GE AK-50 Series - Instantaneous Undervoltage Tripping Device; Undervoltage Lockout Device

Low
Voltage
Power
Circuit
Breakers
GEK
-
7303
The
resistance
of
the
under
voltage
coils
are
as
follows
:
C
.
relay
of
the
control
box
to
instantaneously
trip
the
breaker
through
a
normally
closed
”
Z
"
contact
in
series
with
the
undervoltage
device
mounted
on
the
breaker
.
1
.
6275081
G
-
59
-
1830
Ohms
.
2
.
6275081
G
-
61
-
440
Ohms
.
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1
.
Disconnect
coil
leads
.
=
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2
.
Remove
four
mounting
screws
(
21
)
and
remove
device
.
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3
.
Install
new
device
in
reverse
order
.
HK
TCA
r
i
Coil
(
15
)
*
A
»
Sft
:
i
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3
*
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i
V
-
4
LJ
1
.
Disconnect
leads
to
coil
.
S
TB
6
C
1
|
2
.
Remove
two
screws
(
16
)
.
3
.
Remove
magnet
and
coil
assembly
.
4
.
Straighten
laminations
around
shading
ring
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*
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(
5
)
.
200
tiVOC
5
.
Remove
shading
ring
and
straighten
lower
end
of
coil
clamp
(
13
)
.
Fig
.
24
(
102
C
3699
)
Thermotector
Wiring
Diagram
6
.
Remove
coil
.
Install
new
coil
in
reverse
order
.
"
Warning
”
:
Do
not
use
bell
set
to
check
con
-
tinuity
of
bridge
circuit
in
static
time
delay
box
,
only
a
volt
-
ohm
meter
or
vacuum
tube
volt
meter
should
be
used
.
INSTANTANEOUS
UNDER
-
VOLTAGE
TRIPPING
DEVICE
The
instantaneous
undervotage
device
is
mounted
in
the
same
location
and
manner
as
the
static
time
-
delay
device
and
its
construction
is
similar
.
The
adjustments
and
replacement
of
this
device
are
the
same
as
those
described
above
for
the
static
time
-
delay
undervoltage
device
.
In
the
event
the
device
fails
to
pick
-
up
,
the
following
checks
are
recommended
to
determine
whether
the
magnetic
device
on
the
breaker
or
the
static
time
delay
unit
is
the
faulty
component
.
Check
input
voltages
across
terminals
1
&
2
on
static
box
.
These
voltages
should
be
as
follows
:
A
.
UNDERVOLTAGE
LOCKOUT
DEVICE
(
Fig
.
25
)
1
.
Device
177
L
316
G
-
12
-
208
or
230
volts
A
.
C
.
The
undervoltage
lockout
device
holds
an
open
breaker
trip
-
free
when
the
coil
of
the
device
is
de
-
energized
.
position
,
linkage
operated
by
the
breaker
mech
-
anism
cam
positions
itself
to
mechanically
hold
the
undervoltage
device
armature
in
the
closed
air
gap
position
to
prevent
tripping
the
breaker
in
the
event
the
undervoltage
device
coil
is
de
-
energized
.
This
feature
when
used
in
conjunction
with
normally
-
closed
auxiliary
contacts
of
an
alternate
breaker
presents
a
convenient
method
of
mechanically
interlocking
two
or
more
breakers
to
assure
that
no
two
breakers
may
be
closed
at
the
same
time
.
The
undervoltage
lockout
device
is
mounted
on
the
right
side
of
the
mechanism
frame
(
7
)
(
looking
from
the
front
)
.
This
device
is
identical
to
the
standard
instantaneous
undervoltage
trip
device
*
Device
177
L
316
G
-
14
-
125
volts
D
.
C
.
2
.
When
the
breaker
is
in
the
closed
3
.
Device
177
L
316
G
-
15
-
250
volts
D
.
C
.
Check
output
voltages
on
terminals
4
&
5
with
the
under
voltage
device
connected
.
The
approximate
voltages
are
as
follows
:
B
.
208
Volt
A
.
C
.
Volts
D
.
C
.
230
Volt
A
.
C
.
177
L
316
G
-
12
-
120
D
.
C
.
Volts
D
.
C
.
125
Volt
D
.
C
.
177
L
316
G
-
14
50
Volts
D
.
C
.
177
L
316
G
-
12
-
110
1
.
2
.
3
.
250
Volt
D
.
C
.
Volts
D
.
C
.
177
L
316
G
-
15
-
100
25
Courtesy of NationalSwitchgear.com