GE AM-13.8-500-5A User manual

GEI
-
88764
A
INSTRUCTIONS
SUPERSEDES
GEI
-
88764
AND
RENEWAL
PARTS
AM
-
13.8
-
500
-
5
A
AM
-
13.8
-
500
-
5
AB
AM
-
13.8
-
500
-
5
C
AM
-
13.8
-
500
-
5
CB
AM
-
13.8
-
500
-
5
H
AM
-
13.8
-
500
-
5
HB
<
CONTENTS
1
Introduction
Receiving
,
Handling
2
and
Storage
2
Installation
Description
of
4
Operation
7
Adjustments
12
General Maintenance
Renewal
Parts
30
SWITCHGEAR
DEPARTMENT
GENERAL
m
VM
'
j
ELECTRIC
PHILADELPHIA
,
P A
.
Courtesy of NationalSwitchgear.com

;
r
Courtesy of NationalSwitchgear.com

GEI
-
88764
MAGNE
-
BLAST
CIRCUIT
BREAKER
AM
-
13
•
8
-
500
-
5
(
A
)
A
Letter
Designation
A
,
B
,
C
,
and
H
,
used
immediately
following
the model
number
indicates
basic
design
features
.
INTRODUCTION
The
magne
-
blast
circuit breaker
is the
removable
interrupting
element
for
use
in
vertical
-
lift
metal
-
clad
switchgear
,
to
provide
reliable
control
and
protection
of
power
systems
.
Among
the
many
advantages
of
metal
-
clad
switchgear
are
added
protection
to
equipment
and
personnel
,
compactness
,
simplified
installation
and
reduced
maintenance
.
In
keep
-
ing
with
these
features
the
magne
-
blast breakers
are
designed
for
in
-
terchangeability
and
maneuverability
,
together
with
reliability
and
low
maintenance
requirements
.
The
magne
-
blast circuit
breaker
operates
on
the
principle
that
an arc
can
be
interrupted
in
air
by
sufficiently
elongating
and
cooling
it
.
This
is
accomplished
by
means
of
a
strong
magnetic
field
that
lengthens
the
arc
and
forces
it
into
intimate
contact
with
cool
dielectric
ma
-
terial
.
A
sturdy
,
reliable
operating
mechanism
assures
low
maintenance
and
long
life
.
0
magne
-
blast
breaker
Is
available
In
a
number of
current
Refer
to
the
breaker
nameplate
for
the
complete
rating
mation
of
any
particular
breaker
,
imposed
on
the
breaker
must not
exceed
its
rating
,
nor
should
it be
called
upon
to
operate
at
voltages
or
currents
greater
than
those
given
on
the
nameplate
.
Since
this book is
written
to
cover
several
ratings
of
breakers
that
are
of the
same
general
design
,
all
instructions
will
be
of
a
general
character
and
all
illustrations
will
be
typical
,
unless
otherwise
specified
.
infor
-
The
short
circuit conditions
to
be
PROPER
INSTALLATION
AND
MAINTENANCE
ARE
NECESSARY
TO
INSURE
CONTINUED
SATISFACTORY
OPERATION
OF
THE BREAKER
.
The
following
instructions
will
provide
complete
Information
for
placing
magne
-
blast breakers
in
ser
-
vice
and
for
maintaining
satisfactory operation
.
These
instructions
do
not
purport
to
cover
all
details
or
variations
in
equipment
nor
to
provide
for
every
possible
contingency
to
be
met
in
connection
with
installation
,
operation
or
maintenance
.
Should
further
information
be
desired
or
should
particular problems
arise
which
are
not
covered
sufficiently
for
the
purchasers
purposes
,
the
matter
should
be
referred
to
the
General
Electric
Company
.
1
Courtesy of NationalSwitchgear.com

GEI
-
88
?
64
RECEIVING
,
HANDLING
,
AND
STORAGE
Receiving
and
Handling
Each
breaker
is
carefully
inspected
and
packed
by
workmen
experienced
in
the
proper
handling
and
packing
of
electrical
equipment
.
Immediate
-
ly
upon
receipt
of
the
circuit
breaker
,
an
examination
should
be
made
for
any
damage
sustained
in
transit
.
If
injury
or
rough
handling
is
evident
,
a
damage
claim
should
be
filed
immediately
with
the
transpor
-
tation
company
and
the
nearest
General
Electric
Sales
Office
should
be
notified
.
It
is
expected
that
due
care
will
be
exercised
during
the
unpacking
and
installation
of
the
breaker
so
that
no
damage
will
occur
from
care
-
less
or
rough
handling
,
or
from
exposure
to
moisture
or
dirt
.
Loose
parts
associated
with
the
breaker
are
always
included
in
the
same
crate
.
Check
all
parts
against
the
packing
list
to
be
sure
that
no
parts
have
been
overlooked
.
Storage
It
is
recommended
that
the
breaker
be
put
into
service
immediately
in
its
permanent
location
.
If
this
is
not
possible
,
the
following
pre
-
cautions
must
be
taken
to
insure
the
proper
storage
of
the
breaker
:
1
.
The
breaker
should
be
carefully
protected against
condensation
,
pre
-
ferably
by
storing
it
in
a
warm
dry
room
,
since
water
absorption
has
an
adverse
effect
on
the
insulation
parts
.
Circuit breakers
for
out
-
door
metal
-
clad
switchgear
should
be
stored
in
the
equipment
only
when
power
is
available and
the
heaters
are
in
operation
to
prevent
condensation
.
2
.
The
breaker
should
be
stored
in
a
clean
location
,
free
from
corrosive
gases
or
fumes
;
particular
care
should
be
taken
to
protect
the
equip
-
ment
from
moisture
and
cement
dust
,
as
this
combination
has
a
very
corrosive
effect
on
many
parts
.
3
.
Machined
parts
of
the
operating
mechanism
,
etc
with
a
heavy
oil
or
grease
to
prevent
rusting
.
If
the
breaker
is
stored
for
any
length
of
time
,
it
should
be
Inspected
periodically
to
see
that
rusting
has
not
started
and
to
insure
good
mechanical
condition
.
Should
the
breaker
be
stored
under
unfavorable
atmospheric
conditions
,
steps
should
be
taken
to
dry
out
the
breaker
before
it
is
placed
in
service
.
INSTALLATION
should
be
coated
•
9
1
.
Remove
the
box
barrier
and
front
cover
and
make
a
visual
inspection
to
ascertain
that
the
breaker and
mechanism
is
in
satisfactory
con
-
dition
.
Check
all
bearing
surfaces
of
the
mechanism
for
lubrication
.
Refer
to
section
on
Lubrication
(
page
15
)
.
2
Courtesy of NationalSwitchgear.com

