Claims:1. A switch disconnector mechanism (3) comprising:
a housing (7);
an auxiliary contact assembly (4) placed on top of the said housing (7);
a horizontal rotor assembly (9) placed in said housing (7), wherein said horizontal rotor assembly (9) comprising plurality of gear tooth (9a);
a mechanism spring assembly adapted to drive the horizontal rotor assembly (9);
vertical rotor (8) placed along the horizontal rotor assembly (9) in said housing (7) and adapted to be rotated to enable the mechanism to achieve any of the position from plurality of positions including an ON-position, an OFF position and a TEST position, wherein said vertical rotor (8) comprising: a test spring actuator (8a), an auxiliary contact actuator (8b), a vertical rotor stopper (8c), plurality of gear tooth (8d) adapted to get operatively engaged/disengaged with/from the plurality of gear tooth (9a);
a pair of leaf springs (13) placed in the housing (7), and adapted to hold the vertical rotor (8) and to exert a force on the test spring actuator (8a) during rotation of the vertical rotor (8) from the OFF-position to the TEST position.
2. The mechanism as claimed in claim 1, wherein said auxiliary contact assembly (4) comprises plurality of auxiliary contact terminals (16); a pair of micro switches (15); and a position indication means adapted to indicate the OFF, ON and TEST positions.

3. The mechanism as claimed in claim 1, wherein said test spring actuator (8a) comprises a pair of radially extending small projections located opposite to each other on circumference of the vertical rotor.

4. The mechanism as claimed in claim 1, wherein said auxiliary contact actuator (8b) comprises substantially elliptical shaped flanges on the circumference of the vertical rotor adapted to actuate said micro switches (15), which in turn actuate the auxiliary contacts terminals (16).

5. The mechanism as claimed in claim 1, wherein said vertical rotor stopper (8c) comprises a radially extending projection on the circumference of vertical rotor.

6. The mechanism as claimed in claim 1, wherein said mechanism spring assembly comprises a pair of spring means (11), a pair of spring arms (10) and a pair of spring rest pins (12) placed inside the said housing (7), wherein said each spring means (11) placed inside said each spring arm (10); one end of said each spring means (11) and said each spring arm (10) is connected to said spring rest pins (12); and other end of said each spring means (11) and said each spring arm (10) is connected to the horizontal rotor assembly (9).

7. The mechanism as claimed in claim 1, wherein the housing (7) comprises a vertical rotor stopper portion (7a) adapted to hold the vertical rotor stopper (8c) during rotation of the vertical rotor (8) from the OFF to TEST position and a test spring rest portion (7b) adapted to hold said leaf springs.

8. The mechanism as claimed in claims 1-7, wherein in the OFF-Position of the mechanism the gear tooth (8d) of the vertical rotor (8) remain in touch with the gear tooth (9a) of the horizontal rotor assembly (9), the test spring actuator (8a) abuts the test spring and the vertical rotor stopper (8c) remain away from said vertical rotor stopper portion (7a) of the housing (7).

9. The mechanism as claimed in claim 8, wherein in the ON-Position of the mechanism the gear tooth (8d) of the vertical rotor (8) remain fully engaged with the gear tooth (9a) of the horizontal rotor assembly (9).

10. The mechanism as claimed in claim 9, wherein during rotation of the vertical rotor (8) from the OFF to ON position, the gear tooth (8d) of the vertical rotor (8) drive the gear tooth (9a) of the horizontal rotor assembly (9) in clock-wise direction for a predefined angle of rotation.

11. The mechanism as claimed in claim 10, wherein during rotation of the vertical rotor from the ON to OFF position, the gear tooth (8d) of the vertical rotor (8) drive the gear tooth (9a) of the horizontal rotor assembly (9) in anti-clock-wise direction.

12. The mechanism as claimed in claim 11, wherein during rotation of the vertical rotor from the OFF to Test position, the vertical rotor gear tooth (8d) completely disengaged from horizontal rotor gear tooth (9a) and the test spring actuator (8a) remains in loaded condition because of the force exerted by the leaf springs (13).

