GE MicroVersaTrip AKR-75 User manual
»
Installation
and
Operation
of
Type
AKR
-
75
and
AKR
-
100
Low
-
Voltage
Power
Circuit
Breakers
CONTENTS
SECTION
6
6.0
FUSE
ROLLOUT
ELEMENTS
SECTION
7
7.0
CONNECTIONS
7.1
Primary
Power
7.2
Secondary
Control
SECTION
1
1.0
INTRODUCTION
3
13
14
SECTION
2
2.0
RECEIVING
,
HANDLING
AND
STORAGE
14
14
4
SECTION
8
8.0
OPERATION
8.1
General
8.2
Manual
Closing
8.3
Electrical
Closing
8.4
Tripping
8.5
Current
Rating
For
Auxiliary
Devices
SECTION
3
3.0
INSTALLATION
3.1
Class
1
E
Application
3.2
Location
3.3
Mounting
Types
15
»
4
15
4
15
4
15
4
16
SECTION
4
4.0
STATIONARY
BREAKERS
16
5
SECTION
9
9.0
MAINTENANCE
9.1
Inspection
9.2
Lubrication
9.3
Reference
Publications
17
SECTION
5
5.0
DRAWOUT
BREAKERS
5.1
General
5.2
No
Code
Letter
-
AKD
Switchgear
5.2
.
1
Breaker
Insertion
5.2
.
2
Breaker
Removal
5.3
Code
A
-
AKD
5
/
6
Switchgear
5.3
.
1
Breaker
Insertion
5.3
.
2
Breaker
Removal
5.4
Code
B
-
AKR
Substructure
5.4
.
1
Breaker
Insertion
5.4
.
2
Breaker
Removal
5.5
Code
C
-
AKD
6
Switchgear
5.6
Code
D
-
AKD
8
Switchgear
5.7
Code
F
-
AKR
Substructure
17
5
17
6
17
6
SECTION
10
10.0
INTERCHANGEABILITY
OF
DRAWOUT
BREAKERS
10.1
General
10.2
No
Letter
AKD
Types
10.3
Code
A
Types
10.4
Code
B
Types
10.5
CodeC
Types
10.6
Code
D
Types
10.7
Code
F
Types
10.88
E
-
Type
Rejection
6
7
18
8
19
8
19
8
19
8
19
10
19
11
19
11
19
»
11
19
11
2
Courtesy of NationalSwitchgear.com
SECTION
1
Introduction
i
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
and
/
or
mounting
type
as
indicated
in
Table
1
.
Table
1
MOUNTING
TYPE
FRAME
SIZE
(
Amperes
)
BREAKER
WIDTH
(
Inches
)
PRIMARY
STUD
TYPE
DEEP
ESCUTCHEON
BREAKER
DESIGNATION
DRAWOUT
Stationary
Sub
*
Structure
600
V
.
Ac
50
/
60
Hz
.
AKD
-
8
AKD
-
5
AKD
-
6
AKD
250
V
.
DC
Bar
X
AKR
-
O
-
75
3000
Tube
X
25
Tube
X
X
AKR
-
(
*
)
A
-
75
4000
Fingers
X
X
AKR
-
HB
-
75
Fingers
AKR
-
(
»
)
C
-
75
X
3200
Fingers
X
X
AKR
-
nD
-
75
Fingers
X
X
AKR
-
(
*
)
F
-
75
Bar
X
AKR
-
(
*
)
S
-
75
Tube
AKR
-
n
-
100
X
33
Tube
AKR
-
(
*
)
A
-
10
Q
X
X
Fingers
X
X
AKR
-
(
*
)
B
-
100
25
Fingers
X
AKR
-
(
*
)
Q
100
6000
4000
Fingers
X
X
AKR
-
nD
-
100
Fingers
X
X
AKR
-
(
*
)
F
’
10
Q
Bar
X
AKR
-
HS
-
100
Bar
33
i
X
AKR
-
OW
-
100
SPECIAL
DC
BREAKERS
FOR
FIELD
SWITCHING
Tube
ARK
-
N
-
75
F
X
Fingers
X
X
AKR
-
NB
-
75
F
25
Fingers
X
AKR
-
ND
-
75
F
X
4000
Fingers
X
X
AKR
-
NF
-
75
F
Bar
X
AKR
-
NS
-
75
F
33
Tube
AKR
-
N
-
100
F
X
Fingers
X
X
AKR
-
NB
-
100
F
Fingers
X
X
6000
AKR
-
ND
-
100
F
Fingers
X
X
AKR
-
NF
-
100
F
25
Bar
X
AKR
-
NS
-
100
F
33
Bar
X
AKR
-
NW
-
100
F
Example
:
AKR
-
5
B
-
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
E
02
A
.
