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C Power ACB Manual

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L&T C Power
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  111 ** should not be removed while removing ACB from packing case. * overcurrent releases type DN1, SR18, SR18G or SR71, (when provided) are also mounted at the same location. 4-2  Rating label 2 Top cover  3 Arc chutes 4 Lifting lug ** 5 Breaker (Draw-out part) 6 Cradle (Fixed part) 7 ‘ON / OFF’ indication 8 Spring ‘Charged / Discharged’ indication 9 Operating handle10 Door interlock111 12 Position indication13 Lock in - ‘Isolated’ position / ‘Ang’ position14 Racking handle15 Bezel (to be mounted on panel door)16 Overcurrent release type SR21i * 17 Sealable sliding shutters for push buttons18 ‘Close’ push button19 ‘Trip’ push buttonRacking interlock11121412345678910131516171918Fig. 4-1 DRAWOUT ELECTRICAL ACB  111 Current transformer (for protection)Scraping earth (moving)Secondary isolating contacts (moving)Contact jawsSafety shutter Microswitch for positionindicationRacking screwDoor interlockRacking interlockSecondary isolating contacts (fixed)Earthing terminal at rear Scrapping earth (fixed)Telescopic railInterlock supportCradle facia 4-3 Door interlock pinLock in isolated / any position Voltmetric release terminationCradle terminal Arc chute clampsFig. 4-2 DRAWOUT ACB - REAR VIEWFig. 4-3 CRADLE - FRONT VIEW Note : Please do not put the breaker on its rear side.  111 4-4 CAUTION SPRING UNDER TENSION.PERSONAL INJURYMAY BE CAUSED ELECTRICAL HAZARD BEWARE OFELECTRICAL SHOCK,PERSONAL INJURY ORSCALDING BURNMAY BE CAUSEDWEAR PERSONAL PROTECTIVE EQUIPMENTWHILE CONNECTINGOR DISCONNECTING CAUTION  OPERATION   111 5-1 Presentation of Independent Manual Breakers ACB Closes in single stroke of handle TRIP / RESET PUSH BUTTONON - OFF INDICATOR        P       T       R       I    -        R       E      S       E       T  C L O S E FRONT VIEWSIDE VIEW21534 Fig 5-1 1 O F F  Fig 5-2 NO  Fig 5-3 MANUALLY OPERATED BREAKERS :Speed of closing is independent of the speed of handle movement.Initially breaker is OFF. 1. For carrying out any operation, the breaker-operating handle has to be pulled out fully by holding its top portion. 2. For extra leverage, the handle can be telescoped lengthwise (recommended) o  3. Rotate the handle by 90 in anti clockwise direction to reset the ACB.RESETTING :Turn the operating handle anti-clockwise till it becomes horizontal. The breaker will trip at the beginning of the resetting operation, if it is in closed condition. o  4. Rotate the handle by 90 in clockwise direction to close ACB.CLOSING :Turn the handle clockwise till it becomes vertical. 5. After completing the operation ensure that the handle is placed Back in the cavity on the front faciaThe sequence of operation is RESET CLOSE OPENCaution :Resetting the ACB in ‘ON’ condition will cause ACB to trip.Precaution :Ensure presence of supply voltage to undervoltage release (if fitted) before closing the ACB.In case of manual reset type ACB actuation of TRIP push button / key of lockable trip push button, resets the tripping mechanism of ACB OPERATION
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