GE AKR-50 Installation Manual

GEI
-
86150
-
A
TRIPPING
In
the closed
position
,
the breaker
’
s
movable
contacts
are
held
in
by
a
toggle
linkage
.
The
breaker is
tripped
open
by
displacing
a
mechanism
latch which allows
this
toggle linkage
to
collapse
.
The
trip
latch is
rigidly
fastened
to
a
horizontal
trip
shaft
running
from left
to
right through
the breaker
.
In
turn
,
the
tripshaftcarries
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 resets
the mechanism
latch
.
In
addition
to
tripping
the
breaker
,
some
devices
hold the
breaker
trip
free
,
i
.
e
.
,
prevent
the
contacts
from
closing
even
though
a
closing
impulse
is
applied
to
the mechanism
.
Such
devices
are
the
undervoltage
,
bell alarm and
lockout
,
electric
lockout
,
open
fuse
lockout
,
and
the
key
operated
locks
.
These
devices and
the drawout mechanism
interlocks
must
be
in
the
reset
position
before
the breaker
can
be closed
.
FUSED
BREAKERS
The
AKRU
-
30
/
50
type
breakers
employ
current
limiting
fused
mounted
integrally
with
the breaker
(
see
Fig
.
9
)
.
Included
is
an
open
fuse
lockout device
(
OFLO
)
to
'
prevent
single
-
phasing
in
the
event
only
one
fuse
blows
.
across
its
corresponding
fuse
.
The
arc
voltage
generated
by
a
blown
fuse
activates
its
OFLO
shunt
trip
coil
,
thereby
tripping
the breaker
and
preventing
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
acknowledged
by resetting
the
OFLO
.
The
fuse
,
of
course
,
must
be
replaced
.
The
OFLO
is
a
special
trip
device
having
three
(
3
)
shunt
trip
elements
(
one
per
phase
)
,
the coil
of
each
being
connected
MAINTENANCE
INSPECTION
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
instructions
in
their Maintenance Manual
.
(
GEK
-
64459
)
6
.
Check
insulating
parts
for
evidence
of
overheating
and
for
cracks that
indicate excessive thermal
aging
.
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
electri
-
cally
operated
breaker
may
be
performed
by
the
following
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
)
Manually
pull
the
armature
of
the
closing
solenoid
(
located behind the lower
right
-
hand
corner
of
the
escutcheon
)
toward the
front of
the breaker
.
This
dislodges
the
prop
and
allows the
closing springs
to
discharge
,
closing
the breaker
.
2
.
Electrically
operate
the breaker
several
times
to
check
performance
of
the
electrical accessories
.
LUBRSCATSGN
In
general
,
the circuit
breaker
requires
moderate lubrication
.
Bearing
points
and
sliding
surfaces
should be
lubricated
at
the
regular
inspection periods
with
a
thin
film
of GE
Lubricant
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
REMOVED
WITH
A
CLEAN
CLOTH TO
AVOID
ACCUMULATION
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
.
(
Order
part
number
193
A
1751
P
1
)
13
Courtesy of NationalSwitchgear.com

GE AKR-50 Specifications

General

Brand	GE
Model	AKR-50
Category	Circuit breakers
Language	English