GE AKR-5-100 User manual

'---- GEl-86151-C
lnstallation
Manual
(~' ) 8
Low VOitage
PowerCircuit
Breakers
J Types AKR-75/100
('
AKR-5-100 AKR-5A-100
Manuallyoperated, AKO
type Manuallyoperated, AKD-5 type
AKR-58-75 AKR-5C-75
Electri
cally operated, substructure type
Electricallyoperated, AKD-6 type
G ENER AL fj EL E CT R IC
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- I
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.,
Installation and Operation
of Type AKR-75 and
AKR-100 Low-Voltage
Power Circuit Breakers
CONTENTS
SECTION 1 SECTION 6
1.0 INTRODUCTION 3 6.0 FUSE ROLLOUT ELEMENTS
SECTION 7
SECTION 2 7.0 CONNECTIONS
2.0 RECEIVING, HANDLING 7.1 Primary Power
AND STORAGE 4
7.2 Secondary Control
SECTION 3 SECTION 8
3.0 INSTALLATION 4 8.0 OPERATION
3.1 Class 1E Application
4 8.1 General
3.2 L ocation 4
8.2 Manual Clos ing
3.3 Mounting Types 4
8.3 El ectrica l Closing
8.4 Tripping
SECTION 4
8.5 Current R ating F or
Auxiliary Devices
4.0 STATIONARY BREAKERS 5 SECTION 9
SECTION 5 9.0 MAINTENANCE
5.0 DRAWOUT BREAKERS 9.1
In spection
5
9.2 Lubrication
5.1 General 6
9.3 Reference Publications
5.2 No Code Letter -AKO S wit chgear 6
5.2.1 BreakerInserti
on 6 SECTION 10
5.2.2 Breaker Removal 7 10.0 INTERCHANGEABILITY
OF
5.3 Code A -AKD 5/6 Swi tchge ar
8 DRAWOUT BREAKERS
5.3.1 Breaker Insertion
8 10.1 General
5.3.2 Breaker Removal 8 10.2
No Letter AKDTypes
5.4Code B· AKR Substructure
8 10.3 CodeA Types
5.4.1 Breaker Insertion 10
10 .4 Code B Types
5.4.2 Breaker Removal
11 1 0.5 Code CTypes
5.5 Code C. AKO 6 Switchgear
11 1 0.6 Code DTypes
5.6 Code D -AKO 8 Switchgear
11 10 .7 Code F Types
5.7 Code F · AKR Su bstructure
11
10.8 8 E -Type Rejection
13
14
14
14
15
15
15
15
16
16
17
17
17
17
18
19
19
19
19
19
19
19
19
2
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I
SECTION 1
Introduction
These instructions describethe installation and operation
of the AKR-75 and AKR-100 frame size LowVoltage Power
Circuit Breakers. They cover a variety of models which may
differin rating, trip device and/ormountingtype as indicated
in Table
1.
Table 1
FRAME SIZE MOUNTING TYPE
(Amperes) BREAKER
600V. Ac DESIGNATION ORAWOUT
Sub-
250V. De 50/60
Hz.
AKO AK~S
AK~ AKD-8
Structure
3000 AKR-{•)-75 x
4000 AKR-(")A-75 x x
AKR-(*)B-75 x
3200 AKR-(")C-75 x
AKR-(*}D-75 x
AKR-(•)F-75 x
AKR-{")S-75
AKR-(*)-100 x
AKR-(*)A-100 x x
AKR-(*}B-100 x
6000 4000 AKR-("')C-100 x
AKR-(*)D-100 x
AKR-(•)F-100 x
AKR-(*)S-100
AKR-(*)W-100
DEEP
Stat.ionary ESCUTCHEON
x
x
x
x
x
x
x
x
x
x
SPECIAL DC BREAKERS FOR FIELD SWITCHING
ARK-N-75F x
AKR-NB-75F x x
4000 AKR-ND-75F x x
AKR-NF-75F x x
AKR-NS-75F x
AKR-N-100F x
AKR-NB-100F x x
6000 AKR-ND-100F x x
AKR-NF-100F x x
AKR-NS-100F x
AKR-NW-1 OOF x
PRIMARY
STUD
TYPE
Bar
Tube
Tube
Fingers
Fingers
Fingers
Fingers
Bar
Tube
Tube
Fingers
Fingers
Fingers
Fingers
Bar
Bar
Tube
Fingers
Fingers
Fingers
Bar
Tube
Fingers
Fingers
Fingers
Bar
Bar
Example: AKR-5B-75 identifies a drawout, substructure-mounted breaker equipped with the SST trip device.
The
EC trip devices are electro-mechanical, refer to GEi 86157 for detailed information.
BREAKER MODELS
(*) This digit identifies
the trip device:
2 =
EC-1 or EC-2A. De only.
4 = ECS
5 = SST 50/60 Hertz only.
6 = Micro Versa Trip 50 / 60 Hertz only.
For detailed information
on
these trip devices refer to the
following publication:
GEl-86157
3
N = Non-automatic.
In addition, all
non-automatic 250V.
De breaker types carry the
suffix letter D after the
frame number,
e.g., AKR-NB-750.
