Westinghouse DE-ION DH Series User manual

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32
-
150
-
.
3
A
RECEIVING
OPERATION
MAINTENANCE
MR
CIRCUIT
BREAKER
Type
BE
.
Horizontal
Drawout
Indoor
and
Outdoor
Service
INTERRUPTING
RATINGS
—
AMPERES
VOLTAGE
RATINGS
3
-
PHASE
INTER
-
RUPTING
RATING
MR
AMPERES
CQNTIN
'
CIRCUIT
BREAKER
Mill
.
KV
.
for
Rated
IJOIJS
MAX
.
At
TYPE
til
)
CYCLES
Rato
if
Mn
.
MV
A
.
Design
Rated
KV
.
INI
.
Amperes
KV
.
Voltage
MVA
.
50
-
DH
-
130
-
D
50
-
DIM
50
.
D
50
-
DH
4
I
30
-
D
ISO
4.76
3.6
-
600
4.16
21
,
000
21
,
000
21
,
000
36
,
000
36
,
000
20
,
000
20
,
000
40
,
000
40
,
000
6
,
300
6
,
300
10
,
600
10
,
600
21
,
000
21
,
000
26
,
000
25
,
000
25
,
000
37
,
500
37
,
500
32
,
000
32
,
000
44
,
000
44
,
000
13
,
000
13
,
000
22
,
000
2.2
,
000
23
,
000
2
:
3
,
000
150
4.16
4.76
3
,
5
‘
1200
150
4.16
4.76
3.5
2000
80
-
DHW
350
.
D
60
-
DH
'
'
250
'
D
250
4.16
4.16
4.76
3.85
1200
230
4.76
3.85
2000
75
-
DH
-
230
-
A
75
-
DH
-
250
-
A
250
4.6
7.2
.
8.25
'
0.23
1200
250
7.2
4.6
2000
75
*
DH
500
“
A
75
-
DH
-
50
Q
-
A
800
7.2
8
,
23
6.6
1200
500
6.6
7.2
8.25
2000
1
S
0
-
DH
-
130
-
A
ISO
-
DIM
50
-
A
150
13.8
13.0
6.6
600
150
13.8
15.0
6.6
1200
I
BO
-
DIM
!
50
-
A
1
B
0
-
DTI
-
250
-
A
250
13
,
8
18.0
6.6
1200
250
13.8
13.0
6.6
2000
IBO
-
DH
-
SOO
-
A
150
-
DH
-
B
00
-
A
300
13.8
18.0
11.5
1200
500
13.8
11.5
15.0
2000
WESTING
HOUSE
ELECTRIC
CORPORATION
SWIITCHGEAR
DIVBSII
0
N
EAST
PITTSBURGH
PLANT
SUPERSEDES
I
.
B
.
32
-
1
BO
-
3
EAST
PITTSBURGH
,
PA
.
MAY
,
19.03
(
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®
p
.
10
*
59
)
©
Pxiwknd
in
U
.
8
-
A
.
Courtesy of NationalSwitchgear.com

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When
communicating
with
Westinghouse
regarding
the
product
covered
by
this
Instruction
Book
,
include
all
data
contained
on
the
nameplate
attached
to
the
equipment
.
*
Also
,
to
.
facilitate
replies
when
particular
information
is
desired
,
be
sure
to
state
fully
and
clearly
the
problem
and
attendant
conditions
.
Address
all
communications
to
the
nearest
.
Weslirighouse
-
representative
'
as
listed
in
the
back
of
this
book
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For
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it
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all
nameplate
data
be
duplicated
and
retained
in
a
convenient
location
.
•
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Gins
oi
:
the
outstanding
improvements
in
modern
power
distribution
lias
been
the
development
of
the
air
cirpii
.
it
breaker
by
Westinghouae
for
distribution
circuit
voltages
.
On
circuits
where
the
duty
on
breakers
is
heavy
,
long
life
with
:
a
minimum
of
.
maintenance
makes
the
De
-
ion
air
breaker
an
outstanding
performer
.
In
the
type
DH
magnetic
De
-
ion
air
circuit
breakers
,
Westing
-
house
offers
a
complete
standard
line
for
circuits
from
2.3
to
IB
kv
.
Each
of
the
type
DH
air
circuit
breakers
is
three
-
pole
,
electrically
operated
,
and
is
built
as
a
complete
horizontal
drawoul
:
unit
for
metal
-
clad
switchgear
.
Breaker
units
of
the
same
rating
;
are
interchangeable
so
that
changing
breakers
is
a
.
.
matter
of
minutes
.
Since
they
are
drawn
out
horizontally
,
no
lowering
or
lifting
is
necessary
.
Steel
barriers
and
automatic
interlocks
prevent
contact
with
live
parts
while
the
breakers
are
being
changed
.
.
As
in
the
case
of
most
highf
voltage
electrical
equipment
,
these
breakers
should
be
inspected
and
maintained
at
regular
intervals
in
order
to
obtain
the
•
most
dependable
performance
.
(
£
»
!
>
Courtesy of NationalSwitchgear.com

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,
.
32
-
150
-
3
A
AIR
CIRCUIT
IBREARKR
M
1
m
i
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;
!
PSJ
A
barrier
assembly
is
-
placed
oi
>
.
the breaker
before
it
is
rolled
into
its
cell
.
The
front
.
sheet
is
of
one
-
eighth
high
steel
to
form
a
grounded
barrier
between
personnel
and live
parts
when
the
unit
is
in
the
cell
.
On
15
lev breakers
this
barrier
assembly
is
in
two
parts
for
convenience
in
handling
.
The
type
DH
air
circuit
breaker
is
a
three
-
pole
,
electrically
operated
,
horizontal drawout
unit
for
metal
-
clad
switchgear
.
In
.
the
type
designation
,
the
numbers
preceding
DH
indicate
the
voltage
rating
in
hundreds
of
volte
,
and
the
numbers
follow
-
ing
DH
indicate
tire
maximum
irxterruptmg
.
rating
in
thousands
of
leva
.
The
various
ratings
have
similar
structural
features
and
many
parts
in
common
.
Fig
,
1
shows
a
type
-
.
15
O
-
DH
-
250
A
breaker
with
the
main
,
barrier
assembly
and
one
arc
chute
re
-
moved
.
This
shows
clearly
the
arrangement
of
the
arc
chutes
and blowout
magnet
assemblies
,
,
the
con
-
tacts
and
insulated
operating
rods
,
and
the
solenoid
operating
mechanism
.
These
components
are
sup
-
ported
in
a
welded
steel
frame
mounted
on
flanged
wheels
for
guiding
it
into
the
metal
-
clad cell
.
.
In
the
lower
part
of
the
frame
also
is
located
the
levering
-
in
.
device
for
moving
the breaker
into
final
contact
engagement
.
This device
is
interlocked
with
the
.
mechanism
to
prevent
inserting
or
withdrawing
the
breaker with
the
contacts
closed
.
Also
located
in
the lower
part
of
the
frame
are
the
secondary
con
-
,
tacts
for
automatically
‘
disconnecting
the
control
wiring
when the breaker
is
withdrawn
,
the
auxiliary
•
switch
,
and other
auxiliary
devices
.
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FIG
.
L
Typo
1
B
0
-
DH
-
280
A
Circuit
Breakar with
Half
of
Main
Barrier
and
One
Arc
Chute
Removed
/
•
All
type
DH
breakers
are
assembled
and
given
operating
tests
at
the
factory
,
after
which
they
are
carefully
inspected
and
prepared
for
shipment
by
workmen
experienced
in
.
the
proper
handling
and
packing
of
.
electrical
equipment
.
In
order
to
afford
maxim
um
protection
against
damage
,
the
main
bur
-
ner
assembly
and the
arc
chutes
are
packed
sep
-
arately
.
For
each
,
three
-
pole
breaker
there
is
one
barrier
assembly
and
three
arc
chutes
.
After
the
equipment
has
been
unpacked
,
make
'
careful
-
inspection
for
any
damage
which
may
have
c
curved
in
transit
If
the
apparatus
has
been
damaged
,
file
a
claim
immediately
with
the
carrier
and
notify
the
nearest
Westing
house
Sales
office
,
HANDinro
.
Remove
the
crating
and
packing
carefully
to
•
avoid
damage
from
negligent
handling
of
crowbars
or
other tools
.
Use
a
nail
puller
for
the
uncrating
.
.
Care
must
be used
in
handling
the
arc
chutes
,
,
since
the
splitter
plates
within
them
are
made
of
a
ceramic
material which
may
break
if
dropped
.
The
base
of
the
crate
may
be
used
as
a
skid
for
moving
the
breaker
,
or
the
breaker
may
be
lifted
3
Courtesy of NationalSwitchgear.com