GEI
-
88
F
6
*
2
.
Charge
the
breaker
closing wrings
manually
using
a
5
/
8
"
ratchet
wrench
to turn
the
driving
eccentric
(
6
)
Fig
.
4
.
Turning
the
eccen
-
tric
counter
clockwise
will
advance
the
ratchet
wheel
and
compress
the
springs
.
When the
springs
have
reached
the
fully
charged
position
the
indi
-
cator
(
10
)
Fig
.
4
will
read
"
CHARGED
"
,
and
the
driving
pawl
will
he
raised
from
the
ratchet
wheel teeth
.
Additional
turning
of the
ec
-
centric
will
not
advance
the
ratchet
wheel
.
Insert
the
spring
blocking
device
(
4
)
Fig
.
4
and
manually discharge
the
springs
against
the
pins by
pushing
the
manual
release
button
(
1
)
Fig
.
4
.
The
springs
are
now
blocked
and
slow
closing
of
the
breaker
contacts
can
be
accomplished by
again
turning
the
driving
eccentric
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
se
-
curely
in
the
closed
position
,
said that
it
trips
freely
when
the
man
-
ual
trip
lever
is
operated
.
The
breaker
should
not
be
operated
electrically
until
It
has
been
operated
several
times
manually
to
insure freedom
of
action
.
At
this
time
,
also
check
the
following
adjustments
:
Refer
to
page
7
Refer
to
page
7
Refer
to
page
7
a
.
Primary
contact
wipe
b
.
Arcing
contact
wipe
e
.
Primary
contact
gap
"
DO NOT WORK ON
EITHER THE BREAKER
OR
MECHANISM
UNDESS
THE
CLOSING
SPRINGS
ARE
BLOCKED
AND
THE
OPENING
SPRINGS
HAVE
BEEN
TRIPPED
OPEN
OR
MECHANICALLY
BLOCKED
.
THIS
PRECAUTION IS
REQUIRED
TO
PREVENT
ACCIDENTAL CLOSING
OR TRIPPING
.
"
1
After the
adjustments
have
been
checked
,
the
springs
can
be
un
-
blocked
.
Rotate
the
driving
eccentric
until
the
indicator
reads
"
CHARGED
"
and
the
ratchet
wheel
no
longer
is
advanced
.
The
blocking
device
can
now
be
removed
.
3
.
Attach
test
coupler
to
circuit breaker
and
operate
electrically
several
times
.
Check
the
control
voltage
as
described
under
"
CON
-
TROL
POWER CHECK
"
.
NOTE
:
If
the
breaker
secondary
wiring
is
to
be
given
a
hi
-
potential
test
at
1500
volts
,
remove
both the
motor
leads
from
the
terminal
connection
.
Failure
to
disconnect
the
motor
from
the
circuit
may
cause
damage
to
the
winding
insulation
.
4
.
Remove
the
test
coupler
and
replace
box
barrier
.
/
W
:
3
Courtesy of NationalSwitchgear.com

GEI
-
88764
5
.
If
breaker
has
been
stored
for
a
long
period
of time
,
it is
recom
-
mended
that
the
insulation
be
checked
with
a
standard
60
cycle
high
potential
test
.
Refer
to
Insulation
Test
(
pagel
5
)
.
6
.
Lubricate
the
silver
portion
of
the
primary
disconnect
studs
by
rubbing
a
small
amount
of
contact
lubricant
D
50
H
47
to
form
a
thin
coating
on
the
ball
contact
.
7
.
Refer
to
metal
-
clad
instruction
book
GEH
-
1802
for
final
instructions
before
inserting
the
breaker
into the
metal
-
clad
unit
.
DESCRIPTION
OP
OPERATION
:
/
The
magne
-
blast
breaker
is
composed
of
two
major
parts
,
the
breaker
element
and
the
operating
mechanism
.
The
breaker
element
comprises
three
similar
pole
units
,
each
pole
unit
consisting
of
main
and
arcing
contacts
,
an
interrupter
,
and
an
enclosing
box
barrier that
segregates
the
interrupting
units
from
each
other
to
provide
Insulation
between
phases
as
well
as
from
each
phase
to
ground
.
The
primary
connections
to
the
associated
metal
-
clad
equipment
are
made
through
the
primary
disconnect
studs
.
The
ML
-
13
operating
mechanism
shown
in
Figures
1
,
2
,
and
3
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
name
plate
.
Closing
and
opening
operations
are
controlled
electrically
by
the
metal
-
clad
or
remote
relaying
,
.
.
and
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
(
l
)
Fig
.
1
.
A
positive
interlock
(
2
)
Fig
.
3
and interlock switch
(
2
)
Fig
.
1
are
provided
between
the
breaker and
metal
-
clad
unit
to
prevent
raising
or
lowering
of
the
breaker
in
the
unit while
in
a
closed
position
and
to
prevent
a
closing
operation
when
the
breaker
is
not
in
either
the
fully
raised
or
lowered
position
.
A
plunger
can
also
be
provided
to
operate
an
additional
auxiliary
switch
mounted
in
the
metal
-
clad
unit
.
The
operating
mechanism
used
on
those
breakers
designed
for
MI
-
6
metal
-
clad
equipment
differs
somewhat
from
those
designed
for
M
-
3
o
equipment
but
,
its
operation
is
principally
the
same
.
These
breakers
are
identi
-
fied
by
the
"
A
”
suffix
In
the
breaker
nomenclature
.
This
mechanism
is
controlled
by
a
relay
in
the
metal
-
clad
unit
to
make
it
computable
with
solenoid
operated
breakers
.
Two
seven
point
ter
-
minal
secondary
couplers
also
replace
the
one
sixteen
terminal
coupler
.
The
positive
interlock
between the
breaker
and
metal
-
clad
unit
is
re
-
placed
with
a
trip
interlock
that
trips
the
mechanism
before
raising
or
lowering
of
the
breaker
can
be
accomplished
.
A
fork
-
type
lever
can
be
furnished
to
operate
an
auxiliary
switch
mounted
in
the
metal
-
clad
mit
.
Motor
circuit
fuses
are
mounted
on
the
breaker
for
protection
.
4
Courtesy of NationalSwitchgear.com

GEI
-
88764
When
the
breaker
is
interchangeable
with
MS
-
13
solenoid
operated
breakers
in
M
-
36
metal
-
clad
units
,
motor
circuit
fuses
are
mounted
on
the
breaker
for
protection
.
These
breakers
are
identified
by
the
"
C
"
suffix
in
the
breaker
nomenclature
.
,
Vf
•
*
Spring
Charging
The
mechanism
consists
of
a
high
speed
.
gear
motor
that
compresses
a
set
of
closing springs through
the
action
of
a
simple
eccentric
,
ratch
-
et
,
and
pawl assembly
.
The
rotary
action
of
the
motor
(
2
)
Fig
.
4
is
converted
to
a
short
straight
stroke
pumping
action
through
the
eccent
-
ric
(
6
)
and
a
lever
that
carries
a
spring
loaded
driving
pawl
(
5
)
.
The
pawl
advances
the
ratchet
wheel
(
3
)
Fig
.
3
only
a
few
degrees
each
stroke
where it is held
in
position
by
the
latching
pawls
(
l
)
,
When
the
ratchet
wheel
has
been
rotated
approximately
loG
degrees
the
clos
-
ing
springs
(
6
)
will
be
fully
compressed
.
As
the
ratchet
wheel
con
-
tinues
to
rotate
,
the
spring
load
will
shift
over
center
and
attempt
to
discharge
.
After
only
a
few
degrees
of
rotation
,
the
closing
roller
(
10
)
Fig
.
1
will
engage
the
closing
latch
(
11
)
and
the
compressed
springs
will
be held
in
repose
until
a
closing operation
is
required
.
During
the
last
few
degrees
of the
ratchet
wheel
rotation
the
motor
and
interlock
switches
(
6
)
are
released
and
the
driving
pawl
is
raised
from
the
ratchet
wheel
surface
.
This
allows
the
motor
and
driving
mechanism
to
coast
to
a
natural
stop
expending
all
residual
energy
.
During
the
time
the
springs
are
being compressed
a
relay
(
6
)
Fig
.
6
locks
the
closing
power
circuits
open
and
the
relay
will
remain
ener
-
gized
until the
springs
are
fully
charged
and
the
control
contacts
are
re
-
set
.
The
closing
springs
may
be
charged manually
if
control
voltage
is
lost
.
A
5
/
8
”
ratchet
wrench
can
be used
to
rotate
the
eccentric
in
a
counter
clockwise
direction
until the
indicator
reads
“
CHARGED
"
and
the
driving
pawl
no
longer
engages
the
ratchet
wheel
.
The
use
of the
ratchet
wrench
provides
for
maximum
safety
in
the
event
that control
power
is
suddenly
In
this
event
,
the
motor
drive
will
take
over
restored
without
warning
again
and
continues
to
charge
the
springs
.
Closing
Operation
Closing
the
breaker
is
accomplished
by
energizing
the
closing
solenoid
or
by
manually pressing
the
close
button
.
In
either
case
,
the
closing
latch
is
removed from
the
spring
blocking
location
allowing
the
springs
to
discharge
.
The
energy
of the
springs
is
applied
to
the
rotation
of
a cam
(
16
)
Fig
.
5
that closes
the
breaker
through
a
simple
linkage
that
remains
trip
free
at
all
times
.
A
monitoring
switch
(
11
)
Fig
.
6
on
the
closing
latch
will
start
the
spring charging
motor
after
it
is
fully
reset
.
Ui
:
•
5
Courtesy of NationalSwitchgear.com

