FORM2 THE PATENTS ACT, 1970 (39 of 1970) & The Patents Rules, 2003 COMPLETE SPECIFICATION (See section 10; rule 13) 1. Title of the invention. - HOT CALIBRATION FOR MCCB 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 circuit breakers. More particularly the present invention relates to improved release assembly for hot calibration of breakers and a method thereof. BACKGROUND AND THE PRIOR ART Circuit breaker is used to protect the device from overload & short circuit current. Circuit breakers like molded case circuit breaker (MCCB) can be functionally divided into three sub systems namely, Mechanism, Contact system & Release. Release part in MCCB is responsible to give the circuit break command to the MCCB. There are two kinds of releases available in market- • Thermo magnetic (TM) release and • Electronic release Both the release has to do the basic function of giving the circuit break command during overload & short circuit condition. Usually TM releases are used when cost is the concern. Electronic release delivers superior performance at a relatively higher cost. TM release can be further sub divided into two sub parts, namely - Thermal part & Magnetic part. This invention deals with the first sub part of TM release, that is, the thermal part. Overload condition in simple terms can be explained as high current (though not as high as short circuit current) that can hamper the well being of the system in use. The system is designed to carry a particular rated current for a period of time based on its duty cycle. If higher current (overload current) flows in the system for longer periods, then the system will not be able to dissipate the excess heat generated because of the overload and ultimately the system would break down. Calibration is actually a tedious and a cumbersome process. Much iteration is to be done to achieve the perfect operation. The iterations are intercepted with a cooling period during which the bimetal cools and comes back to the original condition and gets ready for the next iteration. Our invention is basically to reduce the number of iteration to one and hence reduce the calibration time drastically. Some of the prior arts in the present field of invention are as follows: US6486759 provides a molded case circuit breaker that includes a double headed calibration screw. The calibration screw has a first and second end with identical convex tip surfaces and screw driver engagement surfaces. The convex tip surface is suitable for engaging a bi-metal thermal overload element. The screw driver engagement surface is suitable for applying a screw driver to adjust the calibration screw position in order to adjust the deflection of the bimetal and calibrate the thermal overload protection. At least one calibration screw planar surface allows for improved sealant injection to permanently fix the screw position and associated calibration setting following adjustment. US6720856 provides a thermally compensated circuit breaker having a movable contact assembly which mounts a movable electrical contact for movement between open and closed contacts positions with a stationary electrical contact. The contacts are maintained in the closed circuits position by a latching mechanism which prevents opening of the contacts through an opening contacts force provided by a spring. A current carrying trip arm deflects upon sufficient I<2>R heating to transfer motion to the latch to separate the latch from the latch receiving catch to trip the circuit breaker. The trip arm is part of a pivotably mounted actuator assembly having a movable end portion spaced from the pivot disposed adjacent a motion transfer member. A calibration screw is located so that the longitudinal axis is in line with a movable end portion of the actuator assembly and the motion transfer member. In one embodiment the head of the calibration screw is captured in a slot in the free end of a calibration base attached to the trip arm so that deflection of the trip arm directly transfers motion to the motion transfer member and in another embodiment the calibration screw head is captured in a slot in the free end of the trip arm so that a bowing deflection of the trip arm causes a calibration base to which it is attached at an end thereof to rotate with the calibration base directly transferring motion to the motion transfer member. GB2473049 provides fixture that comprises means to measure resistance; a current generator; a timer and means Such as motor to adjust the calibration screw of a circuit breaker. The resistance of a main circuit path and the time taken to respond to a generated current can be measured; the measured parameters validated by a secure remote sever; and adjustment applied to the calibration screw, which can be secured by glue, heat or a plug in the screw aperture. The calibration screw can be adjusted using a motor and a rotary or linear encoder to determine revolutions of the screw; under the control of a controller such as personal computer using a program that transacts with the server. The time to interrupt can be measured across, and a programmed test current applied to, the line in and out terminals of the breaker. The breaker can be tested and calibrated during manufacture; then de-calibrated and rendered unusable by turning the calibration screw until its contacts open. The fixture may be used to authenticate the circuit protection devices by verifying measurements and serial numbers against parameters recorded in a database; to re-calibrate and activate it at the point of sale; and to identify counterfeit devices. Conventionally the operator pass current and heat up the heater and the bimetal deflects 'X -Ax' mm. The breaker does not trip within the given time limit. The operator allows the breaker to cool it for a period of time (varies from 20 to 45 minutes). The operator changes the position, in this case reduces the gap between the calibration screw and shaft so that the circuit breaks open within the desired time limit, of the calibration screw and puts it into test. The bimetal deflects 'X - Ay' mm. (where y