Moulded case circuit breakers

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Rudolf Weaver
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1 Moulded case circuit breakers

3 CONTENT Range 4 Protection Releases 5 Salient Features 8 Accessories, 4 Technical data 2 Time Current Characteristics 5 Overall Dimensions 7 SN4 SN3 SN2 SN 3

4 RANGE Moulded case circuit breakers Iskra are assurance for your electrical installations and equipment. They are designed to reliably protect all installation system against overloads and short-circuits. You can choice: - Range from 6 A to 600 A - 3-pole or 4-pole versions - 30 ka/36 ka/50 ka/70 ka breaking capacities - protection with thermal-magnetic and electronic release - wide range of internal and external accessories - KEMA and CB approved SN Rated Current 20, 25, 32, 40, 50, 63, 80, 0 A Release Thermal-Magnetic SN2 Rated Current 63, 80, 0, 25, 60, 200, 250 A 40, 63, 0, 60, 250 A Release Thermal-Magnetic Electronic SN3 Rated Current 320, 400, 500, 630 A 63, 60, 250, 400, 630 A Release Thermal-Magnetic Electronic SN4 Rated Current 800, 00, 250, 600 A Release Electronic BREAKING CAPACITIES 4

5 PROTECTION RELEASES Thermal-Magnetic Release Features of Thermal-Magnetic Release Adjustable protection overload settings Adjustable protection short-circuit settings True RMS sensing No contact with live parts Protection Settings SN SN2&SN3 Overload 80 % - 0 % In 80 % - 0 % In Short circuit 9 In (fixed) 6 - In Earth fault external Electronic Release Features of RC Electronic Release Overload protection with inverse time delay Short circuit protection with selectable time delay 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 protections Protection mode can be ON / OFF True RMS sensing Instantaneous over ride protection In (A) RC Overload (Phase) From 40 to 600 A Current setting, Ir (Ir = xin) 0,4 to,0 in steps of 0, Time delay, tr (Inverse) Protection mode Current setting, In (Intrl = xir) Protection mode Current setting, Is (Is = xir) Time delay, ts Protection mode Overload (Neutral) Short Circuit s at 6 Ir On / Off 0,5, 0,75 and,0 Intrl Inverse s at 6 Intrl / Fixed 200 ms On / Off, 5, 4, 6 & 8 Ir / 0 ms On / Off Instantaneous Over ride Current setting, Ip 2 In for SN In for SN2-250, SN3-600 and SN4-250/600 Earth Fault Current setting, Ig 0,2 to 0,5 In steps of 0, Time delay, tg 0 / 200 ms Protection mode On / Off 5

6 PROTECTION RELEASE Electronic Release Features of RC20 - Communication Capable Power on LED Backlit LCD display Scroll buttons Push to trip button All features of RC release are incorporated Metering for current parameters Protection against unbalanced load / single phasing I ² t protection Neutral protection Cold load protection User friendly navigation system Selfpowered RC20 6 Rated Current In A Overload (Phase) For 400 A & 630 A Current setting (A), Ir (Ir = xin) 0,4 to,0 in steps of 0, Time delay, tr (s) (Inverse) Protection mode 3, 6,, 5, 30 at 6 Ir On / Off Preset trip alarm setting 0,8 to,0 Ir in steps of 0,05 Thermal memory Current setting (A), Ir Time delay tn (s) at 6 Ir Protection mode Overload (Neutral) On / Off 50 %, 75 %, 0 % In As per overload On / Off Preset trip alarm setting Intrl 0,8 to,0 Ir in steps of 0,05 Short Circuit Current setting (A), Is,5 to 8 Ir in steps of 0,Ir Time delay ts (ms) For - I²t OFF 20 to 200 in steps of 20 Protection mode Preset trip alarm setting Cold load pickup Instantaneous Protection mode Cold load pickup Current setting (A), Ip Instantaneous Instantaneous Over ride Earth Fault For - I²t ON 60 to 200 in steps of 20 On / Off 0,8 to,0 times Is in steps of 0,05 Is Enable / Disable,5 to 8 In in steps of 0,5 In On / Off Enable / Disable 2 In for SN In for SN3-630 Current setting (A), Ig 0,2 to 0,5 In steps of 0, In Time delay (ms), tg 0,, 0,2, 0,5,, 3 s Preset trip alarm setting 0,8 to,0 Ig in steps of 0,05 Protection mode Cold load pickup On / Off Enable / Disable