Dc
only
.
4
=
ECS
5
-
SST
50
/
60
Hertz
only
.
6
=
MicroVersaTrip
50
/
60
Hertz
only
.
7
=
MicroVersaTrip
RMS
-
9
50
/
60
Hertz
only
.
8
=
EPIC
MicroVersaTrip
.
9
=
MicroVersaTrip
Plus
and
PM
50
/
60
Hertz
only
.
For
detailed
information
on
these
trip
devices
refer
to
the
following
publication
:
GEI
-
86157
N
=
Non
-
automatic
.
In
addition
,
all
non
-
automatic
250
V
.
Dc
breaker
types
carry
the
suffix
letter
D
after
the
frame
number
,
e
.
g
.
,
AKR
-
N
B
-
75
D
.
i
Courtesy of NationalSwitchgear.com
SECTION
3
SECTION
2
Installation
Receiving
,
Handling
,
and
Storage
3.1
CLASS
1
E
APPLICATION
NOTE
:
Before
installing
in
a
Nuclear
Class
1
E
application
,
verify
that
this
product
is
intended
for
such
use
by
checking
the
procurement
records
.
Breakers
with
MicroVersaTrip
Plus
or
MicroVersaTrip
PM
trip
units
are
not
intended
for
use
in
Class
IE
applications
.
Before
installing
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
.
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
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
or
left
in
the
packaging
material
.
Blow
out
any
dirt
or
loose
particles
of
packaging
material
remaining
on
or
in
the
breaker
.
If
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
oh
the
breaker
.
3.2
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
.
3.3
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
TABLE
2
MOUNTING
TYPE
CODES
Breaker
Type
Code
Letter
Drawout
Stationary
None
AKD
A
AKD
-
5
,
6
B
Substructure
C
AKD
-
6
Only
AKD
-
8
D
F
Substructure
AKR
-
75
/
100
(
25
"
wide
)
S
AKR
-
100
(
33
"
wide
)
W
4
Courtesy of NationalSwitchgear.com
SECTION
5
SECTION
4
Stationary
Breakers
Drawout
Breakers
5.1
General
5.2
No
Code
Letter
-
AKD
Switchgear
5.2
.
1
Breaker
Insertion
5.2
.
2
Breaker
Removal
5.3
Code
A
-
AKD
5
/
6
Switchgear
5.3
.
1
Breaker
Insertion
5.3
.
2
Breaker
Removal
5.4
Code
B
-
AKR
Substructure
5.4
.
1
Breaker
Insertion
5.4
.
2
Breaker
Removal
5.5
Code
C
-
AKD
6
Switchgear
5.6
Code
D
-
AKD
8
Switchgear
5.7
Code
F
-
AKR
Substructure
6
6
These
breakers
are
designed
lor
mounting
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
.
6
7
8
8
9
9
10
The
surface
on
which
the
breaker
is
mounted
must
be
flat
to
avoid
internal
distortion
of
the
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
.
11
11
11
11
Outline
drawing
numbers
giving
dimensions
for
designing
a
suitable
enclosure
for
the
stationary
AKR
-
75
and
AKR
-
100
types
are
given
below
.
TABLE
3
Outline
Drawing
Stationary
Breaker
Type
Breaker
Width
Manually
Operated
Electrically
Operated
AKR
-
(
)
S
-
75
25
"
139
C
4560
139
C
4561
AKR
-
(
)
S
-
100
25
"
AKR
-
(
)
W
-
100
139
C
4562
33
"
139
C
4563
e
5
Courtesy of NationalSwitchgear.com
|
Drawout
Breakers
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
.
