Moulded Case Circuit Breakers

1 SAFE & SUREL&T SWITCHGEARM oulded Case Circuit Breakers14 E4 E9IS 397-2 IC 6097-2 N 6047-2C:A ATUV60Hz:415, 50/.e U8V:kipmI7k :0A, uc I:100%IsccuDN2250S-About us switchgear Factory, MumbaiLarsen & Toubro is a technology-driven USD billion 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 , which forms 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.

2 With over four decades of experience in this field, the Company today enjoys a leadership position in the Indian market with growing presence in international markets. It offers a complete range of products including controlgear, powergear, motor starters, energy meters, wires and host of other accessories. Most of our product lines conform to international standards, carry CE marking and are products conform to international standards, carry markings and are & CB certified. The range, a new generation of MCCBs, stands out due to its state-of-the-art design, contemporary user-friendly features, wide choice of protective releases, ergonomics, aesthetics and range complies with the latest standards like IEC 60947-2, EN 60947-2 & IS range is specially designed for tropical conditions, ensuring reliable performance at high ambient and humid range is designed to meet the changing needs of users after extensive analysis and user feedback.

3 The range can satisfy the most demanding system range, complimented by a wide range of accessories, offer total solution to customer applications ensuring operational safety, reliability and Protection Releases Salient Features Accessories Widest Range Time-Current Characteristics Overall Dimensions1257111215DN2DN3DN4 Contents1 The Complete RangeFeatures From 63A to 1250A3 Pole & 4 Pole Choice of 36kA/50kA/70kA breaking capacitiesWith protection releases in Microprocessor, Thermal-Magnetic and only MagneticMCCBs for distribution and SD versionsManual, rotary or motorised versionsWide range of internal and external accessories Breaking Capacities 36kA50kA70kAS (35kA) HLDNSOld TypeDesignationNew TypeDesignationBreaking capacityRated CurrentReleaseRated CurrentReleaseRated CurrentRelease800, 1000, 1250 AMicroprocessor63, 80, 100, 125, 160, 200, 250 AThermal-Magnetic320, 400, 500, 630 AThermal-Magnetic 40, 63, 100, 160, 250 AMicroprocessor63, 160, 250, 400, 630 AMicroprocessorDN2DN3DN4 Note.

4 Since there is no change in the constructional aspect of the MCCBs, the product certification with old designation remain valid with new type designation. 2 Protection ReleasesCurrent setting, Ir (Ir = XIn)Time delay, tr (Inverse)Protection modeCurrent setting, In (Intrl = XIr)Protection modeCurrent setting, Is (Is =XIr)Time delay, tsProtection modeCurrent setting, IpCurrent setting, IgTime delay, tgProtection mode OFF, to in steps of sec at 6 IrON / , & IntrlInverse 10 sec at 6 Intrl / Fixed 200msON / , 4 & 6Ir Inst. / 100 msecON / OFFDN2-8In, DN3-400-12In, DN3-630-8In, to steps of / 200 msecON / OFF From 63 to 1250 ARated Current In (A)

5 Thermal-Magnetic ReleaseMicroprocessor Release3452176 Features of RC10 Microprocessor Release j k l m n o p Overload protection with Short Circuit protection with selectable time delay Instantaneous over ride protection Earth fault protection with selectable time delay Neutral protection with selectable time delay Push to trip button Port for release testing Power ON LED Self powered protectionsTrue RMS sensinginverse time delay *Except for 630A MCCBs. Setting from 3 - 6 In available on of Thermal-Magnetic Release Adjustable overload settings Adjustable short Circuit settingsTrue RMS sensingNo contact with live partsProtectionOverloadShort Circuit *Earth fault DN2 & 80% - 100% In6 - 10 In*External DN3 Settings RC10 Overload (Phase)Overload (Neutral)Short CircuitInstantaneous Over rideEarth FaultProtection Releases3 Current setting (A), Ir (Ir = xIn) Time delay, tr (s) (Inverse)Protection modePreset trip alarm settingThermal memoryCurrent setting (A), IrProtection modeCurrent setting (A)

