GE MicroVersaTrip AK-50 User manual

GEI
-
“
MAINTENANCE
MANUAL
GFH
.
?
71
GtHA
7
\
GfH
-
li
;
GF
/
-
50
J
Gtl
-
501
GFJ
-
502
Gf
/
*
57
C
r
V
LOW
-
VOLTAGE POWER
CIRCUIT
BREAKERS
TYPES
t
-
.
AK
-
50
,
AK
-
75
,
AK
-
100
,
AKF
-
1
C
,
AKF
-
1
D
,
AKF
-
2
D
f
LOW VOLTAGE
SWITCHGEAR
DEPARTMENT
GENERAL
0
ELECTRIC
Courtesy of NationalSwitchgear.com

n
4
%
»
<
rl
Jr
•
^
CONTENTS
Page
3
INTRODUCTION
3
OPERATION
MANUAL
CLOSING
MANUAL
MAINTENANCE
CLOSING
OF
ELECTRICAL
BREAKERS
ELECTRICAL
CLOSING
ELECTRICAL
TRIPPING
3
3
3
4
4
MAINTENANCE
INSERTING
SAFETY
PIN
-
AK
-
50
,
AK
-
75
AND
AK
-
100
INSPECTION
LUBRICATION
'
SEPARATION
OF
FRONT
AND
REAR
FRAMES
.
..
.
TROUBLE
SHOOTING
4
5
5
5
6
7
BASIC
BREAKER
COMPONENTS
ARC
QUENCHERS
POLE
UNIT
ASSEMBLY
.
.
OPERATING
MECHANISMS
AUXILIARY
SWITCH
.
..
.
7
8
11
1 8
1 9
ELECTRICAL
CLOSING
DEVICES
AND
CONTROLS
CLOSING
SWITCH
CUT
-
OFF
SWITCHES
CONTROL
RELAY
19
19
19
4
PROTECTIVE
DEVICES
'
TIME
-
DELAY
UNDERVOLTAGE
TRIPPING
DEVICE
INSTANTANEOUS
UNDERVOLTAGE
TRIPPING
DEVICE
DIRECT
-
ACTING
TRIPPING
DEVICE
-
EC
-
1
DIRECT
-
ACTING
TRIPPING
DEVICES
-
EC
-
1
A
AND
EC
-
IB
SERIES
OVERCURRENT
TRIPPING
DEVICE
-
EC
-
1
SERIES
OVERCURRENT
TRIPPING
DEVICE
-
EC
-
2
(
AK
-
1
-
50
ONLY
)
REVERSE
CURRENT
TRIPPING
DEVICE
(
AK
-
50
ONLY
)
20
20
20
21
22
23
26
26
28
SELECTIVE
TRIPPING
26
BREAKER
ACCESSORIES
PRIMARY
DISCONNECTS
(
AK
-
50
ONLY
)
SECONDARY
DISCONNECTS
DRAWOUT
MECHANISM
SHUNT
-
TRIPPING
DEVICE
BELL
ALARM
AND
LOCKOUT
DEVICE
DYNAMIC
BRAKE
FOR
ELECTRICAL
BREAKERS
28
28
29
29
30
31
32
MISCELLANEOUS
.
.
.
TOOLS
RENEWAL
PARTS
32
32
17
MM
instructions
do
noI
purport
to
cover
a
/
/
dttaf
’
/
c
or
variations
in
equipment
nor
to
provide
for
every
possible
contingency
to
be
met
in
connection
with
mttatiofion
,
operation
or
mointenonce
.
Should
further
information
be
defired
or
should
particular
problems
arise
which
ore
not
covered
sufficiently
for
the
purchaserpurposes
,
the
matter
should
be
referred
to
the
General
Electric
Company
.
Courtesy of NationalSwitchgear.com

LOW
-
VOLTAGE
POWER
CIRCUIT
BREAKERS
Types
AK
-
50
,
AK
-
75
,
AK
-
100
,
AKF
-
1
C
,
AKF
-
1
D
,
AKF
-
2
D
f
1
INTRODUCTION
peciallyfor
use
in
controlling
the shunt
field
circuits
of
synchronous
motors
or
generators
.
These
breakers
are
two
-
pole
power
circuit
breakers with
field
discharge
contacts
placed
in
the
center
pole
.
Opening
of
the breaker
’
s
outer
poles
closes
the field
discharge
contacts
,
thus
connecting
a
discharge
resistor
across
the
field
of
the
genera
-
tor
or
motor
.
Type
AK
power
circuit
breakers
are
are
intended
to
impart
the
necessary
designed
for
general
use
on
all
types
of
information
required
for
proper
main
-
low
-
voltage
circuits
.
These
breakers
tenance
and
replacement
of
component
are
particularly
applicable
for
protec
-
parts
and
accessories
for
AK
-
50
,
-
75
,
tion
and
control
of
feeder
and
branch
-
lOOand
AKF
-
1
C
,
-
ID
,
-
2
Dpowercir
-
circuits
in
buildings
,
industry
,
power
cuit
breakers
.
Before
performing
any
stations
,
and
marine
applications
,
maintenance
procedures
,
the
associ
-
ated
section
(
s
)
of
these instructions
should
be
carefully
and
thoroughly
read
,
cial
type
of
AK
breaker
designed
es
-
The
instructions
contained
herein
r
The
AKF
Type
breakers
are
a
spe
-
OPERATION
NOTE
'
Mil
If
L
;
TSMT
*
*
*
"
•
'
*
*
i
i
MANUAL
CLOSING
REMOVE
JUMPERS
Ah A
3
AND
A
2
-
A 4
WHEN
ALTERNATE
WIRING
IS
USED
For
a
description
of
manual clos
-
ing
,
refer
to
the
section
of
these
in
-
structions
entitled
CLOSING
THE
BREAKER
-
MANUALLY
OPERATED
AK
-
1
-
50
and
the
section
entitled
AK
-
2
-
50
,
-
75
AND
-
100
STORED
ENERGY
MANUAL
MECHANISM
,
both
under
OPERATING
MECHANISMS
.
A
A
!
v
r
-
I f
KB
,
*
* *
f
f
-
T
3
-
KB
—
I
i
i
l
_
.
T
4
—
-
0
2
P
^
-
R
2
—
—
Sfcl
-
Jifcc
:
o
2
]
re
-
KB
—
W
4
K
:
>
r
-
vi
-
HLrJi
—
-
o
r
‘
AOOmONAL
AUK
_
L
CONTACTS
WHEN
REO
.
-
0 4
JL
D
6
L
*
8
!
E
.
SB
-
-
*
-
*
a
—
KS
—
-
o
-
o
2
-
o
Jo
-
0 4
o
o
So
0
(
0
LI
—
5
I
(
I
!
o
4
o
o
S
o
o
6
o
I
2
4
2
*
I
MANUAL
MAINTENANCE
CLOSING
OF ELECTRICAL
BREAKERS
CONNECTION
DIAGRAM
|
v
?
Kt
v
?
i
r
I
ITT
F 4 FI
FJ
T
LIC
r
43
pi
n
G
1
G
4
e
RJ
AJ
Sk
4
2
M
2
)
«
,
T
1
>
An
electrical breaker
may
be
closed
manually by
means
of
the
maintenance
handle furnished
with the breaker
.
M
*
0
I
1
R
-
(
M
TRANS
T
.
C
.
g
“
HV
yi
r
-
O
ND
vn
x
N
To
observe
the
operation
of
the
breaker
without
power
,
with the
breaker
open
and
springs
discharged
,
proceed
as
follows
:
ALTERNATE
WIRING USED
WTTM
FOLLOWING
POWER VOLTAGE
RATING
’
J
00
/
2
JO
VAC
SO
~
460
/
230
VAC
2
S
rv
46
CV
2
J
0
V
AC
50
#
v
46
CV
230
V
AC
60
rv
575
/
2
JO
V
AC
25
rv
575
/
2
JO
V
AC
50
rv
575
/
230
V
.
AC
60
rv
CUSTOMER
WIRING
FACTORY
WIRING
-
FACTORY
WIRING
FOR ENCLOSED BRKRS
CUSTOMER
WIRING
FOR
STATIONARY
BRKRS
.
1
.
Charge
the
closing
spring
with
the
maintenance
handle
(
I
,
Fig
.
3
)
until the indicator reads
Mcbarged
”
.
i
W
MX
-
ter
"
VFUSE
CLOSE
^
FUSE
AI
:
U
AS
2
.
Continue
to
operate
the mainte
-
nance
handle
until the
breaker
closes
.
P B
Bl
TWP
KV
UST
OF
ABBREVIATIONS
2
«
2
LI
KS
A
-
TERMMAL
BOARD
FRONT
VIEW
B
-
TERMINAL
BOARD
LOCATED
LEFT
WOE
FRONT
VIEW
LOCATED
LEFT
ROE
02
«
•
ALDLSW
.
3
.
Open
the
breaker
by
pushing
the
trip
button
(
5
,
Fig
.
2
)
.
J
1
uc
GI
FI
III
64
sT
Kl
>
U
\
fTWP
COIL
)
KJ
OFF SWITCHES
KB
M
2
K
-
CLOSING
RCUW
TYPE
KG
A
.
00
L
-
AUXILIARY
SW
VB
*
b
"
CONTACTS
TYPE
SB
-
12
(
AUX
.
SWJ
M
-
SHUNT
TRIP
(
TGJ
P
-
PUSH
BUTTON
CLOSING
SW
ON
0
RKR
.
I
0
B
)
R
-
CLOSING
SPRING CHARGING
MOTOR
<
M
)
T
-
AUXILIARY
POWER
TRANSFORMER
{
TRANS
)
R
ELECTRICAL
CLOSING
R
2
BJ
A
2
Figure
1
shows
the
typical
ele
-
mentary
and
connection
diagrams
for
the
control
system
of
electrically
oper
-
fitpH
hroalrovc
evranl
hroaborc whirh
ELEACNTARY DIAGRAM
^
L
-
FUSE
-
FUSE
-
<
“
)
Y
l
-
)
Y
Courtesy of NationalSwitchgear.com