GEI
-
88764
Opening Operation
An
electrical
opening
operation
is
initiated
by
energizing
the
trip
coil
.
This
is
accomplished
either
by
actuating
the
opening
control
switch
on
the
metal
-
clad
unit
or
by
a
combination
of
relays
and
current
devices
used
to
detect
a
fault
on
the
load
side
of the
breaker
,
energizing
the
trip
coil
,
the
trip
plunger
rotates
the
trip
latch
(
7
)
,
Pig
*
5
>
causing
the
operating
mechanism
linkage
to
collapse
.
The
energy
stored
in
the
opening
springs
is thus
released
,
opening
the
breaker
.
During
this
operation
*
the
trip
coil circuit
is
deenergized
,
and
upon
completion
of
the
opening
operation
,
the
operating
mechanism
is returned
to
its
normal
position
,
ready
for
closing
.
As
the
breaker
opens
,
the
main
contacts
part
first
,
shunting
the
cur
-
rent
through
the
arcing
contacts
.
An
arc
forms
as
the
arcing
contacts
part
.
See
Fig
.
7
*
As
the
movable
arcing
contact
(
7
)
is
withdrawn
through
the
probes
in
the
arc
runner
,
the
upper
end
of
the
arc
is
trans
-
ferred
to
the
upper
arc
runner
(
4
)
.
To
assist
the
interruption
at
this
point
,
a
stream
of
air
is
emitted
from
the booster
tube
(
25
)
and forces
the
arc
onto
the lower
arc
runner
(
8
)
.
Establishment
of
the
arc
on
the
runners
automatically
inserts the blowout
coils
into
the
circuit
,
intro
-
ducing
a
magnetic
field
between the
pole
pieces
which
tends
to
draw
the
arc
away
from the
arcing
contacts
.
The
interrupter
contains
three
up
-
per
blowout
coils
and
three
lower
blowout
coils
each
Individually
con
-
nected
in
series
with
its
respective
section
of
arc
runner
.
As
the
arc
is
forced
outward
along
the
diverging
arc
runners
,
the
magnetic
field
is
progressively
increased
with
the
addition
of
each coil
in
the
cir
-
cuit
.
By
;
v
'
At
the
same
time
,
the
arc
is
being
forced
into
the
arc
chute
(
3
)
which
is
composed
of
a
series of
gradually interleaving insulating
fins
.
These
fins
,
which
project
alternately
from
the
two
opposite
inner
sur
-
faces
of
the
chute
,
elongate
the
are
into
a
gradually
deepening
serpen
-
tine
path
,
so
that
the
electrical
resistance
in
the
path
of
the
arc
is
rapidly
increased and
the
heat
from
the
arc
is
absorbed
.
The
increased
resistance
reduces
both
the
magnitude
and
the
phase
angle
of the
current
,
and
at
an
early
current
-
zero
the
arc
path
Is
so
long
and
the
gases
pro
-
duced
by
the
arc
so
cooled
that
the
arc
cannot
reestablish
itself
and
,
interruption
occurs
.
Manual
tripping
follows
the
same
procedure
except
that
instead
of
ener
-
gizing
the
trip
circuit
,
the
manual
trip
(
11
)
Fig
.
2
is
used
.
Trip
Free
Operation
If
the
trip
coil
circuit
is
energized
while
the
breaker
is
closing
,
the
trip
pi
roller
re
-
open
.
springs
will
re
-
charge
as
in
a
normal
closing operation
.
er
will
force
the
trip
latch
(
8
)
Fig
.
5
away
from
the
trip
causing
the
mechanism
linkage
to
collapse
and
the
breaker
to
The
closing
cam
(
l
6
)
will
complete
its
closing
stroke
and
the
(
§
?
try
aL
:
'
6
Courtesy of NationalSwitchgear.com

GEI
-
88764
ADJUSTMENTS
All
adjustments
should
he
checked
during
periodic
inspections
and
when
-
ever
it
becomes
necessary
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
.
First
,
however
,
remove
the
breaker
from
the
metal
-
clad
unit
and
remove
the
box
barriers
and
front
cover
.
"
DO
NOT
WORK
ON
EITHER
THE
BREAKER
OR
MECHANISM
UNLESS
THE
CLOSING
SPRINGS
ARE
BLOCKED
AND
THE
OPENING SPRINGS
HAVE
BEEN
TRIPPED
OPEN
OR
MECHANICALLY
BLOCKED
.
THIS
MEASURE IS
REQUIRED
TO
PREVENT
ACCIDENTAL
CLOSING
OR
TRIPPING
.
”
Primary
Contact
Wipe
When
the
breaker
is
closed
,
as
shown
in
Fig
.
8
,
the
stationary
primary
contacts
(
l
)
should
rise
5
/
l
6
”
-
f
0
—
l
/
l
6
”
.
Before
cheeking
this
dimen
-
sion
be
sure
the
mechanism
is
re
-
set
so
that
the
prop
pin
(
13
)
Fig
.
5
is
resting
on
the
prop
.
To
obtain
the
proper
contact
adjustment
,
open
the
breaker
and
,
referring
to
Fig
.
9
,
loosen
the
check
nut
(
4
)
and
turn
the
adjusting
nut
(
3
)
.
Screwing
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
)
and
the
buffer
block
should
be
l
/
l
6
"
or
greater
(
as
shown
in
Fig
.
8
)
breaker
is
fully
closed
.
Arcing
Contact
Wipe
Refer
to
Fig
.
8
.
Close
the
breaker
until the
arcing
contacts
just
touch
.
This
can
be
determined
with
the
use
of
a
circuit
continuity
tester
such
as a
light
indicator
or
bell
set
.
In
this
position
,
the
gap
between
the
stationary
primary
contacts
(
l
)
and
the
movable
primary
contact
(
2
)
should be
5
/
l
6
"
or
greater
.
This
setting
has
been
made
in
the
factory
and
no
adjustment
is
provided
.
A
wipe
of
less
than
5
/
16
”
is
usually
an
indication
that
the
arcing
contacts
need
to
be
replaced
.
When
making
this
check
,
also
see
that
the
movable
'
arcing
contact
(
5
)
passes
between the
probes
on
the
upper
arc
runner
without
touching
.
Primary
Contact
.
Gap
when
the
Refer
to
Fig
.
9
-
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
(
3
)
and
the
movable
primary
contact
(
6
)
should
be
5
-
1
/
4
”
+
5
/
16
"
—
1
/
8
”
.
To
change
this
gap
,
loosen
the
check
nut
(
17
)
,
Fig
.
5
and
turn
the
adjusting
nut
(
18
)
on
stud
(
19
)
decrease
the
primary
contact
gap
.
Tighten
the
check
nut
and
re
-
measure
the
contact
gap
(
close
and
trip
the
breaker
before
checking
the
mea
-
surement
)
.
.
Screwing
the
adjusting
nut
down
will
*
7
Courtesy of NationalSwitchgear.com

