GE AK-1-15 Series User manual

INSTRUCTIONS
GER-180m
, AIR CIRCUIT BREAKERS
Types
K .. l .. 15 and AK .. 1 .. 25
lec:tric:ally Operated
LOW VOL TAGt SWITCHGEAR DEPARTMENT
GENERAL. ELECTRIC
PHILADELPHIA, Pl.
BCS Switchgear Inc.
Switchgear | Circuit Breakers | Parts | Tech Support
bcsswitchgear.com | 888.599.0486
Need Help? 888.599.0486

CONTENTS
PAGE
IN'TRODUCTION ••••••••••••••••••••••••••••••••••••••••••••••••••• eo •• ' ••••••••••• e •••• '. • :3
RENEWAL PARTS •••••• e ' e,.". 0 "
BASIC BREAKER COMPONENTS ••••••••••••••.••••••••••••••••••••.•••••••••••••••••••••
RECEIVING, HANDLING AND STORAGE ••••••••••••••••••.••••••••••••••••••••••••••••••
3
4:
!
4
4
6
6
6
G
6
7
7
7
9
9
9
12
17
17
19
19
20
20
22
24
:;:-
24
GO
24
0
C'o4
26
2
26
-
27
..
27
Q,I
>
29
8
29
......... " _ ••. _ .. __ 0' " " " - ..
Lubrlc'ation "lit II " " • " .- III .. III fit ..
Trouble Shooting " " " "
DRAWO.UT BREAKER •••••• "" " "•• e ••• lit •••• "8 •• ' ' ••• e.
DISCONNECTS • 10 •• " " 8.11 ••••• e- 10 •• e· •• 10 "e..
TYPE AK-1-15Yl-3 AND AK-l .. 25Yl-3 BREAKERS ••.••••.••••.••••••••••••••••••••
MISCELLANEOUS " ••• It "e " -. • " •• " " " e , "
SHUNT TR.IPPIN".G. DEVIC.E ••••••• It 'e " •• e •••••• " ;,. 8"" • 10 •
BELL ALARM AND LOCKOUT DEVICES ••••••••••••••••••••••••••••••••••••••••••••
GENERAL PURPOSE INDOOR ENCLOSING CASE •..••••••.•.•••••••.••.••••••••••••
WEA THER RESISTING ENCLOSING CASE •••••••.••••.••••••.•••.•••.•••••••••••••••
PROTECTIVE. DEVICES .. ; "•• " ""•• "•"e 10 •••• e " " •••• " ••••••• "8 •• " 10 10
TIME DELAY uNDERVOLTAGE TRIPPING DEVICE •••••••••••••••••••••••••••.••••
INSTANTANEQUS UNDERVOLTAGE TRIPPING DEVICE •••••.••••••••••••••••••••••
SERIES OVERCURRENT TRIPPING DEVICE •••••.••••••••••••••••••••••••.•••••••••
REVERSE CURRENT TRIPPING DEVICE •..••••..••••••.•••• ~ •••••••••••••••••••••••
IN'STALLATION •e ••••••••• e- .
LOCA TION •••.••••.•.•••••••••.••••• II •••••••••••••••••••••••••••••••••••••••••••••••• e
MOUNT'IN'G ••••••••••••••••• II II •••• " •••••••••••••••••••••••••••••••••••• e •••••••••••••
CONNECTIONS ••••••••••••• II •••••••••••••• eo. Ii' •••••••••••••••••• ·0 .
MAIN'TENANCE "" .. " " 01 " " " " " II "e " ..
IN'SPECTION ", , II " " .. " " III " " ..
Tools
A.He .QUEN.CHE:R "" .. " " II ..
POLE UN'IT ASSEMBLY II lit " " " "
OPERA T'IN'G MEOHANISM , , , , " """lit , • " ,,' " " " ..
AU'XIl.,IA·RY SW'ITC.H. " .. "", •" "" "" " " .. " ""•••e " " ••••••••••
ELECTRICAL CLOSING DEVICES AND CONTROLS •••••••••••••••••••••••••••.•••••
OPERA TlON •• 0 •• eo •••••••• " e- ••••••••••••••••••••
MANUAL •••• " ••••••••• 0· ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• ".
ELECTRICAL " .. .,,,.,, *' " " .. " " " " 8 " " e " " " " " " • " " " " " " " ..
•
2
BCS Switchgear Inc.
Switchgear | Circuit Breakers | Parts | Tech Support
bcsswitchgear.com | 888.599.0486
Need Help? 888.599.0486

AIR CIRCUIT BREAKERS
E,LECTRICA'LLY O!PERATE'D
TYPES AK·l·1S·3 THR:OU'GH AK·l .. 15·9
AND AK .. l .. 2S~ .. 3THROUGH AK .. l ... 25 .. i9
INTRODUCTION
Before unpacking, installing or attempting to
operate the air circuit breaker described herein,
these instructions should be thoroughly and care-
fully read.
RATINGS
Continuous Interrupt-
Breaker
Current ing Voltage
Type Rating Rating
RMS
RMS
Amperes Amperes
AC
DC
AK-1-15 15
to 225
30,000 240 arid
below
AK-1-15 15 to 225
25,000 241-480
AK-1-15
15 to 225
15,000 481-600
250
AK-1-25 35 to
600
50,000 240 and
below
AK-1 .. 25
35 to 600 35,000 241-480
AK-1 .. 25
35 to 600 25,000
481 .. 600
250
These
circuit breakers are generally used for
protection and control of apparatus and br~nch
circuits, including equipment in buildings, indus-
tries, power stations anq for marine applications
within the ratings designated.
The
AK .. 1 .. 15 and AK-1-25 differ in that the
AK-l .. 25 has one extra contact per pole with cor-
responding difference in the upper stud and inter-
rupter.
All of these models are essentially the same
breaker. As various design improvements and new
features were added, the suffix digit of the type
number was progressively increased. Mainly,
changes maqe
were of a very minor nature. These
are tabulated below:
AK-1-15/25-3
Basic model
AK-1-15/25-4 Improved
nyn relay in sole-
noid control system.
AK~1-15/25-6 Stationary primary disconnect
and cable clamp redesigned.
(Only enclosed
breakers af-
fected.)
AK .. 1 .. 15/25-7 New type of front escutcheon
and closing handle.
Trip but-
ton relocated on escutcheonand
reset lever of bell alarm and
lockout breakers changed.
AK-1-15/25-8 EC-2 overload
trip device used
instead of the EC-l device ex-
cept on units requiringthe short
time delay feature.
AK-1-15/25-9
New drawout frame introduced.
~
RECEIVING, HANDLING AND STORAGE
Immediately upon receipt of the circuit breaker,
an examination should be made for any damage
or loss sustained in transit. If injury' or rough
handling
is evident, adamage claim should be
filed
at once with the transportation company and
the
nearest General Electric Sales Office should
be promptly notified.
The circuit breaker should be unpacked as
'soon as possible after being received. Care should
be used
in unpacking to avo,id damaging any of the
breaker parts. Be sure that no loose parts are
missing or left in the packing material. Blowout
any dirtoi' particles of packing material that may
have accumUlated on the
breaker parts.
If the circuit breaker is not installed at once,
it should be stored in aclean dry place and pre-
ferably placed in avertiCal position. It should be
supported to
prevent bending of studs or damage
to the breaker parts. 'It is advisable not wcover
the breaker with any packing or other material
that absorbs moisture which may cause corrosion
of breaker parts. Acovering of paper will prevent
dust from settling on the breaker parts.
These indrodiom do not purport to.cover all detail. or voriotioM in equi",,*,t nor to provide for every pouibI.
c~ingenc:y to be met in cOllMdiori with indollotioo, OperGtion or moimenonc:e. Should· ·further information be detired
or should particular ~ ari .. which are not coveredauHiciently for the purc:ha..,.'. purpoaU, the malter should
be referred to the GeMroI 8edrk Company.
3
BCS Switchgear Inc.
Switchgear | Circuit Breakers | Parts | Tech Support
bcsswitchgear.com | 888.599.0486
Need Help? 888.599.0486