/
\. :. ·.
BREAKER
WIDTH
(Inches)
25
33
25
3~
25
33
25
33
•
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SECTION 2
Receiving, Handling,
and Storage
Before installing or operating these circuit breakers, care-
fully read these instructions.
Upon receipt ota circuitbreaker, immediately examine for
any damage or loss sustained in shipment. If 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.
Unpack the circuitbreaker as soon aspossible after it has
been received. Exercise care
in unpacking to avoid damage
to the breaker parts. Be sure that no looseparts are missing
or left
in the packaging material. Blow out any dir! or loose
particles
of packagi ng material remaining on or in the
breaker.
If the circuit breaker is not to
be placed in servi ce at once,
store it
in a clean, dry location in an uprig ht position. Support
it to prevent bendi
ng of the studs or damage to any of the
breakerparts. Do not coverthe breakerwith
pa cking orother
materialwhich absorbs
mo isturethat maycausecorrosion of
breaker parts. A covering of kraft or oth er non-absorbent
paper wi
ll prevent dust from sett li ng on the breake r.
SECTION 3
Installation
3.1 CLASS 1E APPLICATION
NOTE : Before installing in a Nuclear Class 1E
appl ic ation, v eri fy that this product is intended for
suchuse
by checkingthe procurementrecords.
3.2 LOCATION
In choosing alocation for the installation of these breakers
there are two factors to be considered. The first is the
location's environmental impact onthe breaker. Much better
performance and longer life can be expected if the area is
clean, dr
y, dust·free and well ventilated. The second is con-
venience for operation and maintenance. The breaker
should be easily accessible
to the operatorand there should
be sufficie
nt space available for maintenance work.
3.3 MOUNTING TYPES
AK A- 75 and -1 00 brea ke rs are furnished in both drawout
and stationa
ry construction. The mounti ng type is identified
by the second middle digitin the break
er 's nameplatedesig-
na tion as follow s:
AKR-4(t )-75, where
( t) = mounting type code letter per Table 2
TABLE 2 MOUNTING TYPE CODES
Code
Breaker Type
Letter Drawout Stationary
None AKO
---
A AKD-5, 6
---
B Substructure
---
c AKD-6 Only
---
D AKD-8
---
F Substructure
---
s
---
AKA· 7 51 100(25" wide)
w
---
AKR-100 {33" wide)
4
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SECTION 4
Stationary Breakers
These breakers are designed for mounting in a switch-
board
or enclosure designed and constructed by others.
Mounting consists
of bolting thebreaker frame to a support-
ingstructurewithin theswitchboardorenclosure,connecting
the power buses orcables, and making any necessary con-
trol connections. The front cover
of the break er enclosure
maybe ahingeddoor oraplate 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 the breaker. The supporting
structure mustbe rigid enough
lo avoidany possibility of the
breakerstuds supportingtheweight
of thebreaker. Minimum
cutout dimensions as given by the appropriate outline draw-
ing mustbe 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 dimensionsfor designing
a suitable enclosure for the stationaryAKR-75 and AKR-100
types are given below.
TABLE 3
Stationary Outline Drawing
Breaker Breaker
Manually Electrically
Type Width Operated Operated
AKR-( )S-75 25"
AKR-( )S-100 25" 139C4560 139C4561
AKR-(
)W-1 00 33" 139C4562 139C4563
5
SECTION 5
Drawout Breakers
5.1 General
5.2 No Code Letter-AKO Switchgear
5.2.1 BreakerInsertion
5.2.2 Breaker Removal
5.3 Code A -AKO 5/6
Switchgear
5.3.1 BreakerInsertion
5.3.2 Breaker Removal
5.4 Code B-AKRSubstructure
5.4.1 BreakerInsertion
5.4.2 Breaker Removal
5.5 CodeC -AKO 6
Switchgear
5.6 Code 0 -AKO 8 Switchgear
5.7 Code F - AKR Substructure
6
6
6
7
8
8
9
9
10
11
11
11
11
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Drawout Breakers
5.1 GENERAL
Drawout breakersare manufactured in six different styles,
identified in Table2 bythemounting codelettersNone,
A, 8,
C, D& F. The"no-letter"models areusedin GeneralElectri e's
AKDSwitchgear. CodeAbreakerswerelaterintroducedwilti
AKD-5 Switchgear and feature closed-door drawout opera·
tion.Code
Band Fbreakers provideanalternateclosed-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 in-
stead
of tubular. Code D breakers were introduced wilti lhe
AKD-8 Switchgear and feature the Code 8 closed-door
drawoutmechanism.The construction andoperation of each
of these drawoutstyles is covered underrespectiveheadings
in the following text.
NOTE: The Code Band Code Fdrawout t)pesare
mutually interchangeable.
The " no -letter ," Code A.
Code C and Code D drawout types are mutually
noninterchangeable. Before attempting to insert a
breaker, verily that the breaker model matches the
compartment.