RECEIVING
,
HANDLING
AN
®
STORING
t
/
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.
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-
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J
w
;
,
.
„
wrl
1
„
with
slings
under
the
orate
.
II
the
breaker
is
to
be
Jilted
with
slings
,
move
it
while
it
is
still
crated
.
Alter
the
breaker
is
unpacked
,
the
best
way
to
move
it
is
by
rolling
it
on
its
own
wheels
,
;
H
it
is
necessary
to
lift
the
breaker
after
if
is
tmcrated
,
lilt
it
without
the
arc
chutes
or
;
barriers
in
,
place
.
Slings
may
be
placed
under
the
!
breaker
frame
.
or
in
holes
provided
in
the
frame
.
!
Use
a
spreader
to
prevent
th
©
cables
from
distorting
the
blowout
magnets
.
STORING
The
arcing
chambers
are
shipped
in
separate
containers
to
guard
against
damage
from
rough
handling
and
for
better
protection
,
from
dust
and
water
or
liquids
,
containers
until
ready
for
us
©
.
Store
all
components
of
these
breakers
in
a
clean
dry
place
..
During
the
storage
period
,
keep
them
sufficiently
warm
to
prevent
'
moisture
condensation
.
Store
them
in
their
shipping
TABLE
©
IP
APPROXIMATE
*
WEIGHTS
(
1
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Fm
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radte
)
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BARRIER
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1200
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1200
-
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160
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2075
1600
105
160
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1200
2000
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itursw
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AIM
*
,
INSTALLATION
With
the
exception
of
the
arcing
chambers
and
barriers
,
these
breakers
are
shipped
completely
{
assembled
and
adjusted
.
No
adjustments
should
be
required
and
none
should
be
made
unless
obviously
needed
.
!
i
When
the
breaker
has
been
removed
from
the
crate
,
remove
braces
which
support
the
blowout
magnet
pole
pieces
during
shipment
,
CmiMmw
Severe
injury
may
be
sustained
if
any
part
of
the
body
is
struck
by
the
con
-
tact
arms
since
they
move
very
rapidly
on
the
opening
stroke
.
Personnel
working
about
the
breaker
should
stay
clear
o
£
the
£
rpaco
in
which
the
contact
arms
move
while
breaker
is
closed
or
is
being
closed
,
.
If
breaker
has
been
closed
by
hand
,
always
remove
hand
closing
lever
before
trippixig
.
The
following
sequence
of
operations
should
be
performed
in
preparing
the
breaker
for
use
:
3
L
Breakers
are
usually
shipped
with
the
con
-
tacts
closed
and
with
a
tie
on
the
trip
lover
to
'
pre
*
grease
.
vent
tripping
.
Alter
the
breaker
is
unpacked
and
the
shipping
lies
and
braces
removed
,
lake
off
the
tie
on
the
trip
lever
and
trip
the
breaker
.
Then
close
the
breaker
carefully
by
hand
,
using
the
removable
hand
closing
lever
.
Make
certain
ilial
all
parts
are
functioning
properly
and
,
that
there
hi
no
binding
or
excessive
friction
.
As
the
contacts
touch
near
the
end
of
the
closing
stroke
,
the
force
necessary
to
close
the
breaker
increases
rapidly
.
2
>
n
With
the
breaker
hi
the
closed
,
position
,
check
the
contacts
to
make
certain
that
the
adjust
-
ments
have
not
been
disturbed
.
Iter
proper
settings
,
refer
to
the
section
of
Fig
.
6
which
matches
the
contact
,
design
of
the
breaker
being
'
installed
,
adjustments
are
required
,
they
may
be
made
as
described
on
page
9
.
,
K
A
light
film
of
grease
hi
applied
,
to
both
the
arcing
and
main
contacts
before
the
breaker
is
operated
at
the
factory
.
This
film
is
normally
removed
before
shipment
.
Before
the
breaker
is
placed
in
service
,
inspect
all
contacts
fence
.
that
they
are
free
oi
oil
or
l
Courtesy of NationalSwitchgear.com

UB
.
.
32
-
150
-
3
A
mSTALJLATION
AIR
CIRCUIT
BREAKER
3
*
The
breaker
is
more
easily
handled
with
the
arc
chutes
and
barriers
removed
;
'
mount
these
parts
alter
the
breaker
has
been
moved
near
the
melal
-
gia
d
c
ell
strue
l
:
ure
,
Before
installing
the
arc
chutes
,
play
a
stream
of
dry
compressed
air
through
them
from
each
,
end
to
remove
any
dust
,
or
.
foreign
matter
.
Then
examine
the
chutes
to
make
certain
that
the
vents
and
slots
are
open
and
free
from
foreign
material
.
Assemble
the
arc
chutes
on
the
breaker
by
removing
the
re
-
taining
straps
from
the
froxit
of
the
magnet
pole
pieces
and
sliding
the
chutes
into
position
,
making
sure
that
the
rear
arcing
horn
connectors
properly
engage
the
contacts
on
the
blowout
coils
.
After
a
chute
has
been
placed
in
'
position
,
make
sure
(
1
)
that
it
is
centrally
located
so
that
there
is
no
interference
with
the
travel
of
the
moving
con
-
tacts
and
(
2
)
that
it
is
securely
held
in
position
by
the
retaining
strap
with
top
of
the
chute
parallel
to
the
top
of
the
laminated
,
pole
faces
.
Connect
the
shunt
strap
to
the
front
arcing
horn
in
the
chute
.
Tighten
the
lower
connection
of
the
-
shunt
strap
since
:
it
may
have
loosened
during
transit
.
The
are
chute
is
now
completely
installed
.
Make
a
final
check
by
operating
the
breaker
slowly
by
hand
to
me
that
there
is
no
interference
in
the
movement
of
the
moving
contact
C
The
interpole
barrier
assembly
should
now
be
put
in
place
.
The
6
kv
breakers
have
a
one
piece
assembly
.
Blowout
magnet
mi
carta
channels
have
their
front
edges
beveled
to
help
guide
barrier
plates
into
place
.
.
The
lower
rear
comer
of
:
the
outside
mi
carta
plate
goes
inside
the
steel
gusset
of
the
frame
.
The
front
steel
sheet
of
the
barrier
assembly
is
'
centered
on
the
breaker
by
a
notch
on
the
bottom
edge
at
the
middle
,
which
should
engage
a
locating
pin
on
front
edge
of
breaker
frame
.
Two
bolts
at
lower
front
comers
hold
,
assembly
in
place
.
Because
of
size
and
weight
the
interpole
barrier
assembly
on
the
1
!
3
kv
breakers
is
divided
in
two
parts
.
Righ
t
half
goes
on
first
.
The
front
sleei
sheets
are
aligned
by
two
locating
pins
'
at
lower
front
•
•
corners
and
single
bolt
at
top
center
.
Two
bolts
at
lower
front
corners
hold
assembly
in
place
,
.
!
>
»
The
breaker
is
now
ready
to
bo
operated
electrically
.
Each
breaker
should
be
closed
and
tripped
electrically
several
times
before
being
con
-
nected
to
high
voltage
.
Those
operations
may
be
made
at
the
test
position
in
the
cell
or
by
means
of
.
other
test
facilities
provided
.
See
page
12
of
this
instruction
book
and
LB
.
32
-
150
*
4
,
page
33
,
for
information
concerning
placing
tlie
breaker
in
the
cell
.
The
hand
closing
lever
must
always
he
re
-
ft
m
Cv
i
in
I
#
mi
$
=
:
*
,
m
•
i
•
:
'
*
•
t
V
'
X
V
ft
/
J
?
)
j
frtJi
=
v
;
:
.
l
*
&
:
l
s
j
L
>
M
r
M
i
m
.
SIS
1
B
t
m
fmm
-
mamm
5
'
i
#
:
•
:
M
LigL
,
jsam
pa
?
.•
mi
iH
5
m
at
kfc
w
.
'
>
:
•
u
.
\
:
>
m
.
!
m
m
mm
5
iV
H
»
fi
'
'
-
V
,
:
.
_
•
»
-
•
*
'
A
?
-
1
—
FIO
.
2
,
Typical
Contact
Assembly
Shown
in
Closed
and
Latched
Position
moved
from
socket
in
mechanism
before
making
*
electrical
operation
.
If
electrical
operation
is
quick
and
positive
on
both
close
and
open
,
breaker
is
now
ready
to
be
levered
into
operating
position
.
'
•
Cat
&
ttoxi
:
Do
not
attempt
to
close
by
hand
,
against
axr
energized
circuit
,
any
breakers
covered
by
this
,
instruction
book
,
,
To
insure
sufficient
closing
force
and
speed
,
4
these
breakers
should
bo
closed
electrically
from
an
adequate
power
source
.
See
NEMA
Standard
SO
6
-
213
.
I
*
When
this
drawout
equipment
is
put
into
,
the
cell
and
moved
in
beyond
the
tost
position
,
the
high
voltage
parts
of
the
breaker
will
be
energized
*
If
the
barrier
is
completely
as
-
sembled
on
!
the
breaker
,
personnel
will
be
protected
from
contact
with
the
live
parts
.
If
,
however
,
the
barrier
assembly
is
left
off
and
the
breaker
rolled
into
the
cell
,
live
parts
exposed
.
The
breaker
should
never
bo
rolled
into
an
energized
cell
structure
beyond
the
test
position
without
having
the
complete
barrier
assembly
in
place
.
are
£
Courtesy of NationalSwitchgear.com

