DESC:FIELD OF THE INVENTION
The present invention relates to an earthing device or ON/OFF switch, or any switchgear used in electrical applications. More particularly, the present invention relates the high voltage disconnecting and earthing device which are used to apply the high voltage to electrical applications.
BACKGROUND OF INVENTION
The earthing device connects/disconnects the incoming power to the circuits comprising loads. When manually operated or operated by any means to connect the load to the power source, the incoming power flows to the loads.
The switch consists of two separate sets of contacts, one set for incoming power supplies and another set for connecting the power supplies to the load. The switching is usually done by the operation of a cam and cam follower that makes the contacts to make/break to connect/disconnect the load from the power source. The cam is mounted on the first end of a cam shaft which is rotatably mounted on a housing that comprises the terminals. A knob/handle is provided on the second end of the cam shaft that carries the cam in such a manner that the rotation of knob/handle alters the position of the cam from a first position to a second position to facilitate lifting and lowering the moveable terminals operably connected to the cam follower. This establishes contact between moveable contacts and the fixed contacts to change a circuit from one set of connections to another.
The switch known in the art consists of four stationary contacts and two moving contacts. One moving contact and two stationary contacts are known as ONE Pole and are designed to take up 750 V. For example, for 1000V applications it is required to construct the switch with TWO poles and connecting the stationary contacts through an external link to make the contacts in series connection. This construction is capable of withstanding 1000 volts of operating voltage of any required current rating. In spite of that the above construction comprises all the elements required for TWO pole application due to the inter connection of contacts by an external link, it is necessary to use two switches interlinked together which is very expensive.
Accordingly, there exists a need to develop a single switch that comprises all the elements required for TWO pole application and such construction which will be cost effective.
OBJECTS OF INVENTION
It is an object of the present invention to overcome the problem faced in the prior art.
It is the main objective of the present invention to provide disconnecting and earthing device for high voltage application having all the elements contained within a single housing.
It is another objective of the present invention to provide a disconnecting and earthing device for high voltage application having FOUR Stages with each stage consisting of ONE pole suitable for high voltage application.
It is another objective of the present invention to provide a 4-pole disconnecting and earthing device for high voltage application bigger housing to provide higher creepage and higher clearances between the poles.
It is another objective of the present invention to provide a 4-pole disconnecting and earthing device for high voltage application wherein the poles are arranged within the housing at different planes.
It is another objective of the present invention to provide a 4-pole disconnecting and earthing device for high voltage application wherein two cams are arranged on behind the other for the actuation of the moving contacts fitted to the cam follower.
It is another objective of the present invention to provide a 4-pole disconnecting and earthing device for high voltage application constructed with 2 stages each having 2 stages.
SUMMARY OF INVENTION
A disconnecting and earthing device for high voltage electrical applications comprises,
a switch housing, a cam shaft mounted with a cam is housed within the switch housing, cam followers loaded with a spring having moveable contacts are housed within the switch housing, fixed contact strips having fixed contacts are mounted within the switch housing, fixed contact strips are connected by a link,
wherein the cam can be swiveled between a first position and a second position to performs the ON /OFF function of the switch,
wherein two such switches assembled together with their cam shafts coupled together form a ONE stage TWO pole switch characterized in that,
A ONE stage TWO pole disconnecting and earthing device comprises,
a switch housing,
a cam shaft mounted with cam is housed within the switch housing,
cam followers carrying the moving contacts which are housed within the switch housing are loaded with spring,
a first fixed contact strip having a first fixed contact having second fixed contact having third fixed contact and fourth fixed contact having fifth fixed contact having sixth fixed contact having seventh fixed contact and eighth fixed contact are mounted within the switch housing,
wherein the cam followers carrying the fixed contacts the second fixed contact strip having second fixed contact having third fixed contact and fourth fixed contact having fifth fixed contact forms the first pole,
wherein, the cam followers carrying the fixed contacts having first contact having sixth fixed contact having seventh fixed contact and eighth fixed contact forms the second pole,
wherein the cam can be swiveled between a first position and a second position, wherein in the first position of the cam the moving contacts are connected to the fixed contacts and the moving contacts are disconnected from the fixed contacts and