The Code B, D,and F breakers areidentical exceptfor lhe
following:
a. Position indication label.This label is mounted
on the
sides of the breaker's deepescutcheonand indicates
the DISCONNECTED, TEST, and CONNECTED posi-
tions.The Code D breaker label ind
ic ates the proper
position only inAKD 8 switchgear. The Code
Band F
breakerIabels indicateproperly onlyinAKR
Su bstru c-
tures.
b. Trip device. Code D and F breakers are factory sup-
plied with Micro-Versa
Tr ip programmers. Code B
breakersaresupplied
with SST or ECS programmers.
(A SST/ECS to
Mic ro-Versa Trip conversion kit is
available).
c. Appearance. Code D and F breake
rs use a different
color scheme on their deep escutcheons and labels.
Also,theyhavea differentlyshaped manual operating
hand
le .
5.2 NO CODE LETTER (AKO SWITCHGEAR)
(Fig. 1)
These "no-letter" AKR-75/100 models are replacements
fortheir
AK -75and AK-100 predecessors inAKD switchgear.
The racking mechanism is breaker-mounted and the
breakers are bolted to a roller-mounted tray in an arrange-
mentsimilarto the BType(see Section 5.4). Inaddition
to the
characteristics
lis ted in Table 1, the AKD drawout has the
following unique aspects:
1. There are three (3) distinctdrawout positions-CON-
NECTED, TEST and WITHDRAWN.
2.. Racking travel occurs only between the CONNECTED
position and apointjustshort
of reaching the TEST position.
3. The compartment door must be open during racking.
5.2.1 BREAKER INSERTION
1. Prior to lifting a breakerto 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 is OPEN.
d. Apply a thin, fresh coat of D50HD38 /ubricant to the
breaker 's primary disconnects.
e. Insure that the racking cams on the breaker are
correctly
posit i oned for initial engagement with the
pins in the compartment. To do this, insertthe rack-
ing handle and rotate it fully clockwise.
f. If a compartment contains a keylock, it will not ac-
cept the AKA-75/100 replacement breakers as re-
ceived.
The AKA drawout mechanism differs from
that
of its predecessor AK model, causing the AKA
breaker to mechanically interfere with the keylock
during breaker insertion.
To remedy this it will be
necessaryta relocate the keylock using
new mount·
ing hardware included as a modification kit. So
al -
tered, the compartment
accepts both AK and AKA
types.
2. Using a suitable lifting mechanism and spreader rig,
position lifting hooks at the cutout notches in the top wrap-
around frames
of thebreaker. Exercise care to avoid damage
to the control wiring.
3. Open the compartment.door. Keeping the rollout tray
positioned insidethe compartment, raise the breaker above
the elevation of the tray.
4. Depressthetestpositionstoplever and pull thetrayall
the way out to its WITHDRAWN position.
5. Lower the breaker over !he tray until it is about one-
half inch above the two dowel pins
on the tray. Push the
breaker back into the compartment until the 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 overthe two dowel pins. When
correctlypositioned
on thedowelpins, the breaker's rear and
side bottom flanges will rest firmly
on the tray.
7. Securethe breakerto the traybyinserting and tighten·
ing two-
-% inch hex-headscrews into thefrontholes of itsside
flanges.
8. If the breakeris a manually operated type, push it into
the compartment until the TEST position stop engages,
preven
ti ng further travel. The breaker is now in the TEST
position.
6
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If the breaker is ·electrically operated, push it into the
compartment until the spring discharge stop is encountered.
Releasethisbydepressingthe "springdischar
ge" 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
springdischargestop w/11 not be presentin
some AKO-type compartments originally furnished
forelectricallyoperated
AK -75a nd AK-100breakers
of the non-quick-close typ e.
9. Depress the TEST position stop lever and push the
breakerfartherintothecompartmentuntil !heoutersurfaces
of
t he rackingcams butt againstthe racking pinsinthe housing.
10. Insert the racking handle (673 00500 -636-05) on the
jackscrewshaft atthe upperright side
of the breaker. Rotate
it clockwi
se until the jackscrew comes to a solid stop. The
break
er is now in the CONNECTED position.
5.2.2 BREAKER REMOVAL
1. With the door closed and latched, trip the breaker.
2. Open the door and in sert the racking handle on the
jackscrew shaft. Rotate it counterclockwise until the jack-
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
testpositionstopengages. therebyholding the breakerinthe
TEST position.
1:
,_
RACKING
CAM
4.
To withdraw a ma nually operated breaker from TEST,
depress
th e testpositionstopleverandpullthebreakerout of
its compartment until the tray stops. At this position the tray
will be
fu lly withdrawn against its limit stop.
The wit hd raw al mov em ent for ele ctr ically operated
breakers differs from the above in that the tray is stopped
short of its WITHDRAWN limit
by the compartment-mounted
spring discharge
st op. In or der to complete the withdrawal,
the
dos i ng springs first must be discharged by depressing
the spring dischargelever
on the breaker. Next, keeping this
lev
er depr es sed, pull the breaker completely out ag ainst the
traylimitstop.Aramp cammountedon the compartment wall
keepsthe breaker t
ri p-free during the outwardtravelfrom the
TE ST position.
