DESC:FIELD OF THE INVENTION
The present invention relates to contact system for circuit breakers. Particularly the present invention relates to molded case circuit breakers (MCCBs). More particularly the present invention relates to double holder Compression spring based double break contact system for circuit breakers.

BACKGROUND AND PRIOR ART OF THE INVENTION
Circuit breakers are used for switching and protection of electrical equipment’s. It consists mainly of current sensing means, mechanism and contact system. The contact system consists of a set of fixed contacts and a moving contact. During any fault (short circuit) in the line, the moving contact is opens up and clears the fault.
During ON condition, a set of springs provide contact force to maintain the moving contact in ON condition. Different arrangements of springs are followed currently for maintaining contact pressure.
Nowadays the contact system is made in such a way that the moving contact repels open during any fault in line due to electromagnetic forces. During this movement the electromagnetic force has to fully act against the springs providing contact pressure.
The different means of contact arrangement currently in use are shown in Fig.1
The main limitations of the prior arrangements are:
- Most of the configurations have a continuously opposing spring force against the electromagnetic repulsion force giving less opening speed. (There is no flip locking)
- Contact pressure for most of the configurations are provided by extension springs which are comparatively complex in construction and less accurate. Also no flip locking is possible in simple construction using extension springs.
- The absence of flip locking in many of the configurations can result in contact not remaining in the final repelled condition after the fault has been cleared and current comes to zero.
- Even in cases where flip locking has been proposed the holding arrangement of springs are made in ways which could bring instability in contacts and increased friction occurs.
- All the above drawbacks of conventional arrangements also translate into lesser contact opening during a fault which makes clearing higher faults difficult. ( If the contacts open more, more arc voltage is obtained which helps in easier fault clearance).

The present inventors found a dual holder based compression spring arrangement where the moving contact flips open during short circuit. The spring arrangement is in such a way that , for initial opening of contact system the spring force opposes the electromagnetic force and then after that aids the electromagnetic force.
This arrangement helps in an increased opening velocity, which in turn helps in better breaking.
The holder arrangement is in such a way that the module attains maximum stability and friction effect is minimal. Two different types of holders are proposed for use in this type of system.

OBJECTS OF THE INVENTION
One object of the present invention is to overcome the disadvantages / drawbacks of the prior art.
A basic object of the present invention is to provide a double holder Compression spring based double break contact system for circuit breakers.
Another object of the present invention is to provide a double holder based compression spring arrangement that can provide a flip locking based contact system with less frictional loss, good stability and high contact opening.
These and other 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
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.
In an aspect of the present invention, there is provided an arrangement for double break contact system in circuit breaker(s), said arrangement comprising:
a contact arrangement comprises a moving contact(s), and a fixed contact(s);
a rotating shaft;
an arc quenching chamber;
a spring arrangement comprises at least two compression spring and at least two spring holder(s);
wherein said compression spring connected between said spring holder(s) providing a contact force for maintaining a pressure between said moving contact (s) and said fixed contact(s) to facilitate a flip locking for said contact system.

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 DRAWING
Other features as well as the advantages of the invention will be clear from the following description.
In the appended drawing:
Figure 1 illustrates the different means of contact arrangement currently in use/prior art.
Figure 2 illustrates the MCCB contact system in ON condition.
Figure 3 illustrates the moving contact repelled position.
Figure 4 illustrates the arrangement of moving contact.
Figure 5 illustrates the arrangement of springs on the holder.
Figure 6 illustrates a different method of contact arrangement, which is possible in this configuration.
Figure 7 illustrates the fixed contact arrangement is also modified to have arrangement.

DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWING
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, present invention provides an arrangement for double break contact system in circuit breaker
Fig 2 shows the present MCCB contact system in ON condition. The current conduction happens through the fixed contact onto the moving contact and again to the second fixed contact.
The compression spring arranged between the holders provide the contact force required to maintain the pressure between moving and fixed contacts to desired levels.
The contacts are designed (as in most of present MCCBs) in such a way that during short circuit conditions, an electromagnetic force acts between the moving contact and the fixed contacts. This force rotates the moving contact and brings it to repelled position as shown in Fig.3
During this motion the holders rotate on pins mounted on the shaft. This arrangement provides easy rotation of holders and helps in channelizing the spring force exactly in the required direction. The moving contact is supported only by the holder arrangement. This enables moving contact to face minimal friction during movement.
The arrangement of moving contact is shown in Fig.4
This type of spring arrangement also enables the system to have a high contact opening than conventional systems.
The shaft construction is also much simplified in this arrangement as compared to conventional systems.
The arrangement of springs on the holder is shown in detail in Fig.5
A different method of contact arrangement which is possible in this configuration is shown in Fig.6.
This is simpler arrangement as compared to the above mentioned concept, but needs more space for implementation.
The fixed contact arrangement is also modified to have arrangement as shown in Fig.7.
This also helps in increasing the contact opening as compared to a conventional contact system.
The double holder based compression spring arrangement provides a flip locking based contact system with less frictional loss, good stability and high contact opening. ,CLAIMS:1. An arrangement for double break contact system in circuit breaker(s), the arrangement comprising:
a contact arrangement comprises a moving contact(s), and a fixed contact(s);
a rotating shaft;
an arc quenching chamber;
a spring arrangement comprises at least two compression spring and at least two spring holder(s);
wherein the compression spring connected between the spring holder(s) providing a contact force for maintaining a pressure between the moving contact (s) and the fixed contact(s) to facilitate a flip locking for the contact system.
2. The arrangement as claimed in claim 1, wherein the spring holder pivoted on the shaft of the circuit breaker.

3. The arrangement as claimed in claim 1, wherein an electromagnetic force acting between the moving contact(s) and the fixed contact(s) rotating the moving contact, thereby providing repel position of the moving contact, when the circuit breaker in a short circuit condition.

4. The arrangement as claimed in claim 3, wherein rotation of the moving contact facilitating rotation of the spring holder, therefore channelizing the spring force in requisite direction.
5. The arrangement as claimed in claim 1, wherein the moving contact(s) supported by the spring holder(s), therefore providing minimal friction during movement of the moving contact.

6. The arrangement as claimed in claim 1, wherein the fixed contact(s) having bend on contact surface structure , therefore increasing the contact opening in the contact system.