7 Protection Release Additional Features of RC20 Current unbalance Current setting (A) xin % to 0 % In in steps of 5 % Time delay (s) to in steps of 0,5 Protection mode On / Off Cold load pickup Enable / Disable Temperature rise Alarm / Trip At 80 ºC / At 0 ºC Metering Current Phase, Neutral and Earth Display Backlit LCD 7

SALIENT FEATURES Faster Tripping: The unique speed contact system accelerates the opening of contacts during short circuit. This ensures faster tripping an ultimate current limiting feature.

Mechanical Anti-reclosing: This unique feature ensures that under short circuit conditions, the contacts open and latch even before the release gives a trip command to the mechanism.

8 SALIENT FEATURES Faster Tripping: The unique speed contact system accelerates the opening of contacts during short circuit. This ensures faster tripping an ultimate current limiting feature. The result-very low let-through, cut-off current and fault clearing time. Mechanical Anti-reclosing: This 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 bounce. Low watt loss: The entire current carrying path is optimally designed to achieve very low watt loss. Positive Isolation: The MCCB knob indicates the true position of the contacts. Double Insulation: 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 insulation. Marking: Marking ensures use of superior engineering plastic, meeting all requirements of flammability and glow wire test. 8

9 SALIENT FEATURES Common Internal accessories: The internal accessories remain same across SN2 / SN3 / SN4 range* and they are easy to install click fit type. *Except under-voltage release No side bias: Internal accessories can be mounted on the either side. LINE LOAD Terminal finger proofing: Front terminal plates conceal the terminals to prevent human contact thus achieving complete finger proofing. Terminal shrouding: Terminal shrouds cover spreader terminals preventing human contact with terminals (TS available for SN). Release shrouding: Release is shrouded from the front thus preventing tampering by unauthorized person. Safer release adjustments: No live parts are in contact during release adjustments. No load line bias: Either side of MCCB terminal can be used as load or line. Common front adjustments for Protection release: Overload & short circuit setting can be adjusted from front using a common knob for all the poles. Visibility: Push to trip button and release ratings are visible even when release plate is fitted. 9

10 Accessories Internal Accessories Range of MCCBs are offered with click-fit type, easily installable internal accessories. There is no need to open main cover and no live parts are accessed during installation. Any accessory can be fitted on any side enhancing flexibility (except under-voltage release). Auxiliary Switch List of Internal Accessories Auxiliary Switch 2 change-over (AUX2-SN, AUX2-SN2/3/4) Trip Indicator change-over (TA-SN2/3/4) & 2 change-over (TA2-SN) Auxiliary Switch & Trip Indicator + change-over (AUXTA-SN, AUXTA-SN2/3/4) Shunt Release (A-SN, A-SN2/3/4) Under Voltage Release (U-SN, U-SN2, U-SN3, U-SN4) MCCB with mid cover opene & Internal accessories fitted. External Accessories Rotary Operating Mechanism The rotary operating mechanism (ROM) for MCCBs are available in Direct & Extended versions. Direct rotary handle ( MCCB mounted: ROM-SN, ROM-SN2, ROM-SN3). These versions are available for the entire family of MCCBs. These ROMs can be supplied with key lock for SN2 and SN3 frames Extended rotary handle ( Panel mounted: ROM OS-SN, ROM OS-SN2, ROM OS-SN3, ROM OS-SN4) ROM mounts directly on MCCB without removal of midcover Door interlock in OFF condition with padlock feature Clear ON/OFF/TRIP indication Clear view of MCCB rating label with ROM mounted Direct access to push to trip button with ROM mounted IP 54 degree of protection with extended rotary handle Keylock version available Door interlock in ON position, with defeat facility Auto restoration of door interlock

Accessories Electrical Operating Mechanism Features Clear ON/OFF/TRIP indication Safety interlock: EOM will not operate if - EOM cover is open - EOM is not properly fixed on MCCB Permits manual