GEI
-
88764
Trip
Latch
Wipe
Refer
to
Pig
.
5
.
The
wipe
of the
trip
latch
(
8
)
on
the
trip
roller
(
9
)
should he
from
3
/
18
”
to
1
/
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
,
in
-
spection
is
usually
all
that
is
required
.
If
this
setting
is
not
cor
-
rect
,
look for
insufficient travel
of
the
trip
shaft
(
7
)
.
WHEN
WORKING
ON
THE
MECHANISM
IN
THE
CLOSED POSITION
,
KEEP
FINGERS
CLEAR
OF
THE
LINKAGE
,
AS
ACCIDENTAL
TRIPPING
CAN CAUSE SEVERE
INJURY
.
Trip
Latch Clearance
Refer
to
Fig
.
5
.
With
the
breaker
in
the
tripped
position
and
the
closing springs
charged
,
check
the
clearance
between
the
trip
latch
(
8
)
and
the
trip
roller
(
9
)
.
It
should
measure
1
/
32
”
to
l
/
l
6
"
.
Prop
Clearance
Refer
to
Fig
.
5
*
With
the
breaker
closed
as
far
as
possible
,
that
is
,
with
the
springs
blocked
and
the
cam
(
l
6
)
rotated
so
that
the
prop
pin
(
13
)
is
at
its
maximum
height
over
the
prop
(
14
)
,
the
clearance
between
the
prop
and
prop
pin
should be
l
/
l
6
”
to
5
/
32
”
.
No
adjustment
is
pro
-
vided
and
a
visual
inspection
is
usually
all
that
is
required
.
Release
Latch
Wipe
Refer
to
Fig
.
6
.
The
wipe
between
the
release
latch
(
3
)
and
roller
(
2
)
should
be
3
/
l
6
"
to
1
/
4
”
.
If
re
-
setting
is
required
,
loosen
,
set
,
and
re
-
tighten
adjustment
nut
and
screw
(
4
)
.
Release
Latch
Monitoring
Switch
The
release
latch
must
be
fully
re
-
set
and
the
monitoring
switch
opera
-
ted before
the
motor
will
start
.
The
switch
should
be
wiped
by
the
striker
so
that
the
clearance
between the striker
and
switch
mounting
bracket
(
2
G
)
Fig
.
6
is
1
/
32
”
or
less
.
To
obtain
this
adjustment
bend
the
switch
striker
.
Be
sure
the
latch
is
fully
re
-
set
before
making
any
adjustments
.
Motor
and
Relay
Switches
fl
)
Fig
.
6
until
has traveled
the
maximum
amount
(
about
180
de
-
and
rotate
switch
and
support
(
15
)
is
With the
closing
springs
blocked
rotate
the
switch
cam
the
switch
striker
(
8
)
grees
rotation
of
cam
)
.
(
14
)
(
8
)
Loosen
mounting
bolt
support
(
15
)
until the
gap
between the
striker
1
/
32
”
or
less
.
'
T
-
i
-
8
Courtesy of NationalSwitchgear.com

GEI
-
88764
Interlock Switch
Wipe
Refer
to
Pig
.
10
.
Rotate
the
interlock
shaft
(
l
)
manually
clockwise
to
release
the
interlock switch
arm
(
2
)
.
The
point
at
which
the
con
-
tacts
make
can
be
determined
with
a
circuit
continuity
tester
such
as
a
light
indicator
or
bell
set
.
To
obtain
adjustment
on
the
interlock
switch
(
3
)
,
bend
the
interlock
switch
arm
(
2
)
of
1
/
32
"
clearance
to
the
switch
mounting plate
(
4
)
.
Auxiliary
Switch
The
auxiliary
switch
(
9
)
»
Pig
.
11
is
mounted
on
the
left
side
of the
operating
mechanism
.
The
shaft
of the
position
indicator
(
8
)
operates
the
auxiliary
switch
shaft
which
opens
and
closes
the
"
a
"
and
"
b
"
con
-
tacts
.
The
"
a
"
contacts
are
open
when
the
breaker
is
open
and
the
"
bM
contacts
are
open
when the
breaker
is
closed
.
The
"
a
"
contacts
should
close
when the
breaker
primary
contact
gap
is
a
minimum
of
1
"
.
The
"
b
"
contacts
need
only
to
be
checked
to
see
that
they
are
open
when the
breaker
is
closed
.
No
adjustment
is
provided
and
a
visual
inspection
is
usually
all
that
is
required
.
Driving
Pawl
Adjustment
The
driving
pawl
(
5
)
Pig
.
4
must
advance
the
ratchet
wheel
(
3
)
Pig
.
3
sufficiently
on
each
stroke
to
allow
the
latching
pawls
(
l
)
to
fall
into
the
ratchet
teeth
.
This
should be
checked
with
the
maximum
clos
-
ing
spring
load
against
the
driving
members
.
With the
mechanism
un
-
blocked
,
hand
charge
the
closing
springs
with the
manual
charging
wrench
until
they
are
slightly
more
than half
charged
.
Slowly
rotate
the
charging
wrench
until the
driving
pawl
(
5
)
Pig
.
4
has
traveled
through
Its
return
stroke
and
check
the
maximum
clearance
between
the
pawl
and
the
ratchet
tooth
.
Rotate
the
charging
wrench
until the
driv
-
ing
pawl
has
advanced
the
ratchet
tooth
to
its
maximum
travel
.
Now
check
the
clearance
between
the
ratchet
tooth
and
the
latching
pawl
(
l
)
Pig
.
3
.
The
clearance
should
be
approximately
equal
for
both
the
driving
and
latching
pawls
and
not
less
than
.
015
"
in
either
case
.
If
adjustment
is
required
for
either
pawl
the
springs
must
first
be
fully
charged
and
blocked
.
Loosen
seven
motor
support
bolts
(
1
)
Pig
.
15
and
move
entire
motor
assembly
to
the
rear
if
the
clearance
is
un
-
der
the
minimum
at
the
latching
pawls
,
and
to
the
front
if
the
clear
-
ance
is
under
the
minimum
at
the
driving
pawl
.
Move
the
motor
assembly
approximately
twice
the
dimensional
increase
required
at
the
pawl
.
Be
certain
the
motor
assembly
Is
moved
straight
forward
or
rearward and
tighten
the
one
bolt
on
the
right
side
of
the
mounting
frame
first
to
assure
proper
alignment
.
After
tightening
the
remaining
bolts
the
springs
should
be
released
and
the
clearance
again
checked
as
described
above
.
until
there
is
a
maximum
V
-
V
.
'
9
Courtesy of NationalSwitchgear.com

