Westinghouse DB-15 Instructions Manual
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Westinghouse DB-15 Instructions Manual

De-ion air circuit breakers
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RECEIVING
INSTRUCTIONS
AIR CIRCUIT BREAKERS
Types DB-15 and DB-25
DB-15
Type
15,000
Ampel'es
DB-15
Type
(Ampel'es)
15, 20, 25, 35, 50,
70,
90,
100,
150, 175, 200, 225
WESTINGHOUSE ELECTRIC CORPORATION
EAST PITTSBURGH PLANT
NEW INFORMATION
;
INSTALLATION
•
''De-ion''
600 Volts A-C
ZSO Volts D-C
Interrupting Rating
Rating of Series Coils
125,
SWITCHGEAR DIVISION
•
1.8. 35-225-1
MAINTENANCE
•
DB-25
Type
25,000
Ampel'es
DB-25
Type
(Ampel'es)
35, 50, 70, 90, 100, 125,
150, 175, 200, 225, 250,
300, 350, 400, 500, 600
EAST PITTSBURGH, PA.
EFFECTIVE SEPTEMBER, 1949
Printed in U.S.A.

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Summary of Contents for Westinghouse DB-15

  • Page 1 1.8. 35-225-1 RECEIVING INSTALLATION MAINTENANCE • • INSTRUCTIONS ''De-ion'' AIR CIRCUIT BREAKERS Types DB-15 and DB-25 600 Volts A-C ZSO Volts D-C Interrupting Rating DB-15 DB-25 Type Type 15,000 25,000 Ampel'es Ampel'es Rating of Series Coils DB-15 DB-25 Type Type...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS RECEIVING, HANDLING AND STORING Part One Page Inspection ............. . . Storing .
  • Page 3 Type "DB" Air Circuit Breaker-Exploded View..... . . DB-15 Outline Dimensions and Mounting Details ..... . .

  • Page 5: Classification A S T O Time-Current Characteristics

    Occasional checks on cali­ bration as well as on coordination and freedom of all moving parts, must be included in the maintenance schedule. Consult Westinghouse engineering and service personnel for recommendations pertaining to special operating or maintenance conditions.

  • Page 6: Operation

    ARC CHUTE AU XI Ll A RY-­ SWITCH CO NT ROL---- -- --t RELAY OVERCURRENT TRIP FIG. I. Type "DB" Air Circuit Breaker-Exploded View...

  • Page 7: Receiving, Handling And Storing

    Be sure that the contacts are clean and Net weights of Types DB-15 and DB-25 are given properly aligned. For a description of contact align­ in Table No. 1 below.

  • Page 8: Part Two Installation

    PART TWO INSTALLATION Type "DB" circuit breakers are furnished as com­ differ and should be obtained from the appropriate plete unit assemblies and the installation consists outline drawing. (1) bolting them to the supporting framework The following procedure applies to all enclosures: or structure;...
  • Page 10 � 4 4..!.. <t_ BKR. <t. B KR. MIN. � 7� B KR. 7E... � c:::J VIEW "s" VIEW " A " VIEW "c" CUTOUT I N DEAD FRONT DOOR OR COVER FRONT VIEW OF STUD LOCATIONS, FRO NT VIEW OF STUD LOCATIO N, CUTOUTS DRILLI NG FOR MOU NT­...
  • Page 11 SHUNT TRIP BOT. AUX.SW. WIRING DIAGRAM (F.V.) WIRING DIAGRAM (F.V.) FIXED PANEL REV ERSE CURRENT � OPERATION SEQUENCE · 1 �-� 1 1 ---- ---- r-- -- -- -, I. CONTROL SW. CS-C CLOSED. � 2. "X" REL AY PICKS UP a SEALS IN THRU AUX. CONTACT "x": ,-FL-, 3.
  • Page 12 -� 12 !! 2 7 1. � -J2 ;i 17 i\ 16.L 9 08-15 FINGER CLUSTER 4i x 3jx3 DIA. TOP AND BO TTOM !"ll"l CUSTOMER ' S CABLE TWO CABLES SHOWN- WHEN SINGLE CABLE IS USED, INSERT CABLr IN 3 KN0 2 C 3 KO ��...

