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

I
!
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
roner
(
9
)
causing
the
mechanism
linkage
to
colla
;
and
the
breaker
to
re
-
open
.
The
closing
cam
will
complete
its
closing
stroke
and
the
springs
will
re
-
charge
as
in
a
normal
closing
operation
.
pse
(
16
)
i
i
i
'
i
ADJUSTMENTS
MECHANISM
UNLESS
THE
CLOSING
SPRINGS
ARE
BLOCKED
AND
THE
OPENING
SPRINGS
HAVE
BEEN
BLOCKED
.
PREVENT
ACCIDENTAL
CLOSING
OR
TRIPPING
.
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
.
TRIPPED
OPEN
OR
MECHANICALLY
THIS
MEASURE
IS
REQUIRED
TO
Arcing
Contact
Wipe
Refer
to
Figure
9
.
Close
the
breaker
until
DO
NOT
WORK
ON
EITHER
THE
BREAKER
OR
:
:
7
l
«
y
\
J
i
'
r
.
_
*
+
°
MIN
J
2
2
)
3
3
i
4
U
\
<
b
5
5
Primary
Contact
Wipe
Arcing
Contact
Wipe
Figure
9
A
.
"
-
6
"
&
"
-
7
"
Contact
Structure
(
114
C
5320
)
i
i
:
l
-
T
!
l
»
!
i
1
8
-
3
H
\
I
;
t
9
;
\
\
V
i
4
i
£
>
•
5
7
Primary
Contact
Wipe
Arcing
Contact
Wipe
i
?
;
Figure
9
B
.
"
-
8
”
Contact
Structure
(
0132
C
2709
)
Figure
9
Contact
Adjustments
1
.
Stationary
Primary
Contacts
5
.
2
.
Movable
Primary
Contacts
3
.
Buffer
Block
4
.
Stationary
Arcing
Contacts
Movable
Arcing
Contacts
6
.
Contact
Arm
7
.
Throat
Baffle
j
Is
10
Courtesy of NationalSwitchgear.com