GEI
-
88764
AUXILIARY
DEVICES
Latch
Checking
Switch
Refer
to
Fig
.
12
.
Rotate
the
trip
latch
(
4
)
clockwise
(
looking
at
the
left side
of the
mechanism
)
by
pressing
the
manual
trip
lever
to
open
the
latch
checking
switch
operating
arm
(
3
)
.
Allow the
trip
latch
to
reset
slowly
and
determine
the
point
at
which
the
contacts
make
by
using
a
circuit
continuity
tester
,
such
as
a
light
indicator
or
bell
set
.
The
contacts
of the
latch
checking
switch
should
Just
make
when the
gap
between the
trip
latch
(
4
)
and
the
stop
pin
(
5
)
located
on
the
crank
(
7
)
is
l
/
l
6
"
.
There
should
be
a
minimum
of
1
/
64
”
between the
operating
arm
(
3
)
Pig
-
12
and
the
switch
support
(
l
)
.
To
obtain ad
-
justment
of
the
latch
checking
switch
(
2
)
bend the
latch
checking
switch
operating
arm
(
3
)
.
Plunger
Interlock
Refer
to
Fig
.
13
.
With the
breaker
in
the
open
position
,
the
vertical
distance
"
A
"
from the
top
of the
interlock
bolt
(
l
)
to
the bottom
of
the
elevating
bar
(
3
)
should
be
10
-
7
/
32
”
plus
or
minus
l
/
l
6
"
.
To
change
this
adjustment
,
add
or remove
washers
(
2
)
.
Auxiliary
Switch
Linkage
(
Furnished
Special
'
on
'
Breakers
With
"
A
”
Suffix
)
Refer
to
Fig
.
14
.
With the
breaker
in
the
open
position
,
the
distance
from
the
centerline
of
the
front
bushing
(
1
)
to
the
center
of
the
switch
operating
pin
(
2
)
should
be
12
|
r
”
as
shown
.
To
change
this
set
-
ting
,
loosen
the
locking
bolts
(
6
)
,
remove
the
pin
(
4
)
and
turn
the
clevis
(
5
)
.
Reassemble
and check
adjustment
.
Auxiliary
Fuses
Refer
to
Fig
.
15
-
On
breakers
with
"
A
”
and
"
C
"
suffixes
,
a
set
of
pro
-
tecting
fuses
(
4
)
are
mounted
on
the front of the
breaker
.
These
fuses
will
be
the
primary
protection
devices
for
the
closing
control
circuits
on
those
breakers that
are
used
in
metal
-
clad
units
designed
for sole
-
noid
operated
breakers
.
Inspection
and
Test
“
C
•
•
V
*
;
-
1
.
For
ease
in
reviewing
the
adjustments
,
the
following
are
recapitulated
:
a
.
Primary
contact
wipe
:
5
/
l
6
n
-
f
0
—
l
/
l
6
”
.
b
.
Arcing
contact
wipe
:
5
/
16
"
or
greater
(
gap
at
primary
contacts
)
.
c
.
Primary
contact
gap
:
5
-
1
/
4
"
+
5
/
l
6
"
-
1
/
8
"
.
d
.
Trip
latch
wipe
:
3
/
16
"
to
1
/
4
"
~
1
stop
pin
.
e
.
Trip
latch
clearance
:
1
/
32
"
to
l
/
l
6
"
.
f
.
Prop
clearance
:
l
/
l
6
"
to
5
/
32
"
.
10
Courtesy of NationalSwitchgear.com

GEI
-
88764
3
/
16
"
to
1
/
4
"
.
Release
latch
wipe
:
Release
latch
monitoring
switch
:
Motor
and
relay
switch
:
Interlock
switch
:
g
.
maximum
clearance
1
/
32
”
.
maximum clearance
1
/
32
"
.
maximum clearance
l
/
32
"
.
Auxiliary
switch
"
a
"
contacts
close
when
breaker
primary
contact
gap
is
1
"
or
greater
.
Driving
and
Latching
Pawl
:
minimum
clearance
to
ratchet
teeth
.
013
"
.
Latch
checking
switch
contacts
make
when
the
gap
between
the
trip
latch and
the
stop
pin
is
l
/
l
6
"
.
Plunger
interlock
:
10
-
7
/
32
"
plus
or
minus
l
/
l
6
"
.
Auxiliary
switch
linkage
:
12
-
1
/
4
"
(
"
A
"
breakers
only
)
.
h
.
i
.
j
.
k
.
1
.
m
.
n
.
o
.
2
.
Check
all
nuts
,
washers
,
bolts
,
cotter
pins
,
and
terminal
connec
-
tions
for
tightness
.
3
.
Inspect
all
wiring
to
make
sure
that
no
damage
has
resulted
during
installation
,
and
test
for
possible
grounds
or
short
circuits
.
4
.
See
that
all
bearing
surfaces
of the
mechanism
have
been
lubricated
.
Refer
to
the
section
on
LUBRICATION
.
5
.
Operate
the
breaker
slowly
with
the
manual
charging
wrench
and
note
that
there
is
no
excessive
binding
or
friction and
that
the
breaker
can
be
moved
to
the
fully
opened
and
fully
closed
positions
.
6
.
See
that
any
place
where
the
surface
of the
paint
has
been
damaged
is
repainted
immediately
.
7
.
Check
the
trip
coil
plunger
and
the
release
coil
plunger
to
see
that
they
move
freely
.
Opening
and
Closing
Speeds
The
closing
speed
of
the
arcing
contact
of
the
breaker
should be
a
minimum
of
11
feet
per
second
.
This
represents
the
average
speed
of
the
movable
arcing
contact
from
a
point
1
"
before
the
tip
is
tangent
to
the
lower
surface
of
the
upper
arc
runner
to
the
tangent
position
.
The
opening speed
of
the
arcing
contact
should be
a
minimum
of
15
feet
per
second
.
This
represents
the
average
speed
over
3
"
from
the
point
when the
tip
on
the
movable
contact
Is
tangent
to
the
lower
surface
of
the
upper
runner
.
Control
Power
Check
After
the
mechanism
has
been
closed
and
opened slowly
several
times
with
the
maintenance
closing
wrench and
the
mechanism
adjustments
are
checked
as
described
,
the
operating
voltages
should
be
checked
at
the
release
coil
,
trip
coil
,
and
motor
terminals
.
For
electrical
operation
of the
mechanism
,
the
control
power may
be
either
an
alternating
or
direct
cur
-
rent
source
.
The
operating
ranges
for the
closing
and
tripping
voltages
are
given
on
the
breaker
nameplate
.
The
following
ranges
are
standard
:
11
Courtesy of NationalSwitchgear.com