GEI
-
74600
Low
-
voltage
Power
Circuit
Breakers
Mechanism
.
It
shows
the
control
cir
-
\
cult
when the
closing
springs
are
dis
-
•
charged
and
the
breaker
open
.
When
rated
voltage
is
applied
to
the
control
circuit
,
the
motor
R
(
l
-
2
)
is
en
-
ergized
through closing
relay
contacts
K
(
8
-
4
)
(
3
-
7
)
and
cutoff
switch
contacts
G
(
2
-
l
)
(
3
-
4
)
.
As
the
motor
charges
the
closing
springs
,
the
F
and
G
cutoff
switches
are
mechanically
operated
,
opening
the
G
contacts
and
closing
the
F
contacts
.
When
contacts
G
(
1
-
2
)
(
3
-
4
)
open
,
the
motor
is de
-
energized
,
with
the
closing
springs
now
in
the
’
tharged
"
position
and
ready
for
a
closing signal
.
The
indicator
on
the
front
escutcheon
will indicate the
charged
position
.
A
closing signal
now
given energizes
the
closing
relay
K
(
5
-
6
)
,
whose
con
-
tacts
K
(
8
-
2
)
(
1
-
7
)
close
,
with the
relay
being
sealed
in
by
contacts
K
(
8
-
2
)
and
F
(
4
-
3
)
.
With
the
closing
relay
ener
-
gized
and the
F
cutoff
switch
contacts
closed
,
the
motor
R
(
l
-
2
)
is
again
ener
-
gized
through
contacts
K
(
8
-
2
)
,
F
(
2
-
l
)
,
and
K
(
l
-
7
)
,
further
charging
the
clos
-
ing springs
and
causing
the
output
crank
of
the
gear
reduction
unit
to
go
over
a
top
dead
-
center
position
.
Be
-
yond
this
position
the
springs
discharge
independently
of
the
charging
motor
sand the
breaker closes
.
6
1
.
Auxiliary
Switch
Z
.
Channel
-
shaped
Bar
3
.
Position
Indicator
4
.
Relay
5
.
Manual
Trip
Button
6
.
Closing
Button
7
.
Shaft
for
Manual
Mainte
-
nance
Closing
Handle
8
.
Spring
Charged
-
Discharged
Indicator
9
.
Motor
Cut
-
off
Switches
10
.
Arc
Quencher
Froni
view
of
AK
-
J
-
50
breaker
Fig
.
2
.
ELECTRICAL
TRIPPING
rotating
the
trip
shaft and
displacing
the
trip
latch
.
When
the breaker closes
,
the
cutoff
switches
revert to
their
original
po
-
sition
and
on
release
of
the
closing
switch
,
relay
x
is
de
-
energized
and
the
motor
recharges
the
springs
to
the
pre
-
charged
position
.
On
some
models
,
an
auxiliary
switch
,
fb
"
contact
is
placed
in
the
motor
circuit
to
prevent
pre
-
charging
when the
breaker is
in
the
closed
position
.
The
breaker
may
be
tripped
elec
-
trically
by
any
of
the
electrical
trip
-
ping
devices described
in
these
in
-
structions
.
The breaker
may
also be
tripped
by
the automatic
over
cur
rent
or
reverse
current
tripping
devices
,
if
so
equipped
.
All
these devices
trip
the
breaker
in
a
similar
manner
,
i
.
e
.
the
device
trip
arm
moves
against
the
trip
paddles
fastened
on
the
trip
shaft
,
thus
The
most
commonly
used
tripping
device
is
the
shunt
trip
device
con
-
nected
in
the control
circuit
as
shown
in
Fig
.
1
.
When
a
tripping signal
is
given
,
the shunt
trip
coil
M
(
i
-
2
)
is
energized through
a
normally
-
open
auxiliary
switch
"
a
"
contact
L
(
l
-
lc
)
,
thus
tripping
the breaker
.
MAINTENANCE
BEFORE
INSPECTION
OR
ANY
MAINTENANCE
WORK IS DONE
,
BE
SURE
THAT
THE
BREAKER
IS
IN
THE
OPEN POSITION
.
ALL
ELEC
-
TRICAL
POWER
,
BOTH
PRIMARY
AND
CONTROL
SOURCES
,
SHOULD
ALSO
BE
DISCONNECTED
.
is
in
the
open
position
and
the
closing
springs
are
being
re
-
strained
by
the
safety
pin
.
The
procedure
for
inserting
the
safety
pin
is
given
below
.
INSERTING SAFETY
PIN
AK
-
50
,
-
75
and
-
100
(
Fi
9
.
3
)
The
closing spring
should
be
charged
with the
maintenance
handle
(
1
)
so
that
the
safety
pin
(
3
)
can
be
placed
in
the hole
of
the
push
rod
(
2
)
.
Con
-
tinue
to
operate
the maintenance
han
-
so
that
the
safety
pin
takes
the
spring
force
*
To
install
the
safety
pin
of
the
AK
-
2
manual stored
-
energy
mecha
-
nism
refer
to
the section
entitled
AK
-
2
STORED
-
ENERGY
MANUAL
MECHA
-
NISM
on
page
14
of
these
instructions
.
Warning
;
On
breakers
em
-
ploying
stored
-
energy
closing
mechanisms
,
care
must
be
taken
when
the
circuit
breaker
is
being
installed
and
when
any
inspection
or
maintenance
work
With
the
safety
pin
restraining
the
closing
spring
force
,
the
contacts
will
close
slowly
when
the
breaker
is
manu
-
ally
operated
allowing
the
operation
of
the mechanism and
the
contact
align
-
i
c
hAi
'
ntr
Arma
enfkaf
tKo
alar
i
nrr
tlto
Kraalrar
c
ie
+
K A
Iti
^
Iinllvv
AKP
nn
Courtesy of NationalSwitchgear.com

Low
-
voltage
Power
Circuit
Brmakors
GEI
-
74600
f
points
and
sliding
surfaces
should
be
lubricated
at
the
regular
inspection
periods
with
a
thin
film
of
G
-
E
Lubri
-
cant
D
50
H
15
.
Hardened
grease
and
dirt
should
be
removed
from
latch
and
bearing
surfaces
by
using
kerosene
.
ALL
EXCESS
LUBRICANT
SHOULD
BE
REMOVED
WITH
A
CLEAN
CLOTH
TO
AVOID
ANY
ACCUMU
-
LATION
OF
DIRT
OR
DUST
.
t
CO
lT
>
0
C
c
at
The
use
of
cotton
waste
to
wipe
bearing
surfaces
should
be
avoided
,
as
the
cotton
ravelings
may
become
entangled
under
the
bearing
surfaces
and
destroy
the
surface
of
the
bearing
.
r
On
drawout
breakers
,
the
contact
surface
of
the
disconnect
studs
should
be
greased
with
G
-
E
Grease
Specifica
-
tion
D
50
H
47
.
SEPARATION
OF
FRONT
AND
REAR
FRAMES
To
repair
or
replace
contacts
,
op
-
erating
mechanism
,
or
the
overcurrent
devices
,
the
front
frame
must
be
sepa
-
rated
from
the
back
frame
.
To
sepa
-
rate
the
two
frames
proceed
as
follows
:
1
.
The
breaker
contacts
must
be
open
with
the
safety
pin
in
place
.
(
See
MAINTENANCE
.
)
2
.
Remove
the
two
opening
springs
(
on
lower
part
of
breaker
)
from
the
outside
pole
units
.
3
.
Remove
the
clevis
pin
(
14
,
Fig
.
6
)
(
13
,
Fig
.
7
)
from
the
center
pole
unit
.
1
.
Manual
Maintenance
Handle
2
.
Push
Rod
3
.
Safety
Pin
View
showing
operation
of
AK
-
I
-
50
breaker
with
manual
maintenance
handle
and
installation
of
safety
pin
Fig
.
3
.
Following
the
inspection
period
,
the
closing
springs
must
be
recharged
,
the
safety
pin
removed
from
the
push
rod
,
and
the
pin
placed
in
the
retain
-
ing
spring
clip
adjacent
to
the
push
rod
.
spection
of
the
breaker
should
be
made
including
connections
,
contacts
and
flexible
connectors
.
(
At
all
times
it
is
important
not
to
permit
pencil
lines
,
paint
,
oil
or
other
foreign
materials
to
remain
on
the
in
-
sulating
surfaces
of
the
breaker
as
they
may
cause
low
resistance
between
points
of
different
potential
and
result
in
eventual
electrical
breakdown
.
INSPECTION
Periodic
inspection
of
the
circuit
breaker
is
recommended
at
least
once
a
year
.
More
frequent
inspections
are
recommended
if
severe
load
conditions
,
dust
,
moisture
or
other
unfavorable
conditions
exist
.
A
complete
inspec
-
tion
of
the
breaker
,
including
contacts
and
arc
quenchers
,
should
always
be
made
after
the
breaker
has
interrupted
a
short
-
circuit
.
4
.
Remove
the
six
nuts
from
the
back
frame
using
a
socket
wrench
with
an
extension
.
These
include
the
two
nuts
at
the
top
of
the
frame
.
5
.
Remove
the
auxiliary
switch
op
-
erating
rod
(
5
,
Fig
.
17
)
.
6
.
Check
along
the
trip
shaft
for
a
mechanical
interference
or
connection
between
the
overcurrent
trip
device
and
the
trip
paddles
.
Remove
mechani
-
cal
connection
if
present
,
or
if
inter
-
ference
exists
,
use
extreme
care
when
removing
or
re
-
assembling
front
and
back
frames
to
avoid
mechanical
break
-
age
of
trip
devices
.
In
reassembling
the
front
and
rear
frames
,
the
two
frames
should
be
positioned
vertically
so
that
the
trip
shaft
is
horizontally
aligned
.
The
breaker
should
be
operated
several
times
at
rated
voltage
to
as
-
sure
that
the
control
circuits
are
properly
connected
and
that
all
elec
-
trical
attachments
are
functioning
properly
.
A
complete
contact
inspection
,
in
-
cluding
contact
wipe
and
pressure
,
should
be
made
at
regular
inspection
periods
and
always
after
a
known
short
circuit
current
has
been
interrupted
,
to
determine
whether
the
contacts
are
worn
or
pitted
in
which
case
they
should
be
dressed
or
replaced
.
It
is
necessary
to
remove
the
arc
quenchers
to
properly
inspect
the
contacts
.
Arcing
contacts
and
arc
quencher
barriers
should
be
replaced
when
they
are
eroded
to
half
their
original
thickness
.
At
regular
inspection
periods
the
breaker
should
be
operated
manually
;
(
stored
energy
mechanisms
with
the
safety
pin
restraining
the
closing
spring
force
)
to
observe
the
contact
alignment
and
to
make
sure
all
mecha
-
nism
parts
move
freely
without
binding
or
excessive
friction
.
If
the
breaker
remains
open
or
closed
for
a
period
of
six
months
or
more
,
it
is
recommended
that
arrange
-
ments
be
made
to
open
and
close
it
several
times
in
succession
,
prefer
-
ably
under
load
.
NOTE
:
It
is
recommended
that
the
breaker
be
fastened
to
a
suitable
mounting
base
with
the
front
frame
supported
by
a
sling
or
hook
as
the
bolts
are
LUBRICATION
If
overheating
,
not
caused
by
over
-
current
.
is
observed
,
a
comnletp
in
-
In
general
,
the
circuit
breaker
re
-
miirAfi
mnHprnt
*
*
lnhriratinn
R
^
arino
-
Courtesy of NationalSwitchgear.com

