FORM2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
1. Title of the invention. - SWITCH DISCONNECTOR
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 an electrical circuit protection device. More particularly the present invention relates to an improved switch disconnector assembly for distribution networks.
BACKGROUND AND THE PRIOR ART
Switch disconnectors form an integral component of the electrical circuit. It disconnects the electrical circuit during occurrence of a predetermined circuit condition. In conventional system Current products are available up to 63A. Termination size is available in 35 sq mm only. The conventional devices are bigger in overall size which takes more space and cost and operates in series path.
In contrast to this, the present invention will accelerate up to 100A in one module. The termination size will be available in 50 sq mm. Invented device is Compact in overall size which will be accommodated in less space as compare to existing and in less cost.
In conventional switch disconnector 63A Rating is in 17.5mm in one module. Also, only 35 sq. mm termination facility is provided in 17.5 mm module. However, in the present invention there is achieved 100A rating in 17.5 mm in one module and 50 sq. mm termination facility in 17.5 mm module. Conventional assembly is comparatively bigger for 100A size and not in 17.5 mm module. However, the present invention provides a compact size 85 x 75 x 17.5 mm in 1 module for 100A. Further, all conventional assemblies are in double break and more than 17.5 mm in 100A. But the present invention provides a single point Make and Break per pole in one module (17.5 mm) in 100A. Also it provides Parallel path gives distribution of current, it results into low heat on current carrying component.

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 a switch disconnector to be used in distribution networks.
Further object of the present invention is to provide a compact circuit device.
Yet another object of the present invention is to provide Parallel path to facilitate distribution of current that results into low heat on current carrying component.
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 electrical circuit protection device.

According to one aspect of the present invention, there is provided a switch disconnector to be used in distribution networks.
Other aspect of the present invention provides for parallel current path to give distribution of current that result into low heat on current carrying component.
Other aspect of the present invention provides a carrier link to dissipate the heat along
with braided wire for parallel path current distribution.
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.
FIG 1 illustrates the front view depicting constructional features of the present invention that includes Housing (1), ON OFF knob (2), Braided wire (Big) (3), Moving Contact (4), Braided wire (Small) (5), Carrier link (6), Terminal Screw (7), Silver tip holder (8), Silver tip (9), Terminal (10).
FIG 2 illustrates the isometric view depicting constructional features of the present invention that includes Housing (1), ON OFF knob (2), Termination Area (12).

FIG 3 illustrates the back view depicting constructional features of the present invention that includes ON OFF knob (2), Cover (11).
FIG 4(a) illustrates the top view depicting constructional features of the present invention that includes ON OFF knob (2), Terminal Screw (7).
FIG 4(b) illustrates the side view depicting constructional features of the present invention that includes ON OFF knob (2), Terminal Screw (7), Termination Area (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 in the present invention a Switch Disconnector is provided. Switch disconnector is having 100A with 50 sq mm termination in 1 module (17.5 mm). It may be used in installations such as Housing complex, Hotels, Hospitals and buildings etc.
A mechanical switching device which, in the open position, complies with the requirements specified for the isolating function. This invention will accelerate up to 100A in 1 module. Termination size will be available in 50 sq, mm. The device is Compact in overall size which will be accommodated in less space as compared to existing and in less cost. One point Make/Break gives simultaneous contact connections.

It is a mechanical switching device capable of making, and carrying currents under
normal circuit conditions which may include specified operating conditions.
Switch-disconnector units are to be used in distribution circuits and motor circuits of which the rated voltage does not exceed 500 V AC.
The purpose of the invention is to increase rating (Current carrying) in 1 module, smaller size. The device provides ease of termination due to 50 sq. mm termination capacity. Additionally, the invented device Saves space and cost due to compact
design.
The present invention comprises following constructional features: 1) Housing 2) ON OFF knob 3) Braided wire (Big) 4) Moving Contact 5) Terminal 6) Terminal Screw 7) Silver tip 8) Carrier link 9) Braided wire (Small) 10) Silver tip holder 11) Cover
Main features of the invention are as follows:
1) Highest rating 100A in 1 module (17.5 mm), compact size.
2) 50 sq. mm cable termination in 1 module which gives ease of termination.
3) Compact design saves space and cost.
4) Switch Disconnector 100A, single point Make and Break per pole in one module (17.5 mm)
The invention provides a switch disconnector assembly of 100A, single point Make/Break per pole in 1 module and Cable termination 50 sq. mm in 1 module.
This assembly is configured to accelerate approximately up to 1I00A in one module. The configuration/assembly of the components that results in acceleration of approximately up to 100a in one module are as provided below:

a) As per theoretical calculation, Minimum cross sectional area required is 5.62 sq.mm and 6.24 sq. mm is available. This is the factor which accelerates the design to withstand for 100A.
b) As per theoretical calculation, Repulsion force at contact point is 0.09 kg and 0.38 kg is available. This factor also accelerates the design to withstand for 100A.
Further, the assembly is having termination size of approximately 50 sq mm. Termination of cable or wire is done in the product at provided terminal area. As per standard for 100A rating product, 50 sq. mm cable size is recommended. In this design cable entry pocket size is 9mm x 8mm = 72 sq mm, thus we can comfortably assemble the 50 sq. mm wire in 81 sq mm area.
This assembly is having substantially Single point Make and Break per pole in one module thereby providing a robust connectivity at contact. Design of this switch disconnector is such that internally lock lever and connecting link is engaged with on off knob, then connecting link is connected with moving contact & moving contact gets connected to silver tip to complete the current path. When we operate the on off knob to switch on the product, internally linkages gets operated and only moving contact touches to tip. This moving contact has only one contact point to complete the current path.
ADVANTAGES:
1) Highest rating 100A in 1 module (17.5 mm), compact size - Carrier link and braided wire parallel path provides to boost highest rating.
2) 50 sq. mm cable termination in 1 module which gives ease of termination — Housing and cover designed such way that 50 sq mm termination of cable will accommodate freely.

3) Compact design saves space and cost - Due to compact design, cost automatically comes down by weight of materials and by saving space of panel.
4) Switch Disconnector 100A, single point Make and Break per pole in one module (17.5 mm) - Single point contact ensures make and break precisely which results even distribution of current on current carrying parts.
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 claims.
It is also to be understood that the following claims are 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 switch disconnector assembly for distribution networks, said assembly comprising:
a housing means to accommodate the components;
a knob means adapted to facilitate switching ON and OFF operation;
a plurality of braided wires of substantially different size;
at least one moving contact having a moving contact tip;
at least one fixed contact having a fixed contact tip;
at least one carrier link means to carry current;
at least one silver tip holder to hold silver tip in assembly;
a cover means to cover all parts which are accommodated by housing;
at least one arc runner contact means to carry arc during short circuit;
at least one terminal means fixed using a terminal Screw;
Wherein said carrier link means along with plurality of said braided wires forming a parallel path resulting in substantial distribution of current and providing low heat on current carrying component;
Wherein said knob means engaged to a lock lever and a connecting link; said connecting link together with said moving contact and said silver tip holder together defining a current path.

2. Assembly as claimed in claim 1 configured to accelerate approximately up to 100A in one module.
3. Assembly as claimed in claim 1 having termination size of approximately 50 sq mm.
4. Assembly as claimed in claim 1 having substantially single point make and break per pole in one module thereby providing a robust connectivity at
contact.
5. Assembly as claimed in claim 1 wherein said knob means is operatively connected to a plurality of internal linkages thereby allowing said moving contact to complete the current path on operating said knob means.
6. An improved switch disconnector assembly for distribution networks as herein described and illustrated with reference to accompanying drawings.