DESC:FIELD OF THE INVENTION
The present invention relates generally to moulded case circuit breakers (MCCBs). This invention will be mainly used in all switchgear and specifically concern to Moulded case circuit breakers. MCCB using microprocessor based release with auxiliary accessory mounting or provisions could make use of the concept.

BACKGROUND OF THE INVENTION
In the known art it is generally known to couple to an MCCB one of the release units, for providing overload and short circuit protections such as
· Thermal- magnetic release
· Microprocessor based release
Those releases are mechanically coupled together and with the MCCB basic unit and are provided by actuating means for actuating the operation of the electrical device (for example opening or closing of a circuit or similar).
In the known art, for accounting trip of the MCCB, a Flux Shift Device is relayed from the microprocessor based release unit. It is also known that an Under-Voltage accessory and a Shunt trip accessories also used for tripping purposes. The under-voltage accessory trips the MCCB in the event of Voltage drop in the system. The Shunt accessory acts when it is remotely relayed to trip the circuit breaker.
In the known art where the complete dependence on FSD for trip action for crucial sensing and fault pulse generation from the release, the trip system has complete dependence on the FSD of the MCCB, the problem addressed by this art is improved reliability. Also for other fault conditions such as under-voltage, over-voltage, over-frequency and locked rotor in case of motor protection if embedded in the release for fault clearing, utilizing the FSD for trip action can wear away the trip life of the MCCB and reliability tends to decline with every trip event. This can cause critical failure such as during short circuit conditions.

OBJECTS OF THE INVENTION
One object of the invention is to overcome the disadvantages/drawbacks of the prior art.
A basic object of the present invention is to provide enhanced reliability in tripping of circuit breakers.
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.

According to an aspect of the present invention there is provided a microprocessor based release assembly for use in switchgears eliminating the need for any separate Under Voltage release, said assembly comprising:
a sensing module to sense various feedbacks from the Trip contact ensuring operation of the flux shift device (FSD) wherein said module selectively relays over current faults to FSD and other faults to the Shunt Trip unit.
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 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.
Figure 1 illustrates Embedded feature depiction
Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not been drawn to scale. For example the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure.
Throughout the drawings, it should be noted that like reference numerals are used to depict the same or similar elements, features and structures.

DETAILED DESCRIPTION OF THE PRESENT INVENTION
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.
Construction of the assembly mechanism of the present invention is explained with reference to the accompanying figures.
This feature shall be built as a part of the micro-processor based release with indispensable or factory mounted shunt, Trip alarm contact and Microprocessor based release.
The release feature is as follows: the Trip Alarm contact feedback and Auxiliary contact feedback are fed to the micro processor based release for processing. The release senses various faults and selectively relays over current faults to FSD and other faults to the Shunt Trip unit. In the case of failure in operation of FSD, the Shunt release is relayed with the “Trip” signal hence improving the otherwise complete dependency on the Flux Shift Device.
The features described above can be built into a separate module (externally/Internally) and can act as an extended feature for the already available microprocessor based systems operating independent of feedbacks from other accessories like Auxiliary and Trip Alarm contacts.
The scheme proposed here senses the feedback from the Trip contact, ensuring operation of FSD. In the event of failure of FSD, non-trip of the MCCB and for the other sense conditions Shunt accessory shall receive the command from the release to issue trip to the MCCB in case of non-critical faults such as Over voltage, under-voltage, over-frequency, under-frequency and Locked rotor conditions. This eliminates the need for any separate Under Voltage release and thus the space occupied within the chassis of the breaker. Redundancy for accounting MCCB to trip by the use of Shunt device improves the reliability of the system. ,CLAIMS:1. A microprocessor based release assembly for use in switchgears eliminating the need for any separate Under Voltage release, said assembly comprising:
a sensing module to sense various feedbacks from the Trip contact ensuring operation of the flux shift device (FSD) wherein said module selectively relays over current faults to FSD and other faults to the Shunt Trip unit.
2. Assembly as claimed in claim 1 wherein the assembly relays the shunt release with the trip signal.
3. Assembly as claimed in any of the preceding claims inbuilt in the said switchgears.
4. Assembly as claimed in any of the preceding claims optionally built in a separate module.