wherein in the second position of the cam the moving contacts are in contact with the fixed contacts and the moving contacts are disconnected from the fixed contacts

A disconnecting and earthing device for high voltage electrical applications comprises,
a switch housing, a cam shaft mounted with a cam is housed within the switch housing,
cam followers loaded with spring having moveable contacts are housed within the switch housing, fixed contact strip having fixed contact are mounted within the switch housing, fixed contact strips are connected by a link,
wherein the cam can be swiveled between a first position and a second position to performs the ON /OFF function of the switch,
wherein two such switches assembled together with their cam shafts coupled together form a one stage two pole switch characterized in that,
A ONE stage TWO poles disconnecting and earthing device comprises,
a switch housing,
a cam shaft mounted with cam is housed within the switch housing cam followers carrying the moving contacts which are housed within the switch housing are loaded with spring,
a first fixed contact strip having a first fixed contact having second fixed contact and a third fixed contact having fourth fixed contact having fifth fixed contact having sixth fixed contact and seventh fixed contact having eighth fixed contact,
wherein the cam followers 203, 204 carrying the fixed contacts 203a, 203b, 204a, 204b, a first fixed contact having second fixed contact and a third fixed contact having fourth fixed contact forms the first pole,
wherein cam followers carrying the moving contacts having fifth fixed contact having sixth fixed contact and seventh fixed contact having eighth fixed contact form the second pole,
wherein the cam can be swiveled between a first position and a second position,
wherein in the first position of the cam the moving contacts are in contact with the fixed contacts and the moving contacts are disconnected the fixed contacts and
wherein in the second position of the position of the cam the moving contacts are in contact with the fixed contacts and the moving contacts are disconnected from the fixed contacts.

A disconnecting and earthing device for high voltage electrical applications comprises,
a switch housing, a cam shaft mounted with a cam is housed within the switch housing, cam followers loaded with spring having moveable contacts are housed within the switch housing, fixed contact strip having fixed contact are mounted within the switch housing, fixed contact strips are connected by a link,
wherein the cam can be swiveled between a first position and a second position to performs the ON /OFF function of the switch,
wherein two such switches assembled together with their cam shafts coupled together form a one stage two pole switch characterized in that,
a ONE stage TWO poles disconnecting and earthing device comprises,
a switch housing,
a cam shaft mounted with cam is housed within the switch housing,
cam followers carrying the moving contacts which are housed within the switch housing are loaded with spring,
a first fixed contact strip having a first fixed contact having second fixed contact having third fixed contact having fourth fixed contact having fifth fixed contact having sixth fixed contact having seventh fixed contact having eighth fixed contact are housed within the switch housing,
wherein the cam can be swiveled between a first position and a second position to performs the ON /OFF function of the switch,
wherein in the first position of the cam the moving contacts are in contact with the fixed contacts and the moving contacts are disconnected from the fixed contacts and
wherein in the second position of the position of the cam the moving contacts are in contact with the fixed contacts and the moving contacts are disconnected from the fixed contacts.
BREIF DESCRIPTION OF THE DRAWINGS
Figure 1: Schematically illustrates the switch known in the art.
Figure 2: Schematically illustrates the first embodiment of the disconnecting and earthing device according to the present invention.
Figure 3: Schematically illustrates the exploded view of one stage of the switch according to the present invention.
Figure 4: Schematically illustrates the second embodiment of the disconnecting and earthing device according to the present invention.
Figure 5: Schematically illustrates third embodiment of the disconnecting and earthing device according to the present invention.
Figure 5a: Schematically illustrates option 1 for connection of fixed contact strips.
Figure 5a: Schematically illustrates option 2 for connection of fixed contact strips.
Figure 6: Schematically illustrates the 4-pole disconnecting and earthing device assembly according to the present invention.
Figure 7: Schematically illustrates the 8-pole disconnecting and earthing device assembly according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING FIGURES
As shown in Figure 1, the disconnecting and earthing device known in the art comprises a switch housing (1) disposed to house the elements of the earthing device. A cam (2) is disposed to incorporate to and fro motion to a first cam follower (3) fitted with first moving contacts (3a) and second moving contact (3b). The cam (2) further incorporates to and fro motion to a second cam follower (4) fitted with third moving contacts (4a) and fourth moving contact (4b). The cam (2) is mounted on a cam shaft (6) and the cam followers (3, 4) are loaded with spring (5) to ensure that the cam follower (3, 4) is always in contact with the cam (2). The cam (2) incorporates to and fro motion to the cam follower (3, 4) carrying the moving contact (3a, 3b, 4a, 4b) according to the profile of the cam (2).
