At the cutting edge of current control

CG International Division

AIR CIRCUIT BREAKERS

AIR CIRCUIT BREAKERS Crompton Greaves LH Series Air Circuit Breakers employ the latest state of the art technology and fully conform to IEC /Indian standards. The range extends from 200A to 4000A for AC & DC applications. The ACBs are designed for high degree of standardisation in Panel building, total operator safety and economical maintenance. 1

Next Page

RANGE SIZE RATINGS ( A)

II 200 400 630 800 1000 1250 3P / 4P

III 1600 2000

IV 2500 3200

V 4000

3P / 4P

3P / 4P

3P

Fixed Drawout

Fixed Drawout

Fixed Drawout

Fixed Drawout

RELEASE

Manual Electrical Thermal Magnetic STATIC

Manual Electrical Thermal Magnetic STATIC

Manual Electrical Thermal Magnetic STATIC

Manual Electrical Thermal Magnetic

BREAKING CAPACITY lic = lcu AT 415V AC 3 Ph

50 KA

NO. OF POLES EXECUTION

MECANISM

65KA

2

80A

Back - Next Page

80KA

THERMAL MAGNETIC PROTECTION OVERLOAD PROTECTION Overload protection is provided through CT operated continuous, variable bimetallic overload unit. By adjusting the CT tapsand varying the setting of overload unit, current setting can be varied from approximately 25% to 100% ( For exact details, refer technical data sheet ). SHORT CIRCUIT PROTECTION : Short circuit protection is provided through an armature type direct acting magnetic release. During short circuit fault, the armature is instantaneously attracted, in-turn tripping the ACB through delatching of trip shaft. This design ensures faster tripping time (less than 2 cycles). Short circuit pick up level is adjustable continuously by knobs provided on the front of the ACB. For 4000A ACB trippping is through series trip coil & is fixed at 5 times the CT TAP set current. TIME DELAYED SHORT CIRCUIT TRIP (OPTIONAL) : To achive discrimination when used as an incomer, a time delayed S/C trip can be provided. This consists of a S/C release fitted with microswitch and RS unit supplied separately. RS unit provides the time delay and is available in two versions - with fixed time delay ( 0.04 sec. ) and with adjustable time delay ( 0.04 to 0.46 sec. ) During fault, the S/C release operates the micro switch activating the RS unit. The RS unit trips the ACB through the tripping coil after the set time delay. EARTH FAULT PROTECTION ( OPTIONAL) : Earth Fault Protection is also offered as an optional feature. This protection is achieved through Earth Fault ( E/F ) relay. The E/F relay senses the earth fault and gbives a trip command to the ACB through shunt trip. The sensitivity of the E/F relay is adjustable between 10% and 40% of the ACB rating. The E/F telay is available in both versions - 3 phase 3 wire and 3 phase 4 wire. As a standard, LED trip indication is provided on the E/F relay. FAULT ANALYZER : LH series thermal magnitic ACBs upto 3200A are fitted with mechanical trip indications for overload, phase to ground fault, two phase or two phase to ground fault and three Phase or three Phase to ground fault. Electrical indication facility for O/L trip is also provided as standard. Electrical indication facility for phase to ground fault, two phase or two phase to ground fault and three phase or three phase to ground fault can be provided on request. LH 4000 ACBs are provided with mechanical trip indications for overload, short circuit & ;facility for O/L trip electrical indication as standard feature. Electrical indication facility for AC under voltage trip is available on entire range of ACBs on request. STATIC PROTECTION Air Circuit Breakers with static protection come with a Solid Protection Relay - The CSR. The relay comes as an integral part of LH series ACBs from 200 Amp to 3200 Amp. and does not require any external supply for tripping ACB during fault.

3

Back - Next Page

TYPES OF CSR RELAYS : SPECIFICATION

SUITABLE FOR SYSTEM

PROTECTION O/L S/C E/F

REMARKS

TYPE CSR I

3 Phi - 3W

A

A

NA

CSR II

3 Phi- 4W

A

A

A

CSR III

3 Phi - 3W

A

A

A

-NCT & ICT supplied loose with the Breaker. ICT supplied loose with the Breaker.

TECHNICAL SPECIFICATIONS : Input Scaling (O/L Setting) In S/C pick up level setting S/C time delay IDMT characterists' selection Earth Fault ( E/F ) settings E/F time delay

0.5, 0.6, 0.7, 0.8, 0.9, & 1.0 times of rated currunt 2 In, 3 In, 4 In, 5 In, 6 In & 8 In Inst., 0.2, 0.4, 0.6, 0.8, & 1.0 Sec 4, 8, 12.5, 16, 21, & 25 seconds at 6 In. 0.2, 0.3, 0.4, 0.5, & 0.6 times In (max.) Inst. 0.2 , 0.4, 0.6, 0.8 & 1.0 Sec.