GE
/
-
74600
Low
-
voltag
*
Powmr
Circuit
Bnakws
TROUBLE
SHOOTING
\
CAUSE
TROUBLE
REMEDY
Contacts
not
aligned
.
Contacts
dirty
,
greasy
or
coated
with
dark
film
.
Contacts
badly
burned
or
pitted
.
Current
-
carrying
surfaces
dirty
.
Overheating
Adjust
contacts
.
Clean
contacts
.
Replace
contacts
.
Clean
surfaces
of
current
-
carrying
parts
.
Relocate
or
provide
adequate
enclo
-
sure
.
Corrosive
atmosphere
.
Insufficient
bus
or
*
cable
capacity
.
Increase
capacity
of
bus
or
cable
.
Bolts
and
nuts
at
terminal
connections
not
tight
.
Tighten
,
but
do
not
exceed
,
elastic
limit
of
bolts
or
fittings
.
Current
in
excess
of
breaker
rating
.
Check
breaker
application
or
modify
circuit
by
decreasing
load
.
Excessive
ambient
temperature
.
Provide
adequate
ventilation
.
Inductive
heating
.
Correct
bus
or
cable
arrangement
.
Travel
of
tripping
device
does
not
provide
positive
release
of
tripping
latch
.
Worn
or
damaged
trip
unit
parts
.
Binds
in
overcurrent
trip
device
.
Failure
to
Trip
Re
-
adjust
or
replace
tripping
device
.
Replace
trip
unit
.
Replace
overcurrent
trip
device
.
Check
application
of
overcurrent
trip
device
.
Check
application
of
overcurrent
trip
device
.
Replace
overcurrent
trip
device
.
Overcurrent
pick
up
too
low
.
False
Tripping
Overcurrent
time
setting
too
short
.
Bind
in
overcurrent
trip
device
.
Failure
to
Close
and
Latch
Re
-
align
and
adjust
attachments
.
Binding
in
attachments
preventing
resetting
of
latch
Latch
out
of
adjustment
.
Latch
return
spring
too
weak
or
broken
.
Adjust
latch
.
Replace
spring
.
Clean
bearing
and
latch
surfaces
.
Hardened
or
gummy
lubricant
.
Safety
pin
left
in
push
rod
.
Motor
burned
out
.
Remove
safety
pin
.
Replace
motor
.
Replace
or
adjust
faulty
device
.
Faulty
control
circuit
component
.
Burned
Main
Contacts
Improper
contact
sequence
(
main
contacts
not
sufficiently
parted
when
arcing
contacts
part
)
.
Increase
arcing
contact
wipe
.
Adjust
contact
sequence
by
raising
or
lowering
main
movable
contact
pivot
block
.
Short
-
circuit
current
level
above
interrupting
rating
of
breaker
.
Requires
system
study
and
possible
replacement
with
breaker
having
adequate
interrupting
capacity
.
Loss
of
contact
wipe
or
pressure
.
Replace
stationary
contact
springs
Courtesy of NationalSwitchgear.com

Low
-
voltage
Power
Circuit
Breakers
GEI
-
74600
f
BASIC
BREAKER
COMPONENTS
1
DISASSEMBLY
—
AK AND AKF
CENTER
POLE
(
Fig
.
4
)
REPLACEMENT
—
AKF
BREAKERS
ARC
QUENCHERS
(
Fig
*
4
and
5
)
The
center
-
pole
arc
quencher
of
these breakers is similar
to
the
arc
The
following
instructions
apply
to
quenchers
of
the
standard
breakers and both the
Type
AK
and
AKF
breaker
is
replaced
in
a
similar
manner
,
except
center
poles
,
that
the breaker
must
be
closed
.
With
The
arc
quenchers
should
be
in
-
spected
at
the
regular
inspection
period
.
If
the barriers
are
cracked
or
eroded
to
one
-
half
their
original
thickness
,
they
should be
replaced
.
1
.
Remove
arc
quenchers
(
see
the breaker
closed
the
center
-
pole
contacts
are
open
and the
arc
quencher
REPLACEMENT
)
,
can
be
removed
.
r
REPLACEMENT
—
AK
BREAKERS
2
.
Remove
screws
holding
spacer
block
(
9
)
.
Replace
the
outer
-
pole
arc
quen
-
chers
of
the
Type
AKF
breaker
as
follows
;
1
.
Be
sure
the breaker is
open
.
3
.
Remove
spacer
block
,
steel
back
plate
(
8
)
,
and
compound
support
(
7
)
.
2
Remove
the channel
-
shaped
re
-
taining
bar
by
removing
two
screws
and
two
nuts
.
4
.
Rock muffler
(
6
)
slightly
and
re
-
move
.
The
inner
barriers
(
5
)
can
now
2
.
Remove
the
two
channel
-
shaped
be removed
for
inspection
,
retaining
bars which bear
against
the
front of
the
arc
quencher
by
removing
four
screws
,
two
on
each
side
.
1
.
Be
sure
the breaker
is
open
.
3
.
Lift
the
quenchers
clear
of
the
movable
arcing
contacts
.
5
.
Remove
nut
and withdraw
stud
(
1
)
.
6
.
Remove
cap
(
2
)
.
The
side
(
3
)
and
pocket
(
4
)
barriers
should
be
free
.
4
.
During
replacement
be
careful
not to
overtighten
the
screws
which
se
-
cure
the channel
-
shaped
retainingbar
.
Overtightening
the
screws
will bow
the
bar and
leave the
center
arc
quen
-
cher
loose
.
3
.
Lift
the
arc
quenchers
clear
of
the movable
arcing
contacts
.
7
.
Reassemble
and
replace
the
arc
quencher
in
the
reverse
order
.
Tighten
the
fastenings
after
replacement
.
4
.
Replace
arc
quenchers
and
in
-
sert
the
four
screws
holding
the
re
-
taining
bars
in
position
.
c
©
CO
©
CO
-
A
*
-
V
*
V
*
>
.
r
v
.
.
it
-
Y
~
.
»
i
.
I
2
3
4
5
6
7
9
8
?
.
Compound
Support
8
.
Steel
Back Plate
9
.
Spacer
Block
4
.
Pocket
Barrier
5
.
Inner
Barrier
6
.
Muffler
1
.
Stud
2
.
Cap
3
.
Side
Barrier
W
Courtesy of NationalSwitchgear.com

G
£
1
-
74600
Low
-
voltage
Power
Circuit
Breakers
1
.
Muffler
A
ssembly
2
.
Spacer
Block
3
.
Inner
Barrier
4
.
Cap
5
.
Intermediate
Barrier
6
.
Outer
Barrier
7
.
Side
Plate
Disoisemb
/
ed
ore
quenene
AKF
oufer
pc
/
c
:
DISASSEMBLY
—
AKF
OUTER
POLES
(
Fig
.
5
)
Table
1
gives
the
figures
for
contact
pressure
and
contact
wipe
.
Both
wipe
and
pressure
should
be
checked
dur
-
ing
the
regular
inspection
period
.
MEASURING
CONTACT
WIPE
(
Fig
.
6
)
1
.
Remove
arc
quenchers
(
see
RE
-
PLACEMENT
under
ARC
QUEN
-
CHER
)
.
2
.
With
the
breaker
open
,
measure
the
horizontal
distance
from
the
edge
of
the
stationary
contact
to
the
sta
-
tionary
block
behind
it
.
(
"
B
"
dim
.
for
arcing
contacts
,
"
CM
dim
.
for
main
contacts
.
)
3
.
Close
the
breaker
and
repeat
item
2
.
The
difference
between
the
readings
in
items
2
and
3
determines
the
wipe
of
the
contacts
.
For
safety
reasons
be
extremely
careful
not
to
trip
the
breaker
.
MEASURING
CONTACT
PRESSURE
(
Fig
.
6
)
1
.
Remove
arc
quenchers
(
see
RE
-
PLACEMENT
under
ARC
QUEN
-
CHER
)
.
2
.
Close
the
breaker
and
measure
dimension
"
B
"
.
3
.
Open
the
breaker
.
Place
a
push
-
type
scale
against
the
stationary
arc
-
ing
contacts
at
a
point
measured
in
line
with
the
break
between
the
con
-
tact
stop
and
the
contact
pivot
block
.
Push
the
contact
backward
until
di
-
mension
MBH
recorded
in
item
2
is
reached
.
The
scale
should
then
be
read
.
4
.
If
the
pressure
is
not
within
the
requirements
listed
on
TABLE
I
,
re
-
fer
to
the
section
of
these
instructions
dealing
with
ADJUSTING
CONTACT
WIPE
AND
PRESSURE
.
travel
of
the
contacts
.
Flexible
braid
leads
(
5
)
shunt
the
pivot
pin
to
prevent
possible
pitting
at
the
pivot
point
when
interrupting
high
currents
.
On
later
model
breakers
shunting
springs
are
used
in
place
of
braids
.
The
movable
arcing
-
contact
assem
-
bly
consists
of
parallel
contact
arms
(
4
)
carried
on
two
movable
pivot
pins
(
8
)
and
(
19
)
.
The
arcing
contacts
in
-
terleave
the
main
contacts
and
pivot
with
them
about
pin
(
19
)
.
This
rela
-
tive
motion
is
obtained
by
linkages
from
the
upper
pin
(
7
)
to
the
breaker
mechanism
.
I
,
Remove
arc
quenchers
(
see
above
)
and
lay
on
sides
on
a
flat
sur
-
face
.
2
.
Remove
hardware
from
one
side
of
arc
quencher
as
indicated
in
Fig
.
5
.
3
.
Remove
bolt
fastening
cap
(
4
)
and
barrier
plate
assembly
.
i
4
.
Barrier
plates
may
now
be
lifted
from
assembly
for
inspection
.
5
.
In
reassembling
,
make
sure
components
are
positioned
so
that
holes
for
self
-
tapping
hardware
are
in
line
.
Do
not
strip
threads
in
compound
by
overstressing
screws
.
The
stationary
main
contact
assem
-
bly
includes
main
and
intermediate
contacts
.
The
inter
mediate
-
contact
surface
extends
beyond
the
main
con
-
tacts
and
will
,
therefore
,
make
before
the
main
contacts
and
break
after
the
main
contacts
.
The
number
of
con
-
tacts
for
each
breaker
rating
is
given
in
Table
I
,
The
movable
main
contacts
pivot
around
a
stationary
pin
(
18
)
,
which
holds
them
to
the
lower
block
.
Motion
is
obtained
from
a
second
pin
(
7
)
,
con
-
nected
by
an
insulated
link
(
12
)
to
the
breaker
mechanism
.
In
addition
to
flexible
braids
shunting
the
current
from
the
contact
directly
to
the
lower
contact
block
,
steel
springs
(
17
)
force
the
contacts
against
the
pins
to
pre
-
vent
pitting
at
the
pivot
point
.
The
movable
main
contact
assembly
also
contains
main
and
intermediate
con
-
tacts
.
POLE
UNIT
ASSEMBLY
(
Fig
*
6
)
NOTE
:
The
text
and
part
iden
-
tification
numbers
contained
in
this
section
apply
to
illustra
-
tions
covering
the
AK
-
50
breaker
.
The
same
text
is
ap
-
plicable
to
the
AK
-
75
and
100
breakers
by
referring
to
Fig
.
7
and
identifying
the
similar
parts
.
These
similar
parts
may
not
,
in
every
case
,
be
iden
-
tified
by
the
same
number
.
Each
pole
unit
assembly
consists
of
a
set
of
arcing
contacts
,
a
set
of
main
contacts
,
the
actuating
linkage
and
the
mounting
base
.
See
Fig
.
8
and
9
,
pole
unit
assemblies
mounted
on
back
frame
assemblies
.
The
stationary
arcing
-
contact
as
-
sembly
consists
of
a
set
of
parallel
contact
fingers
(
2
)
,
pin
(
3
)
,
and
com
-
pression
springs
(
22
)
,
which
provide
continuous
contact
pressure
for
the
full
In
order
to
function
properly
,
a
definite
amount
of
contact
pressure
and
contact
wipe
must
exist
between
the
movable
and
stationary
contacts
.
Courtesy of NationalSwitchgear.com

