GE AK-50 - EC-2 Device Replacement and Adjustments; EC-2 Device Replacement; Reverse Current Tripping Device AK-50; Reverse Current Tripping Device Adjustments

Low
-
voltage
Power
Circuit
Breakers
Gil
-
74600
r
the
armature
counterclockwise
.
The
calibration
spring
also
tends
to
rotate
the
armature
in
the
same
direction
.
This
torque
causes
the
armature
to
rest
against
the
stop
screw
(
12
)
attached
to
a
bearing
plate
on
the
right
side
of
the
device
.
r
-
'
r
-
fi
Sr
-
1
<
H
)
.
r
ir
-
i
i
-
-
V
-
"
'
I
J
14
rr
If
the
current
through
the
series
coil
(
2
)
is
reversed
,
the
armature
(
10
)
tends
to
move
in
the
clockwise
direc
-
tion
against
the
restraint
of
the
cali
-
bration
spring
(
6
)
.
When
the
current
reversal
exceeds
the
calibration
set
-
ting
,
the
armature
revolves
clockwise
causing
the
trip
rod
(
3
)
to
move
upward
engaging
the
trip
paddle
(
l
)
,
thereby
tripping
the
breaker
.
\
i
\
2
TOP
OF
TRIP
R
00
{
3
)
r
u
13
2
B
me
K
"
1
3
ADJUSTMENTS
(
Fig
.
28
)
4
The
only
adjustment
to
be
made
on
the
reverse
current
device
is
to
make
sure
that
the
trip
rod
has
a
minimum
overtravel
of
1
/
32
in
.
beyond
the
point
of
tripping
the
breaker
.
This
adjust
-
ment
should
have
to
be
made
only
when
an
old
device
is
being
replaced
by
a
new
one
.
iTi
r
-
a
LTI
'
N
)
12
5
M
6
The
new
device
will
be
factory
ad
-
justed
so
that
the
top
end
of
the
trip
rod
(
3
)
will
extend
1
/
2
in
.
above
the
top
of
the
device
case
,
and
no
addi
-
tional
adjustments
of
the
trip
rod
should
be
required
.
To
obtain
the
proper
1
/
32
-
in
.
overtravel
,
close
the
breaker
and
proceed
as
follows
:
8
/
10
i
.
.
_
r
/
1
.
Loosen
the
locking
nut
(
26
)
.
u
v
9
2
.
Manually
lift
the
trip
rod
and
vary
the
position
of
the
adjusting
nut
(
2
A
)
,
thus
establishing
the
position
of
the
adjusting
nut
where
the
breaker
is
just
tripped
.
1
.
T
rip
Paddle
2
.
Series
Coil
2
A
.
Adjusting
Nut
2
B
.
Locking
Nut
3
.
T
rip
Rod
4
.
T
rip
Crank
5
.
Setting
Sealing
Screw
Calibration
Spring
7
.
Potential
Coil
.
8
.
Calibration
Nut
9
.
Pole
Pieces
10
.
Armature
11
.
Counter
Weight
12
.
Stop
Screw
13
.
Mounting
Screw
14
.
Scre w
<
+
)
CM
t
O
'
NO
—
I
tr
>
4
A
A
<
I
A
<
*
*
i
*
NOTE
:
Be
sure
to
keep
clear
of
moving
breaker
parts
when
tripping
the
breaker
.
oo
C
I
o
o
2
o
o
3
o
04
o
—
i
V
l
AUXSW
6
.
B
%
3
.
With
this
position
of
the
adjust
-
ing
nut
established
,
advance
the
ad
-
justing
nut
upward
one
and
one
-
half
turns
.
o
I
o
0
2
o
o
3
o
c
4
o
0
5
0
M
i
:
*
o
«
r
C
$
2
-
—
L
3
3
4
.
Tighten
the
locking
nut
and
the
minimum
1
/
32
-
in
.
overtravel
of
the
trip
rod
should
be
obtained
.
R
.
G
.
—
B
6
Fig
.
26
.
The
reverse
current
tripping
de
-
vice
(
see
Fig
.
28
)
consists
of
a
series
coil
(
2
)
with
an
iron
core
mounted
be
-
tween
two
pole
pieces
(
9
)
,
also
a
po
-
tential
coil
(
7
)
connected
across
a
con
-
stant
source
of
voltage
and
mounted
around
a
rotary
-
type
armature
(
10
)
.
Reverse
current
tripping
device
armature
pick
-
up
when
a
reversal
of
current
occurs
.
REPLACEMENT
(
Fig
.
28
)
After
removing
the
wiring
for
the
As
long
as
the
flow
of
current
through
potential
coil
the
reverse
current
de
-
the
breaker
is
in
the
normal
direction
,
vice
can
be
removed
and
replaced
by
the
magnetic
flux
of
the
series
coil
and
following
the
procedure
outlined
for
the
magnetic
flux
of
the
potential
coil
replacing
the
series
over
cur
rent
de
-
_
_
i
—
/
/
*
\
1
i
.
1
*
>
Q
_
111
Al
A
„
J
—
A
.
_
-
.
A
-
A
—
—
-
r
;
<
»
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