Before
adjusting
.
a
circuit
breaker
,
ii
.
is
advan
-
tageous
to
become
familiar
with
the
construction
and
function
of
the
various
parts
.
The
following
paragraphs
describe
the
operation
and
the
various
adjustments
which
can
be
made
.
This
material
should
be
studied
carefully
before
doing
any
work
on
the
breaker
.
The
general
arrangement
of
the
breaker
com
-
ponents
is
shown
in
Fig
.
1
.
The
solenoid
coil
is
built
to
exert
a
horizontal
force
on
the
mechanically
-
•
trip
-
free
linkage
.
This
linkage
,
in
turn
,
exerts
an
upward
force
on
the
pole
unit
insulating
operating
rods
.
The
moving
contact
arms
carry
the
main
,
intermediate
,
and
arcing
contacts
.
On
ripening
,
these
contacts
separate
in
the
order
named
;
on
closing
,
they
touch
in
the
reverse
order
.
£
On
the
outer
ends
of
the
condenser
bushings
are
clusters
of
finger
contacts
for
engaging
the
main
circuit
contacts
in
.
the
cell
.
Above
the
arcing
con
-
tacts
are
located
the
blowout
magnets
and
arc
chutes
.
The
breaker
is
tripped
by
lifting
the
trip
-
ping
trigger
either
manually
,
or
electrically
by
means
of
the
trip
coil
.
link
,
the
major
linkage
collapses
under
the
force
of
the
contact
springs
and
the
accelerating
springs
which
are
located
in
an
air
bumper
attached
to
the
trip
free
lever
,
The
junction
of
the
upper
and
lower
trip
free
.
links
moves
to
the
right
-
and
the
trip
free
lever
rotates
clockwise
,
thus
opening
the
breaker
.
The
position
of
the
linkage
is
then
that
shown
in
.
Figure
;
4
J
3
.
In
moving
to
this
position
the
roller
on
the
lower
trip
free
link
has
disengaged
lire
closing
latch
.
The
retrieving
'
springs
now
move
the
solenoid
core
which
moves
the
linkage
to
the
reset
position
shown
,
in
Figure
4
-
C
.
In
this
position
the
tripping
latch
is
reset
and
the
breaker
may
be
re
closed
.
as
MECHANISM
PANEL
The
mechanism
panel
is
mounted
on
the
front
of
the
closing
solenoid
,
mechanism
as
shown
,
in
Fig
,
3
.
On
it
:
are
mounted
,
the
following
auxiliary
devices
included
as
standard
on
all
breakers
:
$
Ipm
1
t
Trip
MaffpiieL
This
device
may
be
equipped
with
a
coil
lor
direct
curmet
or
-
alternat
-
ing
current
or
capacitor
tripping
.
OPERATING
-
MECHANISM
C
^
l
4
Mf
Swiiteliin
This
switch
causes
the
supply
to
the
closing
solenoid
to
be
cut
off
after
the
breaker
is
closed
.
Pwsiitikm
XMdteatoiv
This
device
gives
positive
'
indication
of
the
position
of
the
breaker
contacts
.
Offt
&
rafiaiii
-
Ctovmtev
*
This
counter
records
each
operation
,
of
the
breaker
.
The
solenoid
,
operating
mechanism
with
its
trip
-
free
linkage
is
shown
in
Fig
.
4
,
In
this
mechanism
the
horizontal
pull
of
the
solenoid
coil
is
transmitted
to
.
the
contact
,
operating
rods
through
.
a
system
of
links
which
rotates
counter
-
clockwise
about
the
operating
center
.
The
linkage
system
consists
of
four
major
links
:
th
©
non
-
trip
free
lever
,
trip
free
lever
,
upper
trip
free
link
,
and
lower
trip
free
link
.
These
members
are
arranged
as
shown
,
and
are
a
held
to
form
a
rigid
member
by
the
cam
link
and
tripping
cam
.
The
tripping
,
earn
is
held
,
fixed
by
the
tripping
latch
.
When
the
solenoid
is
energized
,
.
if
pulls
on
the
j
unction
of
the
non
-
trip
free
lever
and
the
lower
trip
free
link
,
causing
the
system
to
rotate
about
the
operating
center
.
The
trip
free
lever
theii
exerts
an
upward
force
on
the
operating
rods
through
the
cross
bar
to
close
the
breaker
.
The
breaker
!
is
held
.
in
this
position
by
the
closing
latch
and
the
tripping
latch
,
:
!
V
j
|
«
p
)
RAvyoufp
!
LATCH
CHECK
The
breaker
is
tripped
either
electrically
or
manu
-
ally
by
lifting
the
trigger
which
disengages
the
primary
latch
.
This
allows
the
tripping
latch
to
release
the
tripping
earn
so
that
it
.
.
is
free
to
rotate
.
Without
the
restraining
force
of
the
cam
and
cam
•
V
.
£
SWITCH
.
•
•
CUT
-
OFF
•
'
SHUNT
TRIP
SWITCH
•
:
MAGNET
-
*
.
.
w
•
u
.
FIG
.
3
.
Mechanism
Paruil
Courtesy of NationalSwitchgear.com

t
,
B
'
n
-
m
-
m
OPERATION
AM
®
ADJUSTMENT
AIR
CIRCUIT
BREAKER
i
»
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i
*
•
>
>
•
«
«
1
INSULATED
1
OPERATING
ROD
,
TRIP
FREE
LEVER
,
CROSS
BAR
TRIPPING
LATCH
,
OPERATING
CENTER
UPPER
TRIP
FREE
LINK
PRIMARY
LATCH
-
STATIONARY
CORE
MOVABLE
CORE
;
r
,
/
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RETRIEVING
C
-
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SPRINGS
TRIPPING
CAM
i
F
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r
NON
-
TRIP
-
FREE
LEVER
SOLENOID
COIL
LOWER
TRIP
CLOSING
FREE
LINK
LINKS
CLOSING
LATCH
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/
MAGNET
BACK
PLATE
CLOSING
LATCH
SPRING
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POSITION
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RESET
POSITION
TRIP
”
FREE
POSITION
.
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I
.
I
.
i
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.
ir
i
y
,
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nrAi
FIG
*
<
L
Solenoid
Operating
Meohantam
The
foliowmg
special
devices
may
also
be
mounted
on
ihe
mechanism
panel
when
required
:
Underroltagre
Trip
MfcMfaMeisai
*
This
is
a
.
magnetically
held
device
*
which
when
released
will
trip
the
breaker
using
energy
stored
in
a
spring
during
the
mechanism
retrieving
'
motion
.
For
in
-
stantaneous
release
,
,
the
holding
magnet
coil
may
be
connected
to
d
-
c
with
a
series
resistor
to
suit
the
voltage
or
it
may
be
supplied
with
low
voltage
d
-
c
from
an
a
-
o
control
voltage
through
a
small
transformer
and
rectox
assembly
mounted
in
fixe
cell
structure
.
For
time
delayed
release
,
a
special
very
high
resistance
coil
is
used
in
the
holding
magnet
and
it
is
supplied
with
about
300
volts
d
-
c
from
a
transformer
,
rectox
,
and
;
capacitor
assembly
mounted
in
the
cell
.
The
capacitor
is
connected
across
the
coil
and
provides
a
slowly
decaying
holding
current
.
See
Descriptive
Data
sheet
33
-
131
.
The
holding
magnet
is
-
mounted
on
the
mechanism
.
panel
to
the
left
of
the
shunt
trip
magnet
.
U
7
JJ
Courtesy of NationalSwitchgear.com

OPERATION
AND
ADJUSTMENT
may
be
that
tripping
latch
roller
cannot
drop
into
cam
notch
.
Remove
front
half
of
horizontal
panel
forming
seat
of
.
the
chair
in
the
frame
.
1
This
gives
easy
access
to
the
gap
.
Using
hand
closing
lever
,
close
breaker
.
part
way
,
trip
,
and
than
slowly
'
re
-
trieve
moving
core
.
Note
whether
or
not
tripping
latch
roller
drops
into
cam
notch
.
U
If
necessary
to
increase
clearance
to
get
inch
minimum
,
remove
front
panel
as
follows
.
Remove
spring
from
•
operating
arm
of
counter
,
four
bolts
and
then
turn
panel
as
though
hinged
at
left
edge
to
prevent
damage
to
wiring
,
‘
Set
out
of
way
as
shown
on
Fig
.
5
.
There
is
no
need
to
remove
wiring
.
The
non
trip
free
lever
stop
is
now
acces
-
sible
,
Loosen
lock
nut
and
adjust
stop
bolt
until
cam
-
to
roller
dea
ranee
is
within
limits
.
Hand
closing
lever
should
be
out
of
socket
during
this
adjustment
.
When
returning
panel
,
be
sure
to
get
cutoff
swi
1
oh
arm
into
correct
position
through
window
.
Remove
NON
TRIP
-
FREE
LEVER
STOP
•
V
.
.
.
FIG
.
3
.
Operating
Mechanism
—
Panel
Removed
JLatelh
©
hedk
Swilttflu
When
a
breaker
is
to
be
automatically
reclosed
after
being
tripped
free
,
it
is
necessary
to
arrange
the
electrical
control
,
scheme
so
that
the
closing
solenoid
will
not
be
energized
to
start
,
the
closing
motion
until
the
mechanism
has
completed
the
linkage
motions
to
get
to
the
reset
'
position
.
See
"
B
"
and
"
C
"
of
Fig
.
4
.
For
this
purpose
,
a
switch
is
arranged
to
be
closed
when
the
primary
latch
or
trigger
handle
moves
to
the
reset
position
-
because
the
trigger
is
the
last
part
to
move
in
the
sequence
of
linkage
.
motions
required
to
reset
the
mechanism
.
To
keep
necessary
tripping
force
small
,
the
resetting
spring
torque
-
used
on
the
trig
-
ger
is
small
.
.
Therefore
,
the
latch
check
switch
.
is
a
small
,
light
force
,
snap
action
switch
.
Sea
Fig
.
3
.
CwMMf
Switoku
Operation
of
this
switch
must
occur
at
proper
time
in
closing
stroke
.
Contacts
must
make
positively
before
end
of
motion
so
that
current
will
always
be
cut
off
.
'
In
other
direction
,
cut
off
must
,
not
occur
too
early
in
stroke
or
mech
-
anism
might
fail
to
complete
dosing
.
stroke
,
Proper
action
will
be
obtained
when
switch
plunger
has
1
^
2
f
°
Vs
"
hioli
over
Ira
vel
.
In
other
words
,
between
position
where
contacts
touch
and
position
,
with
breaker
closed
and
latched
at
rest
,
there
should
be
fa
to
\
/
\
)
inch
motion
of
switch
plunger
.
Ordinarily
no
adjustment
is
required
.
The
resilience
provided
in
the
operating
arm
,
by
leaf
springs
,
prevents
damage
to
the
switch
oil
the
mechanism
overtravel
.
If
.
it
should
be
necessary
to
change
switch
contact
-
ing
time
,
hand
rear
heavy
portion
of
switch
opera
-
ting
arm
.
Do
not
bond
leaf
springs
.
i
MECHANISM
.
ADJUSTMENTS
The
mechanism
in
the
Type
DH
air
j
circuit
breaker
is
adjusted
at
the
factory
and
is
designed
to
give
long
trouble
-
free
performance
.
Do
not
make
any
adjustment
unless
faulty
operation
is
observed
.
-
TrippliM
®
Isaitchier
If
a
breaker
fails
to
close
contacts
although
the
moving
core
of
the
mechanism
.
.
moves
to
the
closed
position
,
a
probable
cause
is
failure
to
reset
.
Refer
to
"
(
J
”
,
Fig
.
4
.
The
gap
indicated
bet
ween
tripping
latch
roller
and
J
cam
is
an
essential
requirement
to
permit
tripping
latch
roller
to
fall
into
cam
notch
.
Watch
trigger
handle
(
with
words
"
lift
to
trip
”
)
*
It
should
return
to
horizontal
position
immediately
after
breaker
has
opened
.
.
.
If
trigger
.
is
prevented
,
from
,
returning
to
full
reset
condition
by
primary
latch
roller
above
,
it
,
j
cause
Latelt
©
ln
&
idk
Swiftflau
The
action
of
this
,
switch
may
be
checked
as
follows
.
Breaker
being
open
,
raise
the
trigger
'
T
.
ili
to
Trip
”
arm
to
end
of
.
travel
.
Lower
slowly
,
listening
for
snap
action
.
Note
posi
-
tion
of
arm
when
switch
snaps
closed
.
Switch
should
close
when
trigger
arm
is
in
interval
%
to
Vs
inch
,
above
normal
reset
rest
position
measuring
at
the
shunt
trip
plunger
centerline
.
A
convenient
.
method
of
.
measuring
this
is
to
raise
and
lower
trigger
arm
by
pushing
'
with
the
trip
plunger
and
making
pencil
marks
on
the
plunger
rod
.
If
.
breaker
is
out
of
cell
,
switch
action
may
be
indicated
,
elec
-
trically
from
drawout
pings
number
17
and
18
.
switch
action
must
be
made
earlier
or
later
,
bend
switch
,
arm
near
the
middle
of
its
length
*
If
i
X
*
Courtesy of NationalSwitchgear.com

