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INSTRUCTIONS ANDRECOMMENDED PARTSFOR MAINTENANCE
GEI-887611Supersedes GEI-88761H
:
MAGNE-BLAST CIRCUIT BREAKER© TYPES
AM-4.16-250-6AM-4.16-250-7AM-4.16-250-8
© ;:: :i!
CONTENTSIntroduction . . . . . . . 3• • •Receiving, Handlingand
Storage . . . . . . . 3• • •Installation . . . . . . . 4• •
•Description ofOperation . . . .
^Adjustments . . ..General Maintenance . . . .1 4. • 4• • • •
•
;. . . 10• •
Renewal Parts 28
SWITCHGEAR PRODUCTS DEPARTMENT
© E L E C T R I CG E N E R A LP H I L A D E L P H I A , P A
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m
MAGNE-BLAST CIRCUIT BREAKERAWI-4.16-250-7 MAM-4.16-250-6
AM-4.16-250-8 (^)Letter Designation B, C, H, K, and N, used
immediately following the model numberindicates basic design
features..A
INTRODUCTIONage, current, and interrupting ratings are
neverexceeded 0
The magne-blast breaker is the removable andinterchangeable
interrupting element used in metal-
4f%clad switchgear to provide reliable control and pro-tection
of electrical apparatus and power systems.
The AM-4.16-250 Magne-blast Breaker is avail-able with
continuous current ratings of 1200 amperesand 2000 amperes in
accordance with applicableindustry standards.plate for complete
rating information of any par-ticular breaker. The nameplate also
describes thecontrol power requirements for that breaker.
Theapplication of a breaker must be such that its volt-
Since this book is written to include ,all ratings of the
breaker as well as several design !variations, the instructions
will be of a general )character and all illustrations will be
typical unlessotherwise specified.
PROPER INSTALLATION AND MAINTENANCEARE NECESSARY TO INSURE
CONTINUED SAT-ISFACTORY OPERATION OF THE BREAKER. Thefollowing
instructions will provide complete infor-mation for placing
magne-blast breakers in serviceand for maintaining satisfactory
operation.
Refer to the breaker name-
RECEIVING, HANDLING AND STORAGE
Receiving and Handling against condensation, preferably by
storingit in a warm dry room, since water absorp-tion has an
adverse effect on the‘insulationparts. Circuit breakers for outdoor
metal-clad switchgear should be stored in theequipment only when
power is availableand the heaters are in operation to pre-vent
condensation.
Each breaker is carefully inspected and packedIplgor shipment.
Immediately upon receipt of the%J
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GEI-88761 Magne-blast Circuit Breaker
INSTALLATION1. Remove the box barrier and mechanism
cover and make a visual inspection to as-certain that the
breaker and mechanism isin satisfactory condition. Check all
bearingsurfaces of the mechanism for lubrication.Refer to section
on lubrication page 16 andFigure 17.Charge the breaker closing
springs man-ually using a 5/8” ratchet wrench to turnthe driving
eccentric (6) Figure 1. Turningthe eccentric counter clockwise will
advancethe ratchet wheel and compress the springs.When the springs
have reached the fullycharged position the indicator (1) will
read’’CHARGED”, and the driving pawl will beraised from the ratchet
wheel teeth,ditional turning of the eccentric will notadvance the
ratchet wheel.
OR MECHANISM UNLESS THE CLOSINGSPRINGS ARE BLOCKED AND THE
OPEN-ING SPRINGS HAVE BEEN TRIPPEDOPENOR MECHANICALLY
BLOCKED.PRECAUTION IS REQUIRED TO PREVENTACCIDENTAL CLOSING OR
TRIPPING.
THIS
The closing springs should now be un-blocked. Rotate the driving
eccentric untilthe indicator reads ,lCHARGED” and theratchet wheel
does not advance. The springblocking device can now be removed.
3. Connect the test coupler to the circuit ^y|jbreaker and
operate it electrically severaltimes. Check the control voltage as
de-scribed under ’’CONTROL POWER CHECK”(Page 14 ).4. Disconnect the
test coupler and replace box
barrier.5. If the breaker has been stored for a long
period of time, it is recommended thatthe insulation be checked
with a standard60 hertz high potential test. Refer toInsulation
Test (Page 16).
2.
?!
Ad- iInsert the spring blocking device (10) andmanually
discharge the springs against thepins by pushing the manual release
button(4 ). The springs are now blocked and slowclosing of the
breaker contacts can beaccomplished by again turning the
drivingeccentric with a 5/8” ratchet wrench.During the slow closing
operation check toinsure that the mechanism does not stickor bind
during the entire stroke, that itlatches securely in the closed
position, andthat it trips freely when the manual triplever is
operated. At this time, also checkthe following adjustments:
a. Arcing contact wipe (Refer to page 10)b. Primary contact wipe
(Refer to page 11)c. Primary contact gap (Refer to page 11)
If the breaker secondary wiringNOTE:is to be given a
hi-potential test at 1500volts, remove both the motor leads fromthe
terminal connection. Failure to dis-connect the motor from the
circuit maycause damage to the winding insulation.6. Lubricate the
silver portion of the ballcontact at the top of the breaker
bushingby applying a thin film of contact lubricantD50H47.Refer to
metal-clad instruction book GEH-1802 for instructions on inserting
the break-er into the metal-clad unit.
7.DO NOT WORK ON EITHER THE BREAKER
DESCRIPTION OF OPERATION
The Magne-blast Breaker has two principal com-ponents; the
breaker element and the operatingmechanism:
stored energy type designed to give high speedclosing and
opening. The mechanism will operateon a-c or d-c voltage as
indicated on the breakernameplate. Closing and opening operations
arecontrolled either electrically from the metal-cladunit and
remote location, or mechanically by themanual close and trip levers
on the breaker. Allsecondary connections from the breaker to the
metalclad unit are made through the coupler (1) Fig. 2.A spring
release interlock, Fig 3, is providedto discharge both the closing
and opening springswhen the breaker is withdrawn from or
insertedinto the Metal Clad unit.
The breaker element is three similar pole units,each of which
includes the current carrying parts,main and arcing contacts,
interrupter, and anenclosing barrier system that provides
insulationbetween poles, or phases and to ground. The pri-
' mary connections to the associated metal-cladswitchgear are
made through the ball contacts atthe top of the breaker
bushings.The operating mechanism type ML-13 is of the
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Figure 1. (8034475) Spring Blocking Device1. Charge-Discharge
Indicator2. Support Bolts3. Driving Pawl4. Manual Close Lever5.
Motor6. Eccentric7. Closing Spring8. Manual Charging Wrench9.
Fuse
10. Spring Blocking Device
Figure 2. (8034473) Left Side View ML-13Operating Mechanism
1. Secondary Coupler2. Interlock Switches3o Auxiliary Switch4.
Latch Checking Switch5. Switch Cam6. Charge-Discharge Indicator7.
Closing Latch Roller8. Power Switches9. Closing Latch
10. Closing Springs11; Motor12. Fuses
Figure 3. (8038805) Spring Discharge Linkage1. Link2. Adjusting
Bolt3. Trip Latch Crank4. Discharge Crank5. Adjusting Clevis6.
Spring Release Crank
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"
GEI-88761 Magne-blast Circuit BreakerWhen the breaker is used
interchangeably withtype MS-13 solenoid operated breakers in
M-26metal-clad units, fuses (12) Figure 2, are mountedon the
breaker for protection of the motor andposing circuit. These
breakers are identified bya "C" or "K" suffix in the breaker
nomenclature.In cases where breakers with type ML-13mechanisms must
match and line up with breakers
having type ML-11 mechanisms the spring chargingcircuit for both
mechanisms should be fused withBuss Company Fusetrons as
follows:
A positive interlock (3) Figure 4 and interlockswitch (2) Figure
2, are provided between thebreaker and metal-clad unit to prevent
raisingor lowering of the breaker in the unit while in aclosed
position and to prevent a closing operationwhen the breaker is not
in either the fully raisedor lowered position. To insure that this
interlockwill function during manual, as well as duringelectrical
operation of the equipment, both mechan-ical and electrical
blocking is provided. If forany reason the closing springs should
be dis-charged against the positive interlock the mechan-ism will
be jammed and be inoperable. Themechanism can be released and
returned to thereset position by pushing in on the trip lever
(8)Figure 5. It may require more than normalforce to release the
interlock.
A plunger interlock, Figure 14 can be providedwhen required to
operate a stationary auxiliaryswitch and/or a rod interlock mounted
in the metal-clad unit.
Cont. Volt. Fuse Size Cat. No.a48v d-cHOv d-c
125v d-c115v a-c220v d-c250v d-c230v a-c
10A FRN 10FRN 4FRN 4FRN 4FRN 2.5FRN 2.5FRN 2.5
4A4A4A
2.5A2.5A2.5A
Spring Charging
The mechanism has a high speed gear motor(10) Figure 5, that
compresses a set of closingsprings through the action of an
eccentric, ratchet,and pawl assembly. The rotary action of the
motoris converted to a straight stroke through the eccen-trie (11)
Figure 4, and a lever that carries a spring ^p)loaded driving pawl
(3) Figure 1.
miWPFigure 4. (8034463) Right Side View ML-13
Operating MechanismFigure 5. (8034471) Front View ML-13
Operating Mechanism1. Upper Spring PinLatching PawlsPositive
Interlock RollerOpening SpringCam ShaftRatchet WheelBearing
BlockDriving PawlLower Spring PinDriving Pawl LeverEccentricClosing
Spring
2.3. 1. Auxiliary Switch
Open - Close IndicatorTrip CoilProp SpringOperation CounterTrip
LatchCharge-Discharge IndicatorManual Trip LeverManual Close
LeverMotor
4. 2 .5. 3.6. 4.7. 5.8. 6.9. 7.
10. 8.11. 9.12. 10.
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Magne-blast Circuit Breaker GEI-88761ed" and the driving pawl is
raised from theratchet wheel. The use of the ratchet wrenchprovides
for maximum safety in the event thatcontrol power is suddenly
restored without warning.In this event, the motor drive will
override theratchet wrench and continues to charge the
springs.Closing Operation
The breaker can be closed electrically byenergizing the spring
release solenoid (15) Figure6, or manually by pushing the close
button (9)Figure 5. In either method the closing latch isrotated
from under the closing roller to releasethe closing springs (10)
Figure 2. The energyin the springs is used to rotate a cam (16)
Figure7 and close the breaker through the operatingmechanism
linkage. During the closing operationthe mechanism is trip-free at
all times. The break-er is held closed by the closing prop (14)
movinginto position under the prop pin (13). During theclosing
operation the opening springs (4) Figure 4,are compressed and held
ready for an openingoperation with the trip latch (8) Figure 7
bearingagainst the trip latch roller (9).