5. Before proceeding with subsequent operations to re-
move the
br eaker from the t ray, visually check the breaker's
CHARGED-DISCHARGEDandOPEN-CLOSEDindicatorsto
verifythat the breakerisopenand the springs are discharged.
This precaution is particularly important at locations where
AKR-75 and -100 breakers
ar e being deployed in AKO
equipments as replacements for AK-75 and -100 non-quick-
close electrical models; these compartmentsdid not need and
were notequipped with a spri
ng discharge stop.
6. Remove the two-3ti! inch hex-head screwswhich fasten
the breaker
to the compartment tray.
7. Using care to prevent damageto the wiring, attach the
lifting device to the cutout notc
he s in the top wraparound
frame
of th e breaker.
SPRING ------
TUBULAR TYPE
PRIMARY STUD
DISCONNECTS
DISCHARGE
LEVER
Fig.1 AKA-2-75 electrically operated,2-poleDe(AKO type)
7
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.·.
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.
5.3 CODE A (AKO SWITCHGEAR)
The drawout mechanism is equipment mounted and is
externally operated by a removable racking handle. The
breakerissupported bytwo pins protrudingfrom each side
of
its frame, these engaging slots in telescoping rails fastened
to the compartment walls.
The drawout operati
on features four positions -CON·
NECTED, TEST, DISCONNECTED and WITHDRAWN. In
the CONNECTED position the
pr imary and secondary dis-
connects are fully engaged. The breaker must be tripped
before itcan be rackedinto
or out of thisposition. In 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
pos itions with the compartment door closed.
Each positi
on isclearly identified by a rotary indicatorvisible
through an opening in the door.
SPRING
DISCHARGE--- '-
LEVER
With the
door open, thebreakerismanuallypulledoutfrom
the DISCONNECTEDto theWITHDRAWN position; here the
breaker is completely out
of its compartment, ready for re·
moval.
NOTE: All electrically operated AKR-75/100
breakers employ a spring discharge interlock
whichpreventsremoval
of the breakerwith its clos-
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 fever (Fig. 2).
This discharges the closing springs and releases
the breaker.
Manually operated breakers do not requi re this interlock
because their closing
spr ingsare never propped in the fully
chargedposition. Refertothe
"Manua lClosing" text in
section 8.2.
5.3.1 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. Insure that the breaker is OPEN.
d. Apply a thin, fresh coat of D50HD38 lubricantto the
breaker's primary disconnects.
Fig. 2 AKR-SA-75 electrically operated(AKD-5, 6 type)
8
Courtesy of NationalSwitchgear.com

2. Withthe movable inner housing of the compartment in
the CONNECTED positi on, insert the racking handle (part
no. 673D0500-636-05) on the jackscrew
shaft located at the
left side of the compartment justabove the position indicator.
3. Rotate the handle counterclockwise until the jack-
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 pull the right track
to the limit
of its travel.
6. Using a lifting device, raise the breaker until the
breaker mountingpins are approximatelyone-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. Pushthe breaker in againstthe trackstops. On electri-
cally operated breakers, be sure to depress the spring dis-
charge leverwhiledoingso. Rotate thetwo track-locklinks to
l
ock 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 jackscrew stops.
The indicator should read CONN.
1 O. Orientthe jackscrew so thatitsslotted sleeve is freeto
move outward. otherwise
the breaker will remain trip-free.
5.3.2 BRE AK ER REMOV AL (CODE A)
1. Trip the breaker. Insertthe racking handle into the jack-
screw shaft.
2. Rotatethe handlecounterclockwise until the jackscrew
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. If
the breaker is electrically operated, the breaker-mounted
Spring Discharge lever
must be depressed to permit with-
drawal.
9
NOTE: Spring discharge interlocks were notre-
quired and are not present in existing compart-
mentsoriginaflyfurnished fornon-quick-close type
e/ectricaflyoperatedAK-751100 breakers. Regard-
less of whether this interlocking hardware is
presentin a compartment,
ALWAYS verify that the
closing springs are discharged and the breakeris
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.
5.4 CODE B (AKR SUBSTRUCTURE)
(Figs. 3, 4)
The AKA substructure is a self-contained, open-type
frameworkserving asthe stationary receptacle for a drawout
breaker. Featuring closed-door
type drawout operation, it is
designed forconvenient mounting in individual breaker com-
partments
of drawout switchgear equipments. It provides
means for mak i ng the primary and secondaryconnections 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 side of the breaker frame. The cams engage fixed pins
mountedon both
side plates of the substructure, moving the
breakerin 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 AKA B breakers for use in substructures are equipped
with a "
deep" escutcheon instead of the standard escut-
cheon employed on all other models. This configuration al·
lows t
he breaker to be racked between the CONNECTED
and DISCONNECTED positions with the door closed. The
door does not move with the breaker as it does in the AKD-5
and AKD-6 models.
./
.~
Courtesy of NationalSwitchgear.com

5.4.1 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 of
foreign objects.
b. Verify that the breaker is the correct type for that
compartment.
c. Insure that the breaker is OPEN.
d. Apply a thin. fresh coat of DSOHD38 lubricantto the
breaker's primary disconnects.
e. Insure that the racking cams on the breaker are
correctly positionedtor 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 cut out notches in the top wrap-
aroundframes
of the breaker. Exercisecaretoavoiddamage
to the control wiring.
