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Westinghouse De-ion DB-15 Instructions Manual

Air circuit breakers, 600 volts a-c, 250 volts d-c
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Instructions for De-ion®
Air Circuit Breakers
Types 08·15, 08·25, DB·F & DBL-25
600 Volts A·C, 250 Volts D·C
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Westinghouse Electric Corporation
Switchgear Division, East Pittsburgh, Pa.
I.B. 33-850-1 & 2E Effective May, 1965. Supersedes issue Se p tember, 1963.
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  • Page 1 600 Volts A·C, 250 Volts D·C .. >: ;' ; : : S ; �,i "; ] ·,:. -· " !. : :, • Westinghouse Electric Corporation Switchgear Division, East Pittsburgh, Pa. I.B. 33-850-1 & 2E Effective May, 1965. Supersedes issue Se p tember, 1963.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS RECEIVING, HANDLING AND STORING Part One Page 6 ............. Inspection.
  • Page 3 I.B. 33-850-1 & 2E "DB" AIR CIRCUIT BREAKEI\5. LIST OF ILLUSTRATIONS Page Figure Type "DB" Air Circuit Breaker-Exploded View ...... . Ventilated Enclosures-Outline Dimensions and Mounting Details ..2A Type DB-15 and DB-25, 3 Position Operating Mechanism ..
  • Page 4 Con­ sult Westinghouse engineering and service link between the power source and associated pro­ ductive equipment. This breaker is built to operate...

  • Page 6: Receiving, Handling And Storing

    Remove tape from top of ating mechanism should be lubricated approxi­ arc chutes. mately every 10,000 operations. Molybdenum disul­ fide mixed with oil (Westinghouse M8577-ll) is INSPECTION recommended. The "DB" breaker assembly consists of a coor­...

  • Page 7: Part Two Installation

    PART TWO I. B . 33 -850-1 & 2E "DB" AIR CIRCUIT B REAKERS INSTALLATION Type "DB" circuit breakers are furnished as com­ other enclosures except subway and explosion­ plete unit assemblies and the installation consists proof. The mounting dimensions differ for these and bolting them to the supporting framework should be obtained from the appropriate outline or structure;...
  • Page 10 � � -BKR. � BKR. BKR. THE FOLLOWING ATTACHMENTS CAN BE SUPPLIED WITHOUT INCREA SING OVERALL D IM'S. I. AUXILIARY SWITCHES- (8 CIRCUIT M A XIMUM) FOR 3 POLE BKR. ONLY 2.UNDERVOLTAGE TRIP '"'1 3. OPERAT I ON COUNTER 4. A L ARM SWITCH 5.
  • Page 11 �DIA. t::: ::J <t <t_ � BKR. BKR. 13M IN. BKR. t::: ::J 3.2.. 8 VIEW "B" 9-zMIN. OUT IN DEAD FRONT DOOR VIEW " A " OR COVER VIEW "c" STUD LOCATION, CUTOUT B DRILLING FRONT VIEW OF STUD LOCATIONS, CUTOUT B DRILLING FRONT VIEW OF FOR MOUNTING 3-POLE BREAKER WITH 2 OR 3...

  • Page 12: Maintenance

    PART THREE MAINTENANCE POLE UNIT The DB-15 contacts are adjusted to obtain %2 to lf s inch gap between the armature plate and the Each pole unit is mounted on a separate molded steel link. As the contacts burn away it will be base through which the breaker studs pass.