GEI
-
88764
Closing
Range
Tripping
Range
Nominal
Voltage
•
*
.
>
Min
Min
.
Max
.
Max
.
60
v
d
-
c
125
v
d
-
c
l
40
v
d
-
c
250
v
d
-
c
280
V
d
-
c
125
v
a
-
e
250
v
a
-
c
28
34
48
v
d
-
c
llOv
d
-
e
125
v
d
-
c
220
v
d
-
c
25
Ov
d
-
e
115
v
a
-
c
230
v
a
-
c
50
v
d
-
c
115
v
d
-
c
130
v
d
-
c
230
v
d
-
c
260
v
d
-
c
125
v
a
-
c
250
v
a
-
c
60
80
90
70
160
120
180
140
95
95
190
190
If
the
closed circuit
voltage
at
the
terminals
of the
coil
or
motor
does
not
fall
in
the
specified
range
,
cheek
the
voltage
at
the
source
of
pow
-
er
and
line
drop
between
the
power
source
and breaker
.
When
two
or more
breakers
operating
from the
same
control
power
source
are
required
to
close
simultaneously
,
the
closed circuit
voltage
at
the
closing
coil
or
motor
of
each
breaker
must
fall
within
the
specified
limits
.
Electrical
closing
or
opening
is
accomplished
by
merely energizing
the
closing
or
trip
coil circuit
.
Control
switches
are
provided
for
this
purpose
on
the
metal
-
clad
unit
.
It
is
also
possible
to
trip
or
close
the
breaker
manually
by
pressing
the
manual
trip
lever
(
11
)
Fig
.
2
or
the
manual
close
button
(
7
)
.
Before
the
breaker
is
finally
raised
into
position
in
the
metal
-
clad
unit
,
rub
a
small
amount
of
G
-
E
contact
lubricant
D
50
H
47
on
the
silver
-
ed
portion
of
the
breaker
studs
to
form
a
thin
coating
for
contacting
purposes
.
GENERAL
MAINTENANCE
Dependable
service and safer
power
equipment
are
contingent
upon
the
unfailing performance
of the
power
circuit breaker
.
To
maintain such
service
,
it
is
recommended
that
a
definite
inspection
and maintenance
schedule
be
set
up
and
followed
,
as
serious
shutdowns
can
often be
avoided
by locating potential
sources
of trouble
in
an
early
stage
.
A
periodic
lubrication
of
parts
subject
to
wear
is
also
vitally
im
-
portant
for
the
successful
operation
of
the
breaker
.
12
Courtesy of NationalSwitchgear.com

GEI
-
8876
*
BEFORE
ANY
MAINTENANCE
WORK
IS
PERFORMED
,
MAKE
CERTAIN
THAT
ALL
CON
-
TROL
CIRCUITS
ARE
OPENED
AND
THAT
THE BREAKER
IS
REMOVED
FROM
THE
METAL
-
CLAD
UNIT
.
DO NOT
WORK
ON
THE
BREAKER
OR MECHANISM
WHILE
IN
THE
CLOSED
POSITION
UNLESS
THE
PROP
AND
TRIP
LATCH
HAVE
BEEN
SECURELY
WIRED
OR
BLOCKED
TO
PREVENT
ACCIDENTAL
TRIPPING
.
DO
NOT
WORK
ON
THE
BREAKER
OR
MECHANISM
WHILE
THE
SPRINGS
ARE
CHARGED
UNLESS
THEY
ARE
SECURED
IN
THAT
POSITION
BY
THE
MAINTENANCE
SPRING
BLOCKING
DEVICE
.
Periodic
Inspection
Tie
frequency
of
periodic
inspection
should
he
determined
by
each
operating
company
on
the
basis
of
the
number of
operations
(
including
switching
)
,
the
magnitude
of
currents
interrupted
,
and
any
unusual
operations
which
occur
from
time
to
time
.
Operating experience
will
soon
establish
a
maintenance
schedule which
will
give
assurance
of
proper
breaker
condition
.
On
installations
where
a
combination
of
fault
duty
and
repetitive operation
is
encountered
,
an
inspection
is
recommended
after
any
severe
fault
operation
.
The
following
instruc
-
tions list
the
main
points
to
be
included
in
an
inspection
and
,
a
num
-
ber of
general
recommendations
.
Arc
Chutes
It
Is
not
necessary
to
inspect
the
arc
chutes
unless there
Is
evidence
of
damage
or
if
the
arc
chutes
are
removed for
any
reason
.
When
in
-
specting
an
arc
chute
,
it should be
disassembled
and
the
following
points
noted
:
1
.
Scale
formed
over
the
surface
of
the
arc
chute
must
not
be
removed
,
but
loose
particles
collected
in
the
chute
should be blown
out
.
2
.
Cracks which
have
formed
in
the
fins of the
arc
chute
are
to
be
ex
-
pected
In
ceramic
materials
of
this
type
when
subjected
to
the
severe
heat
of
an arc
.
These
cracks
do
not
interfere
with the
operation
of
the
device
in
any way
and
should
be
disregarded
.
3
.
If
the
arc
chute has
suffered
any
mechanical
injury
due
to
dropping
or
accidental
striking
,
resulting
in
the
actual
breaking
off
of
fins
,
replacement
of
the
chute
will
be
necessary
.
Small
broken
corners
on
the
exhaust
end of the
chute
will
not
Interfere
with
its
performance
and
can
also
be
disregarded
.
4
.
The
plastisol
flexible
covering
for the
pole
pieces
(
3
&
4
)
Fig
.
16
and
the
upper
mounting
support
(
13
)
Pig
.
16
should
be
Inspected
for
breaks
in
the
insulation
.
If
there
are
holes
or
breaks
in
the
in
-
sulation
they
should
be
repaired
or
the
part
replaced
.
Arc
Chute
Removal
The
arc
chutes
of
the
13.8
KV
breakers
require
a
mechanical aid
to
re
-
move
and
replace
them
at
general
maintenance
periods
.
This
can
be
accomplished
by
an
overhead
crane
,
a
portable
hoist
,
or
by
an
are
chute
lifter
especially designed
for this
purpose
.
V
'
13
Courtesy of NationalSwitchgear.com

GEI
-
88764
The
Arc
Chute
Lifter
(
l
6
)
Fig
.
19
bolts
on
the
top
plate
of
the
breaker
,
in
line
with
the
chute
to
be
removed
,
and
will
lift
,
transport
,
and
re
-
lease
the
chute
as
necessary
.
To
use
the
Arc
Chute
Lifter
proceed
as
follows
:
1
.
Remove
box
barrier
(
2
)
2
.
Remove
one
bolt
(
13
)
Fig
.
19
from the
top
plate
of
the
breaker
on
the
pole
that
the
arc
chute
is
to
be
removed
.
3
.
Place
the
arc
chute
lifter
over
the
rear
bushing
and
replace
bolt
.
4
.
Lower
grappling
hooks
(
17
)
by
turning
handle
(
l
4
)
clockwise
until
hooks
can
be
placed
over
lifting
bolts
(
18
)
in
arc
chute
.
5
.
Turn
handle
counter
clockwise
until hooks
begin
to
lift
arc
chute
.
6
.
Loosen
the
two
upper
supporting
bolts
(
2
)
Fig
.
19
and
the
one
lower
supporting
bolt
(
9
)
Fig
.
19
using
a
3
/
4
"
wrench
.
7
.
Turn
handle
of
arc
chute
lifter
counter
clockwise
and
move
chute
gently
from
side
to
side until
both
upper
and
lower
supports
are
clear
.
8
.
Move
trolly
(
15
)
Fig
.
19
of
the
arc
chute
lifter
to
the
rear
.
9
.
Turn
handle
of
arc
chute
lifter
clockwise
until
arc
chute
is
rest
-
ing
on
the
floor
and
hooks
can
be
removed
.
Fig
.
7
.
Breaker
Contacts
By
removing
the box
barrier
the
movable
and
stationary
primary
contacts
and
the
movable
arcing
contacts
can
be
inspected
.
The
stationary
arc
-
ing
contacts
can
be
inspected
only
after
removing
the
arc
chute
assem
-
bly
,
as
explained
under
REPAIR
AND
REPLACEMENT
.
If
the
contacts
are
burned
or
pitted
,
they
should
be
made
smooth
with
a
fine file
.
After
completing
inspection
of the
contacts
,
check
the
contact
adjust
-
ments
as
specified
under
ADJUSTMENTS
.
Mechanism
A
careful
inspection
should
be
made
to
check
for
loose
nuts
or
bolts
and
broken
retaining
rings
.
All
cam
,
roller
,
and latch
surfaces
should
be
inspected
for
any
evidence
of
damage
or
excessive
wear
.
Lubricate
the
mechanism
as
outlined
below
,
then
,
using
the
manual
charging
wrench
,
open
and
close
the
breaker
several
times
to
make
certain
that
the
mecha
-
nism
operates
freely
throughout
its
entire stroke
.
Check
the
mechanism
adjustments
as
specified
under
ADJUSTMENTS
.
Check
all
terminal
connec
-
tions
.
Bushings
and
Insulation
The
surface
of the
bushings
should be
kept
clean
and
unmarred
to
pre
-
vent
moisture
absorption
.
If
the
insulation
surface
should
become
damaged
,
it should be
sanded
and cleaned
,
and
should be refinished
with
either
clear
varnish
or
clear
resin
.
Allow
to
dry
smooth
and hard
.
14
Courtesy of NationalSwitchgear.com

