GE AK-50 Series - Series Overcurrent Tripping Device EC-1; EC-1 Short Time-Delay Tripping; EC-1 Long Time Delay Tripping; EC-1 Instantaneous Tripping

GEK
-
7303
Low
Voltage
Power
Circuit
Breakers
has
been
altered
by
rough
handling
or
shipment
damage
.
If
a
check
of
the
air
gap
measurement
reveals
that
the
setting
is
beyond
the
tolerance
,
the
device
should
be
returned
to
the
factory
for
recalibration
.
a
final
adjustment
that
must
be
made
is
the
length
of
the
connecting
rod
(
10
)
.
This
is
made
by
vary
-
ing
the
amount
of
thread
engagement
between
the
connecting
rod
and
the
insulated
coupling
which
ties
onto
the
trip
paddle
(
14
)
.
The
approxi
-
mate
distance
between
the
pivot
centers
on
the
ends
of
the
connecting
rod
assembly
is
six
inches
.
The
correct
exact
distance
is
that
which
will
just
cause
tripping
of
the
breaker
when
the
arm
-
ature
is
closed
to
a
point
1
/
32
in
.
short
of
contact
with
the
magnet
.
A
step
-
by
-
step
procedure
for
making
this
adjustment
follows
.
1
.
Before
mounting
the
trip
device
,
set
the
center
distance
between
the
pivot
centers
of
the
connecting
rod
at
six
inches
.
The
adjustment
screw
(
7
)
is
provided
so
that
the
short
-
time
mechanism
will
pick
up
the
trip
link
(
8
)
at
the
same
point
at
which
it
is
picked
up
by
the
long
»
-
time
mechanism
.
This
may
be
checked
before
the
device
is
mounted
by
pulling
forward
on
the
connecting
link
(
10
)
and
checking
visually
to
see
that
trip
link
(
8
)
contactsboth
theset
pin
in
the
long
time
linkage
and
the
end
of
adjustment
screw
(
7
)
.
After
the
device
is
mounted
on
the
breaker
,
18
19
-
'
p
-
/
Hr
9
&
O
D
10
8
!
MO
o
\
12
'
13
6
2
/
D
X
5
B
)
14
o
4
13
N
16
O
3
\
•
.
%
\
LEFT
SICE
VI
El
SHOWING
SHORT
TIUE
DELAY
MECHANISM
RIGHT
SIDE
VIEW
SHOWING
LONG
TIME
DELAY
MECHANISM
STTO
LT
.
0
.
17
AMP
.
LAMP
.
o
o
©
©
\
20
FRONT
VIEW
SHOWING
MOUNTING
BRACKET
Fig
.
27
(
P
-
6423678
)
Series
overcurrent
tripping
device
-
EC
-
1
(
AK
-
50
only
)
8
.
S
.
T
.
D
.
Calibration
Spring
9
.
Trip
Paddle
Adjusting
Screw
10
.
L
.
T
.
D
.
Armature
11
.
L
.
T
.
D
.
and
Low
-
set
Inst
.
Calibration
Spring
12
.
Inst
.
Trip
Spring
(
High
Set
)
13
.
Spring
Holder
14
.
Calibration
Clamp
Nut
15
.
Plunger
16
.
Cylinder
17
.
Calibration
Plate
18
.
Trip
Paddle
19
.
Trip
Arm
20
.
Clamping
Bracket
1
.
Series
Coil
2
.
Magnet
3
.
Pallet
4
.
Pinion
5
.
Escape
Wheel
6
.
Driving
Segment
7
.
S
.
T
.
D
.
Armature
28
Courtesy of NationalSwitchgear.com