13. The mechanism as claimed in claim 12, wherein in the TEST-Position of the mechanism the test spring actuator (8a) is in unloaded condition with the leaf springs (13) and the gear tooth (8d) of the vertical rotor (8) remain fully disengaged with the gear tooth (9a) of the horizontal rotor assembly (9).

14. The mechanism as claimed in claim 1, wherein the mechanism comprises an extended shaft (5) placed on top of the vertical rotor (8) and an extended handle connected to said extended shaft (5) and adapted to rotate the vertical rotor (8).

15. A multipole switch disconnector (1) comprising:
the switch disconnector mechanism as claimed in claims 1-14;
plurality of contact system poles (2) placed on both sides of the switch disconnector mechanism (3) and operatively connected to said mechanism (3).
, Description:TECHNICAL FIELD OF THE INVENTION

[001] The present subject matter described herein, in general, relates to switch disconnector. More particularly, the invention relates to the construction of test position in switch disconnector along with ON & OFF Positon for use in applications commercial, distribution, building segments and the like where need of electrical isolation and switching under load of inductive or resistive loads exists.

BACKGROUND OF THE INVENTION

[002] Switch disconnectors are capable of making, carrying and breaking currents under normal circuit conditions, which may include specified operating overload conditions and also carrying for specified time currents under specified abnormal circuit conditions such as those of short-circuit.

[003] Generally, switch disconnectors are used in commercial, distribution and building segments for isolating the downstream devices, for maintenance purpose. The switch disconnector having an OFF (O) position, wherein the Contact system pole of the switch disconnector is in open position and an ON (I) position, wherein the contact system pole of the switch disconnector is in closed position. The position of switch disconnector are changed by rotating the horizontal rotor of mechanism/actuator of the switch disconnector. For rotating the horizontal rotor, switch disconnector are provided with a vertical rotor having OFF & ON positons, which correspond to the OFF & ON position of the switch disconnector.
[004] Some of the switch disconnectors also have test position, wherein the poles of the switch disconnector is in open position, but the position of the auxiliary contacts corresponds to the ON-position of the switch disconnector.

[005] The present invention relates to a test position in switch disconnector along with ON & OFF Positon. With the help of this test position, the control circuit can be activated and verified without disturbing / activating main circuit. i.e.., this feature ensure that, verifying the proper functioning of the auxiliary contacts without actuating actual mechanism/Contact system. This is a reliable solution, because after installation in case the functionality of control circuit (with the help of auxiliary circuit) is required to be checked, the same can be verified, without turning ON the main supply and this will prevent the risks involved.

[006] The function of test position feature in the switch disconnector is shown in the table 1.

