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

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OPERATION
AM
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ADJUSTMENT
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BREAKER
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>
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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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-
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SOLENOID
COIL
LOWER
TRIP
CLOSING
FREE
LINK
LINKS
CLOSING
LATCH
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BACK
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CLOSING
LATCH
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ir
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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