Westinghouse De-opn User manual

i
-
S
Electric
Corporation
*
:
•
*
ouse
r
;
i
:
r
-
vt
l
Courtesy of NationalSwitchgear.com

*
:
•
s
-
viy
.
:
?
i
-
"
'
iiV
'
.
¥
Y
;
_
"
-
V
.
!
,
-
.
•
•
r
.
,
.
7
-
7117
'
v
..
/
v
/
/
/
/
V
•
ivv
.
:
7
.•
.
Y
•
-
.•
•
''
-
.
7
J
•
-
•
:
"
•
'
/
:
S
1
-
7
-
'
-
ViV
/
V
-
i
yyyyjffi
;
/
i
-
v
’
-
'
-
r
*
•
•
•
,
.
•
•
•
•
•
.
'
i
i
V
-
•
.
.
!
»
-
L
-
•
••
.•
.
>
•
VS
.
-
/
'
-
:
o
-
v
•
;
;
.
V
if
.
S
*
-
:
i
-
.
/
yyyV
,
:
~
\
*
•
:
:
r
.
•
*
-
•
.
*
?
•
:
'
/
•
-
,
V
'
,
1
*
'
;
V
,
'
.
"
t
•
r
r
-
r
•
'
•
.
.
-
f
-
.
!
v
,
>
v
-
•
r
.
/
•
V
t
•
*
:
v
-
:
-
&
1
V
^
*
v
>
-
:
v
:
;
Y
-
:
..
.
i
.
.
?
'
.
-
'
.
-
-
y
.
/
•
••
L
-
*
:
/
•
I
Y
!
.
;
'
v
J
?
:
,
i
.
.
.
>
:
.
V
1
-
/
.
sPECiAi
monnoES
s
v
:
>
•
'
5
T
-
:
*
.
•
•
•
I
?
.
/
vv
'
:
-
.
-
:
/
•
.
r
.
-
ito
&
K
:
v
“
-
•.
V
•
•
*
.
V
.
"
-
:
/
-
•
>
.
-
T
‘
•
-
‘
r
,
.
.
.
.
...
.
.
VS
•
•
«
.
I
f
*
V
;
v
;
/
*
fv
=
•
-
•
-
•
•
•
'
V
.
,
;
:
v
;
-
.
:
s
*
:
-
?
v
!
'
•
.
:
»
n
:
-
r
-
t
N
-
r
•
-
-
v
.
V
;
,
V
-
/
'
•
vV
;
'
-
’
/
.
*
'
K
$
%
7
-
^
M
>
j
J
\
,
•
.
••
.
.
yT
.
:
'
'
I
-
’’
’
"
l
’
-
*
n
,
•
.
:
‘
•
j
’
*
’
*
!
.
.
-
*
\
.
•
.
’
’
•
.
*
'
/
*
\
*
‘
'
When
communicating
with
Westinghouse
regarding
the
product
covered
by
this
Instruction
Book
,
include
all
data
cbiitained
;
6
n
the
nameplate
attached
to
the
•
equipment
^
.
.
~
-
..
.
.
^
*
.
'
.
.
*
•
‘
.
.
"
.
11
.
*
“
*
*
-
.
.
'
.
.
V
*
"
.
—
.
^
'
,
.
.
.
-
.
..
~
Y
'
\
..
.
*
,
.
!
.
..
.
.
i
,
*
.
..
,
'
•
_
.
.
.
»
.
'
.
.
Also
^
to
facilitate
replied
when
pai
^
qular
informatibii
i
$
d
«
B
-
\
/
gired
^
be
suite
state
^
fully
1
and
^
clearly
the
!
probleto
and
^
y
,
attendant
conditidns
^
T
\
:
Wl
•
•
=
.
;
v
?
n
.
-
'
/
••
,
"
.
*
vv
•
"
-
•
»
;
,
y
,
r
:
Ks
:
:
-
:
:
’
.
••
"
.
.
’
•
•
.
.
.
£
?
»
•
;
5
..
-
v
/
•
/
-
;
•
U
-
:
;
’
s
-
r
r
.
t
.
•
*
.
!
A
%
«
•
*
•
*
.
v
•
•
•
•
-
K
\
\
'
7
.
•
•
•
*
•
r
.
•
'
•
•
:
;
-
>
iV
/
:
-
5
»
.
V
.
.
•
•
•
I
-
»
.
c
:
:
Vi
:
>
.
?
•
:
V
:
.
V
"
•
.
V
;
i
;
.
,
-
r
•
:
•
’
y
.
V
'
V
.
-
v
r
:
-
m
-
=
itt
-
•
•
•
-
V
%
"
-
vr
.
-
V
-
V
’
V
'
-
VvvV
•
•
'
i
>
V
;
v
-
pry
;
V
r
.
-
i
.
’
?
v
-
v
.
r
.
:
-
VVV
/
/
/
:
•
V
?
-
r
f
:
.
-
-
N
.
r
V
»
Addre
^
to
the
nearest