When the closing operation of the breaker iscompleted and the
closing latch is fully reset,
The pawl advances the ratchet wheel (6) Figure 4a few degrees
each stroke where it is held in pos-ition by the latching pawls
(2). When the ratchet
f*%vhpel has been rotated approximately 180 degrees^the closing
springs (12) will be fully compressed.As the ratchet wheel
continues to rotate, the springload will shift over center and
attempt to discharge.After a few degrees of rotation, the closing
roller(7) Figure 2, will engage the closing latch (9) andthe
compressed springs will be held by the latchuntil a closing
operation is required. During thelast few degrees of the ratchet
wheel rotation thepower switches (8) are opened and the
drivingpawlis raised from the ratchet wheel surface. Thisallows the
motor and driving mechanism to coastto a natural stop expending all
residual energy.
During the time the springs are being com-pressed a relay (17)
Figure 6, is energized to holdthe closing circuit open. The relay
remainsenergized until the springs are fully charged andthe control
switch contacts are re-set.
The closing springs may be charged manuallyif control voltage is
lost. A 5/8" ratchet wrenchcan be used to rotate the eccentric in a
counterclockwise direction until the indicator reads"Charg-
1011121314151617
Figure 6. (8034467) Control Mechanism1. Latch Checking Switch2.
Switch Cam3. Switch Striker4. Switch Support Bolts5. Switch
Support6. Closing Latch Roller
7. Power Switches8. Closing Latch9. Closing Latch Shaft
10. Latch Adjusting Screw11. Release Coil Bolts12. Closing Latch
Spring
13. Latch Monitoring Switch14 o Switch Mounting Bracket15.
Spring Release Solenoid16. Release Coil Support17. Control
Relay
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I
GEI-88761 Magne-blast Circuit Breakerthe contacts of the latch
monitoring switch closesto permit the spring charging motor to be
energiz-ed and recharge the closing springs.Opening Operation
The breaker can be opened either electricallyby energizing the
trip coil (3) Figure 5, or man-ually by pushing the trip lever (8).
In each methodthe trip latch is rotated off the trip latch
roller,permitting the operating mechanism linkage tocollapse. The
energy stored in the opening springsis released to provide the
required opening speedfor successful interruption of the
circuit.
As the breaker opens to interrupt a current,the arc first starts
at the arcing contacts (6 & 27;Figure 8, transfers to the arc
runner (4 & 10)^and energizes the blow-out coils (3 & 11).
This||j|action introduces a magnetic field between the^^pole pieces
(5 & 9) of the interrupter that forcesthe arc deeper into the
arc chute (8). At the timethe arcing contacts part a discharge of
air isexpelled through the booster tube (28) acrossthe arc. This
air flow assists the arc transferand interruption by blowing the
arc away from thecontacts and into the arc. chute. The
magneticfield forces the arc deeper into the interrupteralong the
diverging arc runners.
i
24 JJ t-v/ v• - 'la 'V iI I! r~ :.* /\l !n :!
0_ V" f\LA. ‘V .o' x."X _t3.c13
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14
15 //25
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Fig. 7 (0114C5320) Sectional Side View of MechanismI1.
Handle
Trip Coil SupportTrip CoilTrip ArmatureProp Reset SpringCam
Follower RollerTrip ShaftTrip LatchTrip Latch Roller
10. Trip Latch Roller Support11. Crankshaft12. Cranks13. Prop
Pin14. Prop15. Drive Shaft16. Cam.17. Check Nut
18. Stop Plate19. Spring Rod20. Spring21. Spring22. Spring
Guide23. Stop Pin24. Main Shaft Bearing25. Cam Shaft Bearing
2.! 3.4.5.6.7.8.9.
8
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jR*sl
Magne-blast Circuit Breaker GEI-88761
CD
141516
17r\
2 185 19
2042152262324
- 8 252627
9 2829
10I t \ 30\\2 i
I fU$-t3 CO
Fig. 8 (0258C0689) Cross Section of Breaker Pole Unit21.
Operating Rod22. Stationary Primary Contacts23. Movable Primary
Contacts24. Cup Bearing25. Yoke26. Movable Contact Arm Assembly27.
Movable Arcing Contact28. Booster Tube and Piston29. Connection
Bar30. Booster Cylinder
11. Lower Blow-out Coil12. Lower Blow-out Core13. Lower
Barrier14o Front Bushing15. Rear Bushing16. Frame17. Main Operating
Crank18«, Upper Horizontal Barrier19. Spring Retainer20. Lower
Horizontal Barrier
1. Box Barrier HandleUpper Blow-out CoreUpper Blow-out CoilUpper
Arc RunnerUpper Pole PieceStationary Arcing ContactBox BarrierArc
Chute SideLower Pole PieceLower Arc Runner
2.3.4.5.6.7.8.9.
10.9
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I !
GEI-88761 Magne-blast Circuit BreakerThe arc chute has a series
of interleaving cer-
amic fins, Figure 19. As the arc is forced into theinterrupter
it is lengthened in the gradually deep-ening serpentine path
between the fins so that theelectrical resistance of the arc is
rapidly increasedand its heat is absorbed by the ceramic
material.The increased resistance reduces the magnitudeand phase
angle of the current and at an earlycurrent zero the arc cannot
re-establish itselfand interruption occurs.
Trip Free Operation
If the trip coil circuit is energized while thebreaker is
closing, the trip armature will forcethe trip latch (8) Figure 7
away from the triproner (9) causing the mechanism linkage to
colla;and the breaker to re-open. The closing camwill complete its
closing stroke and the springswill re-charge as in a normal closing
operation.
pse(16)
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i ADJUSTMENTSMECHANISM UNLESS THE CLOSINGSPRINGS AREBLOCKED AND
THE OPENING SPRINGS HAVEBEENBLOCKED.PREVENT ACCIDENTAL CLOSING OR
TRIPPING.
All adjustments should be checked during per-iodic inspections
and whenever it becomes nec-essary to repair or replace parts that
have becomeworn or defective while in service. The
followingadjustments are listed in the order in which theyare to be
checked after removing the box barriersand front cover from the
breaker.
TRIPPED OPEN OR MECHANICALLYTHIS MEASURE IS REQUIRED TO
Arcing Contact Wipe
Refer to Figure 9. Close the breaker untilDO NOT WORK ON EITHER
THE BREAKER OR::
7l
« y\J i
'r . _* +° MIN
J 2 2)3 3i4 U\ •57
Primary Contact Wipe Arcing Contact Wipei?;
Figure 9B. "-8” Contact Structure (0132C2709)Figure 9 Contact
Adjustments
1. Stationary Primary Contacts 5.2. Movable Primary Contacts3.
Buffer Block4. Stationary Arcing Contacts
Movable Arcing Contacts6. Contact Arm7. Throat Bafflej
Is
10
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Magne-blast Circuit Breaker GEI-88761This can bethe arcing
contacts just touch,
determined with the use of a circuit continuitytester such as a
light indicator or bell set. In
H this position, the gap between the stationaryprimary*contacts
(1) and the movable primary contact (2)should be 5/16" or greater.
This setting has beenmade in the factory and no adjustment is
provided.A wipe of less than 5/16" is an indication that thearcing
contacts need to be replaced. When makingthis check, see that the
movable arcing contact (5)passes between the probes on the upper
arc runnerwithout touching. On the "-8" design, also checkfor
clearance between the arcing contact (5) andthe slot in the throat
baffle (7) during entire strokeof the moving contact assembly.
Primary Contact Gap
Refer to Figure 10. With the breaker closed,press the manual
trip button allowing the breakerto trip open normally. Do not force
the contactsopen wider by hand. The gap between the
stationaryprimary contacts (5) and the movable primary con-tact (8)
measured between the closest points, shouldbe 3 5/8" to 3 15/16".
To change this gap, loosenthe check nut (17) Figure 7, and turn the
adjustingnut (18) on stud (19). Screwing the adjusting nutdown
willdecrease the primary contact gap. Tightenthe check nut and
re-measure the contact gap(close and trip the breaker before
checking themeasurement). Whenever the primary contact gapis
changed, the primary contact wipe should berechecked and, if
necessary, readjusted.
WHEN WORKING ON THE MECHANISM IN THECLOSED POSITION, KEEP
FINGERS CLEAR OFTHE LINKAGE, AS ACCIDENTAL TRIPPING CANCAUSE SEVERE
INJURY.Trip Latch Wipe
Refer to Figure 7. The wipe of the trip latch(8) on the trip
roller (9) should be from 3/16"to l/4". This can be measured by
putting a filmof grease on the latch (8), closing the breakerpart
way, and tripping. The mechanism has theproper trip latch wipe when
the latch rests againstthe stop pin (23). No adjustment is provided
anda visual inspection is usually all that is required.If this
setting is not correct, look for insufficienttravel of the trip
shaft (7).Trip Armature Travel
Refer to Figure 7. The trip armature (4)should have 7/32" to
9/32" travel before the triplatch (8) starts to move. This can be
adjusted bymoving the trip coil support (2) and/or by adjustingthe
trip armature screw (12) Figure 11. Alocking screw located behind
the trip armature^crew must first be loosened. Retighten
lockingscrew after making adjustment.Release Latch Wipe
} Primary Contact Wipe
Refer to Figure 9, when the breaker is closedthe stationary
primary contacts (1) should risefrom 1/4" to 5/16". Before checking
this dimen-sion be sure the mechanism is re-set so thatthe prop pin
(13) Figure 7 is resting on the prop..To obtain the proper contact
adjustment, openthe breaker and, referring to Figure 10, loosen
thecheck nut (4) and turn the adjusting nut (3). Screw-ing up on
the adjusting nut will decrease the primarycontact wipe, down will
increase it. Tighten thecheck nut, close the breaker and recheck
the wipe.With the primary contact wipe correctly adjusted,the
clearance between the contact arm (6) Fig-ure 9 and the buffer
block (3) should be 1/16" orgreater when the breaker is fully
closed.
Refer to Figure 6. The wipe between the releaselatch (8) and
roller (6) should be 3/16" to 1/4".If re-setting is required,
loosen, set, and re-tighten adjustment nut and screw (10).Release
Latch Monitoring Switch
Refer to Figure 6. The release latch must befully re-set and the
latch monitoring switch (13)operated before the motor will start.