11 Accessories Electrical Operating Mechanism Features Clear ON/OFF/TRIP indication Safety interlock: EOM will not operate if - EOM cover is open - EOM is not properly fixed on MCCB Permits manual operation, if required Padlock facility for locking in OFF position Easy access to the protection setting on the MCCBs Electrical Operating Mechanism (EOM) Applications Facilitates remote operation of MCCBs Facilitates use in process automation applications and auto change over schemes Technical Specifications EOM-SN2 Type Designation EOM-SN3 Operating Voltage 24, 48 VDC, 240 VAC * Operating Time SN2 <2,2 s, SN3 <3,3 s *240 VAC available on request Specifications SN2 SN3 24 VDC - 48 VDC 24 VDC - 48 VDC Current ar rated load (A),32 0,66 2,2, Input VA (W) Full load speed (rpm) Full load torque (gm-cm)

12 Type SN - 0 SN2-250 No. of Poles 3 3/4 Rated Current I n A 20, 25, 32, 40, 50, 63, 80, 0 40, 63, 80, 0, 25, 60, 200, 250 Standards IEC/EN Approvals KEMA, CB KEMA & CB only for MCCB s with RC Rated Operational Voltage U e V Rated Insulation Voltage U i V Rated Impulse withstand Voltage U imp kv 6 8 Rated Frequency Hz 50 / / 60 Ambient temperature C -5 C to +55 C Storage temperature C -35 C to +70 C Reference Ambient Temperature C Utilisation Category A A Versions Rated Ultimate S.C. Breaking Capacity 230/240 V 400/45 V Standard Standard SN2-250S High SN2-250H Extra High SN2-250L / V V V I cu ka V V DC (3 poles in series) L/R <5 ms 500 V DC (3 poles in series) Rated Service S.C. Breaking Capacity I cs ka 50 % I cu 0 % I cu Endurance Mechanical Electrical (,0 In) Power dissipation per pole W 8 2 Terminal Capacity Standard With Spreader Links cable (lug) link cable (lug) link mm 2 mm 2 mm 2 mm 2 35 (width <7 mm) (width <7 mm) 50 (width <22 mm) (width <22 mm) Box Clamp Cu. Cable mm Dimensions (W x D x H) 3 / 4 Poles mm 75 x 60 x 30 5 / 40 x 96 x 79 Weight 3 / 4 Poles kg 2,5 / 3,3 A C C E S S O R I E S Internal External *One time fitting, non-detachable type x x 6 Auxiliary Switch or 2 change-over or 2 change-over Trip Indicator or 2 change-over change-over Auxiliary Switch & Trip Indicator + change-over + change-over Shunt Release V AC 50 / 60 Hz - 45 V AC 50 / 60 Hz, V DC Under-voltage Release 240 V AC 50 Hz V AC 50 / 60 Hz Rotary Operating Mechanism Electrical Operating Mechanism X Earth Fault Release Machanical Interlock X Terminal Shrouds X Spreader Links Box Clamp Pad lock * X

13 SN3-400/630 SN4-250 SN4-250/600 3/4 3/4 3/4 320, 400, 500, , , 600 IEC/EN KEMA & CB only for MCCB s with RC KEMA, CB KEMA & CB only for 250 A / / / 60-5 C to +55 C -35 C to +70 C A A A Standard SN3-400S, 630S High SN3-400H, 630H Extra High SN3-400L, 630L Standard SN4-250S High SN4-250H Standard SN4-250S, 600S High SN4-250H / 20 / / % I cu 0 % I cu 0 % I cu / / / / x 5 2 x 85 2 x 40 x x 40 x 5 2 x 30 2 x 60 x x 40 x 5 2 x 30 2 x 60 x / 83,5 x,5 x x 370 x x 370 x 79 6 / 7,8 7 / 2 7 / 2 or 2 change-over or 2 change-over or 2 change-over change-over change-over change-over + change-over + change-over + change-over - 45 V AC 50 / 60 Hz, V DC - 45 V AC 50 / 60 Hz, V DC - 45 V AC 50 / 60 Hz, V DC V AC 50 / 60 Hz V AC 50 / 60 Hz V AC 50 / 60 Hz X X Inbuilt protection with Electronic release Inbuilt protection with Electronic release Inbuilt protection with Electronic release X X X X X X X X X X 3