5.1
GENERAL
Drawout
breakers
are
manufactured
in
six
different
styles
,
identified
in
Table
2
by
the
mounting
code
letters
None
,
A
,
B
,
C
,
D
&
F
.
The
“
no
-
letter
”
models
are
used
in
General
Electric
'
s
AKD
Switchgear
.
Code
A
breakers
were
later
introduced
with
AKD
-
5
Switchgear
and
feature
dosed
-
door
drawout
opera
-
tion
.
Code
Band
F
breakers
provide
an
alternate
dosed
-
door
drawout
arrangement
with
the
stationary
element
furnished
as
a
preassembied
“
substructure
/
1
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
with
the
AKD
-
8
Switchgear
and
feature
the
Code
B
dosed
-
door
drawout
mechanism
.
The
construction
and
operation
of
each
of
these
drawout
styles
is
covered
under
respective
headings
in
the
following
text
.
NOTE
:
The
Code
B
and
Code
F
drawout
types
are
mutually
interchangeable
.
The
“
no
-
letter
,
”
Code
A
,
Code
C
and
Code
D
drawout
types
are
mutually
noninterchangeable
.
Before
attempting
to
insert
a
breaker
,
verify
that
the
breaker
model
matches
the
compartment
.
The
Code
B
,
D
,
and
F
breakers
are
identical
except
for
the
following
:
a
.
Position
indication
label
.
This
label
is
mounted
on
the
sides
of
the
breaker
’
s
deep
escutcheon
and
indicates
the
DISCONNECTED
,
TEST
,
and
CONNECTED
posi
-
tions
.
The
Code
D
breaker
label
indicates
the
proper
position
only
in
AKD
8
switchgear
.
The
Code
B
and
F
breaker
labels
indicate
properly
only
in
AKR
Substruc
-
tures
.
b
.
Trip
device
.
Code
D
and
F
breakers
are
factory
sup
-
plied
with
MicroVersaTrip
or
PM
trip
units
.
5.2
.
1
BREAKER
INSERTION
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
D
50
HD
38
lubricant
to
the
breaker
'
s
primary
disconnects
.
e
.
Insure
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
.
f
.
If
a
compartment
contains
a
keylock
,
it
will
not
ac
-
cept
the
AKR
-
75
/
100
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
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
.
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
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
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
-
%
inch
hex
-
head
screws
into
the
front
holes
of
its
side
flanges
.
8
.
If
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
.
i
c
.
Appearance
.
Code
D
and
F
breakers
use
a
different
color
scheme
on
their
deep
escutcheons
and
labels
.
Also
,
they
have
a
differently
shaped
manual
operating
handle
.
5.2
NO
CODE
LETTER
(
AKD
SWITCHGEAR
)
(
Fig
.
1
)
These
“
no
-
letter
”
AKR
-
75
/
100
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
BType
(
see
Section
5.4
)
.
In
addition
to
the
characteristics
listed
in
Table
1
,
the
AKD
drawout
has
the
following
unique
aspects
:
i
6
Courtesy of NationalSwitchgear.com
If
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
.
4
.
To
withdraw
a
manually
operated
breaker
from
TEST
,
depress
the
test
position
stop
lever
and
pull
the
breaker
out
of
its
compartment
until
the
tray
stops
.
At
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
spring
discharge
stop
.
In
order
to
complete
the
withdrawal
,
the
closing
springs
first
must
be
discharged
by
depressing
the
spring
discharge
lever
on
the
breaker
.
Next
,
keeping
this
lever
depressed
,
pull
the
breaker
completely
out
against
the
tray
limit
stop
.
A
ramp
cam
mounted
on
the
compartment
wall
keeps
the
breaker
trip
-
free
during
the
outward
travel
from
the
TEST
position
.
5
.
Before
proceeding
with
subsequent
operations
to
re
-
move
the
breaker
from
the
tray
,
visually
check
the
breaker
’
s
CHARGED
-
DISCHARGED
and
OPEN
-
CLOSED
indicators
to
verify
that
the
breaker
is
open
and
the
springs
are
discharged
.