When thelatch is fully reset the clearance between the
switchstriker arm and the switch mounting bracket (14)is 1/32" or
less, this can be adjusted by bendingthe striker arm.
Figure 10. (8039618) Adjustable Coupling ForMaking Primary
ContactWipe Adjustments
1. Operating Rod2. Operating Rod Pin3. Adjusting Nut4. Check
Nut5. Stationary Primary Contacts6. Yoke7. Contact Arm8. Movable
Primary Contacts
Motor and Relay Switches
Refer to Figure 6. With the closing springsblocked rotate the
switch cam (2) until the switch
11
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GEI-88761 Magne-blast Circuit Breaker
s
Figure 11. (8039585) Auxiliary Switch andTrip Coil
1. Open - Close Indicator2. Auxiliary Switch3. Prop Spring4.
Trip Latch Spring5. Spring Discharge Crank6. Cotter Pin7. Trip Coil
Support8. Trip Coil9. Mounting Bolts
10. Latch Set Screw11. Trip Latch12. Trip Arm Screw13. Manual
Trip Lever
Figure 12. (8034474) Positive Interlock Switch1. Positive
Interlock Shaft2. Switch Arm3. Switch Support4. Interlock Switch5.
Auxiliary Switch6. Switch Support7. Latch Checking Switch8. Switch
Arm9. Trip Shaft
s
1
striker (3) has traveled the maximum amount(about 180 degrees
rotation of cam). At this pointthe clearance between the striker
and the switchsupport (5) should be 1/32" or less. This can
beadjusted by loosening the switch support mountingbolts (4) and
rotating the support.Interlock Switch Wipe
Refer to Figure 12. With the positive interlockin the reset, or
normal position the clearancebetween the interlock switch arm (2)
and the switchmounting plate (3) should be 1/32" or less. Thiscan
be adjusted by bending the switch arm.Driving Pawl Adjustment
to its maximum travel. Now check the clearancebetween the
ratchet tooth and the latching pawl. Theclearance should be
approximately equal for boththe driving and latching pawls and not
less than.015" in either case.
If adjustment is required for either pawl thesprings must first
be fully charged and blocked.Loosen seven motor support bolts (2)
Figure 1and move entire motor assembly to the rear ifthe clearance
is under the minimum at the latchingpawls, and to the front if the
clearance is underthe minimum at the driving pawl. Move the
motorassembly approximately twice the dimensional in-crease
required at the pawl. Be certain themotor assembly is moved
straight forward orrearward and tighten the one bolt on the right
sideof the mounting frame first to assure properalignment. After
tightening the remaining boltsthe springs should be released and
the clearanceagain checked as described above.
The driving pawl (8) mustRefer to Figure 4.advance the ratchet
wheel (6) sufficiently on eachstroke to allow the latching pawls
(2) to fallinto the ratchet teeth. This should be checked withthe
closing spring load against the driving members.With the mechanism
unblocked, hand charge theclosing springs with the manual charging
wrenchuntil they are slightly more than half charged.Slowly rotate
the charging wrench until the drivingpawl has traveled through its
return stroke andcheck the maximum clearance between the pawland
the ratchet tooth. Rotate the charging wrenchuntil the driving pawl
has advanced the ratchet tooth
AUXILIARY DEVICES
Latch Checking SwitchaRefer to Figure 13. Charge the closing
springs
sufficiently to reset the mechanism linkage. Rotatethe trip
latch (4) by pressing the manual trip lever
mm
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Magne-blast Circuit Breaker GEI-88761
i
k2
3
mFigure 14. (8034464) Plunger Interlock
1. Plunger BoltWasherBreaker Lifting Rail
Figure 13. (0114C5320) Latch Checking SwitchSwitch Support
2. Latch Checking Switch3. Switch Arm
Trip Latch5. Reset Pin Stop6. Latch Roller7. Latch Roller Link8.
Latch Roller Pin
1.
4.II
to open the latch checking switch (2). Allow thetrip latch to
reset slowly and determine the pointat which the contacts are made
by using a circuitcontinuity tester (light indicator, bell set,
etc).The contacts of the latch checking switch shouldjust make when
the g(4) and the stop pin (5)link (7) is 1/16".1/64" between the
switch arm (3) and the switchsupport (1). To obtain adjustment of
the latch check-
switch, bend the latch checking switch arm
Figure 15. (8034471) Driving Elements1. Mounting Bolts
Manual Close ButtonEccentricRetaining Ring
5. Hex Charging Stud6. Driving Link
Motor SupportRetaining Ring
9. Motor10. Fuse
2.ap between the trip latchlocated on the latch roller
There should be a minimum of
3.4.7.8.mg
(3).Plunger Interlock
§,,,Refer to Figure 14. With the breaker in the
closed position, the vertical distance ”A” from thetop of the
plunger bolt (1) to the bottom of thebreaker lifting rail (3)
should be 16-19/32” to16-23/32”. To change this adjustment, add
orremove washers (2).
Inspection and Test
1. For ease in reviewing the adjustments, thefollowing are
recapitulated:
Primary contact wipe: 1/4” to 5/16”.Arcing contact wipe: 5/16”
or greatergap at primary contacts.Primary contact gap: 3-5/8” to
3-15/167Trip latch wipe: 3/16” to 1/4” with triplatch resting
against stop pin.Trip armature travel 7/32” to 9/32”.Release latch
wipe: 3/16” to 1/4”.Release latch monitoring switch: Max-imum
clearance 1/32”.
a.b.
Auxiliary Fusesc.
Refer to Figure 15. On breakers with a ”C” or”K” suffix, a set
of protectingfuses (10) are mounted
igj^ on the front of the breaker. These fuses are theprimary
protective devices for the closing controlcircuit on those breakers
that are used in metal-clad units designed for
solenoidoperatedbreakers*
d.e.I f.g.
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GEI-88761 Magne-blast Circuit Breakertangent to the lower
surface of the probes on theupper runner. Proper servicing and
lubricationof the breaker and its operating mechanism
shouldmaintain these speeds and no adjustment is provided.Control
Power Check
Motor and relay switch:clearance 1/32".Interlock switch: maximum
clearancel/32".Driving and Latching Pawl: minimumclearance to
ratchet teeth .015".Latch checking switch contacts makewhen the gap
between the trip latchand the stop pin is 1/16".Plunger interlock:
16-19/32" to 16-23/32".
Check all nuts, washers, bolts, cotter pins,and terminal
connections for tightness.Inspect all wiring to make sure that
nodamage has resulted during installation,and test for possible
grounds or shortcircuits.
maximumh.i.j*
k.After the breaker has been operated several
times with the manual charging wrench and themechanism
adjustments are checked as described,the operating voltages should
be checked at therelease coil, trip coil, and motor
terminals.Control Power for electrical operation of thebreaker may
be from either an alternating ordirect current source. The
operating ranges forthe closing and tripping voltages as given on
thebreaker nameplate, are as follows:
1.
2.I
3.
NominalVoltage
ClosingRange
TrippingRange! 4. See that all bearing surfaces of the
mech-anism have been lubricated. Refer to the
section on LUBRICATION. (Page 16 andFigure 17).
5. Operate the breaker slowly with the manualcharging wrench and
note that there is noexcessive binding or friction and that
thebreaker can be moved to thefully opened andfully closed
positions.
6. See that any place where the surface of thepaint has been
damaged is repainted immed-iately.
7. Check the trip coil plunger and the releasecoil plunger to
see that they move freely.
Opening and Closing Speeds
I
24v d-c48v d-c
llOv d-c125v d-c220v d-c250v d-c115v a-c230v a-c
14 30v d-c60v d-c
125v d-c140v d-c250v d-c280v d-c125v a-c250v a-c
: 34 2850v d-c115v d-c130v d-c230v d-c260v d-c125v a-c250v
a-c
80 607090
160 120180 140
95 95190 190
If the closed circuit voltage at the terminalsof the coil or
motor does not fall in the specifiedrange, check the voltage at the
source of power andline drop between the power source and
breaker.
When two or more breakers operating from thesame control power
source are required to closesimultaneously, the closed circuit
voltage at theclosing coil or motor of each breaker must fallwithin
the specified limits.
W
The closing speed of the arcing contact of thebreaker should be
a minimum of 11feet per second.This represents the average speed of
the movablearcing contact from a point 3" before the tip istangent
to the lower surface of the probes on theupper arc runner to the
tangent position. Electrical closing or opening is accomplished
by
energizing the closing or trip coil circuit. Controlswitches are
provided for this purpose on themetal-clad unit. It is also
possible to trip or closethe breaker manually by pressing the
manual triplever (8) Figure 5 or the manual close button (9).
The opening speed of the arcing contact shouldbe a minimum of 12
feet per second. This repre-sents the average speed over 3" from
the pointwhen the tip on the movable arcing contact is
GENERAL MAINTENANCEGeneral
every 2000 operations, or once per year, whichevercomes first.
If the breaker is also required tointerrupt fault currents during
this period of timeadditional maintenance and replacement of
partsmay be necessary.
Safe and dependable service from electrical ap-paratus and power
systems is contingent upon re-liable performance of power circuit
breakers. Toobtain maximum reliability the breaker should
beinspected and maintained on a regular schedule.The breakers are
designed in accordance with ap-plicable standards which require
that they becapable of performing up to 5000 operations for1200
ampere breakers and 3000 operationsfor 2000ampere breakers
switching rated continuous cur-rent before any replacement of parts
should benecessary.breakers being serviced, or maintained, at
least
BEFORE ANY MAINTENANCE WORK IS PER-FORMED, MAKE CERTAIN THAT ALL
CONTROLCIRCUITS ARE DE-ENERGIZED AND THAT THEBREAKER IS REMOVED
FROM THE METAL-CLADUNIT.MECHANISM WHILE IN THE CLOSED
POSITIONUNLESS THE PROP AND TRIP LATCH HAVEBEEN SECURELY WIRED OR
BLOCKED TO PRE-
DO NOT WORK ON THE BREAKER OR
This requirement is based on the
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e-jMagne-blast Circuit Breaker GEI-8876
pieces (3 & 6) Figure 1-8 and the uppe:mounting support (10)
should be inspecte<for breaks in the insulation. If there
areholes or breaks in the insulation they shoulcbe repaired or the
part replaced.