GEl
-
88764
All
other
Insulation
parts
on
the
breaker
should
be
kept
clean
and
dry
.
Smoke
or
dust
collected
between
inspection periods
should be
wiped
off
,
and
if
dampness
is
apparent
,
heaters
should
be
installed
to
insure
dry
-
ness
.
Insulation
Test
When
insulation
has
been
repaired
or
replaced
,
or
when
breaker
has
been
stored
under
adverse
conditions
,
it is
recommended that
the
insulation
be
checked
before
the
breaker
is
placed
in
service
.
A
standard
60
cycle
high potential
test
at
27
*
000
volts
RMS
will
normally
indicate
whether
the
breaker
is
satisfactory
for
service
.
With
the
breaker
contacts
in
the
fully
open
position
,
apply
the
high
potential
to
each terminal
of
the
breaker
individually
for
one
minute
with
all
other
terminals
and
the
breaker
frame
grounded
.
After
high
potential
tests
are
made
on
organic
insulating
materials
,
these
materials
should be
inspected
for
visible
leakage
current
paths
,
and
necessary
action
must
be
taken
to
replace
insulation
that
may
have
been
affected
by
moisture
absorption
.
If
the
breaker
secondary
wiring
is
to
be
given
a
hi
-
potential
test
at
1500
volts
,
remove
both of the
motor
leads
from the
terminal boards
.
Failure
to
disconnect
the
motor
from
the
circuit
may
cause
damage
to
the
winding
insulation
.
LUBRICATION
In
order
to
maintain
reliable
operation
,
it is
important
that all cir
-
cuit breakers
be
properly
lubricated
at
all
times
.
Most
of the
bear
-
ings
and
rolling
surfaces
utilize
a
new
type
of
dry
lubrication that
will
require
no
maintenance
and
will
last
the
life
of
the
equipment
.
Only
few
bearings
and
surfaces
listed
in
the
chart
,
Fig
.
20
,
require
lubrication
.
These
have
been
properly
lubricated
,
during
assembly
at
the
factory
,
using
the finest
grades
of
lubricants
available
.
However
,
even
the finest
oils
and
greases
have
a
tendency
to
oxidize
with
age
,
as
evidenced
by
hardening
and
darkening
in
color
.
Elimination
of the
hardened lubricant
is
essential
for the
proper
operation
of
circuit
breakers
.
Also
frequent
operation
of
the
breaker
causes
the
lubricant
to
be
forced
out
from between the
bearing
surfaces
.
A
simple
lubrica
-
tion
will
often
clear
up
minor
disturbances which
might
be
mistaken
for
more
serious
trouble
.
A
definite
lubrication
schedule
should
be
set
up
taking
Into
considera
-
tion
the
frequency
of
operation
of
the
breaker
and
local
conditions
.
Until
such
a
schedule
is worked
out
,
the
breaker
should
be
lubricated
at
each
periodic
inspection
and also
whenever it is
overhauled
,
in
ac
-
cordance
with the
lubrication ehart
,
Fig
.
20
.
It
is
also
recommended
that
all
circuit breakers
be
operated
at
regular
intervals
to
insure
the
user
that
the
equipment
is
operating freely
.
r
"
X
.
15
Courtesy of NationalSwitchgear.com

GEI
-
88764
The
lubrication
chart
,
Fig
.
20
,
is
divided
into
two
methods
of lubri
-
cation
.
The
first
method
outlines
the
maintenance
lubrication
which
should be
performed
at
the
time
of
periodic
maintenance
,
and
requires
no
disassembly
.
The
second
method
outlines
a
lubrication
procedure
similar
to
that
performed
on
the
breaker
at
the
factory
,
but
should
be
used
only
in
case
of
a
general
overhaul
or
disassembly
for
other
rea
-
sons
,
or
if
the
operation
of the
breaker
becomes
slower
.
General
Electric
Lubricants
D
50
H
15
and
D
50
H
47
are
available
in
1
/
44
*
collapsible
tubes
.
It
is
so
packaged
to
insure
cleanliness
and
to
pre
-
vent
oxidation
.
•
s
Method
of
Cleaning Bearings
Whenever
cleaning
is
required
,
as
indicated
in
the
lubrication chart
,
the
following procedures
are
recommended
:
Sleeve
Bearings
V
The
sleeve
bearings
used
throughout
the
linkage
utilize
Teflon
surfaces
and
do
not
require
lubrication
.
After
a
number
of
operations
,
the
sur
-
face
will
acquire
a
thin
black
film
.
Do
not
remove
this
film
unless
there is
evidence
of
outside
contaminates
,
such
as
dry
or
hardened
grease
If
contaminants
are
present
they
should
be removed
by immersing
the
link
and
bearing
in
clean
petroleum
solvent
or
similar
cleaner
and
using
a
stiff
brush
.
Do
not
remove
the
bearings
from the
links
.
DO
NOT
USE
CAR
-
BON
TETRACHLORIDE
.
t
.
:
*
\
\
V
/
'
\
.
The
hinge
of the
primary
contact
arm
(
24
)
Fig
.
7
should be
disassembled
,
cleaned
,
and lubricated
with
G
-
E
D
50
H
47
lubricant
at
general
overhaul
periods
.
The
main
shaft
bearings
(
24
)
Fig
.
5
and
the
driving
pawl
lever
bearing
should
be
removed
,
cleaned
,
and lubricated
with
G
-
E D
50
H
15
lubricant
at
general
overhaul
periods
.
V
_
*
.
’
r
'
"
—
..
Roller
&
Needle
Bearings
The
cam
follower
bearings
(
6
)
Fig
.
5
*
latch
roller
bearing
(
9
)
,
and
cam
shaft
bearings
(
25
)
Fig
.
5
should
be first
removed
from the
mechanism
and
the inner
race
disassembled
.
They
should
then
be
placed
in
a
con
-
tainer
of
clean
petroleum
solvent
or
similar
cleaner
.
DO
NOT USE
CARBON
TETROCHLORIDE
.
If
the
grease
in
*
the
bearings
has become
badly
oxidized
,
it
may
be
necessary
to
use
alcohol
(
type
used for
thinning
shellac
)
to
remove
it
.
Ordinarily
,
by
agitating
the
bearings
in
the
cleaning
solu
-
tion
,
and
using
a
stiff
brush
to
remove
the
solid
particles
,
the
bear
-
ings
can
be
satisfactorily
cleaned
.
bare hands
as
deposits
from
the
skin
onto
the
bearings
are
inductive
to
corrosion
.
If
the
bearings
are
touched
,
the
contamination
can
be
re
-
moved
by washing
in
alcohol
.
After
the
bearings
have
been
thoroughly
cleaned
,
spin
them
in
clean
new
light
machine
oil
until the
cleaner
or
Do
not
handle
the
bearings
with
A
16
Courtesy of NationalSwitchgear.com