Low
-
voltage
Power
Circuit
Breakers
GCI
-
74600
TABLE
I
r
-
•
*
Intermediate
Contacts
Main
Contacts
Arcing
Contacts
Pres
-
sure
in
Lbs
.
Wipe
No
.
of
Contacts
Per
Pole
Pres
-
sure
in
Lbs
.
No
.
of
Contacts
Per
Pole
Pres
-
sure
in
Lbs
.
No
.
of
Contacts
Per
Pole
Wipe Wipe
Breaker
Type
in
in
in
Inches
Inches Inches
1
/
16
to
16
/
64
to
23
/
64
55
to
65
AK
-
50
for
AC
3
55
to
65
I
2
31
to
43
*
3
/
32
1
/
16
to
16
/
64
to
23
/
64
AK
-
50
for
DC
55
to
65 3 31
to
43
3
55
to
65
1
3
/
32
r
1
/
16
to
16
/
64
to
23
/
64
AK
-
75
for
AC
35
to
45
1
35
to
45 3 31
to
43
5
*
3
/
32
1
/
16
to
16
/
64
to
23
/
64
AK
-
75
for
DC
5
35
to
45
1
35
to
45
5
31
to
43
*
3
/
32
1
/
16
to
16
/
64
to
23
/
64
AK
-
100
for
AC
AK
-
100
for
DC
25
to
35
2
25
to
35
5
*
8 31
to
43
3
/
32
16
/
64
to
23
/
64
1
/
16
to
55
to
65
1
55
to
65
2
AKF
-
1
C
(
Outside
Poles
)
3
*
31
to
43
3
/
32
AKF
-
lD
(
Outside
AKF
-
2
D
Poles
)
1
/
16
to
16
/
64
to
23
/
64
55
to
65
5
55
to
65
1
*
3
31
to
43
3
/
32
AKF
-
1
C
(
Field
AKF
-
ID
Discharge
Contacts
)
3
/
16
to
7
/
16
*
*
2
* *
10
to
16
0
0
c
*
The intermediate
contact
wipe
should be
at
least
1
/
16
in
.
greater
than main
contact
wipe
.
*
*
Left
stationary
contact
extends
approximately
3
/
32
in
.
±
1
/
32
further
than
right
hand
contact
.
least
3
/
16
in
.
,
the
main
contacts
gap
at
least
1
/
4
in
.
ADJUSTING
CONTACT
WIPE
AND
PRESSURE
(
Pig
.
6
)
NOTE
:
If
the
proper
contact
pressure
does
not
exist
when
the
contact
wipe
is
within its
limits
,
the
stationary
contacts
springs
should be
replaced
.
NOTE
:
This
check
can
best be
made
by
means
of
the mainte
-
nance
handle
,
with
the
safety
pin
restraining
the
closing
springs
.
1
.
To
obtain
proper
contact
wipe
and
pressure
on
the
center
pole
,
di
-
mension
"
A
”
should
be
increased
to
increase
wipe
and
decreased
to
de
-
crease
wipe
.
CONTACT
SEQUENCE
(
Pig
.
6
)
On
the horizontal
plane
,
the
dif
-
ference
in
the
making
of
the
arcing
contacts
on
the
same
pole
must
be
no
greater
than
1
/
32
in
.
;
the difference
between
arcing
contacts
on
separate
poles
1
/
16
in
.
If
it
is
desired
to
ad
-
vance
or
retard the
closing
of
the
main
contacts
of
a
pole
,
loosen the bolts
holding
the
adjustment
plate
(
10
A
)
of
that
pole
and
slide
plate
to
the
left
to
advance
contact
closing
,
or
to
the
right
to
retard
contact
closing
.
Make
this
adjustment
on
the
outer
poles
,
us
-
ing
the
center
pole
as
a
reference
.
Upon
retightening
adjustment
plate
bolts
,
make
sure
the
locking
tabs
are
turned
up
around bolt
heads
,
locking
the
bolts
securely
in
place
.
If
the
gap
is
under the
required
mini
-
mum
,
it
is
usually
possible
to
form
the
arcing
contacts
and
obtain
the
re
-
quired
dimensions
.
To
form
the
con
-
tacts
,
place
apiece
of
conduit
approxi
-
mately
two
feet
long
,
over
the
contact
and
form
the
contact
either
forward
or
backward
.
If
the
proper
dimensions
are
still
not
obtained
the movable
arc
-
ing
contacts
should be
replaced
.
2
.
To
change
dimension
MA
”
re
-
move
the
clevis
pin
(
14
)
and
rotate
the
clevis
as
necessary
.
3
.
To
prevent
overstressing
the
clevis threads
(
13
)
dimension
tTA
"
should
not
exceed
3
/
16
in
.
and
space
"
A
"
should
be filled
with
shims
to
0.005
in
.
of
being
solid
.
4
,
With
the
proper
center
pole
wipe
obtained
,
moving
the crossbar
adjust
-
ing
plate
(
10
A
)
on
the
center
pole
to
the
right
will
simultaneously
increase
the
wipe
on
both
outside
poles
;
moving
the
adjusting
plate
to
the
left will
have the
reverse
effect
.
If
it
has been
necessary
to
make
any
adjustments
while
obtaining
proper
contact
sequence
,
the
contact
wipe
and
pressure
must
be
checked
,
and
adjusted
,
if
necessary
.
5
,
To
increase the
wipe
on
either
outside
pole
individually
,
move
the
crossbar
adjusting
plate
of
that
pole
to
the
left
;
to
decrease
the
wipe
move
the
adjusting
plate
to
the
right
.
CONTACT
GAP
(
Fig
.
6
)
Contact
sequence
in
the vertical
plane
should
be
such
that
when the
arc
-
ing
contacts
are
just
touching
,
the
in
-
termediate
contact
gap
should
be
at
When
the breaker is
open
,
the
gap
between the movable
and
stationary
contacts
should
be
between
2
5
/
8
in
.
\
4
Courtesy of NationalSwitchgear.com

GE
/
-
74600
low
-
vo
/
foya
Power
Circuit
Broofrors
.
28
1
.
Screw
2
.
Stationary
Arcing
Contact
Pin
(
Stationary
Arcing
Contact
)
4
.
Movable
Arcing
Contact
5
.
Braid
5
A
.
Stationary
Intermediate
Contact
6
.
Movable
Main
Contact
7
.
Shouldered
Pin
Pin
(
Arcing
Contact
Link
)
Insulating
Link
Pin
(
Insulating
Link
)
10
A
,
Adjusting
Plate
11
.
Pin
(
Side
Link
)
11
A
.
Buffer
Spacers
12
.
Link
13
.
Clevis
14
.
Clevis
Pin
14
A
,
Opening
Spring
1
5
.
Lower
Stud
Pole
Unit
Base
17
.
Spring
(
Main
Movable
Contact
)
18
.
Pin
(
Movable
Main
Contact
)
19
.
Pin
(
Movable
Arcing
Contact
)
20
.
Side
Link
20
A
.
Contact
Stop
21
.
Spring
(
Stationary
Main
Contact
)
Spring
(
Stationary
Arcing
Con
-
tact
)
23
.
Upper
Stud
24
.
Pin
(
Stationary
Main
Contact
)
25
.
Stationary
Main
Contact
Screw
27
.
Screw
28
.
Stop
27
26
3
.
25
24
23
8
.
22
9
.
10
.
2
!
5
*
20
A
_
—
'
20
16
.
10
I
0
A
11
HA
12
13
22
.
14
I
4
A
26
.
)
Pole
unit
assembly
—
AK
-
50
Fig
.
6
.
and
2
3
/
4
in
.
The
gap
may
be ad
-
justed
by
varying
the number
of
buffer
spacers
(
11
A
)
on
the
cross
-
bar
.
The
locking
nuts
on
the
buffer bolts should
be locked
in
such
a
position
that
the
buffer bolt
may
be rotated
freely
.
REPLACEMENT OF
CONTACTS
(
Fig
.
6
)
Stationary
Arcing
Contacts
(
2
,
Fig
.
6
)
a
Fig
.
7
)
1
.
Remove
the
upper
plate
by
re
-
moving
two
screws
(
1
)
.
On
the
AK
-
75
and
-
100
remove
the
top
contact
block
(
25
,
Fig
.
7
)
and
remove
insulation
(
3
,
Fig
.
7
)
.
2
.
Remove
screws
from
shunting
braids
(
5
)
.
3
.
Remove
pin
(
3
)
freeing
the
sta
-
s
^
^
-
dtionary
contacts
and
springs
(
22
)
.
4
.
Install
new
springs
and
station
-
2
.
Remove
screws
(
27
)
and
remove
bracket which holds
pin
(
24
)
in
place
.
5
.
Adjust
contact
wipe
and
pres
-
(
See
ADJUSTING
CONTACT
sure
.
WIPE
AND
PRESSURE
.
)
3
.
Remove
main
-
and
intermediate
-
contact
stop
(
20
A
)
which
holds
the lower
part
of
stationary
contact
.
Removal
will
be
facilitated
if
the
force
on
the
contact
springs
(
21
)
is
neutralized
.
This
can
be
accomplished
by
operat
-
ing
the
breaker
with
the
maintenance
handle
,
with the
safety
pin
in
place
,
until
the
load
on
the
contact
stop
is
relieved
.
Movable
Arcing
Contacts
(
Fig
.
6
)
The
movable
arcing
contacts
(
4
)
should
be
replaced
when the
stationary
arcing
contacts
are
replaced
.
1
.
Separate
the
front frame
from
the
back
frame
as
described
under
SEPA
-
RATION OF
FRONT
AND
REAR
FRAMES
.
4
.
Loosen
the
hardware which
fastens
the
upper
stud
to
the
pole
unit
base
until
the
contact
-
spring
load
on
pin
(
24
)
is
relieved
.
5
.
Remove
pin
(
24
)
and
screws
(
26
)
and
lift
out
contacts
.
2
.
Remove
pins
(
8
)
and
(
19
)
and
withdraw the
contacts
.
3
,
Reassemble
parts
in
reverse
order
.
Stationary
,
Intermediate and
Main
Contacts
(
Fig
.
6
)
1
.
Remove
stationary
arcing
con
-
6
.
Reassemble
contacts
in
reverse
order
,
being
careful
to
replace
the
intermediate
contact
in
the
proper
£
4
i
-
i
_
Courtesy of NationalSwitchgear.com

