DESC:TECHNICAL FIELD

The present invention relates generally to electronic circuit breakers and, particularly, to a testing basic functionality of the electronic trip unit and programming of the Electronic Trip unit of a microprocessor based circuit breaker.

BACKGROUND

An electronic trip unit is an intelligent device used in conjunction with an electro-mechanical circuit breaker to measure system parameters such as voltage, current, power etc and protect the system against abnormal conditions such as overload, short circuit, earth fault, instantaneous, etc., by interrupting the electrical circuit. An Electronic Circuit Breaker is rated at predetermined amperage that indicates the threshold current, which when passed through the circuit breaker will cause the breaker to trip.

Circuit Breakers require regular testing by maintenance personnel to ensure their proper functionality. This testing is carried out with the help of a testing kit which is interfaced with the breaker. The testing kit, in turn, generates a signal, which is similar to that of the true signal that would otherwise enter the breaker. According to the fault settings made on the breaker, the generated signal would then be able to trip the breaker and thus, verify its functioning. The problem found, if any, can be diagnosed using the testing kit and the breaker replaced or repaired accordingly.

It is often noticed on field that the circuit breakers need to be tested for various protection settings like Earth Fault, Instantaneous, Instantaneous Override, Short Circuit, Overload etc. In order to have a compact Pocket –size device, to be able to test all these protection settings, there are two available options. Either a wide range of signals are provided on the testing device which tests the trip unit, keeping the electronic trip unit settings constant, or a constant signal is fed in to the electronic trip unit and various protections are inspected by varying the settings on the trip unit. The former involves complexity of the testing device where as the latter involves manual intervention with the electronic trip unit, which might not be always feasible.

Along with the testing, it is noticed that certain protection settings like instantaneous or earth fault might be needed to be tested in isolation to diagnose the functionality of that particular protection. In order to do that, the other protection settings need to be disabled for a while. A direct programming link needs to be established where the testing/ programming device behaves as a programmer, altering the electronic trip unit software, according to the testing requirement. Thus, there is a need for a testing kit that could first establish a link to program the processor of the microprocessor based electronic trip unit followed by performing the necessary inspection by injecting required signals of those particular protections, thereby validating the functionality of the electronic trip unit. For example, a field requirement states that earth fault should be disabled and the same tested using the testing device. The required device should be able to re-program the electronic trip unit with earth fault disabled and then, inject signals to verify that the breaker does not trip in earth fault.

The prior-art document CN 202815584 discloses an ETU (electronic controller) calibration instrument, comprising a power module, a signal module, a calibrating and controlling module, and a displaying and measuring module. However the design of the control unit in the said prior-art adds to the bulkiness of the calibration instrument apart from the bulkiness rendered by the Display module of the calibration Instrument. Apart from calibration, the instrument does not provide facilities to temporarily deactivate certain protection settings in the Circuit Breaker.

The prior-art document US 20090072022 discloses a communication module plug-in device for an electronic trip unit including both wired and wire-less conventional communication methodologies. However, the focus of the patent document lies primarily on the Communication of an external device with the Electronic Trip unit. The communication capability adds complexity to the device. The primary aim of the invention disclosed here is to test the functionality of the Electronic Trip unit, which seems to be a secondary function provided by the prior-art document US 20090072022 disclosed.

The prior-art document US 4814712 discloses a test kit for a digital and analog electronic circuit breaker determines the calibration and over current response of the circuit breaker when connected within an electric power circuit. However in the above patent, the Test kit is powered using an AC source. There are two major drawbacks that can be identified in circuits employing AC source. Firstly, Conversion of AC to Dc makes the System Bulky and secondly, availability of AC source in remote locations is sparse, thus limiting the usage of the Testkit in remote Locations. The invention proposed here makes use of 3VDC, made available by the use of two 1.5V batteries, making the test kit compact and independent, apt for remote locations as well.

