FORM2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
1. Title of the invention: SELECTIVE CONTINUITY OF AUXILIARY CONTACTS IN COMPACT FEEDER OF MOTOR CONTROL CENTRE (MCC) SWITCHBOARD
2. Applicant(S);

(a) NAME : LARSEN & TOUBRO LIMITED
(b) NATIONALITY : An Indian Company.
(c) ADDRESS : L & T House, Ballard Estate, Mumbai 400 001,
State of Maharashtra, India
3. PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed:

FIELD OF THE INVENTION
The present invention generally relates to feeders in a Motor Control Centre. More particularly the present invention relates to an improved contact arrangement in a motor control centre feeder. It relates to Secondary Isolation Contact (SIC) of Fractional Width Feeders to avail control supply and to communicate the signal to external circuitry.
BACKGROUND OF THE INVENTION
There are two types of the switchboards used to distribute the generated power; Power Control Centre (PCC) and Motor Control Centre (MCC). Power Control Centre is the device which distributes the power to different Motor Control Centre (MCC) and Motor Control Centre (MCC) is the device which is used to distribute that power intelligently to different motor loads, lamp loads using feeders. Feeders are nothing but a semi enclosed housing consisting of chassis and door. These feeders are again classified as Full Width Modules and Fractional Modules depending on the sizes.
There are two types of contacts in each module; Power Supply Terminals and Control Supply Terminals. The function of Power Supply Terminals is to avail the power supply from the bus bar to switching device inside the module and function of Secondary Isolation Contacts (SICs) is to avail the control supply or auxiliary supply for the purposes of different testing of module.
Some of the prior arts in the present field of invention are as follows;
EP2462666A2 discloses a subunit is provided for a motor control center including an enclosure, a number of compartments, a plurality of power lines, and a number of covers for covering the compartments. The subunit includes a housing removably disposed within a corresponding one of the compartments, a plurality of electrical contacts movably coupled to the housing, and an actuating assembly for moving the electrical contacts into and out of electrical contact with the power lines. The subunit further includes at least one of a locking assembly, a panel assembly, and a secondary disconnect assembly. The locking assembly locks the position of the electrical contacts and restricts access to the actuating assembly. The

panel assembly is pivotable and translatable with respect to the subunit housing. The secondary disconnect assembly is independent from the actuating assembly in order that movement of the electrical contacts does not move the secondary disconnect assembly.
EP1770738A2 disclose a method and apparatus is disclosed for controlling the flow of electrical power. Specifically, there is provided an integrated electrical device that includes a mounting rail, a first contactor mounted on the mounting rail, a safety relay coupled to the first contactor; and a protective plate coupled to the safety relay. There is also provided a method of manufacturing an electrical device that includes coupling a first contactor to a mounting rail, coupling a safety relay coupled to the first contactor, and coupling a protective plate coupled to the safety relay to create the integrated electrical device.
US7688572 provides a system and method for connecting supply power to motor control components includes use of a motor control center subunit with moveable supply power contacts. After a motor control center subunit is secured into a motor control center compartment, the supply power contacts may be advanced to engage supply power buses. For disconnection, the supply power contacts may be retracted and isolated from the buses before physical removal of the subunit.
WO2011000838A1 provides a motor control centre for remotely powering and controlling electric motors, comprising a frame that can be inserted in a supporting structure and is associated with the following: an isolator provided with clamps for connection to a power supply network; a first rod for operating the isolator, associated with a first bushing suitable for coupling with means for operating the first rod; a circuit breaker electrically connected with the isolator and the respective electric motor; a second rod for operating the circuit breaker, associated with a second bushing suitable for coupling with means for operating the second rod . It further comprises blocking members for blocking the access of the operating means to the bushings and actuating means cooperating with the blocking members and designed to bring the blocking members into different positions to enable or disable coupling between the operating means and the bushings. The operating means comprise a single removable operating key that is at the disposal of the operator and can be coupled with the bushings.