  • Page 13: Part Three Maintenance

    A small quantity of oil is placed on th�dle shaft, the roller lever roller, and the lat The DB-15 contacts are adjusted to obtain lA-inch the factory. The tripping load should not exceed horizontal travel of the cross bar after the contacts 14 ounces measured at the trip screw.
  • Page 14 TATIONARY ARCING CONTA CT ROLLER L E V ER OIL HOLE CLOSING S OL ENOID FIG. 6. Cross-Sectional View of Type DB-25 Circuit Breaker...

  • Page 15: Overcurrent Tripping Device

    The overcurrent tripping devices of the various tripping devices of ampere ratings up to a maximum ampere ratings are of the same general construction of 225 amperes can be applied to the DB-15 circuit and size. (See Figs. 7 and 7A).
  • Page 16 I 00 �8 � U> 3.5 ;:: � "' � � 1.5 DB-25 DB-15 INSTANTANEOUS PICKUP (1000%) (I NT RTG. 25000 A.) (INT. RTG.I5000 A.) �- -� COIL RATINGS (AMPS.) COIL RATINGS (AMPS. ) 1 25 1 00 12 CYCLES 1 00 .
  • Page 17 "D B " AIR CIRCUIT BREAI4�ERS P ''""' 1000 D -YI-+ 7 ::::! 6 3:: <.) "-' � "-' CURVE A 70 AMP. LOAD BREAKER WITH LONG TIME DELAY INST TRIP CURVE C 300 AMP. BREAKER WITH LONG TIME DELAY INTERMEDIATE SHORT TIME DELAY �...

  • Page 19: Control Relay

    RELA Y MOLD STOP SUR F A C E RELEA S E LEVER RELE A S E S CREW LOCATION - �� � ? -- - - ---- - - - -- -� � � � � - �� - c=- r-�---------1-�...

  • Page 20: Shunt Trip Attachment

    STATIONARY FRAME CORE MOVING CORE LOCATION TRIP LEVER DETAILS FIG. 10. Shunt Trip Attachment-Location and Construction Details SHUNT TRIP ATTACHMENT spring load and consequently raises the drop-out voltage. Turning the screw out lowers the drop-out shunt trip mounts on top of the platform ·...
  • Page 21 LOCATION DETAILS RESET LEVER SCREW TRIP BAR r ., COVER MICARTA STATIONARY CORE FIG. 1 1. Undervoltage Trip Attachment-Location and Construction Details...

  • Page 22: Undervoltage 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 23 direction of current flow in that pole is reversed. When the series coil current is flowing in the for­ ward direction, armature movement is prevented by a stop. When the series coil current is reversed, the armature rotates in the opposite direction to trip the breaker.
  • Page 24 LOCATION I I . r,===i I I i / � ADJUST FOR I STATIONARY CONTACT CROSS BAR INSULATING Ll N DETAILS . I . l�- - J FIG. 14. Field Discharge Switch-Location and Construction Details...

  • Page 25: Field Discharge Switch

    FIELD DISCHARGE SWITCH �aintenance. Remove power from the break­ er, clean the contacts if necessary, check the contact The field discharge switch is ordinarily used with gap and adjust if necessary. Check for loose bolts. a two-pole breaker, and mounts on the center mould­ ed pole unit base.

  • Page 26: Alarm Switch Attachment

    ALARM SWITCH ATTACHMENT Inspection. Close the breaker manually and trip by rotating the breaker handle to be sure the The alarm switch mounts above the shunt trip alarm contacts do not "make". Repeat the above attachment (see Figs. 16 and 16A) and will energize procedure except trip by raising the trip bar and the alarm circuit on all opening operations except­...
  • Page 27 "DB" AIR CIRCUIT BREAKERS LOCAT I ON C O I L FRAM E MOVI NG CORE BRAC KET DETAI L S FIG. 17. Electric Lockout Attachment-Location and Construction Details •...

  • Page 28: Key Interlock Attachment

    LOC K CY L I NDER LOC AT I ON FIG. 18. Key Interlock Attachment-Location and Construction Details KEY INTERLOCK ATTACHMENT position . The key is then removable and the break­ er handle is locked in the tripped position. Replace The key interlock mounts on the right side of the key, apply force in the counterclockwise direc­...

This manual is also suitable for:

Db-25

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