GEH-1807 Air Circuit Breakers Type AK-1-15 andAK;;'i-25
INSTALLATION e
two bolts holdIDg breaker in
Before being shipped, all breaker adjustments
and settings have been carefully made and checked
by experienced factory personnel. At the
time
of installation, it should only be necessary to
observe the operation of the
breaker to establish
that no unobservable damage has occurred during
shipment.
LOCATION
The air circuit breaker should "'e installed in
a: clean dry place where it is readily accessible
for operation, inspection and proper maintenance.
Special
enclosures are available for 'the installa-
tion of circuit breakers which may be subjected to
dust, and moisture or other unfavorable locations.
MOUNTING
DEAD FRONT BREAKERS
Dead
front circuit breakers are designed for
mounting in aswitchboard or an enclosing case.
The mounting of dead front breakers consIsts in
placing' the breakers within the enclosed structure
and connecting the power buses or cables and mak-
ing the necessary control connections. The standard
mounting depth from the ba.c;k surface of the breaker
base to the back side of the front panel is 8-:V 4".
The front cover of dead front breakers consists
either of ahinged door with cut-out or a plate
bolted to the panel.
oA terminal board on the right side of the
breaker is used for making various control con-
nections with breaker devices. An auxiliary switch
on the left side of the breaker is used for some
control connections and for cQnnecting various
auxiliary accessories.
The structural surface to which the breaker is
bolted must be flat through-out and the supporting
structure must be of sufficient strength to hold the
breaker firmly in place. Minimum cut-out dimen-
sions must be maintamed in order to have proper
electrical clearance.
When disconnects, Fig. 26, are used, the break-
er is placed against the Panel so that the disconnects
fit over the stationary studs to which the power
Circuits
are connected. Four 1/2'" mounting bolts
are ,then inserted into the holes for bolting the
breaker to the panel. When disconnects are not
used, the power
circuits are }:)olted to the breaker
studs after bolting the breaker to the panel by using
the four 1/2" mounting bolts. Breakers mounted in
drawouts or an enclosmg case (see below) are
equipped with disconnects.
ENCLOSED BREAKER
The enclosed air circuit breaker is shipped in
an enclosmg case. To install the enclosed breaker,
proceed as follows:
(a)
General Purpose Indoor
1. Remove cover
from enclosure.
4
2. Remove
place.
3. Remove breaker.
4. Mount case.
5. Make power, control and ground con-
nections.
6. Install breaker in case and replace two
mounting bolts and enclosure cover.
(b) Weather Resistmg
1. Open enclosing case door. A\,,\,
2. Withdraw breaker (see "Weather Re- •
sisting Enclosing Case").
3. Mount
case.
4. Mak,e power, control and ground con-
nections.
5. Insert breaker (see ''Weather Resist-
ing Enclosing Case").
CONNECTIONS
The connections to the circuit breaker studs
should be firmly clamped or bolted in place to
prevent excessive heatllig. The connecting cables
or bus bars should have a current-carrymg capac-
ity sufficient to limit their temperature rise to
that specified for the breakers. If these connecting
cables or bus bars are not of sufficient size, heat
will be conducted
from them to the breaker so that
the breaker cannot carry normal rated current
without exceeding the specified temperature rise.,
Connecting cables or bus bars should be"supported
so that ilie breaker studs will not be subjected to
unnecessary 'strains.
WffiING DIAGRAM
The wiring diagram, Fig. 1, shows atypical
elementary and typical connection diagram with the
breaker in the open position.
When normal voltage is supplied to the control
circuit, either by closing a remote switch or by
pressmg the push button PB, the clo$ing contactor
X coil will become energized through contacts
bb (1-2) and Y(4-3). The Xcontacts will close,
sealmg mthe Xcoil through cOntact X(1-2) and
energizing the breaker closing coil through epntacts,
X(3-4), X(6-5), and X(7-8). The breaker will then
close, thereby openmg the bb contact and closing
the aa contact of the prop switch. Prop switch bb
contact will open the
circuit throu.sI! the Xcontactor
~;ul~on~~:e~gf(3~f), th~ ~6~~er~Jo~~7~~~
Prop switch aa contact will cause the permissive
relay Ycoil to become energized providing contact
is maintained on the closing switch. The Y relay
will also open the circuit of the Xcontactor COil,
thereby providing an anti-pump feature.
Operating the remote trip switch with the _
breaker closmg will cause the shunt trip coil be- •
come energized and will trip the breaker. The trip .
impulse is. interrupted by an "a" contact of the
auxiliary switch.

Air Circuit Breakers Type AK-1-15 and AK-1-25 GEH-180"l
RI A3
~t!.~1
F3 90 A2
f
ALTERNATE WIRING FOR USE WITH
FOLLOWING CONTROL VOLTAGE RATING
440V. AC. 25 ......
575 V. AC. 60-
575 V. AC. 50 ......
575 V. AC. 25 .....
. I O'-':'-T3=~-lcLOSE
'--"''''-J.~. 2 0- T4_I T
---i -t - -- -n:J}--- X- CLOSING
. 30- J"J ::1- ~- -- -n::u--- Y- SOORGE
·40- T2-1 :
1-G:1l-+-<> I 0- --- -I- J TRIP
20- ----t--!f-:::]---X-TRIP
30- ---L---c]---'t SOURCE
040 I
I
05
0
r---EA4
o60i i'?llE2
J! I 3M4~
~I
0-- ---oCUSTOMER WIRING
o--oFACTORY WIRING
o---oFACTORY WIRING FOR ENCLOSED BKR.
CUSTOMER WIRING FOR STATiONARY BKR.
NOTE: Yt1£N SEPARRE POWER SOURCE fOR GLOSING
COL is llSED, OMIT .AJMPERS A1~A3 aA2-A4 THEN
CONNECT OLOSING POWER TO A3 a A4 AND
OONTROL POWER TO AI a .0.2.
A
. I -J..
20 T
OLOSE
:5 - ;.rr:]- --x- OLOSING
. <4 --Ht.:]--~Y- SOUROE
I
I _J
2· --i~'t--X-TRIP
1-"~.JJ3 ---re:.n---Y-SOURCE
04
0
o Go
060
CONNECTION DIAGRAM
1(8 ~ uc 83 KI K2
MH f--Hi
N M P
tc:' "'fE' 'l!lr"
f2~F4
BI~F1
-L
AUX. SW.
6
8
K2
G4 i . GI
9:5 .62
KIO· . .f
v
FI
LIST OF ABBR~VIATIONS
A- TERMINAL BOARD LOCATED. TOP RIGHT,
FRONT VIEW.
B-TERMINAL BOARD-LOCATED UNDER-A.
F-ANTJ-PUMp, PERMISSIVE RELAY.
~(aa-bb)-MECHANISM SWITCH.
K-CXI~ CLOSING CONTAtTOR-3 SETS OF CON-
TACTS IN SERIES (MAIN) aI SET
FOR SEAL-IN.
L-cAux. IIW.I- AUK SW.-2'I:j' a :;!};' CONTACTS
(STIll OR 5'0" a 5''0' (SPECIAL>.
M-(T~-SHUNT TRIP DEVICE.
N-Ce.C.I-SOLENOID CLOSING COIL.
p-CIlI.I-CLOSING SWITCH ON BREAKER.
T-TRANSFORMER.
83
I
I
I
I
,J,
t,J
I
I
I
Y
I
2tc.
x
x
e.c.
.0.4
""
I,
~,
I
Y
¥
r~
II
L~
I
1"
x
CLOSE
r'i
,,
yI
Y
131 ~ -- --if- -- i=-=-=t
3
P.1l.
2
Tx
~
2
21
: v
I
If!:.
3 <4
a
2aa
4I
362
9 5"v
A1M
v
x
10
bb
ELEMENTARY DIAGRAM
fig. I Wiring Diagrams
5

