GE AK-50 Series - Electrical Closing Devices and Controls; Protective Devices; Static Time Delay Undervoltage Tripping Device

Low
Voltage
Power
Circuit
Breakers
GEK
-
7303
AKF
BREAKERS
(
Fig
.
20
)
The
auxiliary
switch
mounting
and
linkage
on
the
AKF
breakers
are
different
from
that
of
the
standard
AK
breakers
.
Figures
17
and
19
show
the
difference
in
the
mounting
positions
,
with
the
AKF
switches
rotated
90
degrees
with
respect
to
the
mounting
position
of
the
standard
breaker
switch
.
There
is
also
a
slight
difference
between
the
linkage
of
the
AKF
breaker
switches
,
however
the
principle
of
operation
remains
the
same
.
When
the
breaker
operates
,
the
movement
of
the
crossbar
(
4
)
rotates
triangular
link
(
11
)
about
fixed
center
(
1
)
.
This
rotational
motion
is
trans
-
mitted
to
the
auxiliary
-
switch
shaft
(
3
)
by
the
linkage
comprised
of
links
(
10
)
,
(
8
)
and
(
6
)
.
The
breaker
position
indicator
is
also
operated
by
this
mechanism
through
link
(
12
)
.
Replacement
(
Fig
.
20
)
through
the
operating
rod
(
4
)
,
thus
opening
switcn
(
1
)
contacts
and
closing
switch
(
3
)
contacts
.
This
opens
the
motor
circuit
until
a
closing
signal
is
given
.
When
a
closing
signal
is
given
the
motor
is
energized
through
switch
(
3
)
contact
,
further
charging
the
closing
springs
and
closing
the
When
the
breaker
closes
,
the
cut
-
off
switch
is
again
mechanically
operated
,
reverting
to
its
original
position
with
switch
(
1
)
contact
now
closed
and
switch
(
3
)
open
,
thereby
allowing
the
motor
to
charge
the
closing
springs
for
a
sub
-
sequent
closing
operation
.
Most
breakers
have
two
normally
open
auxiliary
contacts
in
series
with
the
motor
circuit
to
prevent
pre
-
charging
the
closing
springs
with
the
breaker
closed
.
If
the
switches
do
not
function
properly
,
they
should
be
replaced
by
disconnecting
the
wiring
and
removing
them
from
their
mounting
bracket
.
breaker
.
1
.
Disconnect
all
leads
to
auxiliary
switch
.
2
.
Remove
mounting
bolts
(
2
)
and
(
7
)
.
3
.
Withdraw
auxiliary
switch
.
4
.
Insert
new
switch
with
arrow
on
shaft
point
-
ing
up
and
towards
the
back
of
the
breaker
as
in
Fig
.
18
.
5
.
Replace
mounting
hardware
and
wiring
.
Adjustments
(
Fig
.
20
)
The
auxiliary
switch
operating
rod
(
5
)
should
be
adjusted
so
that
the
switch
"
a
"
contacts
close
when
the
arcing
contacts
of
the
outer
poles
are
parted
by
1
/
8
to
1
/
4
in
.
This
dimension
may
be
checked
in
the
same
manner
described
for
the
standard
breakers
.
The
length
of
the
operating
rod
may
be
varied
by
changing
dimension
"
a
"
(
see
Fig
.
19
)
and
aligning
the
operating
rod
as
described
for
the
standard
breakers
.
n
con
IU
3
Li
n
2
:
:
r
~
K
3
IT
—
8
7
m
6
;
@
/
/
:
/
•
5
IL
.
4
ELECTRICAL
CLOSING
DEVICES
AND
CONTROLS
Fig
.
21
(
242
C
599
)
Motor
cut
-
off
switch
5
.
Retaining
Ring
6
.
Lever
Bracket
7
.
Mounting
Bracket
8
.
Cover
A
closing
switch
and
motor
mechanism
are
provided
for
closing
the
breaker
electrically
.
1
.
'
G
'
Switch
2
.
Insulation
3
.
’
F
'
Switch
4
.
Rod
CLOSING
SWITCH
The
closing
button
,
when
provided
is
mounted
on
the
front
frame
behind
the
escutcheon
.
A
hole
is
provided
in
the
escutcheon
to
allow
operation
of
the
switch
,
to
the
switch
.
CUT
-
OFF
SWITCHES
(
Fig
.
21
)
The
motor
cut
-
off
switches
are
mounted
on
the
side
of
the
front
frame
.
When
the
breaker
control
circuit
is
energized
the
motor
circuit
is
main
-
tained
through
the
closed
contacts
of
switch
(
1
)
,
thus
charging
the
closing
springs
.
At
the
end
of
the
charging
stroke
the
cut
-
off
switch
is
mechanically
operated
by
the
charging
of
the
springs
and
CONTROL
RELAY
The
control
relay
is
mounted
on
the
left
side
of
the
front
frame
.
It
is
used
to
open
and
close
To
replace
,
remove
wiring
and
holding
screws
.
See
item
3
,
Fig
.
2
.
Remove
the
escutcheon
to
gain
access
the
motor
circuit
.
PROTECTIVE
DEVICES
STATIC
TIME
DELAY
UNDER
.
VOLTAGE
TRIPPING
DEVICE
(
Fig
.
22
)
The
Static
Time
Delay
Undervoltage
Tripping
23
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