Electric switch

Abstract

An electrical switch comprises a frame (2), a first stationary contact (41), a rotating contact (8) and a plurality of arc extinguisher members. The plurality of arc extinguisher members have a guide projection system adapted to guide an arc (77) generated during an open event of the electrical switch to a tortuous path in which the arc (77) advances in the plurality of arc extinguisher members in a transverse direction parallel to the axis of rotation of the rotating contact (8), thereby extending the arc. The guide projection system includes a plurality of guide projections each projecting from a body portion of a corresponding arc extinguisher member toward an adjacent arc extinguisher member and providing a shortest path for an arc (77) between two arc extinguisher members.

Description

Technical Field

[0001] This invention relates to an electrical switch. Background Technology

[0002] An electric switch is a device suitable for disconnecting and shutting off circuits connected to it. When a circuit is disconnected by an electric switch, an electric arc with temperatures reaching thousands of degrees Celsius can occur within the switch. The arc consists of ionized gas, which contains a large number of free electrons. This type of gas plasma is conductive.

[0003] Electric arcing delays the transition of an electrical switch from the on state to the off state. Furthermore, electric arcing is generally harmful to electrical switches and electrical components that include them.

[0004] It is known in the art to use arc-extinguishing components, such as arc-extinguishing plates, to reduce the duration of arcing in electrical switches. Examples of known electrical switches equipped with arc-extinguishing plates are described in publications EP3457423A1, CN113593996A, and WO2018086350A1. Summary of the Invention

[0005] The object of this invention is to provide an electrical switch having an improved structure for arc extinguishing. This object is achieved by the electrical switch described below.

[0006] This invention is based on the idea of ​​providing an arc-extinguishing component of an electrical switch with a guiding protrusion system adapted to guide an electric arc generated during an opening event of the electrical switch to a tortuous path, in which the arc advances in the arc-extinguishing component in a transverse direction parallel to the axis of rotation of the rotating contacts of the electrical switch, thereby prolonging the arc. The guiding protrusion system includes a plurality of guiding protrusions, each protruding from the body portion of a corresponding arc-extinguishing component toward an adjacent arc-extinguishing component, and providing the shortest path for the arc between two arc-extinguishing components. The positions of the guiding protrusions alternate from one side to the other to form a tortuous or meandering path for the arc.

[0007] One advantage of the electric switch of the present invention is that the arc is not only longer, but it also advances in the lateral direction in the arc extinguisher component, thereby further improving the cooling of the arc. Attached Figure Description

[0008] The present invention will now be described in more detail with reference to the accompanying drawings and preferred embodiments, in which...

[0009] Figure 1 This is a side view of an electrical switch according to an embodiment of the present invention;

[0010] Figure 2 It shows Figure 1The components of the electrical switch, and the electric arc generated during the disconnection event of the electrical switch;

[0011] Figure 3 The direction of inclination relative to the rotation axis of the rolling element of the electric switch is shown. Figure 1 The first stationary contact of the electrical switch and multiple arc-extinguishing components;

[0012] Figure 4 The first stationary contact of the electrical switch and a plurality of arc-extinguishing components according to an alternative embodiment of the present invention are shown;

[0013] Figure 5 It shows the arc passing through Figure 4 The routes of the multiple arc-extinguishing device components are shown;

[0014] Figure 6 It shows Figure 1 The first arc-extinguishing component of the electrical switch;

[0015] Figure 7 It shows Figure 1 The second arc-extinguishing component of the electrical switch;

[0016] Figure 8 It is shown from a direction perpendicular to the plane defined by the main body of the first arc-extinguishing device component. Figure 6 The first arc extinguisher component, and the cross section of the first arc extinguisher component along line AA;

[0017] Figure 9 A first variation of the first arc-extinguishing device component is shown;

[0018] Figure 10 A first variant of the second arc-extinguishing device is shown;