In order to overcome the disadvantages associated with the prior arts, the present invention provides an improved contact arrangement in a motor control centre feeder.
OBJECT OF THE INVENTION
A primary object of the invention is to overcome the drawbacks/disadvantages of the prior arts.
Another object of the invention is to provide an improved contact arrangement in a motor control centre feeder
Another object of the invention is to provide a secondary isolation contact to avail the control supply and to communicate the signal to external circuitry.
Another object of the invention is to provide a secondary isolation contact in a Fractional Width Feeders module to avail control supply to external circuitry.
Another object of the invention is to provide a) Test + service SIC and b) only service SIC for different working conditions.
Another object of the invention is to provide a micro switch in the module as a limit switch to change the output terminals,
SUMMARY OF THE INVENTION
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.

One aspect of the present invention provides improved contact arrangement in a motor control centre feeder, said arrangement comprising a plurality of secondary isolating conductors adapted to avail control supply and communicate signal to external circuitry; a plurality of micro switches for changing output terminals provided with a micro switch assembly spacer means thereon; at least one pair of slider means joined with a coupler strip and bracket to hold said isolating conductors; a housing means for said isolating conductors; at least one coupling Bracket integrated to said slider means using a slider coupler; a plurality of spring means facilitating actuation of said micro switch; and at least one spring loaded strip in communication with a spring holding bracket.
In accordance with the present aspect of the invention there is provided secondary isolation contacts for use in fractional width feeder module of Motor control centre to avail control supply to external circuitry.
In accordance with another aspect, the invention provides two types of secondary isolation contacts a) Test + service SIC and b) only service SIC for different working conditions.
In accordance with another aspect of the invention there is provided an interface comprising contact arrangement for distribution of the supply from bus bar to module power contact and module to termination of contact by for feeding the supply to load.
In accordance with another aspect of the invention there is provided the operation of Interface that has all the counter parts of the SICs and Power Terminals of module.
In accordance with another aspect of the invention there is provided a first operating position when a handle is pushed forward from isolation position, said to be test position.
In accordance with another aspect of the invention there is provided a second operating position when handle is pushed from test position, said to be in service position.
In accordance with another aspect of the invention there is provided a third operating position when handle is pushed back from service position to test position.
In accordance with another aspect of the invention there is provided a fourth operating position when handle is pushed back from test position to isolation position.

In accordance with another aspect, the invention provides Service + Test SlCs are physically connected to Interface and micro switches remain inactive during test position.
In accordance with another aspect, the invention provides micro switches to be activated to shift their output to normally open terminal during service position
In accordance with another aspect, the invention provides Service + Test SICs which are connected to micro switches are de-activated electrically during service position.
In accordance with another aspect, the invention provides Only Test SICs which will be activated in test position only and deactivated in Service and Isolation Position.
In accordance with another aspect, the invention provides the micro switches to be deactivated to shift their output to normally close terminal when module operated back to test position from service position and make Service + Test SICs connected to micro switches active.
In accordance with another aspect, the invention provides the micro switches to remain inactive when module operated back to isolation position and make Service + Test SICs physically separated from interface.
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 DRAWINGS
The following drawings are illustrative of particular examples for enabling methods of the present invention, are descriptive of some of the methods, and are not intended to limit the scope of the invention. The drawings are not to scale (unless so stated) and are intended for use in conjunction with the explanations in the following detailed description.
FIG.l illustrates the block diagram of the power generation to switchboard
FIG.2 illustrates the different parts of a module.