  • Page 14: Operating Mechanism

    OPERATING MECHANISM The operating mechanism (see Fig. 5) non­ adjustable and consists of a series of steel links de­ signed to secure low closing and tripping forces. To check for friction, raise the trip bar and slowly rotate the manual operating handle in close and trip direction.
  • Page 15 "DB" AIR CIRCUIT B REAKERS Table No. MOUNTING BOLT SIZES used, otherwise, the .ends of the bolts may jam against the coil and short circuit some of the turns. 08-15 BOLT 08-25 To adjust the trip nut for proper tripping, first �...
  • Page 16 ' f'I o '••• · · • · • ·• : · , • •:::- • · ' ! jj l, �) •' � :�: < �: ::: k . +�.J4- · ..: ::.:. · ·• •. ···<"'· •.. ·" ..·...
  • Page 17 • • •• . 01 . 04 TRIPPI'18 DB-15 & Dll-25 • Westinehouse Elect. Corp DUAL SELECTIVE OVERCURREiiT TR:i:PPI!l::i . Cf!ARAC'lERISTICS ... TIME-CURRENT CHARACTERISTIC CURVES Fast Pittsburgh, Pa. DEVrcr·von .GRC11W. OJ(. TIE.1iiiEM<EiiS ..Fuse Link.. ln....
  • Page 20 T R I P I· �F MAGNET YOK E TRIP SADDLE ARMATURE TIMING VALVE � SERIES COIL RESET VALVE SECONDARY ARMATURE LONG DELAY ADJUSTMENT DIAPHRAM SHORT DELAY ADJUSTMENT PULL LIN K LONG DELAY PIC K ADJUSTMENT CHAMBER SHORT D ELAY PICK ADJUSTMENT �))

  • Page 21: Operation

    barely trip the breaker. Several trials may be The operation of this selective device is the same Next tum the trip nut upwards three necessary. as the dual overcurrent tripping device, except, quarters tum to provide overtravel. This completes that in this case, the long delay and instantaneous •...
  • Page 23 CO I L RELAY MOLD STOP SURFACE COV ER MOVING S TATIONARY CONT. L.P. R .P. LOCATIO N • I 1 I r--------+ RELEASE RELEASE LEVER LEVER 16 1 R E LA Y---- -1 RELEASE ARM DETAILS ARC CHUTE FOR D-C ONLY FIG.

  • Page 25: Control Relay

    , � F R A M E M O V I N G C O R E LOCAT I O N T R I P L E V E R D E TA I LS FIG. 10. Shunt Trip Attachment-Location and Construction Details It is non-adjustable and is intended for intermit­...
  • Page 28 and consequently the reset lever, in the reset posi­ tion. When the coil voltage is reduced sufficiently, the reset lever spring overcomes the magnetic at­ traction of the cores and rotates the reset lever clockwise. As the reset lever rotates, it carries with it the latch pin which rotates relative to the latch until the latch is released.

  • Page 30: Undervo1Tage Time Delay Attachment

    UNDERVOLTAGE TIME DELAY ATTACHMENT The undervoltage air dashpot time delay attach­ ment mounts on the front of the undervoltage trip, replacing the moving core cover. (See Fig. 12) . The needle valve screw in the top regulates the opening through which the air is forced and con­ sequently the time delay.

  • Page 32: Field Discharge Switch 2

    LO C A T I O N r,= :=! '11 6 3�6 ADJUST SLEEVE S E CURE B REAK FIE LD DISCHARGE CONTACT WHEN BREAKER ARC ING CON. T.A CTS TOUCH CLOSING • STA TIONA R Y CONTACT CROSS B A R INSULATING LIN K STOP SUR FACE...

  • Page 34: Field Discharge Switch

    "DB" AIR CIRCUIT BREAKERS laspection. When the series coil current flowing the for­ Close the breaker manually, and ward direction, armature movement is prevented by push backward on the spring stud located on the bottom of the armature, to trip the breaker. a stop.

  • Page 36: Auxiliary Switch

    • AUXILIARY SWITCH Table No. INTERRUPTING CAPACITY The auxiliary switch mounts on top of the plat­ INTERRUPTING CAPACITY IN AMPERES form to the left of the operating mechanism. (See VOLTS am­ Figs. 15 and 15A). The contacts will carry 15 Non-Inductive Circuli lnducUve Circuit peres continuously or 250 amperes for 3 seconds.

  • Page 40: Electric Lockout Attachment

    LEV E R LOCK CYLINDER LO CAT I O N FIG. Key Interlock Attachment For Fixed Breaker-Location and Construction Details by operating the push to trip button or electrically energized. The lockout coil can be de-energized by energizing the shunt trip coil (when electrical after closure of the breaker, desired.

  • Page 42: Key Interlock Attachment

    • KEY INTERLOCK ATTACHMENT internal wiring is connected to the back (For Fixed Breakers) terminals, leaving the front terminals for the cus­ tomer's wiring. The left side of the front cover is The key interlock mounts on the right side of open to permit entrance of the customer's wires the operating mechanism frame.
  • Page 43 •...

This manual is also suitable for:

De-ion db-25De-ion db-fDe-ion dbl-25

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