In the view of above mentioned drawbacks and limitation, there exists a need of portable, efficient and easy to use testing devices that can program the electronic trip unit of a microprocessor based circuit breaker and then inject signals required to test the software changes made in the electronic trip unit.

SUMMARY

This summary is provided to devices, systems, and methods of testing a circuit breaker containing an electronic trip unit. This summary is not intended to identify essential features of the subject matter nor is it intended for use in determining or limiting the scope of the subject matter.

In one implementation, the invention relates to a testing apparatus used to test the basic functionality of the electronic trip unit of the circuit breaker. This invention also includes a feature to modify the protection settings by programming the electronic trip unit of a microprocessor based circuit breaker.

In one implementation, an apparatus and method of testing the basic functionality and programming of the ETU of a microprocessor based circuit breaker using a battery operated hand held test kit is disclosed.

In one implementation, the testing apparatus is disclosed that is used to test the basic functionality of the Electronic trip unit of the Circuit Breaker.

The present invention also includes a feature to modify the protection settings by programming the Electronic Trip unit of a microprocessor based circuit breaker.

In one implementation, the present invention is an apparatus and method of testing the basic functionality and programming of the electronic trip unit of a microprocessor based circuit breaker using a battery operated hand held test kit.

Accordingly, in one implementation, a hand held device (11) to test functionality and programming of an Electronic Trip unit (ETU) (2) of a circuit breaker (1) is disclosed. The hand held device (11) comprises of a five pin connector (5), a power LED (6), an indicator LED (7), a trip indicator LED (10), and at least three switches to test said ETU (2), wherein said at least three switches comprises of a push button switch (12), a slide switch (8), and an edge switch (9).

In one implementation, a system for testing functionality and programming of an Electronic Trip unit (ETU) of a circuit breaker using a hand held device (11) is disclosed. The system comprises of a circuit breaker (1) having a microprocessor and an Electronic Trip unit (ETU) (2). The hand held device (11) comprises of a power source block (13) coupled to a voltage boost block (15) and to a battery test block (14). An output of said voltage boost block (15) is connected to a flux shift device voltage generation block (16) for a generation of a voltage signal, used to drive said hand held device (11), connected to the ETU (2), wherein said flux shift device voltage generation block (16) is coupled to an interface unit (19). The flux shift device voltage generation block (16) is also connected to a trip test signal generation block (17) that is responsible for the development of a voltage signal used to issue a trip command to ETU (2), wherein said trip test signal generation block (17) is coupled to said interface unit (19). A protection setting control block (18) coupled to said interface unit (19). The system further comprises of a five pin connector (5) is interfaced to ETU (2) of said circuit breaker (1) through a cable (4), which terminates into a five pin connector socket (3) on ETU (2).

In one implementation, a method for testing functionality and programming of an Electronic Trip unit (ETU) (2) of a circuit breaker (1) using a hand held device (11) is disclosed. The method comprises of providing said hand held device (11) containing a plurality of circuits configured to enables or disables a functionality of a particular protection setting, which further enables testing a particular setting of Electronic Trip unit (ETU) (2) of said circuit breaker (1); temporarily connecting said hand held device (11) to said circuit breaker (1) containing Electronic Trip unit (ETU) (2) to be tested; connecting a power source within said hand held device (11) to a battery circuit for supplying operating power to said hand held device (11) during testing; testing ETU (2) using at least three switches that controls the testing procedure, wherein said at least three switches comprises of a push button switch (12), a slide switch (8), and an edge switch (9).

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the drawings to refer like features and components.

Figure 1 illustrates a pictorial view of a circuit breaker having an electronic trip unit with the battery operated hand held testing kit of the invention in position with the circuit breaker for use there within is shown, in accordance with an embodiment of the present subject matter.

Figure 2 illustrates a simplified functional block diagram of the battery operated hand held testing kit of the invention is shown, in accordance with an embodiment of the present subject matter.

