FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
1. TITLE OF THE INVENTION:
"An Electronic Trip Unit (ETU) With An Interactive Display System"
2. APPLICANT:
(a) NAME: Larsen & Toubro Limited
(b) NATIONALITY: Indian Company registered under the
provisions of the Companies Act-1956.
(c) ADDRESS: LARSEN & TOUBRO LIMITED,
L&T House, Ballard Estate, P. 0. Box: 278, Mumbai 400 001, India
3. PREAMBLE TO THE DESCRIPTION:
COMPLETE
The following specification particularly describes the invention and the manner in which it is to be performed.

AN ELECTRONIC TRIP UNIT (ETU) WITH AN INTERACTIVE
DISPLAY SYSTEM
FIELD OF INVENTION
The present invention relates to the field of Electronic Trip Unit (ETU) for circuit breakers. More particularly, the present invention relates to a self-diagnostic Electronic Trip Unit (ETU) for circuit breakers.
DEFINITION(S):
The term "Touch Screen" used in the specification refers to a screen that not only functions as an output device for displaying necessary data, information or instructions but also functions as an input device for feeding/ selecting data, information or instruction by a touch of the user.
BACKGROUND OF THE INVENTION
Generally, electrical faults such as short circuiting, overloading and earth faults in an electrical circuit or a power distribution network of a power distribution system may cause irreparable damage to the power distribution system. Further, such electrical faults may also cause fire hazards. To protect the power distribution system against such damages, a variety of safety devices such as fuses and circuit breakers are available. A circuit breaker is an automatically operated electrical switch that cuts off electrical flow to the remaining power distribution network or isolates the faulty power distribution network in an event of a possible electrical fault, such as short-circuit, overload, and earth faults, thereby protecting the power distribution system against damages caused by short-circuiting or overloading. The circuit breaker includes a trip unit, that may be an electro-mechanical trip unit or an electronic trip unit. The electronic trip unit is a programmable device which measures and times current flowing through the circuit breaker and initiates a trip signal to the circuit breaker when appropriate. More specifically, the electronic

trip unit detects fault conditions based on current and voltage measurements and issues a trip command to the circuit breaker. The circuit breaker in-turn, by interrupting the electrical continuity immediately discontinues electrical flow to the remaining power distribution network, thereby isolating the faulty power distribution network and protecting the remaining power distribution network against any further damage.The electronic trip unit is basically used to provide protection and control for circuit breaker under fault conditions. The electronic trip unit causes discontinuation of service of the circuit breaker in presence of a short circuit, or when the circuit breaker starts to operate in any abnormal manner that might cause damage or otherwise interfere with the operation of the rest of the electrical system of which the circuit breaker is a part of. The electronic trip unit may include an interface for facilitating the programming the electronic trip unit.
The conventionally used Electronic Trip Unit (ETU) fail to provide sufficient and accurate information/data regarding any electrical fault in the electrical circuit that caused tripping of the circuit breaker, i.e. if the tripping of the circuit breaker has occurred due to short circuiting, overload or earth faults. Further, the convention electronic trip units fail to intuitively capture information and display data related to electrical fault that caused tripping of the circuit breaker at the time of the tripping. Such data/information regarding nature and cause of the electrical fault may be useful for ensuring proper maintenance and safety of the power distribution system. As the exact nature of the electrical fault that caused the tripping of the circuit breaker is not known, the maintenance personal has to analyse various parameters associated with the electrical circuit and the circuit breaker for identifying the exact cause of the electrical fault before proceeding with the rectification of the electrical fault. More specifically, information such as nature of the electrical fault and reason of such electrical fault may be required for the timely rectification of the electrical fault. Even if certain electrical trip units may display information regarding tripping and faults causing the tripping, such information is insufficient, inaccurate and is generally displayed on a separate display unit that is remotely located from the electronic trip unit.

