GE AKR-75 Series Programming manual

GEt-861518
INSTRUCTIONS _
INSTALLATION AND OPERATION
AKR'75 & AKR-I OO
LOW.VOLTAGE POWER CIRCUIT BREAKERS
AKR.sA.l OO
Manually operated, AKD-S type
AKR-5-100
Manually operated, AKD type
i, ,.:.,-.. , T:*;"
AKR.5B.75
Electrically operated, substructure type
i;
t:: w
.:d ]{
.$.:r& 1i:.:,.\r:,t
'a,.:: ' 1l'::
Lu ""
Y*
B
-tr
;+s
X.
i*:,rr
i. $':l--i}liiir'
. F;'r.:
,,*i
k,'*-
AKR-sC-75
Electrically operated, AKD-6 type
l,s;
S;Ff
:
i

INSTALLATION AND OPERATION
OF TYPE AKR.75 AND AKR-IOO
LOW.VOLTAGE POWER CIRCUIT BREAKERS
CONTENTS
Page
TNTRODUCTTON... ....... 3
RECEIVING. HANDLING AND STOFIAGE ... 4
INSTALLATION
Location .......4
MountingTypes. ......4
Stationary Breakers . .. . 4
Drawout Breakers
General 5
NoCodeLetter(AKDSwitchgear) ....... 5
Code A (AKD-5/6 Switchgear) 7
CodeB(AKRSubstructure) ...... 8
CodeC (AKD-6Switchgear) ...,.10
Fuse Rollout Elements. .......11
Connections ....12
OPERATION
GENERAL. .....13
Manual Closing. .......13
ElectricalClosing ......13
Tripping ........14
MAINTENANCE
lnspection ......14
Lubrication .....14
Reference Publications .......15
CurrentRatingsforAuxiliaryDevices ........15
INTERCHANGEABILITY OF DRAWOUT BREAKERS .......... 16
"E-Type" Rejection ....16
PHOTOGRAPHS
AKR-2-75 (E) . 6
AKR-5-100(M) ...cover
AKR-5A-75(E) .. 7
AKR-5A-100(M) .. .. cover
Drawout substructure I
AKR-5B-75(E) ... .. cover,18
AKR-58-75(M). ........ e
AKR-5C-75(E) ... ..cover
AKR-5C-75(M). ........10
FuseRolloutElement ......11
(E) : Electrically Operated
(M) : Manually Operated
Theseins|ructionsdonotpurporttocove|a|ldetailso|variationsinequipmentnortoprovidetoreverypossib|econtingencytobemetinconnetion
maintenance'shouldfuiherin|ormationbedesirdo|shouldparticUlarprblemsaisewhicharenotcovaredsu|fcie
Genetal Electilc Company.
z

GEI-861518
INTRODUCTION
These instructions describe the installation and operation of the AKR-75 and AKR-100 frame size Low Voltage Power Circuit
Breakers. They cover a variety of models which may differ in rating, trip device andlor mounting type as indicated in Table 1.
250V. Dc
(-) This digit identifies the trip device type as follows:
2 : EC-'tB (DC onty)
4=EcS).--
s : Sdi | (50/60 Hertz only)
N : Non--automatic. ln addition, all non-automatic 250 VDc breaker types carry the suffix letter D after their frame
number, e.9., AKR-NB-7SD.
EC-18 trip devices are the electro-mechanical type. ECS and SST units are Solid State. For detailed information on these trio
devices refer to the following publications:
ECS, SST--- -------- cEt-86156
EC-1B-------- -------- cEt-86157
3
TABLE 1 BREAKER MODELS
SPECIAL DC BREAKERS FOR FIELD SWITCHING

GEt-86151 B
Before inst'alling or operating these circuit breakers, care-
fully read these instructions.
Upon receipt of a circuit breaker, immediately examine for
any damage or loss sustained in shipment. lf injury, loss or
rough handling is evident, file a damage claim at once with
the transportation company and notify the nearest General
Electric Sales Office.
Unoack the circuit breaker as soon as possible after it has
been received. Exercise care in unpacking to avoid damage
to the breaker parts. Be sure that no loose parts are missing
RECEIVING, HANDLING AND STORAGE
INSTALLATION
or left in the packaging material. Blow out any dirt or loose
particles of packaging material remaining on or in the
breaker.
lf the circuit breaker is not to be placed in service at once,
store it in a clean, dry location in an upright position. Support
it to prevent bending of the studs or damage to any of the
breaker parts. Do not cover the breaker with packing or other
material which absorbs moisture that may cause corrosion of
breaker parts. A covering of kraft or other non-absorbent
paper will prevent dust from settling on the breaker.
NOTE: Before installing in a Nuclear C/ass 7E
application, verify that this product is intended for
such use by checking the procurement records.
LOCATION
In choosing a location for the installation of these breakers
there are two factors to be considered. The first is the
location's environmental impact on the breaker. Much better
performance and longer life can be expected if the area is
clean, dry, dust-free and well ventilated. The second is con-
venience for operation and maintenance. The breaker
should be easily accessible to the operator and there should
be sufficient space available for maintenance work.
MOUNTING TYPES
AKR-75 and -100 breakers are furnished in both drawout
and stationary construction. The mounting type is identified
by the second middle digit in the breaker's nameplate desig-
nation as follows:
AKR-4(f)-75, where
(t) : mounting type code letter per Table 2
STATIONARY BREAKERS
These breakers are designed for mountlng in a switch-
board or enclosure designed and constructed by others.
Mounting consists of bolting the breaker frame to a support-
ing structure within the switchboard or enclosure, connecting
the power buses or cables, and making any necessary con-
trol connections. The front cover of the breaker enclosure
may be a hinged door or a plate bolted to the panel, including
a cut-out opening through which the front escutcheon of the
breaker can protrude.
The surface on which the breaker is mounted must be flat
to avoid internal distortion of thb breaker. The supporting
structure must be rigid enough to avoid any possibility of the
breaker studs supporting the weight of the breaker. Minimum
cutout dimensions as given by the appropriate outline draw-
ing must be maintained to provide adequate electrical clear-
ance. Connecting bus and cables must be rigidly supported
to prevent undue stress on the breaker terminals.
Outline drawing numbers giving dimensions for designing
a suitable enclosure for the stationarv AKR-75 and AKR-100
types are given below.
TABLE 2 MOUNTING TYPE CODES
AKR-75/100 (25" wide)
AKR-100 (33" wide)
TABLE 3
Stationary
Breaker
Type Breaker
widrh
Outline Drawing
Manually
Operated Electrically
Operated
AKR-( )S-75 25"
1 39C456C
AKR-( )S-100 25" 139L;4561
AKR-( )W-100 33" 1 39C456i 139C4563
4