This
precaution
is
particularly
important
at
locations
where
AKR
-
75
and
-
100
breakers
are
being
deployed
in
AKD
equipments
as
replacements
for
AK
-
75
and
-
100
non
-
quick
-
close
electrical
models
;
these
compartments
did
not
need
and
were
not
equipped
with
a
spring
discharge
stop
.
i
NOTE
:
A
spring
discharge
stop
will
not
be
present
in
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
breaker
farther
into
the
compartment
until
the
outer
surfaces
of
the
racking
cams
butt
against
the
racking
pins
in
the
housing
.
10
.
Insert
the
racking
handle
(
673
D
0500
-
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
position
.
5.2
.
2
BREAKER
REMOVAL
1
.
With
the
door
closed
and
latched
,
trip
the
breaker
.
6
.
Remove
the
two
-
%
inch
hex
-
head
screws
which
fasten
the
breaker
to
the
compartment
tray
.
2
.
Open
the
door
and
insert
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
test
position
stop
engages
,
thereby
holding
the
breaker
in
the
TEST
position
.
7
.
Using
care
to
prevent
damage
to
the
wiring
,
attach
the
lifting
device
to
the
cutout
notches
in
the
top
wraparound
frame
of
the
breaker
.
i
i
Fig
.
1
AKR
-
2
-
75
electrically
operated
,
2
-
pole
Dc
(
AKD
type
)
7
Courtesy of NationalSwitchgear.com
8
.
Lift
the
breaker
approximately
one
-
half
inch
off
the
dowel
pins
.
Push
the
tray
back
into
the
compartment
.
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
moval
.
re
-
i
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
.
NOTE
:
All
electrically
operated
AKR
-
751100
breakers
employ
a
spring
discharge
interlock
which
prevents
removal
of
the
breaker
with
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
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
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
D
50
HD
3
Q
lubricant
to
the
breaker
’
s
primary
disconnects
.
5.3
CODE
A
(
AKD
SWITCHGEAR
)
The
drawout
mechanism
is
equipment
mounted
and
is
externally
operated
by
a
removable
racking
handle
.
The
breaker
is
supported
by
two
pins
protruding
from
each
side
of
its
frame
,
these
engaging
slots
in
telescoping
rails
fastened
to
the
compartment
walls
.
The
drawout
operation
features
four
positions
—
CON
-
NECTED
,
TEST
,
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
.
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
positions
with
the
compartment
door
closed
.
Each
position
is
clearly
identified
by
a
rotary
indicator
visible
through
an
opening
in
the
door
.
i
ft
Fig
.
2
AKR
-
5
A
-
75
electrically
operated
(
AKD
-
5
,
6
type
)
8
Courtesy of NationalSwitchgear.com
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
.
2
.
With
the
movable
inner
housing
of
the
compartment
in
the
CONNECTED
position
,
insert
the
racking
handle
(
part
no
.
673
D
0500
-
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
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
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
jackscrew
stops
.
The
indicator
should
read
CONN
.
10
.
Orient
the
jackscrew
so
that
its
slotted
sleeve
is
free
to
move
outward
,
otherwise
the
breaker
will
remain
trip
-
free
.
<
5.4
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
.
It
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
side
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
other
models
.
This
configuration
al
-
lows
the
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
.
5.3
.
2
BREAKER
REMOVAL
(
CODE
A
)
1
.
Trip
the
breaker
.
Insert
the
racking
handle
into
the
jack
-
screw
shaft
.
2
.
Rotate
the
handle
counterclockwise
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
.
<
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
-
75
/
100
breakers
.
Regard
-
less
of
whether
this
interlocking
hardware
is
present
in
a
compartment
,
ALWAYS
verify
that
the
closing
springs
are
discharged
and
the
breaker
is
tripped
OPEN
before
removal
is
attempted
.
Fig
.
3
AKR
drawout
substructure
Cat
.
No
.
TAK
8
SS
02
3200
amperes
i
9
Courtesy of NationalSwitchgear.com
I
5.4
.
1
BREAKER
INSERTION
(
CODE
B
)
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
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
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
-
%
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
fixed
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
.
It
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
.
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
D
50
HD
38
lubricant
to
the
breaker
’
s
primary
disconnects
.
e
.