Further after identification of the electrical fault, the maintenance personnel is required to change and monitor the various operational parameters or settings associated with the electrical circuit and the circuit breaker, such as current, voltage and power for controlling operations of the circuit breaker and the electrical circuit for rectifying the electrical fault. All these operations are performed by programming the Electronic Trip Unit (ETU) by using an interface mounted on the Electronic Trip Unit (ETU). The conventional electronic trip units may utilize a separate Human Machine Interface (HMI) for programming the Electronic Trip Unit (ETU). In case of such separate Human Machine Interface (HMI) or interface configured on the electronic trip unit, the user has to navigate through different screens for programming the Electronic Trip Unit, and as such these systems are difficult to operate. Such Human Machine Interface (HMI) configured on the conventional electronic trip unit for programming the Electronic Trip Unit (ETU) may require the user to access different display screens and may cause confusion and undue delay. Further, such Human Machine Interface (HMI) configured on the conventional electronic trip unit is not properly controlled and are inaccurate and ineffective.
The programming of the Electronic Trip Unit (ETU) for rectification of the electrical fault is based on the data captured at the time of circuit breaker tripping, which is remotely available at the separate display devices. Furthermore, the data captured at the time of circuit breaker tripping and displayed at the remote display device as in the case of conventional Electronic Trip Unit (ETU) is required to be analyzed and monitored. Such configuration of the conventional Electronic Trip Unit (ETU) may force the maintenance personnel to shuffle between the Electronic Trip Unit (ETU) and the display device that displays the data captured at the time of the circuit breaker tripping, thereby causing a lot of inconvenience, confusion and chaos.

Accordingly, there is a need for an Electronic Trip Unit (ETU) for circuit breakers that not only facilitates identification and display of cause(s) of electrical fault(s) in an electrical circuit that caused tripping of the circuit breaker, but also facilitates the programming of the Electronic Trip Unit (ETU), thereby ensuring proper maintenance and safety of the electrical system. Further, there is a need for an Electronic Trip Unit (ETU) for circuit breakers that institutively captures information pertaining to tripping of the circuit breaker and spontaneously displays data for assisting maintenance personnel in quickly and conveniently identifying exact cause of the electrical failure that caused the tripping of the circuit breaker. Further, there is a need for an Electronic Trip Unit (ETU) that assists maintenance personal in analysing various parameters associated with the electrical circuit and the circuit breaker and identifying the exact cause of the electrical fault before proceeding with the rectification of the electrical fault. Furthermore, there is a need for an Electronic Trip Unit (ETU) that assists maintenance personal in timely rectification of the electrical fault. Further, there is a need for an Electronic Trip Unit (ETU) that facilitate changing of the various operational parameters associated with the electrical circuit and the circuit breaker, such as current, voltage and power for controlling operations of the circuit breaker and the electrical circuit for rectifying the electrical fault.
Further, there is a need for an Electronic Trip Unit (ETU) that is simple in construction, convenient to use and inexpensive. Still further, there is a need for an Electronic Trip Unit (ETU) that displays all data required for identifying the nature of the electrical fault on one screen. Still further, there is a need for an Electronic Trip Unit (ETU) that displays all data required for identifying the nature of the electrical fault in an easy to understand and readable format at one place. Further, there is a need for an Electronic Trip Unit (ETU) that enables the maintenance personnel to read al] data displayed thereon from a wider viewing angle. Furthermore, there is a need for an Electronic Trip Unit (ETU) provided with a display system configured thereon that can withstand shocks, vibrations, exposure to detrimental chemicals and other unfavourable environment conditions

and that is reliable, convenient to use and economical. Still further, there is a need for an Electronic Trip Unit (ETU) that is sturdy, does not fail and has longer service life. Further, there is a need for an Electronic Trip Unit (ETU) that may be easily retrofitted and used with any of the conventionally known circuit breakers.
OBJECTS OF THE INVENTION
Some of the objects of the present invention are described herein below:
It is an object of the present invention to ameliorate one or more problems of the
prior art or to at least provide a useful alternative.
An object of the present invention is to provide an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon, wherein the interactive display system not only facilitates identification and display of cause(s) of fault(s) in an electrical circuit that caused tripping of the circuit breaker, but also facilitates programming of the Electronic Trip Unit (ETU), thereby ensuring proper maintenance and safety of the electrical system.
Another object of the present invention is to provide an Electronic Trip Unit (ETU) that intuitively captures information pertaining to tripping of the circuit breaker and spontaneously displays data for assisting maintenance personnel in quickly and conveniently identifying exact cause of the electrical failure that caused the tripping of the circuit breaker.
Yet another object of the present invention is to provide an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that displays data regarding electrical fault(s) that caused circuit breaker tripping, on one screen, thereby imparting self diagnostic characteristics to the Electronic Trip Unit (ETU) of the circuit breaker.

