Section Contents. 1. Introduction 2-5. Salient features, internal & general appearance of Drawout ACB

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3 Section Contents PAGES 1. Introduction 2-5 Salient features, internal & general appearance of Drawout ACB 2. Ratings & Specifications 6-9 Free air & enclosed thermal current ratings for AC & DC applications & selection of specifications 3. Multi-Function Protecion Devices Micro Processor Based over current trip device, Economical Thermal Magnetic & their accessories 4. Spring Charging Operations Manual & motor charging & accessories for closing operations 5. Electrical Tripping Shunt Trip, Capacitor Trip, UVT & Control Devices 6. Type of Mounting 20 Fixed, metal clad type, lifter, accessories for draw-out, safety shutter, position switch, S/C contacts, test jumper, mal-insertion/ prevention device 7. Other Accessories Aux. Switch, Key lock, Mechanical Interlock, Door Interlock, Lifter, carrying handle 8. Power Consumption 25 Internal resistance, reactance & special environmental specifications 9. Clearance 26 Clearance above Arc chute, maintenance space 10. Outline Dimensions Outline dimensions & Panel Mounting Details of D series ACBs of 630A to 4000A & C series ACBs of 5000 to 6300A 11. Electrical Connection Diagram Interconnections between electrical accessories & tripping devices 12. ACB Order Form 39 ACB Order Form

4 Introduction 1.0 Introduction C & S Air Circuit Breakers are available in the current range of 630A to 6300A with wide choice of options & Accessories! 2, 3 or 4 Pole version available in all current ratings, in fixed & drawout execution.! Motor charging or manual charging, facilitating local or remote control.! 5 types of protection & trip devices: a) Micro processor based RMS sensing overcurrent relay for industrial & generator protection.! Wide options of front panel fittings.! 8 type of Accessories for Drawout types, Safety Shutter, Position Switch, Test Jumper, Lifter, Mal Insertion Prevention Device, Door Interlock with defeat facility, Short Circuiting Contacts & Drawout position Padlock.! Vertical or horizontal bus bar connection arrangement. b) Electromagnetic instantaneous trip device with thermal O/L Relay for S/C & O/L protection for AC system & with Hall Sensor for DC system. c) Undervoltage trip with or without time delay for under voltage. d) Making current release for safeguarding against closing of Breaker on S/C faults.! 4 types of indication Switches, Auxiliary Switch, Trip Indication Switch, OCR Alarm Switch, Spring Charged Indication Switch. General Appearance of Air Circuit Breaker 4

5 Introduction 1.1 Salient Features! Lightest and most compact for a given capacity.! Most simple to operate & maintain. Only a screw driver a spanner required for replacing the arcing contacts.! Only 4 frame sizes for entire range (630A to 6300A), resulting in maximum interchangeability, commonality of parts and minimum inventory of spares.! High breaking capacity, 50KA to 120KA and making capacity from 105KA to 264KA with line or load connected to upper or lower terminals.! High speed operating Mechanism ensures a total opening time of 30ms (including arcing time of less than 10ms) and a total closing time of 40m sec.! Neutral pole of 4 pole ACB is of same current rating as of 3 pole.! Due to use of tungsten-silver sintered metal contacts, high speed opening mechanism & electromagnetic instantaneous trip device, most suitable for capacitor switching & DC application.! High dielectric strength even in hot and humid conditions due to use of class B and F insulating materials.! Comply with utilisation category B & pollution degree 3 Group I of IEC 947-Part I.! Can withstand impulse voltage of 8KV (peak), 1.2/50 micro sec. wave as per case A in homogeneous field condition of IEC 947-Part-I.! D-series Breaker fitted in Panel with door cut out meets IP42 protection.! Designed to provide continuous duty even in adverse environmental conditions.! Highest degree of system protection & coordination due to use of microprocessor based protection release. Internal Structure Model: AH-6D, Draw-out, Motor Charging Type Stored energy type 1. Overcurrent trip device (Microprocessor based) 2. Arc chutes 3. Isolating contacts of control circuits 4. Main circuit Terminals 5. Draw out moulded base 6. Main circuit terminals 7. Isolating contacts of main circuits 8. Fixed arcing contacts 9. Moving arcing contacts 10. Fixed main contacts 11. Moving main contacts 12. Closing mechanism 13. Trip bar 14. Inst. trip devices 15. CT (for overcurrent trip device) 16. Charging motor 17. Closing latch release 18. Closing spring 19. Charging handle 20. Quick close Slow close selector lever 21. Auxiliary switches 5

6 Introduction 1.2 Front Panel designed for the new Millennium Three Front Panel Cut-outs for entire range (630A to 6300A), help standardise your design " & ( ) * # $ % 12 ' " Rating Name Plate. # Charging Handle. $ Close Open Cycle Counter (Optional). % D/O Position Indicator. & ' Spring Charge Indicator. Close Open Indicator. ( Open Position Padlock (Optional). ) Push to Close Button. * Push to Open Button. + Close Position Padlock (Optional). 11 Draw-out insertion Hole. 12 Draw-out Position Padlock (Optional). 13 Key Lock. 14 Castle Lock. 15 D/O Operation Instruction nameplate. 16 Panel Gasket. The front panel indicator provides Breaker position indication: "CONNECTED", "TEST" or "ISOLATED" The shutter prevents erroneous insertion of the handle. This can be opened by lowering the position stop release lever only when the Breaker is open. When the Breaker is closed, the release lever can not be lowered. Thus, the shutter can not be opened. The Panel Cutout Rubber Gasket provides complete dust-proof protection. 6