Insure
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
.
i
FINGER
-
TYPE
PRIMARY
DISCONNECTS
“
PUSH
TO
WITHDRAW
”
RELEASE
LEVER
I
Fig
.
4
AKR
-
9
F
-
75
manually
operated
(
substructure
type
)
10
Courtesy of NationalSwitchgear.com
p
8
.
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
.
9
.
Close
the
compartment
door
.
Insert
the
racking
handle
(
part
no
.
568
B
731
G
1
)
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
.
5.5
CODE
C
(
AKD
-
6
SWITCHGEAR
)
(
Fig
.
5
)
These
breakers
employ
the
same
drawout
arrangement
as
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
aspects
.
As
indicated
in
Table
1
,
the
AKR
-
()
C
-
75
is
a
3200
A
Ac
frame
size
compared
to
the
3000
A
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
.
5.4
.
2
BREAKER
REMOVAL
(
CODE
B
)
1
.
With
the
door
closed
and
latched
,
trip
the
breaker
.
2
.
Insert
the
racking
handle
and
rotate
it
counterclockwise
until
the
breaker
travels
from
CONNECTED
through
TEST
to
the
DISCONNECTED
position
,
as
indicated
by
the
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
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
breaker
’
s
spring
charge
and
close
indicators
to
verify
that
the
breaker
is
open
and
the
springs
are
discharged
.
5
.
Remove
the
two
-
%
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
.
5.6
CODE
D
(
AKD
-
8
SWITCHGEAR
)
(
Fig
.
6
)
The
AKD
-
8
Switchgear
uses
the
AKR
substructure
style
closed
door
drawout
mechanism
.
The
breaker
is
bolted
to
a
roller
-
mounted
tray
.
The
drawout
operation
,
breaker
inser
-
tion
,
and
breaker
removal
is
identical
to
the
Code
B
(
AKR
substructure
)
breakers
described
on
pages
8
-
10
.
See
Sec
-
tion
5.1
for
differences
between
Code
B
and
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
drawout
operation
,
breaker
insertion
,
and
breaker
removal
is
described
under
Code
B
breakers
in
Section
5.4
.
4
BREAKER
MOUNTING
PINS
1011
/
16
"
Fig
.
5
AKR
-
5
C
-
75
manually
operated
(
AKD
-
6
type
)
11
Courtesy of NationalSwitchgear.com
SECTION
6
<
All
FRO
models
except
the
AKD
type
feature
a
hinged
,
perforated
steel
screen
in
front
of
the
fuses
.
This
panel
can
be
opened
to
allow
access
to
the
fuses
only
when
the
FRO
is
in
the
WITHDRAWN
position
.
In
all
other
positions
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
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
.
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
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
Fig
.
8
.
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
.
Operation
of
the
breaker
compartment
keylock
is
the
same
for
all
models
.
With
the
breaker
open
,
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
.
Fuse
rollout
element
TAK
94
FCA
(
AKD
-
5
,
6
type
)
TABLE
4
FUSE
ROLLOUT
ELEMENTS
—
600
VAc
,
50
/
60
Hz
.
Primary
Frame
Size
(
Amperes
)
Stud
Width
(
Inches
)
Cat
.
Drawout
Mounting
Ty
ipe
AKD
-
8
ADK
-
5
Type
Substructure
No
.
AKD
-
6
AKD
25
Tube
TAK
83
FCO
X
3000
25
Tube
TAK
83
FCA
X
X
25
Fingers
TAK
83
FCB
X
25
Fingers
TAK
83
FCC
3200
X
Fingers
25
TAK
83
FCD
X
Tube
33
TAK
94
FCO
X
Tube
33
TAK
94
FCA
X
X
i
25
Fingers
TAK
94
FCB
X
4000
25
Fingers
TAK
94
FCC
X
25
Fingers
TAK
94
FCD
X
13
Courtesy of NationalSwitchgear.com
SECTION
7
»
Connections
14
7.1
Primary
Power
7.2
Secondary
Control
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
.
14
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
.
If
equipped
with
an
overcurrent
trip
device
which
includes
a
ground
fault
element
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
breaker
compartment
on
the
stationary
portion
of
separable
secondary
disconnects
—
see
fig
.