Still another object of the present invention is to provide an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that displays all data regarding an electrical fauit(s) that caused circuit breaker tripping on one screen, thereby eliminating the need to navigate to different screens for accessing different set of information/data.
Yet another object of the present invention is to provide an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that assists the maintenance personnel to timely rectify the electrical fault by providing necessary information to the maintenance personnel in an easy to understand and readable format.
Still another object of the present invention is to provide an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that enables the maintenance personnel to read the data pertaining to the electrical faults displayed thereon from a wider viewing angle.
Another object of the present invention is to provide an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that assists maintenance personal in analysing and monitoring various parameters associated with the electrical circuit and the circuit breaker and identifying the exact cause of the electrical fault before proceeding with the rectification of the electrical fault.
Yet another object of the present invention is to provide an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that is reliable.
Still another object of the present invention is to provide an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that facilitate changing of the various operational parameters associated with the

electrical circuit and the circuit breaker, such as current, voltage and power for controlling operations of the circuit breaker and the electrical circuit for rectifying the electrical fault.
Another object of the present invention is to provide an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that is convenient to use.
Still another object of the present invention is to provide an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that is simple in construction, convenient to use and inexpensive.
Yet another object of the present invention is to provide an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that can withstand shocks, vibrations, exposure to detrimental chemicals and other unfavourable environment conditions.
Another object of the present invention is to provide an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that is sturdy, does not fail frequently and has longer service life.
Still another object of the present invention is to provide an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that may be easily retrofitted and used with any of the conventionally known circuit breakers.
Yet another object of the present invention is to provide an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that displays useful data required for ensuring proper maintenance and safety of the power distribution system.

SUMMARY OF THE INVENTION
An Electronic Trip Unit (ETU) for a circuit breaker is disclosed in accordance with an embodiment of the present disclosure. The Electronic Trip Unit (ETU) includes an interactive display system configured thereon, wherein the interactive display system intuitively displays data generated using information captured during circuit breaker tripping or pickup, thereby facilitating identifying of fault(s) in an electrical system that caused tripping of the circuit breaker. The interactive display system further receives inputs and instructions for programming the Electronic Trip Unit (ETU).
Typically, the interactive display system is a touch screen that displays a fault osoillograph generated using information captured during circuit breaker tripping.
Generally, the interactive display system is a. touch screen that receives instructions for changing operational parameters associated with the circuit breaker for controlling operation thereof based on electrical fault(s) detected, thereby facilitating monitoring, analyzing of different parameters of the electrical system and ensuring proper maintenance and safety of the electrical system.
Typically, the interactive display, system is a touch screen based Liquid Crystal Display (LCD).
Alternatively, the interactive display system is a touch screen based (Organic Light Emitting Diodes) OLED display device.
In accordance with another embodiment, the interactive display system is a touch screen based Thin Film Transistor (TFT) display screen.
BRIEF DESCRIPTION OF THE DRAWING

Figure 1 illustrates a schematic representation of an interactive display system displaying a fault oscillograph generated by using information captured during circuit breaker tripping in accordance with an embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The invention will now be described with reference to the accompanying drawing which does not limit the scope and ambit of the invention. The description provided is purely by way of example and illustration.
The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

A circuit breaker is an automatically operated electrical switch that cuts off electrical flow to the remaining power distribution network or isolates the faulty power distribution network in an event of a possible electrical fault, such as short-circuit, overload, and earth faults, thereby protecting the power distribution system against damages caused by short-circuiting or overloading. The circuit breaker includes an electronic trip unit that is a programmable device which measures and times current flowing through the circuit breaker and initiates a trip signal to the circuit breaker when appropriate. More specifically, the electronic trip unit causes discontinuation of service of the circuit breaker in presence of a short circuit, or when the circuit breaker starts to operate in any abnormal manner that might cause damage or otherwise interfere with the effective operation of the rest of the electrical system of which the circuit breaker is a part of.
The conventionally used Electronic Trip Unit (ETU) fail to provide sufficient and accurate information/data regarding any electrical fault in the electrical circuit that caused tripping of the circuit breaker, i.e. if the tripping of the circuit breaker has occurred due to short circuiting, overload or earth faults. Further, the convention electronic trip units fail to intuitively capture information and display data related to electrical fault that caused tripping of the circuit breaker at the time of the tripping. Such data/information regarding nature and cause of the electrical fault may be useful for ensuring proper maintenance and safety of the power distribution system. As the exact nature of the electrical fault that caused the tripping of the circuit breaker is not known, the maintenance personal has to analyse various parameters associated with the electrical circuit and the circuit breaker for identifying the exact cause of the electrical fault before proceeding with the rectification of the electrical fault. More specifically, information such as nature of the electrical fault and reason of such electrical fault may be required for the timely rectification of the electrical fault. Even if certain electrical trip units may display information regarding tripping and faults causing the tripping, such information is insufficient, inaccurate and is generally displayed on a separate display unit that is remotely located from the electronic trip unit.