4

Back - Next Page

TECHNICAL DATA : REFERENCE IS : 13947 ( PART - 2 ) : 947 – 2 FRAME SPECIFICATION No of Poles Rated enclosed Thermal Current (A) (DEGREE CENTIGRADE) 40 45 50 55 60 65 70

Rated Insulation Voltage (V) Ui AC DC

800

800 800 800 790 780 770 760

1000 1250 3 or 4 1000 1000 1000 920 850 820 800

1250 1250 1250 1140 1050 970 900

1600

2000

2500

1600 1600 1600 1570 1440 1330 1200

3 or 4 2000 2000 2000 1850 1700 1550 1400

2500 2500 2500 2360 2200 2020 1800

3200

4000

3200 3200 3200 3000 2730 2480 2200

3 4000 4000 4000 3840 3600 3500 3400

3 or 4

1000 1200

1000 1200

1000 1200

1000 1200

50 kA 0.25 30 kA 25 kA

65 kA 0.20 38 kA 33 kA

80 kA 0.20 38 kA 33 kA

80 kA 0.20 38 kA 33 kA

105 kA

143 kA

176 kA

176 kA

Rated Short Time Withstand Current Icw 1 sec.

50 kA

60 kA

65 kA

65 kA

Total Making Time Total Breking Time Mechanical Life (No. of Ops.) Electrical Life (No. of Ops) MOTORISED MECHANISM ( AC / DC ) Operating Voltage Motor Power Current Total Charging Time SHUNT TRIP / CLOSING RELEASE AC Inrush DC Inrush Opening Time Delay (ms) UNDER VOLTAGE RELEASE AC - Inrush / ( Hold on ) DC - Inrush / ( Hold on ) Opening Time Delay (ms)

30 ms 38 ms 8000 3000

30 ms 38 ms 6000 3000

30 ms 40 ms 6000 1500

30 ms 40 ms 5000 1500

220 / 240 V 40 W 0.8 A 8 - 16 Sec.

220 /240 V 40 W 0.8 A 8 -16 Sec.

220 / 240 V 40 W 0.8 A 8 -16 Sec.

220 / 240 V 40 W 0.8 A 8 -16 Sec.

400 VA 250 W 15 - 20 ms

400 VA 250 W 15 - 20 ms

400 VA 250 W 15 - 20 ms

400 VA 250 W 15 - 20 ms

150/ ( 66 ) VA 185 / ( 5.5 ) W 20 - 30 ms

150/ ( 66 ) VA 185 / ( 5.5 ) W 20 - 30 ms

150/ ( 66 ) VA 185 / ( 5.5 ) W 20 - 30 ms

150/ ( 66 ) VA 185 / ( 5.5 ) W 20 - 30 ms

Rated S/C Breaking Capacities forAC Ics (Service) & icu (Ultimate) at 415V Power Factor Cos pie Rated S/C Breaking Capacities for DC * Ics (Service) & Icu (Ultimate) 220V At L/R = 15 ms 440V Rated Making Capacity (Peak) Icm AC 415V

* 3 POLES IN SERIES (ONLY WITH S/C PROTECTION UP TO 3200 A).

5

Back - Next Page

OVERLOAD / SHORT CIRCUIT SETTINGS : For ACB with Thermal Magnetic Protection

O / L Range (A)

Magnetic S / C Setting ( Standard ) ( kA )

Magnetic S/C ( Optional ) ( kA )

3-6-9

i) 1.2 - 2, 4 - 3.6 ii) 5 - 10 -15

Frame

CT Taps

LH 800

400 - 630 - 800/5

LH 1000

800 - 1000/5

400 - 800 500 - 1000

3-6-9

i) 1.2 - 2, 4 - 3.6 ii) 5 - 10 -15

LH 1250

800 - 1000 - 1250/5

400 - 800 500 - 1000 625 - 1250

3-6-9

i) 1.2 - 2, 4 - 3.6 ii) 5 - 10 -15

LH 1600

1250 - 1600/5

625 - 1250 800 - 1600

5 - 10 - 15

i) 3 - 6 - 9 ii) 15 - 20 - 25

LH 2000

1250 - 1600 2000/5

625 - 1250 800 - 1600 1000 - 2000

5 - 10 - 15

i) 3 - 6 - 9 ii) 15 - 20 - 25

LH 2500

2000 - 2500/5

5 - 10 - 15

i) 15 - 20 - 25

LH 3200

2000 - 2500 3000/5

5 - 10 -15

i) 15 - 20 - 25

LH 4000

3200 - 4000/5

5 times the C . T . Tap setting

----

200 - 400 315 - 630 400 - 800

1000 - 2000 1250 - 2500 1000 - 2000 1250 - 2500 1600 - 3200 1600 - 3200 2000 - 4000