The cam (2) is fitted on the camshaft (6) at the required position and is mounted within the switch housing (1) such that the cam (2) can be swiveled between a first position and a second position. The switch housing (1) further houses first fixed contact strip (7), second contact strip (8), third contact strip (9) and fourth contact strip (10) which are fitted at predetermined location such a manner that the cam shaft (6) can be changed between the first position and the second position.
In the first position the cam (2) lifts the cam follower (3, 4) carrying the moving contacts (3a, 3b, 4a, 4b) towards engaged contacts (7a, 8a, 9a, 10a) such that the moving contacts (3a, 3b, 4a, 4b) engages with the fixed contacts (7a, 8a, 9a, 10a) and in this position the switch performs the ON function. The first fixed contact strip (7) and the second fixed contact strip (8) are connected by a first link (11).
In the second position the cam (2) lowers the cam follower (3, 4) carrying the moving contacts (3a, 3b, 4a, 4b) are shifted away from the fixed contacts (7a, 8a, 9a, 10a) such that the moving contacts (3a, 3b, 4a, 4b) disengages from the fixed contacts (7a, 8a, 9a, 10a) and in this position the switch performs the OFF function. For high voltage applications two such switches shown in Figure 1 are needed to be connected in tandem. A link mechanism connects both the switches. The terminals of both the switches are interconnected. The switch is operated with a handle which is fitted to the cam shaft (6) that extends outside the housing (1) for switching between the two positions namely ON and OFF. In ON position the power input to the first fixed contact strip (7) is transmitted to the fourth fixed contact (10). A link mechanism is used to connect both the switches and operated with a single handle.
The following embodiments describe the apparatus constructed according to present invention to meet the main objective of providing a two-pole disconnecting and earthing device suitable for high voltage application having all the elements contained within a single housing.
Figure 2 illustrates the first embodiment of the disconnecting and earthing device according to the present invention suitable for high voltage applications (For example 1000V applications). As shown in Figure 2, the disconnecting and earthing device for high voltage application comprises a switch housing (101) disposed to house the elements of the switch. Cams (102) and (102’) are mounted on a cam shaft (114) one behind the other, the orientation of the Cams (102) and (102’) depends upon the end use.
The cam (102) disposed to incorporate to and fro motion to a first cam follower (103) fitted with first moving contacts (103a) and second moving contact (103b). The cam (102) incorporates to and fro motion to a third cam follower (105) fitted with third moving contacts (105a) and fourth moving contact (105b).
The cam (102’) incorporates to and fro motion to a second cam follower (104) fitted with fifth moving contacts (104a) and sixth moving contact (104b). The cam (102) further disposed to incorporate to and fro motion to fourth cam follower (106) fitted with seventh moving contact (106a) and eighth moving contact (106b).
The cam followers (103, 104, 105, 106) are loaded with spring (107, 107’, 107’’, 107’’’) to ensure that the cam follower (103, 104, 105, 106) are always in contact with the cam (102, 102’).
The cams (102, 102’) fitted on the camshaft (6) are mounted within the switch housing (101) such that the cams (102, 102’) can be swiveled between the first position and second position.
The switch housing (101) further houses
a first fixed contact strip (108) having a first fixed contact (108a),
a second fixed contact strip (109) having second fixed contact (109a),
a third fixed contact strip (110) having third fixed contact (110a) and fourth fixed contact (110b),
a fourth fixed contact strip (111) having fifth fixed contact (111a), a fifth fixed contact strip (112) having sixth fixed contact (112a),
a sixth fixed contact strip (113) having seventh fixed contact (113a) and eighth fixed contact (113b).
The fixed contact strips are fitted in the pre-determined location in the housing (101) such a manner by shifting the cam shaft (114) carrying the cams (102, 102’) the cam follower (103, 104, 105, 106) carrying the moving contacts (103a, 103b, 104a, 104b, 105a, 105b, 106a, 106b) are pushed towards or away from the fixed contacts (108a, 109a, 110a, 110b, 111a, 112a, 113a, 113b) such that the moving contacts engages/disengages with the fixed contacts.