[0019] Figure 11 The path of the electric arc through multiple arc-extinguishing components is shown, including... Figure 9 and Figure 10 The first variant of the first arc-extinguishing device component and the second arc-extinguishing device component shown;

[0020] Figure 12 The path of the electric arc through multiple arc-extinguishing components is shown, including... Figure 10 The second arc-extinguishing device component and the first variant of the intermediate arc-extinguishing device component are shown;

[0021] Figure 13 A second variation of the first arc-extinguishing device is shown;

[0022] Figure 14 A third variation of the first arc-extinguishing device is shown;

[0023] Figure 15 A fourth variation of the first arc-extinguishing device is shown;

[0024] Figure 16 A portion of the components of an electrical switch according to another embodiment including a guide wall system is shown; and

[0025] Figure 17 yes Figure 16 A partial side view of the component shown. Detailed Implementation

[0026] Figure 1 This is a side view of an electrical switch according to an embodiment of the present invention. The electrical switch includes a frame 2, a first stationary contact 41, a second stationary contact 42, a rolling element 6, a rotating contact 8, and a plurality of arc-extinguishing components. Figure 1 In order to show the internal structure of the electric switch, half of frame 2 is omitted.

[0027] The first stationary contact 41 is stationarily fixed to the frame 2 and is adapted to be connected to a power source. The second stationary contact 42 is stationarily fixed to the frame 2 and is adapted to be connected to a load. The first stationary contact 41 and the second stationary contact 42 are made of conductive material. The frame 2 is made of electrically insulating material.

[0028] The rolling element 6 is made of an electrically insulating material and is adapted to rotate relative to the frame 2 about a rotation axis 16 between a first position and a second position. Figure 1 In the image plane, the rotation axis 16 is perpendicular to the image plane.

[0029] The rotary contact 8 is stationary and fixed to the rolling element 6. The rotary contact 8 is made of conductive material and includes a first contact portion 81 and a second contact portion 82. The angular displacement between the first contact portion 81 and the second contact portion 82 relative to the axis of rotation 16 is 180°.

[0030] In the first position of the rolling element 6, the first contact portion 81 is conductively connected to the first stationary contact 41, and the second contact portion 82 is conductively connected to the second stationary contact 42. In the second position of the rolling element 6, the rotating contact 8 is disconnected from the first stationary contact 41 and the second stationary contact 42. In one embodiment, the angular displacement between the first position and the second position of the rolling element is greater than or equal to 90°.

[0031] The rolling element 6 is adapted to rotate from a first position to a second position when the electrical switch is open. The disconnection event is adapted to disconnect the conductive connection between the first stationary contact 41 and the second stationary contact 42.

[0032] Multiple arc-extinguishing components are adapted to extinguish arcs generated during disconnection events between the first stationary contact 41 and the first contact portion 81 of the rotating contact 8, and between the second stationary contact 42 and the second contact portion 82 of the rotating contact 8. The arc between the first stationary contact 41 and the first contact portion 81 is extinguished in the same manner as the arc between the second stationary contact 42 and the second contact portion 82.

[0033] For the sake of simplicity, this document only explains in detail the extinguishing of the arc generated during a disconnection event between the first stationary contact 41 and the first contact portion 81 of the rotating contact 8. Therefore, the various arc extinguishing components referred to below are those suitable for extinguishing the arc between the first stationary contact 41 and the first contact portion 81 of the rotating contact 8.

[0034] Multiple arc-extinguishing components are located adjacent to the path, and during the initiation of a disconnection event, the free end of the first contact portion 81 moves along the path. Each of the multiple arc-extinguishing components includes a substantially flat body portion made of a conductive material. The multiple arc-extinguishing components are arranged in a “fan” shape such that the planes defined by the substantially flat body portions of the arc-extinguishing components intersect each other at a location adjacent to the axis of rotation 16.

