Air Circuit Breakers - Larsen & Toubro

1 Air Circuit BreakersLarsen & Toubro is a technology-driven company that infuses engineering with imagination. The Company offers a wide range of advanced solutions in the field of Engineering, Construction, Electrical & Automation, Machinery and Information Technology. L&T Switchgear, a part of the Electrical & Automation business, is India's largest manufacturer of low voltage switchgear, with the scale, sophistication and range to meet global benchmarks. With over five decades of experience in this field, the Company today enjoys a leadership position in the Indian market with a growing international presence. It offers a complete range of products including powergear, controlgear, industrial automation, building electricals & automation, reactive power management, energy meters, and protective relays.

2 These products conform to Indian and International Standards. Switchgear Factory, AhmednagarSwitchgear Factory, MumbaiSwitchgear Factory, VadodaraABOUT US1L&T s Air Circuit Breakers (ACBs) are specially designed for extreme tropical conditions and have a proven track record of more than 45 years. Presently more than 5,00,000 Air Circuit Breakers supplied by L&T are being used for diverse applications. The Air Circuit Breakers provide technologically driven solutions to meet customer feature of lcu=lcs=lcw for 1 second across the entire range. This ensures complete selectivity for system with time based design to perform in extreme tropical conditions. Typical site conditions like high ambient temperature, humidity and dusty environment are best handled by ACBs without compromising on performance and selectivityPerfect for Indian conditionsOptimal compactnessWidest choice of over current protection releasesElegant design & rugged constructionRange to meet every customer s needDesigned to ensurelLow inherent temperature riselAdequate interface clearanceslAdvance micro-controller based with option of communication & metering-SR71lMicro processor based releases-lThermo-magnetic release-DN1lCommon door cutout for entire rangelLeft aligned cutout for all ratingslUniform height and depth for ACBs upto 4000 AmpVarious options to choose fromlBreaking capacity from 50kA to 100kAl3 Pole or 4 Pole configurationlFixed or Drawout versionlAuto or Manual reset

3 MechanismlIndependent manual or stored energy type, manual or electrically operated mechanismlDifferent terminal orientations : Flat, Horizontal and VerticalSR18/SR18G/SR21i/SR18G & with displaySR18 GiAIR Circuit BREAKERS2 New user friendly featureUser friendly featuresSafetyConformance to standardslOperational ll marked for C, S1 & H rangeslSuperior quality engineering grade plastics used for insulation purpose; conforms to Glow wire test (Ref: IEC 60695-2-1)lIn-built mechanical anti-pumping lIn-built rating error preventor in drawout ACBs ensure correct rating of drawout portion in corresponding cradlelSafety shutters prevent accidental contact with live cradle terminalslVariety of Safety Interlocks lEasily removable arc chutes without use of any toollOperating voltage ranges from 10% Un to 110% Un for shunt release ensures intentional tripping even at high voltage drops during short-circuitllIEC - 60947 (Part 1 & 2)lIS/IEC - 60947 (Part 1 & 2)

4 LIEC 60695 - 2 - 1lBS EN 60947 - 2 Counter will be standard offering from rating 4000A and abovein DN1 releaseJaws on breaker facilitate ease of maintenance & replacement of contact jawsto prevent auto-reclosing of ACB on persisting faultsTransparent safety shutter offers easy inspection of cradle contacts & reduces the maintenance time690V Application for C Power ACBS olution for 690V application available in C Power Family. For further details please consult our nearest branch for Corrosive EnvironmentSolution for harsh/corrosive environment available in C Power Family. For further details please consult our nearest branch accessible over current release settings, telescopic racking handle and various racking interlocks; no need to open the panel doorlUnique Maintenance position in drawout type ACBs to facilitate maintenance & inspection without removing ACB from the panellMultitap CTs for enhancing protection range lWide variety of Amperemetric and Voltmetric releaseslFully rated neutral pole for the entire rangelLockable sliding shutters to prevent unauthorized access to TRIP and CLOSE push buttonslCan be used as an ON / OFF Load IsolatorlExtendable Electrical Life: - By replacing the arcing contacts at site, for all ratings - Without changing pole assemblylProgrammable SICs.

5 Auxiliary contacts in drawout ACBs are programmable for only Service, Only Test, Test and Service, and All PositionslProtection releases are easily interchangeable at sitelFacility for site conversion of manually operated ACBs to electrically operated ACBsSpecial applications3 Breaking capacities:CN-CS : S1CN-CS : E50kA50kA50kA50kA50kA50kA50kA50kA630A400 ACN-CS : CCN-CS : HCN-CS : H2CN-CS : H1/HFrame-150kA50kA50kA50kA65kA65kA65kA6 5kA800A1000A1250A 1600 AIcu = Ics = Icw for 1 secFrame-1 Frame-250kA50kA50kA50kA50kA60kA60kAFrame -3 Frame-255kA60kA75kA75kA75kA100kA2000A250 0A3200A75kA100kA95kA95kA4000A5000A6300 AFrame-4 Rated Current50kAFrame-1 RANGE4 NEWS150-50-5050-105-C3 Electrical life = Mechanical life. However, arcing contacts need to be replaced depending upon wear & Please consult * Please consult us for application at dc voltages & higher operational voltage upto 690V H2 range has replaced old HO rangeE350-50-5050-105-S150-50-5050-105-C 3 326414431 Rating (A)Type DesignationRated current (A) at 50 CRated operational voltage (V), 50/60 HzRated insulation voltage (V), 50/60 HzNo.