10
.
7.1
PRIMARY
POWER
In
all
electrical
connections
good
joint
conductivity
is
a
must
.
When
making
power
connections
to
stationary
breakers
,
the
mating
joint
surfaces
must
be
clean
and
have
a
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
.
Q
c
5
p
6
o
o
o
o
o
o
TERMINAL
BOARD
MOUNTED
ON
FRONT
OF
BREAKER
AT
UPPER
LEFT
—
123456789
1 0
TO
AUX
.
SW
.
“
a
”
CONTACT
^
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’
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I
FUSE
f
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CUSTOMER
CONNECTIONS
3
T
T
T
TRIP
f
1
>
SOURCE
(
-
)
(
+
)
n
IT
REVERSE
CURRENT
DEVICE
POTENTIAL
SOURCE
CLOSING
SOURCE
TRIP
SOURCE
Fig
.
9
Control
connections
to
stationary
breakers
—
front
view
.
D
LLJ
(
Y
)
<
Y
)
TRIP
SOURCE
“
CLOSING
SOURCE
FUSE
D
—
IH
n
r
(
X
)
(
X
)
TRIP
CLOSE
r
Th
'
A
A
A
A
AA
A
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A
7
6
5
4
3
2
1
J
l
7654321
7
6
5
4
3
2
1
C
A
B
STATIONARY
SECONDARY
DISCONNECT
BLOCKS
LOCATED
AT
TOP
OF
COMPARTMENT
—
POSITIONS
6
AND
C
ONLY
WHEN
REQUiRED
FURNISHED
>
Fig
.
10
Control
connections
to
drawout
breakers
—
front
view
of
breaker
compartment
.
1 4
Courtesy of NationalSwitchgear.com
SECTION
8
Operation
<
15
8.1
General
8.2
Manual
Closing
8.3
Electrical
Closing
8.4
Tripping
8.5
Current
Rating
For
Auxiliary
Devices
8.1
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
.
8.2
MANUAL
CLOSING
Manually
operated
breakers
are
equipped
with
a
handle
which
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
stored
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
complete
handle
movements
that
have
been
performed
.
15
15
16
16
8.3
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
.
11
.
The
motor
,
through
the
gear
reduction
output
crank
,
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
MG
”
switch
deenergizing
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
”
.
If
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
.
<
T
-
REMOTE
CLOSE
FU
FU
HI
—
i
LEGEND
TRIP
t
I
A
l
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
BREAKER
ESCUTCHEON
,
OPTIONAL
TC
—
SHUNT
TRIP
DEVICE
W
—
"
ANTI
-
PUMP
RELAY
X
—
CONTROL
RELAY
CONTROL
SOURCE
^
PB
iV
4
I
r
“
I
L
:
r
.
T
;
pi
1
i
=
b
*
i
GI
J
1
L
x
I
1
r
:
ZZco
I
I
I
I
J
I
L
<
TC
y
.
(
FIG
.
11
Elementary
diagram
for
electrically
operated
drawout
breaker
.
Contact
positions
are
shown
with
breaker
open
and
closing
springs
discharged
.
15
Courtesy of NationalSwitchgear.com
>
8.4
TRIPPING
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
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
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
-
ing
the
blown
fuse
.
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
.
8.5
CURRENT
RATINGS
FOR
AUXILIARY
DEVICES
TABLE
5
.
CURRENT
RATINGS
FOR
AUXILIARY
DEVICES
>
Interrupting
Rating
(
Amps
)
Voltage
Type
Load
or
P
.
F
.
Auxiliary
Switch
Bell
Alarm
Switch
Nominal
Range
48
dc
38
-
56
25.00
125
dc
100
-
140
11.00
2.5
Resistance
250
dc
200
-
280
2.00
0.9
600
dc
508
-
672
0.45
0.3
48
dc
38
-
56
15.00
Electro
-
Mag
net
125
dc
100
-
140
6.25
2.5
250
dc
200
-
280
1.75
0.9
600
dc
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
5.0
8.0
Continuous
Rating
(
Amps
)
*
10.0
*
20.0
Closing
Rating
(
Amps
)
30
-
35
%
PF
or
resistive
50.0
30.0
On
drawout
breakers
,
limited
to
the
5
ampere
continuous
rating
of
#
16
gage
wire
.