The above arrangement is ONE stage having TWO poles, suitable for high voltage application. The cam followers 104, 105 carrying the fixed contacts 104a, 104b, 105a, 105b, the second fixed contact strip (109) having second fixed contact (109a), the third fixed contact strip (110) having third fixed contact (110a) and fourth fixed contact (110b), a fourth fixed contact strip (111) having fifth fixed contact (111a) forms the first pole.
The cam followers (103, 106) carrying the fixed contacts (103a, 103b, 106a, 106b), first fixed contact strip (108) having first contact (108a), a fifth fixed contact strip (112) having sixth fixed contact (112a), a sixth fixed contact strip (113) having seventh fixed contact (113a) and eighth fixed contact (113b) forms the second pole.
The cam (102, 102’) can be swiveled between the first position and a second position. In the first position of the cam (102, 102’) the moving contacts (103a, 103b, 106a, 106b) are connected to the fixed contacts (108a, 113b, 113a, 112a) and the moving contacts (104a, 104b, 105a, 105b) are disconnected from the fixed contacts (109a, 110a, 110b, 111a,).
In the second position of the cam (102, 102’) the moving contacts (104a, 104b, 105a, 105b) are in contact with the fixed contacts (109a, 110a, 110b, 111a,) and the moving contacts (103a, 103b, 106a, 106b) are disconnected from the fixed contacts (108a, 113b, 113a, 112a). By changing the orientation of the cam (102, 102’) the sequence of operation of the switch can be adopted according to the requirement.
Figure 4 illustrates the second embodiment of the disconnecting and earthing device according to present invention suitable for high voltage applications. The switch comprises a switch housing (201) disposed to house the elements of the switch. Cam (202) and (202’) are mounted on a cam shaft (214) one behind the other, the orientation of the Cam (202) and (202’) depends upon the end use.
The cam (202) disposed to incorporate to and fro motion to a first cam follower (203) fitted with first moving contacts (203a) and second moving contact (203b). The cam (202) also incorporates to and fro motion to a second cam follower (204) fitted with third moving contact (204a) and fourth moving contact (204b).
The cam (202’) incorporates to and fro motion to a third cam follower (205) fitted with third moving contact (205a) and fourth moving contact (205b). The cam (202’) also incorporates to and fro motion to fourth cam follower (206) fitted with seventh moving contact (206a) and eighth moving contact (206b).
The cam (202, 202’) are mounted on a cam shaft (214) and the cam followers (203, 204, 205, 206) are loaded with spring (207, 207’, 207’’ and 207’’’) to ensure that the cam follower (203, 204, 205, 206) are always in contact with the cam (202, 202’).
The cams (202, 202’) are fitted on the camshaft (214) at the required position and are mounted within the switch housing (201) such that the cams (202, 202’) can be swiveled between the first position and second position.
The switch housing (201) further houses
a first fixed contact strip (208) having a first fixed contact (208a),
a second fixed contact strip (209) having second fixed contact (209a) and a third fixed contact (209b),
a third fixed contact strip (210) having fourth fixed contact (210a),
a fourth fixed contact strip (211) having fifth fixed contact (211a),
a fifth fixed contact strip (212) having sixth fixed contact (212a) and seventh fixed contact (212b),
a sixth fixed contact strip (213) having eighth fixed contact (213a).
The fixed contact strips are fitted in the pre-determined location in the housing (201) such a manner by shifting the cam shaft (214) carrying the cams (202, 202’) the cam follower (203, 204, 205, 206) carrying the moving contacts (203a, 203b, 204a, 204b, 205a, 205b, 206a, 206b) are pushed towards or away from the fixed contacts (208a, 209a, 210a, 210b, 211a, 212a, 213a, 213b) such that the moving contacts engages/disengages with the fixed contacts.
The cam followers 203, 204 carrying the fixed contacts 203a, 203b, 204a, 204b, a first fixed contact (208a), a second fixed contact strip (209) having second fixed contact (209a) and a third fixed contact (209b), a third fixed contact strip (210) having fourth fixed contact (210a) forms the first pole.
The cam followers (205, 206) carrying the fixed contacts (205, 205b, 206a, 206b), a fourth fixed contact strip (211) having fifth fixed contact (211a), a fifth fixed contact strip (212) having sixth fixed contact (212a) and seventh fixed contact (212b), a sixth fixed contact strip (213) having eighth fixed contact (213a) form the second pole.