GEr-861518
DRAWOUT BREAKERS
GENERAL
Drawout breakers are manufactured in four different
styles, identified in Table 2 by the mounting code letters
None, A, B & C. The "no-letter" models are used in General
Electric's AKD Switchgear. Code A breakers were later intro-
duced with AKD-5 Switchgear and feature closed-door draw-
out ooeration. Code B breakers provide an alternate closed-
door drawout arrangement with the stationary element
furnished as a preassembled "substructure". Code C
breakers are exclusively for AKD-6 Switchgear; they employ
the Code A drawout mechanism but have finger-type primary
studs instead of tubular. The construction and operation of
each of these drawout styles is covered under respective
headings in the following text.
As a general rule, breakers of the same drawout type,
voltage rating and ampere frame size are physically inter-
changeable. In addition, to be electrically interchangeable
with respect to secondary and control circults, they must
have duplicate wiring. The degree of interchangeability and
the mechanisms for controlling it are discussed separately
on page 1 7.
NOTE: The four drawout types are mutually non-
interchangeable; before attempting to insert a
breaker, verify that the breaker model matches the
compartment.
No CODE LETTER (AKD SWITCHGEAR) (Fig. 1)
These "no-lette/' AKR-75/'l 00 models are replacements
for their AK-75 and AK-100 predecessors in AKD switchgear.
The racking mechanism is breaker-mounted and the
breakers are bolted to a roller-mounted tray in an arrange-
ment similar to the B Type (see page 8). In addition to the
characteristics listed in Table 1, the AKD drawout has the
following unique aspects:
1. There are three (3) distinct drawout positions - CON-
NECTED, TEST and WITHDRAWN.
2. Racking travel occurs only between the CONNECTED
position and a point just short of reaching the TEST position.
3. The compartment door must be open during racking.
Breaker Insertion (AKD Type)
1. Prior to lifting a breaker to its intended compartment
location, observe the following precautions:
a. Check the compartment to insure that it is free of
foreign objects.
b. Verify that the breaker is the correct type for that
compartment.
c. Insure that the breaker ls OPEN.
d. Apply athin, fresh coat of D50HD38 lubricantto the
b re ake r's p ri m ary di scon n ects.
e. lnsure that the racking cams on the breaker are
correctly positioned for initial engagement with the
pins in the compartment. To do this, insert the rack-
ing handle and rotate it fully clockwise.
t. lf a compartment contains a keylock, it will not ac'
cept the AKR-751100 replacement breakers as re-
ceived. The AKR drawout mechanism differs from
that of its predecessor AK model, causing the AKR
breaker to mechanically interfere with the keylock
during breaker insertion. To remedy this it will be
necessary to relocate the keylock using new mount-
ing hardware included as a modification kit. So al-
tered, the compartment accepts both AK and AKR
types.
2. Using a suitable lifting mechanism and spreader rig,
position lifting hooks at the cutout notches in the top wrap-
around f rames of the breaker. Exercise care to avoid damage
to the control wiring.
3. Open the compartment.door. Keeping the rollout tray
positioned inside the compartment, raise the breaker above
the elevation of the tray.
4. Depress the test position stop lever and pull the tray all
the way out to its WITHDRAWN position.
5. Lower the breaker over the tray until it is about one-
half inch above the two dowel pins on the tray. Push the
breaker back into the comoartment until the rear bottom
flange of the breaker rests against the guides behind the
dowel oins.
6. Slowly lower and guide the breaker onto the tray so
the holes in the rear flange fit over the two dowel pins. When
correctly positioned on the dowel pins, the breaker's rear and
side bottom flanges will rest firmly on the tray.
7. Secure the breakerto the tray by inserting and tighten-
ing two-s/e inch hex-head screws into the front holes of its side
flanges.
8. lf the breaker is a manually operated type, push it into
the compartment until the TEST position stop engages,
preventing further travel. The breaker is now in the TEST
position.
lf the breaker is electrically operated, push it into the
compartment until the spring discharge stop is encountered.
Release this by depressing the "spring discharge" lever on the
bottom of the breaker (see fig. 1), then continue pushing the
breaker into the compartment until the TEST position stop
engages.
NOTE:A sprlng discharge stopwill not be presentin
some AKD-type compartments originally furnished
for electrically operated AK-75 and AK-100 breakers
of the non-quick-close type.
9. Depress the TEST position stop lever and push the
breakerfarther intothe compartment until the outersurfaces of
the racking cams butt against the racking pins in the housing.
10. Insert the racking handle (673D0500-636-05) on the
jackscrew shaft at the upper right side of the breaker. Rotate
it clockwise until the jackscrew comes to a solid stop. The
breaker is now in the CONNECTED oosition.
5