GEH-1807 Air Circuit Breakers Type AK-1-15 and AK-1-25
The breaker can be furnished with or without
amanual operating handle.
Bre~rs which are
equipped with apistol grip operating handle may be
closed by rotating the handle
90
0
in the clockwise
direction. Breakers which do not have a pistol
grip operating handle are closed by means of a
manual maintenance handle. The correct use of
the maintenance handle is shown in Fig. 2. Use of
the handle in an upside-down position can
result in
damage to the
breaker parts and should be avoided.
MANUAL
OPERATION e
The breaker may be trippedmanuallybypushing
the manual
trip button, which is located on the front
escutcheon
or automatically by any of the trip
devices with which the breaker is equipped. The
breaker mechanism will automatically reset when
the
breaker is tripped. The breaker is "trip free"
from the closing mechanism, which assures that it
cannot be closed as long as any trip device is
functioning.
If the escutcheon (9) Fig. 3has been removed
from the breaker, the maintenance handle can no
longer be used. However, the breaker still may be
closed manually by inserting a screw driver in the
position shown in Figs. 5and
5A, and then rotating
its handle upwards and towards the rear of the
breaker.
The breaker may be tripped manually by means
of the trip button or automatically by any of the trip
devices with which it is equipped.
ELECTRICAL
The breaker is closed electrically by means of
apush button, located
on'the front of the breaker,
or by a remote switch. When the closing contact is
made the xcontactor becomes energized, thereby
closing the xcontacts and energizing the breaker
closing solenoid, which causes the breaker to close.
When the breaker closes, the prop switch causes the
breaker closing solenoid to be de-energized.
MAINTENANCE
CLOSING HANOLE
Fig. 2Closing Breaker With Manual
Maintenance Handle
-
CIt
-
$
-
MAINTENANCE
INSPECTION
BEFORE INSPECTION OR ANY MAINTE-
NANCE.
WORK IS DONE, BE SURE THAT THE
BREAKER
IS IN THE OPEN POSITION. ALL
ELECTRICAL POWER,
BOTH PRIMARY AND CON-
TROL SOURCES,
SHOULD ALSO BE DISCON-
NECTED.
Periodic inspection of the circuit breaker is
recommended at least once a year. More frequent
inspections are recommended, if severe load condi-
tions, dust, moisture,
or other unfavorable condi-
tions exist.
If the breaker remains open or closed for a
long
period of time, it is recommended that
arrangements be made to open and close it several
times iil. succession, preferably under load.
At
all times it is important not to permit pencil
lines, paint, oil
or other foreign materials to remain
on the insulating surfaces of the breaker as they
may
cause low resistance between pointsof different
potential and result ineventual electrical breakdown.
6
Always inspect the breaker after a short circuit
current has been interrupted.
At the time of periodic inspection, the following
checks should be made
after the breaker has been
de-energized.
1. Manually operate the breaker several times, A
check for obstructions or excessivefriction. V
2. Electrically operate the breaker' several
times to ascertain whether the electrical
attachments are functioning properly.
3. Arc quencher (See Section
on "Arc
Quencher").
4. Contact condition, wipe, and pressure (See
Section on "Pole Unit Assembly").
5. Latch engagement (See Adjustments under
"Operating Mechanism").
6. Overload device tripping (See Adjustments ,
under "Series Overcurrent Tripping
Device").

Air Circuit Breakers Type AX-I-15 and AX-1-25 GEH-1807
1/16"
5/64"
3/3~"
1/8"
5/16"
TOOLS
The tools listed below will adequately equip an
operator for any maintenance operation on all
types and ratings of the AX air circuit breaker.
#1 J?hillips Screw Driver
#2 Phillips Screw Driver with 8" shaft
#S Phillips Screw Driver
K101-1/2 Crescent (Shor~ Sc. rew Driver
K505-1/2 Crescent (~ng Thin) Screw Driver
KS06 Crescent (Standard) Screw Driver
H-28 ·8'i Gas PIleI'S
654 Pointed Nose Side Cutting 6"
Pliers
#2 Waldes Truarc Pliers Straight
#2 Waldes Truarc Pliers 90
0Angle
Ratchet Socket Wrench
1/2" Drive
7/16" - 1/2" Drive Socket
9/16" - 1/2" Drlve SoCket
5/8" - 1/2" Drive Socket
S/4" - 1/2" Drive Socket
lS/16" -. 1/2" Drive Socket.
15/16" - '1/2" Driver Socket
10" ExWnsion
Bar 1/2" Drive
6" Extension Bar 1/2" Drive
8" Adjustable End Wrench
1/4" - 5/16" (Blue Point) Open End Wrench
1/2" - 9/16" Open End WJ;ench
5/8" - 3/4" Open End Wrench
3/8" -7/16" Open End Wrench
11/32" -5/16" Open End Wrench
Allen Head Wrench
for #6 Screw
Allen Head Wrench for #8 Screw
Allen Head Wrench for #10 Screw
Allen Head Wrench for 1/4" Screw
Straight Shank Allen Head Wrench for
3/8"
screw, with adapter for 1/2" drive ratchet
8oz. Ball peen hammer
5/8" 6point open box wrench
3/8" Spintite
LUBRICATION
In general, the circuit breaker requires
moderate lubrication. Bearing points and latch
surfaces should be lubricated at the regular in-
spection periods with athin film of extreme
temperature, high-pres.sure, light ~ease similar !O
G. E. Spec. No. D50H15. Hardened grease and dirt
should be removed from latch and bearing surfaces.
by using kerosene. ALL EXCESS LUBRICANT
SHOULD BE REMOVED WITH ACLEAN CLOTH IN
ORDER TO AVOID ANY ACCUMULATION OF DmT
OR DUST.
o
TROUBLE SHOOTING
TROUBLE
CAUSE
REMEDY
Overheating Contacts not aligned. Adjust contacts.
Contacts dirty,
greasy or coated with dark film. Clean contacts.
Contacts badly burned
or pitted. Replace contacts.
Current carrying surfaces dirty. Clean
surfaces of current
carrying parts.
Bolts and nuts at terminal connections not tight. Tighten, but do not exceed
elastic limit of bolts or fittings.
Current in excess of breaker rating.
Decrease load, rearrange circuit
or install larger breaker.
Excessive ambient temperature.
Provide adequate ventilation.
Failure to Trip
Travel of tripping device does not provide
Re-adjust or replace trip unit.
positive release of tripping latch. .
Worn or damaged trip unit parts.
Replace trip unit.
Binds
in overioad device. Replace overload device.
False Tripping Overload pick-up too low. Change adjustment
or replace
with higher rated device•.
Overload
time-setting too short.
Change adjustment or replace
with higher rated device.
Bind
in overload device. Replace device.
Failure to Close Binding in attachments preventing resetting
Re-align and adjust attachments.
and Latch of latch.
Chipped
or worn latch. Replace latch.
Latch out of adjustment~
Adjust latch.