16
Courtesy of NationalSwitchgear.com
SECTION
9
<
Maintenance
17
9.1
Inspection
9.2
Lubrication
9.3
Reference
Publications
17
17
9.1
INSPECTION
9.2
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
D
50
HD
38
(
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
CLOTH
TO
AVOID
ACCUMULA
-
TION
OF
DIRT
OR
DUST
On
drawout
breakers
the
contact
surface
of
the
disconnect
studs
should
be
cleaned
and
greased
with
GE
Lubricant
D
50
HD
38
.
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
(
568
B
386
G
1
)
to
the
motor
gear
reducer
shaft
on
the
front
right
side
of
the
breaker
Ratchet
the
maintenance
crank
up
and
down
until
the
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
compartment
for
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
.
Check
insulating
parts
for
evidence
of
overheating
and
for
cracks
that
indicate
excessive
thermal
aging
.
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
,
refer
to
the
following
instruction
manuals
applica
-
ble
to
the
AKR
-
75
and
AKR
-
100
breakers
.
<
GEK
-
64460
GEF
-
4552
G
El
-
86157
Maintenance
Manual
Renewal
Parts
EC
Trip
Devices
ECS
/
SST
Test
Sets
:
Cat
.
TAK
-
TS
1
.
.
.
.
Cat
.
TAK
-
TS
2
GEK
-
64454
GEK
-
73300
-
1
MicroVersaTrip
Plus
and
PM
Trip
Units
.
..
GEH
-
5891
MicroVersaTrip
Plus
and
PM
Test
Set
..
.
.
GEK
-
97307
(
17
Courtesy of NationalSwitchgear.com
Interchangeability
of
Drawout
Breakers
i
10.5
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
.
15
.
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
from
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
-
11
/
16
)
than
those
on
the
left
side
(
11
-
7
/
8
)
.
See
Fig
.
12
.
10.1
GENERAL
Low
-
voltage
switchgear
practice
requires
that
drawout
breaker
elements
of
the
same
ampere
frame
size
be
physically
interchangeable
.
Electrical
interchangeability
of
secondary
and
control
circuits
,
of
course
,
requires
duplicate
wiring
.
The
six
drawout
styles
(
AKD
,
A
,
B
,
C
,
D
&
F
)
of
the
AKR
-
75
and
-
100
models
satisfy
this
requirement
in
varying
degrees
.
The
B
,
C
,
D
and
F
types
,
being
of
more
recent
design
,
limit
interchange
-
ability
within
a
given
frame
size
to
those
units
having
the
same
voltage
rating
;
rejection
of
unwanted
types
thus
is
more
selec
-
tive
than
that
of
the
earlier
AKD
and
AKD
-
5
models
.
The
individual
interchangeability
patterns
are
illustrated
in
Fig
.
12
.
10.6
CODE
D
TYPES
The
AKR
-
75
/
100
B
,
C
,
D
,
and
F
models
are
identical
in
height
and
width
.
These
breakers
are
equipped
with
the
means
to
prevent
inadvertent
interchange
of
the
B
,
D
and
F
types
with
the
C
type
in
the
3200
and
4000
ampere
sizes
.
Interchangeability
is
identical
to
that
of
the
Code
B
type
.
10.7
CODE
F
TYPES
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
.
Interchangeability
is
identical
to
that
of
the
Code
B
type
.
10.8
“
E
-
TYPE
”
REJECTION
i
10.2
NO
-
LETTER
AKD
TYPES
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
-
lows
;
As
the
Fig
.
12
directional
arrows
indicate
,
all
AKD
ele
-
ments
are
interchangeable
within
each
frame
size
.
Considering
that
the
AKR
-
75
AKD
,
B
and
D
type
breaker
models
are
identical
in
width
and
employ
very
similar
drawout
mechanisms
,
rejection
plates
are
added
to
the
AKD
AKR
-
75
models
to
prevent
their
insertion
into
B
type
substructures
and
AKD
-
8
switchgear
.
