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: INTEGRATED FUSE HOLDER AND FUSE CONTACT SYSTEM IN SWITCH DISCONNECTOR FUSE
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 relates to an improved contact system in switch disconnector fuse. More particularly, the invention is concerned about an integrated fuse holder and fuse contact system in switch disconnector fuse.
BACKGROUND OF THE INVENTION
In Switch Disconnector fuses, the current path includes:-
1) Terminals
2) Moving contacts
3) Fuse contacts (Fixed Contacts)
4) Fuse holder
5) Fuse
When the isolator or switch disconnector fuse is in ON position, the current enters the incoming side through the terminals to the moving contacts. This current is then transferred to the fuse contacts, which are attached to the top housing of the switch. From here, it is transferred to the fuse holders and then to the fuse link. On the other side of the switch, the same 'components carry current to the outgoing side in reverse order.
The disadvantages of the existing contact system in switch disconnector fuses are such that number of current carrying components is more, power loss is high, temperature rise and material requirement is high.
Thus, there is a need to reduce the number of current carrying components, power loss, temperature rise and material requirement. So, the present inventors have developed an improved contact system for use in switch disconnector fuses. It would reduce the number of current carrying components, power loss, temperature rise and material requirement. The assembly/arrangement of the fuse

contact and fuse holder using hardware such as screws, nuts and washers is eliminated in the present invention.
OBJECTS OF THE INVENTION
An object of the present invention is to overcome the problems/disadvantages of the prior art.
One of the objects of the present invention is to provided an improved contact system in switch disconnector fuse.
Another object of the present invention is to provide an integrated arrangement adapted for reducing current carrying components, power loss, temperature rise and material required.
Yet another object of the present invention is to provide an integrated fuse holder and fuse contact system in switch disconnector fuse.
These and advantages of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.
SUMMARY OF THE INVENTION
According to one aspect of the present invention there is provided an improved contact system in switch disconnector fuse, said system comprising :
a fuse link;
atleast one moving contact means;
atleast one terminal means;
atleast one arrangement substantially positioned between the said fuse link
and moving contact means, said arrangement comprising:

an upper projection,
a lower projection,
a web means and
a slit means with a substantial curve/bend at one of the end;
wherein said web means connecting said upper and lower projection, said
upper and lower projection are substantially positioned opposite to each
other, said upper and lower projection each extending from the diametric
end of said web means and transverse to the web means to define a
substantially Z shaped modular structure, said slit means is connected to
the end of said lower projection, said end of lower projection means is
diametric to the connection between the web means and lower projection,
said web means is integrated with said slit projection.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to an improved contact system in switch disconnector fuse.
The system comprises a fuse link, atleast one moving contact means, atleast one terminal means, atleast one arrangement substantially positioned between the fuse link and moving contact means.
The arrangement comprises an upper projection, a lower projection, a web means and a slit means with a substantial curve/bend at one of the end.
The web means connecting said upper and lower projection and upper and lower projection are substantially positioned opposite to each other. The upper and lower projection each are extending from the diametric end of the web means and is transverse to the web means to define a substantially Z shaped modular structure.

The slit means is connected to the end of lower projection. The end of lower projection means is diametric to the connection between the web means and lower projection.
The web means is integrated with slit means. The web means comprises the fuse holder and the slit means comprises the fuse contact. The fuse holder is integrated to fuse contact by fine blanking and bending in one single press stroke.
The fuse holder is operatively bolted with said fuse link at the top of the arrangement defining a top joint. The fuse contact is operatively connected with the moving contact at the bottom of the arrangement defining a bottom joint. The arrangement is made of copper and like.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Other features as well as the advantages of the invention will be clear from the following description.
In the appended drawings:
Fig 1 illustrates the contact system.
Fig 2 illustrates current flow path of the integrated arrangement of the contact system.
Fig 3 illustrates an isometric view of integrated arrangement of the contact system.
Fig 4 illustrates a side view of integrated arrangement of the contact system.

DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
In the following detailed description, reference is made to the accompanying drawings that form a part hereof, and illustrate the best mode presently contemplated for carrying out the invention. Further functioning of the system has been discussed below to describe the way the system operates. However, such description should not be considered as any limitation of scope of the present unit. The structure thus conceived is susceptible of numerous modifications and variations, all the details may furthermore be replaced with elements having technical equivalence. In practice the materials and dimensions may be any according to the requirements, which will still be comprised within its true spirit.
According to the invention there is provided an integrated fuse holder and fuse contact system in switch disconnector fuse.
Figure 1 illustrates the contact system in switch disconnector fuse with the integrated arrangement. The integrated fuse holder and the fuse contact showing the moving contact and the fuse link and the terminals are depicted in fig 1. Moving contacts (1) ,Terminals (2) integrated fuse holder and fuse contact (3) and Fuse link (4).
The arrangement (3) having integrated fuse holder and fuse contact is made of copper. The arrangement is formed by the integration of fuse contact ( not shown in figure 1) and fuse holder ( not shown in figure 1) in a single component. The integrated arrangement is made by fine blanking and bending a single copper component with the same dimensions and thickness as the existing ones.
Presently, the fuse links (4) are bolted to the fuse holders at a joint. The moving contacts (1) slide and get connected to the fuse contacts at another joint. This way there is no change in the current path. As the dimensions and profile of the new component is similar to the earlier system, the current flow is not changed and takes a more direct route.

Figure 2 illustrates the integrated arrangement of the contact system that is in a characteristic "Z" shape. The path taken by the current is depicted in fig 2.
Figure 3 shows an isometric view of the integrated arrangement, which comprises of integrating two components of the existing current path-Fuse holder and fuse contacts into a single component. This way, by reducing the number of current carrying components, power loss, temperature rise and material required can also be reduced. An integrated fuse holder-fuse contact system is beneficial in reducing all of the above without affecting the performance of the switch.
The integrated fuse holder and fuse contact is made of copper. The arragement has two different components, namely-fuse contact (7) and fuse holder (6) integrated to from a single component as shown in figure 3 and 4. The integrated arrangement is made by fine blanking and bending a single copper component with the same dimensions and thickness as the existing ones.
Presently, the fuse links (4) are bolted to the fuse holders (6) at (5). The moving contacts (1) slide and get connected to the fuse contacts (7) at (8). This way there is no change in the current path. As the dimensions and profile of the new
component is similar to the earlier system, the current flow is not changed and takes a more direct route.
As the new component eliminates one joint, it will lead to reduction in temperature rise. This in turn will lead to a lesser power loss and a more efficient transfer of energy between the current carrying components.
ADVANTAGES OF THE INVENTION
1. Less power loss
2. Less number of components
3. More economic.
4. Decrease in temperature rise

5. More saving of assembly time. Features:
• Assembly of two different components indicates presence of a joint. This results in higher temperature rise and power loss.
• The use of hardware in the prior art implies that some time is taken to assemble it. Eliminating the hardware reduces the cycle time and will result in more number of components being assembled in the same time.
• This practice will also reduce the material involved and with it, the material cost.

WE CLAIM:
1. An improved contact system in switch disconnector fuse, said system comprising a fuse link;
atleast one moving contact means; atleast one terminal means;
atleast one arrangement substantially positioned between the said fuse link and moving contact means, said arrangement comprising : an upper projection, a lower projection, a web means and
a slit means with a substantial curve/bend at one of the end ; wherein said web means connecting said upper and lower projection, said upper and lower projection are substantially positioned opposite to each other, said upper and lower projection each extending from the diametric end of said web means and transverse to the web means to define a substantially Z shaped modular structure, said slit means is connected to the end of said lower projection, said end of lower projection means is diametric to the connection between the web means and lower projection, said web means is integrated with said slit projection.
2. System as claimed in claim 1 wherein said web means comprises fuse holder.
3. System as claimed in claim 1 wherein said slit means comprises fuse
contact.
4. System as claimed in claim 1 wherein said fuse holder is integrated to fuse
contact by fine blanking and bending in one single press strike.

5. System as claimed in claim 1 wherein said fuse holder is operatively bolted with said fuse link at the top of said arrangement defining a top joint.
6. System as claimed in claim 1 wherein said fuse contact is operatively connected with said moving contact at the bottom of said arrangement defining a bottom joint.
7. System as claimed in claim 1 wherein said arrangement is made of copper and like.
8. An improved contact system in switch disconnector fuse as herein substantially described and illustrated with the accompanying drawings.