Figure 3 illustrates a method for testing functionality and programming of an Electronic Trip unit (ETU) (2) of a circuit breaker (1) using a hand held device (11), is shown, in accordance with an embodiment of the present subject matter.

Figure 4 illustrates a schematic diagram of the battery operated hand held testing kit of the invention, is shown, in accordance with an embodiment of the present subject matter.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

Preferred embodiments of the present disclosure will be described herein below with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid obscuring the present disclosure in unnecessary detail.

The terms and words used in the following description 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.

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.

In one implementation, the present invention is an apparatus and method of testing the basic functionality and programming of the electronic trip unit of a microprocessor based circuit breaker using a battery operated hand held test kit.

In one implementation, a hand held device (11) to test functionality and programming of an Electronic Trip unit (ETU) (2) of a circuit breaker (1) is disclosed. The hand held device (11) comprises of a five pin connector (5), a power LED (6), an indicator LED (7), a trip indicator LED (10), and at least three switches to test said ETU (2), wherein said at least three switches comprises of a push button switch (12), a slide switch (8), and an edge switch (9).

In one implementation, said hand held device (11) is a battery operated hand held testing kit (11) capable of being held in hands of a user.

In one implementation, said five pin connector (5) is interfaced to ETU (2) of said circuit breaker (1) through a cable (4), which terminates into a five pin connector socket (3) on ETU (2).

In one implementation, said at least three switches controls the testing procedure of ETU (2).

In one implementation, said push button switch (12) is responsible for giving a trip signal command to said circuit breaker (1) through said five pin connector (5) and said cable (4).

In one implementation, said slide switch (8) is used for powering ON and OFF functionality of said hand held device (11).

In one implementation, said edge switch (9) is used to alter at least one protection settings required to test the functionality of said ETU (2).

In one implementation, said power LED (6) emits a light as soon as said hand held device (11) is switched ON.

In one implementation, said indicator LED (7) is a low battery indicator configured to emit a light when a voltage across a battery of said hand held device (11), falls below a particular threshold voltage.

In one implementation, when said battery voltage falls below said particular threshold, said power LED (6) stops emitting said light and correspondingly, said low battery indicator LED (7) begin emitting said light.

In one implementation, said trip indicator LED (10) emits a light every time a trip command is fed to ETU (2).

In one implementation, a system for testing functionality and programming of an Electronic Trip unit (ETU) of a circuit breaker using a hand held device (11) is disclosed. The system comprises of a circuit breaker (1) having a microprocessor and an Electronic Trip unit (ETU) (2). The hand held device (11) comprises of a power source block (13) coupled to a voltage boost block (15) and to a battery test block (14). An output of said voltage boost block (15) is connected to a flux shift device voltage generation block (16) for a generation of a voltage signal, used to drive said hand held device (11), connected to the ETU (2), wherein said flux shift device voltage generation block (16) is coupled to an interface unit (19). The flux shift device voltage generation block (16) is also connected to a trip test signal generation block (17) that is responsible for the development of a voltage signal used to issue a trip command to ETU (2), wherein said trip test signal generation block (17) is coupled to said interface unit (19). A protection setting control block (18) coupled to said interface unit (19). The system further comprises of a five pin connector (5) is interfaced to ETU (2) of said circuit breaker (1) through a cable (4), which terminates into a five pin connector socket (3) on ETU (2).

In one implementation, said power source (13) includes a set of batteries that provides powers to said hand held device (11) using DC power.

In one implementation, said flux shift device generation blocks (16) outputs a high output voltage, from which said trip signal voltage is generated with the help of at least one voltage dividing resistors.

In one implementation, said system is characterized in that, the protection setting control block (18) enables or disables a functionality of a particular protection setting, which further enables testing a particular setting of Electronic Trip unit (ETU) (2) of said circuit breaker (1).