The cam (202, 202’) can be swiveled between the first position and a second position. In the first position of the cam (202, 202’) the moving contacts (203a, 203b, 204a, 204b) are in contact with the fixed contacts (208a, 209a, 209b, 210a) and the moving contacts (205a, 205b, 206a, 206b) are disconnected from the fixed contacts (211a, 212a, 212b, 213a,).
In the second position of the cam (202, 202’) the moving contacts (205a, 205b, 206a, 206b) are in contact with the fixed contacts (211a, 212a, 212b, 213a,) and the moving contacts (203a, 203b, 204a, 204b) are disconnected from the fixed contacts (208a, 209a, 209b, 210a).
The above arrangement is ONE stage having TWO poles, suitable for high voltage application for example 1000V applications. By changing the orientation of the cam (202, 202’) the sequence of operation of the switch can be adopted according to the requirement.
The embodiments illustrated above are for ONE stage having two poles and switches of required poles can be constructed by adding the stages. For 4 pole application according to the present invention 2 stages are required, comparing to the requirement of 4 stages in the prior art switches.
Figure 5 illustrates the third embodiment of the disconnecting and earthing device for high voltage application according to present invention. The switch comprises a switch housing (301) disposed to house the elements of the switch Cam (302) and (302’) are mounted on a cam shaft (316) one behind the other, the orientation of the Cam (302) and (302’) depends upon the end use.
The cam (302) disposed to incorporate to and fro motion to a first cam follower (303) fitted with first moving contacts (303a) and second moving contact (303b). The cam (302) also incorporates to and fro motion to a third cam follower (305) fitted with third moving contacts (305a) and fourth moving contact (305b).
The cam (302’) incorporates to and fro motion to a second cam follower (304) fitted with third moving contact (304a) and fourth moving contact (304b). The cam (302’) also incorporates to and fro motion to fourth cam follower (306) fitted with seventh moving contact (306a) and eighth moving contact (306b).
The cam (302, 302’) are mounted on a cam shaft (316) and the cam followers (303, 304, 305, 306) are loaded with spring (307, 307’, 307’’ and 307’’’) to ensure that the cam follower (303, 304, 305, 306) are always in contact with the cam (302, 302’).
The cams (302, 302’) are fitted on the camshaft (316) at the required position and are mounted within the switch housing (301) such that the cams (302, 302’) can be swiveled between the first position and second position.
The switch housing (301) further houses
a first fixed contact strip (308) having a first fixed contact (308a), a second fixed contact strip (309) having second fixed contact (309a), a third fixed contact strip (310) having third fixed contact (310a), a fourth fixed contact strip (311) having fourth fixed contact (311a),
a fifth fixed contact strip (312) having fifth fixed contact (312a)
a sixth fixed contact strip (313) having sixth fixed contact (313a).
a seventh fixed contact strip (314) having seventh fixed contact (314a).
an eighth fixed contact strip (315) having eighth fixed contact (315a).
The cam (302, 302’) can be swiveled between the first position and a second position to perform the ON /OFF function of the switch. In the first position of the cam (302, 302’) the moving contacts (304a, 304b, 306a, 306b) are in contact with the fixed contacts (310a, 311a, 314a, 315a) and the moving contacts (303a, 303b, 305a, 305b) are disconnected from the fixed contacts (308a, 309a, 312a, 313a)
In the second position of the cam (302, 302’) the moving contacts (303a, 303b, 305a, 305b) are in contact with the fixed contacts (308a, 309a, 312a, 313a) and the moving contacts (304a, 304b306a, 306b) are disconnected from the fixed contacts (310a, 311a, 314a, 315a).
In this embodiment the poles are formed by connecting the fixed contact strips.
Option 1: As shown in Figure 5a, a fixed contact strip 309 connected to fixed contact strip 312 and fixed contact strip 311 connected to fixed contact strip 314.
Option 2: As shown in Figure 5b, a fixed contact strip 310 connected to fixed contact strip 315 and fixed contact strip 313 connected to fixed contact strip 308.
By changing the orientation of the cam (302, 302’) the sequence of operation of the switch can be adopted according to the requirement.