VENT ACCIDENTAL TRIPPING. DO NOT WORKON THE BREAKER OR MECHANISM
WHILE THE
^SPRINGS ARE CHARGED UNLESS THEY ARESECURED IN THAT POSITION BY
THE MAIN-TENANCE SPRING BLOCKING DEVICE.tmPeriodic Inspection
The frequency of the inspection and maintenanceoperations
required should be determined by eachoperating company and will
depend on the applica-tion of the breakers and the operating
conditions.Factors which should be considered are: Import-ance to
overall plant or system operation; numberof operations and
magnitude of currents switched bybreaker; frequency of fault
interruptions; and theatmospheric conditions in which the breaker
nor-mally operates. Extreme conditions of dust,moisture, corrosive
gases etc., can indicate thatinspection and maintenance will be
required morefrequently than every 2000 operations. Very cleandry
operating conditions with low current switchingduty can justify a
longer period of time betweeninspections. Any time a breaker is
known tohave interrupted a fault at or near its rating itis
recommended that the breaker be inspected andnecessary maintenance
be performed as soon afterthe interruption as is practical. The
followinginstructions give the items that should be includedin an
inspection and general recommendations onthe maintenance of
breakers.
.•’•twMRr/aanifUHam
Interrupters
Since there are no movingparts, the interrupters^ of a
magne-blast breaker will normally require
little or no inspection unless there is evidenceof damage to the
arc chutes sides or contaminationin the throat area. If either of
these conditionsare present the interrupters should be removedfrom
the breaker and the following points noted:
1. The throat area of the interrupter shouldbe cleaned with
sandpaper (Do Not useemery cloth or other metallic abrasives).All
flat areas on either side of the movablearcing contact travel
should be sanded.Do not sand or otherwise attempt to cleanthe
ceramic fins of the arc chute sides.Heavily contaminated parts
should be re-placed.
2. Cracks which have formed in the fins of thearc chute are to
be expected in ceramicmaterials of this type when subjected tothe
severe heat of an arc. These cracksdo not interfere with the
operation of thedevice in any way and should be disregarded.
30 If the arc chute has suffered any mechanicalinjury due to
droppingor accidentalstriking,resulting in the actual breaking off
of fins,replacement will be necessary. Smallbroken corners on the
exhaust end of thearc chute sides will not interfere with
itsperformance and can be disregarded.
4. The plastisol flexible covering for the pole
m
Fig. 16 (8039584) Interrupter Removed ShowingAccessibility of
Arcing Contacts
1. Rear Bushing2. Upper Horizontal Barriers3. Supporting Bolt4.
Upper Interrupter Support5. Stationary Arcing Contacts6. Movable
Arcing Contact7. Mounting Bolts8. Arc Chute Brace9. Support
Bracket
10. Lower Supporting Bolt11. Lower Interrupter Support12.
Interrupter
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GEI-88761 Magne-blast Circuit Breaker,
Interrupter Removal and Replacement All other insulation parts
on the breaker shouldbe kept clean and dry. Smoke or dust
collectedbetween inspection periods should be wiped off,and if
dampness is apparent, heaters should be||J|installed in the metal
clad switchgear to insuredryness.
Refer to Figure 16. To remove the interrupterloosen the two
upper supporting bolts (3) and the onelower' support bolt (10)
using a standard 3/4"wrench. Raise the assembly approximately
3/8"and slide it toward the rear of the breaker.
To reassemble the interrupter to the breaker,rest the lower
interrupter support (11) on thesupport bracket (9). Slide the arc
chute forward,lifting it slightly to engage the supporting bolts
(3)in the slots of the upper interrupter support (4).On the "-6"
design check the spring baffle (11)Figure 22, to assure that it
closes the gap be-tween the upper insulation (7) Figure 19, andthe
back surface of the contact support (4) Figure22. On the "-8"
design check to assure that
!Insulation Test
SWhen insulation has been repaired or replaced,
or when breaker has been operating in adversemoisture
conditions, it is recommended that theinsulation be checked before
the breaker is placedback in service. A standard 60 hertz high
poten-tial test at 14,000 volts RMS for one minute willnormally
indicate whether the breaker is satis-factory for service. With the
breaker contacts inthe fully opened position, apply the test
potentialto each terminal of the breaker individually with allother
terminals and the breaker frame grounded.After high potential tests
are made on organic in-sulating materials, these materials should
beinspected for visible leakage current paths, andnecessary action
must be taken to repair or replaceinsulation that may have been
affected by moistureabsorption.
If the breaker secondary wiring is to be givena high-potential
test at 1500 volts, remove both ofthe motor leads from the terminal
board. Failureto disconnect the motor from the circuit may
causedamage to the winding insulation.Lubrication
!;
gjjtu
W .h
the upper insulation is properly positioned withinthe barrier
suspended from the stationary contactsupport (9) Figure 23.Tighten
the supporting bolts (3 and 10) Figure
16. These bolts serve as both the electrical andmechanical
connections between the bushings andthe arc runners within the
interrupter. Checkthat the movable arcing contact (6)tween the
probes on the upper arc runner (5)Figure 19 without
touching.Breaker Contacts
:
passes be-
By removing the box barrier the movable andstationary primary
contacts and the movable arcingcontacts can be inspected. The
stationary arcingcontacts can be inspected only after removing
theinterrupter. If the contacts are burned or pitted,they can be
made smooth with a fine file.
After completing inspection of the contacts,check the contact
adjustments as specified underADJUSTMENTS.
In order to maintain reliable operation, it isimportant that all
circuit breakers be properlylubricated at all times. Most of the
bearings androlling surfaces utilize a new type of dry
lubricationthat will require no maintenance and will last thelife
of the equipment. Only few bearings and sur-faces listed in the
chart, Figure 17, requirelubrication. These have been properly
lubricatedduring assembly at the factory, using the finestgrades of
lubricants available. However, even thefinest oils and greases have
a tendency to oxidizewith age, as evidence by hardening and
darkeningin color. Elimination of the hardened lubricantis
essential for the proper operation of circuitbreakers. Also
frequent operation of the breakercauses the lubricant to be forced
out from betweenthe bearing surfaces. A simple lubrication
willoften clear up minor disturbances which mightbe mistaken for
more serious trouble.
Mechanism
A careful inspection should be made to checkfor loose nuts or
bolts and broken retaining rings.All cam, roller, and latch
surfaces should beinspected for any evidence of damage or
excessivewear. Lubricate the mechanism as outlined below,then,
using the manual charging wrench, open andclose the breaker several
times to make certainthat the mechanism operates freely throughout
itsentire stroke. Check the mechanism adjustmentsas specified under
ADJUSTMENTS,control wiring for tightness of connections anddamaged
insulation.Bushings and Insulation
§lb
Check theA definite lubrication schedule should be set up
taking into consideration the frequency of operationof the
breaker and local conditions.
It is recommended that lubrication of the breakerand its
operating mechanism be a part of the per-iodic inspection and
maintenance program, with notmore than a two year period between
lubrications.It is also recommended that all circuit breakers
beoperated at regular intervals, at least once a year,to insure the
lubrication is in good condition andthe breaker is operable.
The surface of the bushings should be kept cleanand unmarred to
prevent moisture absorption.If the insulation surface should become
damaged,it should be sanded and cleaned, and should berefinished
with either clear varnish or clearresin. Allow to dry smooth and
hard.
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PF~
Magne-blast Circuit Breaker GEI-88761formed on the breaker at
the factory, and should beused when a general overhaul of the
breaker isnecessary.
General Electric Lubricants D50H15andD50H47are available in
l/41b collapsible tubes. It is sopackaged to insure cleanliness and
to preventoxidation.
The lubrication chart, Figure 17, is divided intotwo methods of
lubrication. The first method out-lines the maintenance lubrication
which should beperformed at the time of periodic maintenance,
andrequires no disassembly. The second method out-lines a
lubrication procedure similar to that per-
LUBRICATION ATMAINTENANCE
PERIODALTERNATE LUBRICATION(REQUIRES DISASSEMBLY)
PART
Sleeve Bearings - links, tripshaft, etc. (Teflon
coatedbearings)
No lubricationrequired
No lubrication required
Sleeve Bearings - main crankshaft, driving pawl lever.(Bronze or
cast iron)
Light applica-tion of machineoil SAE 20 orSAE 30.
Remove bearings or links,clean per instructionsand apply D50H15
lubri-cant liberally.
Contact Arm Hinge AssemblyCup bearingLoose rings between
bushingand contact arm.
No lubricationrequired. Wipe clean and applyD50H47.
Roller and Needle Bearings Light applica-tion of machineoil SAE
20 orSAE 30.
Clean per instructionsand repack with D50H15lubricant.
Ground surfaces such as cams,ratchet teeth, etc.(Surfaces coated
with M0S2)
No lubricationrequired. No lubrication required.
Ground surfaces such aslatches, rollers, prop, etc. Wipe clean
and applyD50H15 lubricant.Wipe clean andapply D50H15
lubricant.Silver plated contacts andprimary disconnect studs.
Wipe clean andapply D50H47. Wipe clean and applyD50H47.Booster
Cylinder Do not lubricate Do not lubricateArcing Contacts Do not
lubricate Do not lubricate
g
Figure 17. Lubrication Chart
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'1,1 :
GEI-88761 Magne-blast Circuit Breakerthe alcohol in a well
ventilated room; excessiveexposure to the fumes is sometimes
unpleasantto personnel,. Washing the bearings in the lightoil,
draining and repacking with lubricant D50H15should follow
immediately.
Bearings that arepressed into theframeor other ,members such as
the motor support (7) Figure 15,should not be removed. After
removing the shaftand inner race the bearing can be cleaned
satis-factorily with petroleum solvent or a similarcleaner and a
stiff brush. Follow the procedureoutlined above using a light
machine oil and G-Elubricant D50H15 before reassembling the
innerrace and shaft.
METHOD OF CLEANINGBEARINGS
Whenever cleaning of bearings is required, asindicated in the
lubrication chart, the followingprocedures are recommended.Sleeve
Bearings
The sleeve bearings used throughout the linkageutilize Teflon
surfaces and do not require lu-brication. After a number of
operations, the sur-face will acquire a thin black film. Do not
remov'ethis film unless there is evidence of outside con-taminates,
such as dry or hardened grease. Ifcontaminants are present they
should be removedby immersing the link and bearing in clean
petro-leum solvent, or similar cleaner, and using astiff brush. Do
not remove the bearings from thelinks. DO NOT USE CARBON
TETRACHLORIDE.
