GE AM-4.16-250-6 - Adjustments; Contact Adjustments

GEI
-
88761
Magne
-
blast
Circuit
Breaker
The
arc
chute has
a
series
of
interleaving
cer
-
amic fins
,
Figure
19
.
As
the
arc
is
forced into
the
interrupter
it
is
lengthened
in
the
gradually
deep
-
ening
serpentine
path
between
the
fins
so
that
the
electrical
resistance
of
the
arc
is
rapidly
increased
and
its
heat
is
absorbed
by
the
ceramic
material
.
The
increased
resistance
reduces the
magnitude
and
phase
angle
of
the
current
and
at
an
early
current
zero
the
arc
cannot
re
-
establish
itself
and
interruption
occurs
.
Trip
Free
Operation
If
the
trip
coil
circuit
is
energized
while
the
breaker is
closing
,
the
trip
armature
will
force
the
trip
latch
(
8
)
Figure
7
away
from
the
trip
roiier
(
9
)
causing
the
mechanism
linkage
to
collapse
and the
breaker
to
re
-
open
.
The
closing
cam
(
16
)
will
complete
its
closing
stroke and the
springs
will
re
-
charge
as
in
a
normal
closing
operation
.
ADJUSTMENTS
All
adjustments
should be checked
during
per
-
iodic
inspections
and
whenever
it
becomes
nec
-
essary
to
repair
or
replace
parts
that
have become
worn
or
defective while
in
service
.
The
following
adjustments
are
listed
in
the
order
in
which
they
are
to
be
checked
after
removing
the
box
barriers
and
front
cover
from
the breaker
.
MECHANISM
UNLESS
THE
CLOSING
SPRINGS
ARE
BLOCKED
AND
THE
OPENING
SPRINGS
HAVE
BEEN
BLOCKED
.
PREVENT
ACCIDENTAL CLOSING
OR
TRIPPING
.
TRIPPED
OPEN OR
MECHANICALLY
THIS
MEASURE
IS
REQUIRED
TO
Arcing
Contact
Wipe
DO
NOT
WORK ON
EITHER
THE
BREAKER
OR
Refer
to
Figure
9
.
Close
the
breaker
until
k
.
+
o
-
cri
-
i
,
U
-
cjS
*
"
Q
-
2
2
an
)
3
\
'
4
<
o
56
5
Primary
Contact
Wipe
Arcing
Contact
Wipe
Figure
9
A
.
"
-
6
"
&
"
-
7
"
Contact
Structure
(
114
C
5320
)
&
•
2
2
i
!
•
•
3
ll
%
-
1
4
4
7
7
Primary
Contact
Wipe
Arcing
Contact
Wipe
Figure
9
B
.
"
-
8
”
Contact
Structure
(
0132
C
2709
)
Figure
9
Contact
Adjustments
1
*
Stationary
Primary
Contacts
5
.
Movable
Arcing
Contacts
2
.
Movable
Primary
Contacts
6
.
Contact
Arm
3
.
Buffer
Block
7
.
Throat
Baffle
4
.
Stationary Arcing
Contacts
10
Courtesy of store.ips.us