GE AK-50 - EC-1 Series Overcurrent Tripping Adjustments; Long Time-Delay Tripping (EC-1 Series); Instantaneous Tripping (EC-1 Series); EC-1 Series Adjustments

GEl
-
74600
Low
-
voltage
Powtr
Circuit
Breakers
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10
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11
S
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13
6
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4
mm
P
5
14
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222
m
RIGHT
Slot
VIE
*
SHOVING
LONG
TIME
DELAY
MECHANISM
Fit
.
Mb
LEFT
SIDE
V
»
£
l
SHOVING
SHORT
TIME
DELAY
MECHANISM
MG
.
24
A
L
.
T
.
D
.
17
nr
.
[
AMP
.
)
o o
\
20
FRONT
VIE
*
SHOVING
MOUNTING
BRACKET
1
.
Series
Coil
2
.
Magnet
3
.
Pallet
4
.
Pinion
5
.
Escape
Wheel
6
.
Driving
Segment
7
.
S
.
T
.
D
,
Armature
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
Series
overcurrenf
tripping
device
—
EC
-
J
(
AK
-
50
only
)
Fig
.
24
.
condition
overcomes
this
restraining
ment
is
further
retarded
by
the flow
force
,
the
armature
movement
is
fur
-
of
silicone
oil
in
adashpot
,
which
pro
-
filer
retarded by
an
escape
ment
mech
&
-
duces
an
inverse
time
delay
charac
-
nism which
produces
an
inverse
time teristic
.
The mechanism
is
shown
on
delay
characteristic
.
The mechanism
Fig
.
24
B
.
is
shown
on
Fig
.
24
A
.
LONG
TIME
-
DELAY
TRIPPING
(
Fig
.
24
)
The
armature
(
10
)
is restrained
by
the
calibration
spring
(
11
)
.
After
the
produced
by
an
overcurrent
condition
,
overcomes
the
restraining
force of
the
calibration
spring
which
can
be ad
-
(
b
)
Non
-
adjustable
instantaneous
tripping
takes
place
after
the
magnetic
force
produced
by
an
overcurrent
con
-
dition
overcomes
the
restraining
force
of
a
non
-
adjustable
spring
.
ADJUSTMENTS
(
Fig
.
24
)
Calibration
clamping
nuts
(
14
)
are
used
to
set
the
desired
pickup
for
the
adjustable
elements
.
To
adjust
for
approximately
1
/
32
-
in
.
overtravel
of
trip
arm
(
19
)
after
INSTANTANEOUS
TRIPPING
(
Fig
.
24
)
(
a
)
Adjustable
instantaneous
tripping
takes
place
after
the
magnetic
force
magnetic
force
produced
by
an
over
-
^
current
condition
overcomes
this
re
-
o fn n i nl n i
*
f
A
.
«
*
Ik
.
_
. .
A
/
1
A
\
i
..
A
.
^
J
t
_
„
IL
.
-
1
it
-
i
:
. .
t
.
u
A
.
1
.
2
—
Courtesy of NationalSwitchgear.com