In an exemplary embodiment of the present invention, the figure 1 illustrates a pictorial view of a circuit breaker having an electronic trip unit with the battery operated hand held testing kit of the invention in position with the circuit breaker for use there within. A circuit breaker (1) is shown, with an electronic trip unit (2) included in the circuit breaker (1). A battery operated hand held testing kit (11) capable of being held in the hands of the maintenance personnel includes a connector (5) which is interfaced to the electronic trip unit (2) of the circuit breaker (1) through a cable (4), which terminates into a connector socket (3) on the electronic trip unit (2). The battery operated hand held testing kit (11) includes three switches, to control the testing procedure of the electronic trip unit (11). A push button switch (12) is responsible for giving the trip signal command to the electronic circuit breaker (1) through a connector socket (5) and an interfacing cable (4). A slide switch (8) on the right side edge of the battery operated hand held testing kit (11) is used for powering ON/OFF functionality of the battery operated hand held testing kit (11), whereas a switch (9) on the left edge of the battery operated hand held testing kit is used to alter the protection settings required to test the functionality of the electronic trip unit (2).

A power LED (6) emits a green glow as soon as the battery operated hand held testing kit (11) is switched ON. A Low Battery Indicator LED (7) emits a Red glow when the voltage across the Battery, falls below a threshold voltage. The invention is designed in a way that once the battery voltage falls below a particular threshold, the Power ON Led (6) would stop emitting the green light and correspondingly, the Low Battery Indicator LED (7) would begin emitting the RED glow. A trip indicator LED (10), placed above the push button switch (12), responsible for the trip signal, emits a yellow glow every time a trip command is fed to the electronic trip unit (2).

In an exemplary embodiment of the present invention, the figure 2 illustrates a simplified functional block diagram of the battery operated hand held testing kit of the invention. As shown in the figure, a power source block (13) is coupled to a Voltage boost Block (15) and to a battery test block (14). The output of the Voltage Boost Block (15) is connected to a Flux shift device voltage generation block (16) for the generation of a voltage signal, used to drive the Flux Shift Device, connected to the electronic trip unit (2) in the circuit breaker (1). The Flux shift device voltage generation block (16) is thus directly connected to the interface block (19). The Flux shift device voltage generation block (16) is also connected to the trip test signal generation block (17) that is responsible for the development of the voltage signal used to issue a trip command to the electronic trip unit (2) in the circuit breaker (1). Thus the output of the trip signal generation block (17) is directly connected to the interface block (19). The protection setting control block (18) is also connected to the interface block (19).

The power source block (13) contains a set of batteries that powers the battery operated hand held testing kit (11) using DC power. The slide switch (8) is used to switch on-off the power supply to the battery operated hand held testing kit (11). The Battery test block (14) consists of two LED’s (6) and (7) as shown in figure 1. The Power ON LED emits (6) green lights when the battery operated hand held testing kit (11) is switched ON and also indicates the Health of the battery as reasonably good to carry out reliable functionality tests on the circuit breaker (1). Once the voltage across the battery falls below a particular threshold voltage, the Green LED is forced to turn off, making a Low Battery Indicator LED (7) to emit RED light, asking the user to replace the Battery in order to proceed with the testing procedure. The voltage boost block (15) takes the comparatively low voltage from a healthy battery and boosts the voltage to a value required to energize the Flux Shift device used to cause the Circuit Breaker (1) to open. The flux shift device generation blocks (16) give a high output voltage, from which the trip signal voltage is also generated with the help of voltage dividing resistors. The protection setting control block 18 enables or disables the functionality of a particular protection setting, thus testing a particular setting in isolation.

Referring now to figure 3, a method for testing functionality and programming of an Electronic Trip unit (ETU) (2) of a circuit breaker (1) using a hand held device (11), is shown, in accordance with an embodiment of the present subject matter.