S. No. Switch Indication Main Contacts Position Auxiliary Contacts Positon
1 OFF (O) Not Actuated Not Actuated
2 ON (I) Actuated Actuated
3 Test (T) Not Actuated Actuated
TABLE 1
[007] For existing patents related to the construction of test position in switch disconnector, reference is made to US7368676B2, entitled “Switching Device”. The prior art discloses a switching device having a frame (housing), in which an actuator (vertical rotor) adapted to rotate a main shaft (horizontal rotor) of the switching device and rotatable around an axis of rotation, the actuator (vertical rotor) having a 0-position, I-position & dead center-position as shown in figure 22 (a-d). I-position located by a given angle (a6) in a first direction relative to the 0-position. The actuator (vertical rotor) also has a testing position and it is located by a predetermined angle (ß6) in second direction relative to the first direction.
[008] Reference is also made to CN203456327U, entitled “Drive mechanism of switching device”. The prior art discloses a drive mechanism of switch comprising a drive shaft (10, vertical rotor), a slider member (20) and an elastic drive assembly (40, spring assembly). The drive shaft (10) is circumferentially provided with a first drive part (12) and a second drive part (14). The slide member (20) has a first limiting part (22), a second limiting part (24) and a transmission part (26). The elastic drive assembly (40) can be connected with the slide member (30) and can generate an elastic recovery force which acts on the slide member (30) and prevents the slide member (30) from moving. If the drive shaft (10) is at a cutoff position (OFF position), the first drive part (12) is connected with the first limiting part (22) and the second drive part (14) is connected with the transmission part (26). If the drive shaft (10) is at a test position, the first drive part (12) is connected with the first limiting part (22) and second limiting part (24). If the drive shaft (10) rotates from the cutoff positon (OFF position) or the test position towards test positon (or) cutoff position, the first drive part (12) can overcome the elastic recovery force of the elastic drive assembly (40) and push the first limiting part (22) to drive the slide member (20) to move the slide direction. The drive mechanism of switch according to this prior art is shown in figures 23 (a-d).
[009] However, the existing technologies have the following drawbacks, which has been addressed by the present invention:
• In prior arts there is chance of wrong indication, during switching operation from ON to OFF, it may directly go to TEST position, without stopping at OFF position.
• In prior art, complex components like actuator & coil spring have been used to achieve Test position. Because of the use of complex components, product assembly is time consuming
• Also the use of complex components impact on product cost & manufacturing cost.
[0010] Accordingly, there is a dire need for an improved switch disconnector mechanism having a test position, wherein the feature of test position provides a means of verifying the system control circuit, with the help of auxiliary contact system, without disturbing/activating/turning ON the main circuit. This will in turn reduce the risk and increase the reliability.

SUMMARY OF THE INVENTION

[0011] The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an extensive overview of the present invention. It is not intended to identify the key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concept of the invention in a simplified form as a prelude to a more detailed description of the invention presented later.

[0012] An objective of the present invention is to provide a switch disconnector mechanism having a test position along with OFF & ON positons, wherein the feature of test position means of provides a means of verifying the system control circuit, with the help of auxiliary contact system, without disturbing/activating/turning ON the main circuit, thereby preventing the risks involved with main circuit.

[0013] Another objective of the present invention is to provide a multipole switch disconnector with test position.

[0014] Another objective of the present invention is to provide a switch disconnector mechanism having a test position, which is in-built feature in the mechanism, no external component is required.

[0015] Accordingly, in one aspect, the present invention discloses a switch disconnector mechanism comprising:
a housing;
an auxiliary contact assembly placed on top of the said housing;
a horizontal rotor assembly placed in said housing, wherein said horizontal rotor assembly comprising plurality of gear tooth;
a mechanism spring assembly adapted to drive the horizontal rotor assembly;
the vertical rotor placed along the horizontal rotor assembly in said housing and adapted to be rotated to enable the mechanism to achieve any of the position from plurality of positions including an ON-position, an OFF position and a TEST position, wherein said vertical rotor comprising: a test spring actuator, an auxiliary contact actuator, a vertical rotor stopper, plurality of gear tooth adapted to get operatively engaged/disengaged with/from the plurality of gear tooth;
a pair of leaf springs placed in the housing, and adapted to hold the vertical rotor and to exert a force on the test spring actuator during rotation of the vertical rotor from the OFF-position to the TEST position.
[0016] In one embodiment of the first aspect, the auxiliary contact assembly comprises plurality of auxiliary contact terminals); a pair of micro switches; and a position indication means adapted to indicate the OFF, ON & TEST positions.

[0017] In one embodiment of the first aspect, the test spring actuator comprises a pair of radially extending small projections located opposite to each other on circumference of the vertical rotor.

[0018] In one embodiment of the first aspect, the auxiliary contact actuator comprises substantially elliptical shaped flanges on the circumference of the vertical rotor adapted to actuate said micro switches, which in turn actuate the auxiliary contacts terminals.

[0019] In one embodiment of the first aspect, the vertical rotor stopper comprises a radially extending projection on the circumference of vertical rotor.