3. Open the compartment door. Keeping the rollout tray
positionedinside the compartment, raise the breaker above
the elevation
of the tray.
4. Pull the tray all the way out to its WITHDRAWN limit.
"PU SH TO WITHDRAW"
RELEASE LEVER
•
5. Lowerthe breakeroverthe tray until itisaboutone-half
inchabove the two dowel pins
on the tray. Push the breaker
backinto thecompartment until the rear bottom
fl ange of the
breaker rests against the guides behind the dowel pins.
6. Slowly lower and guidethe breakeronto the tray so the
holes in the rear flange fit over the two dowel pins. When
correctlypositioned
on thedowelpins.the breaker's rearand
side bottom flanges will rest firmly
on the tray.
7. Secure the breakerto the tray by inserting and tighten-
ing two-¥9 inch hex headscrewsintothefront holes
of itsside
flanges.
8. Push the breakerinto 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 fixed racking pins in the
compartment, ready to begin the racking motion.
It is to be noted that manuallyoperatedbreakermodels do
not employ a spring discharge interlock. It is unnecessary
because the
ir operating mechanism never statically posi-
tionsthe springsin afully-charged state. However,toprovide
necessary means for mechanically securing the breaker in
the DISCONNECTED position. a positi
on stop is employed.
It has a release lever marked "Push to Withdraw" and is
located
1n the same place as the spring discharge release
lever
on electrically operated breakers -see Fi g. 4.
F lg.4 AKR·SB-75 manuall y operated (su b st r ucture type)
10
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9. Close the compartmentdoor. Insertthe racking handle
(part no. 5686731G1-) through the opening at the upper right
of the door and onto the jackscrew shaft. By rotating the
handleclockwise, move the breakerthrough
th e TEST posi-
tion into the CONNECTED position; th e latter is indicated
when thejackscrewcomes to a solid stop. All three positions
-DISCONNECTED, TEST and CONNECTED -are in-
dexed on the right side
of the breaker escutcheon.
· 5.4.2 BREAKER REMOVAL (CODE B)
1. With the door closed and latched, trip the breaker.
2. Insertthe rackinghandle androtate itcounterclockwise
untilthebreakertravelsfrom CONNECTEDthrough TESTto
the DISCONNECTEDposition,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 leverto discharge the breake r' s
closing springs. While holding this lever depressed. pull the
breaker all the way out to its WITHDRAWN position.
On manually
oper ated breakers this release lever is
labeled "Push to Withdraw". See Section 5.4.1.
4. Before proceeding with subsequent operations to re-
move the breaker from the compartment. visually check the
break
er 'sspringcharge and close indicators to verify that the
breaker is open and the springs are discharged.
5. Remove the two-
3/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
wraparoundframe ofthe breaker. using care to prevent dam-
age to the wiring.
7.
Lilt the breaker approximately one-half inch off the
dowel pins. Push the tray back into the compartment.
8. Swing the breaker forwa
rd until the primary discon-
nects clear the compartment. Lower the breaker onto a
fl at
surface free of protrusions that could damage the breaker's
internal parts.
5.5 CODEC (AKD-6 SWITCHGEAR) (F ig. 5)
These breakers employ th esame drawoutarrangementas
the Code A models described in Section 5.3. Their drawout
operation and breaker insertion/removal procedures are
identical, but they differ significantly
in other aspec ts . As
indicated in Table 1, ttie AKR-( )C-75 is a 3200A
Ac frame
size compared tothe 3000A A model. The AKR-( )C-100 is
narrower than AKA-( )A-100 (25 versus
33 inches). All C
models employ finger-type primary disconnects instead of
th e tubular studs of the A types per fig. 2.
5.6 CODED (AKD-8 SWITCHGEAR) (Fig. 6)
Th e AKD-8 Switchgear uses the AKR substructure style
closed door drawout mechanism.The breaker is bolted to a
roller-mounted tray. The drawo
ut operation, breaker inser-
tion, and breaker removal is identical to the Code B (AKA
substructure) breakers described on pages 8-10. See Sec-
tion
5.1 for differences between Code Band D breakers.
5.7 CODE F (AKR SUBSTRUCTURE) (Fig. 7)
Code F breakers are identical to Code B except for ap-
pearance details and trip device(refer to Section 1.0) . The
drawoutoperation, breaker insertion, and breaker removal
is described under Code B breakers in Section 5.4.
Fig. 5 AKR-SC-75 ma nuallyoperated (AKD-6 type)
11
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•
..-.. .
0
FIG. 6 AKR-60-75 ELECTRICALLY OPERATED (AKD-8-TYPE)
I
-
"r
·. /
FIG. 7 AKR~F-75 ELECTRICALLY OPERATED (SUBSTRUCTURE TYPE)
12
Courtesy of NationalSwitchgear.com

.SECTION 6
Fuse Rollout
Elements
Whenthe 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 separa
te drawout compart-
ment 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 Fi
g. 8.