6 Of poles380/415/500V690V380/415 sec1 sec3 sec380/415/500V690 VFixedDraw out400E4004151000350-50-5050-105-E350-50 -5050-105-S13/450-50-5050-105-S150-50-50 50-105-E350-50-5050-105-In*UeUiIcuIcsIcw Icm63041510008008004151000C3 Pole4 Pole3 Pole4 PoleHWDHWD4444060BP4060BP4060 BPRated impulse withstand voltageof main Circuit (kV)Rated making capacity50/60Hz (kA peak) impulse withstand voltageof aux. Circuit (kV) PPPP200008000 468399487587 UimpPPPP8000 PxPx6000385 opening time (ms)Typical closing time (ms)Utilization categorySuitability for isolationFixedDraw outManualElectrical Electrical & Mechanical life (operating cycles) Electrical life without maintenanceDimensions (in mm) 8888812121220000 Rated short timewithstand capacity50/60Hz (kA rms)Rated service short Circuit breakingcapacity 50/60Hz (kA rms)Rated ultimate short Circuit breakingcapacity 50/60Hz (kA rms)

7 394326414431468399487587 TECHNICAL DATA SHEET655000C500041510003/495D95D9595D209 D6300C630041510003/495D95D9595D209D2500- ---5839131182691xPPPPxPPP2500----5839131 1826914060B1212444060BP5000 5000C70D70D7070D154 DNEWNEW630400/630 PROTECTION RELEASES DN1 thermo-magnetic release offers reliable protection against overload, short- Circuit and earth faults via multitap Cts. with ambient temperature compensation 00from -5 C to 50 Release Type - DN1 Overload Protection (Phase)lUnique individual phase O/L setting adjustment helps to avoid the nuisance tripping of ACBs in unbalance load condition (due to single phase loads) on distribution transformer. Overload pick-up range: to 1 times InShort- Circuit ProtectionlTwo taps on CTs (working as rating plug) help in selecting operating threshold.

8 Short- Circuit pickup range: to times In with minimum impulsion time of 25 ms to prevent nuisance tripping due to transientsEarth Fault ProtectionlOffered with auxiliary earth fault release module. Earth-fault pick-up range: to times InProtection 7 Microprocessor Based Release - SR18 & SR18 GSalient FeatureslSelf-powered lComprehensive protection- SR18: and Short- Circuit - SR18G: , Short and Earth fault protectionlTrue Hot & Cold characteristics lMulti-state LED to indicate - Power ON condition - Test modelIndividual fault annunciation through LEDslTest kit (SRT-2) available for testing the releaseslConformance to EMI/EMC standards & true RMS sensingOverload (Phase)Overload (Phase)& switchable thermal memoryAN1 module for remote fault indication through LEDs with changeover contact for each kind of faultlProvision for Self-diagnostic test (without tripping the breaker )-Circuitl2 to 10 times InSteps : 2, 3, 4, 5, 6, 7, 8, 9, 1020 ms to 600 msSteps.

9 20, 60, 100, 160, 200,260 , 300, 400, 500, 600 ms-Type ofProtectionOverload (Phase)Short-CircuitInstantaneous Earth Fault*Setting RangePick-up CurrentTime DelayIr - to times InSteps : , , , , , , , , , to times InSteps : , , , , to 400 msSteps : 100, 200, 300, 400 ms & OFF6 & 12 sec at 6 times lr* Available in SR18G release only In 3 phase, 4 wire system, Neutral CT is required for earth fault Featuresl Test-kit for SR18G/SR18Gi with displayl Operates from 230V AC supply & generates single-phase voltage test signalsl Tests the release for- Phase fault for overload, short- Circuit and instantaneous protection- Earht fault protectionl Test current multiples- For phase faults: In, In, In, In, 11 In, 13 In- For earth fault.

10 In, In, In, Inl Five 7-segments LED display indicates the trip time (two places after decimal)PROTECTION RELEASES Test-kit UN-ES18 Microprocessor Based Release - with display SR18 GSalient FeatureslllllllllllSelf powered &True RMS sensingTrue Hot & Cold characteristics & switchable Thermal MemoryUnique 3 line O-LED display (Organic LED)Offers comprehensive protection against Overload - Phase & Neutral, Short- Circuit , Instantaneous, Earth Fault Settable Overload delaySettable Instantaneous setting with provision of OFF 2I t ON/OFF for Short- Circuit and Earth Fault protectionIndividual Fault LED indication Provision for Self-diagnostic testConformance to EMI/EMC standardsTesting through Test kitlSeparate version with Zone Selective Interlocking (ZSI) - SR18Gi with displayPick-up currentTime DelayType ofProtectionOverload (Phase)Short-CircuitInstantaneous Earth fault* Overload (Neutral)Setting to 30 sec at 6 times IrSteps : , , , 2, , 6, 12, 17, 30 secSame as Overload (Phase)2l t ON = , , , , sec2l t OFF = , , , , , sec2l t ON = , , , sec2l t OFF = , , , , 1 secIr - to times InSteps : , , , , , , , , , 1IN -50% to 200% times IrSteps : 50%, 100%, 150%, 200%2 to 16 times InSteps : 2, 3, 4, 6, 8, 10, 12, 14, 16, OFF2 to 10 times InSteps : 2, 3, 4, 5, 6, 7, 8, 9, to times InSteps.