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1 Products availableOur Complete range of products are Microprocessor Based Static ELR 30-3000mA, Microprocessor Based Static ELR1-8A, Earth Fault Relay, Microprocessor Based Static ELR 1-10A and Numerical Digital HT Relay.
INSTALLATION PROCEDURE FOR EARTH LEAKAGE RELAY CBCT :
Prok dv's make Static Earth Leakage Relay (ELR) with Core Balance Current Transformer ( CBCT/ ZCT) are used to detect the leakage current in an Electrical Power System. Static EarthLeakage Relay (ELR) Transmits a signal to activate the trip coil of the MCCB/ACB/OCBCONTACTOR in the event of Earth leakage, resulting in automatic isolation of the electricalpower system. Static earth leakage relay (ELR) and core balance current transformer (CBCT /ZCT) have been widely used and accepted because these have field adaptability and areeconomic.
Earth Leakage Current give rise to generation of heat and result in progressive failure ofinsulation, which leads to earth faults sparking flashovers, deterioration of earthing and finallyresults into catastrophic fires which destroys costly equipments, gadgets and precious lives.It is therefore essential to detect earth leakage current well before they cross the thresholdlimits and isolate the circuit in the event of leakages. Conventional over current and shortcircuit protection device are not designed detect earth leakage currents.
Prok dv's make Static Earth Leakage Relay (ELR) with Core Balance Current Transformer ( CBCT/ ZCT) are used to detect the leakage current in an Electrical Power System. Static EarthLeakage Relay (ELR) Transmits a signal to activate the trip coil of the MCCB/ACB/OCBCONTACTOR in the event of Earth leakage, resulting in automatic isolation of the electricalpower system. Static earth leakage relay (ELR) and core balance current transformer (CBCT /ZCT) have been widely used and accepted because these have field adaptability and areeconomic.
Prok dv's make Earth Leakage Relay (ELR) MPEL series uses the state-of-the-art, Digitalmicroprocessor/micro controller based protection device to detect low level leakage dueto degradation of insulation of phase conductors or high impedance faults.The main featureof Digital microprocessor/microcontroller Earth Leakage Relay (ELR) continuous display ofearth leakage currents of the power system. The unit has immunity to external disturbancelike harmonics and transients.
PROK DEVICES PVT LTD an ISO 9001-2008 company introduces DIGITAL
MICROPROCESSOR / MICROCONTROLLER BASED IDMT / DEFINITE TIME / INSTANTANEOUS
EARTH FAULT RELAY (EFR).It is a current sensing device which is tropicalised professionally
designed and tested for protection of Generators, Transformers and Feeders. Prok dv's
make DIGITAL MICROPROCESSOR / MICROCONTROLLER BASED IDMT / DEFINITE TIME /
INSTANTANEOUS EARTH FAULT RELAY (EFR) can be employed with various earth fault protective
schemes, which are explained in brief with figures. The magnitude of the earth fault current
depends on the fault impedance and invariably the fault impedance for earth fault is
higher than that for phase faults, hence the earth fault current is low compared to the
phase fault currents. The fault impedance depends on the system parameter and also on
type of earthing. The neutral may be solidly grounded, grounded through resistance or
reactance.
PDMPPRNEXM series offers a multi functional comprehensive smart protection solution for Feeder, Generator, Motor & Transformer segment.PDMPPRNEXM family of protective relays are advance numrical relays that provide multi protection and monitoring with reliable and fast protection solutions in single unit.
PNVNSP range of relays provide reliable and highperformance protection.The PNVNSP is a relay for AC Voltage supervision withuniversal application, it protects the three phase networkagainst over, under voltage, unbalance or earth faults inisolated networks. Beside the pure RMS value measurementof the line voltage the PNVNSP evaluates the symmetricalcomponents (U1, U2 & U0 sequence system). By evaluatingthese components relay PNVNSP can detect the phasesequence, voltage unbalance and earth faults.
