GE AK-50 - Direct-Acting Tripping Devices EC-1 A and EC-1 B; Short Time-Delay Tripping (EC-1 A;EC-1 B); Overcurrent Tripping Device EC-2 Description

Low
-
voltag
•
Power
Circuit
Breakers
Gil
-
74600
r
1
.
Check
trip
latch
engagement
See
ADJUSTMENTS
-
OPERATING
ME
-
CHANISM
.
2
.
Loosen
the
locknut
*
and
turn
the
adjusting
screw
(
9
)
on
the
trip
arm
(
19
)
.
The
screw
should
not
touch
the
trip
paddle
when
the
breaker
is
"
open
"
and
the
latch
is
reset
but should
have
a
clearance
not
exceeding
1
/
32
-
in
.
3
.
Tighten
the
adjusting
screw
lock
-
nut
*
on
the
trip
arm
.
*
Note
:
In
lieu
of
locknuts
,
some
de
-
vices
are
equipped
with self
-
locking
nylon
insert
nuts
.
in
oo
Tf
6
C
1
X
(
iof
»
/
u
'
.
.
inciaic
iwi
it
:
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ifttnw
?
K
Hem
n
u
»
MTtfTtWIMS
«
1
*
•
»
r
Hull
ariKtlNM
UT
«
C
Btl
’
IfTB
n
,
l
*
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*
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'
iSj
5
IM
UH
|
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;
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K
REPLACEMENT
(
Fig
.
24
)
1
.
Remove
front
frame
(
see
SEPA
-
RATION
OF
FRONT
AND
REAR
FRAMES
)
.
2
.
Remove
the
bolts
holding
the coil
to
the lower
stud
.
2
4
3
.
Remove
bracket and
mounting
screws
.
4
.
Before
installing
a
new
device
,
check
the travel
of
the
trip
arm
with
a
rod
or
wire
and
push
the
armature
solidly
against
the
magnet
(
see
Fig
.
25
)
.
The
trip
arm
should
travel
at
least
5
/
32
-
in
.
5
.
Replace
new
device
in
reverse
order
.
6
.
Adjust
device
as
described above
.
NOTE
:
Component
parts
of
any
overcurrent
tripping
devices
are
not
replaceable
.
It
will
be
necessary
to
install
a
new
de
-
vice when
parts
are
worn
or
damaged
.
T
'
tr
O
'
o
DO
00
N
O
7
.
Ar mature
8
.
Dashpot
Arm
9
.
Connecting
Link
1
0
.
Pole Piece
1
.
Long
-
time
-
delay
and
Low
-
set
Inst
.
Calibration
Spring
2
.
Calibration
Plate
3
.
Adjustment
Knob
4
.
Time
Adjustment
Screw
5
.
Instantaneous
T
ri p
Spring
(
High
Set
)
6
.
Trip
Screw
oo
co
'
O
o
X
11
,
Movable
Nut
(
Index
Pointer
)
12
.
Inst
.
A
djusting
Sc
rew
(
High
Set
)
13
.
Oil
Da shpot
14
,
Operating
Arm
Fig
,
25
.
Checking
travel
distance
of
series
overcurrent
tripping
device
15
.
Calibration
Marks
Fig
.
26
.
Overcurrent
tripping
device
—
EC
-
2
Courtesy of NationalSwitchgear.com