7 Introduction 1.3 High Breaking capacity and large short time current capacity! By fully utilising electromagnetic repulsive force, a large short time current and high breaking capacity is achieved in our light and compact design.! Light contact springs used to provide adequate contact pressure to keep the contact temperature well within limits and also to avoid contact bouncing.! A large short circuit current causes an electromagnetic repulsive force between the contact lead halves.! This repulsive force works in a direction to turn the moving contact clockwise about the contact shaft, giving it more contact pressure proportional to the short circuit current.! When interrupting a large current, the electromagnetic repulsive force works in a direction to separate the moving contact from the stationary contact.! This electromagnetic repulsive force adds to the separating force of trip spring, resulting in a high speed interruption Complete Isolation of Poles All the poles are completely isolated from each other as well as from operating mechanism by high grade insulating materials. A robust design of Arc Chute in a temperature resistant moulded body and fitted with scientifically shaped Deion-Grids, totally encompasses the poles. The high short circuit arc gases thus escape through arc chute only which clears and cools the highest short circuit arc energy in less than 10ms. This isolation thus helps in providing highest insulation properties as well as breaking capacity High AC dielectric withstand voltage Due to the use of non-hygroscopic, glass fibre based insulating materials and corrugated shape employed for better creepage distance, the AH series can withstand a dielectric voltage of 3.5KV for a minute Space saving & standardisation of Switchboard design The light and compact ACBs in 4 frame sizes not only help in standardising the Switchboard design but also reduce the size of load centre. Four Breakers upto 1600A frame and 3 Breakers above 1600A upto 4000A frame can be arranged vertically in standard height of 2300mm. T T T T T T T T T T T T T T T T T T T T T T Highly Resistant to Vibration Smallness of each component due to rational design ensures a low response factor to vibration and high natural frequency. The design is also highly resistant to vibrations as required in ships. upto 1600AF 2000AF 3200AF Compact Breaker leads to space saving in Switchboards 7

8 Ratings & Specifications 2.0 Ratings & Specifications TYPE AH-6B/D AH-8B/D AH-10B/D AMPERES FRAME IEC,BS,VDE,AS, IS I th + (A) JIS " JEC NEMA, ANSI Marine number of poles 2, 3, 4 2, 3, 4 2, 3, 4 RATED CURRENT OF OVERCURRENT TRIP DEVICE I n (A) for general industrial plant application for generator protection (I n is generator rated current) RATED INSULATION VOLTAGE (U i ) AC 690/ / /1000 RATED ULTIMATE BREAKING/MAKING CAPACITY (Icu/Icm) ' at Ue(AC) 415V 50/105 50/105 55/121 RATED SERVICE BREAKING/MAKING CAPACITY (PEAK)(Ics/Icm)# at Ue(AC) 415V 45/ / /105 IEC with INST AC 690 V 600 V 30 / / / / / / 84 IS 500 V 380 V 40 / / / / / / 126 BS without INST AC 240, 220 V 690 V 50 / / / / / / 84 VDE with MCR and STD 600 V 35 / / / 84 AS upto 500 V 40 / / / 94.5 without INST AC 690 V 30 / / / 63 upto 600 V 30 / / / 63 NEMA with INST AC 690 V 35 / / / 84 ANSI 480 V 40 / / / V 50 / / / 143 without INST AC 690V 35 / / / 84 with MCR and STD upto 480 V 40 / / / 94.5 without INST upto AC 600 V 30 / / / 63 JIS with INST AC 550 V 35 / / / 94.5 JEC 460 V 40 / / / V 50 / / / 143 without INST AC 550 V 35 / / / 84 with MCR and STD upto 460 V 40 / / / 94.5 without INST upto 550 V 30 / / / 63 with INST DC 250 V $ 40 / / / 40 OTHER RATINGS short time current RMS (ka) 1 sec [3 sec.] Icw 45 / [25] 45 / [25] 50 / [25] total breaking time % RATED CLOSED TIME stored energy spring charging time (sec.) max close time (m sec.) max " Rated thermal current in open Air. # Higher breaking capacity ACBs available on request. $ DC rating is of special application. 250 < I n < I n < I n < I n < I n

9 Ratings & Specifications AH-12B/D AH-16B/D AH-20C/D AH-25C/D AH-30C/D AH-40C/D AH-50C AH-60C , 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, I n I n < I n I n <I n 2000 I n / / / / / / / / /121 55/121 60/132 65/143 75/ / / /264 50/105 50/105 50/105 50/105 65/143 85/187 85/ / / / / / / / / / / / 94.5& 45 / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / [25] 50 [45] 50 [50] 50 [50] 65 [65] 85 [70] 85 [70] 100 [70] < I n 3200 I n 4000 I n 5000 I n 6300 % Values when fitted with magnetic type instantaneous trip seconds for solid state instantaneous trip. & AH-16C suitable for 50 KA breaking capacity at 600V AC also available on request. ' Rated service breaking capacity & rated ultimate breaking capacity are same at all other voltages except at 415V. 9

10 Ratings & Specifications 2.1 Conventional free air and enclosed current ratings The thermal current ratings I th of Circuit Breakers shown in ratings & specifications table on page No. 8 are free air ratings i.e. in open execution at 40 o C ambient. The thermal ratings of the Circuit Breaker when mounted inside an enclosure depend upon: a) The dimensions of the cubical in which the Breaker is mounted. b) Ventilation area provided by way of louvers in the Breaker cubicle. c) Cross sectional area of the bus bars connected to the Breaker terminals. d) Ambient temperature other than 40 o C For ease of selection of our Breaker, keeping above factors into consideration, the thermal current ratings (I th ) in an enclosure having ventilation & recommended ambient temperature are shown in the table below: S. Open Air With no Ventilation With Ventilation Ventilation Min. enclosure dimensions (mm) No. Rating At 40 At 50 area cm sq. o C At 50 o C At 40 o C o C Width Height Depth Note 1. The above enclosed thermal current ratings (I th ) have been based when the Breaker Terminals are connected with copper or aluminium bus bars of cross sectional area as indicated in Table XI of IEC & IS C & S may be consulted, for thermal current ratings in Enclosure with less ventilation area other than shown in the above Table or at different ambient temperatures. 2.2 Application AC System! 3 pole ACB for Industrial & Generator application.! 4 Pole ACB for complete safety in 3 phase 4 wire distribution system as the neutral pole of 4 pole ACB closes earlier & opens later than other phase poles, thus effectively preventing transient overvoltages on loads connected between live & neutral lines DC System! 2 pole ACB can be used on DC system where the short circuit breaking capacity requirement is not very high.! 3 pole ACB with 2 poles connected in series can be used in DC system where the short circuit breaking capacity requirement is comparatively high.! A 4 pole ACB with 2 poles connected in parallel can be used where the short circuit breaking capacity requirement is low but the thermal current rating is high. (For this application, the neutral pole closes alongwith the phase poles). Please clearly specify 4 pole ACB for DC application. 10

