Siemens GMI Series

Overhaul
This
mechanism
can
be
identified
by
observing
the close
latch
above the
spring
charging
motor
on
the
left
side
of
the circuit
breaker
.
Refer
to
Figure
18
a
.
The close
latch is installed
on
the
close
shaft
assembly
72
,
and includes
a
hardened latch
face
.
This
face
contacts
a
bearing
which is
part
of
the
close hatchet
assembly
105
.
If
the mechanism
has
aclose hatchet
which
bears
directly
on
the close
shaft
,
refer
to
the
next
section
for
replace
-
ment
of
the
trip
latch
reset
switch
for
your
mechanism
The
trip
latch
reset
check
switch
(
LS
3
)
is
mounted
on
the
trip
shaft
actuator
stop
plate
,
as
shown
in
Figure
43
a
.
To
replace
this switch
,
the
trip
shaft
actuator
must
be
removed
by backing
out two
#
10
-
32
hex socket
screws
,
and then
removing
two
3
/
8
“
nuts
which
secure
the
trip
shaft
actuator
stop
plate
to
the
mechanism
.
Wires
to
the
switch
must
be marked
and removed
.
The
stop
plate
and switch
may
then
be
removed
as
a
subassembly
.
The
switch is
a
bushing
type
,
for
panel
mounting
,
and threads into
the
stop
bracket
.
After
adjustment
,
it
is secured
by
a
jam
nut
and
locking
nut
.
Adjustment
requires
the
trip
of
the switch
plunger
to
be
set
0.06
-
0.09
"
ahead
of
the
stop
bracket
tab
,
as
illustrated
in
Figure
43
a
.
Secure
the switch
,
position
the
stop
bracket
assembly
,
and reattach the wires
.
Install the
3
/
8
"
nuts to
secure
the
trip
shaft
actuator
stop
plate
to
the mechanism
.
Remount
the
trip
shaft
actuator
.
Confirm
that
the
switch is
vertically aligned
to
ensure
that
it
will
not
be struck
by
the
closing
hatchet
or
the
trip
shaft
actuator
.
This
mechanism
can
be
identified
by
observing
the close latch
above
the
spring
charging
motor
on
the
left
side
of
the circuit
breaker
.
Refer
to
Figure
18
b
.
The
close
hatchet
22
has
a
latch
face
which bears
directly
on
the close
shaft
72
.
If
the
close
hatchet
includes
a
bearing
which
contacts
a
hardened
latch
installed
on
the
close
shaft
,
refer
to
the
preceding
section
for
replacement
of
the
trip
latch
reset
switch
for
your
mechanism
.
The
trip
latch
reset
check switch is
mounted
to
the
left
(
when
facing
the
front of
the beaker
)
vertical
mechanism side sheet
as
shown
in
Figure
43
b
.
The
switch
is held
in
place
by
two
screws
.
When
replacement
of
the
trip
latch
reset
check switch
is
required
,
both
screws
need
to
be
removed
.
Next
,
mark both
wires
to
the
switch
,
and
remove
them
.
Then
replace
the
switch
,
rewire
and
reassemble the
switch
to
the
left
hand mechanism side sheet
.
Be
sure
to
use
the
same
washer
and
nut
configuration
as was
present
in
the
as
-
shipped
condition
.
Replacement
of
Spring
Dump
Switch
(
Device
LS
4
) (
Figure
Replacement
of
LS
3
-
Up
to
Mid
-
1991
The
following
paragraphs
describe
replacement
of
the
trip
latch
reset
switch
for
the mechanism used
beginning
in
ap
-
proximately
mid
-
1991
.
Figure
43
a
:
Trip
Latch Reset
Switch
(
LS
3
) (
From
mid
-
1991
to
present
)
.
Figure
42
:
Motor
Cut
-
Off
Switch
(
LS
1
)
and
Spring
Charged
Switch
(
LS
2
)
.
Figure
43
b
:
Trip
Latch Reset
Switch
(
LS
3
)
(
From
1989
to
mid
-
1991
)
.
29
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