GE AM-4.16-250-6 - Mechanism and Switch Adjustments

Magne
-
blast
Circuit
Breaker
GEI
-
88761
This
can
be
the
arcing
contacts
just
touch
,
determined with the
use
of
a
circuit
continuity
tester
such
as
a
light
indicator
or
bell
set
.
In
H
this
position
,
the
gap
between the
stationary
primary
*
contacts
(
1
)
and
the movable
primary
contact
(
2
)
should
be
5
/
16
"
or
greater
.
This
setting
has
been
made
in
the
factory
and
no
adjustment
is
provided
.
A
wipe
of
less
than
5
/
16
"
is
an
indication
that
the
arcing
contacts
need
to
be
replaced
.
When
making
this
check
,
see
that
the
movable
arcing
contact
(
5
)
passes
between
the
probes
on
the
upper
arc
runner
without
touching
.
On
the
"
-
8
"
design
,
also
check
for
clearance
between the
arcing
contact
(
5
)
and
the slot
in
the throat baffle
(
7
)
during
entire stroke
of
the
moving
contact
assembly
.
Primary
Contact
Gap
Refer
to
Figure
10
.
With
the breaker
closed
,
press
the
manual
trip
button
allowing
the breaker
to
trip
open
normally
.
Do
not
force
the
contacts
open
wider
by
hand
.
The
gap
between
the
stationary
primary
contacts
(
5
)
and
the
movable
primary
con
-
tact
(
8
)
measured
between
the
closest
points
,
should
be
3
5
/
8
"
to
3
15
/
16
"
.
To
change
this
gap
,
loosen
the
check
nut
(
17
)
Figure
7
,
and
turn
the
adjusting
nut
(
18
)
on
stud
(
19
)
.
Screwing
the
adjusting
nut
down
will decrease
the
primary
contact
gap
.
Tighten
the
check
nut
and
re
-
measure
the
contact
gap
(
close
and
trip
the
breaker
before
checking
the
measurement
)
.
Whenever
the
primary
contact
gap
is
changed
,
the
primary
contact
wipe
should
be
rechecked
and
,
if
necessary
,
readjusted
.
WHEN
WORKING
ON
THE
MECHANISM
IN
THE
CLOSED
POSITION
,
KEEP
FINGERS
CLEAR OF
THE
LINKAGE
,
AS
ACCIDENTAL
TRIPPING
CAN
CAUSE
SEVERE
INJURY
.
Trip
Latch
Wipe
Refer
to
Figure
7
.
The
wipe
of
the
trip
latch
(
8
)
on
the
trip
roller
(
9
)
should
be
from
3
/
16
"
to
l
/
4
"
.
This
can
be measured
by
putting
a
film
of
grease
on
the
latch
(
8
)
,
closing
the
breaker
part
way
,
and
tripping
.
The mechanism
has the
proper
trip
latch
wipe
when the latch
rests
against
the
stop
pin
(
23
)
.
No
adjustment
is
provided
and
a
visual
inspection
is
usually
all
that
is
required
.
If
this
setting
is
not correct
,
look
for
insufficient
travel
of
the
trip
shaft
(
7
)
.
Trip
Armature
Travel
Refer
to
Figure
7
.
The
trip
armature
(
4
)
should
have
7
/
32
"
to
9
/
32
"
travel before
the
trip
latch
(
8
)
starts to
move
.
This
can
be
adjusted
by
moving
the
trip
coil
support
(
2
)
and
/
or
by
adjusting
the
trip
armature
screw
(
12
)
Figure
11
.
A
locking
screw
located
behind the
trip
armature
^
crew
must
first be loosened
.
Retighten locking
screw
after
making
adjustment
.
Release Latch
Wipe
}
Primary
Contact
Wipe
Refer
to
Figure
9
,
when
the
breaker
is
closed
the
stationary
primary
contacts
(
1
)
should
rise
from
1
/
4
"
to
5
/
16
"
.
Before
checking
this dimen
-
sion
be
sure
the
mechanism
is
re
-
set
so
that
the
prop
pin
(
13
)
Figure
7
is
resting
on
the
prop
.
.
To
obtain
the
proper
contact
adjustment
,
open
the
breaker and
,
referring
to
Figure
10
,
loosen
the
check
nut
(
4
)
and
turn
the
adjusting
nut
(
3
)
.
Screw
-
ing
up
on
the
adjusting
nut
will
decrease
the
primary
contact
wipe
,
down
will
increase
it
.
Tighten
the
check
nut
,
close
the breaker and
recheck
the
wipe
.
With
the
primary
contact
wipe
correctly
adjusted
,
the clearance
between the
contact
arm
(
6
)
Fig
-
ure
9
and the buffer block
(
3
)
should be
1
/
16
"
or
greater
when the breaker
is
fully
closed
.
Refer
to
Figure
6
.
The
wipe
between the
release
latch
(
8
)
and
roller
(
6
)
should be
3
/
16
"
to
1
/
4
"
.
If
re
-
setting
is
required
,
loosen
,
set
,
and
re
-
tighten
adjustment
nut
and
screw
(
10
)
.
Release
Latch
Monitoring
Switch
Refer
to
Figure
6
.
The
release
latch
must
be
fully
re
-
set
and
the latch
monitoring
switch
(
13
)
operated
before the
motor
will
start
.
When
the
latch
is
fully
reset
the clearance
between
the switch
striker
arm
and
the switch
mounting
bracket
(
14
)
is
1
/
32
"
or
less
,
this
can
be
adjusted
by bending
the striker
arm
.
Figure
10
.
(
8039618
)
Adjustable
Coupling
For
Making
Primary
Contact
Wipe
Adjustments
1
.
Operating
Rod
2
.
Operating
Rod
Pin
3
.
Adjusting
Nut
4
.
Check
Nut
5
.
Stationary
Primary
Contacts
6
.
Yoke
7
.
Contact
Arm
8
.
Movable
Primary
Contacts
Motor
and
Relay
Switches
Refer
to
Figure
6
.
With
the
closing
springs
blocked
rotate
the switch
cam
(
2
)
until the switch
11
Courtesy of NationalSwitchgear.com