[0035] exist Figure 1 There are five first arc-extinguishing components 11 and five second arc-extinguishing components 12, which are adjacent to the path of movement of the free end of the first contact portion 81 during the start of the disconnection event. The first arc-extinguishing components 11 and the second arc-extinguishing components 12 alternate in the circumferential direction relative to the axis of rotation 16.

[0036] Figure 2 It shows Figure 1 The components of the electrical switch, and the arc 77 generated between the first stationary contact 41 and the first contact portion 81 of the rotating contact 8 during the disconnection event of the electrical switch. Figure 2 It is a side view of the image plane perpendicular to the rotation axis 16.

[0037] Figure 3 The first stationary contact 41 of the electric switch and multiple arc-extinguishing components are shown in a direction inclined relative to the axis of rotation 16. Figure 3A guiding protrusion system is shown, comprising a first guiding protrusion 31 on a first transverse portion of each first arc-extinguishing device 11 and a second guiding protrusion 32 on a second transverse portion of each second arc-extinguishing device 12, wherein the first and second transverse portions are located on opposite sides of a central plane perpendicular to the axis of rotation 16. Each first guiding protrusion 31 and each second guiding protrusion 32 is adapted to provide the shortest path from the arc-extinguishing member with the guiding protrusion to the next arc-extinguishing member in the arc direction, such that the guiding protrusion system is adapted to extend the arc. Both the first guiding protrusion 31 and the second guiding protrusion 32 protrude circumferentially from the body portion of the corresponding arc-extinguishing member. The arc-extinguishing members are spaced apart from each other circumferentially.

[0038] exist Figure 2 In the middle, the direction of the electric arc is clockwise. Figure 2 The guide protrusion system is shown to be farther from the axis of rotation 16 than the free end of the first contact portion 81, thereby extending the arc 77 by increasing the radius of the arc 77.

[0039] exist Figure 3 In the center, the first lateral portion is on the left and the second lateral portion is on the right. Multiple arc-extinguishing components are positioned symmetrically relative to the central plane such that the central plane divides each arc-extinguishing component into two equal-width portions. The central plane passes through the arcuate section 417 of the first stationary contact 41, wherein the arcuate section 417 is the section from which the arc 77 is adapted to be transmitted to the multiple arc-extinguishing components during a disconnection event.

[0040] Figure 4 The first stationary contact 41 of an electrical switch and a plurality of arc-extinguishing components are shown according to an alternative embodiment of the invention. Figure 4 In this process, multiple arc-extinguishing components are stacked together such that the planes defined by the substantially flat main body portions of the arc-extinguishing components are parallel to each other.

[0041] Figure 5 The arc 77 is shown passing through Figure 4 The routes of the multiple arc-extinguishing device components are shown. Figure 5 The image plane is perpendicular to the plane defined by the substantially flat main body portion of the arc-extinguishing device component. Figure 5 In the middle, the electric arc 77 moves along a path that resembles a rectangular wave.

[0042] Figure 6 The first arc-extinguishing device 11 is shown as a separate component, and Figure 7 The second arc-extinguishing device 12 is shown as a separate component. Figure 8The first arc-extinguishing member 11 is shown in a direction perpendicular to the plane defined by the main body portion of the first arc-extinguishing member 11, and in a cross-section along line AA. Except for the location of the guide protrusion, the first arc-extinguishing member 11 and the second arc-extinguishing member 12 are identical to each other.

[0043] The first guide protrusion 31 protrudes from the main body of the first arc-extinguishing member 11 in a direction perpendicular to the plane defined by the planar body. The second guide protrusion 32 protrudes from the main body of the second arc-extinguishing member 12 in a direction perpendicular to the plane defined by the planar body. The guide protrusions 31 and 32 have circular cross-sections in a plane parallel to the plane defined by the planar body of the arc-extinguishing member.

[0044] Multiple arc-extinguishing components are made of metal sheets. The guide protrusion system is an integral part of the multiple arc-extinguishing components. The guide protrusion system is manufactured through a mechanical deformation forming process.