Low
-
voltage
Power
Circuit
Breakers
GEI
-
74600
r
1
.
Stationary
Arcing
Contact
2
.
Pin
(
Stationary
Arcing
Contact
)
3
.
Insulation
4
.
Movable
Arcing
Contact
4
A
.
Stationary
Intermediate
Contact
5
.
Movable
Main
Contact
6
.
Shouldered
Pin
7
.
Link
8
.
Pin
(
Arcing
Contact
Link
)
9
.
Insulating
Link
10
.
Pin
(
Insulating
Link
)
1
0
A
.
Adjusting
Plate
11
.
Pin
(
Side
Link
)
12
.
Clevis
13
.
Clevis
Pin
14
.
Lowe
r
Stud
15
.
Pole
Unit
Base
16
.
Spring
(
Main
Movable
Contact
)
17
.
Pin
(
Movable
Main
Contact
)
18
.
Pin
(
Movable
Arcing
Contact
)
1
9
-
Side
Link
20
.
Spring
(
Stationary
Main
Contact
)
21
.
Spring
(
Stationary
Arcing
Contact
)
22
.
Upper
Stud
23
.
Pin
(
Stationary
Main
Contact
)
24
.
Stationary
Main
Contact
25
.
Top
Contact
Block
25
I
-
r
-
/
Q
24
-
23
22
r
21
20
19
—
18
17
16
15
M
C
!
and
11
C
.
The
closing
cam
is connected
to
the
center
-
pole
unit
through
a
clevis
and
through
a
crossbar
it
controls
the
opening
and
closing
of
the
contacts
on
all
pole
units
.
F
/
g
.
7
.
Pole
unif
assembly
—
AK
*
75
and
AK
-
J
00
Always
check
contact
wipe
and
pres
-
sure
following
contact
replacement
.
(
See
ADJUSTING
CONTACT
WIPE
AND
PRESSURE
.
)
The
electrical
operating
mechanism
of
Types
AKF
-
lCand
AKF
-
1
D
may
be
equipped
with
an
operating
mechanism
similar
to
the
standard
breaker
.
This
mechanism
can
be
quickly
recognized
by
the
presence
of
two
cut
-
off
switches
(
land
3
,
Fig
.
20
)
.
Later
Type
AKF
-
1
C
and
AKF
-
2
D
breakers
are
equipped
with
dynamic
-
brake
type
mechanisms
.
These
mechanisms
can
easily
be
identi
-
fied
by
the
presence
of
three
cut
-
off
switches
.
Refer
to
the
section
of
these
instructions
entitled
DYNAMIC
BRAKE
for
a
description
of
the
operation
and
adj
ustments
.
Movable
Intermediate
and
Main
Contacts
(
Fig
.
6
)
1
.
Remove
the movable
arcing
con
-
tacts
as
described above
.
OPERATING
MECHANISMS
2
.
Loosen
spring
(
17
)
.
3
.
Remove
braid
if
present
by
re
-
moving
screw
at
bottom
of
contact
.
ELECTRICALLY OPERATED
AK
-
50
,
-
75
and
-
100
;
MANUAL
AK
-
1
-
50
4
.
Slide
link
(
12
)
to
the
side and
off
of
pin
(
7
)
.
The
electrically
operated
mecha
-
nism includes
a
motor
and
a
gear
re
-
duction
unit
,
which
charges
the
closing
springs
(
16
,
Fig
.
10
)
through
a
crank
shaft
(
14
,
Fig
.
10
)
.
The
crank
shaft
has
an arm
with
a
roller
(
12
,
Fig
.
10
)
which
rides
on
the
closing
cam
(
2
,
Fig
.
11
)
.
The
position
of
this
closing
cam
roller is
shown
in
Fig
.
11
A
,
11
B
,
5
.
Slide
pins
(
7
)
and
(
18
)
far
enough
to
the
side
to
allow
the
movable
inter
-
mediate
contacts to
be
replaced
.
With
the breaker
open
and the clos
-
ing
springs
discharged
,
the
sequence
of
operation
is
as
follows
:
6
.
Reassemble
parts
in
reverse
order
.
Courtesy of NationalSwitchgear.com

GE
1
-
74600
Low
-
voltage
Power
Circuit
Breakers
1
.
Stationary
Arcing
Contact
2
.
Movable
Arcing
Contact
3
.
Stationary
Main
Contact
4
.
Clamp
5
.
Movable
Main
Contact
Fronf
view
of
back
frame
assembly
—
AK
-
50
6
.
Crossbar
7
.
Series
Overcurrent
Device
8
.
Movable
Intermediate
Contact
9
.
Stationary
Intermediate
Contact
1
.
Upper
Contact
Block
2
.
Stationary
Arcing
Contact
3
.
Movable
Arcing
Contact
4
.
Stationary
Main
Contact
5
.
Stationary
Intermediate
Contact
Fig
.
9
.
springs
charged
,
applying
a
closing
signal
will
cause
the
motor
to
continue
to
charge
-
the
closing
springs
allowing
the
mechanism
to
reset
,
if
not
already
reset
,
to
the
position
shown
in
Fig
.
11
B
.
6
.
Lower
Contact
Block
7
.
Movable
Main
Contact
8
.
Movable
Interme
-
diate
Contact
9
.
Crossbar
Front
view
of
back
frame
assembly
—
AK
-
10
C
handle
clockwise
to
its
normal
posi
-
tion
.
It
is
recommended
that
the
clock
-
wise
closing
stroke
be
performed
with
a
relatively
fast
-
snapping
action
to
avoid
burning
of
the
breaker
contacts
,
if
closed
under
load
.
Fig
.
S
.
“
barging
the
Closing
Springs
(
Fig
.
10
)
i
1
.
The
mechanism
in
position
is
shown
in
Fig
.
11
A
.
2
.
The
motor
turns
the
crank
(
10
)
which
is
mounted
on
the
output
shaft
of
the
gear
reduction
unit
.
The
charg
-
ing
roller
,
which
is
on
the
face
of
the
crank
,
has
paddle
arm
(
11
)
bearing
on
Tripping
the
Breoker
(
Fig
.
11
)
2
.
As
the
crank
roller
(
7
)
passes
its
top
dead
-
center
position
,
(
maxi
-
mum
spring
charge
position
)
the
clos
-
ing
springs
are
free
to
discharge
.
Crank
(
10
)
can
be
overdriven
inde
-
pendently
of
the
motor
so
that
roller
(
7
)
assumes
its
bottom
dead
-
center
position
without
restraint
.
Operation
of
any
of
the
trip
devices
rotates
the
trip
shaft
(
11
)
which
allows
the
trip
latch
(
10
)
to
release
the
latch
prop
(
5
)
.
This
allows
the
forces
of
the
contact
and
opening
springs
to
reposi
-
tion
the
operating
mechanism
linkage
to
the
position
shown
in
Fig
.
HA
.
In
this
position
,
the
operating
cycle
may
be
repeated
.
it
.
3
.
As
the
crank
turns
,
the
roller
pushes
the
paddle
arm
upward
,
there
-
by
charging
the
closing
springs
through
the
spring
charging
arm
(
15
)
of
the
crank
shaft
.
3
.
As
the
springs
discharge
,
the
rotation
of
the
crank
shaft
(
14
)
causes
roller
(
15
,
Fig
.
11
)
to
rotate
cam
(
2
,
Fig
.
11
)
and
raise
clevis
(
13
,
Fig
.
11
)
.
Prop
(
16
,
Fig
.
11
)
holds
cam
(
2
,
Fig
.
11
C
)
in
this
position
.
4
.
As
the
charging
roller
approaches
dead
center
a
cut
-
off
switch
opens
,
de
-
energizing
the
motor
circuit
.
5
,
The
breaker
is
now
ready
to
close
when
a
closing
signal
is
given
.
Adjustments
(
Fig
.
11
)
All
adjustments
should
be
made
with
the
operating
mechanism
in
the
reset
position
as
shown
in
Fig
.
11
B
.
(
The
mechanism
should
be
reset
by
manual
operation
with
the
safety
pin
in
place
.
)
4
.
Raising
clevis
(
13
,
Fig
.
11
C
)
closes
the
breaker
contacts
through
the
pole
base
linkage
.
6
.
With
the
breaker
resting
at
the
precharge
position
,
the
trip
latch
may
or
may
not
be
in
the
reset
position
.
This
depends
on
the
position
of
roller
(
15
,
Fig
.
1
IB
)
with
respect
to
the
cam
(
2
,
Fig
.
11
B
)
.
Closing
the
Breaker
Electrically
Operated
(
Fig
.
10
)
Manually
Operated
(
AK
-
1
-
50
)
1
.
The
gap
between
the
trip
latch
(
10
)
and
the
roller
(
9
)
of
the
reset
latch
should
be
between
1
/
64
in
.
and
1
/
32
in
.
This
adjustment
can
be
obtained
by
turning
screw
(
6
)
.
Functionally
,
the
manual
breaker
closing
action
is
the
same
as
the
elec
-
trical
breaker
,
except
the
resetting
action
is
accomplished
by
rotating
the
manual
closing
handle
counterclock
-
wise
to
reset
the
latch
.
The
closing
2
.
The
center
line
of
the
trip
latch
1
.
With
the
mechanism
in
the
po
-
/
*
A
\
_
t
%
J
A
%
—
\
-
.
+
Courtesy of NationalSwitchgear.com

Low
-
voltag
*
Power
Circuit
Brmakmrs
GEI
-
74600
r
1
.
Remove
the
front
frame
(
see
SEPARATION
OF
FRONT
AND
REAR
FRAME
.
)
Motor
OIK
/
Gear
-
reduction
Unit
The
motor
Is
mounted
on
the side
of
the
gear
-
reduction
unit and
through
a
worm
gear
and
a
drives
the
crank
)
ear
train
0
)
with
a
reduction
1000
:
1
.
To
remove
the
motor
and
gear
-
reduction
unit
,
proceed
as
follows
:
2
.
Remove
closing
springs
and
crank
-
shaft
as
illustrated
in
Fig
.
12
and
13
.
o
'
T
in
•
u
-
i
©
r
”
1
u
in
FIG
FIG
-
MB
MECHANISM
IN
RESET
POSITION
MECHANISM
N
MCTON
BEFORE
RESETTING AS SHOWN
IN
FIG
-
IIB
—
9
15
16
1
.
Pin
2
.
Bushing
3
.
Bracket
4
.
Indicator
5
.
Bracket
6
.
Frame
7
.
Crank
Roller
8
.
Gear
Reduc
-
tion
Unit
9
.
Motor
10
.
Crank
11
.
Paddle
12
.
Closing
Cam
Roller
13
.
Closing
Cam
Arm
14
.
Crank
Shaft
1
5
.
Spring
Charg
-
ing
Arm
16
.
Closing
Spring
17
.
Push
Rod
18
.
Clip
Fig
.
TO
.
C
/
osing
spring
and
charging
mechanism
the
roller
(
9
)
.
On
Types
AK
-
1
-
50
-
1
to
10
and
AK
-
1
-
75
-
1
to
3
breakers
,
form
the latch buffer
stop
(
14
)
to
maintain
the
adjustment
.
On
Types
AK
-
2
-
75
and
AK
-
2
-
100
breakers
,
the latch buffer
stop
is
on
the
mechanism
frame
and
can
be
adjusted
by loosening
the
re
-
taining
screws
to
reposition
the latch
buffer
stop
.
Wk
Z
3
-
i
MECHANISM
N
CLOSED
POSITION
(
CLOSING
5
PRNG
DISCHARGED
)
1
.
Spring
2
.
Cam
3
.
Link
4
.
Reset
Spring
4
A
.
Spring
Adjusting
Nuts
5
.
Prop
6
.
Adjusting
Screw
7
.
Adjusting
Screw
Stop
Pin
8
.
Prop
Return
Spring
9
.
Roller
10
.
Trip
Latch
11
.
T
rip
Shaft
12
.
Clevis
Pin
13
.
Clevis
14
.
Latch
Buffer
Stop
(
Bronze
Material
)
15
.
Roller
16
.
Prop
3
.
The
distance between the roller
on
link
(
3
)
and
prop
(
5
)
should be
be
-
tween
1
/
64
in
.
and
1
/
32
in
.
To
ob
-
tain
this
gap
,
advance
or
retard the
nuts
(
4
A
)
on
the bottom
of
the
rod
using
the
reset
spring
(
4
)
.
Replacement
When
replacing
the
operating
mecha
-
nism
,
refer
to
the
section titled
SEPA
-
RATION
OF
FRONT
AND
BACK
FRAMES
under
MAINTENANCE
in
fK
AAA
1
«
r
:
_
7
1
A
i
!
Courtesy of NationalSwitchgear.com

