Westinghouse DB-75 User Manual

I
.
B
.
33
-
850
-
4
&
5
D
“
DB
”
AIR
CIRCUIT
BREAKERS
PART
ONE
RECEIVING
,
HANDLING
AND
STORING
TYPES
“
DB
-
75
”
AND
“
DB
-
100
”
AIR
CIR
-
CUIT
BREAKERS
are
shipped
in
wooden
crates
with
all
attachments
mounted
in
place
.
Important
:
To
avoid
damage
to
the
break
-
ers
,
do
not
use
hooks
in
handling
.
a
.
Observe
whether
all
parts
are
in
proper
alignment
and
move
freely
.
b
.
Be
sure
that
the
contacts
are
clean
and
properly
aligned
.
The
center
finger
of
the
stationary
arcing
contacts
should
have
a
slight
lead
.
C
.
The
hinge
end
of
the
moving
contact
is
lubricated
with
graphite
grease
and
is
therefore
black
.
For
a
description
of
contact
alignment
refer
to
"
CONTACTS
"
,
Page
14
.
4
.
If
the
contacts
are
in
alignment
and
all
parts
move
freely
,
continue
the
closing
until
the
breaker
is
latched
.
5
.
Hold
the
maintenance
operating
handle
down
.
Push
the
"
Push
to
Trip
"
button
to
trip
breaker
.
a
.
The
toggle
linkage
should
collapse
and
the
moving
contact
assembly
move
freely
to
the
full
open
position
.
This
should
be
followed
by
complete
resetting
of
the
links
in
the
toggle
mechanism
as
the
handle
is
raised
.
b
.
The
links
must
always
be
free
to
move
with
-
out
friction
or
binding
.
6
»
Check
the
attachments
for
operation
in
accord
-
ance
with
the
appropriate
instructions
as
given
under
"
Maintenance
"
,
Part
III
of
this
book
.
Note
:
It
is
not
advisable
to
lubricate
any
parts
o
£
the
breaker
.
The
lubrication
supplied
during
factory
assembly
is
sufficient
for
years
of
service
.
The
lubricant
is
of
a
special
form
which
is
used
sparingly
.
The
addition
of
oil
will
only
promote
the
accumulation
of
dust
and
dirt
.
I
Table
No
.
1
NET
WEIGHTS
OF
3
POLE
BREAKER
DB
-
75
475
lbs
(
Add
50
lbs
for
D
.
O
.
)
DB
-
100
525
lbs
(
Add
75
lbs
for
D
.
O
.
)
DBF
-
40
550
lbs
(
Add
75
lbs
for
D
.
O
.
)
Immediately
upon
receipt
,
examine
shipment
for
any
loss
or
damage
incurred
during
shipment
.
If
injury
or
rough
handling
is
evident
,
file
a
damage
claim
at
once
with
the
transportation
company
and
notify
the
nearest
Westinghouse
Sales
Office
.
When
unpacking
,
be
sure
that
no
loose
parts
are
missing
or
left
in
the
packing
material
.
Report
all
shortages
at
once
.
Blow
out
any
dust
or
particles
of
packing
material
that
may
have
accumulated
on
the
circuit
breaker
parts
.
INSPECTION
The
"
DB
"
breaker
assembly
consists
of
a
co
-
or
-
dinated
group
of
^
ub
-
assemblies
mounted
on
a
sup
-
porting
panel
.
The
^
complete
breaker
assembly
is
to
be
mounted
with
the
panel
in
a
vertical
position
.
All
inspections
for
proper
operation
should
,
therefore
,
be
made
with
the
breaker
in
this
position
.
Final
in
-
spection
should
preferably
be
made
with
the
break
-
er
in
its
permanent
mounting
.
Inspect
the
breaker
as
follows
:
1
.
Lift
trip
finger
by
hand
to
make
sure
that
it
does
not
bind
.
2
.
Remove
any
foreign
particles
from
the
hinge
end
of
the
moving
contacts
.
3
.
Insert
the
maintenance
operating
handle
and
slowly
close
the
breaker
.
STORING
If
circuit
breakers
are
not
to
be
installed
in
their
permanent
locations
at
once
,
they
should
be
care
-
fully
inspected
for
loose
or
damaged
parts
and
then
stored
in
a
clean
,
dry
place
in
an
upright
position
to
avoid
damage
to
the
circuit
breaker
parts
.
A
covering
of
paper
will
prevent
dust
from
settling
on
the
circuit
breaker
parts
and
is
preferred
to
packing
or
other
materials
which
are
apt
to
absorb
moisture
.
FOR
SAFETY
REASONS
,
STORE
THE
BREAKER
IN
THE
OPEN
POSITION
,
7
Courtesy of NationalSwitchgear.com

Westinghouse DB-75 Specifications

General

Brand	Westinghouse
Model	DB-75
Category	Circuit breakers
Language	English