GE AM-4.16-250-9 - INSTALLATION; DESCRIPTION OF OPERATION

GEK
-
41902
Magne
-
blast
Circuit
Breaker
INSTALLATION
1
.
Remove
the
box barrier and mechanism
cover
and
make
a
visual
inspection
to
as
-
certain
that
the
breaker
and
mechanism is
in
satisfactory
condition
.
Check
all
bearing
surfaces
of
the
mechanism
for
lubrication
.
Refer
to
section
on
lubrication
page
16
and
Figure
17
.
2
.
Charge
the
breaker
closing
springs
man
-
ually
using
a
5
/
8
"
ratchet wrench
to turn
the
driving
eccentric
(
6
)
Figure
1
.
Turning
the
eccentric
counter
clockwise
will
advance
the
ratchet wheel and
compress
the
springs
.
When
the
springs
have reached the
fully
charged
position
the
indicator
(
1
)
will
read
"
CHARGED
"
,
and the
driving
pawl
will
be
raised
from
the
ratchet
wheel
teeth
.
Ad
-
ditional
turning
of
the
eccentric
will
not
advance the ratchet wheel
.
OR
MECHANISM
UNLESS
THE
CLOSING
SPRINGS
ARE
BLOCKED
AND
THE
OPEN
-
ING
SPRINGS
HAVE
BEEN
TRIPPED
OPEN
OR
MECHANICALLY
BLOCKED
.
THIS
PRECAUTION
IS
REQUIRED
TO
PREVENT
ACCIDENTAL
CLOSING
OR TRIPPING
.
The
closing
springs
should
now
be
un
-
blocked
.
Rotate
the
driving
eccentric
until
the
indicator
reads
"
CHARGED
"
and
the
ratchet
wheel
does
not
advance
.
The
spring
blocking
device
can
now
be
removed
.
w
:
a
3
.
Connect
the
test
coupler
to
the
circuit
breaker and
operate
it
electrically
several
times
.
Check
the
control
voltage
as
de
-
scribed under
"
CONTROL
POWER CHECK
"
(
Page
14
)
.
Disconnect
the
test
coupler
and
replace
box
barrier
.
4
.
Insert
the
spring
blocking
device
(
10
)
and
manually discharge
the
springs against
the
pins
by pushing
the
manual release button
(
4
)
.
The
springs
are
now
blocked and
slow
closing
of
the
breaker
contacts
can
be
acco
ecce
If
the breaker
has
been
stored
for
a
long
period
of
time
,
it
is
recommended
that
the insulation be
checked
with
a
standard
60
hertz
high
potential
test
.
Insulation
Test
(
Page
16
)
.
5
.
Refer
to
mplished
by
again turning
the
driving
ntric
with
a
5
/
8
"
ratchet wrench
.
During
the
slow
closing
operation
check
to
insure
that
the mechanism
does
not
stick
or
bind
during
the
entire stroke
,
that
it
latches
securely
in
the
closed
position
,
and
that
it
trips
freely
when the
manual
trip
lever
is
operated
.
At
this
time
,
also check
the
following
adjustments
:
a
.
Arcing
contact
wipe
(
Refer
to
page
10
)
b
.
Primary
contact
wipe
(
Refertopage
11
)
c
.
Primary
contact
gap
(
Refer
to
page
11
)
If
the breaker
secondary
wiring
NOTE
:
is
to
be
given
a
hi
-
potential
test
at
1500
volts
,
remove
both
the
motor
leads
from
the
terminal
connection
.
Failure
to
dis
-
connect
the
motor
from
the circuit
may
cause
damage
to
the
winding
insulation
.
6
.
Lubricate
the silver
portion
of
the
ball
contact
at
the
top
of
the
breaker
bushing
and
the
rear
portion
of
the
ground
shoe
,
by
apply
-
ing
a
thin
film
of
contact
lubricant
D
50
H
47
.
Refer
to
metal
-
clad
instruction
book
GEH
-
1802
for
instructions
on
inserting
the
break
-
er
into
the metal
-
clad
unit
.
7
.
DO
NOT
WORK
ON
EITHER THE
BREAKER
DESCRIPTION
OF
OPERATION
The
Magne
-
blast
B
reaker
has
two
principal
com
-
ponents
;
the
breaker
element
and
the
operating
mechanism
:
The
breaker
element
is
three
similar
pole
units
,
each
of
which
includes
the
current
carrying
parts
,
main
and
arcing
contacts
,
interrupter
,
and
an
enclosing
barrier
system
that
provides
insulation
between
poles
,
or
phases
and
to
ground
.
The
pri
-
mary
connections
to
the
associated
metal
-
clad
switchgear
are
made
through
the
ball
contacts
at
the
top
of
the
breaker
bushings
.
The
operating
mechanism
type
ML
-
13
is
of
the
stored
energy
type
designed
to
give
high
speed
closing
and
opening
.
The
mechanism
will
operate
on
a
-
c
or
d
-
c
voltage
as
indicated
on
the
breaker
nameplate
.
Closing
and
opening
operations
are
controlled
either
electrically
from
the metal
-
clad
unit
and
remote
location
,
or
mechanically
by
the
manual
close
and
trip
levers
on
the
breaker
.
All
secondary
connections
from
the
breaker
to
the
metal
clad
unit
are
made
through
the
coupler
(
1
)
Fig
.
2
.
A
spring
release
interlock
,
Fig
3
,
is
provided
to
discharge
both
the
closing
and
opening
springs
when
the
breaker
is
withdrawn
from
or
inserted
into
the
Metal
Clad
unit
.
4
Courtesy of NationalSwitchgear.com