See
Fig
.
13
.
•
E
-
type
compartments
reject
standard
breakers
.
•
Standard
compartments
accept
E
-
type
breakers
.
E
-
type
rejection
is
an
optional
feature
available
on
B
,
C
and
D
code
breakers
only
.
10.3
CODE
A
TYPES
Interchangeability
is
identical
to
that
of
the
AKD
type
.
On
Code
B
,
D
and
F
breakers
,
the
E
-
type
rejection
feature
is
provided
via
an
extra
hole
in
each
bottom
flange
engaging
corresponding
pins
added
to
the
drawout
tray
.
See
Fig
.
17
.
10.4
CODE
B
TYPES
Interchangeability
within
and
between
frame
sizes
is
pre
-
vented
by
the
rejection
system
of
Fig
.
15
.
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
.
Because
the
B
-
type
drawout
mechanism
is
nearly
identical
to
the
AKD
type
,
all
B
elements
include
additional
means
to
reject
them
from
AKD
compartments
.
An
outrigger
bracket
is
attached
to
the
right
edge
of
the
rear
frame
of
each
B
breaker
per
Fig
.
14
.
This
interfares
with
the
ramp
cam
on
the
right
wall
of
the
AKD
compartment
and
prevents
entry
of
the
B
unit
.
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
.
18
.
All
E
-
type
breakers
have
the
suffix
letter
E
added
to
the
middle
digits
of
their
designation
as
shown
by
the
following
example
:
AKR
-
4
BE
-
75
.
i
19
Courtesy of NationalSwitchgear.com
H
DRAWOUT
BREAKERS
>
FUSE
ROLLOUT
ELEMENTS
DRAWOUT
TYPE
(
25
WDc
]
[
50
WDc
)
(
60
WAc
j
I
H
4
H
H
It
H
4
AKR
-
75
4000
A
,
AKR
-
75
4000
A
.
AKR
-
75
3000
A
.
TAK
83
FCO
3000
A
.
RACKING
CAM
AKD
(
No
code
letter
)
u
I
4
•
I
FRONT
J
OF
BREAKER
H
*
t
H H
AKR
-
100
4000
A
.
TAK
94
FCO
4000
A
.
AKR
-
100
6000
A
.
AKR
-
100
6000
A
.
33
"
117
/
a
"
L
TAK
83
FCA
3000
A
.
AKR
-
75
3000
A
.
AKR
-
75
4000
A
.
AKR
-
75
4000
A
.
117
/
s
"
4
"
T
*
117
/
8
"
T
AKD
-
5
,
AKD
-
6
Code
25
"
L
4
M
4
»
AKR
-
100
6000
A
.
TAK
94
FCA
4000
A
.
AKR
-
100
6000
A
.
AKR
-
100
4000
A
.
11
%
"
I
ll
4
K
I
33
"
BREAKER
MOUNTING
PINS
AKD
-
8
H
It
H
H
1
AKR
-
75
4000
A
,
TAK
83
FCB
3200
A
.
AKR
-
75
4000
A
.
AKR
-
75
3200
A
.
Code
AKR
SUBSTRUCTURES
Deep
Escutcheon
Code
0
H
Code
H
4
H
h
H
TAK
94
FCB
4000
A
.
AKR
-
100
6000
A
.
AKR
-
100
4000
A
.
AKR
-
100
6000
A
.
25
"
L
4
TAK
83
FCC
3200
A
.
AKR
-
75
4000
A
.
AKR
-
75
4000
A
.
AKR
-
75
3200
A
.
1011
/
16
"
11
%
"
T
4
-
I
AKD
-
6
*
T
Code
_
L
M
-
LK
TAK
94
FCC
4000
A
.
AKR
-
100
4000
A
.
AKR
-
100
6000
A
.
AKR
-
100
6000
A
.
j
lO
’
Vie
"
117
/
s
"
T
-
I
4
¥
T
I
fit
the
same
Fig
.
12
Orawout
breaker
interchangeability
chart
,
plan
view
.
All
breaker
units
joined
by
compartment
.
All
others
have
unique
mounting
and
are
not
interchangeable
.
20
Courtesy of NationalSwitchgear.com
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