The hinge of the primary contact arm (24)Figure 8, should be
disassembled, cleaned, andlubricated with G-E D50H47 lubricant at
generaloverhaul periods.
The main shaft bearings (24) Figure 7 and thebearings in driving
pawl lever (10) Figure 4,should be removed, cleaned, and lubricated
withG-E D50H15 lubricant at general overhaul periods.Roller and
Needle Bearings
Rolling Surfaces
A number of rolling and rubbing surfaces in themechanism have
been lubricated with a baked-ondry, molybdenum disulfide coating.
This lubri-cation, which can be recognized by its dark, almostblack
color (e.g. Face of switch cam (5) Figure 2)requires no maintenance
and should last the lifeof the breaker.
Other rolling or rubbing surfaces that are notlubricated with
molybdenum disulfide should havethe dried, dirty grease removed and
a thin filmof fresh lubricant D50H15 applied.
MAINTENANCEMagne-blast breakers used for switching arc
furnaces or capacitors will require more frequentand more
detailed inspection and maintenancebecause of the repetitive nature
of the applications.The following schedule is recommended for
suchbreakers:
A. Every 500 Operations, or Every Six Months-Whichever Comes
First:
Refer to Figure 7. The. cam follower bearings6), latch roller
bearing (9), and cam shaft bearings25) should be removed from the
mechanism and
the inner race disassembled. They should then beplaced in a
container of clean petroleum solventor similar
cleaner.TETRACHLORIDE .has become badly oxidized, it may be
necessary touse alcohol (type used for thinning shellac) toremove
it. Ordinarily, by agitating the bearings inthe cleaning solution,
and using a stiff brush toremove the solid particles, the bearings
can besatisfactorily cleaned. Do not handle the bearingswith bare
hands as deposits from the skin onto thebearings are inductive to
corrosion. If the bear-ings are touched, the contamination can be
removedby washing in alcohol.. After the bearings have
beenthoroughly cleaned, spin them in clean new lightmachine oil
until the cleaner or solvent is entirelyremoved. Allow this oil to
drain off and then repackthem immediately with G-E
lubricantD50H15beingsure all metal parts are greased. The inner
racesshould then be assembled.
Etaif
DO NOT USE CARBONIf the grease in the bearings
Il
Remove the box barriers.1.'i
Wipe all insulating parts clean of smokedeposit and dust with a
clean dry cloth,including the bushings, and the insideof the box
barriers.
2.I
3. All flat parts in the throat area of theinterrupters should
be thoroughly clean-ed by using sandpaper. This cleaningshould be
performed any time the inter-rupter is removed. The fins on the
arcchute sides should not be cleaned.Whenever the interrupter is
removed,loose dust and dirt should be blownout before replacing arc
chutes. Throatinsulation which is heavily contaminatedshould be
replaced.
B. Every 2000 Operations, or EverySix MonthsWhichever Comes
First:
1 If it becomes necessary to clean thebearings in alcohol
(shellac thinner), be surethe alcohol is perfectly clean, and do
not allow thebearings to remain in the alcohol more than a
few7hours. If it is desirable to leave the bearings inthe alcohol
for a longer time, an inhibited alcoholsuch as is used for
anti-freeze should be used.Even then the bearings should be
removedfrom thealcohol within twenty-four hours,against the toxic
effects of the alcohol must beexercised by wearing rubber gloves
and by using
NOTE:
I
In addition to the servicing done each500 operations, the
following inspectionshould be made and work done whenrequired.
1 .Precautions
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Magne-blast Circuit Breaker GEI-88761positions. Its electrical
operationshould then be checked using either thetest cabinet or the
test couplers.
C. After Every 10,000 Operations:1. In addition to the servicing
done each
2000 operations, the interrupters shouldbe removed from the
breaker and dis-assembled to permit a detailed inspec-tion of
insulation, blow-out coils, arcrunners and assemblies which
canbecome contaminated by arc products.
2. The blow-out coils should be carefullyexamined and if the
insulation has beencracked, shrunk or eroded from arcaction and
heat so that the turns of thecoils are not fully insulated from
eachother, the coils should be replaced. Allconnections should be
checked fortightness.
3. The arc runners should be inspectedand replaced when any part
of theirarea has been reduced to 25% of theoriginal metal thickness
as a resultof arc erosion.
2. Primary Contacts (3 and 10 Figure 23).Inspect the condition
of the stationarycontact fingers and movable contactblocks. Badly
pittedor burned contactsshould be replaced. (Note: Burnedprimary
contacts indicate the probableneed for arcing contact
replacement*)If the contact surfaces are only rough-ened or galled,
they should be smoothedwith crocus cloth or draw filed.
Aftercontact dressing the primary contactsshould be greased lightly
with D50H47.
3. Arcing Contacts (6 and 27 Figure 8).When the arcing contact
wipe is lessthan the minimum specified under AD-JUSTMENTS, the
contacts should bereplaced.inspected for uneven wear and/or dam-age
using a mirror to inspect thestationary contacts. Normally it
willnot be necessary to remove the inter-rupters for this 2000
operation ser-vicing unless inadequate wipe or con-tact condition
indicate a need for re-placement. If the interrupters are re-moved,
the contact braids, and otherparts subject to arcing shouldbe
check-ed for possible cleaningor replacement.Do not grease the
arcing contacts underany circumstances.
The contacts should be
4. Check the stationary arc contacts toassure that the arcing
contacts are ingood condition and that their connectionsare
tight.Insulating material that is carbonizedand cannot be
satisfactorily cleanedshould be replaced.Any parts damaged or
severely burnedand/or eroded from arc action shouldbe
replaced.NOTE: Fine cracks may develop in thefins of the arc chute
sides. This is tobe expected with ceramic materialswhen subjected
to the high heat of anarc and may be disregarded unlessthey are
long and present a possibilityof fin sections breaking completely
off.Small broken corners on the exhaustend of the arc chute will
not interferewith its performance and can alsobe disregarded.
4. Check the breaker and mechanism ad-justments as summarized
under IN-SPECTION AND TEST. The necessaryreadjustments should be
made as de-scribed under ADJUSTMENTS.
5.
6.5. The breaker and operating mechanismshould be carefully
inspected for loosenuts, bolts, retaining rings, etc., allcam,
latch and roller surfaces shouldbe inspected for damage or
excessivewear. The buffer blocks and theirretainers on the bottom
of the stationarycontact support should be inspectedforpossible
need of replacement.
6. The contacts of the control relay (17)Figure 6, should be
inspected for wearand cleaned if necessary.
7. Lubricate the breaker operating mech-anism in accordance with
instructionsunder LUBRICATION, page 16 and thelubrication chart
Figure 17.
8. Inspect all wiring for tightness of con-nections and possible
damage of in-sulation.
7. The cup bearing and the contact ringat the hinge point of the
contact bladeshould be disassembled, inspected,cleaned, and
relubricated with G-Econtact lubricant D50H47. The contactring
should be inspected for wear andreplaced when reduced in thickness
toless than 1/32". When reassemblingthe cup bearing, be sure the
cotterpin is properly assembled in the castlenut on the hinge pin
(7) Figure 23.This assures proper contact pressureat the hinge.
9. After the breaker has been serviced,it should be operated
manually to besure there is no binding or frictionand that the
breaker contacts can moveto the fully opened and fully closed
191
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J
GEI-88761 Magne-blast Circuit BreakerD. Every 20,000 operations
or Approximately
Every Five Years - Whichever comesfirst:1. The breaker should be
given a general
inspection and overhaul as required.All excessively worn parts
in both themechanism and breaker should be re-placed. Such wear
will usually beindicated when the breaker cannot beadjusted to
indicated tolerances. Thisoverhaul and inspection is more detail-ed
and will require disassembly of mech-anism and breaker operating
parts.
2. All roller and needle bearings in theoperating mechanism
should be dis-assembled, cleaned, and repacked withG. E. lubricant
D50H15 as describedunder LUBRICATION.
2. Remove the side brace (5), and pole pieces(3 & 6).
3. To remove the upper interrupter support(10) remove the
assembly bolt (1), andthe bolted connection (2) Figure 20 be-tween
the upper interrupter support andthe blowout coil.
4. Remove the assembly bolt (16) Figure 18to remove the lower
brace (8).
5. Remove the lower .interrupter support (14)by removing the
assembly bolts (15) and theconnection nut (8) Figure 20.
6. At this point, the side shields (5) Figure20, and the arc
runner assemblies (4 & 6)can be removed.
i
3. The stationary primary contactfingers(3) Figure 23, should be
disassembledand the silver-plated pivot area of thecontact and
contact support cleaned
lubricated with G-E lubricant7. Further disassembly of both the
upper and
lower arc runner assemblies can be doneby removing the various
screws and assem-bly bolts (not illustrated) as shown inFigure
19.The arc chute sides (6) Figure 19, canalso be separated for
inspection afterremoving assembly bolts (2 & 4) Figure
andD50H47.
8.4. The breaker and operating mechanismshould be serviced as
described forevery 2,000 operations and properlyadjusted before
being put back intoservice. 18.
Reassemble the interrupter in the reverse order.The following
items should be noted during re-assembly:REPAIR AND REPLACEMENT1
US'
l This section covers the proper method ofremoving and replacing
those parts of the breakersubject to damage and wear that may
require repairor replacement at the installation. IMPORTANT:UPON
COMPLETION OF ANY REPAIR WORK, ALLBREAKER AND MECHANISM ADJUSTMENTS
MUSTBE CHECKED.STALLATION, paying particular attention to
AD-JUSTMENTS and FINAL INSPECTION.
The fins of the arc chute sides should beequally spaced and
aligned before boltingtogether. The front edge (along the runner)of
the two arc chute sides should be paralleland in line.
1.
2. The gap between the fins at the rear of thearc chute sides
measured at least1" infromthe back end of the arc chute (See
Figure21) should be 1/64" to 3/32".
3. Check to insure that electrical connectionsto the blowout
coils are tight.
4. When reassembling the arc runner as-semblies, check that the
spacers are cor-rectly installed.
5. Before bolting the upper supports in place,make certain that
the upper arc runnerassembly is tight against the arc chuteside so
that the gap between the throatinsulation (7) Figure 19, and the
arcchute sides (6) is a minimum.
6. Make certain that the electrical connections(2 & 8)
Figure 20 are tight.
Reassemble the arc chute on the breaker asdescribed under
INTERRUPTER REMOVAL ANDREPLACEMENT, page 16.