[0020] In one embodiment of the first aspect, the mechanism spring assembly comprises a pair of spring means, a pair of spring arms and a pair of spring rest pins placed inside the said housing, wherein said each spring means placed inside said each spring arm; one end of said each spring means and said each spring arm is connected to said spring rest pins ; and other end of said each spring means and said each spring arm is connected to the horizontal rotor assembly.

[0021] In one embodiment of the first aspect, the housing comprises a vertical rotor stopper portion adapted to hold the vertical rotor stopper during rotation of the vertical rotor from the OFF to TEST position and a test spring rest portion adapted to hold said leaf springs.

[0022] In one embodiment of the first aspect, in the OFF-Position of the mechanism the gear tooth of the vertical rotor remains in touch with the gear tooth of the horizontal rotor assemble, the test spring actuator abuts the test spring and the vertical rotor stopper remain away from said vertical rotor stopper portion of the housing.

[0023] In one embodiment of the first aspect, in the ON-Position of the mechanism the gear tooth of the vertical rotor remains fully engaged with the gear tooth of the horizontal rotor assembly.

[0024] In one embodiment of the first aspect, during rotation of the vertical rotor from the OFF to ON position, the gear tooth of the vertical rotor drive the gear tooth of the horizontal rotor assembly in clock-wise direction for a predefined angle of rotation.

[0025] In one embodiment of the first aspect, during rotation of the vertical rotor from the ON to OFF position, the gear tooth of the vertical rotor drives the gear tooth of the horizontal rotor assembly in anti-clock-wise direction.

[0026] In one embodiment of the first aspect, during rotation of the vertical rotor from the OFF to Test position, the vertical rotor gear tooth completely disengaged from horizontal rotor gear tooth and the test spring actuator remains in loaded condition because of the force exerted by the leaf springs.

[0027] In one embodiment of the first aspect, in the TEST-Position of the mechanism the test spring actuator is in unloaded condition with the leaf springs and the gear tooth (8d) of the vertical rotor remain fully disengaged with the gear tooth of the horizontal rotor assembly.

[0028] In one embodiment of the first aspect, the mechanism comprises an extended shaft placed on top of the vertical rotor and an extended handle connected to said extended shaft and adapted to rotate the vertical rotor.

[0029] In another aspect, the present invention discloses a multipole switch disconnector comprising:
the switch disconnector mechanism as described herein above;
plurality of contact system poles placed on both sides of the switch disconnector mechanism and operatively connected to said mechanism.

[0030] Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

[0031] The above and other aspects, features, and advantages of certain exemplary embodiments of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings in which:

[0032] Figure 1 shows the general view of the 4-pole center operated switch disconnector, according to the present invention.
[0033] Figure 2 shows the general view of the mechanism, according to the present invention.
[0034] Figure 3 shows the exploded view of the mechanism, according to the present invention.
[0035] Figure 4 shows the cross-sectional view of the mechanism in OFF position, according to the present invention.
[0036] Figure 5 shows the cross-sectional view of the mechanism in Dead-Centre position, during OFF to Test position, according to the present invention.
[0037] Figure 6 shows the cross-sectional view of the mechanism in Test position, according to the present invention.
[0038] Figure 7 shows the cross-sectional view of the vertical rotor & test springs of mechanism in OFF position, according to the present invention.
[0039] Figure 8 shows the cross-sectional view of the vertical rotor & test springs of mechanism in Dead-Centre position, during OFF to Test position, according to the present invention.
[0040] Figure 9 shows the cross-sectional view of the vertical rotor & test springs of mechanism in Test position, according to the present invention.
[0041] Figure 10 shows the cross-sectional view of the vertical rotor & mechanism housing of mechanism in OFF position, according to the present invention.
[0042] Figure 11 shows the cross-sectional view of the vertical rotor & mechanism housing of mechanism in Test position, according to the present invention.
[0043] Figure 12 shows the general view of vertical rotor, according to the present invention.
[0044] Figures 13a & 13b show the general view of the auxiliary contact assembly, according to the present invention.
[0045] Figure 14 shows the general view of test spring, according to the present invention.
[0046] Figure 15 shows the general view of mechanism housing, according to the present invention.
[0047] Figure 16 shows the Top view of the 4-Pole SD in OFF-Position, according to the present invention.
[0048] Figure 17 shows the Top view of the 4-Pole SD in Test-Position, according to the present invention.
[0049] Figure 18 shows the general view of horizontal rotor, according to the present invention.
[0050] Figure 19 shows the general view of the mechanism in OFF-Position, according to the present invention.
[0051] Figure 20 shows the general view of the mechanism in ON-Position, according to the present invention.
[0052] Figure 21 shows the general view of the mechanism in TEST-Position, according to the present invention.
[0053] Figure 22 shows schematic view of the operating mechanism of a switching device (a) in the 0 position; (b) with the control shaft turned along its free travel towards the I position; (c) in the I position; (d) in the testing position, according to one prior art.
[0054] Figure 23 shows (a) the exploded view of the drive mechanism of switching device; (b) schematic view of the drive mechanism in O-position; (c) schematic view of the drive mechanism in test-position; (d) general view of the drive mechanism of switching device, according to another prior art.

[0055] Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure. Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

[0056] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary.

[0057] Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

[0058] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.

[0059] It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.

[0060] By the term “substantially” it is meant that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide.

[0061] Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.

[0062] It should be emphasized that the term “comprises/comprising” when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.

[0063] In one implementation, the present invention discloses a switch disconnector mechanism having a test position along with OFF & ON positons. The feature of test position provides a means of verifying the system control circuit, with the help of auxiliary contact system, without disturbing/activating/turning ON the main circuit. This will in turn reduce the risk and increase the reliability and this is achieved by providing a unique test position feature in the Switch disconnector. This is in-built feature in the mechanism, No external component is required.

[0064] For the better understanding of this invention, reference is made to a preferred embodiment illustrated in greater depth in the accompanying figures and description herein below, further, in the following figures, the same reference numerals are used to identify the same components in various views/figures.

[0065] Figure 1 shows the general view of 4-pole center operated switch disconnector, which comprises of contact system poles (2), mechanism (3), auxiliary contact assembly (4), extended shaft (5) & extended handle (6). Switch shows OFF-position.

[0066] Figure 2 shows the general view of mechanism assembly (3), which comprises of mechanism housing (7), auxiliary contact assembly (4) and extended handle (6).

[0067] Figure 3 shows the exploded view of the mechanism assembly (3), which comprises auxiliary contact assembly (4), extended shaft (5), extended handle (6), mechanism housing (7), vertical rotor (8), horizontal assembly (9), spring arm (10), mechanism spring (11), spring rest (12) and test spring (13),

[0068] Figure 4 shows the cross-sectional view of the mechanism in OFF position, which comprises mechanism assembly (3), auxiliary contact assembly (4) and vertical rotor (8). Section I-I indicates the vertical rotor position (8a) with respective to test spring (13) in OFF-position of the mechanism. Similarly section H-H indicates the vertical rotor position (8b), which in turn actuates the micro switch (15) and section F-F indicates the vertical rotor position (8c) with respective to mechanism housing stoppage (7a).

[0069] Figure 5 shows the cross-sectional view of the mechanism in Dead-Centre position, during OFF to Test position, which comprises mechanism assembly (3), auxiliary contact assembly (4) and vertical rotor (8). Section I-I indicates the vertical rotor position (8a) with respective to test spring (13) at dead-center during OFF- Test position of the mechanism. Similarly section H-H indicates the vertical rotor position (8b), which in turn actuates the micro switch (15) and section F-F indicates the vertical rotor position (8c) with respective to mechanism housing stoppage (7a).