[0045] Both the first guide protrusion 31 and the second guide protrusion 32 are closed protrusions, so that they do not provide holes through the corresponding arc-extinguishing device components. The first guide protrusion 31 and the second guide protrusion 32 are identical protrusions.

[0046] Both the first guide protrusion 31 and the second guide protrusion 32 protrude 0.75 mm from the main body portion of the corresponding arc-extinguishing member, and the thickness of the main body portion is 1.5 mm. In an alternative embodiment, each of the plurality of guide protrusions protrudes at least 0.4 mm from the main body portion of the corresponding arc-extinguishing member in a direction perpendicular to the plane defined by the main body portion. The thickness of the main body portion of each arc-extinguishing member is in the range of 1.0 mm to 3.0 mm.

[0047] In one embodiment, for each of the plurality of guide protrusions, the surface area of ​​the protrusion of the guide protrusion on the plane defined by the body portion of the arc extinguisher member is greater than or equal to 2% of the surface area of ​​the protrusion of the arc extinguisher member, and the guide protrusion protrudes from the body portion.

[0048] In another embodiment, for each of the plurality of guide protrusions, on the plane defined by the main body portion of the arc-extinguishing member from which the guide protrusion protrudes, the surface area of ​​the protrusion of the guide protrusion is greater than or equal to 5% of the surface area of ​​the protrusion of the outer section of the arc-extinguishing member, wherein the outer section of the arc-extinguishing member is radially outwardly positioned relative to the rotating contact. In other words, the outer section of the arc-extinguishing member is radially outwardly positioned relative to a straight cylinder whose centerline coincides with the axis of rotation, wherein the radius is equal to the distance from the free end of the first contact portion of the rotating contact to the axis of rotation, and the height is infinite.

[0049] In one embodiment, the center point of each guide protrusion is located on the side portion of the outer section of the arc extinguisher member, wherein the lateral distance of the side portion from the center point of the arc extinguisher member is greater than or equal to 25% of the lateral dimension of the outer section of the arc extinguisher member.

[0050] Figure 9 A first variant 11-1 of a first arc-extinguishing device component is shown, comprising a first guide protrusion 31 on a first transverse portion of the first variant 11-1 of the first arc-extinguishing device component, and a third guide protrusion 33 on a second transverse portion of the first variant 11-1 of the first arc-extinguishing device component, wherein the first transverse portion and the second transverse portion are located on opposite sides of a central plane perpendicular to the axis of rotation. The first guide protrusion 31 and the third guide protrusion 33 project from the main body portion of the first variant 11-1 of the first arc-extinguishing device component in opposite directions. An electric arc is adapted to enter the first variant 11-1 of the first arc-extinguishing device component through the third guide protrusion 33 and exit the first variant 11-1 of the first arc-extinguishing device component through the first guide protrusion 31.

[0051] The first guide protrusion 31 and the third guide protrusion 33 are identical protrusions. Except for the third guide protrusion 33, the first variant 11-1 of the first arc extinguisher component is the same as... Figure 6 The first arc extinguisher component 11 shown is the same.

[0052] Figure 10 A first variant 12-1 of the second arc-extinguishing device is shown, comprising a fourth guide protrusion 34 on a first transverse portion of the first variant 12-1 and a second guide protrusion 32 on a second transverse portion of the first variant 12-1, wherein the first and second transverse portions are located on opposite sides of a central plane perpendicular to the axis of rotation. The second guide protrusion 32 and the fourth guide protrusion 34 protrude from the main body portion of the first variant 12-1 of the second arc-extinguishing device in opposite directions. The second guide protrusion 32 and the fourth guide protrusion 34 are identical protrusions. Except for the fourth guide protrusion 34, the first variant 12-1 of the second arc-extinguishing device is identical to... Figure 7 The second arc-extinguishing device 12 shown is the same.