11 Ratings & Specifications 2.3 A Wide Selection of Specifications Various specification are available for wide selection to suit any particular application as well as local regulations and requirements. ITEM SELECTION AT T YOUR OPTION 1 Breaker Rating 630 A 800 A 1000 A 1250 A 1600 A 2000 A 2500 A 3200 A 4000 A 5000 A 6300 A 2 3 Types of Mounting Accessories for draw-out type Fixed type Draw-out type (standard) Metalclad construction, Safety shutter, Position switch, Short-circuiting contact, Mal-insertion prevention device, Lifter, Test jumper 4 Types of closing operation Manual charging type Motor charging type 5 6 Accessories for closing operation Overcurrent trip Devices * L.T.D. means Long Time Delay * S.T.D. means Short Time Delay for General Industrial Plant Adjustable L.T.D. Adjustable S.T.D. Adjustable INST. Adjustable Ground-fault Non adjustable INST. or Making current release Micro processor based for generator Protection Adjustable L.T.D. Adjustable S.T.D. Non adjustable INST. or Making current release Power transformer Spring charged switch Thermal Magnetic type for General Industrial Plant Adjustable L.T.D. Non adjustable INST. or Making current release 7 Accessories for overcurrent trip device OCR Alarm switch DC24V power supply OCR checker CT for Neutral line OCR Alarm switch 8 9 Other trips Other accessories Shunt trip Capacitor trip Undervoltage trip With or without T.D. Trip indication switch Close-open cycle counter Key lock / Castle lock Key interlock system 10 Types & series of Breaker C - Series D - Series Air Circuit Breaker is assembled to comply with your specifications Note : Tropicalisation, cold climate treatment available on request at extra cost. 11

12 3.0 Multi Function Protection Devices Multi-Function Protection Devices 3.1 Microprocessor Based Overcurrent Trip Device: Type µit µit is a true RMS sensing overcurrent trip device, requiring no external supply for its basic function. It is available in two types, i.e., µit 100 for industrial application and µit G for generator protection. Salient Features 11 + ' ( ) * µit " Overload (L.T.D.) current setting DIP switch. # Overload (L.T.D.) tripping time setting DIP switch. $ Short circuit (S.T.D.) current setting DIP switch. % Short circuit (S.T.D.) tripping time setting DIP switch. & ' Instantaneous short-circuit current setting DIP switch. Earth fault tripping current setting DIP switch. ( Earth fault tripping time setting DIP switch. ) Built-in operation checking DIP switch. * Function blocking DIP switch. + Reset switch. 11 LED Indicators. " # $ % &! Error free and user friendly setting of current and time delay.! Provides highest degree of system protection coordination.! Self powered by the built in current transformer.! No mal-operation due to external disturbances.! Built in operation check function.! Visual fault discrimination by LEDs.! Three phase and earth fault in one single compact unit.! Self monitoring of trip unit with blinking indication.! Function Blocking facility provided.! Certified by ERTL for Damp Heat Test IS 9000-PG4 Dry Heat Test IS 9000-PG3 Vibration Test IEC255-4 Radio Frequency Interference (RFI) IEC801-3 Electrostatic Discharge (ESD) IEC Electrical Fast Transient (EFT) IEC Surge IEC Impulse IEC Note : µit-g is similar to µit-100 in construction and function but differs in current and time settings of LTD & STD. 12

13 Characteristic Curves µit-100 (For Industrial Applications) Multi-Function Protection Devices Setting of Over Load Current (LTD) LTD TD Current:Minimum setting is 0.5 times I n Setting range: 0.5, (in steps of 0.05) LTD T ime: Delay Setting of Short Circuit Current (STD) STD Current: Minimum setting 4 x I n Setting range 4, (in steps of 1) STD Time: Minimum Setting 50 ms Delay Minimum Setting sec. Setting range: 2.5, 5... to 35 sec. (in steps of 2.5 sec.) Setting Range 50, 100, ms. (in steps of 50 ms) Setting of Instantaneous Current Current (INS): Minimum setting 4xI n Setting Ranges: 4, 5, (in steps of 1) Function Blocking In normal running operation of unit or in test mode any of the four function can be blocked by turning the DIP switches to ON position Ground Fault Setting (GFT) GFT Current: Minimum Setting 15% of I n Setting Range 15, 20, % (in steps of 5%) GFT Time: Minimum Setting 50 ms Delay Setting Range 50, 100, ms (in steps of 50ms) 13

14 Multi-Function Protection Devices Characteristic Curves µit-g (For Generator Applications) Setting of Over Load Current (LTD) L TD Settings: a)minimum setting is 1 times I n Setting Range: 1 to 1.3 I n (in steps of 0.05) b) Time = 15 to 65 sec at 120% I n min. settings 15 sec (in steps of 5 sec.) STD Settings: a ) Current = 2 to 5.75I n (in steps of 0.25) b) Time = 50msec. to 420msec. (in steps of 50 msec.) Test Mode by 24V DC for testing the trip unit without injecting current Step 1: Put the DIP switch to TEST POSITION Step 2: Put the LONG or SHORT switch to ON position. µit will give trip command depending upon the time set on respective LTD or STD time delay DIP switches. CAUTION : In normal running condition all the Test Mode DIP switches should be in OFF position (Normal position) LED Indication ON - LED : This will indicate normal operation of unit. - All the other three LEDs will glow on their respective faults. - Reset switch is given to reset the LEDs. Setting Example DIP Switch Position OFF ON LTD Current I O =1.25*I n X = 1.0 a = 0.05 b = 0.05 c = 0.10 d = 0.10 LTD Time = 25 Sec. X = 2.5 a = 2.5 b = 5 c = 10 d = 15 t = X+(a+b+d) 25 Sec = 2.5+( ) I O = X+(a+c+d) 1.25 = 1.0+( ) When X - min. value abcd - settings 14