[0070] Figure 6 shows the cross-sectional view of the mechanism in Test position, which comprises mechanism assembly (3), auxiliary contact assembly (4) and vertical rotor (8). Section I-I indicates the vertical rotor position (8a) with respective to test spring (13) in Test-position of the mechanism. Similarly section H-H indicates the vertical rotor position (8b), which in turn actuates the micro switch (15) and section F-F indicates the vertical rotor position (8c) with respective to mechanism housing stoppage (7a).

[0071] Figure 7 shows the cross-sectional view of the vertical rotor (8) & test springs (13) of mechanism assembly (3) in OFF position, where the vertical rotor pip (8a) is in just touch position with test spring.

[0072] Figure 8 shows the cross-sectional view of the vertical rotor (8) & test springs (13) of mechanism assembly (3) in Dead-Centre position, during OFF to Test position, where the vertical rotor pip (8a) is in loaded condition with test spring.

[0073] Figure 9 shows the cross-sectional view of the vertical rotor (8) & test springs (13) of mechanism assembly (3) in Test position, where the vertical rotor pip (8a) is in unloaded condition with test spring.

[0074] Figure 10 shows the cross-sectional view of the vertical rotor (8) & mechanism housing (7) of mechanism assembly (3) in OFF position, where the vertical rotor portion (8c) is away from the mechanism housing stopper portion (7a).

[0075] Figure 11 shows the cross-sectional view of the vertical rotor & mechanism housing of mechanism in Test position, where the vertical rotor portion (8c) is in touch mechanism housing stopper portion (7a), i.e., this mechanism housing portion (7a) is acting like stopper for vertical rotor portion (8c), during OFF- TEST operation.

[0076] Figure 12 shows the general view of vertical rotor (8), it consisting of test spring actuator feature (8a), auxiliary contact actuator feature (8b) and V.R stopper in test position (8c)

[0077] Figure 13a & 13b shows the general view of the auxiliary contact assembly, where the assembly of auxiliary contact terminals (16) and micro switches (15) and also the representation of OFF, ON & TEST Positons is shown.

[0078] Figure 14 shows the general view of test spring.

[0079] Figure 15 shows the general view of mechanism housing, which comprises test spring rest portion (7a) and vertical rotor stopper in test position (7b).

[0080] Figure 16 shows the top view of the 4-Pole SD in OFF-Position, which comprises contact system pole (2), mechanism assembly (3), auxiliary contact assembly (4) and extended handle (6).

[0081] Figure 17 shows the Top view of the 4-Pole SD in Test-Position, which comprises contact system pole (2), mechanism assembly (3), auxiliary contact assembly (4) and extended handle (6).

[0082] Figure 18 shows the general view of horizontal rotor assembly (9), which comprises mainly horizontal gear (9a) & supporting pins.

[0083] Figure 19 shows the general view of the mechanism in OFF-Position, which represent the horizontal rotor & vertical rotor gear tooth engagement and position with respect each other. Here it is showing vertical rotor gear tooth (8d) is just touched the horizontal rotor gear tooth (9a).

[0084] Figure 20 shows the general view of the mechanism in ON-Position, which represent the horizontal rotor & vertical rotor gear tooth engagement and position with respect each other. Here it is showing vertical rotor gear tooth (8d) is fully engaged with the horizontal rotor gear tooth (9a).

[0085] Figure 21 shows the general view of the mechanism in TEST-Position, which represent the horizontal rotor & vertical rotor gear tooth engagement and position with respect each other. Here it is showing vertical rotor gear tooth (8d) is fully disengaged with the horizontal rotor gear tooth (9a).