Figure 6 illustrates a FOUR Pole switch constructed with 4 switches according to the invention as against 8 switches in the prior art.
Figure 7 illustrates an EIGHT Pole switch constructed with 8 switches according to the invention as against 16 switches in the prior art. ,CLAIMS:WE CLAIM:
1. A disconnecting and earthing device for high voltage electrical applications comprises:
a switch housing (1);
a cam shaft (6) mounted with a cam (2) is housed within the switch housing (1);
cam followers (3, 4) loaded with a spring (5) having moveable contacts (3a, 3b, 4a, 4b) are housed within the switch housing (1);
fixed contact strips (7, 8, 9, 10) having fixed contacts (7a, 8a, 9a, 10a) are mounted within the switch housing (1);
fixed contact strips (7, 9) are connected by a link (11);
wherein the cam (1) can be swiveled between a first position and a second position to performs the ON /OFF function of the switch,
wherein two such switches assembled together with their cam shafts coupled together form a ONE stage TWO pole switch characterized in that,
A ONE stage TWO pole disconnecting and earthing device comprises:
a switch housing (101);
a cam shaft (114) mounted with cam (102, 102’) is housed within the switch housing (101);
cam followers (103, 104, 105, 106) carrying the moving contacts (103a, 103b, 104a, 104b, 105a, 105b, 106a, 106b) which are housed within the switch housing (101) are loaded with spring (107, 107’, 107’’, 107’’’);
a first fixed contact strip (108) having a first fixed contact (108a), a second fixed contact strip (109) having second fixed contact (109a), a third fixed contact strip (110) having third fixed contact (110a) and fourth fixed contact (110b), a fourth fixed contact strip (111) having fifth fixed contact (111a), a fifth fixed contact strip (112) having sixth fixed contact (112a), a sixth fixed contact strip (113) having seventh fixed contact (113a) and eighth fixed contact (113b) are mounted within the switch housing (101);
wherein the cam followers (104, 105) carrying the fixed contacts (104a, 104b, 105a, 105b) the second fixed contact strip (109) having second fixed contact (109a), the third fixed contact strip (110) having third fixed contact (110a) and fourth fixed contact (110b), a fourth fixed contact strip (111) having fifth fixed contact (111a) forms the first pole,
wherein, the cam followers (103, 106) carrying the fixed contacts (103a, 103b, 106a, 106b), first fixed contact strip (108) having first contact (108a), a fifth fixed contact strip (112) having sixth fixed contact (112a), a sixth fixed contact strip (113) having seventh fixed contact (113a) and eighth fixed contact (113b) forms the second pole,
wherein the cam (102, 102’) can be swiveled between a first position and a second position,
wherein in the first position of the cam (102, 102’) the moving contacts (103a, 103b, 106a, 106b) are connected to the fixed contacts (108a, 113b, 113a, 112a) and the moving contacts (104a, 104b, 105a, 105b) are disconnected from the fixed contacts (109a, 110a, 110b, 111a,) and
wherein in the second position of the cam (102, 102’) the moving contacts (104a, 104b, 105a, 105b) are in contact with the fixed contacts (109a, 110a, 110b, 111a,) and the moving contacts (103a, 103b, 106a, 106b) are disconnected from the fixed contacts (108a, 113b, 113a, 112a).