I
.
B
.
32
-
150
-
3
A
OPERATION
AMU
ADJUSTMENT
AIR
CIRCUIT
BREAKER
arcing
contacts
have
been
adjusted
.
With
the
break
-
er
in
the
closed
,
latched
position
,
set
the
stop
nuts
on
these
studs
so
that
there
will
be
one
-
sixteenth
inch
clearance
between
face
of
nut
and
the
back
of
the
moving
contact
arm
.
CONTACT
ADJUSTMENT
b
"
,
Four
designs
of
contacts
are
shown
in
ua
"
"
o
"
and
"
d
"
of
Fig
,
6
on
page
1
L
The
different
designs
are
used
on
different
ratings
.
Compare
the
breaker
to
be
adjusted
with
the
four
views
in
Fig
.
6
and
choose
the
one
which
applies
.
\
i
II
no
clearance
is
present
at
these
points
,
main
contact
pressure
may
he
be
lacking
or
absent
,
thus
forcing
load
current
through
the
intermediate
and
.
arcing
contacts
.
This
can
result
,
in
overheating
and
damage
to
the
contacts
.
If
new
contacts
are
being
.
installed
or
if
the
contacts
have
boon
smoothed
,
it
is
well
.
to
operate
the
breaker
electrically
several
times
so
that
the
surfaces
assume
their
permanent
shape
before
this
adjustment
is
made
.
Fig
.
.
-
6
«
a
«
In
this
design
,
bridge
,
contacts
are
resilienttly
attached
to
the
moving
contact
arm
by
means
of
.
two
studs
with
adjustable
nuts
behind
the
moving
ami
,
The
three
sets
of
contacts
,
mam
,
inter
-
mediate
and
arcing
part
in
that
order
,
and
when
,
closing
,
touch
in
the
reverse
order
.
The
main
contacts
are
made
from
a
silver
-
nickel
alloy
.
The
intermediate
and
arcing
contacts
are
made
from
a
.
tungsten
silver
alloy
,
which
has
high
resistance
to
erosion
by
the
arc
.
The
stationary
intermediate
and
arcing
contacts
are
brazed
to
a
casting
mounted
on
springs
on
the
upper
bushing
.
The
casting
is
connected
to
the
bushing
by
a
flexible
shun
!
:
,
and
is
supported
between
guide
plates
with
,
atop
surfaces
so
arranged
that
on
breaker
opening
motion
the
arcing
contact
:
follows
the
moving
con
-
tact
farther
and
thus
parts
last
.
In
addition
to
the
contacts
,
the
moving
contact
arm
also
carries
the
puffer
which
supplies
a
puff
of
air
through
the
nozzle
under
the
moving
arcing
contact
each
time
the
breaker
operates
.
This
air
serves
to
speed
circuit
interruption
ai
low
currents
where
the
effect
of
the
magnetic
blow
-
out
coils
'
ia
lessened
.
It
has
no
appreciable
effect
m
opening
high
cur
-
rents
.
Figu
6
-
bn
*
In
this
contact
design
,
the
moving
con
-
tact
arm
and
the
puffer
cylinder
are
-
cast
in
one
The
;
springs
which
,
apply
pressure
to
the
piece
,
main
moving
contacts
are
hidden
iu
a
recess
in
the
moving
arm
casting
.
In
Fig
.
6
-
b
,
note
that
there
is
an
elongated
hole
,
hidden
from
view
,
in
each
main
contact
bridge
.
There
is
just
one
adjustment
on
this
contact
arrangement
,
namely
the
pushrod
length
.
This
length
must
be
such
that
the
pin
.
through
the
con
-
tact
bridges
,
moves
approximately
Vfo
inch
from
the
end
of
the
elongated
hole
in
the
bridge
when
breaker
is
closed
and
latched
.
To
determine
that
adjustment
is
correct
,
measure
relative
motion
.
of
bridge
into
contact
arm
casting
.
With
hand
closing
lever
,
move
1
contact
arms
toward
closed
position
until
main
contacts
are
just
about
to
touch
.
Measure
relation
of
bridge
inner
curved
,
surface
to
machined
edge
of
contact
arm
casting
near
pin
.
Close
and
latch
contact
.
Repeat
measurement
.
Bridge
should
move
into
contact
arm
Vie
inch
.
'
When
necessary
to
readjust
,
change
pushrod
length
by
moving
nuts
at
lower
end
of
rod
where
it
attaches
to
crossbar
.
Be
careful
to
lock
nuts
tightly
after
finishing
ad
-
jus
linen
t
.
Arcing
Contacts
.
To
assure
the
proper
com
-
pression
in
,
the
arcing
contact
springs
,
these
con
-
tacts
should
be
adjusted
so
that
,
with
the
breaker
.
closed
,
the
dimension
from
the
contact
surface
to
the
front
surface
of
the
stud
block
is
between
IL
Vfo
and
IT
*
4
inches
.
This
adjustment
is
made
by
turning
the
nuts
which
,
attach
the
insulating
opera
-
ling
rod
to
the
crossbar
.
%
When
the
contacts
have
been
properly
adjusted
,
the
arcing
contacts
should
touch
on
all
three
poles
'
at
approximately
the
same
time
in
the
closing
stroke
.
It
is
satisfactory
,
if
,
when
the
first
polo
touches
,
the
greater
distance
between
arcing
con
-
tacts
on
other
two
poles
is
not
more
than
one
-
fourth
inch
.
Fiig
»
6
*
’
©
-
In
this
contact
design
,
the
main
mov
-
ing
contact
is
bolted
solidly
to
the
moving
contact
•
arm
.
All
resilience
is
put
in
the
stationary
contact
members
.
Conductivity
from
lower
bushing
to
mov
-
ing
main
contact
is
through
a
flexible
shunt
at
con
-
tact
arm
hinge
point
.
Lower
main
and
upper
main
contacts
are
mad
©
of
a
high
conductivity
silver
alloy
.
The
arcing
contacts
are
made
of
an
arc
refractory
tungsten
silver
alloy
.
The
stationary
arcing
,
and
upper
main
contacts
are
brazed
to
a
casting
which
is
supported
between
Main
Contacts
.
Che
main
contact
bridges
are
held
in
place
on
the
moving
contact
arm
by
studs
which
pass
through
the
main
contact
springs
.
Ad
-
justment
of
the
.
main
contacts
should
be
made
after
Courtesy of NationalSwitchgear.com