As listed in Table 4, these FRO 's are ava ilable in four
drawout styl
es , 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,
perforated steel s
cr een in front of the fuses. This panel
can be op
ened to allow access to the fuses only when the
FRO is in theWITHDRAWN position. In all otherpositions
an interference 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. Instead of acting
directly
on the racking mechanism, the keylock is arrang-
ed
to prevent inadvertent opening of the compartment
door.
So long as the breaker is closed, the FRO compart-
ment door cannot
be opened. If the breaker is open, the
keycan be removed and inserted in the
FRO compartment
lock; the
FRO compartment doorthen can be opened and
the element racked at will.
Operation
of the breaker compartment keylock is the
same tor all models. With the breakeropen, the key can
be
removed; this extendes the lock bolt, thereby maintaining
the breaker in a trip free state while in the CONNECTED
position. The breaker can be racked at will regardless
of
the keylock position.
Fig. 8 Fuse
rollout element TAK94FCA(AKD·S, 6 type)
TABLE 4 FUSE ROLLOUT ELEMENTS-600VAc, 50/60 Hz.
Frame Primary
Size Cat. Orawout Mounting Tvoe Stud
Width
(Amperes) No. AKO ADK-5 AKD-6 AKO-a Substructure T
ype
(Inc hes )
3000 TAK83FCO x Tube 25
TAK83FCA x x Tube
25
TAK83FCB x Fingers 25
3200 TAK83FCC x Fingers 25
TAK83FCD x Fingers 25
TAK94FCO I x Tube
33
TAK94FCA x x Tube 33
4000 TAK94FCB x Fingers 25
TAK94FCC x Fingers
25
TAK94FCD x F in gers 25
13
" .
., .
Courtesy of NationalSwitchgear.com

SECTION 7
Connections
7.1 Primary Power
7.2 Secondary Control
14
14
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.
7.1 PRIMARY POWER
In all electrical connections good joint conductivity is a
must. When
making power connect ions to stationary
breakers, the matingjointsurfacesmust beclean and havea
smooth finish. They should be parallel and firmly bolted or
clamped together. In addition, the bus
or cable conductors
must have ample ampacity to prevent overheating.
7.2 SECONDARY CONTROL
Control connections to stationary breakers are made to a
terminal board mounted on the breaker. Figure 9 shows
typical closing and tripping connections. Ifequipped with an
overcurrenttrip devicewhich includesagroundtauItelement
for use on 4-wire circuits, an additional 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
breakercompartment on the stationary portion ofseparable
secondary disconnects -see fig. 10.
q_Deoooooo
TE RM IN AL aOARO 1
MOUNTED ON FRONT
OF BREAK ER AT
UPPER LEFT
CUSTOMER
CONNECTIONS
2
CL OS E
3 4
CLOSING
SOURCE
5
TRIP
6 7 8
UV
TRIP
9 10 TO
AUX.SW
"a" CONTACT
FUSE
SOURCE
(-) (-r)
TRIP
SOURCE
REVERSE
CURRENT
DEVICE
POTENTIAL
SO URCE
Fig. 9 Control connections to stationary breakers - front view.
sJ~:CE {(Y)
( X)~
TRIP
/\
7654321
1
FUSE
(Y)} CLOSING
SOURCE
t---41•(X)
/\/\ /\ /\/\ /\/\
7654321
/\/\ /\ /\ /\ /\/\
7654321
STAT IO NARY SECONDARY DISCONNECT BLOCKS
LOCATED
AT TOP OF COMPARTMENT -
POSITIONS
~AND QFURNISH ED
ONLY WHEN REQUIRED
Fig. 10 Control connections to drawout breakers - front view of breaker compartment.
J
14
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SECTION 8
Operation
8.1 Gen eral
8.2 Manual Clo sing
8.3 El ectric al Closing
8.4 Tripping
8.5 Current Rating For Auxiliary Devices
8.1 GENERAL
15
15
15
16
16
The AKR·75 and AKR-100 breakers are closed by the
discharging
of the energystored in the closing springs ofthe
breaker.As the closing springs aredischarged, theenergyis
directedintotheclosing cam
of the breakerwhich causes the
moveable breaker contacts to beforced against the station-
ary contacts, and, at the same time causes the opening
springs
to be chargedsothey mayopenthe breaker during a
subsequent opening operation.
8.2 MANUAL CLOSING
Manually operated breakers are equipp ed with a handle
which extends from the escutcheon of the breake
r. Alter-
nately rotating the closing handle counterclockwise th
en
clockwise through approximately 120 degrees of rotation
through four complete cycles willcausethe breaker to close.
During the four counterclockwise movements and
th e first
three clockwise movements
of the handle, the springs are
progressively charged. After approximately seven degrees
travel of the fourth clockwi
se handle movement, the spring
charge mechanism is driven "over center" and the energy
stored inthe closing springs is directed into the closing cam
and causes the breaker to close. A charge-indicator, num-
bered one to four,
vi si ble through the breaker escutcheon,
indicates the number of complete handle movements that
have be
en performed.