The order in which the method is described is not intended to be construed as a limitation, and any number of the described method blocks can be combined in any order to implement the method or alternate methods. Additionally, individual blocks may be deleted from the method without departing from the scope of the subject matter described herein. Furthermore, the method can be implemented in any suitable hardware, software, firmware, or combination thereof. However, for ease of explanation, in the embodiments described below, the method may be considered to be implemented in the above described for testing functionality and programming of an Electronic Trip unit (ETU) (2) of a circuit breaker (1) using a hand held device (11).

At block 302, a hand held device (11) containing a plurality of circuits configured to enables or disables a functionality of a particular protection setting, which further enables testing a particular setting of Electronic Trip unit (ETU) (2) of said circuit breaker (1) is provided.

At block 304, said hand held device (11) is temporarily connected to said circuit breaker (1) containing Electronic Trip unit (ETU) (2) to be tested.

At block 306, a power source within said hand held device (11) is connected to a battery circuit for supplying operating power to said hand held device (11) during testing.

At block 308, ETU (2) is tested using at least three switches that controls the testing procedure, wherein said at least three switches comprises of a push button switch (12), a slide switch (8), and an edge switch (9).

The details of the testing are given in the preceding sections.

In an exemplary embodiment of the present invention, the figure 4 illustrates a schematic diagram of the battery operated hand held testing kit of the invention. The battery block (13) contains a pair of serially connected batteries. Switch SW4 which is connected to the positive terminal of the serially connected batteries is responsible for powering the battery operated hand held testing kit (11). On toggling the switch SW4 in ON position, the combined voltage appears at the collector of transistor Q1 through the current limiting resistor R18, collector of transistor Q2 through current limiting resistor R17 and at the collector of transistor Q3. The Resistors R8, R14, R15 and R16 are used to set the desired threshold voltage.

There may be two cases possible, as described below:

Case 1: the Battery Voltage is above the set threshold.

The collector –base junction of the NPN transistor Q1 is reverse biased whereas the emitter – base junction is forward biased, enabling the Power ON LED D9 to glow through the current limiting resistor R19. Similarly, NPN transistor Q2 has its collector- base junction reverse biased and emitter- base junction forward biased, in other words, transistor Q2 is ‘turned ON’, which causes the transistor Q3 to turn OFF as its collector – base junction is forward biased and emitter – base junction is reverse biased, making the Battery health LED D10 in reverse bias and thus the LED D10 does not glow.

Case 2: the Battery Voltage is below the set threshold.

The collector –base junction of the NPN transistor Q1 is forward biased whereas the emitter – base junction is reverse biased, taking the Power ON LED D9in reverse bias mode. Similarly, NPN transistor Q2 has its collector- base junction forward biased and emitter- base junction reverse biased, in other words, transistor Q2 is ‘turned OFF’, which causes the transistor Q3 to turn ON as its collector – base junction is reverse biased and emitter – base junction is forward biased, enabling the Battery health LED D10 to glow through the current limiting resistor R20.

The voltage from the battery is directly fed to the VIN pin of the boost converter IC U1. The enable pin EN of the boost converter IC U1 is always pulled high in order to avoid the Boost converter IC U1 from going into shutdown mode. The inductor L2 is used to determine the maximum switching frequency of the converter. The value of the inductor L2 ranges between 2.2uH and 47uH, depending on the application. The output voltage of the Boost converter IC U1 is determined by the formula:

VOUT=1.233*(1+R5/R6)