2. A disconnecting and earthing device for high voltage electrical applications comprises:
a switch housing (1);
a cam shaft (6) mounted with a cam (2) is housed within the switch housing (1);
cam followers (3, 4) loaded with spring (5) having moveable contacts (3a, 3b, 4a, 4b) are housed within the switch housing (1);
fixed contact strip (7, 8, 9, 10) having fixed contact (7a 8a, 9a, 10a) are mounted within the switch housing (1);
fixed contact strips (7, 9) are connected by a link (11);
wherein the cam (1) can be swiveled between a first position and a second position to performs the ON /OFF function of the switch,
wherein two such switches assembled together with their cam shafts coupled together form a one stage two pole switch characterized in that,
A ONE stage TWO poles disconnecting and earthing device comprises:
a switch housing (201);
a cam shaft (214) mounted with cam (202, 202’) is housed within the switch housing (201) cam followers (203, 204, 205, 206) carrying the moving contacts (203a, 203b, 204a, 204b, 205a, 205b, 206a, 206b) which are housed within the switch housing (201) are loaded with spring (207, 207’, 207’’, 207’’’);
a first fixed contact strip (208) having a first fixed contact (208a), a second fixed contact strip (209) having second fixed contact (209a) and a third fixed contact (209b), a third fixed contact strip (210) having fourth fixed contact (210a), a fourth fixed contact strip (211) having fifth fixed contact (211a), a fifth fixed contact strip (212) having sixth fixed contact (212a) and seventh fixed contact (212b), a sixth fixed contact strip (213) having eighth fixed contact (213a);
wherein the cam followers 203, 204 carrying the fixed contacts 203a, 203b, 204a, 204b, a first fixed contact (208a), a second fixed contact strip (209) having second fixed contact (209a) and a third fixed contact (209b), a third fixed contact strip (210) having fourth fixed contact (210a) forms the first pole,
wherein cam followers (205, 206) carrying the moving contacts (205a, 205b, 206a, 206b), a fourth fixed contact strip (211) having fifth fixed contact (211a), a fifth fixed contact strip (212) having sixth fixed contact (212a) and seventh fixed contact (212b), a sixth fixed contact strip (213) having eighth fixed contact (213a) form the second pole,
wherein the cam (202, 202’) can be swiveled between a first position and a second position,
wherein in the first position of the cam (202, 202’) the moving contacts (203a, 203b, 204a, 204b) are in contact with the fixed contacts (208a, 209a, 209b, 210a) and the moving contacts (205a, 205b, 206a, 206b) are disconnected the fixed contacts (211a, 212a, 212b, 213a) and
wherein in the second position of the position of the cam (202, 202’) the moving contacts (205a, 205b, 206a, 206b) are in contact with the fixed contacts (211a, 212a, 212b, 213a) and the moving contacts (203a, 203b, 206a, 206b) are disconnected from the fixed contacts (208a, 223b, 223a, 222a).

3. A disconnecting and earthing device for high voltage electrical applications comprises:
a switch housing (2);
a cam shaft (6) mounted with a cam (2) is housed within the switch housing (2);
cam followers (3, 4) loaded with spring (5) having moveable contacts (3a, 3b, 4a, 4b) are housed within the switch housing (2);
fixed contact strip (7, 8, 9, 20) having fixed contact (7a 8a, 9a, 20a) are mounted within the switch housing (2);
fixed contact strips (7, 9) are connected by a link (22);
wherein the cam (2) can be swiveled between a first position and a second position to performs the ON /OFF function of the switch,
wherein two such switches assembled together with their cam shafts coupled together form a one stage two pole switch characterized in that,
a ONE stage TWO poles disconnecting and earthing device comprises:
a switch housing (301);
a cam shaft (316) mounted with cam (302, 302’) is housed within the switch housing (301);
cam followers (303, 304, 305, 306) carrying the moving contacts (303a, 303b, 304a, 304b, 305a, 305b, 306a, 306b) which are housed within the switch housing (302) are loaded with spring (307, 307’, 307’’, 307’’’);
a first fixed contact strip (308) having a first fixed contact (308a), a second fixed contact strip (309) having second fixed contact (309a), a third fixed contact strip (310) having third fixed contact (310a), a fourth fixed contact strip (311) having fourth fixed contact (311a), a fifth fixed contact strip (312) having fifth fixed contact (312a), a sixth fixed contact strip (313) having sixth fixed contact (313a), a seventh fixed contact strip (314) having seventh fixed contact (314a), a eighth fixed contact strip (315) having eighth fixed contact (315a) are housed within the switch housing (302);
wherein the cam (302, 302’) can be swiveled between a first position and a second position to performs the ON /OFF function of the switch,
wherein in the first position of the cam (302, 302’) the moving contacts (304a, 304b, 306a, 306b) are in contact with the fixed contacts (310a, 311a, 314a, 315a) and the moving contacts (303a, 303b, 305a, 305b) are disconnected from the fixed contacts (308a, 309a, 312a, 313a) and
wherein in the second position of the position of the cam (302, 302’) the moving contacts (303a, 303b, 305a, 305b) are in contact with the fixed contacts (308a, 309a, 312a, 313a) and the moving contacts (304a, 304b306a, 306b) are disconnected from the fixed contacts (310a, 311a, 314a, 315a).