FIG. 3 illustrates the comparison of the three positions in Old and New type draw out circuit breaker
FIG.4 illustrates the module in an isolation position
Fig. 5 illustrates the module in Test position
FIG.6 illustrates the module in Service position
FIG.7a illustrates the Test + Service type of Secondary Isolation contact
FIG.7b illustrates the only Service type of Secondary Isolation contact
FIG. 8 illustrates a micro switch used in the module
Fig.9 illustrates Provision of Test SIC in Fractional Width Module
FIG. 10 illustrates a band diagram gives the travel of the module from each position
FIG.1 la illustrates the module in service position with different components.
FIG.11b shows the different components to achieve additional Secondary Isolation contacts
FIG. 12a shows the slider used in module.
FIG. 12b shows the coupling bracket used in module. FIG. 12c shows the slider coupler used in module.
FIG.l 2d shows the springs used in module.
FIG.12e shows the spring loaded strip used in module.
FIG. 12f shows the spring holding bracket used in module.
FIG.12g shows the spring guide used in module. FIG. 12h shows the micro switches used in module.
FIG. 12 i shows the micro switch mounting brackets used in module.
FIG 12 j shows the micro switch mounting spacer used module.
FIG. 12 k shows the micro switch holding screws used in module.

FIG. 121 shows the slider binding strip used in test module.
FIG. 13 illustrates an arrangement showing provisions for additional secondary isolation contact
FIG. 14 illustrates an arrangement showing provisions for Test only secondary isolation contact
FIG. 15 illustrates an arrangement showing provisions for both additional and Test only secondary isolation contact
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 INVENTION
The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. 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 and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
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.
It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise.
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.
Accordingly in the present invention FIG.1 illustrates the block diagram of power generation to switch boards. This explains the various intermediate elements involved from the time of power generation and distribution to the end user.
FIG.2 illustrates the different parts of a module. The module comprising Secondary isolation contact bracket, a slider, a slider coupler, a chassis, a micro switch assembly, a door, a handle, and a moving secondary isolation contact housing
FIG.3 illustrates the comparison of the three positions in Old and New type module. This figure illustrates the difference in arrangement of interface, Fixed Secondary isolation contact, and moving Secondary isolation contact between the old type and new type module.
Improved contact arrangement in a motor control centre feeder comprises a plurality of secondary isolating conductors adapted to avail control supply and communicate signal to external circuitry. It further comprises a plurality of micro switches for changing output terminals provided with a micro switch assembly spacer means thereon.
There is provided at least one pair of slider means joined with a coupler strip and bracket to hold said isolating conductors. A housing means for said isolating conductors facilitates housing. There is provided at least one coupling Bracket integrated to said slider means using a slider coupler. Spring means facilitates actuation of said micro switch.
Spring loaded strip in communication with a spring holding bracket. Secondary isolating conductors availing control supply configured for conducting a plurality of testing of module.

Micro switches are substantially limit switches that gets activated after specific travel. Micro switches are placed substantially in a micro switch holding bracket means using a plurality of micro switch holding screw means. Isolating conductors provided with at least one spring guide means for substantially accurate movement. Isolation conductors and slider means are integrated using a slider binding strip.
OPERATION OF MODULE
Interface is a module which consists of contact arrangement and used for distribution of the supply from bus bar to respective module power contact and from respective module to customer termination where customer terminates his contact for feeding the supply to his load. Interface has all the counter parts of the SICs and Power Terminals of the module.
Initially the module is in Isolation position FIG.4. During the isolation of module SIC housing are physically separated from Interface. The service + test SICs are physically separated from interface. The power terminals are physically separated from Interface.
During the operation of module the handle of the module is pushed form the isolation position to test position FIG.5. During the test position the SIC housing gets engaged with Interface SIC housing partially. The Service + Test SICs make contact with interface. Power Terminals are physically separated from Interface.
The module is then operated from test position to another operating position called service position FIG.6. During the service position SIC housing gets engaged with Interface SIC housing fully. Service + Test SICs makes contact with interface. Also, Service only SICs have made contact with interface. Power Terminals have made contact with interface.
The module is then operated back from service to test position SIC housing gets engaged with interface SIC housing partially. Service + Test SICs makes contact with interface. Power Terminals are physically separated from Interface.
And when module is operated reversed from Test to Isolation position, SIC housing is physically separated from Interface. Service + Test SICs are physically separated from interface. Power Terminals are physically separated from Interface.