Where, 1.233 is the internal reference voltage of the boost converter IC U1. A high impedance voltage divider is used with a typical value of R6= 200K? and maximum value of R5 = 2.2M? as it’s a battery driven application. The feed forward capacitor CFF across the upper feedback resistor R5 is required to provide sufficient overdrive for the error comparator inside the boost converter IC U1. In order to receive greater efficiency, a Scotty diode D3 is used. The output capacitor C4 is used to provide voltage filtering. The voltage received at the output of the boost converter IC U1 is directly sent to the interface block 19 and is used as the voltage required to energize the flux shift device. This output voltage is further used to develop the Trip signal, used to trip the electronic circuit Breaker (1). The trip signal is generated using a voltage divider with the help of Resistors R10 and R11. The trip signal generated at the output of the voltage divider is passed through the push button (12) which is responsible for allowing the trip signal to pass through the interface block (19). Once the trip command is given through the push button SW6, the Trip signal LED D8 emits yellow light indicating the actuation of the trip command. A current limiting resistor R9 is used in series with the Trip Signal LED D8. Switch SW5 is used to enable or disable certain protection settings in the Electronic Trip Unit 2. Thus the signals that enter the interface block (19) consist of a) Flux shift device voltage; b) Trip signal, c) Protection control signal, and d) Ground signal e) Programming Circuit Interface

In the embodiments provided in the present application, it should be understood that the disclosed method, device, and data frame may be implemented in other manners. For example, the described device embodiments are merely exemplary. For example, the unit division is merely logical function division and can be other division in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features are negligible or not performed.

Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include those provided by the following features:

One feature of the invention is that, the proposed testing device is capable of programming the electronic trip unit of a microprocessor based circuit breaker as well as a test its basic functionality.

Another feature of the invention is that, the testing kit has been designed in a manner to make it user friendly, compact and portable. The Front Display is kept simple in order to reduce the Complexity of Programming an Electronic Trip unit. It has been designed in a way so that minimally skilled personnel will efficiently be able to program an Electronic Trip Unit on Field.

Still another feature of the invention is that, the testing kit is provided with the test protection settings like Overload, Short Circuit, Instantaneous, and Overload in the electronic trip unit with great accuracy and produce reliable results.

Yet another feature of the invention is that, the testing kit uses two units of 1.5V AA Alkaline batteries, with high life expectancy, providing an economical and high efficiency test solution on field.

Apart from the above mentioned features of the invention, the novel features of the invention are given below:

1. The design disclosed in the present invention may be created in a way such that although it makes use of a Low level Power Source (2 X 1.5V batteries = 3V), the circuit is Capable of generating enough power to drive the Electronic Trip Unit.
2. The number of trip operations possible with the designed circuit is greater than 1000, which gives a novelty in the design of the circuit parameters to generate signals repeatedly without exhausting the power Source.
3. The Low battery indicator Circuit designed is crafted in a way to sense voltage Levels below 2.4V and make the indicator LED glow. Tailoring a circuit with such low Voltage levels involves a great deal of testing and novelty. The Low battery indicator integrated Circuits and designs available in the already Existing Prior arts, deal with voltage levels greater than 4.5V, which relaxes the design constraints of the circuit. Achieving a Low battery Indicator with such Low Voltage Level brings about a great deal of novelty in the invention
4. The disclosed invention deals with a conglomerate of Testing Features as well as programming Features. A design capable of achieving both the herculean tasks within a single circuit, along with the compactness of the design and great deal of reliability, adds into the novelty of the invention.

It is well understood by a person skilled in the art that above mentioned novel features are with reference to an exemplary embodiment of the present invention and may not restrict the scope of the present invention.

Although devices, systems, and methods of testing a circuit breaker containing an electronic trip unit has been described in language specific to structural features and/or methods, it is to be understood that the embodiments disclosed in the above section are not necessarily limited to the specific features or methods or devices described. Rather, the specific features are disclosed as examples of devices, systems, and methods of testing a circuit breaker containing an electronic trip unit.
,CLAIMS:1. A hand held device (11) to test functionality and programming of an Electronic Trip unit (ETU) (2) of a circuit breaker (1), the hand held device (11) comprising:
a five pin connector (5);
a power LED (6);
an indicator LED (7);
a trip indicator LED (10);
at least three switches to test said ETU (2), wherein said at least three switches comprises of a push button switch (12), a slide switch (8), and an edge switch (9).

2. The hand held device (11) as claimed in claim 1 is a battery operated hand held testing kit (11) capable of being held in hands of a user.