CONTROL
SOURCE
FU
REMOTE
CLOSE
o-----o- - --1 ~-.,
,A.
x
~r
'Ix
GI
_J
x
t~P8
..,
I
Fl
1
...J
L
w
cc
8.3 ELECTRICAL CLOSING
On electrically operated breakers the closing springs are
charged by agear motor. With the springs discharged, volt·
age applied to the cont
rol circuit will energize the motor
through the
"G" switch contacts -see fig. 11. The motor,
through the gear reduction output cran
k, compresses the
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 deenergizing the motor and the "F" switch establish-
ing a circuit to
th e "X" relay. At the same time, a mechanical
prop
is positioned to prevent the discharge of the fully
charged closing spring.
With theclosing spring propped fully-charged, the breaker
isreadyforclosing. This may
be accomplishedelectrically by
depressingthe closing switch on the break
er (ifsoequipped}
or by aremote closing switch.Operationoftheclosing switch
energizes the "X" relay, which
in turn energizes the closing
solenoid. This removes the prop, releasing the closing
springs to close the break
er.
As the c lo sing relay is energized, it energizes anti-pump
relay
"W" .Iftheclosing switch is maintainedclosed.the anti-
pumprelay wi
II remainpicked-up to prevent asecondclosing
operation on the breaker
in the event it is tripped open
automatically. The closing impulse must be released and
reapplied befo
re a second closing operation can occur.
1-
~ FU
J: TRIP
L
TC
LEGEND
CC-CLOSIN G SOLENOID
F -CUTOFF SWITCH, CLOSED
WHEN CLO
SI NG SPRING IS
FULLY CHARGED.
G - CUTOFF SWITCH. OPEN WHEN
CLOSING SPRING IS
FULLY CHARGE D.
L -AUXILIA RY SWITCH
M -CHARGING MOTOR
PB -CLOSE PUSHB UTIO N ON
BREAKER ESCUTCHEON,
OPTIONAL.
TC -SHUNT TRIP DEVICE
W - ·ANTI-PU MP RELAY
X -CONTROL RELAY
FIG. 11 Elementarydiagram for electricallyoperated drawoutbreaker.
Contact posltione
are shown with breakeropen and closing springs discharged.
15
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8.4 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 rigidlyfastened to a horizon-
tal trip shaft running from left to right through the breaker.
In
turn, thetrip shaftcarriespaddlesactuatedby the manual trip
button and the various other trip devices -overcurrent,
reverse current, shunttrip, 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
breakertrip free, i.e., prevent the contacts from closing even
though a closing impulse is applied to the mechanism. Such
de'(icesarethe undervoltage, bellalarm and lockout, electric
lockout. open fuse lockout, and the key operated locks.
8.5 CURRENT RATINGS
FOR AUXILIARY DEVICES
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 viathe C secondary disconnect
block on the breaker thru the B secondary 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 powerfrom being supplied to the load.
An indicatoron the OFLOdevice signals which fuse is blown.
The breaker cannot be closed until the blown fuse
is ac-
knowledged by resetting the OFLO, and presumably replac-
ing the blown fuse.
TABLE 5. CURRENT RATINGS FOR AUXILIARY DEVICES
Voltage
Interrupting Rating
(Amps)
Type Load or P.F.
Auxiliary Bell Alarm
Nominal Range Switch Switch
48 de
38-56
25.00 -
125 de 100-140
11.00 2.5
Resistance 250 de 200·280
2.00 0.9
600 de
508-672
0.45
0.3
48 de
38-56
15.00 -
Electro-Magnet 125 de 100-140 6.25
2.5
250 de
200-280 1.75 0.9
600 de
508-672
0.35 0.3
120 ac 104-127 75.0 30.0
75-85% Lagging 240 ac 208-254 50.0 15.0
480 ac 416·508 25.0 7.0
-
600 ac
520-635 12.0 5.0
120 ac 104-127 50.0 30.0
30-35% Lagging 240 ac 208-254 25.0 15.0
480 ac 416·508 12.0 7.0
600 ac
520-635 8.0 5.0
·20.0 ·10.0
50.0 30.0
•on drawout breakers, limited to the 5 ampere continuous rating of #16 gage wire.
16
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SECTION 9
Maintenance
9.1 Inspection
9.2 Lubrication
9.3 Reference Publications
9.1 INSPECTION
17
17
17
Periodic inspection of the circuit breakerisrecommended
at least once a year. More frequent inspections are recom-
mended where severe load conditions. dust, moisture
or
otherunfavorableconditions exist, or if the vital nature of the
load warrants it.
Alwaysinspectthe breaker aftera short-circuitcurrent
has
been interrupted.
At the
lime 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 (568B386G1) to the motor
gear reducer shaft
on the front right side of the breaker.
Ratchetthemaintenancecrankupand
down until thesprings
arefullycharged as indicated
by thedistinctclick asthe prop
is set and prevents
any further charging of the closing
springs. After the prop isset
do not apply undue force to the
maintenance handle.
(2) Depress the "Spring Discharge" lever located
under
the horizontal supporton 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
breakerandthe bottom
of the compartmentfor any 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. Checkinsulating parts for evidence
of overheating and
to~ cracks that indicate excessive thermal aging.