When module travels from Isolation position to Test position, Secondary Isolation contacts (SICs) travels along with. Two types of SICs are used in the module. A Service SIC + Test SIC (FIG. 7 (a)) and Only Service (FIG. 7 (b)). However Test Only SICs are also required for particular type of testing. This Test Only SICs cannot be provided in such normal arrangement.
Test only SICs can be overcome with the help of Micro switches FIG. 8. Micro switches used in the module are the limit switches which when gets activated after specific travel; changes the output terminals (normally close NC to normally open NO).
FIG.9 illustrates the provision of Test SIC in Fractional Width Module. The arrangement is set as two sliders joined with the help of one coupler strip and bracket (which holds SICs in right side of the module shown above). Service + Test SICs which are intended to be Test Only SICs are connected to Normally Close (NC) terminals of Micro switches through wires. Test Only SICs are SICs which makes the contact in only Test Position.
Module operation
When module is pushed from Isolation position to Test Position, the micro switches remains inactive. The Service + Test SICs (Including Test Only SICs) are physically connected to Interface.
When module travels from Test position to Service Position, meanwhile, micro switches get activated viz. micro switches shift their output to Normally Open (NO) terminal and travel in activated condition to service position. Thus, in this position, Service + Test SICs (Test Only SICs) which are connected to micro switches are de-activated electrically, having made contact physically.
When module is operated from Service to Test Position, exact reverse action of step b) occurs. Micro switches get de-activated viz. micro switches have shifted its output to Normally Close (NC) terminal. Thus, in this position, Service + Test SICs (Test Only SICs) which are connected to micro switches are activated having made contact physically.

When module is operated from Test to Isolation Position, Micro switches remains inactive. Service + Test SICs (Including Test Only SICs) are physically separated from Interface.
FIG. 11a illustrates the module in the service position. The module comprising slider (1), spring (4), spring loaded strip (5), spring holding bracket (6), spring guide (7), micro switches (8), micro switch holding bracket (9), micro switch assembly spacer (10), slider binding strip (11).
FIG.11b illustrates the different components added to achieve the additional SICs. The components comprising slider (1), slider coupler (2), SIC mounting bracket. FIG. 14 shows spring loaded assembly is used to achieve Test Only SICs.
Although the aspects herein are described with various specific aspects, it will be obvious for a person skilled in the art to practice the aspects herein with modifications. However, all such modifications are deemed to be within the scope of the claims.
It is also to be understood that the following claims are intended to cover all of the generic and specific features of the aspects described herein and all the statements of the scope of the aspects which as a matter of language might be said to fall there between.

WE CLAIM:
1. An improved contact arrangement in a motor control centre feeder, said arrangement
comprising:
a plurality of secondary isolating conductors adapted to avail control supply and
communicate signal to external circuitry;
a plurality of micro switches for changing output terminals provided with a micro
switch assembly spacer means thereon;
at least one pair of slider means joined with a coupler strip and bracket to hold said
isolating conductors;
a housing means for said isolating conductors;
at least one coupling Bracket integrated to said slider means using a slider coupler;
a plurality of spring means facilitating actuation of said micro switch; and
at least one spring loaded strip in communication with a spring holding bracket.
2. Contact arrangement as claimed in claim 1 wherein said secondary isolating conductors availing control supply configured for conducting a plurality of testing of module.
3. Contact arrangement as claimed in claim 1 wherein said micro switches are substantially limit switches that gets activated after specific travel.
4. Contact arrangement as claimed in claim 1 wherein said micro switches are placed substantially in a micro switch holding bracket means using a plurality of micro switch holding screw means.
5. Contact arrangement as claimed in claim 1 wherein said isolating conductors provided with at least one spring guide means for substantially accurate movement.
6. Contact arrangement as claimed in claim 1 wherein said isolation conductors and slider means integrated using a slider binding strip.

7. An improved contact arrangement in a motor control centre feeder as herein described and illustrated with reference to accompanying drawings.