GEt-86151B
Breaker Removal (AKD Type)
1. With the door closed and latched, trip the breaker.
2. Open the door and insert the racking handle on the
jackscrew shaft. Rotate it counterclockwisi until the iack_
screw comes to a solid stop. At this point the primary discon_
nects are disengaged.
3. Now pull the breaker out of its compartment until the
test position stop engages, thereby holding the breaker in the
TEST oosition.
4. To withdraw a manually operated breaker from TESI
depressthe test position stoplever and putt tnetreaxer out of
its compartment until the tray slops. Ai this position the tray
will be fully withdrawn against its limit stop. -
The withdrawal movement for electrically operated
breakers differs from the above in that the tray is stopped
short of its WITHDRAWN limit by the compartment_mounted
.:!li!g_g]scharge sto_p. In order to comptete the withdrawat,
Il : ^.1::] !S_:p ri n g s fi.rst m ust. be .disch arged by depressin g
I.:^tl-lls dl:!n,aroq, t9ve 1 on the breaker. Next j keepi n g th ii
rever oepressed, pull the breaker completely out against the
tray limit stop' A ramp cam mounted on'tne compartment wail
Keeps rne breaker trip-free during the outward tiavel from the
TEST oosition.
5. Before proceeding with subsequent operations to re_
move the breaker from the tray, visually check the breaker,s
CHARGED-DTSCHARGED anO Opf ru_blOSf O tnOicators to
verify that the breaker is. open and the springs -re OiscnargeO.
This precaution is particularly important a"t locations where
AKR-75 and -100 breakers are being Jep-toyeO in AKD
equipments as replacements for AK_75 anO _tOb non_quick_
close electrical models;these compartments diJnot need and
were not equipped with a spring discharge stop.
6. Remove the two-s/a inch hex-head screws which fasten
the breaker to the compartment tray.
, . 7. Using care to prevent damage to the wiring, attach the
lifting device to the cutout notch"es in tfL iop *raparound
frame of the breaker.
8. Lift the breaker approximately one_half inch off the
dowel pins. Push the tray back into the compartment.
9. Swing the breaker forward until the primary discon_
nects clear the compartment. Lower the breaker onto a flat
surface free of protrusions that could damage the breaker,s
internal parts.
SPR|NG ,-,-
DISCHARGE.-.--
LEVER
RACKING
SHAFT
RACKING
CAM
TUBULAR TYPE
PRIMARY STUD
DISCONNECTS
6
Fig. 1 AKR-2-75 electricaily operated, 2-pole Dc (AKD type)

GEt-86151B
CODE A (AKD-5/6 SWITCHGEAR) (Fig. 2)
The drawout mechanism is equipment mounted and is
externally operated by a removable racking handle. The
breaker is supported bytwo pins protruding from each side of
its frame, these engaging slots in telescoping rails fastened
to the compartment walls.
The drawout ooeration features four positions - CON-
NECTED, TESI DISCONNECTED and WITHDRAWN. In
the CONNECTED position the primary and secondary dis-
connects are fully engaged. The breaker must be tripped
before it can be racked into or out of this position. ln the TEST
position the primary contacts are disconnected but the sec-
ondary contacts remain engaged. This allows complete
breaker operation without energizing the primary circuit. In
the DISCONNECTED position neither primary nor second-
ary contacts are made. Breakers can be racked between
these three positions with the compartment door closed.
Each position is clearly identified by a rotary indicator visible
through an opening in the door.
With the door open, the breaker is manually pulled out from
the DISCONNECTED to the WITHDRAWN position; here the
breaker is completely out of its compartment, ready for re-
moval.
NOTE: All electrically operated AKR-751100
breakers employ a spring discharge interlock
which prevents removal of the breaker with lfs c/os-
ing springs in the charged state. Before the
breaker can be moved away from the DISCON-
NECTED position toward the WITHDRAWN posi-
tion, it is necessary to depress and hold the
breaker-mounted spring discharge lever (Fig. 2).
This discharges the closing springs and releases
the breaker.
Manually operated breakers do not require this interlock
because their closing springs are never propped in the fully
charged position. Refer to the "Manual Closing" text on page
't3.
Breaker Insertion (Code A)
1. Prior to lifting a breaker to its intended compartment
location, observe the following precautions:
a. Check the compartment to insure that it is free of
foreign objects.
b. Verify that the breaker is the correct type for that
compartment.
c. lnsure that the breaker ls OPEN.
d. Apply a thin, fresh coat of D50HD38 lubricant to the
b reake r's p ri m ary di sconnects.
-.*4x:"*i.&,-*.*,*=." .
BREAKER
MOUNTING
PINS
117/a"
SPRING
DISCHARGE --
LEVER
7
Fig.2 AKR-5A-75 electrically operated (AKD-S, 6 type)