Refer to the section on IN-
ARC CHUTE (To inspect or replace blow-out coilsand arc
runners):
With the breaker open and the closing springsin the blocked
position, remove the box barrier(7) Figure 8. The interrupter can
now be re-moved as described under INTERRUPTER RE-MOVAL AND
REPLACEMENT page 16.
To disassemble the interrupter after it has beenremoved from the
breaker, proceed as follows:
NOTE: When disassembling the arc chute andits components some
small washers, spacers,etc., will be found that cannot be
identified inthese instructions. Care should be taken tocollect and
identify these items so they can bereassembled correctly.
1. Remove the caps and assembly bolts (7,9, 11, & 13) Figure
18.
s
1
I m1S .!!i
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HP""
Magne-blast Circuit Breaker GEI-88761
-910
11
12Iii ?./>m Sw MOA: Ml-W-12 ..13
& ;.'im a 13 iV §p|! '35 mk 1414 >y»“ \:: : : •?15 © HJ j
,- ' ' [16 •a® m ®ft: srr. 15
5
IFigure 19. (8039603) Interrupter Assembly
with Side RemovedFigure 18. (8039601) Interrupter Assembly
1. Assembly Bolts and Bushing2. Assembly Bolts3. Upper Pole
Piece4. Assembly Bolt5. Side Brace6. Lower Pole Piece7. Assembly
Bolt8. Lower Brace9. Assembly Bolt
10. Upper Interrupter Support11. Insulating Cap12. Side
Shield13. Assembly Bolt14. Lower Interrupter Support15. Assembly
Bolts16. Assembly Bolts
31. Upper Arc Runner Spacer2. Upper Arc Runner Assembly3.
Blowout Core4. Blowout Coil5. Upper Arc Runner6. Arc Chute Side7.
Throat Insulation8. Lower Shield9. Lower Arc Runner
10. Blowout Coil11. Blowout Core12. Lower Insulation13. Lower
Arc Runner Assembly14. Lower Coil Connection15. Lower Arc Runner
Spacers
sI
*i
*
21
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'1
GEI-88761 Magne-blast Circuit BreakerCONTACTS
Open the breaker and remove the box barrierand interrupters as
previously described. Toremove the contacts, proceed as
follows:
A. Stationary Arcing Contacts (10) Figure 22.1. Disconnect the
contact braids (7) from
the contact fingers by removing twobolts and locking plates
(8).
2. Grasp the lower end of the contactfingers with pliers and
pull contactassembly downward to remove fromstud assembly.
3. To disassemble braids from stud plateremove one bolt (5).
4. To disassemble stud platefrom contactsupport, remove two
bolts (6).
5. Reassemble in the reverse order, makesure locking plates are
properly re-assembled with bolts (8).
B. Movable Arcing Contact (14) Figure 23.1. Remove the assembly
bolts (12) making
note of quantity and location of shimsand spacers used between
contacts andcontact arms.
2. Reassemble in reverse order, re-usingthe shims and
spacers.
3. Close the breaker slowly to checkthat the movable arcing
contact isapproximately centered on the station-ary arcing contact
and that it doesnot rub on either side of the throatbarrier
(9).NOTE: Whenever it is found necessaryto replace arcing contacts
on any poleof a breaker it is recommended thatboth the stationary
and movable con-tacts on that pole be replaced at thesame time.
WJW
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Figure 20. (8039604) Interrupter Assembly1. Upper Mounting
Support2. Connection Bolt
Insulation Plate4. Upper Arc Runner Assembly5. Side Shield6.
Lower Arc Runner Assembly7. Lower Coil Connection
Connection Nut9. Lower Mounting Support
i 3.i
8.
j
C. Stationary Primary Contacts (9) Figure 24.1. Compress the
contact spring (6) by
use of the spring compressor.2. Remove spring and spring guide
(1).3. Raise the contact finger to clear the
primary contact stop plate (8) and liftthe finger out of contact
support (7).Remove one contact finger at a time.
To replace theStationary Primary Contacts:
IS
a1. Apply a thin coating of D50H47 grease
the hinged edge of the finger (9) thenplace it on the contact
support (7) so
i onFigure 21. (8G29373) Arc Chute Fin Spacing
22;
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W "
Magne -blast Circuit Breaker GEI-88761
2
3
4
5-689
1011
12is
Fig. 226 (8039586) "-8" DesignFig. 22A (8025170) "-6" & "-7"
DesignsFigure 22. Rear Bushing Assembly
8. Connection Bolt9. Stud for Mounting Arcing Fingers
10. Stationary Arcing Contact Assembly11. Spring Baffle12.
Insulating Plate13. Throat Baffle
I 1. Rear Bushing2. Guide and Support for Interrupter3. Bolts
for Contact Support4. Contact Support5. Bolt for Flexible Braid6.
Mounting Bolt7. Flexible Braid
sI
!s;
I
that it is retained by stop plate (8).Open spring compressor (3)
and as-semble spring guide, spring and springcompressor (Figure
24A).Turn nut (2) in clockwise direction tocompress contact spring
(Figure 24B).Hold spring firmly in yoke on spring-compressor to
prevent spring fromslipping out of the compressor.Place washer (not
shown) on guide ontop of spring, place top of guide intohole in
spring retainer (4) andround end of spring guide in cutout
inprimary finger (Figure 24C).Hold spring assembly firmly in
placeand remove spring compressor.
1 D. Movable Primary Contacts (10) Figure 23,To replace the
movable primary con-tacts on a 1200 ampere breaker proceed as
follows:
i2.
3. 1. Disassemble nuts from assembly bolts(11) and remove the
movable primarycontacts (10).Reassemble in reverse order.2.
4. To replace the movable primary con-tacts on a 2000 ampere
breaker it is firstnecessary to disassemble the movable arc-ing
contacts, then proceed as follows:1. Disassemble operating rod pin
(4),first
noting quantity and location of washersin the assemble.
the
5.S
23
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GEI-88761 Magne-blast Circuit BreakerE. Contact Arm Assembly (8,
10, 12, 14,
Figure 23).1. Remove connection bar (15).
; ;5i
2. Disassemble hinge pin (7), cup bearing(4 ) noting(6), and
operating rod pm
quantity and location of any washersand spacers used in
assemblies.The contact arm assembly including thepiston assembly
(13) can now be re-moved.
3.
4. When reassembling, first insert pistontube assembly (13.)
into the boostercylinder and reassemble the cup bear-ing, making
sure the silvered contactwashers between the bushing and con-tact
arms (both sides) are in place.
5. Reassemble operating rod pin (4) andconnection bar (15).
F. After disassembly and reassembly of anycontacts, check all
contact adjustments asdescribed under ADJUSTMENTS.
Sil;!»
BUSHINGS! DO NOT REMOVE ALL SIX
The bushings have beenIMPORTANT:
BUSHINGS AT ONCE,carefully aligned with the breaker frame,
duringassembly at the factory, and it is important thatthis
alignment be maintained to insure interchange-ability of the
breakers in the metal-clad units. Itis, therefore, recommended that
the bushings beremoved and reassembled one at a time. Also,before
removing any one bushing, measure the dis-tance from that
particular bushing to adjacentbushings in both directions, so that
it may bereinstalled in the same location.
Figure 23. (8039588) Contact Assembly1. Front Bushing2. Contact
Springs3. Stationary Primary Contacts4. Operating Rod Pin5.
Buffer6. Cup Bearing7. Hinge Pin8. Contact Arm9. Throat Barrier
10. Movable Primary Contacts11. Assembly Bolts12. Assembly
Bolts13. Piston Assembly14. Movable Arcing Contact15. Connection
Bar
1 i
S3 However, it is possible to remove and re-assemble three
bushings at one time. If this ispreferred, alignment of the
bushings may beaccomplished by placing the breaker in a
de-energized spare metal-clad unit before tighteningthe bushing
mounting bolts0 This must be donebefore the interrupters are
reinstalled.To replace the bushing, proceed as follows:Rear
Bushing
Isj
1
I
II
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Pry contact arms (8) apart enough todisengage pivot pins of
piston assembly(13) allowing piston to drop down intoits booster
cylinder.Rotate the two parts of the contact armassembly away from
each other so as-sembly bolts (11) are accessible andmovable
primary contacts (10) can beremoved.
1. Open the breaker and remove the boxbarrier and interrupters
as already de-scribed.
2.l iS i
Remove the upper and lower horizontalbarriers (18 and 20) Figure
8.Remove the four bolts at the mountingflange of the rear bushing
being removedand lower the bushing assembly.NOTE: Shims may be
found between thebreaker mounting plate and the bushing
2.13o
l 3.I
4. Reassemble in reverse order.
24
BSS3S358
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Magne-blast Circuit Breaker GEI-88761
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Figure 24A (8034466) Figure 24B (8034465)
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Figure 24C (8034469) Figure 24D (8034468)Figure 24. Method of
Installing Primary Contact
Springs Using a Spring Compressor
6. Spring7. Contact Support8. Stop Plate9. Stationary
Primary
Finger
1. Spring Guide2. Compressor Nut3. Spring Compressor4. Spring
Retainer5. Assembly Bolts
25
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m ‘^=^i
GEI-88761 Magne-blast Circuit Breakermoynting flange on some, or
all bolts.These shims are for squaring up the bushingand may be
required when new bushings areassembled.Referring to Figure 24,
disassemble theprimary contact springs (6) as
previouslydescribed.Disassemble the spring retainer (4) byremoving
mounting bolts (5).Referring to Figure 22, disassemble thecontact
support (4) and interrupter mountingbracket (2) removing two bolts
(3).Reassemble in the reverse order. Theinterrupter mounting
bracket (2) is notsymmetrical and must be assembled cor-rectly to
orient the interrupter properlyon the breaker. The longest
projection ofthe bracket should be toward the lower endof the
bushing.
MOTOR, RELAY AND LIGHT SWITCHES
Two or three switches (7) Figure 6, are mountedin tandem as
required by the application.
Remove the opening spring per instructionsbelow.Remove (2)
mounting bolts (4) from switchbracket (5).Remove the (2 ) mounting
screws of the lowerswitch.Remove the (2) mounting screws of the
centerswitch.Remove the (2) mounting screws of the upperswitch.
4. 1.2.
5.3.
6.403
7. 5.Disconnect the lead wires of switch to bereplaced.6.