GEH-1807 Air Circuit Breakers Type AK-l-15 and AK-1-25
f»):
14
.------25
--.......----16
~~----23
_~122
'----21
-----t---- 20
----~-19
-----18
lIII
~r-----,---17 iA
~:I__---- 24
234
11----'
12---..1
5--------- ........
7----------- ......
6-----------..
9~---- __
8---------~
IO~-----...
1. Muffler
7. Operating
U. Trip Shaft 16. bin Sh.ft
21. Upper
Stud
2. Ii'u,ide
Barrier
Mec:bani_ 12.
Stop Nut 17. CIp 22. Movable O:JntllllCt
3., OUtSide
Barrier
8.
Mounting Screw 13. O'vercurrent
18. Opening
spring
23. Fiber StrllllP
...
Front Clip •Nut Trip Device 19. IO'dating Link 24. Rear Support
5. ClMip
9. Front Escutcheon
14. Lower Stud
:I).
Stationary
25.
Steel Base
6.
StrllP
:10. Rub
15.
Series Coil Contact
26.
Pole Unit Salle t
Fig. 3Right Side View of Breaker
8

Air Circuit Breakers Type AK-1-15 and AK-1-25 GEH-1807
TROUBLE
SHOOTING
TROUBLE
CAUSE
REMEDY
Failure to Close Latch
return spring too weak or broken. Replace spring.
and Latch Hardened
or gummy lubrication on Clean bearing and latch
bearing and latch
surfaces. surfaces.
Closing solenoid burned out. Replace solenoid coil.
Solenoid control device not functioning Re-adjust
or replace device.
proper ly•
BASiC BREAKER ·COMPON.ENTS
ARC QUENCHER
Each arc quencher (see Fig. 3) has several
compolJIld inside barriers (2) containing' a large
number of perforations and two o\ltside barriers (3)
without
perforations, as well as a front cap (4) and
a rear support (24) held in place by afiber strap
(23). Aclamp (5) is attached to the breaker base
by two bOlts. Clamp (5) holds all the arc quencher
assemblies to their respective pole units. Amuf-
fler (1) is located on top of the compound barriers.
The compound barriers and the muffler, together
with the
slots between the barriers, serve to ex-
tinguish the arc. '
The
arc quenchers sh(ijJ],d be inspected at the
regular inspection period and' parts replaced, if
badly burned or corroded.
REPLACEMENT, FIG. 3
1. Remove clamp (5) by removing two bOlts.
2. Unclasp
fiber strap (23).
3. Remove front cap (4), muffler (1), outside
barriers (3), inside barriers (2) and rear
support (24).
4. Install new or disassembled parts in re-
verse order.
NOTE: In re-assembling the rear suppod (24)
to the breaker, be sure and push the rear support
toward the top of the pole unit
so that the clearance
in the rear support will accommodate the screw-
head of the back plate. .
POLE UNIT ASSEMBLY
The contact assembly of each pole unit con-
sists of astationary and amovable contact sub-.
assembly. Refer to Fig. 6.
The stationary contact assembly consists of
parallel contact fingers (3) with silver alloy tips,
the. upper stud (20) and pins (4) with compression
springs (19) which provide continuous contact pres-
sure between the contact fingers and the upper
stud (20). Ashunt (21) is used to prevent pitting
at the pivot point of the stationary fingers when
carrying high momentary currents. .The station-
ary contact fingers are. held in place by the upper
stud
cap(6). .
The movable contact assembly consists of
parallel contact arms (5) with silver alloy tips, a
contact carrier (18) with aspring (17) which pro-
vides continuous contact between the contact arms
and Pin. (11». Aclamp (14) secures pin (15) to the
contact support (16). Aflexible connection
(12) is
provided to prevent pitting .at the pivot point of the
movable contact
arms when carrying high mO:D:\en-
. tar:Y currents.
The movable contact assembly is connected to
the
main shaft (16), Fig. 3, by an insulating link (7)
for operating the contacts 'When the breaker closes.
Adefinite amount of contact pressure. (see "Meas-
uring Contact Pressure") must be exerted by the
movable contacts
against the stationary contacts.
Adefinite amount of contact wipe, or the distance
that the stationary contacts
are pushed to the rear
by the movable contacts (see "Measuring CO;ntact
Wipe"), must result during the closing operation.
Both contact
pressure and contact wipe should be
checked at the regular inspection period.
MEASURING CONTACT PRESSURE, FIG. 6
1. Remove arc quencher (see "Replacements"
under Arc Quencher).
2. Place apush-type scale against the upper
end of the stationary contact tip
(3) with
the breaker closed.
3.
Exert pressure against the push-type scale
until the contacts just part. When the con-
tacts part the scale should register between
4and 6pounds.
4.
Re-assemble parts in reverse order.
MEASURING CONTACT WIPE, FIG. 6
1. Remove arc quencher (see "Replacements"
under
Arc Quencher). . .
2. Measure the dimension between the inside
surface of the pole base and the top edge of
the stationary contact tip (3), (a) with the
breaker open, (b) with the breaker closed.
3. The difference·between these two
measure-
ments should be within the limits of 3/32"
and 1/4'" If not within this range, the con-
tact wipe must be adjusted.
4. With the breaker closed, the stationary con-
tacts should have aminimum of 1/16"
overtravel, measured at the contact tips,
before reaching the
limit of their movement
in the
direction of closing.
5. Replace
arc quencher.
9

GEH-1807 Air Circuit Breakers Type AK-l-15and AK-1-25
ADJUSTING CONTACT WIPE AND CONTACT
PRESSURE, FIG. 6
1. Remove arc quenchers (see "Replacements"
under Arc Quencher).
2. Remove tru-arc retaining ring from main
shaft (16), Fig. ;3, nearest the insulating
link and contact assembly to be adjusted.
3. Loosen clamp (9) which secures eccentric
bushing (8).
4. Turn .the eccentric bushing in the insulating
link (7) threby moving the insulating link
closer or farther away from the stationary
contacts, as required to obtain proper Wipe.
5. Re assemble parts in the reverse order
after making adjustments.
NOTE: To adjust the insulating link in the
center pole unit, first, push the main shaft through
the
right hand insulating link and into the. center
link as described in item 2and 3above. Opening
spring and cap will drop out. Adjust center in-
sulating link as described in item 4above. Re-
assemble parts in reverse order being careful to
replace opening spring and cap in their proper
position.
If any of the contacts are badly corroded or
pitted, thereby making it impossible to adjust for
proper contact pressure or contact wipe, such
stationary contacts or movable contact assemblies
should be replaced. See "Replacements" below.
If the proper contact pressure does not exist
when the wipe is within its limits, the stationary
contact springs must be replaced.
REPLACEMENTS
Movable Contact Assembly,
Fig. 6
1. Remove arc quenchers (see "Replacement"
under "Arc Quencher").
2. Remove main shaft from breaker by re-
moving tru-arc retainer from one end and
pushing
shaft through insulating links (7).
As
shaft clears the mechanism side frames
the opening springs and caps, (17) and (18)
Fig. 3, will probably drop out of their re-
cesses in the Side frames. If breaker is of
the drawout type, handle socket,
interlock
lever, bushing and nut must be removed on
side from which the main shaft is to be
removed. (See Figs. 4 and 5.)
3. Remove upper mechanism mounting screws
(refer to Fig. 4).
4. Loosen lower mechanism mounting screws
by using screw driver in slot provided on
threaded end of screw which projects through
back
frame of breaker. (See Fig. 7.)
5. Mechanism and attached components may
now be lifted
clear of the breaker. If
breaker is of the drawout type, movement
of the
mechanism will be somewhat re-
stricted by control wires. There will be
enough
freedom, however, to allowthe mech-
anism to be lifted to the top of the drawout
fram~ where it can be secured by tying.
(See .1''ig. 8.)
10
6. Remove insulating link (7) by removing
tru-arc and drifting out pin (11).
7. Remove clamps (14) by removing fastening
hardware.
8. Remove series coil terminal bolts. Movable
contact
unit is now free and may be removed.
9. Breaker may now be reassembled with new
contact
assembly by reversing the above
described procedure. In remounting mech-
anism, be sure that dowels ir. mechanism
side frames are well seated in dowel holes
in the pole unit base. (See Fig. 8.) It will
also· be necessary to COmpress the opening
spring and cap in the recess in the mech-
ariism side frame in order to obtain clear-
ance for replacement of the main shaft.
10. Check contact wipe and pressure and adjust
if necessary.
FI g. Il Arc Quenc:hen and Handle Socket
Removed fro. Drawout Breaker
Fig. 5 Removal of Main Shaft f~
Drawout Breaker
t>
-