OPERATION
AND
ADJUSTMENT
a
aiHWSMIUirtJHiiUMUM
*
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ons
.
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<
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two
guide
plates
which
are
part
of
the
lower
main
stationary
contacts
.
The
upper
main
and
arcing
contact
casting
in
connected
to
the
bushing
block
by
a
flexible
shunt
and
it
is
backed
by
contact
The
side
plates
carrying
the
ductivity
silver
alloy
.
Arcing
contacts
axe
made
ol
an
arc
refactory
tungsten
silver
alloy
.
The
stationary
arcing
and
main
contacts
are
brazed
to
a
casting
which
is
supported
between
two
guide
plates
that
in
this
case
are
rigidly
bolted
to
the
bushing
block
.
This
stationary
contact
casting
is
connected
to
the
bushing
block
with
a
.
flexible
shunt
and
the
casting
is
backed
by
contact
pressure
springs
.
Note
that
"
the
travel
of
the
stationary
main
contact
should
,
be
VB
hick
plus
or
.
minus
Adjustment
for
this
is
obtained
by
means
of
the
nuts
at
lhe
lower
end
of
th
e
ope
r
a
ting
rod
s
.
pressure
springs
,
lower
main
contact
are
pivoted
at
the
upper
mount
-
ing
pin
.
At
the
lower
pin
hole
,
clearance
is
allowed
so
that
plate
may
move
giving
some
resilience
to
the
lower
main
contact
.
The
surface
of
the
side
plates
next
,
to
the
basiling
block
is
silver
plated
is
the
block
.
The
plates
are
pressed
against
the
block
with
springs
on
the
mounting
pins
.
|
Holes
in
the
side
plates
engage
small
bosses
on
the
stationary
arcing
contact
casting
to
form
stops
for
the
casting
so
that
the
proper
sequence
in
contact
parting
is
obtained
.
as
MW
CUVVBU
Am
BLOWOUT
MAGNETS
Th
©
arc
chute
on
the
type
DH
air
circuit
breaker
consists
of
an
assembly
of
insulating
refractory
plates
enclosed
in
a
rectangular
Micarta
tube
or
jacket
In
position
on
the
breaker
,
the
.
jacket
is
between
the
poles
of
the
blowout
magnet
and
the
lower
end
Is
immediately
above
the
arcing
contacts
.
The
refractory
plates
have
inverted
V
-
shaped
slots
starting
immediately
over
the
arcing
contacts
so
that
the
arc
is
drawn
into
these
slots
.
The
slots
in
the
plates
are
alternately
off
center
on
opposite
sides
to
increase
the
length
,
of
the
arc
path
as
the
arc
progresses
up
the
chute
.
Inside
the
front
and
rear
surfaces
of
the
chute
are
metallic
arcing
horns
to
which
the
arc
transfers
from
the
arcing
contacts
.
The
front
horn
is
con
-
nected
electrically
to
lhe
moving
contact
,
the
rear
horn
through
the
blowout
coil
to
the
stationary
contact
Thus
when
the
arc
transfer
*
!
to
the
horns
the
blowout
coil
is
included
in
the
circuit
.
The
action
of
the
breaker
in
interrupting
an
arc
is
shown
ra
Fig
.
7
.
When
the
arcing
contacts
separate
,
an
.
arc
is
drawn
between
them
without
the
blowout
coil
carrying
current
as
indicated
by
position
L
The
arc
rises
rapidly
from
this
position
under
the
influence
of
magnetic
forces
and
.
thermal
air
currents
.
These
cause
the
arc
to
impinge
on
'
the
arcing
horns
,
thus
including
the
blowout
coil
in
series
with
,
the
arc
.
When
current
starts
to
flow
in
the
blowout
,
coil
,
the
arc
is
driven
very
rapidly
into
the
slats
in
the
refractory
plates
by
the
magnetic
field
.
Successive
positions
of
the
arc
are
shown
in
Fig
.
7
.
Because
the
slots
are
staggered
,
the
arc
is
lengthened
as
it
progresses
up
the
chute
by
being
extended
laterally
from
one
slot
to
the
next
,
exposes
a
large
part
of
the
arc
to
the
relatively
cool
surfaces
of
the
plates
and
to
the
deuoruzing
effect
of
the
blowout
:
magnet
field
,
which
results
in
fast
and
positive
interruption
of
the
circuit
.
Side
Plates
.
Two
different
designs
of
-
contact
side
plates
have
been
supplied
for
the
contact
de
-
sign
shown
in
Fig
.
6
-
c
.
(
See
Fig
,
6
-
c
,
Details
nX
"
and
"
Y
"
b
Compare
breaker
being
die
eked
,
with
X
and
Y
of
the
detail
.
Note
the
difference
m
the
On
De
-
shapes
of
the
holes
in
these
side
plates
,
tail
"
X
"
,
the
lower
main
contact
should
travel
Vfr
>
.
inch
(
minus
zero
,
plus
b
^
>
)
.
On
Detail
.
VIY
"
,
the
lower
main
contact
should
travel
inch
(
minus
zero
,
plus
Vk
?
,
)
.
.
’
Adjustment
to
gel
these
travels
is
obtained
by
means
of
the
nuts
at
the
lower
end
of
the
operating
rods
.
Tire
arcing
contacts
of
the
three
poles
should
touch
at
approximately
the
same
time
,
but
it
will
be
satisfactory
if
,
when
the
first
pole
touches
,
the
greater
distance
at
either
of
the
other
poles
does
not
gx
.
eead
*
4
inch
,
Correct
main
contact
travel
is
more
important
than
simultaneous
touching
of
the
three
poles
.
When
replacement
lower
main
.
contacts
are
ordered
,
they
will
be
supplied
on
side
plates
as
shown
in
Detail
"
Y
"
.
If
original
plates
are
like
Detail
nX
"
,
sufficient
pieces
should
be
ordered
to
change
both
sides
on
all
.
poles
of
a
breaker
.
Fig
.
2
on
page
5
is
a
photo
of
the
same
contact
assembly
as
that
shown
in
Fig
.
6
-
c
.
The
contacts
are
in
the
closed
and
latched
position
.
When
the
con
-
tacts
open
,
the
lower
mains
part
first
,
Ikon
upper
mains
,
and
finally
the
arcing
contacts
part
.
When
the
contacts
close
,
the
'
arcing
contacts
touch
first
,
,
‘
then
upper
mains
,
,
and
finally
the
lower
mains
.
PSgf
*
6
-
‘
dL
In
this
contact
design
,
the
moving
con
-
tacts
are
solidly
bolted
to
the
moving
contact
arm
.
All
resilience
is
put
in
the
stationary
contact
mem
-
Conductivity
from
,
.
lower
bushing
to
moving
main
contact
is
through
a
flexible
shunt
at
|
contact
arm
hinge
point
.
Main
contacts
are
of
a
high
con
-
This
lAif
if
#
Courtesy of NationalSwitchgear.com

I
.
B
.
32
-
150
-
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AIR
CIRCUIT
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MOVING
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XV
s
s
'
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ROD
INSULATING
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ROD
AinlFillMi
O
o
FIG
.
6
-
d
LOWER
MAIN
CONTACT
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o
/
O
o
'
r
!
3
/
32
MIN
"
’
I
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O
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-
*
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16
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;
1
,
*
-
3
/
32
MAX
:
1
,
^
r
•
^
-
MOTION
BETWEEN
CLOSED
AND
OPEN
*
-
k
-
'
1
-
^
«
-
4
“
FIG
.
6
.
Different
Breaker
Contact
DeaigxT
»
.
Contact
Adjustment
Dimexisiona
ior
Four
tir
uy
,
r
Side
Plates
Two
Styles
oi
Coxita
<
d
Guide
Side
Plates
as
Shown
Above
Have
Boon
Supplied
on
This
Contact
Design
Only
.
(
Compare
the breaker
to
he
adjusted
with
the
four
views
on
this
page
and
choose
the
one
which
applies
.
)
•
“
-
1
*
" '
T
M V
*
IT
*
K
*
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n
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rn
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-
r
.
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«
K
|
!
>
>
«
•
'
FIG
.
6
-
o
)
Courtesy of NationalSwitchgear.com

OPERATION
AMID
ADJUSTMENT
AttauiuM
o
lrwiwteJitoi
.
-
B
-
imf
-
,
*
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BLOWOUT
MAGNET
CORE
BLOWOUT
COIL
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REAR
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.
.
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,
a
„
FIG
.
7
.
Arc
Chute
and
Blowout
Go
-
51
.
;
HORIZONTAL
'
BRAWQUT
ARRANGEMENT
connector
block
arranged
to
plug
into
a
mating
block
mounted
on
.
the
cell
,
neotor
block
-
is
mounted
on
a
movable
bracket
i
.
Jus
secondary
.
con
-
All
type
DH
air
,
circuit
breakers
are
arranged
or
use
in
metal
-
olad
equipment
from
which
they
may
be
drawn
out
horizontally
.
As
may
be
seen
in
Fig
.
9
,
all
parts
are
supported
on
a
steel
frame
with
four
wheels
with
roller
bearings
to
facilitate
moving
the
breaker
,
a
nd
flanges
which
engage
with
rails
to
align
the
breaker
in
the
cell
.
The
main
conductors
project
horizontally
from
the
rear
of
the
breaker
,
and
are
.
supported
and
insu
-
lated
from
the
steel
back
plate
of
the
frame
by
Micaita
condenser
bushings
.
On
the
ends
of
these
main
conductors
are
circular
clusters
of
contact
Angers
arranged
to
engage
-
the
circular
bar
con
-
ductors
in
the
cell
.
.
;
;
The
control
circuit
wiring
also
is
arranged
.
for
drawout
disconnection
by
means
of
an
18
-
point
on
/
i
SECONDARY
"
CONNECTOR
PLUG
EXTENDED
SOLENOID
BACKPLATE
FIG
,
ft
,
Seurmcl
&
ry
Connector
Plug
KxtiuuU
'
id
12
i
Courtesy of NationalSwitchgear.com

US
,
32
-
150
-
3
A
OPERATION
AND
ADJUSTMENT
AIR
CIRCUIT
BREAKER
jaw
engages
;
a
copper
bar
which
is
mounted
in
the
cell
and
connected
to
the
cell
ground
bus
,
ILevemtfjblit
Device
.
In
order
to
move
the
;
'
breaker
in
or
out
of
the
cell
against
the
resistance
of
tlxo
contact
fingers
,
a
levering
-
in
device
is
pro
-
vided
on
each
breaker
.
There
-
is
a
lever
on
each
side
mounted
on
a
common
shaft
across
the
back
of
the
breaker
.
:
On
each
lever
is
a
roller
,
which
,
en
-
gages
a
groove
on
the
side
wall
of
the
cell
,
removable
crank
engages
another
shall
at
the
right
front
comer
of
the
breaker
which
turns
the
levers
through
a
worm
gear
arrangement
.
Before
a
breaker
is
rolled
into
a
cell
,
the
lovers
with
rollers
at
each
side
of
the
breaker
must
,
be
at
their
rear
and
slightly
down
position
as
shown
In
,
Fig
.
10
.
The
position
of
the
levers
shown
in
Fig
.
9
ia
that
which
the
levers
take
after
the
breaker
is
cranked
into
;
operating
position
.
To
put
the
levers
in
the
position
shown
in
Fig
.
10
,
place
the
crank
on
the
operating
shaft
at
front
right
corner
of
breaker
.
•
Press
in
and
rotate
to
engage
slot
.
Breaker
must
be
open
to
engage
slot
.
Rotate
crank
counterclockwise
to
the
end
of
travel
against
:
solid
stop
.
With
levers
T
T
nlJI
iHi
•
ji
.
'
*
r
i
.
:
y
i
;
A
=
'
to
V
*
:
.
W
i
*
.
.
J
.
-
C
.
•
A
-
VW
*
m
wp
m
*
'
*
llv
U
5
»
;
.
\
v
•
mm
.
.
.
\
it
«
S
L
*
Ip
!
W
?
-
W
-
:
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•
mji
:
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•
ft
MV
.
•
•
•
•
r
.
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r
:
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•
•
••
.
.
.
.
.
.
.
to
’
:
1
t o
-
.
*
A
*
m
'
v
\
.
FIG
,
9
.
R
«
ai
'
Viww
of
150
-
DH
*
.
260
Cirauit
Bicoakexv
.
•
:
•
.
•
iri
'
c
-
WiW
Vj
^
V
.
•
•
4
v
-
V
•
W
:
pc
iiii
mm
.
y
,
-
r
ill
;
•
V
,
v
.
-
.
v
/
y
the
lower
.
1
eft
-
ha
.
nd
.
side
of
the
breaker
frame
,
.
This
permits
the
plug
-
in
connector
to
be
eactended
to
the
rear
'
of
its
normal
position
so
that
the
control
circuits
may
bo
connected
and
the
breaker
operated
elec
-
trically
while
the
main
contacts
are
disengaged
.
See
Fig
.
8
.
This
test
position
occurs
at
the
outer
limit
:
ol
breaker
travel
obtained
by
operation
of
the
lever
-
mg
-
in
device
crank
.
If
it
is
desired
to
connect
the
control
circuits
when
the
breaker
has
been
cranked
to
this
position
,
pull
out
the
secondary
contact
locking
.
pin
shown
in
Fig
*
4
.
While
holding
this
pin
out
,
push
,
the
secondary
contact
bracket
toward
the
rear
of
the
breaker
until
the
secondary
contacts
engage
fully
.
The
main
barriers
may
be
removed
and
the
breaker
operated
safely
in
this
position
since
the
main
contacts
are
disconnected
.
When
the
breaker
is
in
the
cell
far
enough
to
be
connected
to
the
high
’
voltage
bus
,
the
frame
work
of
the
breaker
is
effectively
grounded
by
a
special
connector
located
immediately
above
or
below
the
secondary
plug
-
in
connector
block
.
'
This
connector
•
.
r
:
.
.
w
;
W
-
v
"
•
•
i
,
•
•
rV
-
r
;
.
%
-
v
.
fit
;
-
V
*
Si
*
'
;
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;
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;
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:
WSfHITTEfU
:
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mmuimS
:
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fey
fey
•
•
WA
-
>
ISlf
:
;
-
;
Wwa
;
c
,
.
•
•
FIG
.
10
.
Roar
View
of
50
-
DH
-
2
S
0
D
Breaker
Ready
to
Roll
Into
Cell
\
s
a
•
»
ROLLER
AN
[
)
LEVER
|
3
’
:
'
9
P
RING
-
IN
DEVICE
-
1
'
to
!
.
;
Sz
*
Wv
:
'
A
-
.
:
;
-
*
Courtesy of NationalSwitchgear.com