[0053] Figure 11 The path of the electric arc 77 through multiple arc extinguishing components is shown, wherein a first variant 11-1 of the first arc extinguishing component and a first variant 12-1 of the second arc extinguishing component alternate. Figure 11The arc 77 is shown to be transmitted from the first guide protrusion 31 of the first variant 11-1 of the first arc-extinguishing member to the fourth guide protrusion 34 of the first variant 12-1 of the second arc-extinguishing member. From the first variant 12-1 of the second arc-extinguishing member, the arc 77 is transmitted via the second guide protrusion 32 of the first variant 12-1 of the second arc-extinguishing member to the third guide protrusion 33 of the next first variant 11-1 of the first arc-extinguishing member.

[0054] Figure 12 The path of the electric arc 77 through multiple arc-extinguishing components is shown, wherein the second arc-extinguishing component and the first variant 12-1 of the intermediate arc-extinguishing component 13 alternate. Each intermediate arc-extinguishing component 13 is an arc-extinguishing component without a guide protrusion. Except for the omitted guide protrusion, the intermediate arc-extinguishing component 13 is identical to the first arc-extinguishing component 11 and the second arc-extinguishing component 12.

[0055] exist Figure 12 In the middle, the electric arc 77 is transmitted from the intermediate arc extinguisher component 13 to the fourth guide protrusion 34 of the first variant 12-1 of the second arc extinguisher component. From the first variant 12-1 of the second arc extinguisher component, the electric arc 77 is transmitted through the second guide protrusion 32 of the first variant 12-1 of the second arc extinguisher component to the next intermediate arc extinguisher component 13.

[0056] Figure 13 A second variant 11-2 of the first arc-extinguishing device component is shown. A first guide protrusion 31-2 protrudes from the main body portion of the second variant 11-2 of the first arc-extinguishing device 11-2 in a direction perpendicular to the plane defined by the planar body. A third guide protrusion 33-2 protrudes from the main body portion of the second variant 11-2 of the first arc-extinguishing device component 11-2 in a direction perpendicular to the plane defined by the planar body.

[0057] The first guide protrusion 31-2 is formed by providing a first protrusion on the main body portion of the second variant 11-2 of the first arc-extinguishing device 11-2 and bending the first protrusion in a first direction. The third guide protrusion 33-2 is formed by providing a second protrusion on the main body portion of the second variant 11-2 of the first arc-extinguishing device 11-2 and bending the second protrusion in a second direction opposite to the first direction. Both the first guide protrusion 31-2 and the third guide protrusion 33-2 are located on the distal edge of the main body portion. The distal edge of the main body portion is the edge furthest from the axis of rotation. Except for the guide protrusions, the second variant 11-2 of the first arc-extinguishing device member is the same as the intermediate arc-extinguishing device member 13.

[0058] Figure 14A third variant 11-3 of the first arc-extinguishing device component is shown. A first guide protrusion 31-3 protrudes from the main body portion of the third variant 11-3 of the first arc-extinguishing device component in a direction perpendicular to the plane defined by the planar body. The first guide protrusion 31-3 is formed by bending the distal corner of the main body portion in a first direction. The distal corner of the main body portion is an angle away from the axis of rotation and the central plane.

[0059] Except for the first guide protrusion 31-3, the third variant 11-3 of the first arc-extinguishing component is the same as that of the intermediate arc-extinguishing component 13. It is possible to manufacture the third variant 11-3 of the first arc-extinguishing component by bending the distal corner of the main body in the first direction.

[0060] Figure 15 A fourth variant 11-4 of the first arc-extinguishing device component is shown. A first guide protrusion 31-4 protrudes from the main body portion of the fourth variant 11-4 of the first arc-extinguishing device component in a direction perpendicular to the plane defined by the planar body. The first guide protrusion 31-4 has a rectangular cross-section in a plane parallel to the planar body portion of the fourth variant 11-4, which is a first arc-shaped portion. The first guide protrusion 31-4 is a crease or fold that extends through the main body portion of the fourth variant 11-4 of the first arc-extinguishing device component in a direction perpendicular to the axis of rotation.