[0086] In one exemplary implementation, the present invention discloses assembly Instructions of a 4-Pole switch disconnector with test position.
i. First take one mechanism housing (7) as a reference component, as shown in figures 2a and 2b.
ii. Place the horizontal rotor assembly (9) in mechanism housing (7).
iii. Place the vertical rotor (8) along the horizontal rotor assembly (9), in such a way that to match cam tooth arrangement.
iv. Place the spring rest pins (12) in the mechanism housing (7).
v. Place the mechanism spring (11) in spring arm (10).
vi. Place the one end of the spring (11) & spring arms (10) assembly in spring rest pins (12) and other end place in horizontal rotor assembly (9) as shown in figure 2b.
vii. Place the test springs (13) in the mechanism housing (7) in such a way that, it will hold the vertical rotor (8).
viii. Place the second mechanism housing (7) on top of this assembly to make mechanism assembly.
ix. Place the auxiliary contact assembly (4) on top of the above assembly to make mechanism assembly with auxiliary contact assembly.
x. Place the extended shaft assembly (5) on top of the vertical rotor (8), where square portion is provided.
xi. On top of this place the extended handle to make complete mechanism assembly for ready for operation.
xii. place the C.S poles left & right side of the mechanism to make 4-Pole Switch disconnector.

[0087] In one implementation, the present invention discloses working principle of the present invention:
i. In OFF-Position of the mechanism, the vertical rotor gear tooth (8d) is in touch with horizontal rotor gear tooth (9a) as shown in figure 19.
ii. During OFF to ON rotation, the vertical rotor gear tooth (8d) drives the horizontal rotor gear tooth (9a) in clock-wise direction, and it stops at particular rotation of angle as required as shown in figure 20.
iii. In ON-Position of the mechanism, the vertical rotor gear tooth (8d) is fully engaged with the horizontal rotor gear tooth (9a) as shown in figure 20.
iv. During ON to OFF rotation, the vertical rotor gear tooth (8d) drives the horizontal rotor gear tooth (9a) in anti-clock-wise direction, and it stops in OFF position as shown in figure. 4 & 19. Where vertical rotor pips (8a) stops on test spring (13), the test spring (13) is acts like load bearing member during ON-OFF and vertical rotor pips acts like stopper in OFF-position. At this particular position the vertical rotor & horizontal gear tooth engagement is in just touch position.
v. During OFF to Test rotation, the vertical rotor gear tooth (8d) completely disengaged from horizontal rotor gear tooth (9a), over here during this operation the vertical rotor pips (8a) has to overcome the test spring (13) force and at particular rotation of angle as shown in figure 21.

[0088] Some of the non-limiting advantages of the present invention are:
• Can achieve dead centre and two stable positions (OFF and TEST) by means of cam (Vertical rotor pips) and Leaf spring (test spring) arrangement.
• Cam (vertical rotor pip) is integral part of Main actuator (Vertical rotor) without addition of any new component.
• Driving force to reach either of the stable positions (OFF and TEST) is achieved by means of force exerted by leaf spring (test spring) on the cam (vertical rotor pip).
• Fixing of leaf spring (test spring) is achieved by means of slot in the mechanism housing. No additional component is used.
• Identical arrangements of cam (vertical rotor pips) and leaf springs (test springs) are located exactly opposite to each other (180° apart on the circumference of the actuator vertical rotor). This arrangement creates a couple force. This eliminates any axial force on the rotor bearing area; Improves life and performance of the bearing.
• Can achieve TEST position without disturbing main mechanism function.
• In this invention, a simple flexible member (test spring, i.e. Press part) is used to achieve the TEST function. Thereby reducing the manufacturing cost.
• In this invention, vertical rotor (8) completely disengaged from horizontal rotor (9) during OFF to TEST rotation and thereby ensuring that No disturbance to other components during this operation.
• In this invention, easy of manufacturing of component (Press part), easy of assemble of mechanism & easy of functioning of the mechanism are ensured.

[0089] Although a switch disconnector mechanism with test position have been described in language specific to structural features, it is to be understood that the embodiments disclosed in the above section are not necessarily limited to the specific methods or devices described herein. Rather, the specific features are disclosed as examples of implementations of the switch disconnector mechanism with test position.