GEI
-
7
A
600
Low
-
voltage
Power
Circuit
Breakers
)
'
r
f
,
b
o
Rear
view
of front
frame
—
AK
-
J
-
50
showing
cam
shaft
locking
p
/
ate
being
loosened
Fig
.
12
.
Rear
view
of front frame
—
AK
-
1
-
50
showing
com
shaft
locking
plate
and
cam
shaft
removed
Fig
.
13
.
|
3
.
Disconnect the
leads
from
motor
*
and
remove
the wires attached
to
gear
unit
housing
.
first
tooth of the ratchet
wheel
(
17
)
,
thus
beginning
to
charge
the
closing
springs
.
The
subsequent
closing
han
-
dle strokes
perform
the
same
function
as
the
pawls
(
21
)
engage
the
teeth
in
the ratchet wheel
(
17
)
,
thus
rotating
the
ratchet wheel and
output
crank
(
32
)
and completely
charging
the
closing
springs
.
This
rotation
of
the
ratchet
wheel and
output
crank is
in
a
counter
-
clockwise
direction
from
the lower
po
-
sition
,
through
slightly
more
than
180
degrees
,
to
a
position
just
beyond
dead
center
.
In
this
position
the
closing
springs
are
free
to
release
their
en
-
ergy
,
closing
the
breaker
at
a
high
speed
.
nism
similar
to
the mechanism used
on
the
AK
-
2
-
50
,
-
75
and
-
100
elec
-
trical
breakers
.
The
closing
springs
(
5
)
are
charged by
operating
the manual
closing
handle
(
22
)
on
the
front of
the
breaker
,
instead
of
the
closing
motor
as
is
the
case
with the
electrical
breaker
.
Closing
this breaker
is
ac
-
complished
by
pumping
the
operating
handle
four
complete
cycles
,
first
counterclockwise
through
120
degrees
from
its
normal vertical
position
and
then clockwise back
through
120
de
-
grees
.
When
approximately
70
de
-
grees
of
the
fourth
clockwise
stroke
have
been
completed
,
the
closing
’
springs
,
which have
been
charged
dur
-
ing
the
previous
strokes
of
the
closing
handle
,
are
driven
over
-
center
and
the
breaker
closes
.
4
.
Remove
four
bolts
at
the bottom
of
the
front frame
and
one
bolt
at
top
of
gear
reduction
unit
.
The
motor
and
gear
unit
may
now
be removed
.
NOTE
:
If
it
is
desired
to
re
-
place
only
the
motor
unit
,
dis
-
connect
the
motor
leads
and
re
-
move
only
the
hardware
fasten
-
ing
it
to
the
gear
-
reduction
unit
.
When
removing
the
motor
only
,
the
front frame
should be
placed
front
side
down
to
pre
-
vent
the oil
escaping
from
the
gear
unit
.
Inserting
the
Safety
Pin
(
Fig
.
14
)
If
it
is
desired
to
slowly
close
the
breaker
contacts
to
check
contact
wipe
and
sequence
,
operate
the
closing
han
-
dle
3
1
/
2
complete
cycles
as
described
above
.
At
the end
of
the fourth
coun
-
terclockwise
stroke and
before
per
-
forming
the
fourth
clockwise
stroke
,
insert the
safety
pin
(
3
)
into the hole
(
4
)
in
the
guide
rod
(
6
)
,
thus
prevent
-
ing
the
closing
springs
(
5
)
from
releas
-
ing
their
energy
to
close
the
breaker
contacts
.
The
gear
reduction
unit contains
4
ounces
of
oil
similar
to
Atlantic
Re
-
fining
Company
’
s
Grade
HFS
No
.
3
.
It
should
not
be
necessary
to
add
or
change
oil
except
when the
gear
-
reduc
-
tion unit
and
motor
are
disassembled
.
This mechanism
consists
basically
of
a
closing spring
assembly
,
ratchet
wheel and
output
crank
assembly
,
handle
shaft
and
pawl
assembly
,
and
the
closing
handle
.
STORED
-
ENERGY
MANUAL
MECHANISM
(
Fig
.
14
)
—
AK
-
2
-
50
,
-
75
and
-
100
This
breaker
is
equipped
with
a
spring
-
charged
stored
-
energy
mecha
-
Closing
the
Breaker
(
Fig
.
14
)
The first
stroke
of
the
closing
handle
causes
the
ratchet
pawls
(
21
)
attached
to
the
handle
shaft
(
23
)
,
to
engage
the
Courtesy of NationalSwitchgear.com

Low
-
voltage
Power
Circuit
Breakers
Gil
-
74600
3
tt
r
Blsa
-
i
in
o
I
00
/
>
t
Q
,
A
\
I
O
'
sO
-
D
i
<
i
;
i
J
i
i
:
I
I
i
l
I
-
t
,
I
rh
^
-
"
4
:
i
-
•
1
/
•
<
;
V
A
7
'
V
f
,
<
I
t
i
4
4
V
V
/
"
>
.
1
>
.
15
r
h
16
i
y
t V
'
73
l
I
„
/
.
17
K
/
l
v
!
8
\
«
\
19
\
"
i
-
f
4
i
T
\
•
l
20
i
i
1
'
S
!
v
i
i
~
U
!
i
&
rr
*
J
3
22
-
L
H
-
T
*
!
J
*
23
-
M
+
24
*
1
I
25
V
;
26
Li
1
.
1
27
B
7
'
a
>
:
28
©
I
*
\
I
i
!
i
I
‘
I
(
i
/
I
^
.
.
_
1
)
L
!
5
r
u
.
%
J
si
«
*
>
IAI
v
’
iCW
WITH
WONDLC
tikp
*
iyilTrH
,
fw
^
<
^
E
»
tovEP
11
.
Output
Crank
Roller
12
.
Thrust
Bearing
13
.
Shims
14
.
Groove
Pin
15
.
Nylok
Screw
16
.
Ratchet
Wheel Shaft
and
Asm
.
26
.
Pawl
Buffer
Stop
27
.
Buffer
Stop
Shims
28
.
Buffer
Stop Support
29
.
Handle
Return
Spring
30
.
Mechanism
Roller
32
.
Output
Crank
21
.
Ratchet Pawl
6
22
.
Manual
Closing
Handle
23
.
Closing
Handle
Shaft
and Pawl
Asm
.
24
.
Roll
Pin
1
.
Upper
Spring
Pin
2
.
Safety
Pin
Holder
3
.
5
afety
Pin
and
Chain
4
.
Safety
Pin
Hole
5
.
Closing
Springs
6
.
Guide
Rod
7
.
Pawl
Springs
8
.
Front
Escutcheon
9
.
Front
Bearing
Plate
10
.
Bearing
Plate
Mounting
Bolts
31
.
Lower
Spring
Pin
r
25
.
Main
Closing
Crank
17
.
Ratchet
Wheel
1
*
8
.
Side
Plate
Shims
19
.
Side
Plate
Mounting
Bolts
20
.
Bearing
Side
Plate
Sfored
-
energy
manual
closing
mec
/
tamim
charged
position
—
AK
-
2
Fig
.
14
.
Courtesy of NationalSwitchgear.com

GEI
-
74600
Low
-
voltage
Power
Circuit
Breakers
in
.
should
exist
between the
front of
the
groove
pin
and the
rear
surface of
the
Nylok
screw
head
.
Replacement
(
Fig
.
14
)
If
it
is
necessary
to
replace
any
of
the
mechanism
parts
,
the
following
total
procedure
is
recommended
.
This
procedure
may
be halted
at
the
step
required
to
replace
any
particular
part
:
FIELD
SWITCH
Other
adjustments
to
the
closing
and
operating
mechanisms
,
such
as
complete
contact
and latch
adjustments
,
may
be made
by following
the
pre
-
viously
described
instructions
for
the
AK
-
50
,
-
75
and
-
100
breaker mecha
-
nisms
.
FIELD
DISCHARGE
CONTACTS
DISCHARGE
RESISTOR
1
.
Install
the
safety
pin
(
3
)
as
de
-
scribed
above
.
FIELD
WINDING
mim
AKF
MECHANISM
(
Fig
.
16
)
2
.
Separate
the
front
and
rear
frames
as
described
under
’
’
SEPARA
-
TION
OF FRONT
AND
REAR
FRAMES
”
in
the
’ ’
MAINTENANCE
”
section
of
these
instructions
.
Fig
.
75
.
Typica
/
connection
diagram
NOTE
:
When
reassembling
the
mechanism
,
the
adjustments
listed below
should
be checked
at
the
appropriate
time
of
re
-
assembly
.
The
appropriate
time
for
each
adjustment
is
in
-
dicated
in
the
adjustment
text
.
The
Type
AKF
breakers
are
two
-
pole
breakers with field
discharge
contacts
placed
in
the
center
pole
.
When
this breaker
is
opened
,
the field
discharge
contacts
close
,
thus
con
-
necting
an
external
discharge
resistor
across
the field
of
the
generator
or
motor
.
When
the breaker
is
closed
,
the field
discharge
contacts
are
opened
.
See
Fig
.
15
for
a
typical
circuit
con
-
nection
.
3
.
Remove
the
closing
spring
as
-
sembly
by
removing
the
upper
and
lower
spring
pins
(
1
,
31
)
.
4
.
Remove
the
right
hand
bearing
side
plate
(
20
)
,
and
the
side
plate
shims
(
18
)
if
present
,
by
removing
four
mount
-
ing
bolts
(
19
)
,
thus
allowing
the
main
closing
crank
(
25
)
to
be
removed
.
Adjustments
(
Fig
.
14
)
Frequent
adjustments
to
the
mech
-
anism should
not
be
required
.
If
the
mechanism
has been
disassembled
,
it
will
be
necessary
to
check the
follow
-
ing
adjustments
:
When
the
breaker
is
tripped
,
the
opening
springs
pull
crossbar
(
9
)
down
-
ward
,
opening
the breaker
'
s
outer
poles
.
As
the
crossbar
moves
down
-
ward
,
link
(
A
)
rotates
about
a
fixed
center
(
17
)
,
collapsing
toggle
links
(
B
)
and
(
C
)
upward
,
thereby closing
cen
-
ter
-
pole
contacts
through
connecting
link
(
D
)
.
Link
(
C
)
consists
of
two
links
riveted
together
,
forming
a
single
tri
-
angular
link
.
5
.
Remove
the
closing
handle
(
22
)
by
removing
two
set
screws
threaded
in
same
hole
.
1
.
It
may
be
necessary
to
add shims
(
13
)
to
reduce the
end
play
of
the
rat
-
chet
wheel
shaft
(
16
)
.
An
end
play
of
0.010
to
0.020
of
an
inch
is
recom
-
mended
.
Shims
should
be
obtained
from
the
factory
.
6
.
Remove
the
front
escutcheon
by
removing
four
screws
holding
it
to
the
front frame
center
support
.
7
.
Remove
the handle
return
spring
(
29
)
by unhooking
either end
of
the
spring
.
2
.
It
may
be
necessary
to
add
buf
-
fer
stop
shims
(
27
)
to
the buffer
stop
(
26
)
to
provide
a
clearance
of
1
/
64
to
1
/
32
inch between the
pawls
(
21
)
and
the buffer
stop
,
when the
pawls
are
touching
the ratchet wheel teeth
ex
-
tending
a
maximum
distance
from
the
center
of
rotation
of
the ratchet
wheel
(
17
)
.
This
measurement
should be
made while
operating
the
closing
han
-
dle
during
the
four
spring
charging
op
-
erations
and
before
the
closing
springs
are
reassembled
.
Contact
Adjustments
8
.
Disconnect the
top
end
of
each
pawl
spring
(
7
)
.
Maaturamanft
For
contact
measurements
and
ad
-
justments
of
the
two
outside
poles
of
the
breaker
,
refer
to
POLE
UNIT
ASSEMBLY
.
9
.
Remove
the roll
pin
(
24
)
,
thus
allowing
the
closing
handle
shaft
(
23
)
and
pawl
assembly
(
23
)
to
be removed
.
10
.
Remove
the
ratchet wheel
(
17
)
and
its
assembly
(
16
)
by
removing
Nylok
*
screw
(
15
)
and thrust bearing
(
12
)
.
If
shims
(
13
)
are
present
they
must
also be
removed
.
Contact
measurements
of
the
cen
-
ter
-
pole
field
discharge
contacts
should
be made
on
the left
contact
and be with
-
in
the
following
limits
:
3
.
The ratchet
pawls
(
21
)
should
op
-
erate
freely
throughout
the
closing
strokes
.
They
should
engage
the
rat
-
chet
wheel
teeth
near
the end
of
each
counterclockwise
and clockwise stroke
of
the
closing
handle
with
a
definite
clicking
sound
,
indicating
a
free
non
-
binding
operation
.
After
the
clicking
sound
is
detected
,
the
closing
handle
should have
a
minimum overtravel
of
1
/
2
in
.
or
3
1
/
2
degrees
,
measured
at
the
end
of
each handle
stroke
.
1
.
Contact
wipe
,
3
/
16
in
.
to
7
/
16
11
.
Re
move
front
bearing
plate
(
9
)
by
removing
three
mounting
bolts
(
10
)
ac
-
cessible
from
the
front of
the breaker
.
The
mechanism
is
now
completely
dis
-
assembled
.
It
is
not
recommended
that
any
of
the
subassemblies
removed dur
-
ing
the
above
operation
be further
dis
-
assembled
in
the
field
.
Replacement
sub
-
assemblies
should
be
obtained
from
the
factory
.
in
.
2
.
Contact
pressure
,
101
b
.
to
16
lb
.
3
.
Gap
between
contacts
when
cen
-
ter
pole
is
open
,
11
/
2
in
.
to
1
3
/
4
in
.
4
.
Overlap
between the
center
-
pole
contacts
and the
arcing
contacts
of
the
outer
poles
,
3
/
16
in
.
to
7
/
16
in
.
12
.
To
reassemble the
mechanism
,
reverse
the
procedure
described
above
.
4
.
The
groove
pin
(
14
)
in
the
front
of
the
ratchet wheel
assembly
(
16
)
must
be assembled
in
a
manner
that
will
al
-
low
Nylok
screw
(
15
)
to
be
tightened
Measurements
of
the
center
-
pole
contact
wipe
and
pressure
may
be
made
by
following
the
same
procedure
as
outlined
for
the standard
pole
unit
Courtesy of NationalSwitchgear.com

