Siemens GMI Series

Interrupter
/
Operator
Description
Page
14
«
i
Figure
24
.
Secondary
Disconnects
.
Electrical
connections
to
the
close
solenoid
and
trip
solenoid
are
made
through
quick
disconnect
terminations
.
Secondary
Disconnect
Signal
and
control
power
is
delivered
to
the
internal
circuits
of
the
breaker
by
an
arrangement
of
movable
contact
fingers
mounted
on
the
left
side
of
the
circuit
breaker
.
These
fingers
are
shown
in
Figure
24
.
When
the
circuit
breaker
is
racked
into
the
Test
or
Con
-
nected
positions
in
the
Metal
-
Clad
switchgear
,
these
discon
-
nect
fingers
engage
a
mating
disconnect
block
on
the
inside
of
the
switchgear
shown
in
Figure
25
.
These
electrical
connections
automatically
disengage
when
the
circuit
breaker
is
racked
from
the
Test
to
the
Disconnect
position
.
All
of
the
control
power
necessary
to
operate
the
circuit
breaker
is
connected
to
this
disconnect
block
inside
the
switchgear
.
The
external
trip
and
close
circuits
and
status
indicators
are
also
connected
to
this
same
disconnect
block
.
Figure
23
.
Close
(
Top
)
and
Trip
(
Bottom
)
Solenoids
.
The
anti
-
pump
relay
(
shown
in
Figure
55
)
electrically
iso
-
lates
signals
to
the
close
solenoid
such
that
only
one
releas
-
ing
action
by
the
close
solenoid
can
occur
during
each
application
of
the
close
command
.
The
circuit
breaker
must
be
tripped
,
the
springs
recharged
and
the
closing
signal
removed
(
interrupted
)
before
the
close
solenoid
can
be
energized
the
second
time
.
When
the
trip
solenoid
is
energized
,
it
allows
rotation
of
the
jack
shaft
by
the
tripping
spring
.
This
rotation
pulls
the
insulating
push
rods
attached
to
the
movable
contacts
of
the
three
vacuum
interrupters
,
and
the
circuit
breaker
contacts
are
opened
.
Auxiliary
Switch
Figure
26
shows
the
breaker
mounted
auxiliary
switch
.
This
switch
provides
auxiliary
contacts
for
control
of
circuit
breaker
closing
and
tripping
functions
.
Contacts
are
avail
-
able
for
use
in
relaying
and
external
logic
circuits
.
This
switch
is
driven
by
linkages
connected
to
the
jack
shaft
.
The
auxiliary
switch
contains
both
‘
b
’
(
Normally
Closed
)
and
‘
a
’
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