17
9.2 LUBRICATION
rn general. the circuit breaker requires moderate lubrica-
tion. Bearing pointsandsliding surfaces should belubricated
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 BERE·
MOVED WITH A CLEAN
CLOTH TO AVOID ACCUMULA·
TION
OF DIRT OR DUST.
On drawoutbreakers the contactsurface of the disconnect
studs should be cleaned and greased with GE Lubricant
D50HD38.
9.3 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, referto the following instruction manuals applica-
ble totheAKR·75 and AKR·100breakers.
MaintenanceManual
.................. GEK-64460
Renewal Parts
....................... GEF-4552
EC
Trip Devices ...................... GEl-86157
ECS/SST
Test Sets:
Cat. TAK-TS1
...................... GEK-64454
Cat. TAK·TS2
...................... GEK-73300-1
...__;,;. ·
Courtesy of NationalSwitchgear.com

SECTION 10
Interchangeability
of Drawout Breakers
10.1 General 19
10.2 No
Letter AKD Types 19
10.3
Code A Types
19
10.4
Code B Types
19
10.5
Code C Types
19
10.6
Code D Typ es 19
10.7
Code F Types 19
10.8 E-
Type Rejection 19
18
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Interchangeability of
Drawout Breakers
10.1 GENERAL
Low-voltage switchgear practice requires that drawout
breaker elements ofthe same ampere frame size be
ph ysi -
cally
in terchangeable. Electrical interchangeability of sec-
ondary and control circuits, of cou
rse , requires duplicate
wiring. The six drawout styles (AKO, A, 8,
C, 0 & F) of the
AKR-75 and-100models satisfy this requireme
nt in varying
degree. The
8, C, 0 and F types. being of more recent
design, limit interchangeability within a given frame size to
those units having the same voltage rating; rejection
of un-
wanted types thus is more selective
th an that of the earlier
AKO and AKD-5 models. The individual interchangeabili
ty
patterns are illustrated in Fig. 12.
The AKR-75/100
8, C, D, and F models are id entical in
height and width. These breakers are equipped
with the
means to prevent inadvertent interdlangeoft
he B, D and F
types with the C type in the 3200 and 4000 ampere
siz es.
Rejection means are notrequired on the AKO and Code A
breakers; the -100 frame is widerthan the -
75. making them
inherently non-interchangeable.
10.2 NO-LETTER AKO TYPES
As the Fig. 12 directional arro ws indicate, all AKO ele-
ments are interchangeable within each frame size.
Considering that the AKR-75
AKO , Band O type breaker
models are identical
in width and employvery si milardrawout
mechanisms, rejection plates are added to the
AKO AKA· 75
models to preventtheirinsertion into Btype substructur es an d
AK0-8 switchgear. See Fig.13 .
10.3 CODE A TYPES
Interchangeability is identical to that of the AKO type.
10.4 CODE B TYPES
Interchangeability within and betw ee n frame sizes is pre-
vented by the rejection system of Fig.
15. Variously posi-
tioned pins on
th e drawoul tray must align with matching
hol
es 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.
Becausethe B-type drawoutmechanism isnearly identical
to the AKO type, all B elements include additional means to
rejectthemfrom AKO compartment
s. An outriggerbracket is
attachedto theright edgeofthe rear fra
me of each Bbreaker
per Fig. 14. This interf
-;ires with the rampcam on the rightwall
of the AKO compartrr.ent
an d prevents entry of the B unit.
19
10.5 CODEC TYPES
All Celements are unique and non-interchangeable with in
and between frame sizes. This is accomplished bythe rejec-
tion hardware system of Fig. 15. Various
ly positioned inter-
ference pi
ns on the rollout tracks cooperate with notched
brackets fastened
to the breaker's side pl ates. Wh en inser-
tion ofthe
wr o ng breakeris attempted, the pins and notches
donotalign.there
by preventing thebreakerfrom sealing into
the track slots.
C elements employthe A-type drawout mechanism. but
in
modi fi ed form to prevent interchangeability with the A units.
The modification spaces the breaker's right side mounting
pinson shortercenters (10-1 H16) than tho
se on the leftside
(11-7i8).
See Fig. 12 .
10.6 CODED TYPES
Interchangeability is identical to that ofthe Code B type.
10.7 CODE F TYPES
Interchangeability is identical to that of the Code B type.
10.8 "E-TYPE" REJECTION
Someinstall at ions 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 speci
al category breakers are
designated as
"E- type". They are interchangeable as fol·
lows:
• E-type compartments reject standa
rd breakers.
• Standard compartments accept E-type breakers.
E-type rejection
is an opti on al feature availab le on B, Cand
D
cod e breakers only.
On Code B. D and F breake
rs , "1eE-type rejection feature
is providedvia an extra holein each bottom flange engaging
corresponding pins added to the drawout t ·
-3y. See Fig. 17.
On Code C breakers. E-type rejection
is achieved by
notchi
ng the breaker's right side plate to clear a speci al
rejection pin added to the rig ht slide ra il. See Fig. 18.
All E-type breakers have the suttix letter E added to the
middle digits of their designation as sho
wn by the following
example: AK
R- 4BE-75.
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