GEI-861518
2. With the movable inner housing of the compartment in
the CONNECTED position, insert the racking handle (part
no. 673D0500-636-05) on the jackscrew shaft located at the
left side of the compartment just above the position indicator.
3. Rotate the handle counterclockwise until the iack-
screw stops - the indicator should read DISC.
4. Remove the racking handle and open the compart-
ment door.
5. Rotate the two track-lock links and oull the rioht track
to the limit of its travel.
6. Using a lifting device, raise the breaker until the
breaker mounting pins are approximately one-inch above the
tracks. Use care to avoid damage to the breaker wiring.
7. Pull the left track out to the limit of its travel and lower
the breaker so its mounting pins drop into the slots in the
track. Remove the lifting device.
8. Push the breaker in against the track stops. On electri-
cally operated breakers, be sure to depress the spring dis-
charge lever while doing so. Rotate the two track-lock links to
lock the breaker in place. Close the compartment door.
9. Insert the racking handle on the jackscrew shaft and
rotate it clockwise to move breaker into the compartment.
Breaker is in CONNECTED position when lackscrew stops.
The indicator should read CONN.
10. Orient the lackscrew so that its slotted sleeve is free to
move outward, otherwise the breaker will remain trip-free.
Breaker Removal (Code A)
1 . Trip the breaker. Insert the racking handle into the jack-
screw shaft.
2. Rotate the handle counterclockwise untilthe iackscrew
stops. Indicator should read DISC.
3. Remove the racking handle and open the compartment
door.
4. Rotate the two track-lock links and pull the breaker out
to the track travel limit. This is the WITHDRAWN position. lf
the breaker is electrically operated, the breaker-mounted
Spring Discharge lever must be depressed to permit with-
drawal.
NOTE: Spring discharge interlocks were not re-
quired and are not present in existing compart-
ments originally furnished for non-quick-close type
electrically operated AK-751 1 00 breakers. Regard-
/ess of whether this interlocking hardware is
present in a compartment, ALWAYS verify that the
closing spnngs are discharged and the breaker is
tripped OPEN before removal is attempted.
Fig.3 AKR drawout substructure
Cat. No. TAK8SS02
3200 amperes
5. Attach lifting hooks at the cutouts in the top wrap-
around frame and raise the breaker until its mounting pins
clear the track slots.
6. Push the tracks into the compartment so that the
breaker can be lowered to a smooth surface free of protru-
sions that could damage the internal parts of the breaker.
CODE B (AKR SUBSTRUCTURE) (Figs.3,4)
The AKR substructure is a self-contained, open-type
framework serving as the stationary receptacle for a drawout
breaker. Featuring closed-door type drawout operation, it is
designed for convenient mounting in individual breaker com-
partments of drawout switchgear equipments. lt provides
means for making the primary and secondary connections to
the removable breaker element and is factory aligned.
The breakers are bolted to a roller-mounted tray which is
part of the substructure. The racking mechanism is breaker-
mounted. The racking handle is inserted through the com-
partment door and acts to rotate slotted racking cams on
each slde of the breaker frame. The cams engage fixed pins
mounted on both side plates of the substructure, moving the
breaker in and out through the same four positions described
for the Code A Types - CONNECTED, TEST, DISCON-
NECTED, WITHDRAWN. Breaker position is registered di-
rectly by markings on the right side of the escutcheon which
appear as it emerges through the door cutout.
All AKR B breakers for use in substructures are equipped
with a "deep" escutcheon instead of the standard escut-
cheon employed on all oiher models. This configuration al-
lows the breaker to be racked between the CONNECTED
and DISCONNECTED oositions with the door closed. The
door does not move with the breaker as it does in the AKD-S
and AKD-6 models.
$
'$
]$
$.
'e
i:
$
*
8

GEI-86151 B
Breaker Insertion (Code B)
1. Prior to lifting a breaker to its intended compartment
location, observe the following precautions:
a. Check the compartment to insure that it is free ot
foreign objects.
b. Verify that the breaker is the correct type for that
compartment.
c. lnsure that the breaker is OPFN.
d. Apply a thin, fresh coat of D50HD38 lubricant to the
b reake r's p rim ary discon nects.
e. lnsure that the racking cams on the breaker are
correctly positioned for initial engagement with the
pins in the compartment. To do this, insert the rack-
ing handle and rotate it fully counterclockwise.
2. Using a suitable lifting mechanism and spreader rig,
position lifting hooks at the cutout notches in the top wrap-
around frames of the breaker. Exercise care to avoid damage
to the control wiring.
3. Open the compartment door. Keeping the rollout tray
positioned inside the compartment, raise the breaker above
the elevation of the tray.
4. Pull the tray all the way out to its WITHDRAWN limit.
5. Lower the breaker over the tray until it is about one-half
inch above the two dowel pins on the tray. Push the breaker
back into the compartment untilthe rear bottom flange of the
breaker rests against the guides behind the dowel pins.
6. Slowly lower and guide the breaker onto the tray so the
holes in the rear flange fit over the two dowel pins. When
correctly positioned on the dowel pins, the breaker's rear and
side bottom flanges will rest firmly on the tray.
7. Secure the breaker to the tray by inserting and tighten-
ing two-3/a inch hex head screws into the front holes of its side
flanges.
8. Push the breaker into the compartment until the spring
discharge stop engages, preventing further movement. This
is the DISCONNECTED position. At this point the racking
cams are positioned to engage the lixed racking pins in the
compartment, ready to begin the racking motion.
It is to be noted that manually operated breaker models do
not employ a spring discharge interlock. lt is unnecessary
because their operating mechanism never statically posi-
tions the springs in a fully-charged state. However, to provide
necessary means for mechanically securing the breaker in
the DISCONNECTED position, a position stop is employed.
It has a release lever marked "Push to Withdraw" and is
located in the same place as the spring discharge release
lever on electrically operated breakers - see Fig. 4.
:wt x,
FINGER-TYPE
PRIMARY
DISCONNECTS
t'
N
r rt{
''f
..PUSH TO WITHDRAW''
RELEASE LEVER
\
9
Fig.4 AKR-58-75 manually operated (substructure type)

