FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION (See section 10; rule 13)
1. Title of the invention: IMPROVED DISCONNECTOR ASSEMBLY
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:

TECHNICAL FIELD OF THE INVENTION
This invention relates generally to the field of switch disconnectors. More particularly the present invention relates to an improved switch disconnector having duel termination facility. It may be used in installations such as Housing complex, Hotels, Hospitals and buildings etc.
BACKGROUND AND THE PRIOR ART
Disconnectors are widely used in electrical distribution and related applications for isolating the electrical apparatus like circuit breakers and transformers etc. the main disadvantage associated with the conventional disconnector is more space requirement for installing in panel and the cost goes higher due to extra material. Further, Duel termination facility and contact indication is not available. Additionally, there is difficulty for wiring and cabling in panel due to less space available.
Some of the prior arts associated with present invention are as follows:
WO2011147717 provides a switch disconnector having a main contact system comprising a switch disconnector stationary contact and a switch disconnector moving contact in order to form an isolating gap in a disconnected position and having a vacuum switching tube for arc quenching, whose design is simplified and compact, it is proposed that the vacuum switching tube be arranged in a fixed position, with a cam disk for movement of a moving contact connecting bolt of the vacuum switching tube being provided, which cam disk is mechanically coupled to the switch disconnector moving contact
KR20020018958 provides a disconnector which has high dielectric strength, and nevertheless is simple and compact, and can be produced cost-effectively. A disconnector comprises at least two isolating contacts, at least one isolating contact finger which is arranged such that it can be moved along an axis between the isolating contacts and which, when the disconnector is open, is arranged in the interior of one of the isolating contacts, a pressurized, electrically conductive encapsulation, and an insulation coating which is applied to part of the inside of the encapsulation. The insulation coating is applied without any gaps to the inside of the

encapsulation, at least in the region between the isolating contacts. At least one projection is provided on the insulation coating.
JP1235106 aims to make a large-current switch small-sized by fitting ring-shaped metals to axis portions of a blade respectively and connecting these metals with a flexible conductor group. The ring-shaped first metal is integrally fitted on the lower face of a conductor, the ring-shaped second metal facing it is integrally fitted to the upper face of a blade. A cylindrical conductor group expanded to the outside by weaving many flexible conductors cylindrically arranged to surround an axis into a net shape is provided. When the blade is rotated, a conductor group cylindrically arranged with many flexible conductors is twisted around the axis, and a current can be fed between the conductors on the fixed side and the blade. The defective contact or the like of a switch or a disconnector is prevented, the reliability is improved, the whole size for the large-current use can be made compact.
In view of the disadvantages associated with the conventional disconnectors and the cited prior arts there is a need of compact product which is user friendly. The present invention therefore provides an Electrical switch disconnector with compact design and cost effectiveness.
Present invention is adapted to accelerate up to 125A in one module. The size will be accommodated in less space hence compact in overall size and less in cost. Connection of wires and cables will be easier in the panels due to extra space available. It offers duel termination facility. Additionally it provides for contact indication. Present invention provides for an enhanced short time withstand performance that saves from breakdown, failure due to high spike of current and burning of internal/external parts.
OBJECTS OF THE INVENTION
A basic object of the present invention is to overcome the disadvantages/drawbacks of the known art.
Another object of the present invention is to provide an improved switch disconnector having duel termination facility.

Other object of the present invention is to provide a compact switch disconnector assembly.
Yet another object of the present invention is to provide for contact indication.
These and other advantages of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings.
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.
There is provided an improved switch disconnector assembly.
According to one aspect of the present invention, there is provided An improved disconnector assembly comprising a plurality of link means; a housing means; a plurality of knob means connected to said link means; a cover means; a pin means; at least one terminal screw; at least one fixed contact; at least one moving contact having a silver tip at two contact points; at least one contact carrier; at least one moving contact tip; at least one terminal means; at least one fixed contact tip; at least one spring means; wherein said contact carrier and said pin means internally engaged with said knob means; wherein said contact carrier and said spring means connected to said moving contact; wherein said knob means operatively connected to said moving contact thereby completing the current path.
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
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.
Reference is first invited to Figure 1 that illustrates the isometric view of the 4P complete assembly of Isolator depicting constructional features of the present invention that includes Link (1), Housing (2), Knob (3), Cover(4),
Figure 2 illustrates the front isometric view depicting constructional features of the present invention that includes Housing (2), Knob (3), U pin (5), Terminal screw(6), Fixed contact (7), Contact carrier(8), Moving contact tip (9), Terminal (10), Fixed contact tip (11), Back up spring (12).
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 the present invention provides an electrical switch disconnector having highest rating I25A in 17.5mm module with duel termination facility. This invention is adapted to accelerate up to 125A in one module. It provides for a compact overall size that can be accommodated in less space and in less in cost. Connections of wires and cables would be easier in the panels due to extra space available.
In one aspect of the invention there is provided a duel termination facility.
It is a mechanical switching device capable of making, and carrying currents under normal circuit conditions which may include specified operating conditions. In this design of switch disconnector the contact carrier and U pin is internally engaged with on off knob, then contact carrier and contact carrier spring is connected with moving contact & moving contact gets connected to fixed contact which has a silver tip at two contact points to complete the current path.
When we operate the on off knob to switch on the product, internal linkages gets operated and only moving contact touches to fixed contact. This moving contact has a silver tip at two contact point to complete the current path. Back up spring is provided with contact carrier to make separate contacts quickly while switching off the switch disconnector.

It is a new product in one module (17.5mm) having duel termination capacity. The different elements used along with their reference numerals are as under:
Link means (1) Housing means (2) Knob means (3) Cover means (4) Pin means (5) Terminal screw (6) Fixed contact (7) Contact carrier (8) Moving contact tip (9) Terminal (10) Fixed contact tip (11) Back up spring (12)
Advantages:
1. Highest rating 125A in 17.5mm module.
2. Compact in overall size.
3. Accommodate less space in panels as compare to available.
4. Less in cost.
5. Connections of wires and cables will be easier in the panels due to extra space available.
6. Duel termination facility available to customer.
7. Aesthetically good and this gives contact indication.

Although the embodiments herein are described with various specific embodiments, it will be obvious for a person skilled in the art to practice the embodiments herein with modifications. However, all such modifications are deemed to be within the scope of the invention.
It is also to be understood that the description is intended to cover all of the generic and specific features of the embodiments described herein and all the statements of the scope of the embodiments which as a matter of language might be said to fall there between.

WE CLAIM:
1. An improved disconnector assembly comprising:
a plurality of link means;
a housing means;
a plurality of knob means connected to said link means;
a cover means;
a pin means;
at least one terminal screw;
at least one fixed contact;
at least one moving contact having a silver tip at two contact points;
at least one contact carrier;
at least one moving contact tip;
at least one terminal means;
at least one fixed contact tip;
at least one spring means;
wherein said contact carrier and said pin means internally engaged with said knob means; wherein said contact carrier and said spring means connected to said moving contact; wherein said knob means operatively connected to said moving contact thereby completing the current path.
2. Assembly as claimed in claim 1 configured to provide contact indication.

3. Assembly as claimed in claim adapted to provide dual termination.
4. Assembly as claimed in claim 1 wherein said pin means is substantially U shaped.
5. Assembly as claimed in claim 1 wherein said knob means is substantially a switching ON/OFF knob means.
6. Assembly as claimed in claim I wherein said spring means connected to said contact carrier to make separate contacts quickly while switching off the switch disconnector.
7. An improved disconnector assembly as herein described and illustrated with reference to accompanying drawings.