15 Multi-Function Protection Device 3.2 Economical Thermal Magnetic type! A direct acting electromagnetic instantaneous trip device with fixed current setting for short circuit protection.! CT actuated thermal O/L Relay used along with Shunt Trip or Undervoltage Trip Device for O/L protection! Hall sensor actuated over load protection for DC application can also be provided Base Current (I n ) (for Microprocessor & Thermal Magnetic Types)! Microprocessor Type and T hermal Magnetic Type both have a single base current that corresponds to one of the rated currents available. When ordering, specify the base current (I n ) that is higher than and closest to the rated load current passing through the Air Circuit Breaker.! Trip testing at CT secondary current levels. Type Base Current (I ) [A] n Type Base Current (I ) [A] n of ACB Microprocessor Type Thermal Magnetic Type of ACB Microprocessor Type Thermal Magnetic Type AH-6D AH-8D AH-10D AH-12D AH-16D AH-20D AH-25D AH-30D AH-40D AH-50C AH-60C

16 Multi-Function Protection Devices Current Setting of the nonadjustable magnetic instantaneous trip and MCR Applicable Breaker AH-6D AH-10D AH-20D AH25D AH-30D AH-40D AH-60C AH-12D AH-50C AH-16D ELECTROMAGNETIC NI Instantaneous Trip Device 3 5 # " " " * Select and specify one of the 15 " pick-up currents from the 20 " table * Tolerance is + 20% 60 MCR Making Current Release 3 5 # " " * Select and specify one of the 10 " pick-up currents from the 15 " table 20 " * Tolerance is + 20% Note : " : Applicable where the rated current of overcurrent trip devices is not less than 250A. # : Applicable to AH-10D and AH-12D Making Current Release (MCR) MCR instantaneously trips the Breaker without any intentional time delay during closing operation, if the making current exceeds a predetermined value and which is rendered inoperative when the Circuit Breaker is in closed condition. When the Breaker is closed on to a normal circuit condition, MCR becomes inoperative affecting normal coordinated system protection, thus most suitable for incomer Breaker. A short time delay tripping ACB fitted with MCR can thus utilise its full particular time capacity by forming a selective tripping system with the other Breaker and can rapidly clear the faulty circuit without any time delay when the Operator attempts to close it. How MCR Operates MCR Inoperative MCR Operative MCR Inoperative Short-circuit current may flow Closing Process Closed Condition Contacts Start to move Arcing Contacts Close Main Contacts Close Latched in Closing Stroke 16

17 3.3 Accessories for Overcurrent Trip Devices OCR Alarm Switch Multi-Function Protection Devices This switch operates when the Air Circuit Breaker is tripped by the overcurrent device. Any of LTD, STD, INST or earth-fault trip causes operation of this OCR alarm switch. Its operation is as follows : normally OFF, ON for about 30 ms during ACB contact separation, then OFF again. Use a suitable self-hold circuit for continuous OCR trip alarm indication V DC Power Supply (To be fitted in the Panel), Ratings Number of contacts 1a Circuitry Resistive Lamp Inductive Motor Rated 480V current (A) AC 250V V V DC 125V V , Lamp is a resistive load of positive temperature coefficient with inrush in excess of 10 times the normal current., Inductive is a load whose power factor is 0.4 or more (AC) or time constant is 7 ms or less (DC), Motor assumes starting current of 6 times the specified value.! Supplies 24V DC power to the microprocessor over-current trip device for : - device function check purposes and - for lighting the OCR trip indicators (LEDs) OCR checker (outside) Type : RCU - 2 Power : 500VA, 50/60Hz 240V Consumption Test: i) Calibration of current Functions & time settings of LTD, STD, Instantenous & Ground Fault ii) Function Check by 24V DC. iii)closing Opening time of ACB Dimensions : 545W x 420D x 345H Weight : 28 kg Dimension Drawing of 24V DC Power Supply Unit Phase & Neutral CTs OCR Checker Polyester resin cast 5A secondary, 5VA, class 5P10 precision CTs are rigidly mounted on the lower terminals of the Breaker. The CTs thus provide most reliable and accurate current signals to the protection devices even in adverse environmental conditions. The CT used for detecting a neutral line current in a 3 pole Breaker of a 3 phase four wire system, is mounted outside on the neutral bus bar. This CT is necessary when over current trip device is having a ground fault protection element. However, in a 4 pole Breaker, the neutral CT is rigidly mounted on the neutral terminal of the Breaker. 17

18 4.0 Spring Charging Operations Spring Charging Operations 4.1 Charging of Springs Manually The closing springs are manually charged by pumping the charging handle. When PUSH TO CLOSE button is pressed, the charge of the closing springs is released, quickly closing the Breaker. A closing coil (Latch Release Coil-LRC) can be provided for remote closing operations, however, the closing springs would have to be charged manually before doing a remote close operation. With the Breaker closed, the Motor automatically starts to charge the spring again for the next closing operation. Manual charging is also possible in Motor charging type. 4.2 Charging of Springs by Motor The closing Springs are charged by an Electric Motor. A closing command from an external Push Button energises the LRC (Latch Release Coil) which releases the charge of the closing spring to quickly close the Breaker. Motor Charging type 4.3 Rating of Motor charging -Spring release type Rated voltage (V) Min. And Max. Inrush current (A) Steady-state current Charging Closing Command 50/60 Hz Operating Voltage (peak value) (AC:RMS value) time (S) current (A) Max. - Applicable Breakers : AH-6D, AH-10D, AH-12D, AH-16D AC 200~ ~ (220V) 1.0(220V) 4.0(220V) 2.7(220V) 100~115 85~ (110V) 0.8(110V) 6.0(110V) 4.0(110V) DC 200~ ~ (200V) 0.7(200V) 4.0(200V) 1.7(200V) 100~110 75~ (100V) 0.8(100V) 6.0(100V) 2.7(100V) - Applicable Breakers : AH-20D, AH25D, AH-30D, AH-40D, AH-50C, AH-60C AC 200~ ~255 21(220V) 1.0(220V) 3.5(220V) 2.7(220V) 100~115 85~ (110V) 0.8(110V) 5.0(220V) 4.0(110V) DC 200~ ~ (200V) 0.6(200V) 4.0(200V) 2.7(200V) Note : 100~110 75~ (100V) 0.5(100V) 6.0(100V) 2.7(100V). The charging motor is of short-time rating and the number of repeated open close cycles must be limited to 15 cycles followed by a cooling period of at least 20 minutes for further operations. 18