GEI-861518
9. Close the compartment door. Insert the racking handle
(part no. 5688731G1) through the opening at the upper right
of the door and onto the jackscrew shaft. By rotating the
handle clockwise, move the breaker through the TEST posi-
tion into the CONNECTED position; the latter is indicated
when the jackscrew comes to a solid stop. All three positions
- DISCONNECTED, TEST and CONNECTED - are in-
dexed on the right side of the breaker escutcheon.
Breaker Removal (Code B)
1. With the door closed and latched. trio the breaker.
2. Insert the racking handle and rotate it counterclockwise
untilthe breakertravels from CONNECTED through TEST to
the DISCONNECTED position, as indicated bythe jackscrew
coming to a solid stop. This operation should be performed
with the door closed.
3. Open the door. On electrically operated breakers, de-
press the Spring Discharge lever to discharge the breaker's
closing springs. While holding this lever depressed, pull the
breaker all the way out to its WITHDRAWN position.
On manually operated breakers this release lever is la-
beled "Push to Withdraw". See Par. 8 on previous page.
4. Before proceeding with subsequent operations to re-
move the breaker from the compartment, visually check the
breaker's spring charge and close indicators to verify that the
breaker is open and the springs are discharged.
5. Remove the two-g/e inch hex head screws which fasten
the breaker to the compartment tray.
6. Attach the lifting device to the cutout notches in the top
wraparound frame of the breaker, using care to prevent dam-
age to the wiring.
7. Lift the breaker approximately one-half inch off the
dowel pins. Push the tray back into the compartment.
8. Swing the breaker forward until the primary discon-
nects clear the comoartment. Lower the breaker onto a flat
surface free of protrusions that could damage the breaker's
internal oarts.
CODE c (AKD-6 SWITCHGEAR) (Fig. s)
These breakers employ the same drawout arrangement as
the Code A models described on page 7. Their drawout
operation and breaker insertion/removal procedures are
identical, but they differ significantly in other aspects. As
indicated in Table 1, the AKR-( )C-75 is a 32004 Ac frame
size compared to the 3000A A model. The AKR-( )C-100 is
narrower than AKR-( )A-100 (25 versus 33 inches). All C
models employ finger-type primary disconnects instead of
the tubular studs of the A types per fig. 2.
C breakers cannot be employed as replacements for A
types due to their width and primary disconnect configura-
tion.
"'se! ._ r ,
;t- t. IBREAKER
MOUNTING
PINS
$ r,rl
Y.".,
1 011/r o
10
Fig. 5 AKR-5C-75 manually operated (AKD-6 type)

GEr-86151 B
FUSE ROLLOUT ELEMENTS
When the system available short circuit current exceeds
the rating of an AKR-75 or -100 breaker, current limiting fuses
can be used in series with the breaker to increase the short
circuit rating of the combination. When used, such fuses are
housed in a separate drawout compartment located adjacent
to the breaker compartment; they are mounted on a drawout
carriage similar to a breaker frame and referred to as a fuse
rollout element (FRO). A typical model is shown in Fig. 6.
As listed in Table 4, these FRO's are available in four
drawout styles, each employing the same type drawout
mechanism as its companion breaker. The FRO is racked
into and out of its compartment just like a breaker. However,
the fuse and breaker compartments each are equipped with
keylocks to prevent racking the FRO when its associated
breaker is closed.
All FRO models except the AKD type feature a hinged,
oerforated steel screen in front of the fuses. This panel can
*"S
be opened to allow access to the fuses only when the FRO is
in the WITHDRAWN oosition. In all other oositions an inter-
ference angle attached to its left side prevents the panel from
being opened.
Unlike the other three types, AKD fuse rollouts do not
employ a screen in front of the fuses. lnstead of acting
directly on the racking mechanism, the keylock is arranged to
prevent inadvertent opening of the compartment door. So
long as the breaker is closed, the FRO compartment door
cannot be opened. lf the breaker is open, the key can be
removed and inserted in the FRO compartment lock; the
FRO compartment door then can be opened and the element
racked at will.
Operation of the breakercompartment keylock is the same
for all models. With the breaker open, the key can be re-
moved; this extends the lock bolt, thereby maintaining the
breaker in a trip free state while in the CONNECTED oosi-
tion. The breaker can be racked at will reoardless of the
keylock position.
TABLE 4 FUSE ROLLOUT ELEMENTS - 600VAc. 50/60 Hz.
11
4. t ,$
tr.. $ $
i\:
{,t "x
tt.'. ', '
\.-i:.J
\$$
Fig. 6 Fuse rollout element TAK94FCA (AKD-S, 6 type)

GEt-861518
CONNECTIONS
In all electrical connections good joint conductivity is a
must. When making power connections to stationarv
breakers, the mating joint surfaces must be clean and nave i
smooth fnish. They should be parallel and firmly bolted or
clamped together. In addition, the bus or cable conductors
must have ample ampacity to prevent overheating.
Control Connections
The outgoing connections to a breaker,s accessories and
control devices must be in accordance with the specific wir_
ing diagram applicable to that breaker.
TERMINAL BOARD
MOUNTED ON FRONT
OF BHEAKER AT
UPPER LEFT
CUSTOMER
CONNECTIONS
---REVERSE
CURRENT
DEVICE
POTENTIAL
SOURCE
Fig.7 Gontrol connections to stationary breakers _ front view.
76543
E
7654321
Lq$loooooo
1234567a9rc
Control connections to stationary breakers are made to a
terminal board mounted on.the breaker. Figure 7 shows
typical closing and tripping connections. lf equipped with an
overcurrent trip device which includes a ground fault element
for use on 4-wire circuits, an additionil terminal board is
provided on the breaker for connecting to the equipment-,
mounted neutral sensor (physically located in the neutral
conductor). '/
On drawout breakers the control circuits terminate in the
breaker compartment on the stationary portion of separable
secondary disconnects - see fig. g.
AUX. SW
CONTACT
i
.\
I I FUSE
t
(+)
TO
"a"
-r-J l_\,-J
CLOSING TRIP
SOURCE SOURCE
STATIONARY SECONDARY DISCONNECT BLOCKS
LOCATED AT TOP OF COMPARTMENT _
POSITIONS B AND C FURNISHED
ONLY WHEN REOUIRED
I -rr-r.r-
'J,lS' {['"'+fl]H '"'l ".or,*n
,r,J 'o'*
7654321
A
nAnnnnn nnnAnAn
12
Fig. 8 Control connections to drawout breakers - front view of breaker compartment.