[0061] The first guide protrusion 31-4 is disposed on a portion of the main body that is farther from the axis of rotation than the free end of the first contact portion. Therefore, the entire first guide protrusion 31-4 is farther from the axis of rotation than the free end of the first contact portion.

[0062] Except for the first guide protrusion 31-4, the fourth variant 11-4 of the first arc-extinguishing component is the same as that of the intermediate arc-extinguishing component 13. It is possible to manufacture the fourth variant 11-4 of the first arc-extinguishing component from the intermediate arc-extinguishing component 13 by forming a linear crease in the main body of the intermediate arc-extinguishing component 13.

[0063] Figure 16 Parts of an electrical switch component according to another embodiment including a guide wall system are shown, and Figure 17 yes Figure 16 A partial side view of the component shown.

[0064] exist Figure 16In one embodiment, the plurality of arc-extinguishing components include four first arc-extinguishing components 11 and four second arc-extinguishing components 12, such that the first arc-extinguishing components 11 and the second arc-extinguishing components 12 alternate in the arc direction. The guide wall system is adapted to guide airflow within the frame during a disconnection event to increase the likelihood of the arc advancing through the guide protrusion system. The airflow is inherently generated by the arc. The guide wall system includes an initial guide wall section 21, five intermediate guide wall sections 22, and an end guide wall section 23.

[0065] Each intermediate guide wall segment 22 is located between two consecutive arc-extinguishing elements and is adapted to block radially outward airflow between the consecutive arc-extinguishing elements at a location spaced apart from the desired arc position, while allowing radially outward airflow adjacent to the desired arc position, which is the location where the guide protrusion system is adapted to provide the shortest path between the consecutive arc-extinguishing elements. Due to the intermediate guide wall segments 22, the airflow guides the arc laterally to the location of the guide protrusion and radially outward in a direction perpendicular to the axis of rotation. In other words, by utilizing the airflow inherently generated by the arc, the guide wall system ensures that the arc is guided to the optimal position among the multiple arc-extinguishing elements.

[0066] At the start of the arc, the arc is transmitted from the first stationary contact to the nearest arc-extinguishing member, and subsequently from the last arc-extinguishing member in the group to the first contact portion of the rotating contact. The transition from the first stationary contact to the first contact portion of the rotating contact differs from the transition between the arc-extinguishing members. Therefore, the initial guide wall section 21 and the final guide wall section 23 differ from the intermediate guide wall section 22. Furthermore, the initial guide wall section 21 differs from the final guide wall section 23. It should be noted that in Figure 16 In one embodiment, the first arc-extinguishing component among the multiple arc-extinguishing components is located radially more inward than the other arc-extinguishing components, which also affects the design of the initial guide wall section 21.

[0067] The guide wall system is an integral part of the electrical switch frame, such that the starting guide wall section 21, the intermediate guide wall section 22, and the ending guide wall section 23 are manufactured through the same process as the frame. In one embodiment, the process is an injection molding process.

[0068] It will be apparent to those skilled in the art that the concept of the present invention can be implemented in various ways. The present invention and its embodiments are not limited to the examples described above, but can be varied within the scope of the claims.