OPERATION
-
AMIS
ADJUSTMENT
Remove
arank
.
If
:
the
cranking
operation
completed
,
,
removal
of
:
the
crank
will
permit
:
the
interlock
pin
,
see
Fig
.
5
(
also
"
A
"
,
Fig
.
36
in
LB
.
32
-
150
-
4
)
,
to
withdraw
from
tire
trip
-
free
lever
in
the
mechanism
.
To
remove
a
breaker
from
operating
position
,
firs
I
:
check
that
.
breaker
has
been
opened
.
Put
crank
on
operating
shaft
Push
and
rotate
to
engage
.
Turn
oourrleratockwi
.
se
until
slop
is
reached
.
Re
-
move
crank
.
Again
the
Interlock
pin
will
withdraw
from
'
the
trip
-
free
lever
if
the
cranking
operation
was
completed
.
Breaker
may
now
be
operated
at
.
the
test
position
or
rolled
out
of
cell
.
to
the
rear
and
down
as
in
Fig
.
10
the
breaker
is
ready
to
be
rolled
into
cell
as
far
as
the
test
position
.
The
rollers
on
the
levers
strike
a
vertical
angle
on
the
cell
wall
and
stop
'
the
breaker
at
the
test
posi
-
tion
.
If
the
breaker
is
to
be
operated
at
this
position
,
remove
the
crank
,
and
push
in
the
secondary
con
-
trol
connector
as
.
previously
described
.
.
To
move
breaker
from
test
position
into
fully
en
-
gaged
operating
position
,
put
crank
on
shaft
1
.
Push
In
and
rotate
to
engage
.
Crank
clockwise
.
Torque
required
will
increase
slightly
when
primary
con
-
nector
fingers
engage
the
stud
in
the
cell
,
Con
-
tinue
cranking
until
lever
shaft
meets
solid
stop
.
was
-
MAINTENANCE
Westi
.
ngh
.
ous
©
type
DH
air
circuit
breakers
are
designed
to
have
a
long
life
with
a
minimum
of
maintenance
when
operating
duty
is
ordinary
or
However
,
the
operating
-
duty
will
vary
lines
®
’
of
the
interrupter
especially
if
there
are
many
fault
current
interruptions
.
Large
cu
rrent
a
res
glaze
the
ceramic
surfaces
inside
the
arc
?
chute
.
but
leave
them
,
clean
electrically
.
On
the
other
hand
,
frequent
operation
,
at
low
or
medium
currents
(
about
1000
amperes
or
less
)
tends
to
cause
the
accumula
-
tion
of
soot
and
condensed
metal
on
the
parts
inside
the
arc
chute
,
particularly
on
the
ceramic
arc
shields
near
the
contacts
.
These
deposits
may
be
conducting
and
may
have
to
be
removed
as
ex
-
plained
later
under
"
Arc
Chutes
"
.
Breakers
which
have
opened
large
fault
currents
near
the
-
maximum
,
rating
,
should
,
be
inspected
as
soon
-
as
practical
.
The
condition
of
the
contact
surfaces
and
the
contact
pressure
-
adjustments
should
'
be
checked
.
(
See
page
15
,
“
Contacts
"
.
)
Also
the
interior
of
the
arc
chutes
should
,
he
im
spooled
for
cleanliness
,
degree
of
erosion
,
etc
.
For
breakers
,
which
operate
very
frequently
such
as
those
on
motor
starling
and
arc
furnace
switching
,
more
maintenance
will
he
required
especially
when
breaker
opens
large
fault
currents
as
well
as
or
-
dinary
load
currents
.
Until
experience
has
been
acquired
on
such
an
application
,
inspection
should
be
scheduled
at
least
every
two
months
or
every
2500
operations
whichever
comes
sooner
,
inspection
,
such
breakers
will
need
close
checking
of
:
contact
and
mechanism
wear
.
Also
they
may
need
cleaning
in
the
arc
chutes
and
re
-
adjustments
in
the
m
e
a
har
.
it
sm
.
average
.
greatly
as
to
frequency
of
operation
and
as
to
size
and
power
factor
-
of
current
interrupted
,
with
the
many
types
of
applications
of
these
breakers
.
There
-
fore
,
the
frequency
of
inspection
and
the
amount
of
maintenance
for
any
particular
application
must
be
chosen
with
due
regard
to
the
kind
of
duty
a
breaker
is
performing
.
'
The
following
remarks
are
intended
as
a
general
guide
.
Experience
on
a
particular
application
may
show
a
need
for
different
mainte
-
nance
practices
.
Breakers
which
operate
only
a
few
times
par
year
with
light
to
medium
currents
being
interrupt
-
ed
,
will
require
only
light
routine
maintenance
*
This
maintenance
should
consist
of
a
general
in
-
spection
and
a
cleaning
of
deposited
dust
and
dirt
particularly
from
insulation
Surfaces
,
and
'
a
few
“
exercising
"
operations
,
.
When
making
these
ex
-
ercising
operations
,
observe
the
mechanical
motions
to
be
sure
they
are
quick
,
snappy
,
and
positive
and
that
there
is
no
tendancy
of
any
parts
to
stick
,
there
.
is
any
'
stickiness
or
sluggish
motion
,
operate
slowly
by
hand
to
locate
the
place
with
high
friction
.
See
paragraphs
on
"
Lubrication
"
,
page
17
.
It
is
recommended
,
that
breakers
which
remain
closed
continuously
without
any
automatic
operations
,
be
tried
for
proper
operation
at
least
once
a
year
.
For
breakers
which
operate
a
moderate
number
of
times
,
say
100
to
1000
per
year
,
mechanical
stickiness
is
unlikely
to
develop
and
there
will
be
BO
need
for
exercising
operations
.
'
However
,
o
:
u
inspections
,
more
attention
should
be
paid
to
clean
-
If
At
ARC
CHUTES
The
insulating
parts
of
the
arc
chute
remain
in
the
circuit
across
the
contacts
at
all
times
.
During
the
time
that
the
contacts
are
open
,
these
insulating
Courtesy of NationalSwitchgear.com