Air Circuit Breakers Type AK-1-15 and AK-,1-25 GEH-1807
222
21
320
4
5
19
-
::I" 6
co
18
co
C')
~
7
17
co
cL
-
co
16
a.
""
8
15
9
(e
14
10
II
12
13
1.
Pole Unit S •• e6. Upper
Stud Cap 12. Flexible Connection
2.
Fiber Strap 7. Insulating Link & Temnll1
3.
Stationa..,. Qmtlllct
8. Eccentric Bullhing 13. Lower Stud
4. Contact Pin
9. C&IIIIp 14.
ClIIIIIIp
S. Movable Contact
10. Screw' 15.
Pin.
Ant
U. Pin
16.
Contact Support
11. Spring
18. Contact Carrier
19. Spring
20. Upper Stud
21. Shunt
22. Steel Plate
Fig. 6Pole Unit Assembly
11

GEH,.1~07 AirCirc\rl,t Breakers Type AX-I-1S and AX-1-25
Stationary Contact
(3) Fig. 4
1. Remove arc quencher (see Replacements"
under Arc Quencher). ...
2. Remove upper stud cap (6) by removing two
holding. screws.
3. Pry the stationary contact (3) from upper
stud (20). On outside poles, the stationary
contacts are readUy accessi'ble. On the
center pole, it is recommended that the
mechanism be taken off the breaker to
facilitate
removal of the contacts. Thismay
be done by following steps Ito 5of the
procedure for replacing movable contacts.
4. Replace the new stationary contact in re-
verse order. (It may be necessary to tap
the new stationary contact intoplaceby using
arawhide mallet).
5. Adjust contact wipe and contact pressure
(see above).
Fig. 8 ReMoval of Stationary Contact.
-
Fig. 7Loosening Lower Meehan!. Mounting Bolb
OPERATING MECHANISM
WITHOUT CLOSING HANDLE
The operating mechanism, see Fig. 10, is sup-
ported between two molded side frames in front of
the
center pole unit. It consists of atoggle. linkage
(19), crank (5)1 latch (15), trip shaft (12), roller (6),
closing links (1), and armature (14).
When the coil (8) is energized it pulls armature
(14) dOWtlward, which, thropgh closing links (1),
causes the toggle linkage (19) to straighten. This
motion causes the main shaft (18) and movable
contacts to move to the
closed position. As soon as
the toggle linkage is straightened the proper (23)
moves ·on tor of prop pin (20) and roller (6) moves
on
latch (15 thereby holding the mechanism in the
closed ~sition. The motion of the prop (23) causes
switch (25) to operate, thusde-energizingtheclosing
coil.
The
breaker mechanism is tripped by rotating
the trip shaft (12), and releasing latch (15) which
causes the toggle linkage to collapse, thereby
allowing the opening springs (17) to push the main
shaft and movable contacts forward to the open
position.
Trip latch (15) is automatically reset
during the opening operation providing none of the
trip devices are a~tuated. Latch adjusting .screw
(9) limits the rotation of the trip shaft (12) and thus
determines the amount of latch engagement.
To
operate the breaker manually see section
on "Operation".
ADJUSTMENTS, FIG. 1Q
Latch (15) is adjusted to provide approximately
5/64" engagement between latch and roller (6). To
adjust for proper latch engagement, follow the pro-
cedure described below:
1. Loosen locknut on adjusting screw (9).
2. Hold breaker contacts in aposition in which
the movable contacts are just touching the
stationary contacts. This may be done by
any of the provided means of manualclosing.
3. Turn down adjusting screw (9) until breaker
trips open. Normally the force required to
rotate the trip shaft is small enough so that
the spring on the buffer paddle (10) is not
noticeably deflected.
If any defleCtion is
observed while turning down the screw, back
off
screw until spring returns, then turn
down screw again. If deflection persists,
check trip shaft for binds.
4. Mark position of adjusting screw head~
5. Repeat steps 2and 3and check position of
adjusting
screw in relation to marked posi-
tion.
6. If adjusting screw is in the same p6s1tion as
it was in the first tripping, back off the
screw 3full turns and tighten locknut. If it
is not, repeat steps 2and 3until aconstant
tripping position is determined before back-
ing off the three turns and locking. This
check is necessary to avoid. a false setting
due to accidental tripping. .
7. Operate the breaker electrically several
times to make sure that the mechanism
functions correctly.
The stop nuts (13) should be adjusted so that
there is approximately 1/16" clearance between
the bottom of the magnet and the upper stop nut.
This will restrict linkage movement in trip,ping but
allow enough movement
for the mechanism to reset.
-
~
Z
i
-

Air Circuit Breakers Type AK-1-15 and AK':'1-25 GE~-1807
•. ' ..•. " ..
,~~.
(I
,I
(~,
REPLACEMENTS, FIG. 10
Mechanism
1. Remove arc quenchers (see "Replacement"
under "Arc Quencher").
2. RemOve escutcheon (4).
3. If breaker is supplied with a terminal block,
dismount block by removing two screws in
back which fasten it tothesupporting bracket.
4. Remove shunt trip supporting bracket by
taking out the two screws which fasten it to
the mechanism side frame. The nuts for
these screws are looselyheldinthe recesses
on the inner side of the frame. If breaker
is supplied with an undervoltage device,
this also wUl be dismounted since it is held
by the
same supporting bracket.
5. If breaker is supplied with a closing switch,
dismount switch base by removing two
screws (10), Fig. 14.
6. Remove solenoid control device cover.
7. Remove XcOntactor and Y relay together,
first removing two screws securing Y relay
to arm which projects from magnet, then
loosening the
three screws which fasten the
XcOntactor to the supporting arms. Both
devices can then be removed by lifting
slightly and moving towards front of breaker.
eB. Remove stop nuts from armature plunger
(13),
Fig. 10. •
9. Remove lower section of magnet and
closing
coil by taking out four screws (7).
10. Remove upper section of magnet by taking
out two screws which fasten it to mecha-
nism Elide frames. (see Fig. 9).
11. Remove auxiliary switch by taking out bolt
(1) and screw (4), Fig. 13.
12. Remove cutoff switch (25) by removing lock-
nuts (24).
13. Remove tru-arc and take out main shaft (18)
being
careful not to lose opening spring (17}
and cap which may pop out when main shaft
is removed.
14. Take off mechanism by removing mounting
screws from mechanism frame.
15. Mechanism may now be replaced as a unit
or disassembled and then reassembled with
new parts as needed.
16.
Reassembly of the breaker is accomplished
by
reversing the procedure described. In
replacing the mechanism, make sure that the
dowels on the mechanism side frames are
properly seated in the dowel holes in the
pole unit base; also that the opening springs
and caps are positioned properly when re-
placing the main shaft. .
17. Adjust prop switch as described under "Ad-
justments" in "Solenoid Control System" and
check operation of breaker manually and
electrically.
NOTE: If areasonable amount of care is
exercised, wiring lead connections will not be
overstressed and need not be disconnected in the
course of the disassembly procedure. The electrical
accessories may be tied up out of the way of the
operator. If leads are disconnected, they should be
marked to avoid incorrect reconnection.
Opening Springs (17) Fig. 10 or (16) Fig. 11
Opening springs may be replaced by follOwing
the
first two steps of the procedure for' replacing
the movable contact a.ssembly.
Fig. 9 Dismounting Upper Section of Magnet
WITHCLOSlNG HANDLE, FIG. 11
The electrically operated mechanism equipped
with amanual operating handle is shown in Fig. 11.
This mechanism is similar to the one furnished
without an operating handle with the following ex-
ceptions:
a. There is only one stop nut (11) on the lower
end of the rod extending from the armature
(12) since there is no need to provide for
operation by the maintenance handle.
b. The mechanism which is furnished with an
operating handle contains a cam support (7)
and cam (6) (see Fig. 11), whereas the
mechanism furnished without an operating
handle contains neither oUhese parts.
The sequence for electrical operation is the
same as given for the mechanism furnished without
an operating handle. (Refer to the second paragraph
under, "Operating Mechanism -Without Closing
Handle").
13