3. The hand held device (11) as claimed in claims 1 and 2, wherein said five pin connector (5) is interfaced to ETU (2) of said circuit breaker (1) through a cable (4), which terminates into a five pin connector socket (3) on ETU (2).

4. The hand held device (11) as claimed in claims 1-3, wherein said at least three switches controls the testing procedure of ETU (2).

5. The hand held device (11) as claimed in claims 1-4, wherein said push button switch (12) is responsible for giving a trip signal command to said circuit breaker (1) through said five pin connector (5) and said cable (4).

6. The hand held device (11) as claimed in claims 1-5, wherein said slide switch (8) is used for powering ON and OFF functionality of said hand held device (11).

7. The hand held device (11) as claimed in claims 1-6, wherein said edge switch (9) is used to alter at least one protection settings required to test the functionality of said ETU (2).

8. The hand held device (11) as claimed in claims 1-7, wherein said power LED (6) emits a light as soon as said hand held device (11) is switched ON.

9. The hand held device (11) as claimed in claims 1-8, wherein said indicator LED (7) is a low battery indicator configured to emit a light when a voltage across a battery of said hand held device (11) , falls below a particular threshold voltage.

10. The hand held device (11) as claimed in claims 1-9, wherein when said battery voltage falls below said particular threshold, said power LED (6) stops emitting said light and correspondingly, said low battery indicator LED (7) begin emitting said light.

11. The hand held device (11) as claimed in claims 1-9, wherein said trip indicator LED (10) emits a light every time a trip command is fed to ETU (2).

12. A system for testing functionality and programming of an Electronic Trip unit (ETU) of a circuit breaker using a hand held device (11), said system comprising:
a circuit breaker (1) having a microprocessor and an Electronic Trip unit (ETU) (2);
said hand held device (11) comprising:
a power source block (13) coupled to a voltage boost block (15) and to a battery test block (14);
an output of said voltage boost block (15) is connected to a flux shift device voltage generation block (16) for a generation of a voltage signal, used to drive said hand held device (11), connected to the ETU (2), wherein said flux shift device voltage generation block (16) is coupled to an interface unit (19);
said flux shift device voltage generation block (16) is also connected to a trip test signal generation block (17) that is responsible for the development of a voltage signal used to issue a trip command to ETU (2), wherein said trip test signal generation block (17) is coupled to said interface unit (19);
a protection setting control block (18) coupled to said interface unit (19); and
a five pin connector (5) is interfaced to ETU (2) of said circuit breaker (1) through a cable (4), which terminates into a five pin connector socket (3) on ETU (2).

13. The system as claimed in claim 12, wherein said power source (13) includes a set of batteries that provides powers to said hand held device (11) using DC power.

14. The system as claimed in claims 12 and 13, wherein said flux shift device generation blocks (16) outputs a high output voltage, from which said trip signal voltage is generated with the help of at least one voltage dividing resistors.

15. The system as claimed in claims 12-14 is characterized in that, the protection setting control block (18) enables or disables a functionality of a particular protection setting, which further enables testing a particular setting of Electronic Trip unit (ETU) (2) of said circuit breaker (1).

16. A method for testing functionality and programming of an Electronic Trip unit (ETU) (2) of a circuit breaker (1) using a hand held device (11), said method comprising:
providing said hand held device (11) containing a plurality of circuits configured to enables or disables a functionality of a particular protection setting, which further enables testing a particular setting of Electronic Trip unit (ETU) (2) of said circuit breaker (1);
temporarily connecting said hand held device (11) to said circuit breaker (1) containing Electronic Trip unit (ETU) (2) to be tested;
connecting a power source within said hand held device (11) to a battery circuit for supplying operating power to said hand held device (11) during testing;
testing ETU (2) using at least three switches that controls the testing procedure, wherein said at least three switches comprises of a push button switch (12), a slide switch (8), and an edge switch (9).