The design of lockout relays is electro-mechanical, hinged armature type.It has been ensured to have consistent electrical & magnetic qualities while designing the Armature, Yoke and the core materials. The coil is wound with wires with high thermal rating to withstand the problems of over heating due to continuousrating. It is also ensured that the coil though rated for the very short time will tolerate the higher burden to ensure the faster operation. The series break contact will ensure the supply is cut off at a very short time of 10 ms breaking the inductive current.
The micro-controller continuously monitors the magnitude of the phase current andthe neutral current .whenever the phase current or the earth current magnitude exceeds thepresent value corresponding line / earth element will pick up and relay will trip after timeinterval calculated by the selected IDMT curves. Whenever the fault level exceeds theselected high set range, the relay will trip for high set, ignoring the selected IDMT curves. Thetimer logic is processed and after comparison with set time schedules, tripping signals areissued accordingly. There are two output relays , each output relay has two change overcontacts either for alarm or tripping. The output relays are programmable.The relay rating (In) is field selectable either 1A or 5A. The relay has RS 485 com port which canbe used with modbus protocol for communication purposes.
Relay has modbus protocol with RS 485 port with baud rate 9600bps. Anothermodel is established for special applications with baud rate115kbps.Relay records 99 faultswith date and time. Relay rating (In) is field selectable- either 1A/5A.The output relays areconfigurable Configurable options for enabling & disabling of high-set in both Phase &earth.
PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET DIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCT) WITH EARTH FAULT RELAY(EFR) receives the input current signals (phase current and neutral current) via four inputcurrent transformers. These signals are galvanically de-coupled, suitably filtered and fed tothe micro-controller, for amplitude calculation and further logical processing
Prok dv's make PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NONDIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCR) WITHEARTH FAULT RELAY (EFR) or independent over current Relay (OCR) or earth fault relay (EFR).This is intended for protection application in medium voltage networks. These networks mayhave isolated or resistance impedance earthed or solidly earthed neutral points. Definitetime over current relays are both suited for isolated systems and for use as back up todifferential relays and distance relays. Inverse time relays (over current relays with variousinverse times - current characteristics) are advantageous for interconnected systems andsolidly grounded systems. Another tool for reducing the tripping time for faults near thesource is to use the added instantaneous ( high set ) feature in the numeric relay .if the faultoccurs during the setting of relay , the relay shall operate / trip for the previously selected /default settings.
PDTPR series offers a multifunctional comprehensive smart protection solution for Feeder, Generator, Motor & Transformer segment.PDTPR family of protective relays are advance numrical relays that provide multi protection and monitoring with reliable and fast protection solutions in single unit
Prok dvs make AC DIGITAL MICROCONTROLLER BASED DEFINITE-TIME UNDER VOLTAGE (UV)AND OVER VOLTAGE (OV) RELAY / LINE VOLTAGE MONITOR (LVM) is a microcontroller basedvoltage monitoring and supervision relay for polyphase system. It can monitor bothunder voltage (uv) and over voltage (ov) conditions in the system. Both under voltage(uv)& over voltage(ov) conditions are associated with definite time tripping characteristics. Ithas wide setting range f or OV&UV settings and also wide range of operating time on theoccurrence of fault condition. DIGITAL MICROCONTROLLER BASED DEFINITE-TIME UNDERVOLTAGE (UV) AND OVER VOLTAGE (OV) RELAY / LINE VOLTAGE MONITOR (LVM) provideswide range of time delay for healthy resumption of the operating voltage.
All the line voltages are monitored and sensed simultaneously using three independentscale down potential transducer this low level ac signal is subjected to signal condition, which includes surge suppressors and harmonic filter, filtered signal is fed to the ADC of theindustrial grade pic micro controller, When the sensing voltage level exceeds the user setvalue f or under or over voltage, Digital Microcontroller based definite-time under voltage(uv) and over voltage (ov) relay/line voltage monitor(LVM) gives an output signal in the formof relay change over for tripping/alarming.