GEH,;,1807A1rClrcuit Bre~ers Type AK-l..o15 and AK-1-25
Turning
the operating handle (5) in the clock-
wise directiol1,
90
0,causes a
roller attached to the
operating shaft to engage cam
(6) thereby moving
the
caxn support (7) toward link (4). See Fig. U.
This motion straightens the operating linkage,
thereby moving the main shaft (17) and movable
contacts to the closed position. Prop (22), engaging
pin (19), and latch (13) l'esting on roller (8) will
hold the contacts in the closed position. Rotating
the tripslm.ft (14) in the counter-clockwise dire.ction
will release the roller (8) which cannes the toggle
linkage to collapse thereby allowipg the opening
springs (16) to push the main shaft and movable
contacts forward to the open position. Trip latch
(13) is automatically reset during the opening
operation, providing none (,If the "trip devices are
actua~ ,
Adjustments
In addition to the adjustments shown formecha-
nisms furnished without an operating handle, ad-
justmentscrew(26) must be set for proper ope,ra-
tion. This adjustment
is satisfactory if th~ screw
is Bet in such aposition that the following two
conditions are met:
1. In closing, there mUst be enough overtravel
of the mechanism to,easily allow prop (22)
to move on pin (19). Fig. 11.
2. When the breaker is open, roller (8) must
clearly be free of contact with latch (13).
62
o
~~-._- --r--,9
~~=;:;:;:;;;;;I_-,8
-
=
7
~
...
2
IN
-
0
-
m
~
-
u..
5
4t]
~,
1. Clodn" LiilIt
2. e- lZetu.m ~ri~1
3. Bold In Poat
4. JtlCutmeon
5. Cr_
6. .llel'
7. Screw
8. COil
9. Torlp Shaft
Adj. Screw
m. Buffer Paddle
Jl. Trip Shaft
Ret. ~rip.g
12. Trip Shaft
13. Stop tfUt
14. Anulture
15. Latch
16. Mech. Frlllllle
1'1. Opening Spring
18. lain Shaft
19. TOlele LiD&:
2). Pia
21. Reset Spring
22. Prop Pin
23. Prop
24.Lodwuta
25. Switch
26. Sctn
Fig. 10 Operating Meehan iu Without Operating Handle
14

Ail' Circuit Breakers Type AK-1-15 and AK .. 1-25 GEH-1807
(I
Replacements
The replacement of
parts in the operating
mechanism furnished with amanual handle
are
similar to those for the mechanism furnished with-
out ahandle, with the following additions:
Front Escutcheon Assembly
1. Remove four mounting screws (8), Fig. 3.
2.
Now pull forward on .the operating handle
turning and tipping the front escutcheon
slightly until dislodged from the breaker.
3. To temount the front escutcheon assembly,
first, hold the trip shaft in atrip free
position. Then p\1ll the cam support, (7)
Fig. 11, slightly forward.
4. Insert the operating shaft and roller into
the hole of the cam support so. that the
roller drops behind cam (6), Fig. U.
5. Replace the four mounting screws to Secure
the front escutcheon assembly to the mech-
anism frame.
Replacing the Operating Handle
1. Remove the short set screw from the tap-
ped hole in the operating handle.
2. Back off asecond longer
set screw f~om
the same tapped hole until it is moved clear
of the shaft.
3. Pull forward on operating handle until
it
is released from the front escutcheon and
operating shaft.
4. Re-assemble operating handle to front
es-
cutcheon and operating shaft in reverse
order.
/
1. Clodne Link
2. e:- Return
Spring
3. Bold In Pod
4-. Liilk
5. Bmdle
6. e-
2
4
5
8
9
10
225
'I. e- Suppo.rt
8. Roller
9. SCI''''
10. Coil
u. Stop N"ut
12. Amature
13. Latch
II
14. Trip Shaft
15. e- RoUer
16. OpenAnl Spriq
1'1. Wit Shaft
18. Togle Link
19. Pin
2>. Re.et !prine
19
16
15
4
13
12
21. PfOP Pin
22. Prop
23. LodmutIIJ
24. hitch
25. ScI''''
26. Ac1Julltinc
Screw
fi g. II Operating Meehanl. With Closing Handle
15

GEH-1807 Air Circuit Brellkers Type AK-1-15 and AK-1-25
Fig. 12 Position Indicator
Addition of o1osing Handle
If it is desired to add amanual closing handle
to a breaker which was not furnished with one
Originally, the conversion may
be made by following
the procedure below. Required
parts -catalog num-
bers maY be obtained by reference to Renewal
Parts Bulletin GEF-3506.
1. Follow steps 1to 14 of procedure foi' re-
placement of. the mechanism.
2. After mechanism
has been removed, remove
right mechanism side frame bY removing
hardware
at (3) and (26), FiK. 10, an trip
shaft attachments to the rignt of the mech-
anism, and the trip shaft retaining riDge
3. The toggle llnbge and armature, now free
of the mechanism side frames, may be
ditJassembled and
reassembled withthe parts
required for manua.loperation. Return
spring,
(2) Fig. 11, replaces (2) Fig. 10, and
cam support, (7) Fig. 11, is added to the
linkage assembly. Fig. 11 shows how the
linkage should be reassembled.
4. Reassemble mechanism and breaker parts
with exception of escutcheon.
5. Mount new escutcheon assembly, which will
include amanual operating handle,
accord-
ing to the directions in the section 'titled
''WITH CLOSING HANDLE" under"Replace-
ments". ,
6. Adjust screw,
(26) Fig~ 11, as described i.I1
"Adjustments" under ''WITH CLOSING HAN-
DLE."
7. Check manual and
electrical operation of
breaker.
1. Stationaty IncU:cstor
(~-)
2. IiIovab1e Indicator
(Closed)
3. Link
4. Crn
5. Meehani.
Fr._
i
I
-
IN
...
2 ----- b:.r~
4----
m------7
B---"'
9---"
10----..
11------1.11
12----'
13---~
STAGE OF SWITCH SHOWING
BREAKER IN OPEN POSITION
16
-
I
15
::k'
C'lI
-
W
..;,
-
u..
14
.~\)'
:/)1
1)
16
1. Ibmtinc Jb1t
2. Tie Jb1t
3. Shaft
4. Screw
5. BottOM Covell'
6. Ind Plilte
7. 1bp ODver
8. 's' Contact1ll
Fig. 13
9. Contact SpdDl
11), Rocker Ant
U. Pin
12. e-
13. 'b' Contacta
14. 'b' Tell'llinal.
15. '.' Tentinal.
16. Barder