Low
-
voitay
Powtr
Circuit
Breakers
GH
-
74600
NOTE
:
If
the
above
adj
ustment
has
been
made
,
it
i
6
necessary
to
recheck
the
outer
-
pole
wipe
.
IfthiB
is
outside
the
prescribed
limits
,
correct
as
described
in
POLE
UNIT
ASSEMBLY
.
r
»
4
.
If
proper
wipe
cannot
be
obtained
within
the
range
of
the
adjustment
de
-
scribed
above
,
it
will
be
necessary
to
obtain
further
adjustment
by
means
of
the
vertical
shims
(
14
)
provided
for
the
purpose
.
In
order
to
accomplish
this
,
proceed
as
follows
:
l
r
~
r
\
r
*
"
0
^
0
r
*
10
a
.
Separate
the
front
frame
from
the
back
frame
(
see
SEPARATION
OF
FRONT
AND
REAR
FRAMES
)
.
17
16
b
.
Loosen
screw
(
13
)
and
remove
bolt
(
15
)
.
c
.
Remove
vertical
shims
(
14
)
to
decrease
wipe
;
add
to
increase
.
15
d
.
Replace
bolt
(
15
)
and
tighten
screw
(
13
)
.
e
.
Reassemble
front
and
back
frame
.
Ad
jutting
Center
-
pole
Open
Contact
Gap
(
Fig
.
16
)
Improper
open
contact
gap
of
the
center
pole
may
be
adjusted
by
the
following
procedure
.
13
14
6
.
Movable
Contact
7
.
Pin
8
.
Buffer
9
.
Crossbar
10
.
Adjusting
Plate
11
.
Bolt
12
.
Buffer
13
.
Screw
1
.
Springs
2
.
Insulation
3
.
Stationary
Contact
4
.
Pin
5
.
Screw
14
.
Shims
15
.
Bolt
16
.
Pin
17
.
Pin
1
.
Loosen
screw
(
13
)
and
bolt
(
15
)
.
Field
discharge
contacts
(
center
po
/
ej
Adjusting
Conter
-
pole
Contact
Wipe
and
Overlap
(
Fig
.
16
)
Fig
.
16
.
of
the
center
-
pole
contacts
and
the
outer
pole
arcing
contacts
may
be
checked
by
the
following
procedure
:
2
.
If
gap
is
to
be
increased
,
hori
-
zontal
shims
(
14
)
should
be
removed
.
If
it
is
to
be
decreased
,
they
should
be
added
.
Shims
may
be
removed
by
If
measurements
reveal
either
in
-
sliding
them
to
the
front
of
the
breaker
,
correct
center
-
pole
contact
wipe
or
They
are
slotted
for
easy
removal
,
incorrect
overlap
of
contacts
,
adjust
-
(
Effect
of
this
adjustment
on
contact
mentfi
should
be
made
by
the
following
wipe
and
overlap
is
negligible
.
)
procedure
:
1
.
Remove
arc
quenchers
(
see
ARC
QUENCHER
)
.
2
.
Insert
safety
pin
in
push
rod
.
(
See
Fig
.
3
under
MAINTENANCE
.
)
3
.
Tighten
hardware
.
1
.
With
outside
poles
open
,
loosen
adjustment
plate
(
10
)
of
center
pole
on
crossbar
(
9
)
by
freeing
bolt
locking
tab
Contact
Replacement
and
loosening
bolts
(
11
)
.
3
.
Operate
closing
mechanism
with
maintenance
handle
until
arcing
con
-
tacts
of
outer
poles
just
touch
.
r
Stationary
Contacts
(
Fig
.
16
)
2
.
If
center
-
pole
wipe
or
overlapis
to
be
increased
,
move
the
adjustment
plate
to
the
left
;
if
it
is
to
be
decreased
,
move
it
to
the
right
.
1
.
Remove
arc
quencher
(
see
ARC
QUENCHER
)
.
4
.
Measure
distance
between
for
-
ward
edge
of
left
stationary
contact
of
center
pole
and
surface
of
insulation
block
behind
contact
.
2
.
Remove
screw
(
5
)
from
braid
.
3
.
After
proper
adjustment
is
made
,
tighten
adjustment
plate
bolts
until
plate
is
snug
.
Then
tap
adjustment
plate
in
such
a
way
as
to
bring
lower
edge
of
slot
in
plate
to
bear
against
bolt
.
Tighten
bolt
until
lockwasher
is
fully
compressed
.
Then
form
locking
tabs
over
bolt
heads
so
that
bolts
are
3
.
Drift
out
pin
(
4
)
and
remove
con
-
5
.
Continue
to
operate
maintenance
closing
handle
until
center
-
pole
contact
opens
fully
.
tacts
.
4
.
Reassemble
in
reverse
order
with
new
contacts
.
"
3
6
.
Repeat
measurement
described
in
step
4
.
Difference
between
meas
-
5
.
Check
contact
overlap
and
wipe
-
-
V
Courtesy of NationalSwitchgear.com

GEI
-
74600
Low
-
voltage
Power
Circuit
Breakers
Movable
Confects
(
Fig
.
16
)
1
.
Remove
arc
quencher
(
see
ARC
QUENCHER
)
.
8
I
-
16
V
9
\
15
7
2
7
D
;
s
)
10
§
s
'
i
3
N
2
.
Remove
tru
-
arc
retainers
on
right
side
of
pins
(
7
)
and
(
16
)
.
3
.
Drift
pins
(
7
)
and
(
16
)
to
the
left
far
enough
to
free
movable
contacts
.
i
3
II
o
J
)
12
*
»
-
14
0
i
4
V
3
)
>
4
V
.
13
j
4
.
Reassemble
in
reverse
order
with
new
contacts
.
6
5
13
.
'
b
1
Contacts
14
.
’
b
'
Terminals
15
.
‘
a
*
Terminals
16
.
Barrier
9
.
Contact
Spring
10
.
Rocker
Arm
11
.
Pin
12
.
Cam
5
.
Check
contact
overlap
and
wipe
and
readjust
if
necessary
(
see
above
)
.
5
.
Bottom
Cover
6
.
End
Plate
7
.
Top
Cover
8
.
'
a
'
Contacts
Fig
.
18
.
Auxiliary
switch
—
standard
breaker
1
.
Mounting
Bolt
2
.
Tie
Bolt
3
.
Shaft
4
.
Screw
AUXILIARY
SWITCH
AK
BREAKERS
(
Fig
.
17
)
4
.
Set
arrow
on
new
auxiliary
switch
The
top
terminals
of
the
switch
are
"
a
”
contacts
(
open
when
the
breaker
is
open
)
and
the
bottom
terminals
areMb
”
contacts
(
closed
when
the
breaker
is
open
)
.
shaft
.
The
auxiliary
switch
is
used
to
make
and
break
various
control
cir
-
cuits
as
the
circuit
breaker
is
opened
and
closed
.
5
.
Push
auxiliary
switch
shaft
(
8
)
into
square
hole
in
link
(
breaker
open
)
.
6
.
Replace
mounting
hardware
and
wiring
.
The
auxiliary
switch
is
mounted
on
the
left
side
of
the
front
frame
.
As
the
crossbar
(
4
)
moves
,
with
the
con
-
tacts
,
to
the
open
or
closed
position
it
operates
a
triangular
link
(
6
)
through
an
operating
rod
(
5
)
.
The
triangular
link
rotates
the
operating
shaft
(
8
)
of
-
the
auxiliary
switch
,
which
,
through
cams
located
on
this
shaft
,
opens
and
closes
the
auxiliary
switch
contacts
.
Replacement
(
Fig
.
17
)
1
.
Disconnect
all
leads
to
auxiliary
switch
.
Adjustment
(
Fig
.
17
)
The
"
a
"
contacts
of
the
auxiliary
switch
should
close
before
the
arcing
contacts
of
the
breaker
close
.
This
may
be
checked
by
slowly
closing
the
2
.
Remove
two
mounting
bolts
.
3
.
Disengage
auxiliary
switch
shaft
(
8
)
from
the
triangular
link
(
6
)
.
9
BREAKER
OPEN
8
7
6
BREAKER
1
.
Pin
2
.
Switch
Mounting
Bolt
3
.
Auxiliary
Switch
Shaft
4
.
Crossbar
5
.
Operating
Rod
6
.
Link
7
.
Bolt
8
.
Link
9
.
Locknut
10
.
Link
11
.
Triangular
Link
12
.
Link
t
-
/
2
\
,
CLOSED
—
.
5
-
re
{
/
.
7
.
OPEN
i
)
3
4
/
r
1
.
Frame
2
.
Open
and
Closed
Indicator
3
.
Front
Escutcheon
4
.
Crossbar
5
.
Operating
Rod
6
.
Triangular
Link
7
.
Link
8
.
Operating
Shaft
9
.
Auxiliary
Switch
I
*
Courtesy of NationalSwitchgear.com

