FORM2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
1. Title of the invention. - FAULT FREE HIGH RATING MODULAR CONTACT
SYSTEM
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 a fault free high rating modular contact system. More particularly, the invention is concerned about a draw out type contact system having high current carrying capacity comprising a unique design such that no two phase conductors or phase conductors at different potentials or phase and ground conductors come into contact with each other ensuring fault free, safe and reliable system.
BACKGROUND OF THE INVENTION
Modular systems are known in the electrical industries for their use in electrical switch boards to secure operations in electrical equipments. Modular system are used in main and distribution boards, MCC panels, Marino panels, Draw-out panels, plug-in panels, distribution boards, control panels and the like.
At present draw-out panels are used all over the world for distribution of electrical energy with the highest possible personal safety and operational dependability. However, it has been found that in the currently available modular contact systems and draw-out panels the cables which are provided movement with the contacts. This generates stresses on terminals and results in high temperature rise, which in turn results in Hot Spots and leads to fire hazards.
Also some prior designs use insulation sleeves which may get damaged with time due to repetitive use and heat and industrial environment. These designs always have a risk of insulation failure or sleeve damage and posses a higher risk factor. Further it has been found that when sleeves get damaged, replacing the same is time consuming and need skilled personnel.
US 5,301,086 teaches a terminal barrier for use in an electrical distribution load canter having a housing defined by side walls upstanding from a back wall. Within the housing are input terminals connecting a service line to a main circuit breaker

and output terminals connected to a plurality of branch circuit breakers. The barrier is a generally flat, thin body positioned to separate the input terminals from the output terminals. The barrier includes interlocking elements for disengagingly connecting one end of the barrier to the side wall of the housing. The barrier also includes elements for fastening the opposite end of the barrier to the housing while simultaneously engaging the interlocking elements and supporting the barrier in a plane parallel to the back wall of the housing.
ft was not known from the prior art that different phase conductors at different potentials or phase and ground conductors can be prevented from coming in contact with each other by means of unique designing of barrier component designed to be movable with the terminal housing.
For the purpose of overcoming the short-comings of the prior art, there is provided a draw out type contact system having high current carrying capacity comprising a unique design such that no two phase conductors or phase conductors at different potentials or phase and ground conductors come into contact with each other ensuring faulty free, safety and reliability in the system.
The present inventors have found that a fault free modular contact system which would prevent two phase conductors or phase conductors at different potentials or phase and ground conductors to come in contact can be achieved by way of introducing a movable barrier component and overlapping it with modular terminal housings.
OBJECTS OF THE INVENTION
One object of the present invention is to overcome the disadvantages of the prior art.
Another object of the present invention is to provide a fault free modular contact system having high current carrying capacity.

Yet another object of the present invention is to provide a barrier component designed to be movable with modular contact housing.
Another object of the present invention is to ensure that no two phase conductors or phase conductors at different potentials or phase and ground conductors come into contact with each other ensuring fault free, safe and reliable system.
SUMMARY OF THE INVENTION
According to one aspect of the present invention there is provided a fault free modular contact system having high current carrying capacity for use in a single phase system and/or multi-phase system, said system comprising: module chasis means;
contact driving plate means being movably mounted on said chasis means; barrier component being movably fixed on said contact driving plate on each side; plurality of modular contact housings, said each housing being mounted on said movable barrier component such that movement of the contact driving plate correspondingly moves said modular contact housing and said each modular contact housing being adapted to secure power contact means for each of the phases; plurality of module terminal housings located on the chasis in a substantially vertical manner wherein said barrier component operatively overlaps with said modular terminal housing ; and
wherein said barrier means operatively engaged with contact driving plate means such that said barrier moves along with said contact driving plate means so as to ensure no two phase conductors or phase conductors at different potentials or phase and ground conductors come into contact with each other ensuring fault free, safe and reliable system.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Figure 1 illustrates rear view of the fault free high rating modular contact system.
Figure 2 illustrates front view of the fault free high rating modular contact system.
Figure 3 illustrates top view of the fault free high rating modular contact system.
Figure 4 illustrates a plane rear view of the fault free high rating modular contact
system.
Figures 5(a) and 5(b) illustrate isometric views of the barrier of the present invention.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
According to the present invention there is provided with a draw-out type contact system with a high current carrying capacity bands ranging from 250-400A, 400-630A and upto 800 ampere and/or above. This system can also be upgraded for higher current carrying capacities. The design of the system is such that no two phase conductors or phase conductors at different potentials or phase and ground conductors come in contact with each other making it a Fault Free System. The barrier (2) provided in the present invention, moves with the current carrying members and ensures the safety and reliability of the system. The Contact Driving Arrangement ensures travel of the contacts within desired limit. It also guides contacts to Vertical Busbars and terminals for proper engagement. The system ensures trouble-free termination of cables and links. As the system is modular it provides solutions for a large band of current ratings.
According to preferred embodiment of the invention, the invention is provided a fault free high rating modular contact system. Figures 1 illustrates a rear view of the fault free high rating modular contact system. As shown in figure 1, the system comprises Power Contacts (9) which are housed in Modular Contact Housing (3). Modular Contact Housings (3) are fixed on the Barrier component (2). Barrier component (2) is fixed on Contact Driving Plate (6) on each side and the barrier is sandwiched between the said contact driving plate and the modular contact housing. The barrier component comprises one or more slot profiles which are substantially U-shaped