Prok dvs make AC DIGITAL MICROCONTROLLER BASED DEFINITE-TIME UNDER VOLTAGE (UV)AND OVER VOLTAGE (OV) RELAY / LINE VOLTAGE MONITOR (LVM) is a microcontroller basedvoltage monitoring and supervision relay for polyphase system. It can monitor bothunder voltage (uv) and over voltage (ov) conditions in the system. Both under voltage(uv)& over voltage(ov) conditions are associated with definite time tripping characteristics. Ithas wide setting range f or OV&UV settings and also wide range of operating time on theoccurrence of fault condition. DIGITAL MICROCONTROLLER BASED DEFINITE-TIME UNDERVOLTAGE (UV) AND OVER VOLTAGE (OV) RELAY / LINE VOLTAGE MONITOR (LVM) provideswide range of time delay for healthy resumption of the operating voltage.
Prok dvs makeAC Digital Microcontroller Based Definite-Time Under Voltage (UV) and Over Voltage (OV)/ Line Voltage Monitor (LVM)is a microcontroller based voltage monitoring and supervision relay for poly-phase system. It can monitor both under voltage (UV) and over voltage (OV) conditions in the system. Both under voltage (UV) & over voltage (OV) conditions are associated with definite time tripping characteristics. It has wide setting range of operating time on the occurrence of fault condition.
DIGITAL MICROCONTROLLER BASED DEFINITE TIME UNDER VOLTAGE (UV) AND OVER VOLTAGE RELAY/ LINE VOLTAGE MONITOR(LVM)provides wide range of time delay for healthy resumption of the operating voltage.
All the line voltages are monitored and sensed simultaneously using three independentscale down potential transducer this low level ac signal is subjected to signal condition, which includes surge suppressors and harmonic filter, filtered signal is fed to the ADC of theindustrial grade pic micro controller, When the sensing voltage level exceeds the user setvalue f or under or over voltage, Digital Microcontroller based definite-time under voltage(uv) and over voltage (ov) relay/line voltage monitor(LVM) gives an output signal in the formof relay change over for tripping/alarming.
Prok dv's Digital Microcontroller Based Numerical IDMT/Definite Time/Instantaneous (lowset/High set) Over Voltage (OV) Under Voltage (UV) Relay with Negative SequenceProtection offer reliable and flexible solutions for the protection of plants and feeders. Itincorporates IDMT characteristics, definite time characteristics and High speed featuresfor Over Voltage (OV) and Under Voltage (UV) settings. User friendly selection features-forover Voltage (OV) and Under Voltage (UV) settings. An Alphanumeric 2 line 16-characters, LCD display with membrane key pads for entering and changing parameters by user.Over Voltage (OV), Under Voltage (UV) relay trip indications are provided using LEDs. TheAux. Supply is provided by switched mode power supply with input voltage either AC orDC with wide range from 85V-275 AC/DC. In case of AC the power supply is designed tooperate from 45Hz to 65Hz.
Applications :
The micro-controller continuously monitors the magnitude of the phase current andthe neutral current .whenever the phase current or the earth current magnitude exceeds thepresent value corresponding line / earth element will pick up and relay will trip after timeinterval calculated by the selected IDMT curves. Whenever the fault level exceeds theselected high set range, the relay will trip for high set, ignoring the selected IDMT curves. Thetimer logic is processed and after comparison with set time schedules, tripping signals areissued accordingly. There are two output relays , each output relay has two change overcontacts either for alarm or tripping. The output relays are programmable.The relay rating (In) is field selectable either 1A or 5A. The relay has RS 485 com port which canbe used with modbus protocol for communication purposes.
The PAR type auxiliary relay are voltage operated relaysmainly used in control and alarm circuits.PAR series of relay are available in two basic modelsPAR-H and PAR-S. Auxiliary relay CAR-H is providedwith hand reset contacts. CAR-S is self reset type.PAR series of relays are available in 2-elements & 3-elements model. Each element can be energizedseparately.
The IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NON-DIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCR) WITH EARTH FAULT RELAY(EFR) of KP Series PNA TYPE is extensively used for selective short circuit and earth faultprotection of radial feeders in solidly earthed, resistance earthed or impedance earthedpower systems. It has wide applications in substations & industrial networks.
The IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NON-DIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCR) WITH EARTH FAULT RELAY(EFR) of PNA TYPE can also be used in most application where inverse time, definite timeand instantaneous relays are required. The relay gives selective phase and earth faultprotection in time graded systems for transformers, motor etc. If ensures reliable protectivesystem and clears only the faulted section.
Prok dvs make Microcontroller Based Motor Protection Relay PD-MMPR-303 uses the state-of-the-art Microcontroller based measurement techniques for providing protection for Motors up-to 75HP. The comprehensive protection features of the relay make it ideal for Motor protection. The heart of the relay is microcontroller based reliable hardware with special algorithms to calculate the tripping time. The relay continuously monitors the Three Phase Currents to build the thermal replica of the Motor. This thermal replica is used to protect the Motor against Thermal over Loads.The Microcontroller Based Motor Protection Relay does not require external Current Transformer (CT) for its operation for within the bandwidth of Im ranges. The three phase R, Y and B cables are made to pass through the CT hole which is in the relay. The built in CTs takes care of stepping down of the Currents to the required level. The stepped down three phase Currents are continuously monitored by the relay to detect any abnormal behavior of the Motor and to make tripping decision.
Generator and captive power plantOver frequency relay applied as backup protection for mechanical over speed devices to avoid damages to prime moverUnder frequency relay applied to protect field winding from excessive current, over regulator from overloadServo controller and invertors
The Microcontroller Based Motor Protection Relay does not require external Current Transformer (CT) for its operation for within the bandwidth of Im ranges. The three phase R, Y and B cables are made to pass through the CT hole which is in the relay. The built in CTs takes care of stepping down of the Currents to the required level. The stepped down three phase Currents are continuously monitored by the relay to detect any abnormal behavior of the Motor and to make tripping decision.
Features :
Relay has modbus protocol with RS 485 port with baud rate 9600bps. Anothermodel is established for special applications with baud rate115kbps.Relay records 99 faultswith date and time. Relay rating (In) is field selectable- either 1A/5A.The output relays areconfigurable Configurable options for enabling & disabling of high-set in both Phase &earth.
PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET DIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCT) WITH EARTH FAULT RELAY(EFR) receives the input current signals (phase current and neutral current) via four inputcurrent transformers. These signals are galvanically de-coupled, suitably filtered and fed tothe micro-controller, for amplitude calculation and further logical processing.
Prok dv's make PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NONDIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCR) WITHEARTH FAULT RELAY (EFR) or independent over current Relay (OCR) or earth fault relay (EFR).This is intended for protection application in medium voltage networks. These networks mayhave isolated or resistance impedance earthed or solidly earthed neutral points. Definitetime over current relays are both suited for isolated systems and for use as back up todifferential relays and distance relays. Inverse time relays (over current relays with variousinverse times - current characteristics) are advantageous for interconnected systems andsolidly grounded systems. Another tool for reducing the tripping time for faults near thesource is to use the added instantaneous ( high set ) feature in the numeric relay .if the faultoccurs during the setting of relay , the relay shall operate / trip for the previously selected /default settings.
PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET DIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCT) WITH EARTH FAULT RELAY(EFR) receives the input current signals (phase current and neutral current) via four inputcurrent transformers. These signals are galvanically de-coupled, suitably filtered and fed tothe micro-controller, for amplitude calculation and further logical processing.
Technical Specifications:
The rise of leakage current in Electrical Power Distribution are quite dangerous , resulting in Electrical hazards and catastrophe. Leakage Current are due to deterioration of insulations, negligence of wire man, Bad wiring, Inferior / substandard usage of Electrical Materials , ageing or endurance of Electrical environment . First and foremost importance should be given for the proper earthing of electrical net work-system. Most of the Industries, Commercial establishment and domestic application the earthing of electrical system is ignored and improper maintenance of the same.
The Earth Leakage Current are very low and are sensitive leakage current can be detected by Earth Leakage Relay and core balance current transformer. ELR detects the Leakage Current in the circuit and isolate the power supply by switching off the tripping device (circuit breaker / contactor etc).