LB
.
32
-
11
)
0
-
3
A
MAINTENANCE
AIR
CIRCUIT
BREAKER
above
.
Particular
attention
should
be
paid
also
to
any
dirt
on
Micarta
surfaces
exposed
to
the
arc
below
the
ceramic
arc
shield
.
Wipe
clean
il
pos
-
sible
.
If
wiping
will
not
remove
dirt
,
rub
with
sand
paper
and
refinish
these
inside
Micarta
surfaces
with
Westinghouso
red
enamel
No
,
672
or
equiv
-
alent
.
On
breakers
which
get
thousands
of
opera
-
tions
at
low
:
and
medium
interrupted
currents
,
lightly
adhering
dirt
may
accumulate
on
the
ceramic
arc
shields
sufficiently
to
impair
proper
interrupting
performance
.
This
tightly
adhering
dirt
can
be
removed
only
by
rubbing
with
coarse
sandpaper
or
other
non
-
conducting
abrasive
paper
.
Doing
this
by
hand
inside
the
arc
chute
is
slow
and
tedious
.
It
is
.
better
to
remove
the
ceramic
arc
shields
from
,
the
arc
chute
and
clean
them
with
a
power
buffer
,
or
sander
.
The
ceramic
arc
shields
may
appear
dirty
and
yet
have
sufficient
.
dielectric
strength
.
The
following
insulation
test
,
may
bo
used
as
a
guide
in
determin
-
ing
when
this
complete
or
major
cleaning
operation
is
required
.
:
4.16
kv
breaker
arc
chutes
should
withstand
IS
fcv
,
60
cycles
for
one
minute
between
front
and
rear
arc
horns
.
7.2
and
13.8
kv
breaker
arc
chutes
should
withstand
28
kv
.
Also
the
dirty
surface
of
the
ceramic
.
near
the
contacts
should
withstand
approximately
10
kv
per
inch
when
test
prods
are
put
directly
onto
the
ceramic
surface
.
When
test
voltage
is
applied
,
there
should
be
no
luminous
'
display
in
the
black
deposits
.
If
,
after
wiping
and
a
light
sanding
in
place
,
the
ceramic
surfaces
will
not
withstand
above
insulation
test
,
they
should
be
removed
and
thoroughly
cleaned
with
a
power
sander
.
While
the
ceramic
arc
shields
or
fire
;
plates
are
out
of
the
arc
chute
,
the
micarta
surfaces
behind
them
should
be
wiped
clean
,
sanded
1
lightly
and
refinished
with
Westing
-
house
No
.
672
enamel
.
After
an
arc
chute
has
been
replaced
,
inspect
it
to
make
certain
that
the
contact
of
the
rear
arcing
horn
has
engaged
the
connector
on
the
blowout
coil
,
that
the
upper
edge
of
the
jacket
is
substan
-
tially
parallel
to
the
magnetic
pole
faces
,
and
that
the
front
arcing
horn
is
securely
connected
to
the
lower
bushing
jby
means
of
the
shunt
strap
.
parts
are
subjected
to
the
full
potential
across
the
breaker
.
Ability
to
withstand
this
potential
depends
upon
the
care
given
the
insulation
.
On
general
inspections
How
out
the
arc
chute
with
dry
compressed
air
by
directing
the
stream
upward
from
the
contact
area
and
out
through
each
of
the
slots
between
;
the
arc
splitter
plates
.
Also
direct
the
dry
air
stream
thoroughly
over
the
arc
box
shields
.
These
are
the
ceramic
liners
in
the
lower
end
of
the
chute
where
the
arc
is
drawn
.
The
arc
chutes
may
be
removed
periodically
for
a
thorough
inspection
.
Remove
any
residue
or
dirt
or
arc
products
with
a
cloth
or
by
a
light
sanding
.
Do
not
Use
a
wire
brush
,
or
emery
cloth
for
tills
pur
-
pose
because
of
the
possibility
of
embedding
con
-
ducting
particles
in
the
ceramic
material
When
inspecting
an
arc
chute
,
look
for
following
:
L
Broken
or
Cracked
Ceramic
Parts
.
Small
pieces
broken
out
of
ceramics
,
or
small
cracks
are
not
important
.
But
large
breaks
and
particularly
cracks
from
the
inverted
V
slot
in
the
interrupter
plates
out
to
the
edge
of
the
plate
or
to
the
top
may
interfere
with
proper
performance
of
the
interrupter
.
Hence
if
more
than
one
or
two
broken
,
or
badly
cracked
plates
are
apparent
,
rene
wal
of
the
ceram
-
ic
stack
is
indicated
.
2
«
Erosion
of
Ceramics
,
,
When
an
arc
strikes
the
ceramic
parts
in
the
arc
chute
,
the
surface
of
the
ceramic
will
be
melted
slightly
.
When
solidified
again
,
the
surface
will
have
a
glazed
whitish
,
ap
-
pearance
*
At
low
and
medium
currents
,
this
effect
.
is
very
slight
.
However
large
current
arcs
repeated
many
times
may
boil
away
appreciable
amounts
of
the
ceramic
.
W
hen
the
width
of
the
slot
at
its
upper
or
narrow
end
(
originally
l
/
Q
has
'
been
eroded
to
twice
its
original
sim
,
(
or
about
\
/
%
inch
)
the
ceramic
stack
assembly
should
be
replaced
.
3
*
Dirt
.
in
-
Arc
Chute
*
In
service
the
arc
chute
assembly
will
become
dirty
from
three
causes
.
First
,
dust
deposited
from
the
air
can
readily
be
blown
out
of
the
chute
with
a
dry
compressed
air
stream
.
Second
,
loose
soot
deposited
,
on
the
inside
surfaces
of
the
arc
chute
in
the
lower
portions
near
the
contacts
may
be
removed
,
by
wiping
with
cloths
free
of
grease
or
metallic
particles
.
Tim
’
d
,
some
deposits
from
the
arc
gasses
will
adhere
vary
tightly
to
the
ceramic
arc
shields
near
the
contacts
.
These
In
normal
operation
the
arc
wilt
make
terminal
marks
all
over
the
arcing
contacts
and
to
a
lesser
extent
on
nearby
metal
parts
.
High
current
arcs
will
erode
arc
contact
material
more
rapidly
,
but
high
,
current
:
arcs
move
upward
very
quickly
off
the
contacts
,
bow
current
arcs
move
very
slowly
and
their
terminals
may
hop
around
the
arcing
contacts
deposits
from
the
metal
vapors
boiled
out
of
the
contacts
and
arc
horn
,
may
accumulate
to
a
harm
-
ful
amount
only
in
breakers
which
get
many
operations
at
low
or
medium
interrupted
currents
.
Cleft
xiixt
^
r
Av
<
c
Shield
#
.
Cleaning
methods
for
the
first
two
types
of
dirt
are
obvious
as
mentioned
15
Courtesy of NationalSwitchgear.com

MAINTENANCE
nia
i
>
m
i
[
<
ttfl
»
iinn
«
Mi
:
»
iwiiiiutimi
»
MiOLCiiii
»
^
(
>
j
.
'
uiMLii
:
ietin
At
usaMtia
r
.
u
for
several
cycles
.
Hence
a
breaker
which
has
had
many
operations
at
low
currents
,
may
be
expected
to
have
numerous
small
burned
spots
and
pock
marks
all
over
the
metal
parts
supporting
the
arcing
When
inspecting
arcing
contacts
the
adjustment
has
been
obtained
remember
to
reset
locking
clips
.
m
©
ABJIC
INSULATION
contacts
.
important
condition
to
be
observed
is
the
extent
of
.
.
the
erosion
of
the
contact
material
.
When
half
of
Organic
insulating
materials
are
used
in
high
voltages
air
circuit
breakers
for
pole
unit
supports
,
operating
rods
,
barriers
,
braces
,
arc
chutes
and
similar
purposes
,
whore
it
has
been
found
to
be
more
suitable
than
porcelain
.
The
material
used
on
Weuilnghouse
breakers
is
M
;
icarta
,
which
lias
a
long
established
record
for
insulating
and
chanical
dependability
.
To
ensure
long
continued
electrical
resistance
,
the
Micarta
surface
is
pro
-
tected
with
high
grade
insulating
varnish
,
which
may
.
be
either
dear
or
pigmented
,
depending
on
the
place
of
use
and
the
apparatus
design
require
-
ments
.
.
The
purpose
of
tire
varnish
is
to
retard
moisture
absorption
and
.
to
provide
an
easily
.
cleaned
sur
-
face
!
.
Like
all
other
.
insulating
surfaces
,
whether
organic
or
inorganic
,
a
varnished
Micarta
surface
should
receive
periodic
attention
in
.
order
to
main
-
tain
the
insulation
resistance
at
the
highest
possible
value
.
the
original
one
eighth
inch
thickness
has
gone
,
the
contact
should
be
replaced
.
This
is
because
the
remaining
rfi
;
inch
thickness
will
be
mechanically
weak
and
might
be
broken
away
suddenly
.
.
'
me
-
On
high
fault
current
operations
there
may
be
.
occassional
slight
burning
on
main
contacts
.
Also
after
many
operations
,
main
contacts
will
sometimes
become
roughened
.
A
fine
flat
file
should
be
used
lightly
on
the
main
contact
silvers
,
removing
only
enough
to
take
off
the
high
spots
.
A
moderate
amount
of
pitting
on
the
main
contact
surfaces
will
riot
appreciably
impair
their
current
-
carrying
ability
because
of
the
high
contact
pressure
.
After
contacts
have
been
worn
and
dressed
,
off
as
above
,
contact
adjustments
should
be
checked
.
See
discussion
on
contact
adjustment
,
page
9
.
Most
re
-
adjusting
will
involve
changing
position
of
nuts
at
lower
end
of
insulating
operating
rod
.
to
lengthen
or
shorten
rod
.
Some
mechanics
may
prefer
to
do
this
adjusting
on
the
operating
rod
with
the
breaker
in
the
closed
position
.
If
this
is
done
,
the
danger
in
this
practice
should
be
understood
and
safety
pre
-
cautions
taken
.
The
energy
stored
!
in
the
con
-
tact
and
opening
'
springs
can
very
easily
lead
to
.
severe
personal
injury
if
breaker
is
de
-
cide
n
tly
trippif
?
d
wh
He
h
e
ad
or
h
an
ds
are
near
the
moving
parts
.
Therefore
,
a
safety
block
or
guard
should
be
put
on
the
breaker
to
stop
*
the
contact
arms
early
in
the
opening
:
stroke
.
On
4.16
kv
breakers
,
adjustment
of
the
center
pole
is
made
in
a
.
slightly
different
manner
.
s
6
me
breakers
a
special
tapped
block
is
jtifled
on
the
lower
side
of
the
cross
bar
instead
of
a
standard
nut
.
Adjustment
is
made
by
removing
the
pin
at
the
upper
end
of
the
operating
rod
,
loosening
the
nut
on
the
upper
side
of
:
the
cross
bar
,
and
then
turning
the
operating
rod
.
Tighten
upper
nut
each
time
adjustment
is
checked
.
When
satisfactory
•
adjustment
is
obtained
,
replace
cotter
pin
at
upper
end
of
operating
rod
.
On
other
breakers
,
a
standard
,
nut
is
used
on
the
lower
end
of
the
-
operating
rod
*
below
the
cross
bar
.
On
these
breakers
close
con
-
tacts
part
way
with
hand
closing
lever
and
,
insert
a
wood
block
under
the
cross
bar
to
hold
it
about
half
way
up
to
the
dosed
position
.
The
locking
clips
can
then
be
readily
opened
and
the
nuts
turned
with
open
end
wrenches
.
After
satisfactory
The
objects
of
maintenance
are
two
-
fold
,
first
‘
to
remove
dust
and
.
other
foreign
air
borne
materials
as
wall
as
chemical
oxides
which
result
from
aging
of
.
the
varnish
.
,
and
second
to
make
sure
that
the
-
varnish
provides
a
.
continuous
protective
film
over
the
entire
insulating
surface
.
>
In
addition
to
the
usually
recommended
periodic
equipment
inspections
,
on
breakers
that
have
been
in
-
service
for
three
to
five
years
,
I
he
insulation
should
be
inspected
,
cleaned
,
and
the
varnish
renewed
if
:
the
surface
indicates
it
to
be
needed
.
©
ItMSfiLUUg
*
While
the
surface
of
the
insulation
is
dry
,
contamination
does
not
usually
cause
any
large
change
in
insulation
value
.
However
,
if
while
.
it
is
present
,
moisture
is
added
in
the
form
of
condensation
,
or
by
more
direct
means
,
the
surface
electrical
leakage
may
be
greatly
increased
,
even
to
the
point
,
of
electrical
breakdown
.
The
first
object
of
maintenance
therefore
is
cleaning
,
clean
varnished
,
surface
will
be
smooth
,
glossy
,
and
free
from
foreign
material
either
loose
or
adhering
to
the
surface
.
To
obtain
a
clean
surface
,
11
:
is
necessary
to
loosen
the
adhesive
dirt
by
scrubbing
and
washing
.
This
is
best
accomplished
in
.
the
'
following
manner
;
In
-
Wash
with
normal
heptane
,
obtainable
from
the
major
oil
companies
such
as
Esso
Standard
.
Use
clean
paper
*
towels
wet
in
the
heptane
.
Use
a
fresh
towel
on
each
pari
.
On
A
Courtesy of NationalSwitchgear.com