Westingheusb
c
4
;
vvv
:
;
;
V
i
:
»
-
.
V
.
v
'
vi
'
-
.
;
Ilf
i
Vv
-
>
;
i
•
•
»
•
'
-
Vi
-
7
-
/
;
/
.
:
v
-
Av
'
i
-
-
J
.
>
*
representative
as
listed
in
the
back
of
this
book
p
-
'
.
-
y
:
/
-
-
s
-
'
-
y
;
v
,
-
/
,
rV
.
'
/
‘
/
.
/
i
”
i
=
.
V
-
J
%
'
’
*
O
-
f
I
-
•
»
•
•
•
.
-
.
.
-
:
•
•
'
•
•
-
.
’
VV
'
/
rylr
-
y
-
V
.
'
-
J
T
.
•
f
.
-
.
•
•
•
\
Kv
-
i
-
i
,
;
•
>
•
vf
i
'
:
-
6
-
:
y
'
f
'
>
v
:
V
:
?
.
-
•
V
-
i
"
•
:
.
.
Vif
;
i
'
WV
/
V
'
V
.
:
V
,
=
:
•
•
:
>
•
;
V
T
.
3
V
--
VJ
:
j
.
.
.
H
•
I
'
.
;
cvy
.
<
’
•••
A
.
-
*
1
y
.
l
;
*
-
i
s
J
*
;
y
!
>
J
i
-
>
•
-
Vi
.
,
,
;
,
,
.
;
,
'
»
•
Y
'
•
•
/
/
r
..
.
.
.
..
v
%
.
*
•
-
-
1
•
X
‘
I
“
i
.
•
.
•
•
:
,
V
'
:
4
.
VV
.
v
.
1
-
•
:
.
V
-
j
:
r
.
-
;
•
i
,
...
,
4
•
V
^
V
.
<
-
?
'
v
1
•
v
;;
•
V
.
-
:
.
•
;
.
v
.
l
.
'
f
'
-
v
VV
.
Vyi
I
—
.
C
'
V
-
/
"
:
-
:
.
y
4
v
.
:
:
/
y
,
-
i
-
£
•
’
>
:
^
V
fi
.
j
i
V
r
*
-
L
:
'
:
V
;
k
v
_
/
•
:
•
:
-
;
-
V
-
V
-
:
r
YPE
DB
25
«
-
•
AIR
CIRCUIT
BREAKER
Mmmm
i
.
'
i
r
.
:
•
Vs
-
.
\
\
•
'
*
V
?
:
:
V
*
:
•
•
V
.
;
-
i
INT
.
RATING
25000
AMPS
.
FOR
.
CURRENT
RATING
Ut
251
)
D C
OVER
CURRENT
TRIP
N
.
P
;
.
.
>
l
!
..
:
.
ft
i
?
-
.
t
'
vY
..
.
A
*
:
:
;
‘
‘
.
-
y
.
;
Li
!
ay
/
V
'
.
yM
:
:
,
/
XYP
-
Y
!
-
<
.
\
•
•
t
VOI
-
TAGE
600
V
'
A
.
C
:
>
!
,
-
V
“
v
*
—
-
•
,
f
•
>
.
.
<
,
•
.
-
>
.
-
V
-
.
/
/
/
.
J
:
)
>
IS
.
.
/
•
tT
-
:
•
•
•
>
v
*
v
.
'
.
>
:
•
SERIAL
%
•
>
.
/
•
V
'
•
•
V
‘
T
*
>
r
•
:
v
4
.
/
.
i
V
M
,
j
.
•
’
.
.
PATigfa
;
T
:
gy
:
|
jl
^
090
/
^
96
^
43
‘
,
42
LtOl
566
lf
^
:
036284
V
^
Q
3
&
054
v
2
M
74
^
v
216
Q
68
^
-
«
•
.
*
/
I
,
f
:
i
-
:
.
•
:
V
:
•
<
•
^
Y
:
-
..
•
v
-
'
.
J
-
.
*
,
..
k
-
-
.
v
,
»
•
'
'
i
•
J
-
r
V
-
•
.
.
.
i
:
.
V
.
-
•
.
2
•
•
>
•
'
J
:
•
r
-
Vfc
-
V
:
OV
-
V
;
-
.
-
V
‘
.
-
•
:
ii
V
.
>
••
'
A
.
r
.
Ci
:
..
'
•
-
!
.
f
-
4
*
f
*
;
For
a
permanent
record
,
it
is
suggested
that
all
nameplatjb
V
"
.
,
.
Y
-
.
-
/
vV
/
t
i
t
•
s
i
.
"
'
/
'
9
’
•
•
A
'
'
’
•
f
:
VU
5
!
.
>
•
•
r
-
1
i
.
i
•
|
-
-
'
T
i
;
;
k
•
'
•
;
’
i
-
•
;
•
/
*
.
-
.
~
-
j
•
.
K
"
.
i
r
*
'
i
:
vv
"
S
?
J
Vi
IS
4
/
s
/
s
.
,
ifcf
SM
.
i
.
•
.
•
-
J
:
.
£
.
/
.
.
/
/
•
••
:
/
/
.
.
'
i
>
.
.
v
:
;
!
i
:
m
v
1
.
..
Courtesy of NationalSwitchgear.com

