GE AK-50 Series - Power Sensor Component Replacement; Power Sensor Unit Replacement; Trip Solenoid Replacement

Low
Voltage
Power
Circuit
Breakers
GEK
-
7303
Fig
.
33
(
8039646
)
Magnetic
Coil
Assembly
for
AK
-
3
75
,
100
Breakers
(
Only
)
(
Mounted
on
Assembly
Fixture
)
1
.
Power
Sensor
Coil
Assembly
2
.
Transformer
Taps
in
Ampere
3
.
Disconnect
Plug
to
either
terminal
at
remote
C
.
T
.
and
check
to
assure
the
shield
is
continuous
from
Power
Sensor
Plug
to
remote
C
.
T
.
by
checking
for
continuity
between
R
and
A
.
exist
,
shield
is
not
continuous
and
the
point
of
discontinuity
must
be
found
.
Check
the
control
disconnect
as
the
possible
point
of
discontinuity
.
Remove
jumper
at
remote
C
.
T
.
after
shield
con
-
tinuity
is
established
.
Note
the
polarity
marks
on
the
ground
sensors
.
Be
sure
the
external
ground
C
.
T
.
senses
the
neutral
current
associated
with
the
particular
breaker
load
current
and
that
polarity
marks
are
in
ac
-
cordance
with
Fig
.
40
.
If
the
breaker
bottom
studs
connect
to
the
source
,
the
external
C
.
T
.
must
also
have
its
polarity
mark
toward
the
source
.
4
.
Terminal
Board
5
.
External
Ground
Sensor
Lead
1
and
5
during
overcurrent
test
.
The
above
considerations
should
indicate
which
of
the
four
major
components
is
faulty
and
in
need
of
replacement
.
If
continuity
does
not
now
REPLACEMENT
OF
POWER
SENSOR
COMPONENTS
Power
Sensor
Unit
(
Fig
.
35
)
Loosen
screw
connecting
the
unit
to
the
1
.
front
frame
.
2
.
Slide
unit
forward
.
3
.
Remove
control
plug
by
alternately
loosen
-
ing
the
two
retaining
screws
.
4
.
Replace
in
reverse
order
.
Trip
Solenoid
(
Fig
.
36
)
1
„
Remove
opening
springs
2
.
Raise
cross
bar
to
gain
additional
access
TESTING
MAGNETIC
COILS
After
the
PST
-
1
Test
Kit
has
been
used
to
deter
-
mine
the
adequacy
of
performance
of
the
Power
Sensor
Unit
and
the
Power
Supply
Unit
,
it
may
be
advisable
or
required
to
test
the
magnetic
coils
by
the
use
of
a
Hi
-
current
-
Low
voltage
type
test
set
.
In
this
event
only
one
test
per
phase
need
be
made
.
This
test
should
be
made
at
some
convenient
multi
-
ple
of
pick
-
up
setting
such
as
3
X
current
setting
for
comparison
with
published
time
-
current
curves
.
In
the
event
the
breaker
is
equipped
with
ground
sensor
,
the
ground
sensor
will
cause
tripping
on
single
pole
testing
unless
the
signal
is
shorted
at
the
terminal
board
Fig
.
(
40
)
.
Short
point
room
3
.
Remove
two
nuts
holding
device
to
bracket
4
.
Remove
wiring
cleats
and
connections
to
terminal
board
on
Power
Supply
to
free
the
trip
solenoid
for
removal
35
Courtesy of NationalSwitchgear.com