GEI-86151 B
OPERATION
GENERAL
The AKR-75 and AKR'100 breakers are closed by the
discharging of the energy stored in the closing springs of the
breaker. As the closing springs are discharged, the energy is
directed into the closing cam of the breaker which causes the
moveable breaker contacts to be forced against the station-
ary contacts, and, at the same time causes the opening
springs to be charged so they may open the breaker during a
subsequent opening operation.
MANUAL CLOSING
Manually operated breakers are equipped with a handle
whlch extends from the escutcheon of the breaker. Alter-
nately rotating the closing handle counterclockwise then
clockwise through approximately 120 degrees of rotation
through four complete cycles will cause the breaker to close.
During the four counterclockwise movements and the first
three clockwise movements of the handle, the springs are
progressively charged. After approximately seven degrees
travel of the fourth clockwise handle movement, the spring
charge mechanism is driven "over center" and the energy
stbred in the closing springs is directed into the closing cam
and causes the breaker to close. A charge-indicator, num-
bered one to four, visible through the breaker escutcheon.
indicates the number of comolete handle movements that
have been oerformed.
r--
I
x lI--
I
ELECTRICAL CLOSING
On electrically operated breakers the closing springs are
charged by a gear motor. With the springs discharged, volt-
age applied to the control circuit will energize the motor
through the "G" switch contacts - see fig. 9. The motor,
through the gear reduction output crank, compresses lhe
closing springs until they are fully charged. As this fully
charged position is reached, mechanically operated
switches "F" and "G" reverse their shown position, the "G"
switch deenergizlng the motor and the "F" switch establish-
ing a circuit to the "X" relay. At the same time, a mechanical
prop is positioned to prevent the discharge of the fully
charged closing spring.
With the closing spring propped fully-charged, the breaker
is ready for closing. This may be accomplished electrically by
depressing the closing switch on the breaker (if so equipped)
or by a remote closing switch. Operation of the closing switch
energizes the "X" relay, which in turn energizes the closing
solenoid. This removes the prop, releasing the closing
springs to close the breaker.
As the closing relay is energized, it energizes anti-pump
relay "W". lf the closing switch is maintained closed, the anti-
pump relay will remain picked-up to prevent a second closing
operation on the breaker in the event it is tripped open
automatically. The closing impulse must be released and
reapplied before a second closing operation can occur.
LEGEND
CC_CLOSING SOLENOID
F - CUTOFF SWITCH, CLOSED
WHEN CLOSING SPRING IS
FULLY CHARGED.
G _CUTOFF SWITCH. OPEN WHEN
CLOSING SPRING IS
FULLY CHARGED.
L _AUXILIARY SWITCH
M _CHARGING MOTOR
PB_CLOSE PUSHBUTTON ON
BREAKEB ESCUTCHEON,
OPTIONAL.
TC _ SHUNT TRIP DEVICE
W_ANTI-PUMP RELAY
X_CONTROL RELAY
t
,{,1
T_
I
I
I
CONTROL
SOURCE
-1T
"lI
1J
F
H:
r''
I
I
I
i"
F-
-'lI
FlI
J
Fig. 9 Elementary diagram for electricaily operated drawout breaker.
contact positions are shown with breaker open and closing springs discharged.
13