19 4.4 Motor Charging And Closing Operation Circuit Charging of Closing Springs Spring Charging Operations! When the closing springs are "DISCHARGED", the spring charged OFF switch in series with the motor, is closed.! Control voltage is applied to terminals 1 and 2 and the motor starts to charge the springs.! When the closing springs are fully charged, the spring charged OFF switch in series with the motor opens and cuts the supply to the motor Closing the ACB! When the springs are charged, the "spring charged ON switch" in series with the LRC is closed.! Apply voltages across terminals 3 and 4 through PB (close). The latch release coil (LRC) is energised and the closing springs are released to close the ACB.! With the release of Closing Spring charge, the Spring Charged On Sw opens and the supply to the LRC is cut OFF through the Aux.Sw.B1 Contact which opens when the ACB gets closed Anti-Pumping Function! Once the closing spring have been released the ACB Reset OFF switch is closed. If a closed signal is continuously applied across the terminals 2 and 3, the holding relay (HC) is energised and self holds when the HC/1 contact closes.! The HC/2 contact opens, cutting the supply to the LRC, ACB can not reclose without opening the PB (Close). Closing Operation Circuit M LRC HC B1 PB Charging motor Closing Latch Release Anti Pump Relay of ACB Aux. Switch of ACB Control Switch Isolation Contact Circuit Diagram:- Closing Circuit! The circuit may be separated into a closing control and a motor circuit on request, so that they can be individually energised.! When ACB is fitted with under voltage trip UVT and tripped by it (voltage below opening value). ACB will not reset until voltage above resettable value is supplied to UVT.! The diagram shows the condition when closing springs are uncharged and ACB is tripped (not reset yet). 19

20 Electrical Tripping 4.5 Accessories For Closing Operation Power Transformer Outside When the control supply voltage is higher than 230V AC, our special Step Down Transformer or a 350VA Transformer with 220V secondary should be used for electrical charging operation Spring Charged Switch Provides a NO (1a) contact signal, which is closed when the closing springs are fully charged. Used for indication at a remote place, from where closing is made. 5.3 Undervoltage Trip The undervoltage trip automatically opens the Air Circuit Breaker when the voltage supplied to it drops below the opening voltage. It resets automatically on recovery of the supply voltage above the resettable value, and allows for closing of the Air Circuit Breaker. The undervoltage trip consists of an undervoltage trip device built-in the ACB and UVT Control Device installed external to the ACB. Ratings 250V AC - 15A, 250V DC A 480V AC - 5A, 125V DC - 0.5A 5.0 Electrical Tripping 5.1 Shunt Trip The shunt trip device is used to electrically open or trip the Air Circuit Breaker from a remote place. The tripping commands to the shunt trip include those from an overcurrent relay, reverse power relay, and similar protective relays. Note that the shunt trip uses one a -contact of the auxiliary switch. Undervoltage Trip Shunt Trip Rated Voltage (V) Min & Max. Excitation Type 50/60 (Hz) Operating Voltages (V) Current Peak AC (415V) (380V) AVH-S (220V) (110V) DC (220V) (110V) (24V) (48V) 5.2 Capacitor Trip The shunt trip device will not work when power supply (AC) of the trip equipment is disconnected or when the voltage drops due to some kind of short circuit accident. In such a case the capacitor trip operates to trip the Air Circuit Breaker. For capacitor tripping, the shunt trip device is necessary.,rating : Capacitor Trip Type Rated voltage (V) AC 110V/220V Rated frequency (Hz) 50/60 Using type AVH-1 Even in case when capacitor tripping is used it is possible to open the Air Circuit Breaker when the overcurrent relay or low voltage relay operates. Capacitor trip is installed external to the Air Circuit Breaker but can be fitted inside the switchboard. Capacitor Trip 20

21 Electrical Tripping 5.5 UVT Control Devices Three Types of Control Devices are available! Type AUH-V is without time-delay, and is used for AC supply. It trips the ACB immediately on dropping of the supply voltage below the opening value.! AUH-V-T is also for AC supply but with a timedelay of 500 ms. It effectively prevents the overiding of the short time delay over current trip function caused by short circuit fault & simultaneous voltage drop.! Type AUH-1SC is without time delay and is suitable for DC supply only.! The undervoltage trip, when in operation with supply voltage below resettable value, keeps the closing control circuit open and locks out the PUSH TO TRIP button. AC - rated Undervoltage Trip Control Circuit DC - rated Undervoltage Trip Control Circuit Under Rated Voltage (V) Opening [resettable] Excitation Voltage Type 50/60 (Hz) Voltages (V) Current Peak AC (330) 0.1 (415V) (170) 0.1 (220V) AUH (170) 0.1 (110V) DC (170) 0.1 (200V) (85) 0.1 (100V) 21

22 Type of Mounting 6.0 Types Of Mounting 6.1 Fixed Type This consists only of the Circuit Breaker fitted with brackets to enable it to be permanently mounted inside the Panel and the bus bars are directly connected to its terminals. 6.2 Metal Clad Type The metal clad type consists of a fixed or draw out Circuit Breaker housed in a steel enclosure. This can be used as a single pole mounted ACB or can be readily constructed in a load centre by simply placing them one upon another in a tier arrangement. 6.4 Draw out type This consists of a Circuit Breaker and a draw-out cradle. The Circuit Breaker can be withdrawn to any of the four draw out positions i.e. "CONNECTED", "TEST", "DISCONNECTED" & "REMOVED". The Circuit Breaker body is kept connected to earth through earthing shoes to the draw out frame in "CONNECT", "TEST" or in between to provide total safety to the Operator. The Panel door can be kept closed in "CONNECTED", "TEST" & "DISCONNECTED" position. 6.3 Lifter A Sleek Lifter with variable size loader to suite all sizes of ACB or with a platform for safely handling the Breaker in plant or for mounting or removing them from the panel are available Lifter 22

