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 ARRANGEMENT IN BREAKER FOR BETTER QUENCHING OF SHORT CIRCUIT CONDITION
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
The present invention relates generally to a circuit breaker and more particularly, the invention is concerned about an improved arrangement in circuit breaker for better quenching of short circuit condition.
BACKGROUND AND THE PRIOR ART
Circuit breaker protects the electrical system whenever there is a fault condition. The clearance of short circuit fault condition by circuit breaker depends upon three factors given below:
i. How fast the fault is sensed by the sensor. ii. How fast the mechanism responds to the input from actuator. iii. How fast the arc is moved into the arc chute chamber and quenched.
During fault condition, the damage caused to the electrical system is indentified by Pt let through in the system. The heavy energy going down the electrical system during fault depends on square of fault current level (I) and the time (t) for which the fault current persist in the system.
Some of the prior arts in related field of invention are as follows:
CN1835150 (A) provides an electrical apparatus having a prechamber space, an arc runner and a current limiting arc quenching device. The invention proposes an electrical service device, in particular line circuit breaker or motor circuit breaker, having a housing having connecting areas and connection means for the purpose of connecting busbars and/or connection lines on both end sides and, having at least one switching contact having a fixed and a movable contact piece an arc being produced

in an arc prechamber area between said fixed and movable contact pieces in the event of a disconnection. The arc enters a current-limiting arc-quenching device, in particular an arc splitter stack, via arc guide rails, at least one insulating plate being arranged at the edge of the arc-quenching device. The insulating plate is fixed to the end section of an arc guide rail by means of a fixing clip.
GB2063566 (A) provides electromagnetically and thermally responsive circuit-breaker has a trip electromagnet arranged so that its cone armature is attracted on heavy faults to strike a rocker so as to separate the contacts and release the operating mechanism which is also released when the bimetallic strip, heated by overload, acts on the rocker to open the contacts. An arc runner directs the arc into a chute having metal quenching strips 34. Adjacent similar circuit-breakers have interconnected handles and interconnecting insulators in their casings for connecting tripping shafts together.
GB1512828 (A) provides a current limiting automatic cut out device. A current-limiting automatic circuit breaker has series connected contact sets and in two separate arc-chambers and of different sizes, the larger chamber having means such as quenching plates for dividing the arc and the movable contacts are the forked ends of a bridge member. Fixed contact is connected to a terminal and fixed contact and its arc runner is connected to a terminal via a trip coil and thermal trip means.
Although the given prior arts provides for arc quenching but the time taken is long. Thus there is a need to provide an improved arrangement in circuit breaker adapted to reduce the arcing time that also helps to reduce the damage to the sensitive elements in circuit breaker like heater, bimetal and also the circuit breaker as a whole.

The present inventors have found an improved profile/structure of arc runner of circuit breaker that helps in reducing the arcing time. This in turn reduces the Ft let through and prevents severe damage to the system.
OBJECTS OF THE INVENTION
A basic object of the present invention is to overcome the disadvantages/drawbacks of the known art.
A basic object of the present invention is to provide an improved arrangement in circuit breaker for better quenching of short circuit condition.
Another object of the present invention is to provide an improved arrangement in Circuit Breaker which generates better blow out force on arc during short circuit condition.
Another object of the present invention is to provide an improved profile/structure of arc runner of circuit breaker that helps in reducing the arcing time.
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
According to one aspect of the present invention, there is provided an improved arrangement in circuit breaker for quenching of short circuit condition, said arrangement comprising:

atleast one arc runner, said arc runner having duality of limbs having a current
reversal profile and insulation means;
a first terminal; the said terminal connected to the said arc runner.through the current
reversal profile.
atleast one moving contact coming in vicinity of arc runner while opening.;
atleast one fix contact runner connected to a second terminal of breaker,;
wherein terminal potential obtained at the arc runner pulls an arc root from moving
contact to arc runner and the current reversal profile of the said arc runner develops
the blow out force (Lorentz force) on an arc.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
In the appended drawings:
Figures 1, 2 and 3 illustrate a unique arc runner profile.
Figure 4 illustrates a position of the arc runner in the switch.
Figure 5 illustrates a current direction while switch opens during fault condition.
Figure 6 illustrates an angle between the plasma and current flowing through arc runner.
DETAILED 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 Fig 1 where an improved arrangement in circuit breaker for better quenching of short circuit condition is shown.
Fig. 2 and 3 shows different views of the arc runner profile.
Fig. 4 shows the placement of the arc runner in the switch.
Fig. 5 shows the current direction while switch opens during fault condition. When the arc jumps from Moving Contact to the Arc Runner, the arc root gets initial high force towards arc chute chamber.
Fig. 6 shows an angle between the arc and the current flowing through arc runner.
The invented system is thus an improved arrangement in circuit breaker for better quenching of short circuit condition.
DETAILED DESCRIPTION OF THE INVENTION
Accordingly in the present invention, there is provided an improved arc runner profile for use in circuit breakers. The unique profile of the arc runner is shown in the figures 1, 2 and 3. The unique profile of the arc runner provides arc to move faster in the arc chute chamber. This provides in reducing the arcing time during fault which in turn reduces overall fault clearance time. The position of the arc runner in the switch is as shown in the figure 4.The parts tagged in the switch assembly, as shown in the figure

4, comprises an Arc Runner (1), Moving Contact (2), Fix Contact Runner (3), Arc Chute Chamber (4) and Arc Runner Insulation (5).
Figure 5 shows the current direction while switch opens during fault condition. When the arc jumps from Moving Contact (2) to the Arc Runner (1), the arc root gets initial high force towards arc chute chamber (4). This is due to the smaller angle maintained initially between the arc and the current flowing through the arc runner (1) which is achieved due to the unique arc runner profile. The profile of the arc runner is substantially u shapped. The terminal potential obtained at the arc runner pulls an arc root from moving contact to arc runner. Figure 6 shows the angle between the plasma and current flowing through arc runner.
As shown in figure 6, the downward current direction in limbl of arc runner also contributes to develop high force on plasma towards arc chute chamber. Because of current direction the flux density below an arc is more than the flux density above an arc resulting into the resultant force direction towards the arc chute chamber. This force due to current reversal is achieved due to unique profile of Arc Runner (1).
This invention describes an improved arc runner profile in circuit breaker for better quenching of short circuit condition. This is achieved by a profile of arc runner which generates better blow out force on arc during short circuit condition due to current reversal phenomenon.
ADVANTAGES OF THE INVENTION
1. It is easy to manufacture.
2. It requires less space in assembly.
3. It helps reduce the arcing time.
4. It reduces the damage caused to the electrical system during fault.

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 arrangement in circuit breaker for quenching of short circuit condition, said arrangement comprising:
atleast one arc runner, said arc runner having duality of limbs having a current reversal profile;
a first terminal; the said terminal connected to the said arc runner through the current reversal profile.
atleast one moving contact coming in vicinity of arc runner while opening.;
atleast one fix contact runner connected to a second terminal of breaker.;
wherein terminal potential obtained at the arc runner pulls an arc root from moving contact to arc runner and the current reversal profile of the said arc runner develops the blow out force (Lorentz force) on an arc.
2. Arrangement as claimed in claim 1 wherein said arc runner is adapted to provide arc root initial high force towards said arc chute chamber when arc jumps from said moving contact to said arc runner,
3. Arrangement as claimed in claim 1 wherein one limb of said arc runner allow downward movement of current developing high force on plasma towards said arc chute chamber due to current reversal.
4. Arrangement as claimed in claim 3 wherein said current reversal generating high blow out force on arc during short circuit condition.

5. Arrangement as claimed in claim 1 wherein said profile is substantially angularly u shaped such that the arc runner and the current maintains a small angle with each other initially.
6. Arrangement as claimed in claim 1 wherein said arc runner farther comprising an insulation means.
7. An improved arrangement in circuit breaker for better quenching of short circuit condition as herein described and illustrated with reference to the accompanying drawings.