GEt-861518
TRIPPING
In the closed position, the breaker's movable contacts are
held in by a toggle linkage. The breaker is tripped open by
displacing a mechanism latch which allows this toggle link-
age to collapse. The trip latch is rigidly fastened to a horizon-
tal trip shaft running from left to right through the breaker. In
turn, the trip shaft carries paddles actuated by the manual trip
button and the various other trip devices - overcurrent,
reverse current, shunt trip, undervoltage, open fuse lockout.
Viewing the breaker from the right, rotating the trip shaft
counterclockwise trips the breaker; clockwise movement re-
sets the mechanism latch.
In addition to tripping the breaker, some devices hold the
breaker trip free, i.e., prevent the contacts from closing even
though a closing impulse is applied to the mechanism. Such
devices are the undervoltage, bell alarm and lockout, electric
lockout, open fuse lockout, and the key operated locks.
These devices and the drawout mechanism interlocks must
be in the reset position before the breaker can be closed.
Breakers employed in conjunction with fuse rollout ele-
ments should be equipped with an open fuse lockout device
(OFLO). This OFLO is a special trip device having three (3)
shunt trip elements (one per phase), the coil of each being
connected across its corresponding fuse in the fuse rollout
unit. Connections are made via the C secondary disconnect
block on the breaker thru the B secondarv disconnect block
on the fuse rollout unit.
The arc voltage generated by a blown fuse activates its
OFLO shunt trip coil, thereby tripping the breaker and pre-
venting single phase power from being supplied to the load.
An indicator on the OFLO device signals which fuse is blown.
The breaker cannot be closed until the blown fuse is ac-
knowledged by resetting the OFLO, and presumably replac-
ino the blown fuse.
MAINTENANCE
INSPECTION
Periodic inspection of the circuit breaker is recommended
at least once a year. More frequent inspections are recom-
mended where severe load conditions, dust, moisture or
other unfavorable conditions exist, or if the vital nature of the
load warrants it.
Always inspect the breaker after a short-circuit current has
been interrupted.
At the time of inspection, the following checks should be
made after the breaker has been deenergized:
1. Manually operate the breaker several times, checking
for obstructions or excessive friction. Manual closing of an
electrically operated breaker may be performed by the fol-
lowing two steps:
(1) Install maintenance crank (5688386G1) to the motor
gear reducer shaft on the front right side of the breaker.
Ratchetthe maintenance crank up and down untilthe springs
are fully charged as indicated by the distinct click as the prop
is set and prevents any further charging of the closing
springs. After the prop is set do not apply undue force to the
maintenance handle.
(2) Depress the "Spring Discharge" lever located under
the horizontal support on the front frame. The springs should
discharge and if the latch is properly reset, the breaker will
close.
2. Electrically operate the breaker several times to check
performance of the electrical accessories.
3. Visually check the breaker for loose hardware on the
breaker and the bottom of the comoartment for anv hardware
that has fallen from the breaker.
4. Remove the arc quenchers and inspect the arc
quenchers and contacts for breakage or excessive burning.
5. The performance of the solid-state current trip devices
may be checked with a suitable test set. Check electrome-
chanical devices for positive trip in accordance with the in-
structions in Maintenance Manual.
6. Check insulating parts for evidence of overheating and
for cracks that indicate excessive thermal aoino.
LUBRICATION
In general, the circuit breaker requires moderate lubrica-
tion. Bearing points and sliding surfaces should be lubricated
at the regular inspection periods with a thin film of GE Lubri-
cant D50HD38 (Mobil 28). Before lubricating, remove any
hardened grease and dirt from latch and bearing surfaces
with kerosene. ALL EXCESS LUBRICANT SHOULD BE RE-
MOVED WITH A CLEAN CLOTFI TO AVOID ACCUMULA-
TION OF DIRT OR DUST.
On drawout breakers the contact surface of the disconnect
studs should be cleaned and qreased with GE Lubricant
D50HD38,
14

GEr-861518
REFERENCE PUBLICATIONS
These instructions provide information of a general nature
on the installation and operation of Type AKR power circuit
breakers. For more detailed information such as might be
needed for overhauling, trouble shooting or replacing parts of
the breaker, refer to the following instruction manuals applica-
ble to the AKR-75 and AKR-100 breakers.
Maintenance Manual GEK-64460
Renewal Parts. .... GEF-4552
ECS and SSTTrip Devices . . GEI-86156
ECTripDevices .'.. GEI-86157
ECSiSSTTeSt Sets:
CaI.TAK-TS1 .... GEK-64454
CaI.TAK-TS2 .... cEK-73300-1
High-Cunent Testing of AKR
BreakerswithECS/SST..... ... GEK-64455
TABLE 5. CURRENT RATINGS FOR AUXILIARY DEVICES
Type Load or P.F.
Voltage Interrupting Rating
Nominal Range Auxiliary
Switch Bell Alarm
Switch
Resistance
48 dc 38-56 25.00
125 dc 1 00-1 40 11.00 2.5
250 dc 200-280 2.O0 0.9
600 dc 508-672 0.45 0.3
Electro-Magnet 48 dc 38-56 15.00
125 dc 1 00-1 40 6.25 2.5
250 dc 200-280 1.75 0.9
600 dc 508-672 0.35 0.3
75-85"/" Lagging 120 ac 104-127 75.0 30.0
240 ac 208-254 50.0 15.0
480 ac 41 6-508 25.0 7.0
600 ac 520-635 12.O 5.0
30-35% Lagging 120 ac 104-127 50.0 30.0
24O ac 2Q8-254 25.0 15.0
480 ac 41 6-508 12.0 7.O
600 ac 520-635 8.0 5.0
30-35"/o PF or resistive
-On drawout breakers, limited to the 5 ampere continuous rating of #16 gage wire.
15