6 , IsTime delay ts (ms)Protection modePreset trip alarm settingCold load pickupInstantaneousProtection modeCold load pickupCurrent setting (A), IpCurrent setting (A), IgTime delay (ms), tgPreset trip alarm settingProtection modeCold load pickup Rated Current In (A) to in steps of , 6, 10, 15, 30 at 6 IrON / to in steps of / OFF50%, 100% InON / , 4, 6Ir For I t OFF 20 to 200 in steps of 20 For I t ON 60 to 200 in steps of 20ON / to times Is in steps of IsEnable / to 8In in steps of / OFFE nable / DisableDN2-8In, DN3-400-12In, DN3-630-8In, to steps of , , , 1.

7 3 to Ig in steps of / OFFE nable / Disable From 63 to 630 AMicroprocessor ReleaseCommunication using RS 485 Power on LEDB acklit LCD displayScroll buttonsPush to trip buttonAll features of RC10 release are incorporated Metering for current parameters Protection against unbalanced load / single phasing 2It protectionNeutral protectionCold load protectionUser friendly navigation systemSelf poweredMODBUS RTU protocolFeatures of RC20 - Communication Capable RC20 Overload (Phase)Overload (Neutral)Short CircuitInstantaneousInstantaneous Over rideEarth Fault* To establish communication with computer every MCCB with RC20 will require a communication Releases4 Additional Features of RC20 Current unbalanceTemperature riseMeteringCommunication*Current setting (A) xInTime delay (s)

8 Protection modeCold load pickupAlarm / TripCurrentDisplayProtocolLink usedEvent recordsTrip historyTrip counter record10% to 100% In in steps of 5%1 to 10 in steps of / OFFE nable / DisableAt 80 C / At 100 CPhase, Neutral and EarthBacklit LCDMODBUS RTURS 485 Pickup, Trip, Alarm upto 128 records-volatile memory Last 5 trips records - non volatile memory Counts for total number of tripsState-of-the-art technology5 Faster tripping Mechanical Anti-reclosing Low watt lossThe unique speed contact system accelerates the opening of contacts during short Circuit . This ensures faster tripping an ultimate current limiting feature.

9 The result-very low let-through, cut-off current and fault clearing unique feature ensures that under short Circuit conditions, the contacts open and latch even before the release gives a trip command to the mechanism. This avoids contact re-closing and entire current carrying path is optimally designed to achieve very low watt loss. Positive Isolation Double Insulation MarkingThe MCCB knob indicates the true position of the internal accessories are housed in insulated casings to ensure first level of insulation. When the front cover is opened for the fixing of internal accessories, the MCCB is totally insulated ensuring the double marking ensures use of superior engineering plastic.

10 Meeting all requirements of flammability and glow wire testing path is optimally designed to achieve very low watt Grip on handle State-of-the-art technology* Except under voltage release 6 Common Internal accessoriesThe internal accessories remain same across DN2 / DN3 / DN4 range* and they are easy to install snap fit type No load line biasEither side of MCCB terminal can be used as load or lineLINELOAD Terminal finger proofing Release shrouding Safer release adjustments Front terminal plates conceal the terminals to prevent human contact thus achieving complete finger proofingRelease is shrouded from the front thus preventing tampering by unauthorized personNo live parts are in contact during release adjustments Common front adjustments for protection release VisibilityOverload & short Circuit setting can be adjusted from front using a common knob for all the polesPush to trip button and release ratings are visible even when release plate is fittedIn 250 AAuxiliary Contact Auxiliary Contact 1 C/OAuxiliary Contact 2 C/OTrip Alarm ContactAuxiliary & Trip Alarm ContactShunt ReleaseUnder Voltage Release (suitable for)