6

Back - Next Page

Accessories SHUNT TRIP : Shunt trip is used for tripping the ACB , remotely or by external relays and in case of thermal overload relay operation. Normal operating voltage band is 70% tp 110% WIDE VOLTAGE BAND SHUNT TRIP ( 0 to 110% ) can also be provided as optional. Here shunt trip is fitted with RA unit. UNDER VOLTAGE TRIP (OPTIONAL) : Under Voltage trip is used for tripping the ACB during undervoltage, interlocking purposes and tripping the ACB remotely. Normal operating range is from 85% to 110% of rated voltage with a dropout voltage range of 35% to 70% TIME DELAYED UNDER VOLTAGE TRIP with a time delayed tripping upto 0.5 seconds can also be provided as an optional feature. Here UVT is fitted with RC unit. AUXILLIARY SWITCHES : ACBs are fitted with 4 N/O + 4 N/C auxiliary contacts as standard of which 3 N/O + 3 N/C potential free contacts are available to customer for external wiring. AUTOMATIC SAFETY SHUTTER (OPTIONAL) : When ACB is drawn out to maintenance positin, the shutter assembly automatically drops down and conceals the live main isolating contacts. DOOR INTERLOCK WITH DEFEAT FACILITY (OPTIONAL) : Door interlock can be provided to prevent opening of panel door woth ACB in SERVICE & TEST position for Drawout ACB. For Fixed type ACB, door interlock can be provided to prevent opening of panel door. When ACB is switched 'ON', it is possible to defeat the interlock, if necessary. SLIDING CONTACTS : In case of drawout ACBs , two sliding contacts for each auxiliary switch are necessary. A maximum of 30 ( single way ) sliding contacts can be provided per ACB. CASTEL LOCK ( OPTIONAL) : For interlocking two or more ACBs, Castel Lock can be fitted on the ACB on request.

7

Back - Next Page

LIST OF ACCESSORIES STANDARD

OPTIONAL

Shunt trip or U/V trip $

Shunt Trip U/V trip Closing release

Potential free3 NO + 3 NC Aux switcheswith sliding contact (for D/O ACB ) Closing release * Mech indication for ** Service/Test/Isolated Position

RC Unit for Time delayed U/V trip ( upto 0.50 sec. ) RS relay for time delay ( 40 ms fixed ) of S/C trip ## RS relay for time delay ( 40 - 460 ms ) of S/C trip ##

Gasket for moulded escutcheon

RA Unit for extending the voltage band ( 0% to 110% ) of shunt trip Shutter Assembly

* Only on Electrically operated ACB ** Only ib drawout ACB $$ Rating (A) at voltage

ACCESSORIES 240 V Auxiliary Switch Sliding Contact

Micro Switch for s/c trip indication for thermal - magnetic ACB #

15 A

415V AC 15A

10 A

6A

Micro Switch 10 A for S/C trip indication Micro Switch for AC UVT 10 A trip indication $$ For non inductive loads

Micro Switch for AC U/V trip indication Castel Lock Door Interlock Special sliding contacts for service/test position electrical indication

5A

EFR for 3ph - 3 wire system EFR for 3ph - 4 wire system

5A

30 way sliding contats including the one used for internal wireing of Shunt trip, closing release etc.

STANDARD RATING OF ACCESSORIES VOLTAGE Shunt Trip Wide Voltage Band Shunt Trip ( With RA Unit) Under Voltage Trip Time Delayed UVT (With RC Unit of 220 VAC ( o.5 Sec. Time Delay ) Time Delayed S/C Trip for Th. Mag. ACB (with RS Unit) * * * (40 - 460 ms) Motor Closing Release EFR for Th. Mag. ACB

24V DC

30V DC

48V DC

110V DC

A

A

A

A

220V 110V 240V 415V DC AC AC AC A

A

A

A

A A

A

A

A

A

A

A

A A

A

A

A

A

A

A A A

A A A

A A A

A A A A

A A A

A : Available * * * : Voltage rating of RS relay are available intwo versions. Time delay fixed at 40 ms. (with 240 V AC Input Supply ) & Time delay variable in steps fron 40 - 460 ms. # : Not available when fitted with RS relay. ## : Not applicable for ACBs with static release. $ : Applicable for Thermal - Magnetic ACB. If nothing is specified then 415 VAC Shunt Trip is provided as standard and if U/V is specified for ACB then shunt trip is optional.

8

Back - Next Page

TRIPPING CHARACTERISTICS Thermal Magnetic

IDMT Characteristics for static release curves I1, I3 & I5

IDMT Characteristics for static release curves I2, I4 & I6

9

Back - Top Page