GEI-86151 B
INTERCHANGEABILITY OF DRAWOUT BREAKERS
GENERAL
Low-voltage switchgear practice requires that drawout
breaker elements of the same ampere frame size be physi-
cally interchangeable. Electrical interchangeability of sec-
ondary and control circuits, of course, requires duplicate
wiring. The four drawout styles (AKD, A, B & C) of the AKF-75
and -100 models satisfy this requirement in varying degree.
The B and C types, being of more recent design, limit inter-
changeability within a given frame size to those units having
the same voltage rating; rejection of unwanted types thus is
more selective than that of the earlier AKD and AKD-S
models. The individual interchangeability patterns are illus-
trated in Fig. 10.
Because the AKR-75/100 B and C models are identical in
height and width, each includes means to prevent inadvertent
interchange of these 3200 and 4000 ampere sizes. This is done
by adding interference hardware to each breaker and its
compartment, causing the compartment to accept the correct
breaker type and reject all others.
Rejection means are not required on the AKD and Code A
breakers; the -100 frame is wider than the -75, making them
inherently non-interchangeable.
NO.LETTER AKD TYPES
As the Fig. 10 directional arrows indicate, all AKD ele-
ments are interchangeable within each frame size.
Considering that the AKR-75 AKD and B type breaker
models are identical in width and employ very similar drawout
mechanisms, rejection plates are added to the AKD AKR-75
modelsto preventtheir insertion into Btype substructures. See
Fig. 11.
CODE A TYPES
Interchangeability is identical to that of the AKD type.
CODE B TYPES
Interchangeability within and between frame sizes is pre-
vented by the rejection system of Fig, 13. Variously posi-
tioned pins on the drawout tray must align with matching
holes and notches in rejection plates bolted to the breaker's
bottom flanges. An incorrect style breaker presents a mis-
match and will not seat on the tray.
Becaus:tthe B-type drawoutmechanism is nearly identical
to.the AKD type, all B elements include additionat means to
rejectthemfrom AKD compa.rtments, e,n iiiigger Oracfueti
attached to the riqht edoe of the re"rlr"r;;l;""r.h B breaker
per Fis. 1 2. rh is interfe;es with th;;";; ;;; o'iine risnt warr
of the AKD compartment ".d ;;;;;;i:;iffi the B unit.
CODE C TYPES
All C elements are unique and non-interchangeable within
and between frame sizes. This is accomplished by the rejec-
tion hardware system of Fig. 14. Variously positioned inter-
ference pins on the rollout tracks cooperate with notched
brackets fastened to the breaker's side plates. When inser-
tion of the wrong breaker is attempted, the pins and notches
do not align, thereby preventing the breaker f rom seating into
the track slots.
C elements employ the A-type drawout mechanism, but in
modified form to prevent interchangeability with the A units.
The modification spaces the breaker's right side mounting
pins on shorter centers (10-1 1/16) than those on the left side
(11-718). See Fig. 10.
..E.TYPE' REJECTION
Some installations require that breakers serving essential
circuits be segregated from identical models deployed else-
where in the power system. The segregation is physical and
is accomplished by supplemental rejection hardware added
to the breaker and its drawout compartment.
In this publication these special category breakers are
designated as "E-type". They are interchangeable as fol-
rows:. E-type compartments reject standard breakers.
o Standard compartments accept E-type breakers.
E-type rejection is an optional feature available on B and C
code breakers only.
On Code B breakers, the E-type rejection feature is pro-
vided via an extra hole in each bottom flange engaging corre-
sponding pins added to the drawout tray. See Fig. 15.
On Code C breakers, E-type rejection is achieved by
notching the breaker's right side plate to clear a special
rejection pin added to the right slide rail. See Fig. 16.
All E-type breakers have the suffix letter E added to the
middle digits of their designation as shown by the following
example: AKR-4BE-75.
16

GEI-861518
DRAWOUT BREAKERS
RACKING
CAM
AKD
(No code letter) ts-25"-l I FRONr
-oF
BREAKER
+
AKD.s, AKD.6
1 1z/a"
I
T
1 17/e"
l_
T
I
1 17/e"
T
F- zs,,_+l
F_ss,,---t
code @I
1 17/e"
T
BREAKER MOUNTING PINS
AKR
SUBSTRUCTURES Deeo Escutcheon
coce@ T6t
,*r ,
AKD.6 T ^*^ l{ ,;,1 r^.'** Ir i,,,u,,
il 3200A. F _il 3200A. F__
.----.----t_ ,lr:4 |
cocre @H--H -lt-'il '
I AKR-100 | ttrt^,, I TAKg4FCC | 1Qt1lte"
,{ 'g1-F -ll oo* F-l
l+-25 ----rl
Fig. 10 Drawout breaker interchangeability chart, plan view- All breaker units joined by +r> fit the same
compartment. All others have unique mounting and are not interchangeable.
17

GEr-86151B
SIDE
PLATE
E.
IJJ
Y
UJ
(I
d)
t!
o
F
z
IL
I
.t.
I
BOTTOM
FLANGE
PLAN VIEW
Fig. 11 Rejection hardware on AKR-75 AKD type units to
prevent insertion into B-type substructures.
,jis
,s
is
i;t
is
[..,..
REJECTION BRACKET _
INTERFERES WITH
RAMP CAM ON
SIDE WALL OF
AKD COMPARTMENT
Fig. 1 2 Reiection means on AKR-75/1 00 code B type drawout breakers to exclude them from AKD type compartments.
18

GEI-861518
FUSE
ROLLOUT
ELEMENTS
600VAc
rffi-,-frp
,ilrc:$r
Eilbtr'4 ll
rrt2 Sil
.e @
3200A.
TAKS3FCB
@
4000A.
TAKg4FCB
AKR.I OO
1-Breaker side plate
2-Bottom flange of side plate
3-Rejection plate
4-3/8" diam. pin in drawout tray
5-V2" diam. pin in drawout tray
G-Clearance hole in plate and flange
7-Breaker mounting bolt hole
Fig.13 Rejection hardware on AKR-75/100 Code B type drawout breaker elements. Plan views.
AKR-75
19

GEt-86151 B
250VDc 500VDc
F'*-l I
tM
l+++l
FJ
LP5
I l-r.oeJ
'+ApL
l$+ $l
E-
ftEJEC']ON SRACK€T
iON:$IDE PTATE
AKR.7-5
,' ,t.'
l*zrz-l I
tue
vrL
q# I F'**l
+@€L
14+ +l
I_pz
1( J,&l
PrNrN ..^t tf
SLIDE\ r'rz lHi I
^^',rv-e
J4 t9+91
I r.oo l*-
BREAKER MOUNTING PIN
| \ F'*l
+A{qrii
r rzk-J I
&a
l*++l
E-
l.-z.re --l
@{
lT+ 41
G_
+
20
Fig' 14 Reiection hardware on AKR-75/100 code c type drawout breaker elements - side views.