7. Reassemble in the reverse order and checkswitch adjustment as
explained under AD-JUSTMENTS.Front Bushing
Open the breaker and remove the boxbarrier and interrupters as
already de-scribed.Remove the upper and lower horizontalbarriers
(18 and 20) Figure 8.Remove the connection bar (15) Figure23, cup
bearing (6) and hinge pin (7).Remove the four bolts at the
mountingflange of the front bushing being removed,and lower the
bushing. (See note underrear bushings concerning use of shims.)When
reassembling, first mount the bushingand assemble the cup
bearing(6),contact arm(8), and replace pin (7) being sure
thesilvered contact washers between the bush-ing and contact arms
are in place. Thecontact surfaces at the hinge point of thecontact
blade and bushing should have a thincoating of D50H47 grease.Check
all contact adjustments as outlinedunder ADJUSTMENTS.
1. TRIP SHAFT AND LATCH (See Figure 11)Remove spring discharge
crank (5), manual
(13) and if furnished, the latch1.2. trip leverchecking switch
operating arm (8) Figure12 from the trip shaft.
3.1 2. Disengage trip latch spring (4) Figure 11.
3. Remove three (3) cotter pinsfrom trip shaft.4„ Remove trip
arm screw (12) and trip latch
set screw (10).5. Place a block between the trip latch (11)
and the left side of the mechanism frame.Drive the trip shaft to
the left until thelatch is free of the key, then remove the
key.
6. Check for and remove any burrs raisedaround the keyway on the
shaft to avoiddamaging the trip shaft bearings.
7. Shaft, latch, etc., may now be removed bydriving it to the
left. Note quantity andlocation of washers used as spacers in
theassembly.
8. Reassemble parts in reverse order. Be suretrip latch is
aligned in center of trip latchroller and that the latch spring is
properlyinstalled. Check latch adjustment as de-scribed under
ADJUSTMENTS.
TRIP LATCH ROLLER BEARING
4.
5.i
6.
INTERLOCK SWITCH
To remove the interlock switch (4) Figure 12,remove the two
mounting screws and disconnectthe lead wires. Reassemble in the
reverse orderand check the switch adjustments as explainedunder
ADJUSTMENTS.LATCH CHECKING SWITCH
1. Remove (2) cotter pins at ends of trip latchroller shaft (8)
Figure 13.
2. Partially remove shaft out right side offrame until latch
roller (6) is free.
To remove the latch checking switch (7) Figure12, (when
furnished), remove the two mountingscrews and disconnect the lead
wires. Reassemblein the reverse order and check the switch
adjust-ments as explained under ADJUSTMENTS.
a1 1
26
www.nationalswitchgear.comCourtesy of NationalSwitchgear.com
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Magne-blast Circuit Breaker GEI-887613. Reassemble in reverse
order with proper
spacing of washers. Be sure latch rollerrotates freely.CLOSING
LATCH
as far as it will go. Slide the shaft to theleft until key is
fully exposed. Remove keyand check shaft for burrs.
5. Remove shaft out left side of frame.1. Remove cotter pins at
both ends of closing
latch shaft (9) Figure 6.Remove spring and paddle (12).Remove
set screws from latch (8).Move shaft (9) to left (away from frame)
bytapping lightly on the inside end of shaft.Rotate shpft and
continue tapping until shaftis free. Shaft will push outside needle
bear-ing from housing.Reassemble in reverse order putting
bearinginto frame last. Use a small piece of tubingor pipe when
inserting bearing to assureproper alignment.Check closing latch
adjustments as de-scribed under ADJUSTMENTS.
6. Reassemble in reverse order using thecorrect number of
washers and spacers toproperly locate the parts.
7. Rotate the mechanism through a closingoperation using the
manual charging wrench.Check the location of the cam follower
(6)Figure 7, on the cam (16). If necessary,move the cam to correct
the alignment.Complete the closing operation and check thelocation
of the prop pin (13) on the prop (14).It should be approximately
centered.
2.3.4.
5. TRIP COILTo replace the potential trip coil (8) Figure
11,proceed as follows :1. With the breaker in the open position,
removethe two mounting bolts (9).
Remove trip coil support (7) and spacers.
6.MOTOR SUPPORT 2.
1. To remove motor support (7) Figure 15.first remove the
closing latch spring (12)Figure 6.Remove the retaining ring (4)
Figure 15,and driving link (6).Remove motor leads from the
terminalboard.Remove six 3/8" bolts (1) Figure 15, onbottom and one
3/8" bolt on the right side(not shown).Remove four mounting bolts
from motor(not shown).Remove the retaining ring (8) from
theeccentric (3).Reassemble all parts of the motor supportin the
reverse order and re-align it properlyas described under DRIVING
PAWL AD-JUSTMENTS.
3. Cut wires at the butt connectors and removecoil.4. When
replacing the coil be sure to assemblethe correct fiber spacers at
the ends beforebolting support (7).
Adjust coil location to allow approximately1/4" of armature
travel before latch startsto move.Butt connect wires and check
operation ofsolenoid electrically and mechanically.
SPRING RELEASE COIL
2.I
3. 5.4.
6.,
5.To remove the spring release coil (15) Figure6, proceed as
follows:
Block the closing springs as described inINSTALLATION.
6.:
1.7.2. Remove the left hand closing spring asdescribed in
CLOSING SPRINGS below.
CAM 3. Remove two mounting bolts (11), coil support(16), and
spacers.Cut wires at the butt connectors and removecoil.Replace the
coil and the correct number offiber spacers before bolting
support.Butt connect wires and check that the arm-ature is not
binding. Check coil forelectrical operation.
1. Remove 2 set screws from ratchet wheel(6) Fishaft
Remove 2 set screws from switch cam (5)Figure 2 and remove cam
from the mainshaft.Remove prop reset spring (4) Fig. 5.Remove 2 set
screws from cam (16) Figure7, and move cam to the right on the
shaft
re 4 and remove wheel from main.gui(5). 4.2,
5.6.3.
4.
27
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. _ v. •.. yerrtr. ». y.
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Magne-blast Circuit Breaker GEI-88761RECOMMENDED RENEWAL PARTS
FOR
TYPE ML-13 STORED ENERGY MECHANISMUSED FOR AM-4.16-250-6 (*), -7
(*), & -8 (*), 1200 & 2000 AMPERE
( * SUFFIX LETTERS - H, C, K, N, R )
i
Fig. Ref. No. Catalog No.DescriptionNo. No. Req'd.5 10 1 Spring
Charging Motor - **
48 V-DC110 & 125 V-DC & 115 V-AC, 60 Hz220 & 250
V-DC & 230 V-AC, 60
Hz0105C9393P0010105C9393P0020105C9393P003
Relay - **,48 V-DC110 & 125 V-DC220 & 250 V-DC115 V-AC,
60 Hz230 V-AC, 60 Hz
176 1
0137A7575P0040137A7575P0010108B1978G0010137A7575P0050137A7575P002
3 Potential Trip Coil - **110 & 125 V-DC220 V-DC250 V-DC115
V-AC, 60 Hz230 V-AC, 60 Hz24 V-DC48 V-DC
15006174582G001006174582G015006174582G002006174582G013006174582G032006275070G001006275070G002
Spring Release Coil - **110 & 125 V-DC220 V-DC250 V-DC115
V-AC, 60 Hz230 V-AC, 60 Hz48 V-DC
16 15
006174582G001006174582G015006174582G002006174582G010006174582G014006275070G002
0456A0866P0050456A0866P006
Switch, Normally OpenSwitch, Normally ClosedAuxiliary
SwitchClosing Latch SpringProp SpringDriving Pawl SpringLatching
Pawl Spring - 9
6 7 56 7 1
ZL5 1 10161A4231P0010137A9252P0010161A4241P0010161A5909P001
6 12 14 15
4 1824 2
** Refer to breaker nameplate or summary for proper voltage
rating.# Quantity Two (2 ) relays required on special control
circuits. Check
breaker and connection diagram.9 Furnish 0161A4241P001 for
breakers without closing spring discharge
mechanism.-9- Relays on Early "-6" design0137A7575P043 -
48V-DC0137A7575P042 - 110V-DC & 125 V-DC0137A7575P041 - 220V-DC
& 250 V-DC0137A7575P045 - 230V-DC, 60 Hz.0137A7575P047 -
115V-AC, 60 Hz.
Zs Refer to breaker auxiliary switch for proper model.Type SBM -
0137A9192G003Type SB-12- 0137A9192G01129
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GEI-88761 Magne-blast Circuit Breaker
RECOMMENDED RENEWAL PARTS FOR MAGNE-BLAST BREAKERS
TYPE AM-4.16-250-6(& ), -7(A ), and -8(* ), 1200 & 2000
AMPERES( A SUFFDC LETTERS H, C. N, K, B, & R)
i:!
i
.!1 Catalog Number for Type AM-4.16-250- No.Fig. Ref. Ampere
RatingDescriptionType Req’d.No. -6 -7 -8No.
30281B0708G002 0281B0708G0020281B0708G008
0281B0708G0020281B0708G008All ** Operating Rod
Assembly218 3All B
I 3 Flexible Connector (Right)Flexible Connector (Left
)Insulating PlateThroat Barrier AssemblyArcing Contact Assembly
0236C0791G0010236C0791G0040414A0116P004
0236C0791G0010236C0791G0040236
C0791G0010236C0791G0040414A0116P004
22 7 All All 322 7 All All 322 12 All All
30195A7388G0020236C0790G00922 13 AllAll 30236C0790G00922
0236C0790G009All All10
120121A5964P001006509787P001
1200 All 242000 All1 Primary Contact Finger Spring23 2
180121A5964P0010121A 5964P001
0121A5964P0010121A5964P001All ** 24All B1
!?:0236C0791P0080236C0791P008
121200 All 242000All
All Primary Contact Finger23 3 180114C 5382P0020114C5382P002
0114C5332P0020114C5382P002**I 24All B
30137A9164P0030137A9164P0040137A9164P0030137A9164P004
1200 All 31200 All!
6All2000 623 2000 All Movable Primary Contact10
0114C5382P0040137A9164P0030137A9164P004
0114C5382P0040137A9164P0030137A9164P004
6All ** 6All B 6All B1
0802B0742G001 3All 0802B0742G001 : 0227A5306G0040802B0742G002
0227A5306G005
Movable Arcing Contact23 14 3All B
pi!
