101) is provided with a first breakdown part (103), and the surface of the striking plate (102) is provided with a second breakdown part (104); the distance between the moving contact (100) and the first breakdown part (103) of the contact assembly is a first distance, and the distance between the moving contact (100) and the second breakdown part (104) is a second distance; when the second distance is smaller than the first distance, an arc point of the arc is located on the striking plate (102).

2. The arc striking structure according to claim 1, characterized in that the end of the moving contact (100) is provided with a contact angle (105); the contact angle (105) comprises a first end surface (106) abutted against the surface of the fixed contact (101), and a second end surface (107) intersecting the first end surface (106) and being close to the arc striking plate (102); the first distance is the minimum distance between the surface of the static contact (101) where the first breakdown part (103) is located and the first end face (106); the second distance is the minimum distance between the surface of the striking plate (102) where the second breakdown part (104) is located and the second end face (107).

3. The arcing structure according to claim 1, characterized in that the stationary contact (101) comprises a stationary contact mounting part (108) and a stationary contact body (109) arranged on the stationary contact mounting part (108); the arc striking plate (102) is a U-shaped or V-shaped arc striking plate (102); the static contact body (109) is inserted into the U-shaped or V-shaped arc striking plate (102), and the distances from the static contact body (109) to the inner walls of the two sides of the U-shaped or V-shaped arc striking plate (102) are the same.

4. The arc striking structure according to claim 3, characterized in that the two sides of the U-shaped or V-shaped arc striking plate (102) close to the opening are fixedly connected with the mounting part, and the bottom of the U-shaped or V-shaped arc striking plate (102) extends along the movement path of the moving contact (100); the U-shaped or V-shaped arc striking plate (102) is provided with a bending part, and the bending part is used for transferring an electric arc to a direction far away from the moving contact (100).

5. The arc striking structure according to claim 4, characterized in that the bending portion comprises a first bending plate (110) arranged at the U-shaped or V-shaped arc striking plate (102) away from the opening and a second bending plate (111) arranged at the opening of the U-shaped or V-shaped arc striking plate (102); the first bending plate (110) and/or the second bending plate (111) extend outwards along the rotation center of the movable contact (100).

6. The striking structure according to claim 5, characterized in that said second bending plate (111) comprises two strip-shaped bending pieces connected to the open ends of said U-shaped or V-shaped striking plate (102); the two strip-shaped bending pieces are positioned on two sides of the fixed contact body (109).

7. The arc striking structure according to claim 6, wherein the two strip-shaped bending pieces are provided with mounting holes (112), and fastening connectors (113) connected with the static contact mounting parts (108) are arranged on the mounting holes (112) in a penetrating manner.

8. The arc striking structure as claimed in claim 5, wherein the first bending plate (110) has an angle of 60-120 ° with the plane of the U-shaped or V-shaped arc striking plate (102); and/or the included angle between the plane of the second bending plate (111) and the plane of the U-shaped or V-shaped arc striking plate (102) is 60-120 degrees.

9. A low voltage switch comprising a housing, a contact assembly disposed within the housing, and an arcing structure according to any of claims 1-8; the contact assembly comprises a fixed contact (101) and a movable contact (100); the arc striking structure is arranged on the fixed contact (101) and is used for guiding an electric arc on the fixed contact (101); an arc extinguishing chamber is also arranged in the shell; one end of the arc striking plate (102) is connected with the fixed contact (101), and the other end of the arc striking plate is close to the arc extinguishing chamber and used for transferring an electric arc on the fixed contact (101) to the arc extinguishing chamber.

10. A power distribution device comprising the low voltage switch of claim 9.