Prok dv's make Earth Leakage Relay (ELR) MPEL series uses the state-of-the-art, Digitalmicroprocessor/micro controller based protection device to detect low level leakage dueto degradation of insulation of phase conductors or high impedance faults.The main featureof Digital microprocessor/microcontroller Earth Leakage Relay (ELR) continuous display ofearth leakage currents of the power system. The unit has immunity to external disturbancelike harmonics and transients.
Prok dv's make Digital microprocessor/microcontroller based Earth Leakage Relays (ELR) withCore Balance Current Transformer (CBCT / ZCT) are used to detect leakage currents inelectrical power systems. ELR transmits a signal to activate the trip coil of theMCCB/ACB/OCB/CONTACTOR in the event of earth leakage resulting in automatic isolationof the load. ELR have been widely used and accepted because of field adaptability andare economic.
Prok dv's make Digital microprocessor/microcontroller based Earth Leakage Relays (ELR) withCore Balance Current Transformer (CBCT / ZCT) are used to detect leakage currents inelectrical power systems. ELR transmits a signal to activate the trip coil of theMCCB/ACB/OCB/CONTACTOR in the event of earth leakage resulting in automatic isolationof the load. ELR have been widely used and accepted because of field adaptability andare economic.Prok dv's make Earth Leakage Relay (ELR) MPEL series uses the state-of-the-art, Digitalmicroprocessor/micro controller based protection device to detect low level leakage dueto degradation of insulation of phase conductors or high impedance faults.The main featureof Digital microprocessor/microcontroller Earth Leakage Relay (ELR) continuous display ofearth leakage currents of the power system. The unit has immunity to external disturbancelike harmonics and transients.
The unit has LCD for displaying the fault current (at the time of tripping) and settingvalues (curves, plug setting & TMS). The LEDs are provided for indicating power ON statusand to indicate IDMT or DEFINITE TIME or INSTANTANEOUS mode operation. Key pads areprovided for easy setting/changing of the parameters.The design is tropicalised andrugged.
Prok Dvs make STATIC OVER VOLTAGE (OV) AND UNDER VOLTAGE (UV) RELAY WITH PHASEFAILURE (SINGLE PHASING) AND PHASE REVERSAL RELAY for protection against undervoltages, over voltages, phase failure, phase reversal and unbalance voltages causeddue to transients such as inductive load switching and commutation voltage spikes etc.Prok Dvs Make STATIC OVER VOLTAGE (OV) AND UNDER VOLTAGE (UV) RELAY WITH PHASEFAILURE (SINGLE PHASING) AND PHASE REVERSAL RELAY available in five models i.e. VD-02, VD-03, VD-04, VD-05 and VD-06 for various applications. They are provided with fixed orvariable voltage settings, auto reset, definite time delay fixed or variable settings.
Prok Dvs Make STATIC OVER VOLTAGE (OV) AND UNDER VOLTAGE (UV) RELAY WITH PHASEFAILURE (SINGLE PHASING) AND PHASE REVERSAL RELAY available in five models i.e. VD-02, VD-03, VD-04, VD-05 and VD-06 for various applications. They are provided with fixed orvariable voltage settings, auto reset, definite time delay fixed or variable settings.
In motors operating at low loads, failure of any one phase causes over voltages, whichmay cause rupture of insulation leading to motor burn out. Low voltage will causesynchronous motors to come out of synchronism at 75% of rated voltage. Inductionmotors may stop when voltage falls below 70%. Over voltages may occur due todefective voltage regulator, over speeding, caused by sudden drop in load on account ofthis di-electric property deteriorates. In single phase supply low voltage may cause overload on supply cable and thermal damage to insulation of windings.
Prok dvs make Microcontroller Based Motor Protection Relay continuously monitoring Real Time Motor Current of all the Three Phases. When the Motor Current exceeds the set value Im, the relay issues a trip command after the calculated time elapse (Based on selection of trip Class). The relay visually indicating the fault trip status by means of LEDs.Two Set of potential free output changeover contact is provided in the relay C& NC and C& NO for trip circuit .The relay continuously monitors the Currents and using this data it builds Thermal replica of the Motor and monitoring the Thermal status of the Motor. This information is used to protect the Motor against Thermal over Loading.