23 6.5 Accessories (Optional) for Draw-out Breaker Type of Mounting The following types of accessories are available for draw-out type Air Circuit Breaker Safety Shutter! When the Breaker is drawn out, it protects the operator from accidental contact with the live parts by automatically concealing the main circuit on the draw-out frame side with insulating barrier.! The shutter has a tamper proof lock mechanism. As the Breaker is inserted into the draw-out frame, it unlocks automatically to free the shutter and the shutter opens.! The shutter can be padlocked in the shut position.! Labels, "BUSBAR" and "CIRCUIT", are supplied to indicate the line-side and load-side main circuit terminals, respectively, and they are to be affixed by the user Position Switch There is 1NO contact to indicate the "TEST" position and 1NC contact to indicate the "CONNECTED" position. Ratings 250V AC - 15A, 250V DC A 480V AC - 5A, 125V DC - 0.5A Short-Circuiting Contacts Test Jumper Safety Shuter The test jumper allows checking of all functions on the removed Breaker on a Test Bench and can be supplied on request Mal-Insertion Prevention Device A good interchangeability exists in the C&S -Air Circuit Breakers and because of this feature, there is a possibility for a Breaker of a different rating being placed into the cradle of other rating. This is effectively prevented by the use of the Malinsertion Prevention Device. The short-circuiting contact shorts out the associated auxiliary switch b-contact when the Breaker is in the test position or further out position. Therefore, the b-contact circuit with this short-circuiting contact remains closed even when the Breaker is closed at the test position. This contact is useful when forming an interlock circuit with another Breaker or Breakers or when preventing the test operation at the test position from causing any unwanted operation in the associated circuit. The short-circuiting contact is open when the Breaker is in the connected position, and it can be fitted in parallel with any of the auxiliary switch circuits, B2, B3, B4 and B5. 23

24 Other Accessories 7.0 Other Accessories 7.1 Auxiliary Switch The auxiliary switch is an assembly of auxiliary contacts mechanically operated by the Air Circuit Breaker to electrically indicate whether the Breaker is closed or open. Every Air Circuit Breaker is fitted with an auxiliary switch. The Aux. Sw Contacts can be provided in following combinations and out of which some contacts are utilised for various accessories fitted in Breaker as shown in the table. 7.2 Combination of Aux. SW Contacts Aux Sw 14 way 7-a-contact and 7-b-contacts (7a, 7b) 10 way 5-a-contact and 5-b-contact (5a, 5b) 5 way 3-a-contacts and 2-b-contacts (3a, 2b) or 2-a-contacts and 3-b-contact (2a, 3b) 7.3 Trip Indication Switch This switch closes (ON) when the Air Circuit Breaker is tripped by overcurrent trip, shunt trip, undervoltage trip or manual operation of PUSH TO TRIP buttons. The table shown summarizes when the trip indication switch operates (ON) and when it is reset (OFF). Use a suitable self hold circuit as necessary for continuous trip alarm indication. 7.4 Key Lock & Castle Lock, Ratings : Aux. Switch Contacts Type AXH-1 Numbers of contacts 5a 5b Rated current (A) AC 450V 7 AC 220V 7 AC 110V 7 DC 250V 2.5 DC 125V 4 Auxiliary Contacts Used Accessory Fixed Draw-out Charging Motor 1b 1b Shunt Trip / UVT 1a 1a Over Current Trip Device 1a 1a Metal Clad - 1a, 1b Cause of Operation Overcurrent trip-shunt trip Undervoltage trip Remote opening Undervoltage below opening value PUSH TO TRIP button pressed Resetting Condition Turn OFF on completion of spring charging Turn OFF on recovery of voltage above resettable value and on completion of spring charging Turn OFF on completion of spring charging after release of button *Rating of TIS are same as of OCR Alarm SW It locks the Breaker in CLOSED or OPEN position, and a key is necessary to unlock so that only the authorised operator can operate the Breaker and prevent it from being operated by unauthorised persons. Key Lock! LOCK-IN-OPEN TYPE Locks the Breaker in open position.! LOCK-IN-CLOSED TYPE Locks the Breaker in CLOSED position. (Specify either type when ordering). Castle Lock! A device that is ready for use, when a Castle key lock is fitted is also available (specify type of Castle lock when ordering). 24 Key Lock Castle Lock

25 Other Accessories 7.5 Key Interlock System A system of key locks used to interlock a number of Breakers. The key is removable only when the Circuit Breaker is locked open.! Application Example Incoming power Breakers 1 and 2 feed two bus sections, which are connected by a bus-tie-breaker-3. Breaker 3 cannot be closed When the bus-tie Breaker is closed, parallel feeding with both Breaker 1 and 2 closed should not be possible. In this case, the same-numbered locks are fitted in all the 3 Circuit Breakers and only two keys are used, so that the bus-tie Breaker can be closed only when either the Breaker 1 or 2 is locked in the open position and that the Breakers 1 and 2 can be closed only when the bus-tie Breaker is locked open. Breaker 2 cannot be closed A key lock device that is ready for use when a Castle key lock (to be provided by the user) is fitted, is also available. 7.6 Padlocking for user safety Circuit Breakers are provided with Padlocking facility on push to Trip & Push to Close button to avoid accidental operation of breaking by unauthorised persons. Breaker 1 cannot be closed The padlocking arrangement has also been provided in drawout Breakers in all the 3 positions i.e. "CONNECT", "TEST" & "DISCONNECT" positions. This not only provides additional safety to the Operator but also prevents the Breaker dislocation due to vibration and shocks. 7.7 Operation Counter A four digit mechanical counter can be fitted with display window on the front panel to show the number of operations and to facilitate routine maintenance after specified number of operations. Padlock Facility 25

26 Other Accessories 7.8 Mechanical Interlock Two Breakers can be mechanically interlocked. The Mechanical Interlock is available to any combination i.e. in a vertical or horizontal arrangement between any frame size in fixed or drawout version. Horizontal Type Vertical Type 7.9 Door Interlock The door interlock prevents the switchboard door from being opened when the Breaker is CLOSED. The door is operational only when the Breaker is OPEN. It is also fitted with a lock release. Installation of the door interlock requires a simple drilling of the Switchboard Panel door Lifting Plate For use with hooks, ropes etc. when lifting the Breaker Carrying Handle Carrying Handle For the purpose of lifting by hand Door Flange Provided with D-Series ACB s to cover the panel cutout of the board IP Cover Mounted on the Switchboard Panel door to provide IP55 degree of protection as defined in IEC529. IP Cover 26