0213X0343G0430213X0343G044
0213X0343G0430213X0343G044
31200 All 0213X0343G0910213X0343G0900213X0343G091
32000 All Tube & Piston Assembly23 13 31200 **II 31200 B1
6All 0414A0117P001 Throat InsulationThroat Insulation (Right )
Throat Insulation (Left )All 0195A7377G001
0195A7377G0020108B1965G0010108B1965G002
37 All All19s 3All AllIf0383A0932P001 0161A5906P0010258C0616P006
0114C5381P0010414A0116P002 0114C5381P004000421711P001
000421711P001000407193P001 000407193P0010258C0616P009 I
0836C0197P014
0161A5906P0010114C5381P0100414A0116P002000421711P001000407193P0010836C0197P014
6 Lower Runner ShieldLower Insulation BarrierInsulating
PlateInsulating CapThreaded Washer (For Insul. Cap)Upper Runner
Insulation
8 All19 All12 All 619 All
1 3 320 All AllAll 618 11 All18 All All 611 6All All*
* Not Illustrated** All except Breakers with "B" in suffix.
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Magne-blast Circuit Breaker GEI-88761
TYPICAL ELEMENTARY WIRING FOR MAGNE-BLAST BREAKERS
+OR 1IX ii il
PD.CS*r Hi AA A/N4, 52* IS4^
52IS
JCAPJ 5 2 Y SPARE CONTACTS5 2-u 5 g_„7f - SM/ LS
L 52r 5 2 Y —r— 5 2 Y AUX . SW 52SM/ LS I J U.T AUX. SW
ON AUX . SWM. 52rr CL/MSLC
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GENERAL ELECTRIC INSTALLATION AND SERVICE ENGINEERING OFFICESFOR
YOUR LASTING SATISFACTION . . . with the performance and
availability of your Gen-eral Electric equipment, GE provides this
nationwide network of field service offices, servingutility,
industrial, transportation and marine users. Qualified field
engineers provide instal-lation, start-up, employee training,
engineering maintenance and other services, throughoutthe
productive life of the equipment. For full information, call your
nearest Installation A Ser-vice Engineering office.
FIELD SERVICE OFFICE CODE KEY* Mechanical & Nuclear Servicet
Electrical & Electronic Servicet Marine ServiceX
Transportation;
ALABAMA LOUISIANA OKLAHOMAt Birmingham 35205 . . . . 2151
Highland Ave.
Mobile 36609Baton Rouge 7080SNew Orleans 70125 . . . . 4747
Earhart Blvd.Shreveport 71104 . . . 2620 Centenary Blvd.Monroe
71201
8312 Florida Blvd.t • t 2000 Classen Blvd.Oklahoma City
73106.Tulsa 74105 . . P. O. Box 7646, Southside Sta.* t t 1111 S.
Beltline Highway * t 1 f
• t1 ALASKA t 1028 North 6th St. OREGONt Eugene 97401.
• T t Portland 97210t Anchorage 99501 115 Whitney Rd. . . . 1170
Pearl St.
2929 NW 29th Ave.MARYLAND* t t Baltimore 21201ARIZONA 1 N.
Charles St.&* t Phoenix 85012
Tucson 85716 .3550 N.Central Ave.. 151 S. Tucson Blvd.
PENNSYLVANIAt MASSACHUSETTS
* t t Wellesley 02181 Allentown 18102Philadelphia 19102 . . . 3
Penn Center PlazaPittsburgh 15222 . . . . 300 6th Avenue Bldg.
1444 Hamilton St.I Washington St. • + IARKANSASI • tt North
Little Rock 72119 120 Main St. MICHIGAN* + J Detroit 48202
T Jackson 49201t Saginaw 48607
. 700 Antoinette St.210 W. Franklin St.CALIFORNIA
* t t Los Angeles 90054t Palo Alto 94303 . .t Sacramento 95808
.t San Diego 92103 . .
* t San Francisco 94119 . . . . 55 Hawthorne St.3035 E. 46th
St.
SOUTH CAROLINAt t Columbia 29204 2700 Middleburg Dr.
Greenville 2.9607. . 41 No. Pleasantburg Dr.. .212 N. Vignes
St.
960 San Antonio Rd.2407 J St.. . 2560 First Ave.
t1008 Second National Bank Bldg.TENNESSEEs MINNESOTAt I Duluth
55802
• t :• t Chattanooga 37411300 W. Superior St.
Minneapolis 55416 . . . 1500 Lilac Drive So. 5800 Bldg, Eastgate
Center3385 Airways Blvd.Vernon 90058* t Memphis 38130.COLORADO
MISSOURI* t Denver 80206 201 University Blvd. TEXAS* + Kansas City
64199 .
St. Louis 63101 . .. 911 Main St.
1015 Locust St.Hi • t Amarillo 79101Beaumont 77704. . . 303 Polk
St.1385 Calder Ave
Corpus Christi 78401. . 205 N. Chaparral St.Dallas 75222 . . . .
8101 Stemmons Freeway
. . . . 215 N. Stanton. . 408 W. Seventh St.4219 Richmond Ave ..
. . . 434 S. Main St.
* tCONNECTICUT ’ T Ji * t Meriden 06450 1 Prestige Dr.H
tMONTANAV * tt 103 N . Wyoming St.Butte 59701FLORIDA
t t Jacksonville 32203 . . . . 4040 Woodcock Dr.t J Miami 33134
,
* t j Tampa 33609 .GEORGIA* t t Atlanta 30309 .
t t Savannah 31405
* t El Paso 79945NEBRASKA t Fort Worth 76102
Houston 77027 . .San Antonio 78204
4100 W. Flagler St.. 2106 S. Lois Ave. * t 409 S. 17th St.Omaha
68102 • t t1
jrt
NEW JERSEYa 25 E. Willow St.Millburn 0704 1* T UTAH1860
Peachtree Rd. , NW
5002 Paulsen St. Salt Lake City 84111 . . 431 S. Third East
St.TNEW YORKt t Albany 12205 . . . . 15 Computer Drive. West
* t J Buffalo 14205 .• t l x New York 10022• Rochester 14604• ft
Syracuse 13206
HAWAn• t 1 Honolulu 96813 VIRGINIA• 1 Newport News 23601
t 1 Richmond 23230 . . . . 1508 Willow Lawn Dr.2018 Colonial
Ave.
625 Delaware Ave.440 Coral St. 311 Main St.$ 641 Lexington Ave..
. . . 89 East Ave.. . . 3532 James St.ILLINOIS• t l x Chicago
60680
INDIANA
Roanoke 24015t840 S. Canal St.% WASHINGTON
• t 1 Seattle 98188NORTH CAROLINA• t 1 Charlotte 28207*
Wilmington
Reigelwood 28456 P. O. Box 186
m t Evansville 47705 . . . 2709 Washington Ave.Fort Wayne 46807
. . . . 3606 S. Calhoun St.Indianapolis 46207 . . . 3750 N.
Meridian St.
141 Providence Rd.r111
112 Andover Park East, TukwilaE. 1805 Trent Ave.t Spokane
99202t* t
Mill WEST VIRGINIAOHIOIOWA
Charleston 25328 . .306 MacCorkle Ave. , SECincinnati 45206
.Cleveland 44104 .Columbus 43229 .Toledo 43G06 . . .Youm'sfi 'wn
44507
2621 Victory Pkwy.1000 Lakeside Ave.. . 1110 Morse Rd.. 3125
Douglas Rd.272 Indianola Ave.
• tDavenport 52805. . . P. O. Box 630, 1039 State St. .
Bettendorf • rt • t t
1 WISCONSIN' ta Appleton 54911. . . . 3003 West College Dr .615
E. Michigan St.t IKENTUCKYmin t % Milwaukee 532022300 Meadow
Dr.Louisville 40218 ttI GENERAL ELECTRIC SERVICE SHOPS1n
WHEN YOU NEED SERVICE ... These G£ Service Shops will repair ,
re-condition, and rebuild your electric apparatus. The facilities
are availableday and night, seven days a week, for work in the
shops or on your prem-
ises. Latest factory methods and genuine GE renewal parts are
used tomaintain performance of your equipment. For full information
about theseservices, contact your nearest service shop or sales
office.
LOUISIANA OKLAHOMAALABAMA5220 S. 100th East Ave.Birmingham 35211
. . 1500 Mims Ave. , S.W.
721 Lakeside Dr.• Baton Rouge 70814 . . . 10955 North Dual St.•
* New Orleans 70114 1115 DeArmas St. •
Tulsa 74145•*• Mobile 36609 OREGON• Eugene 97402•• Portland
97210
. . . 570 Wilson St.2727 NW 29th Ave.MARYLAND•• Baltimore
21230ARIZONA 920 E. Fort Ave.• (Phoenix) Glendale 85019 . 4911
W.Colter St.
3840 W.Clarendon St.• Tucson 85713. . . . 2942 So. Palo Verde
Ave.
if • Phoenix 85019 MASSACHUSETTS• * £ (Boston) Medford 02155
PENNSYLVANIA• Allentown 18103• (Delaware Valley ) Cherry Hill, N .
J., 080341790 E. Mar]ton Pike
841 Oak St.
!V 668 E. Highland St.II 3960 Mystic Valley Pkwy.CALIFORNIA
• Los Angeles 90301 . . . . 6900 Stanford Ave.• (Los Angeles)
Anaheim 92805 MICHIGAN• • A (Detroit ) Riverview . . . . 18075
Krause Ave.• Flint 48505• Johnstown 15802 ^• Philadelphia 19124 . .
. 1040 East Erie Ave.
(Pittsburgh) West Mifflin 151224930 Buttermilk Hollow Rd.
54 N. Harrison St.3601 E. LaPalma Ave. 1506 E. Carpenter
Rd.Hll
15ii•*• (Los Angeles) Inglewood 90301
228 W. Florence Ave. MINNESOTA• Duluth 55807 . . . 50th Ave. W
& StLouis Bay• * Minneapolis 55430 . . . . 2025 49th Ate. ,
N.
• York 17403• Sacramento 95814•* (San Francisco) Oakland 9460899
North 17th St.
SOUTH CAROLINA• (Charleston) No. Charleston 294011650 34 th St.
MISSOURI• * Kansas City 64 120,•• St. Louis 63110
2490 Debonair St.3525 Gardner Ave.. . . 1115 East Rd.COLORADO••
Denver 80205 3353 Larimer St.I TENNESSEE• Knoxville 37914NEW
JERSEY' New Brunswick 08902
CONNECTICUT* * (Southington) Plantsville 06479
2621 Governor John Sevier Hwy.708 North Main St.3 Lawrence St, /
y?*
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