Prok dvs brand earth leakage relay MPEL series uses the state of the art microcontroller based protection device to detect low level leakage due to degradation of insulation of phase conductors or high impedance faults.The main feature of MPEL is the continuous display of earth leakage currents of the power system. The unit is immune to external disturbance like harmonics and transients.
Earth Leakage Current give rise to generation of heat and result in progressive failure ofinsulation, which leads to earth faults sparking flashovers, deterioration of earthing and finallyresults into catastrophic fires which destroys costly equipments, gadgets and precious lives.It is therefore essential to detect earth leakage current well before they cross the thresholdlimits and isolate the circuit in the event of leakages.
Prok dv's make Digital microprocessor/microcontroller based Earth Leakage Relays (ELR) withCore Balance Current Transformer (CBCT / ZCT) are used to detect leakage currents inelectrical power systems. ELR transmits a signal to activate the trip coil of theMCCB/ACB/OCB/CONTACTOR in the event of earth leakage resulting in automatic isolationof the load. ELR have been widely used and accepted because of field adaptability andare economic.
The application of powerful microprocessors DIGITAL MICROPROCESSOR BASEDRESTRICTED EARTH FAULT RELAY (REFR) opens a new chapter for power system protectiverelaying. The digital processing of measured values and the ability to perform complexarithmetic and logic operations, give digital protection relays significant performance andflexibility improvements over their traditional analogue counterparts. Additionaladvantages - very small power consumption, adaptability, self-supervision, smallerphysical construction and selectable relay characteristics - all combine to allow theimplementation of accurate and highly reliable protection schemes at a significantlyreduced financial burden.
Applications :
In motors operating at low loads, failure of any one phase causes over voltages, whichmay cause rupture of insulation leading to motor burn out. Low voltage will causesynchronous motors to come out of synchronism at 75% of rated voltage. Inductionmotors may stop when voltage falls below 70%. Over voltages may occur due todefective voltage regulator, over speeding, caused by sudden drop in load on account ofthis di-electric property deteriorates. In single phase supply low voltage may cause overload on supply cable and thermal damage to insulation of windings.
Prok Dvs make STATIC OVER VOLTAGE (OV) AND UNDER VOLTAGE (UV) RELAY WITH PHASEFAILURE (SINGLE PHASING) AND PHASE REVERSAL RELAY for protection against undervoltages, over voltages, phase failure, phase reversal and unbalance voltages causeddue to transients such as inductive load switching and commutation voltage spikes etc.Prok Dvs Make STATIC OVER VOLTAGE (OV) AND UNDER VOLTAGE (UV) RELAY WITH PHASEFAILURE (SINGLE PHASING) AND PHASE REVERSAL RELAY available in five models i.e. VD-02, VD-03, VD-04, VD-05 and VD-06 for various applications. They are provided with fixed orvariable voltage settings, auto reset, definite time delay fixed or variable settings.
Prok dv's make Static Earth Leakage Relay (ELR) with Core Balance Current Transformer ( CBCT/ ZCT) are used to detect the leakage current in an Electrical Power System. Static EarthLeakage Relay (ELR) Transmits a signal to activate the trip coil of the MCCB/ACB/OCBCONTACTOR in the event of Earth leakage, resulting in automatic isolation of the electricalpower system. Static earth leakage relay (ELR) and core balance current transformer (CBCT /ZCT) have been widely used and accepted because these have field adaptability and areeconomic.
Prok Dvs an ISO 9001:2008 Company indigenously develops the power system protection relays and panel meters for power system. P based Zero sequence voltage relays are the state of the art design, to monitor and protect the costly equipments against unbalance voltages.The Relay Continuously monitoring all the three phase Line to Line Voltages, if any abnormal condition persists in the system internal Relay activated with predetermined set value of definite time.The Unit Displays Line to Line Voltages on LCD display, Healthy and Fault /Trip status Information through LED Display.