LB
.
.
32450
-
3
A
MAINTENANCE
r
»
.
vi
cL
/
.
i
'
.
'
Winrr
<
«
;
.
«
»
vjM
:
ir
.
.
gmArM
\
iir
-
-
»
)
r
.
r
*
!
u
»
iMic
7
x
«
i
.
i
.
rjeMm
;
mirMivi
‘
’
irr
^
aii
<
ir
>
Riwipr
*
..
v
^
wtw
.
>
mMm
«
«
utfdO
»
wr
*
'
w
'
iuiiT
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iKi
iJwriiftwr
»
jL
^
^
AIR
CIRCUIT
BREA
HER
Laminated
Insulation
,
,
Resin
bonded
lami
-
nated
insulating
materials
are
formed
under
pres
-
sure
at
high
temperature
,
The
release
ol
pressure
,
reduction
of
temperature
arid
some
further
shrinking
of
the
resin
bond
produces
internal
stresses
.
Re
-
lieving
of
these
stresses
may
result
in
the
formation
of
minute
cracks
or
checks
along
the
laminated
edges
of
the
.
insulation
.
Such
cracks
,
if
small
,
are
sealed
by
the
varnish
and
are
not
harmful
.
Cawidows
Heptane
is
inflammable
and
no
open
flames
or
sparks
should
be
,
allowed
near
the
work
.
Provide
ample
ventilation
.
Avoid
long
continued
contact
to
skin
by
using
neo
-
prene
gloves
.
Normal
heptane
is
re
commended
,
for
this
use
be
-
cause
,
(
a
)
it
will
not
harm
the
varnish
,
(
b
)
it
will
quickly
vaporize
,
(
c
)
il
:
will
leave
no
residue
which
might
tend
,
to
cause
wetting
action
,
and
fd
)
it
is
.
practically
non
-
toxic
assuming
good
ventilation
.
If
normal
heptane
is
not
available
,
any
substitute
should
meet
all
above
requirements
.
Acceptable
substitutes
are
straight
,
petroleum
distillates
such
as
mixed
heptanes
,
white
or
non
-
leaded
gasoline
without
:
benzol
additives
,
Westinghouse
solvent
No
.
.
16094
,
or
-
2
,
Stoddard
solvent
,
mineral
spirits
,
and
cleaners
'
naptha
.
2
L
After
the
heptane
has
evaporated
,
which
re
-
quires
only
a
minute
or
two
,
wash
.
with
,
do
-
ionized
water
,
sometimes
called
demineralized
water
,
or
distilled
water
.
Note
;
De
-
ionvzed
or
demineralized
water
can
he
obtained
in
small
quantities
.
from
many
firm
s
th
at
n
3
a
in
ta
in
ch
e
m
i
c
al
la
bora
tone
s
,
p
ar
-
ticular
iy
storage
battery
manufacturers
or
electroplater
,
?
,
Use
fresh
paper
towels
and
keep
the
water
in
a
handy
size
glass
bottle
.
Wet
the
towel
from
the
bottle
,
wash
,
the
pari
:
and
dry
immediately
with
a
fresh
towel
.
Use
fresh
towels
.
for
each
part
.
•
lliusgiectioftu
When
inspecting
the
insulating
parts
preparatory
to
cleaning
,
wipe
off
superficial
dirt
with
a
dry
cloth
and
note
the
condition
of
the
varnish
and
of
the
Mi
carta
.
If
the
varnish
appears
in
.
good
condition
,
he
.
,
fairly
smooth
and
with
liberal
coverage
,
proceed
,
with
cleaning
.
If
the
varnish
appears
thin
,
and
is
not
uniform
in
•
coverage
,
is
cracked
,
or
can
be
pooled
olf
with
the
fingernail
,
the
parts
should
be
re
varnished
.
¥
arxiiMiimg
«
Varnishing
can
be
done
with
the
parts
in
position
on
.
the
breaker
,
as
follows
:
In
Sandpaper
when
needed
to
remove
loose
var
-
nish
and
wipe
off
all
dust
from
sanding
.
*
2
H
Apply
three
coats
of
varnish
,
Wes
!
bughouse
Allow
24
hours
drying
time
between
.
coats
at
ordinary
temperatures
*
Drying
time
may
be
decreased
by
preheating
parts
with
infrared
lamps
to
a
temperature
v
of
40
to
SO
degrees
C
before
applying
varnish
and
likewise
healing
each
coat
for
about
4
to
8
hours
,
or
until
the
varnish
has
set
up
to
the
point
where
it
will
not
be
lifted
by
applying
the
succeeding
coat
.
©
PER
ATIN
G
MEGHAN
IS
M
With
average
conditions
,
the
breaker
operating
mechanism
may
be
expected
to
operate
5000
times
or
more
with
only
routine
inspection
and
lubrication
.
During
inspection
the
following
points
should
be
kept
in
mind
.
Remove
loose
dust
and
dirt
with
a
compressed
air
stream
.
Wipe
off
latch
and
roller
surfaces
.
With
hand
closing
lever
,
move
mechanism
parts
slowly
jclosed
to
point
where
arcing
contacts
'
just
touch
,
and
then
allow
contact
arms
to
fall
slowly
to
open
position
,
observing
lor
any
evidence
of
stickiness
or
excessive
friction
.
Holding
trigger
up
,
move
hand
closing
lever
up
and
down
slowly
.
The
core
should
move
freely
in
the
solenoid
and
the
linkage
system
should
reset
positively
when
weight
of
hand
close
lever
is
removed
slowly
.
Lubrication
.
.
If
any
excessive
friction
or
bind
-
ing
is
discovered
on
above
inspection
,
relieve
it
either
by
adding
oil
or
if
.
necessary
by
cleaning
old
dried
lubricant
from
bearing
surfaces
.
In
general
,
the
addition
of
a
few
drops
of
oil
should
be
sufficient
in
most
cases
.
In
a
few
cases
,
after
long
service
,
the
accumulation
of
dried
or
oxidized
lubricant
may
make
it
necessary
to
disassemble
parts
and
clean
them
.
Carbon
tetrachloride
is
a
good
solvent
for
this
.
Apply
a
small
amount
of
a
light
oil
to
the
wearing
surfaces
.
Use
a
stable
oil
with
a
low
rate
of
oxi
-
dation
and
.
with
a
low
pour
point
.
Wemco
C
is
suggested
.
Avoid
putting
oil
on
insulating
material
surfaces
.
Also
put
no
oil
on
the
breaker
contacts
,
nor
on
the
auxiliary
switch
.
Soft
petrolatum
may
be
used
on
the
drawout
connectors
both
primary
and
secondary
.
For
the
puffer
pistons
a
few
drops
of
Wemco
C
is
recommended
.
Place
the
oil
on
cylinder
walls
,
and
spread
around
by
operating
a
few
times
.
For
the
air
bumper
,
which
,
has
a
bronze
piston
and
rings
in
a
brass
cylinder
,
a
small
amount
of
:
graphite
grease
(
W
)
10224
is
recommended
.
In
dusty
,
dirty
locations
,
surplus
oil
may
catch
and
hold
grit
near
,
bearings
and
latches
and
cause
faster
wear
.
In
such
locations
,
it
is
recommended
that
oil
be
omitted
,
and
the
steel
parts
in
the
mechanism
be
lubricated
by
rubbing
with
(
W
)
Mol
-
kolube
powder
(
#
8565
-
3
)
.
M
#
135
-
2
.
Courtesy of NationalSwitchgear.com

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Clearasaccas
.
•
After
a
mechanism
has
operated
several
thousand
times
,
the
following
points
should
be
checked
as
part
of
routine
inspection
,
breaker
open
and
mechanism
reset
there
should
be
%
V
4
,
2
to
clearance
from
tripping
latch
roller
to
cam
.
If
re
-
adjustment
is
necessary
,
see
explanation
under
mechanism
adjustments
.
To
permit
the
closing
latch
to
move
up
to
its
holding
position
the
roller
at
the
lower
end
of
the
non
trip
free
lever
must
overtravel
the
latch
surface
slightly
.
With
breaker
closed
,
look
thru
the
slot
in
panel
with
a
flashlight
at
the
closing
latch
and
roller
,
and
-
energize
the
close
coil
for
one
or
two
seconds
several
times
,
The
overtravel
should
,
be
approximately
mini
-
mum
to
%
%
maximum
.
With
wear
in
the
link
holes
and
pins
,
this
.
over
travel
may
decrease
.
Adjust
men
!
is
made
with
steel
shim
washers
between
the
magnet
back
plate
and
the
four
large
magnetic
return
studs
.
After
about
18
,
000
operations
,
replacement
of
some
parts
'
may
be
required
.
During
j
routine
maintenance
,
the
amount
of
wear
should
be
ob
-
served
on
latch
surfaces
,
rollers
,
pins
Und
pin
holes
.
If
it
becomes
impossible
to
obtain
;
correct
adjustments
or
If
latches
fail
to
hold
,
replacements
should
be
considered
.
Renewal
Parts
-
A
list
of
renewal
parts
recom
-
mended
to
be
kept
in
stock
will
be
furnished
upon
request
.
When
ordering
renewal
parts
,
specify
the
name
of
the
.
part
,
and
include
all
of
the
information
given
on
the
breaker
nameplate
.
With
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MOUSE
ELECTING
COIIP
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IN
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540
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Courtesy of NationalSwitchgear.com