Low
-
voltage
Power
Circuit
Breakers
Gtl
-
74600
r
2
.
Remove
mounting
hardware
at
(
2
)
and
(
7
)
.
breaker
with
the
maintenance
handle
,
with
the
safety
pin
restraining
the
clos
-
ing
springs
,
and
with
a
bell
set
across
the
"
a
”
terminals
of
the
auxiliary
switch
.
ferent
from
that
of
the
standard
AK
breakers
.
Figures
17
and
19
show the
difference
in
the
mounting
positions
,
with
the
AKF
switches rotated
90
de
-
grees
with
respect
to
the
mounting
po
-
sition
of
the standard breaker
switch
.
There
is
also
a
slight
difference
be
-
tween
the
linkage
ct
the
AKF
breaker
switches
,
however
the
principle
of
op
-
eration
remains the
same
.
3
.
Withdraw
auxiliary
switch
.
4
.
Insert
new
switch
with
arrow
on
shaft
pointing
up
and towards
the
back
of
the
breaker
as
in
Fig
.
17
.
The
closing
of
the
"
a
"
contacts
can
be
advanced
or
retarded
by
extending
or
reducing
the
external
length
of
the
operating
rod
(
5
)
.
The
length
of
the
operating
rod
(
5
)
should be
adjusted
so
that
the switch
"
a
"
contacts
close when
the
arcing
contacts
are
parted
by
1
/
8
to
1
/
4
in
.
The
operating
rod should
also be
aligned
vertically
so
that
it
is
parallel
with
the
sides
of
the
breaker
frame
center
channel and
perpendicu
-
lar
with the crossbar
(
4
)
.
This
align
-
ment
may
be
secured
by
relocating
the
washers
on
the
pin
which
connects
the
operating
rod
to
the crossbar
.
5
.
Replace
mounting
hardware and
wiring
.
When
the
breaker
operates
,
the
movement
of
the
crossbar
(
4
)
rotates
triangular
link
(
11
)
about fixed
center
(
1
)
.
This
rotational
motion
is
trans
-
mitted
to
the
auxiliary
-
switch shaft
(
3
)
by
the
linkage
comprised
of
links
(
10
)
,
(
8
)
and
(
6
)
.
The breaker
posi
-
tion
indicator
is
also
operated
by
this
mechanism
through
link
(
12
)
.
r
Adjustments
(
Fig
.
19
)
The
auxiliary
switch
operating
rod
(
5
)
should be
adjusted
so
that
the switch
"
a
"
contacts
close
when the
arcing
con
-
tacts
of
the
outer
poles
are
parted
by
1
/
8
to
1
/
4
in
.
This
dimension
may
be
checked
in
the
same manner
described
for
the standard breakers
.
The
length
of
the
operating
rod
may
be
varied
by
changing
dimension
"
a
"
(
see
Fig
.
19
)
and
aligning
the
operating
rod
as
de
-
scribed
for
the
standard
breakers
.
AKF
BREAKERS
(
Fig
.
19
)
Replacement
(
Fig
.
19
)
The
auxiliary
switch
mounting
and
linkage
on
the
AKF
breakers
are
dif
-
1
.
Disconnect
all
leads
to
auxiliary
switch
.
ELECTRICAL
CLOSING
DEVICES
AND
CONTROLS
A
closing
switch
and
motor
mecha
-
nism
are
provided
for
closing
the
breaker
electrically
.
springs
and
through
the
operating
rod
(
4
)
,
thus
opening
switch
(
1
)
contacts
and
closing
switch
(
3
)
contacts
.
This
opens
the
motor
circuit until
a
closing
signal
is
given
.
When
a
closing
signal
is
given
the
motor
is
energized
through
switch
(
3
)
contact
,
further
charging
the
closing
springs
and
closing
the
breaker
.
When
the
breaker
closes
,
the
cut
-
off
switch
is
again
mechanic
-
ally
operated
,
reverting
to
its
origi
-
nal
position
with switch
(
1
)
contact
now
closed
and switch
(
3
)
open
,
thereby
allowing
the
motor to
charge
the
clos
-
ing springs
for
a
subsequent
closing
operation
.
fl
con
H
=
:
m
2
CLOSING
SWITCH
-
r
.
3
The
closing
button
,
when
provided
,
is
mounted
on
the
front
escutcheon
.
When
the
closing
button is
pressed
in
-
ward
it
engages
a
rod which
in
turn
operates
a
switch
,
which is mounted
on
the
front frame
to
the
right
of
the
operating
mechanism
.
c
-
IT
—
ITI
8
t
o
*
VJ
r
'
!
®
'
g
r
\
l
6
t
®
/
:
7
h
V
-
«
£
To
replace
the
closing
switch
,
dis
-
connect
the
wiring
and
remove
the
nuts
which hold
the
switch
to
its
mounting
bracket
.
5
If
the switches
do
not
function
prop
-
erly
,
they
should
be
replaced
by
dis
-
connecting
the
wiring
and
removing
them
from
their
mounting
bracket
.
f
L
_
4
CUT
-
OFF SWITCHES
(
Fig
.
20
)
The
motor
cut
-
off
switches
are
mounted
on
the
side
of
the
front frame
.
When
the
breaker
control
circuit is
energized
the
motor
circuit
is
main
-
tained
through
the
closed
contacts
of
switch
(
1
)
,
thus
charging
the
closing
springs
.
At
the
end
of
the
charging
stroke the
cut
-
off
switch is mechani
-
cally
operated
by
the
charging
of
the
CONTROL
RELAY
The
control
relay
is mounted
on
the
left
side
of
the
front frame
.
It
is used
to
open
and
close the
motor
circuit
.
To
replace
remove
wiring
and
holding
screws
.
Refer
to
Fig
.
1
for
control
relay
circuit connections
.
1
.
'
G
'
Switch
2
.
Insulation
3
.
’
F
1
Switch
4
.
Rod
5
.
Retaining
Ring
6
.
Lever
Bracket
7
.
Mounting
Bracket
8
.
Cover
Fig
.
20
.
Motor
col
-
off
switch
Courtesy of NationalSwitchgear.com

GEI
-
74600
Low
-
voltage
Power
Circuit
Breakers
PROTECTIVE
DEVICES
\
TIME
-
DELAY
UNDERVOLTAGE
TRIPPING
DEVICE
(
Fig
.
21
)
When
any
time
delay
of
3
to
10
sec
-
onds
exists
from
loss
of
voltage
,
the
device
is
considered
satisfactorily
ad
-
justed
.
This
device
is
factory
set
,
non
-
adjustable
in
the
field
.
2
.
Remove
two
screws
(
16
)
.
3
.
Remove
magnet
and
coil
as
-
sembly
.
This
device
is
mounted
to
a
bracket
on
the
leftside
of
the
operating
mecha
-
nism
(
looking
from
the
front
)
.
The
purpose
of
this
device
in
to
trip
the
breaker
,
if
desired
,
when
certain
undervoitage
conditions
exist
.
For
rated
voltage
,
the
armature
(
3
)
is
at
-
tracted
by
the
magnet
(
14
)
.
If
the
volt
-
age
falls
below
the
predetermined
value
the
magnet
(
14
)
releases
the
armature
(
3
)
.
Spring
(
4
)
then
pulls
armature
(
3
)
upward
against
the
restraining
force
of
the
oil
in
cylinder
(
10
)
;
this
action
causes
a
minimum
time
delay
of
three
seconds
.
When
the
spring
overcomes
the
restraining
force
of
the
oil
,
the
armature
engages
screw
(
20
)
thus
ro
-
tating
the
trip
shaft
and
opening
the
breaker
.
4
.
Straighten
laminations
around
shading
ring
(
5
)
.
From
1
/
4
in
.
to
3
/
8
in
.
of
oil
should
be
maintained
in
the
cylinder
at
all
times
.
In
order
to
make
an
inspection
of
the
oil
,
the
cylinder
may
be
un
-
screwed
from
the
cap
.
G
-
E
silicone
oil
9981
LT
40
NV
or
similar
grade
should
be
used
in
the
cylinder
.
5
.
Remove
shading
ring
and
straighten
lower
end
of
coil
clamp
(
13
)
.
6
.
Remove
coil
.
Install
new
coil
in
reverse
order
.
REPLACEMENT
(
Fig
.
21
)
INSTANTANEOUS
UNDER
-
VOLTAGE
TRIPPING
DEVICE
(
Fig
.
21
)
Device
1
.
Disconnect
coil
leads
.
The
instantaneous
undervoitage
de
-
vice
is
mounted
in
the
same
location
and
manner
as
the
time
-
delay
device
.
Its
construction
is
similar
to
the
time
-
delay
device
with
the
exception
of
the
time
-
delay
feature
.
The
omission
of
this
feature
eliminates
the
cylinder
(
10
)
,
plunger
(
12
)
,
connecting
rod
(
11
)
,
clevis
(
7
)
,
bracket
(
1
)
,
and
adjusting
nut
(
8
)
from
the
device
.
2
.
Remove
two
screws
from
bracket
(
1
)
.
(
Bracket
is
omitted
when
instan
-
taneous
undervoitage
device
is
used
.
)
ADJUSTMENTS
(
Fig
.
21
)
An
adjusting
screw
(
20
)
in
the
trip
lever
is
used
to
allow
from
1
/
32
in
.
to
1
/
16
in
.
overtravel
after
tripping
the
breaker
.
3
.
Remove
four
mounting
screws
(
21
)
and
remove
device
.
4
.
Install
new
device
in
reverse
order
.
Adjusting
screw
(
2
)
and
spring
(
4
)
:
are
used
to
adjust
the
armature
so
that
it
will
pick
up
at
80
percent
of
normal
voltage
and
drop
out
between
30
percent
and
60
percent
of
normal
voltage
.
The
adjustments
and
replacement
of
this
device
are
the
same
as
those
de
-
scribed
above
for
the
time
-
delay
under
-
voitage
device
.
Coil
(
15
)
1
.
Disconnect
leads
to
coil
23
Oft
.
-
O
22
.
)
o
21
dx
\
A
2
20
O
I
O
o
2
o
o
3
o
o
4
o
gr
19
3
18
4
17
5
o
1
o
o
2
o
o
3
o
J
2
—
o
4
o
-
v
6
ii
cu
I
[
:
'
8
8
—
•
r
~
n
.
.
O
9
16
-
j
|
—
050
10
i
m
1
;
Q
6
°
1
o
B
12
O
11
15
14
!
3
U
.
V
17
.
Pin
13
.
Clamp
14
.
Magnet
15
.
Coil
16
.
Screws
23
.
Supporting
Bracket
1
.
Bracket
2
.
Adjusting
Screw
and
Nut
3
.
Armature
4
.
Spring
5
.
Shading
Ring
6
.
Pin
7
.
Clevis
9
.
Cap
10
.
Cylinder
11
.
Connection
Rod
12
.
Plunger
22
.
Trip
Paddle
and
Clamp
18
.
Adjusting
Screws
19
.
Locking
Wire
20
.
Adjusting
Screws
8
.
Adjusting
Nut
21
.
Mounting
Screws
Time
-
c
/
e
/
av
undervo
/
faae
triooino
dmvic
*
FiQ
.
21
.
Courtesy of NationalSwitchgear.com