27 Power Consumption 8.0 Multivolt drop, power consumption, (per pole) Multivolt frop Power consumption Model No. & Type per phase (W) (Max) (mv) (Max) } } AH-6D fixed type AH-8D draw-out type AH-10D fixed type AH-12D draw-out type AH-16D fixed type draw-out type AH-20D fixed type draw-out type AH-25D fixed type draw-out type AH-30D fixed type draw-out type AH-40D fixed type draw-out type AH-50C draw-out type AH-60C draw-out type Special Environment Specs. If the Breakers are to be used under abnormal environmental conditions, specify the applicable treatment given below : Moisture Treatment This treatment is recommended for Breakers which are to be used in areas where both temperature & humidity are higher i.e. Ambient temperature 60 o C or less & relative humidity 95% or less provided no condensation Anti-Corrosion Treatment This treatment is recommended when Breakers are to be used in highly saline atmosphere or in chemical plants Cold Climate Treatment This treatment is provided when the Breaker is to be used in very cold areas i.e. Storage - 40 o C, Use -25 o C Provided no condensation or freezing. 27

28 9.0 Clearance Above Arc Chute, Maintenance Space Clearance above Arc chute, maintenance space Clearance Arc gases expel out from the arc chutes when the Breaker interrupt a short circuit fault current. It is therefore necessary to keep the area above these arc chutes clear of any metallic objects, including electric devices and earthed structures, at least by the distance shown below in reference to the Breaker bottom level. If the provision of such distance is impracticable, then provide a barrier of heat and flame resistant insulating material and of sufficient size to cover all arc chutes at the position indicated also as minimum from the Breaker bottom level. For fixed type air circuit Breakers, also, provide a sufficient maintenance space around the beaker. If an arc barrier is provided within the recommended maintenance space, make the Breaker removable Metallic Structure / Electric Devices Heat/Flame Resistant Insulating Plate 28

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30 Outline Dimensions 10.0 Outline Dimensions and Panel Mounting Details (in mm) For AH-6D to AH-16D DRAW-OUT TYPE Note: N is neutral pole of 4-pole breaker. PANEL CUTOUT LH CL (3P) (4P) N (3P) (4P) 215(3P) (4P) (max.) (max.) Mounting holes 4-ø10 Projection of the mounting bolt into the draw-out cradle should be 13mm max. FIXED TYPE Note: N is neutral pole of 4-pole breaker. PANEL CUTOUT HL LH (3P) (4P) N Terminal blocks for control circuits (Left,Right) Screw M (3P) 284(4P) 199(3P) 299(4P) 12 Mounting holes 2-ø10 30

31 Outline Dimensions Dimensions of Metalclad Construction (3P) WEIGHT (kg) TYPE AH-6D/8D AH-10D No.OF POLES MOTOR CHARGING DRAW-OUT TYPE TYPE FIXED TYPE MANUAL CHARGING DRAW-OUT TYPE TYPE FIXED TYPE AH-12D AH-16D DRAW-OUT 190 DISCONNECTED TEST CONNECTED 35 2-ø11 Length availble for conductor connection 90 t 25 e 25 d W TYPE OF ACBS a b d e t w AH-6D AH-10D AH-12D AH-16D N 505(max.) 205 b mounting holes 2-ø W a 509 Ø9 Earth terminal Mounting angle steel (not supplied) 157(3P) 257(4P) ø11 30 Length for conductor connection TYPE OF ACB b AH-6D 107 AH-10D,AH-12D 107 AH-16D 115 t Lifting plate ø Mounting angle steel (not supplied) LH 154(3P) 254(4P) 154 N 37 t b Mounting holes 4-ø Mounting holes 2-ø10 Mounting angle steel (not supplied) Use when vibration is excessive. Also make it removable for maintenance purpose. 31

32 Outline Dimensions 10.1 Outline Dimensions and Panel Mounting Details (in mm) For AH-20D TO AH-25D Note: N is neutral pole of 4-pole breaker. DRAW-OUT TYPE HL (3P) (4P) PANEL CUTOUT LH N (max.) 208(3P) (4P) 270(3P) 400(4P) (max.) Mounting holes 4-ø12 Projection of the mounting bolt into the draw-out cradle should be 11mm max. FIXED TYPE PANEL CUTOUT HL HL (3P) (4P) N Terminal blocks for control circuits (Left, Right) Screw M (3P) 363(4P) 248(3P) 378(4P) Mounting holes 2-ø12 32

33 Outline Dimensions Dimensions of Metalclad Construction (3P) WEIGHT (kg) TYPE No.OF POLES MOTOR CHARGING DRAW-OUT TYPE TYPE FIXED TYPE MANUAL CHARGINGDRAW-OUT TYPE TYPE FIXED TYPE AH-20D AH-25D (max.) 20 DISCONNECTED TEST CONNECTED 3-ø12 Mounting angle steel (not supplied) conductor connection Mounting holes 3-ø 12 Terminal blocks for control circuits 175 HL 36-M (3P) (4P) ø12 Length availble for conductor connection (3P) HL 328(4P) Extension rail N Mounting holes 2-ø12 Mounting angle steel (not supplied) Earth terminal M8 Lifting plate ø20 N Mounting holes 4-ø12 Mounting holes 2-ø12 Mounting angle steel (not supplied) Use when vibration is excessive. Also make it removable for maintenance purpose. 33

34 Outline Dimensions 10.2 Outline Dimensions and Panel Mounting Details (in mm) For AH-30D DRAW OUT TYPE Note: N is neutral pole of 4-pole breaker. PANEL CUTOUT LH HL (3P) (4P) N (3 P) Mounting holes 4-ø (4 P) Projection of the mounting 311(3 P) bolt into the draw-out cradle (4 P) should be 11mm max. (max.) (max.) FIXED TYPE PANEL CUTOUT HL HL (3P) (4P) N Terminal blocks for control circuits (Left, Right) Screw M4 Mounting holes 2-ø (3P) 434(4P) 289(3P) 449(4P)