Claims

1. An electrical switch, comprising: Framework (2); First stationary contact (41), which is stationary and fixed to the frame (2); A rolling element (6) adapted to rotate relative to the frame (2) about a rotation axis (16) between a first position and a second position; A rotating contact (8) is stationarily fixed to the rolling element (6) and includes a first contact portion (81) such that in the first position of the rolling element (6), the first contact portion (81) is electrically connected to the first stationary contact (41), and in the second position of the rolling element (6), the rotating contact (8) is disconnected from the first stationary contact (41). as well as A plurality of arc-extinguishing components for extinguishing an electric arc (77) generated during a disconnection event between the first stationary contact (41) and the first contact portion (81) of the rotating contact (8), wherein the plurality of arc-extinguishing components are adjacent to the path of the first contact portion (81), and wherein each of the plurality of arc-extinguishing components includes a body portion made of a conductive material. The plurality of arc-extinguishing components are characterized in that they have a guiding protrusion system adapted to guide the electric arc (77) to a tortuous path in which the electric arc (77) advances in the plurality of arc-extinguishing components in a transverse direction parallel to the rotation axis (16), thereby prolonging the electric arc. The guide protrusion system includes a plurality of guide protrusions, each protruding from the body portion of the corresponding arc extinguisher component toward the adjacent arc extinguisher component, and providing the shortest path for the arc (77) between the two arc extinguisher components.

2. The electrical switch according to claim 1, wherein the guide protrusion system is farther from the rotation axis (16) than the first contact portion (81) of the rotary contact (8).

3. The electrical switch according to claim 1 or 2, wherein the guide protrusion system is an integral part of the plurality of arc-extinguishing components.

4. The electrical switch according to claim 1, wherein the plurality of arc-extinguishing components are made of metal sheets.

5. The electrical switch according to claim 4, wherein the guide protrusion system is manufactured by a mechanical deformation forming process.

6. The electrical switch of claim 1, wherein each guide protrusion protrudes from the body portion of the corresponding arc-extinguishing member in a direction perpendicular to the plane defined by the body portion.

7. The electrical switch according to claim 1, wherein the guide protrusion system comprises a plurality of guide protrusions on one side of a central plane perpendicular to the axis of rotation (16) and a plurality of guide protrusions on the other side of the central plane such that the central plane passes through an arcuate section (417) of the first stationary contact (41), wherein the arcuate section (417) is a section from which the arc (77) is adapted to be transmitted to the plurality of arc extinguishing components during the disconnection event.

8. The electrical switch of claim 1, wherein each of the plurality of guide protrusions protrudes at least 0.4 mm from the body portion of the corresponding arc extinguisher member in a direction perpendicular to the plane defined by the body portion.

9. The electrical switch of claim 1, wherein each of the plurality of guide protrusions is a closed protrusion.

10. The electrical switch of claim 1, wherein for each of the plurality of guide protrusions, on a plane defined by the body portion of the arc extinguisher member, the surface area of ​​the protrusion of the guide protrusion is greater than or equal to 2% of the surface area of ​​the protrusion of the arc extinguisher member, and the guide protrusion protrudes from the body portion.

11. The electrical switch according to claim 1, wherein for each of the plurality of guide protrusions, on the plane defined by the body portion of the arc extinguisher member, the surface area of ​​the protrusion of the guide protrusion is greater than or equal to 5% of the surface area of ​​the protrusion of the outer section of the arc extinguisher member, the guide protrusion protruding from the body portion, wherein the outer section of the arc extinguisher member is radially outwardly positioned relative to the rotary contact (8).

12. The electric switch of claim 1, wherein the electric switch has a guide wall system adapted to guide the airflow generated by the electric arc (77) during the disconnection event, thereby increasing the likelihood that the electric arc (77) will advance through the guide protrusion system.

13. The electrical switch of claim 12, wherein the guide wall system comprises a plurality of intermediate guide wall segments (22), each intermediate guide wall segment being located between two consecutive arc extinguishing members and adapted to form a radially outward airflow between the consecutive arc extinguishing members at a location laterally spaced from a desired arc location, and allowing the radially outward airflow to be adjacent to the desired arc location, wherein the desired arc location is a location in which the guide wall segments are adapted to provide the shortest path between the consecutive arc extinguishing members.

14. The electrical switch according to claim 12, wherein the guide wall system is an integral part of the frame (2).

Images