Air Circuit Breakers Type AK-1-15 and AK':'1-25 GEH-la07
AUXILIARY SWITCH
FIGURE 13
The auxiliary switch is mounted on the left side
of the operating mechanism. The main shaft (17),
Fig. 11, of the breaker causes crank (4), Fig. 12; to
rotate as the breaker opens and closes. The crank
operates the auxiliary switch shaft (3), Fig. 13 which
opens and closes the "a" and ''b'' contacts of the
switch. (The
"a" contacts are openwhenthe breaker
is open; the "b" contacts are closedwhenthe breaker
is open). The opening and closing of the auxiliary
switch contacts is determined by an arrangement of
cams. (12), mounted on the auxiliary switch shaft
(3). The tOp terminals of the switch are "ai' con-
tacts, the bottom terminals are lib" contacts.
8. Moveb1e Qmtact
9. Oucll::et
10. Screw
U. Cloaiilt; Solenoid
12. matiOWl!')'
Contact
13. Inaubtion: Strip
9 10
1. Front Escutcheon
2. Retaine ...
3. Braclret
4·. Rivet.
S. Pum Button
6~ Spring
7. Spacer
The stationary contacts (12) and insulation
strip (13) are attached to the closing solenoid by
bracket (9) and screws (10). A remote closing
switch may be used to close the circuit of the
solenoid control system, thereby energizing the
closing solenoid.
Adjustments
The closing switch· requires no attention, other
than cleaning of contact occasionally.
SOLENOID CONTROL SYSTEM
This system consists of an X contactorand
Y relay (see Fig. 15) which are located on the left
side of the operating mechanislll'
It also contains
aprop switch (25), Fig. 10, which is located in the
top
front of the operating mechanism (looking from
the iront). The sequence of operation
is as follows:
a. When the closing switch is closed, the coil
of the Xcontactor becomes energized.
b. The contacts of the X contactormake,
sealing its coil in and also energizing the
breaker closing coil. •
c. The breaker then closes and latches causing
the bb contact of the prop switch (25),
Fig. 10, to open thereby de-energizing the
Xcontactor coil and the
breaker closing
coil.
NOTE:
If the closing switch is closed while
the breaker is in the closed position, or if it re-
mains closed after the breaker closes. the coil of
CLOSING DEVICES
CONTROL'S
ELECTRICAL
AND
The electrical closing devices and controls
consist of the following:
a. Closing Switch
b. Solenoid Control System
c. Closing Solenoid
CLOSING SWITCH, FIG. 14
The closing switch is located in the lower right
hand corner of the front escutcheon (1).
Apush button extends through thefront
escutch-
eon and is supported by bracket (3). Spring (6) re-
turns the push button to a neutral positibn after the
movable contact
(8) has momentarily engaged the
stationary contacts (12). Two retainers (2) and
spacer (7) are used to hold the movable contact in
plat:e.
ADJUSTMENTS, FIG.
13
The contacts of any stage may be changed from
"a" to "b" or vice versa. If changes are desired in
the operation of the contacts, an approved drawing
of the cam (12) arrangement should be obtained or
acareful sketch made. In order to change an "a"
contact to a"b" contact, it is necessary to remove
the four tie bolts
~) and change the position of the
particular cam 90 in relation to the shaft. Con-
tacts should be cleaned occasionally to insure prop-
er performance.
REPLACEMENTS, FIG. 13 '
1. Disconnect
all leads to the auxiliary switch.
2. Remove mounting bolt
(1) and screw (4) td
remove device from breaker. .
3. If no approved sketch of the cam arrange-
ment is available, remove the end plate (6)
froQ:!. the device by removing the four tie
bolts (2) and draw asketch of the position
of the particular cam in relation tothe shaft.
4. Before installing the new deVice,
see that
the cams are in the same position as in the
device that is being replaced.
5. Install the new device in reverse order.
•
•
•

GEH-180'l Air Circw.t Breakers Type AK-1-15and AK-1-25
Fig. 16 XContactor and Y Relay
The closing solenoid is connected in series
with the main contacts on the Xcontactor and is
energized or de-energized when these contacts are
closed or opened, respectively. When the closing
solenoid
is energized, its armature (14) is drawn
downward into the coil (8) pulling the four Closing
links
(1) in the same direction. This action
straightens the toggle linkage (19), of the operating
mechanism, thereby closfug the
breaker. As the
operating mechanism moves into the closed posi-
tion, the prop switch (25) operates, causing the X
contactor coil and breaker closing coil (8) to pe
de-energized.
Adjustment
The stop nut (13) Fig. 10, should be set so that
there is approximately 1/16" clearance between the
nut and the magnet when the breaker is in the open
position. This adjustment
is reqUired in order to
allow the mechanism linkage to
reset.
Replacements, Fig. 10
Closing Solenoid
1. Remove the Xcontactor and Y relay (see
"Replacements" under Solenoid Control
System).
2. Remove stop nut (13).
!
r
I
f
L
the Y relay will become energized through the aa
contact of the prop switch (25), Fig. 10. This will
open the circuit to the Xcontactor coil, thereby
preventing the Xcontactor
from operating. This
feature makes
it impossible to operate the closing
solenoid when the
breaker is already closed. It
also provides for cut-off of the closing solenoid and
anti-pump operatiQn.
Adjustments
The only adjuf.'tment required for thif.' system is
on the prop switch (25}z Fig. 10. To make this
adjustment
proceed as fOllOwS:
1. Press the trip button in the front of the
breaker.
2. Maintain pressure on the trip button and at
the 'same time close the breaker with the
maintenance operating handle, see
F:ig •. 2.
S. The prop switch (25), Fig. 10, shouldoperate
just before the arm.ature (14), Fig. 10,
reaches the end of its stroke. To obtain
this adjustment move the prop switchtoward
or away from the prop (2S), Fig. 10. Moving
the switch too close to the
prop can result in
damage to the switch
if its operating button
is forced to travel beyond the lim.it .of its
movement. It is also possible, in this case,
for the switchnot to togglf3 when the breaker
closes. (When the breaker closes, the prop
mOVeS away from the switch and the button
is extended). Thiswouldleave the bbcontacts
closed with the
bre~r closed, and burn out
the contactor and closing solenoid coils. If,
on the other hand, the switch is too far away
from the prop, it is possible for the bb con-
tacts to remain open when the breaker is
open. This would make it impossibleto close
the breaker electrically. Thisconditioncould
also result in false tripping even though the
switch may operate, since the
thrust of the
switch button
is depended upon to move the
prop into position and hold it in place on
breaker closing operations.
Replacements
XContactor and YRelay, Fig. 15
1. Remove cover.
2. Disconnect wiring.
S. Remove .two screws which fasten Yrelay to
upper extension of magnet
frame.
4. Loosen three screws which fasten Xcon-
tactor to magnet frame extensions.
5. Replace new device in
reverse order.
Prop Switch (25), Fig. 10
1. Remove wiring.
2. Remove locknuts (24)
from switch.
3. Replace switch in
reverse order.
CLOSING SOLENOID, FIG. 10
The closing solenoid
is located directly below
the operating mechanism. It consists of acoil (8),
am.agnet, an armature (14), and foUr closinglinks (1).
18
2
1. Uti. Seren. Y Relay
2. IItl. Seren. X Contactor
4
3. :It Contadol"
4. Y Ilelay
i=
-
=
-.
IIlII
- ....