Further after identification of the electrical fault, the maintenance personnel is required to change and monitor the various operational parameters or settings associated with the electrical circuit and the circuit breaker, such as current, voltage and power for controlling operations of the circuit breaker and the electrical circuit for rectifying the electrical fault. All these operations are performed by programming the Electronic Trip Unit (ETU) by using an interface mounted on the Electronic Trip Unit (ETU). The conventional electronic trip units may utilize a separate Human Machine Interface (HMI) for programming the Electronic Trip Unit (ETU). In case of such separate Human Machine Interface (HMI) or interface configured on the electronic trip unit, the user has to navigate through different screens for programming the Electronic Trip Unit, and as such these systems are difficult to operate. Such Human Machine Interface (HMI) configured on the conventional electronic trip unit for programming the Electronic Trip Unit (ETU) may require the user to access different display screens and may cause confusion and undue delay. Further, such Human Machine Interface (HMI) configured on the conventional electronic trip unit is not properly controlled and are inaccurate and ineffective.
The programming of the Electronic Trip Unit (ETU) for rectification of the electrical fault is based on the data captured at the time of circuit breaker tripping, which is remotely available at the separate display devices. Furthermore, data captured at the time of circuit breaker tripping is required to be analyzed and monitored. Such configuration of the conventional Electronic Trip Unit (ETU) may force the maintenance personnel to shuffle between the Electronic Trip Unit (ETU) and the display device that displays the data captured at the time of the circuit breaker tripping, thereby causing a lot of inconvenience, confusion and chaos.
The present disclosure envisages an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that ameliorates

one or more problems of the prior art. The interactive display system intuitively displays data generated using information captured during circuit breaker tripping, thereby facilitating in identifying of fault(s) in an electrical system that caused tripping of the circuit breaker. More specifically, the interactive display system displays a fault oscillograph generated using information captured during circuit breaker tripping. The interactive display system further receives inputs and instructions for programming the Electronic Trip Unit (ETU). More specifically, the Electronic Trip Unit (ETU) receives instructions for changing operational parameters associated with the circuit breaker for controlling operation thereof based on electrical fault(s) detected, thereby facilitating monitoring, analyzing of different parameters of the electrical system and ensuring proper maintenance and safety of the electrical system. The interactive display system not only facilitates identification and display of cause(s) of fault(s) in the electrical circuit that caused tripping of the circuit breaker, but also facilitates monitoring, analyzing different parameter of the electrical system and changing of operational parameters of the circuit breaker, thereby ensuring proper maintenance and safety of the electrical system.
Figure 1 illustrates a schematic representation of an interactive display system (100) institutively displaying a fault oscillograph (10) generated by using information captured during circuit breaker tripping or pick-up. The interactive display system (100) is mounted on an Electronic Trip Unit (ETU) of a circuit breaker. The fault oscilloscope (10) is a graph that depicts variation of current with time during the tripping of the circuit breaker. The interactive display system (100) can further display other data such as graph(s) depicting variation in voltage with time during tripping of the circuit breaker, wherein such graphs may provide useful information regarding the condition(s) of the electrical system at the time of the circuit breaker tipping, thereby facilitating identifying of fault(s) in an electrical system that caused tripping of the circuit breaker. In accordance with an embodiment of the present disclosure, the interactive display system (100) can display 15 cycles of current / voltage waveform captured during circuit breaker