Accessories Mechanical Interlock Schemes (M INT) Mechanical Interlock kit Features For 3-pole & 4-pole versions Suitable for SN2 & SN3 frames M INT with base plate Earth fault release (EFR) Earth

14 Accessories Mechanical Interlock Schemes (M INT) Mechanical Interlock kit Features For 3-pole & 4-pole versions Suitable for SN2 & SN3 frames M INT with base plate Earth fault release (EFR) Earth fault currents: - up to 200 A - from 250 A to 400 A - from 630 to 800 A Ordering data for MCCB Example: SN2-250S3 63A 36kA In SN Type S - Version 3 - No. of poles 63A - Rated current 36kA - Breaking capacity In - Kind of release (In, RC and RC20) 4

15 Time - Current Characteristic Curves Thermal-Magnetic Release SN - 0 SN Time in Seconds Time in Seconds Multiples of Current Multiples of Current 000 SN3-400/ Time in Seconds Multiples of Current 0 2 5

16 Time - Current Characteristic Curves Microprocessor Release SN2-250, SN3-630 and SN4-250/ RC SN Time in Seconds Time in Seconds 0. 0% In 40% In 0. 0% In 40% In Multiples of Current (Ir) Multiples of Current (Ir) SN RC20 SN sec 5 sec sec 6 sec 3 sec sec 5 sec sec 6 sec 3 sec Time in Seconds Time in Seconds 0. 0% In 40% In 0. 0% In 40% In Multiples of Current (Ir) Multiples of Current (Ir) 2 4

17 Overall Dimensions CABLE TERMINAL SCREW: M6 20 SN MCCB MOUNTING SCREW : M3-2Nos SUITABLE FOR 35 x 7.5 TOP HAT RAIL MOUNTING Mounting & Door Cutout Details SN with Spreader Links Note: Spreaders Optional All dimensions are in mm. 7

18 Overall Dimensions SN ON TRIP OFF Mounting & Door Cut-out Details Terminal width = 25.5 mm SN P with Spreader Links SN P with Spreader Links 8 All dimensions are in mm.

19 Overall Dimensions SN3-400/ A ON TRIP OFF B SN3-400/630 3P with Spreader Links Type SN3-400 SN3-630 A 39 4 B C D E F 3 SN3-400/630 4P with Spreader Links All dimensions are in mm. 9

20 Overall Dimensions SN4-250/600 MCCB SN4-250/600 with Spreader Links 20 *A = 6 mm for SN4 800 A and 20 mm for SN4 00/250/600 A All dimensions are in mm.

21 Rom Door CUT-out details Direct ROM door cut-out detail L5 7 L4 N L3 L2 L L = Mounting depth L2/L3 = Panel cut-out L4/L5 = Breaker mounting refer Type L L2 L3 L4 L5 SN 96, SN SN Extended ROM door cut-out detail REFER PANEL CUT DETAILS L2 I L3 I 76 N I 4 L L L = 275 mm L = minimum panel depth L2 = cut the shaft to the required length All dimensions are in mm. Type L L2 L3 L4 L5 * SN 60 L-9 7,5 69,5 394 SN2 202 L SN3 233 L SN4 302 L * Max. depth 2

22 Overall Dimensions Overall Dimensions with EOM A B ON C TRIP OFF Type Dimensions in mm A B C For SN2 EOM ,3 For SN3 EOM ,5 47,3 DN2 M INT Kit DN3 M INT Kit 22

24 Iskra MIS, d. d. Ljubljanska c. 24a SI Kranj, Slovenia Phone: +386 (0) Fax: +386 (0) Published by: Iskra MIS, d. d., Version., Kranj, December 2009 Design: Nimbus d.o.o.

Moulded Case Circuit Breakers

L&T SWITCHGER S F E & S U R E imp: k U 8 V Ue V, 60Hz. :4 0/ Ic u : 70k, I :0%I C T: cs cu D2 S IS 3947-2 IEC 60947-2 E 60947-2 - Moulded Case Circuit Breakers bout us Larsen & Toubro is a technology-driven