GEI
-
88764
solvent
is
entirely
removed
.
Allow
this
oil
to
drain
off
and
then
re
-
pack
them
immediately
with
G
-
E
lubricant
D
50
H
15
being
sure
all
metal
parts
are
greased
.
The
removable seals
should
then
be
replaced
.
NOTE
:
If
it
becomes
necessary
to
clean
the
bearings
in
alcohol
(
shellac
thinner
)
,
be
sure
the
alcohol
is
perfectly
clean
,
and
do
not
allow
the
bearings
to
remain
in
the
alcohol
more
than
a
few
hours
.
If
it
is
desir
-
able
to
leave
the
bearings
in
the
alcohol
for
a
longer
time
,
an
Inhibit
-
ed
alcohol such
as
is
used for
anti
-
freeze
should
be
used
.
Even
then
the
bearings
should
be
removed from
the
alcohol
within
twenty
-
four
hours
.
Esso
Anti
-
Freeze
and
Du
Pont
Zerone
are
satisfactory
for
this
purpose
.
Precautions
against
the
toxic
effects
of
the
alcohol
must
be
exercised
by
wearing
rubber
gloves
and
by using
the
alcohol
in
a
well
ventilated
room
;
excessive
exposure
to
the
fumes
Is
sometimes
unpleasant
to
person
-
nel
.
Washing
the
bearings
in
the
light
oil
and
draining
should
follow
immediately
,
then
apply
the
lubricant
.
Bearings
that
are
pressed
into
the
frame
or
other members
such
as
the
eccentric
drive
bearings
(
7
)
Pig
.
15
should
not
be removed
.
After
re
-
moving
the
shaft
and
inner
race
the
bearing
can
usually
be
cleaned
satisfactorily
with
petroleum
solvent
or
a
similar
cleaner
and
a
stiff
brush
.
Follow the
procedure
outlined
above
using
a
light
machine
oil
and
G
-
E
lubricant
D
50
H
15
before
reassembling
the
inner
race
and shaft
.
Rolling
Surfaces
A
number
of
rolling
and
rubbing
surfaces
in
the
mechanism have
been
lubricated
with
a
baked
-
on
,
dry
,
molybdenum
disulfide
coating
.
This
requires
no
maintenance
and
should
last
the
life
of the
breaker
.
J
•
•
RECOMMENDED MAINTENANCE
FOR
MAGNE
-
BLAST BREAKERS
APPLIED
TO
REPETITIVE
SWITCHING
DOTY
.
~
1
.
Magne
-
blast
breakers
applied
to
repetitive operation
such
as
switch
-
ing
are
furnaces
and
motors
should
be
serviced
and maintained
ac
-
cording
to
the
following
schedule
:
A
.
Every
2000
Operations
,
or
Every
Six
Months
-
Whichever
Comes
First
1
.
Remove
the box
barriers
.
2
.
Wipe
all
insulating
parts
clean
of
smoke
deposit
and
du
3
t
with
a
clean
dry
cloth
,
including
the
bushings
,
and
the
inside
of
the
box
barriers
.
3
.
All
areas
in
the
throat
area
of the
arc
chute
should
be
thor
-
oughly
cleaned
by
using
sandpaper
.
This
cleaning
should
be
performed
any
time
the
arc
chute
is
removed
.
The
arc
chute
fins should
not
be
cleaned
.
Whenever
the
arc
chute
is
removed
,
loose
dust
and
dirt
should be
blown
out
before
replacing
arc
chutes
.
17
Courtesy of NationalSwitchgear.com

GEI
-
88764
4
.
Primary
Contacts
-
Inspect
the
condition
of
the
stationary
con
-
tact
fingers
and movable
contact
blocks
.
Badly
pitted
or
burn
-
ed
contacts
should be
replaced
.
(
Note
:
Burned
primary
contacts
indicate
the
probable
need
for
arcing
contact
replacement
)
.
If
the
contact
surfaces
are
only
roughened
or
galled
,
they
should
be
smoothed
with
crocus
cloth
or
draw
filed
.
After
contact
dressing
the
primary
contacts
should be
greased
lightly
with
D
50
H
47
.
5
.
Arcing
Contacts
-
When
the
arcing
contact
wipe
Is
less
than
the
minimum
specified
under
ADJUSTMENTS
,
the
contacts
should
be
re
-
placed
.
The
contacts
should
be
inspected
for
uneven
wear
and
/
or
damage using
a
mirror
to
inspect
the
stationary
contacts
.
Normally
it
will
not
be
necessary
to
remove
the
arc
chutes
for
this
2000
operation
servicing
unless
inadequate
wipe
or
contact
condition
indicate
a
need
for
replacement
.
When
the
arc
chutes
are
removed
,
the
contact
braids
,
coil
protectors
,
and
other
parts
subject
to
arcing
should
be
checked
for
possible
cleaning
or
replacement
.
Do
not
grease
the
arcing
contacts
under
any
circumstances
.
6
.
Check
the
breaker
and
mechanism
adjustments
as
summarized
under
INSPECTION
AND
TEST
.
The
necessary
readjustments
should
be
made
as
described
under
ADJUSTMENTS
.
7
.
The
breaker and
operating
mechanism
should be
carefully
inspect
-
all
cam
,
latch
ed
for
loose
nuts
,
bolts
,
retaining
rings
,
etc
and
roller
surfaces
should
be
inspected
for
damage
or
excessive
wear
.
•
*
>
The
buffer
blocks
and
their
retainers
on
the
bottom
of
the
stationary
contact
support
should
be
inspected
for
possible
need
of
replacement
.
8
.
The
contacts
of the
control
relay
should
be
inspected
for
wear
and
cleaned
if
necessary
.
9
.
Lubricate
the
breaker
operating
mechanism
in
accordance
with
the
table
under
LUBRICATION
.
10
.
Inspect
all
wiring
for
tightness
of
connections
and
possible
damage
to
insulation
.
11
.
After
the
breaker
has
been
serviced
,
it
should
be
slowly
closed
and
opened
,
as
described
in
INSTALLATION
,
to
be
sure
there
is
no
binding
or
friction
and that
the
breaker
contacts
can
move
to
the
fully
opened
and
fully
closed
positions
.
Its
electrical
operation
should then
be
checked
using
either
the
test
cabinet
or
the
test
couplers
.
18
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