tripping, particularly, 10 before circuit breaker tipping and 5 after circuit breaker tipping. Such comprehensive display of current / voltage waveform(s) captured during circuit breaker tripping facilitate precise identifying of fault(s) in an electrical system that caused tripping of the circuit breaker.
The Electronic Trip Unit (ETU) of the present invention is a microcontroller based trip unit. The Electronic Trip Unit (ETU) samples the analog signals at the input of the Analog to Digital Converter (ADC). These samples are stored in the RAM of the microcontroller. In the event of occurrence of a trip / pick-up condition, the sampled values of 15 cycles (10 before occurrence of event and 5 after) are plotted on the TFT display of the interactive display system (100). The graphical data is plotted on a time axis along X-axis and a current/voltage axis along the Y-axis. The time axis is divided into 300 steps, wherein each step represents 1 millisecond (ms). In this way plot data of 300 ms i.e. equivalent of 15 cycles is plotted. For each step, the sampled amplitude is represented as a dot on the TFT screen. These dots take the color of the phase. Once these dots are plotted, the waveform is reproduced.
The interactive display system (100) may also display other information that may be useful in identifying the faults that caused the tripping of the circuit breaker and is not limited to display of graphs depicting variation of current and voltage with time. The interactive display system (100) may display other waveforms that may be used for analysing the conditions at the time of circuit breaker tripping and identifying the electrical fault that caused the circuit breaker tripping. The interactive display system (100) is provided with provision (20) for zooming in and zooming out of the graphical data such as the fault oscilloscope (10) displayed thereon. In accordance with an embodiment, the touch screen can provide 4X optical zoom to better viewing of the graphical data displayed thereon. The 4X optical zoom feature facilitates better comprehension and visualization of the fault condition. The interactive display system (100) may further include other provisions for enhancing the display and readability of the graphical data such as

the fault oscilloscope (10) displayed on the screen of the interactive display system (100). The interactive display system (100) receives inputs and instructions for programming the Electronic Trip Unit (ETU). The interactive display system (100) utilizes a touch screen that not only displays data required for identifying cause of fault but also facilitate programming of the Electronic Trip Unit (ETU) for rectification of the faults. As the touch screen has the ability to display and receive data on the same screen, the conventional keypad or switches that are used as input device in conventional Electronic Trip Units (ETU) are eliminated. Further, such a configuration of the interactive display system (100), imparts self-diagnostic characteristics to the Electronic Trip Unit (ETU).
As the interactive display system (100) is mounted on the Electronic Trip Unit (ETU) itself, the interactive display system (100) not only emulates the oscilloscope (10) or any other graphical data required for identifying the electrical fault at the occurrence of fault condition but also facilitates programming of the Electronic Trip Unit (ETU) for the rectification of the fault, such configuration enables an end user to analyze the oscilloscope (10) and program the Electronic Trip Unit (ETU), then and there, thereby saving his time and effort that would otherwise be required in case the display screen for displaying information regarding faults in the electrical system and programming screen are separated located as is in the case of conventional Electronic trip Unit. The display of different types of waveforms captured on the ETU at one place during pickup/ trip of the circuit breaker provide end user essential fault related information and saves him the effort that is required in case of conventional Electronic Trip Unit, where the end user has to refer to an external display module(s) that may be remotely located. Further in case of the Electronic Trip Unit of the present invention, the need for an additional display for displaying information regarding faults in the electrical system as is in the case of conventional Electronic Trip Unit (ETU) is eliminated.

The electronic Trip Unit (ETU) of the present invention performs waveform capture on fault / pick-up condition and displays the waveform capture on the ETU itseif which also includes provision for programming the Electronic Trip unit, thereby providing the end user a self-diagnostic system that identify the cause of the occurrence of fault and an in-situ rectifying system that rectifies the fault based on the fault identified.
In accordance with one embodiment of the present invention, the interactive display system (100) is a touch screen based Liquid Crystal Display (LCD). In accordance with another embodiment, the interactive display system (100) is a touch screen based (Organic Light Emitting Diodes) OLED display device. In accordance with still another embodiment, the interactive display system is a touch screen based Thin Film Transistor (TFT) display screen. The touch screen of the interactive display system (100) is sturdy, does not fail frequently and has longer service life. The touch screen of the interactive display system (100) can withstand shocks, vibrations, exposure to detrimental chemicals and other unfavourable environment conditions. The touch screen of the interactive display system (100) is a 262K color LCD-TFT display that enhances the visual appearance of the Electronic Trip Unit (ETU). ADVANATGES OF THE INVENTION
The Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon in accordance with the present invention for displaying data required by maintenance personnel to identify cause(s) for electrical fault(s) that led to circuit breaker tripping has several technical advantages including but not limited to the realization of:
• an Electronic Trip Unit (ETU) for circuit breakers with an interactive
display system configured thereon, wherein the interactive display system not only facilitates identification and display of cause(s) of fault(s) in an electrical circuit that caused tripping of the circuit breaker, but also