Air Circuit Breakers Type AK ... l-15 and AK-1-25 GEH..;1807
3. RelDove four screwa(7) which attach lower
pa~,t of magnet to upper part of magnet.
4. Remove two
screws which attach upper
part of .magnet to the two side frames of
the operating mechanism.
5. Ins.tall new closing solenoid in reverse
order.
CoU (8), Fig. 10
1. Remove
low~er member of magnet, (see
"Closing Solenoid" under "Replacements",
items 1to 3).
2. Remove wiririg to coU(8) and remove coU.
3. Remove brass coU guides.
4. Install new coU in
reverse order.
PROTECTIVE DEVIC,ES
19
fig. 86 TIllie Delay I.Indervoltage Trlpplnt Device
>----16
~----23
19.. Lucld.DC fiire
2Q'. AdjulIt!nw Berna
21. lIIount.lol Ie ....
22. Trip Paddle 1& Cl8IIIIP
23. S'upPOIl'UOI Bll'adl:et
)L_---.::~~---15
'-----14
14 .• Ihpet
15. Coil
16. Berns
1'1. Pm
18. MjulIUq Screw
ADJUSTMENTS, FIG. 16
An adjusting screw (20) in the trip lever is
used to allow from 1/32 to 1/16 inch overtravel
after' tripping the breaker.
Adjusting screw (2) is used to adjust the arma-
ture sO that it will pick-up at 80% of normal voltage
and drop out between 30% and 60% of normal
voltage.
Adjusting nut (8) on connecting rod (11) is in-
tended for aminimum amount of adjustment of. the
time delay setting. From 1/4 to 3/8 inch of oU
should be maintained in the cylinder at all tiQ).es.
In order to make an inspectionoftheoU, the cylinder
Qlay be unscrewed from the cap. G. E. silicone oU
9981LT40NV or simUar grade should be used in the
cylinder.
1!:::::=---22
:--'''--1+---21
~~k==20
_______ r1'-_--"'o--Ln..:>., f""' 19
"""'--'---18
~~~~-~'17
----r-r-:~S
10·. Cylinder
a.ConnectiOn
Rpd
12. Pluncer
13. C18l11P
S. Shading RiiJg
6. Pm
1. Clevis
B. MjulIUitg Nut .
9.'CIp
A2
010
020
3
030
4
040
5
010
0206
030
78
F~i
40-
~-rr==:n--
9
50
-n----'
10
- '~ __ Lr-
060
II
IB
12
B5~4
13
J
U.V
1. Bracket
2. Adjulltine Screw
1& Nut
3. Analore
4. Spring
This device is mounted to a bracket On the
right side of the operating mechanism (looking
from .the front). The purpose of this device is to
trip the breaker for undervoltage. For rated voltag~t
the armature (3) is attracted by magnet (14). n
the voltage falls below a predetermined value the
magnet (14)
releases the arQlature (3). Spring (4)
then pulls armature (3) upward. against the restrain-
ing force of the oil in cylinder (19); this action
causes aminimum time delay of 3seconds. When
the spring. overcomes the' restraining force of the
oU the armature engages screw (20) thus rotating
the trip shaft and opening the breaker. (For parts
reference refer to Fig. 16.) ,
TIME DELAY UNDERVOLTAGE
TRIPPING ,DEVICE

GEH-180'1 Air Circuit Breakers Type AK-I-15 and AK-1-25
REPLACEMENTS, FIG. 16
Coil
The only part of the undervoltage device that 1s
likely to
require replacement during the life of the
breaker is the coil (15). 'l'he replacement procedure
follows:
1. Disconnect coil lea.cUJ.
2. Remove two screws (16), freeing magnet
(14) and coil (15) from device. {It may be
more convenient to remove the entire device
from its supporting. bracket (23) before
removing the magnet and coil. If the device
is of the time-delay type, bracket (1) will
also bave to be reJlloved from bracket (23).)
3.
straighten laminations which were bent to
hold sbading'ring (5) inr.lace.
4. ReJllove sbading ring (5 • .
5. straighten end of coil Clamp (13).
6. Remove coil, install new coil, andre-
assemble device by reversing disassembly
procedure. (Note:- It is advisable to re-
place, the magnet and coil assembly as
nearly as possible in its exact original
position in relati.onto the device, frame.
Before removing the magnet, note or mark
its position relative to the frame. Doing
this will result in baving the same open
air gap between ,armature and magnet and'
will insure the device's picking up at the
same voltage value).
Device
If the entire device is replaced, simply remove
the bardware fastening the frame of the device to
supportln~ bracket (23). If a time-delay device,
bracket (1) must also be removed from (23).
ADJUSTMENTS
When the
armature (3) is open (coil deener-
~ed) it must pusl1 the trip paddle (22) .at least
1/32" of an" inch beyond the point at which the
breaker trips. This may be checked by placing a
1/32" . feeler gau~e between the armature and the
head of
screw (2) with the breaker in the closed
position and the armature held closed against the
magnet. When the armature is released, it should
JllOVe under the action of spring (4) just far enough
tc;» trip the breaker. This will ensure pOsitive
tripping of the breaker by the device. Adjustment
is obtained by means of screw (20) which may be
advanced towards the armature or retarded.
The armature pickup point isa function of the
open air gap of the armature. The air gap is set by
means of adjusting screw (2). This gap shoul.d be
set so that the armature will "pick up" at 80% of
rated voltage. In order to check this adjustment, a
variable voltage so~ce is necessary. The gap
should be increased if "pick up" occurs at less
than 80% of voltage or decreased if it occurs at
more than 80%.
20
"Drop out" -andsubsequellt tripping of the
breaker is afunction of the tension of spring (4).
This is afactory adjustment. It should not be
necessary to ever reset this adjustment in the
field.
INSTANTANEOUS UNDERVOLTAGE
TRIPPING DEVICE
This undervoltage tripping device is constructed
similarly to the time delay undervoltage tripping
device with the exception that the cylinder (10),
{llung .
er (12), connecting rod (H), clevis (7), bracket
(1), and adjusting nut (8), as shown in Fig. 10 are
omitted.
The
adjustments and replacements for this
device
are also the same as those for the time
delay undervoltage tripping device.
SERIES OVERCURR:ENT •
TRIPPING DEVICE
There are two types of overcurrent trip devices
with which the
breaker may be equipped. These
are the EC-1 and the EC-2 devices. The principal
difference between these two is that the former may
bave time delay cbaracteristics which include a
short time delay. The latter is used only for long
time delay and instantaneous cbaracteristics, or
combinations of these two. For a description of the
operation
and adjustments of the EC-2 device, refer .•... ~.
to Instruction Book GEI-50216. .
Each series overcurrent tripping device is
enclosed in amolded case and mounted by three
screws and a bracket to the lower part of the pole
unit base.
The EC -1 device can be provided with the
following tripping combinations:
1. Long time delay, short time delay and
instantaneous tripping.
2. LQng time and .short time delay tripping
only.
3. Long
time delay and instantaneous tripping.
4.
Short time delay and instantaneous tripping.
5.
Short time delay tripping only.
6. Instantaneous tripping.
(a) Adjustable
(b) Nonadjustable
SHORT TIME DELAY TRIPPING, FIG. 17
The
armature (7) is retained by calibrating
spring (8). After the magnetic force, produced by
an overcurrent condition, overcomes this restrain-
ing force, the aramature movement is further re-
tarded by an escapement mechanism which produces
an inverse time delay characteristic. Thl;' mecha-
nism is shown in the left side view of Fig. 17.
The pickup for this device can be field set
between limits baving a ratio of 2-1/2 to 1 in the
range of 200 to 1000% of the coil rating. ,