35 Outline Dimensions Dimensions of Metalclad Construction (3P) WEIGHT (kg) TYPE No.OF POLES MOTOR CHARGING DRAW-OUT TYPE TYPE FIXED TYPE MANUAL CHARGINGDRAW-OUT TYPE TYPE FIXED TYPE AH-30D Length available for conductor connection : 55 Mounting angle steel (not supplied) 25 Mounting holes 3-ø 14 Terminal blocks for control circuits (3P) 36-M (4P) 578 N DISCONNECTED TEST CONNECTED Extension rail 620(max.) Earth terminal M Mounting holes 4-ø Mounting angle steel (not supplied) Length available for conductor connection : 55 Mounting angle steel(not supplied) Lifting plate ø N HL 236(3P) 396(4P) ø15 25 Mounting holes 2-ø12 Mounting angle steel (not supplied) Use when vibration is excessive. Also make it removable for maintenance purpose Mounting holes 4-ø14 35

36 Outline Dimensions 10.3 Outline Dimensions and Panel Mounting Details (in mm) For AH-40D DRAW OUT TYPE Note: N is neutral pole of 4-pole breaker. PANEL CUTOUT LH HL (3P) (4P) N (3 P) Mounting holes 4-ø (4 P) Projection of the mounting 311(3 P) bolt into the draw-out cradle (4 P) should be 11mm max. (max.) (max.) Mounting holes 3-ø (3P) (4P) Terminal blocks for control circuits 36-M4 N REAR VIEW M8 tapped hole for earth terminal 36

37 Outline Dimensions ISOLATED TEST CONNECTED Length available for conductor connection : 55 Mounting angle steel (not supplied) 25 SIDE VIEW Extension rail 620(max.) ø Mounting holes 4-ø Mounting angle steel (not supplied) WEIGHT (kg) TYPE No.OF POLES MOTOR CHARGING DRAW-OUT TYPE TYPE FIXED TYPE MANUAL CHARGING DRAW-OUT TYPE TYPE FIXED TYPE AH-40D

38 Outline Dimensions 10.4 Outline Dimensions and Panel Mounting Details (in mm) For AH-50C / AH-60C Note: N is neutral pole of 4-pole breaker. DRAW OUT TYPE HL (3P) (4P) PANEL CUTOUT LH N (3P) 266(4P) R 200 Draw-out handle (max.) (3P) 485(4P) 373.5(3P) 563.5(4P) (max.) 6-ø14 mounting holes Projection of the mounting bolt into the draw-out cradle should be 11 mm max (3P) (4P) Mounting holes 3-ø Terminal blocks for control circuits 36-M4 N REAR VIEW M8 tapped hole for earth terminal

39 Outline Dimensions Dust plate Front cover DISCONNECTED TEST CONNECTED Length available for conductor connection : 55 Mounting angle steel (not supplied) 25 SIDE VIEW 231 Extension rail (max) ø15 Dust plate surface 447 Mounting holes 6-ø14 Mounting angle steel (Not supplied) WEIGHT (kg) TYPE AH-50C AH-60C No.OF POLES MOTOR CHARGING DRAW-OUT TYPE MANUAL CHARGING DRAW-OUT TYPE

40 11.0 Connecting Diagram! with motor stored energy operation Electrical Connection Diagram 40

41 Electrical Connection Diagram 41

42 ACB Order Form 12.0 ACB Order Form Please fill this sheet for each type and specification separately. Tick the Box in front of each appropriate item and fill the Blanks. COMPANY S NAME ORDER NO. & DATE REQUIRED DELIVERY DATE RATING OF ACB REQUIRED 630A 1000A 1600A 2500A 4000A 6300A 800A 1250A 2000A 3200A 5000A QTY. NO. OF POLES 3 POLE 4 POLE AMBIENT TEMPERATURE 40 O C 50 O C MOUNTING FIXED DRAWOUT SAFETY SHUTTER 12/24 WAY AUX. ISOLATING CONTACT ASSY. * Additionally reqd. POSITION INDICATION SWITCH SHORT CIRCUIT CONTACTS NOS/ACB OPERATION MANUAL ELECTRICAL CLOSING COIL V AC/ V DC TRIPPING COIL V AC/ V DC MOTOR 230V AC 220V DC 110V AC 110V DC WITHOUT RELEASES MICROPROCESSOR BASED TRIP UNIT : µ IT (FOR INDL. APPLICATION) MICROPROCESSOR BASED TRIP UNIT : µ IT - G (FOR GENERATOR PROTECTION) RELEASES THERMAL MAGNETIC REQD. MAIN CT RATING A NEUTRAL CT RATING A SETTINGS : OVERLOAD A, SHORT CIRCUIT A, GROUND FAULT A SHUNT TRIP V AC/ V DC (230V AC SHUNT TRIP IS PROVIDED IN STANDARD ACB S) REQUIRED MAIN CT RATING A SETTING OF NON-ADJ. MAG. INST. TRIP KA AUX. SW. 3 NO + 2 NC AUX. SW. 5 NO + 5 NC AUX. SW. 7 NO + 7 NC ACCESSORIES TRIP IND. SW. OCR ALARM SW. SPRING CHARGE IND. SW. KEY LOCK KEY INTERLOCK SHUNT TRIP VOLTS 2 ACB s AC UVT - AUH Volts AC DC 3 ACB s DC Type of Control Device Reqd. with UVT ARO - 1B CLOSE-OPEN CYCLE COUNTER AUH -V-T AUH -V AUH -1 SC Reqd. with AOJ-1LC-GBX CAPACITOR TRIP VAC DOOR INTERLOCK SPECIAL REQUIREMENT (IF ANY) 42 Notes : For further details of Microprocessor based Releases, Please refer Catalogue/Price-list - NCT is provided alongwith releases having ground-fault Protection. This has to be mounted on Earth/ Neutral Bus-bar of Panel. - Where Under-Voltage Trip or No Volt Coil is provided Shunt Trip can be fitted. * For Manual Drawout ACB 12 way Auxiliary Contacts assembly is standard fitting * For Electrical Drawout ACB 24 way Auxiliary Contacts assembly is standard fitting. Please mention the numbers of Auxiliary Contacts required in addition to the standard fittings. Please mention if B & C type ACB is required. B & D is upto 630A~1600A, C & D is upto 2000A~4000A Committed to Excellence in Quality

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