and allow toaccess the terminals provided in the modular terminal housing. For each phase one Modular Contact Housing (3) assembly is used. Modular Terminal Housings (1) are fixed on Module Chesis / chasis (A) is shown also in figure 2. Slots are provided in Module Chesis / chasis (4) for fixing of Modular Terminal Housings (1). Support Plate (8) is used for fixing of Terminal (7) by means of hardware. Thickness of the Terminal (7) varies according to the current rating. The barrier component is operatively overlapped with the modular terminal housing which secures the phase conductors at different potentials so that they do not come in contact to each other. The design of the system is such that it uses the same Modular Terminal Housing (1) for all current ratings. For connection of Terminal (7) with Power Contacts (9), braids are braized on both the parts. Contact Driving Plate (6) is connected to mechanism and indirectly provides translation motion to Power Contacts (9). As shown in figure 3, Contact Driving Plate (6) is guided through Guide Pin (12) which is fixed to the Module Chesis / chasis (4). The guide pin (12) and guide slot (13) arrangement is also shown in figure 3. Internal cables or links are terminated on Terminal (7). Holes (5) are provided on Terminal (7) for fixing cables or links as shown in figure 1. Phase partition (10) and ground partitions (11) of a barrier (2) are shown in figure 5.
When an operator operates mechanism of the feeder then Contact Driving Plate (6) moves. Modular Contact Housing (3) also moves as it is fixed on Contact Driving Plate (6). Power Contact (9) also moves as it is housed in Modular Contact Housing (3). The Power Contact (9) gets engaged with Vertical Busbars and Customer Terminals and circuit gets completed. Similarly when operator moves back the mechanism the metallic member moves back to its original position and Power Contact (9) gets disengaged from the customer terminal. Guide Pin (12) guides Contact Driving Plate (6) all the time. In this process Barrier (2) moves with the Modular Contact Housing (3) and ensures that no two different potentials can see each other. This makes the system fault free.

ADVANTAGES OF THE INVENTION
1) Enhanced Reliability - The barriers moves with the contact and always provides separation between two adjacent phases and phase and ground.
2) Lower Overall Cost - The system is modular and only current carrying parts changes with change in rating band and hence results in reduction of total number of components and different processes which would have been used. Therefore such a design provides a large cost reduction.
3) Assembly Time Reduction - The design uses easy fixing methods and hence needs less time for assembly.
4) Fault Free System - The design of the system makes it a Fault Free System and enhances the reliability of the system.
The invention has been described in a preferred form only and many variations may be made in the invention which will still be comprised within its spirit. The invention is not limited to the details cited above. The terminals, power contacts, pins, barrier, plates and housing as stated do not limit the scope of the present invention. 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.
Modular Terminal Housings (1); Barrier (2) Modular Contact Housing (3; Module Chasis (4) Holes (5); Contact Driving Plate (6) Terminal (7); Support Plate (8) Power Contact (9); Phase partition (10) ground partitions (11); Guide Pin (12) guide slot (13)

We Claim
1. A fault free modular contact system having high current carrying capacity for
use in a single phase system and/or multi-phase system, said system
comprising:
module chasis means;
contact driving plate means being movably mounted on said chasis means;
barrier component being movably fixed on said contact driving plate on each
side;
plurality of modular contact housings, said each housing being mounted on
said movable barrier component such that movement of the contact driving
plate correspondingly moves said modular contact housing and said each
modular contact housing being adapted to secure power contact means for
each of the phases;
plurality of module terminal housings located on the chasis in a substantially
vertical manner wherein said barrier component operatively overlaps with
said modular terminal housing ; and
wherein said barrier means operatively engaged with contact driving plate
means such that said barrier moves along with said contact driving plate
means so as to ensure no two phase conductors or phase conductors at
different potentials or phase and ground conductors come into contact with
each other ensuring fault free, safe and reliable system.
2. System as claimed in claim 1, wherein said barrier component comprises ground partition means.
3. System as claimed in claims 1 and 2, wherein said barrier component further comprises phase partition means.

4. System as claimed in claims 1 to 3, wherein said barrier component comprises plural slots adapted for accessing the terminals provided in the modular terminal housing.
5. System as claimed in claim 4 wherein said slots are substantially U-shaped.
6. System as claimed in claim 1 further comprising plurality of guide pin means.
7. System as claimed in claim 1, wherein said module chasis means comprises plurality of slots.
8. System as claimed in any of the preceding clams adapted to be used for high current carrying capacity bands ranging from 250-400A, 400-630A and upto 800 ampere and/or above.
9. A fault free modular contact system having high current carrying capacity for use in a single phase system and/or multi-phase system as herein substantially described and illustrated with the accompanying drawings.