Siemens GMI Series

Interrupter
/
Operator
Description
Page
13
Manual
Spring
Charging
Spring
Charging
Motor
Figure
22
shows
the
spring
charging
motor
mounted
at
the
bottom
of
the
left
side
of
the
circuit
breaker
housing
.
A
mounting
bracket
holds
the
motor
firmly
in
place
.
A
universal
motor
is
used
to
permit
operation
on
either
ac
or
dc
control
power
.
Manual
charging
of
the
closing
springs
is
accomplished
using
a
lever
in
lieu
of
the
spring
charging
motor
.
Figure
21
shows
the
principal
components
of
the
manual
spring
charging
mechanism
.
The
manual
spring
charging
lever
is
inserted
into
a
rectan
-
gular
socket
in
the
hand
operator
.
This
socket
is
accessible
through
the
front
panel
of
the
circuit
breaker
.
Moving
the
lever
up
and
down
in
a
cranking
or
pumping
motion
causes
rotation
of
the
internal
spring
charging
components
.
^
CAUTION
Manual
spring
charging
components
will
be
damaged
by
overcharging
.
h
Manual
charging
action
must
be
suspended
when
the
operator
sees
the
charged
status
appear
on
the
front
panel
of
the
circuit
breaker
and
hears
the
sound
of
impact
against
the
internal
closing
latch
.
Figure
22
.
Spring
Charging
Motor
.
The
motor
control
circuits
call
for
automatic
charging
of
the
springs
by
the
motor
whenever
control
power
is
available
and
the
springs
are
discharged
.
The
springs
automatically
recharge
following
a
closing
operation
.
Electrical
connections
to
the
motor
utilize
quick
disconnect
terminations
for
easy
inspections
or
removal
.
Close
Solenoid
,
Trip
Solenoid
and
Anti
-
Pump
Relay
Figure
23
shows
the
two
solenoids
controlling
operation
of
the
circuit
breaker
by
external
electrical
signals
.
When
the
close
solenoid
is
energized
it
causes
the
two
closing
springs
to
be
released
from
their
extended
or
charged
state
.
This
forces
the
three
insulating
push
rods
to
move
the
movable
vacuum
interrupter
contacts
vertically
upwards
,
and
close
the
circuit
breaker
.
Figure
21
.
Manual
Charging
of
the
Closing
Springs
.
Courtesy of NationalSwitchgear.com