facilitates programming of the Electronic Trip Unit, thereby ensuring proper maintenance and safety of the electrical system;
• an Electronic Trip Unit (ETU) for circuit breakers that captures
information pertaining to tripping of the circuit breaker and spontaneously
displays data for assisting maintenance personnel in quickly and
conveniently identifying exact cause of the electrical failure that caused the
tripping of the circuit breaker;
• an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that displays all data regarding an electrical fault that caused circuit breaker tripping, on one screen, thereby imputing self diagnostic characteristics to the Electronic Trip Unit (ETU);
• an Electronic Trip Unit (ETU) for circuit breakers with an interactive
an electrical fault that caused circuit breaker tripping on one screen, thereby eliminating the need to navigate to different screens for accessing diffident set of information/data;
• an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that assists the maintenance personnel to timely rectify the electrical fault by providing necessary data to the maintenance personnel in a easy to understand and readable format;
• an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that enables the maintenance personnel to read the data pertaining to the electrical faults displayed thereon from a wider viewing angle;
• an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that assists maintenance personal in analysing and monitoring various parameters associated with the electrical circuit and the circuit breaker and identifying the exact cause of the electrical fault before proceeding with the rectification of the electrical fault;

• an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that is reliable;
• an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that facilitate changing of the various operational parameters associated with the electrical circuit and the circuit breaker, such as current, voltage and power for controlling operations of the circuit breaker and the electrical circuit for rectifying the electrical fault;
• an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that is sturdy, does not fail frequently and has longer service life;
• an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that is simple in construction, convenient to use and inexpensive;
• an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that can withstand shocks, vibrations, exposure to detrimental chemicals and other unfavourable environment conditions;
• an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that may be easily retrofitted and used with any of the conventionally known circuit breakers; and
• an Electronic Trip Unit (ETU) for circuit breakers with an interactive display system configured thereon that displays useful data required for ensuring proper maintenance and safety of the power distribution system.
Throughout this specification the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.

The use of the expression "at least" or "at least one" suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the invention to achieve one or more of the desired objects or results.
Any discussion of documents, acts, materials, devices, articles or the like that has been included in this specification is solely for the purpose of providing a context for the invention. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the invention as it existed anywhere before the priority date of this application.
The numerical values mentioned for the various physical parameters, dimensions or quantities are only approximations and it is envisaged that the values higher/lower than the numerical values assigned to the parameters, dimensions or quantities fall within the scope of the invention, unless there is a statement in the specification specific to the contrary.
While considerable emphasis has been placed herein on the specific features of the preferred embodiment, it will be appreciated that many additional features can be added and that many changes can be made in the preferred embodiment without departing from the principles of the invention. These and other changes in the preferred embodiment of the invention will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

We Claim:
1. An Electronic Trip Unit (ETU) for a circuit breaker comprising an interactive display system configured thereon, said interactive display system adapted to intuitively display data generated using information captured during circuit breaker tripping, thereby facilitating identifying fault(s) in an electrical system that caused tripping of said circuit breaker, said interactive display system further adapted to receive inputs and instructions for programming the Electronic Trip Unit (ETU).
2. The Electronic Trip Unit (ETU) as claimed in claim I, wherein said interactive display system is a touch screen adapted to display a fault oscillograph generated using information captured during circuit breaker tripping.
3. The Electronic Trip Unit (ETU) as claimed in claim 1, wherein said interactive display system is a touch screen adapted to receive instructions for changing operational parameters associated with said circuit breaker for controlling operation thereof based on electrical fault(s) detected, thereby facilitating monitoring, analyzing of different parameters of said electrical system and ensuring proper maintenance and safety of said electrical system.
4. The Electronic Trip Unit (ETU) as claimed in claim 1, wherein said interactive display system is a touch screen based Liquid Crystal Display (LCD).
5. The Electronic Trip Unit (ETU) as claimed in claim 1, wherein said interactive display system is a touch screen based (Organic Light Emitting Diodes) OLED display device.

6. The Electronic Trip Unit (ETU) as claimed in claim 1, wherein said interactive display system is a touch screen based Thin Film Transistor (TFT) display screen.