r
•
I
.
B
.
S
5
-
225
-
1
A
I
INSTALLATION
•
MAINTENANCE
"
De
-
ion
"
JUR
CIRCUIT
BREAKERS
Types
DB
-
15
and
DB
-
25
j
"
.
•
600
Volts
A
-
C
250
Volts
D
-
C
U
iv
i
:
:
.
interrupting
Rating
Type
DB
-
25
25
/
000
Amperes
Type
DB
-
15
15
/
000
Amperes
7
.
i
'
i
Rating
of
Series
Coils
f
:
«
.
Type
DB
-
25
(
Amperes
)
35
/
50
/
70
/
90
,
100
,
125
150
,
175
,
200
,
225
,
250
,
300
,
350
,
400
,
500
,
600
Type
DB
-
15
(
Amperes
)
15
,
20
,
25
,
35
,
50
,
<
•
v
-
/
125
,
90
,
100
,
70
,
150
,
175
,
200
,
225
;
:
/
!
WESTING
HOUSE
ELECTRIC
CORPORATION
r
r
SWITCHGEAR DIVISION
li
£
EAST
PITTSBURGH
PLANT
SUPERSEDES
I
.
B
.
35
-
225
-
1
EAST
PITTSBURGH
,
PA
.
EFFECTIVE
SEPTEMBER
,
I
960
(
Rep
.
10
-
81
)
•
Printed
in
U
.
S
.
A
.
9
u
'
Courtesy of NationalSwitchgear.com

TABLE
OF
CONTENTS
RECEIVING
,
HANDLING
AND
STORING
Page
7
Part
One
7
Inspection
Storing
.
.
.
7
INSTALLATION
Pages
8
-
12
Part
Two
8
Connections
Enclosures
. .
8
MAINTENANCE
Pages
13
-
28
Part
Three
Pole
Unit
Contacts
Maintenance
of
Contacts
. .
Operating
Mechanism
Closing
Solenoid
.
.
Overcurrent
Tripping
Device
Classification
as
to
Time
-
Current
Characteristics
Operation
Adjustment
of
Calibration
Settings
Installation
and Removal
Maintenance
Control
Relay
.
'
Shunt
Trip
Attachment
Undervoltage
Trip
Attachment
Undervoltage
Time
Delay
Attachment
Reverse
Current
Trip
Attachment
.
,
Field
Discharge
Switch
Auxiliary
Switch
Alarm
Switch
Attachment
Electric
Lockout Attachment
Key
Interlock
Attachment
Terminal
Block
13
13
13
13
i
13
15
15
16
18
18
18
18
19
20
22
22
25
25
26
26
28
28
i
2
Courtesy of NationalSwitchgear.com

f
-
-
V
LB
.
35
-
225
-
1
A
“
m
”
AIR
CIRCUIT
BREAKERS
Z
r
.
V
ILLUSTRATIONS
/
V
LIST
s
’
:
&
-
Page
Figure
1
Type
"
DB
"
Air
Circuit
Breaker
—
Exploded
View
2
DB
-
15
Outline
Dimensions
and
Mounting
Details
3
DB
-
25
Outline
Dimensions
and
Mounting
Details
4
Typical
Wiring
Diagrams
—
Type
"
DB
"
Circuit
Breaker
5
Ventilated
Enclosures
—
Outline
Dimensions
and
Mounting
Details
.
.
6
Cross
-
Sectional
View
of
Type
DB
-
25
Circuit
Breaker
7
Overcurrent
Tripping
Device
-
Location
7
A
Overcurrent
Tripping
Device
—
Construction
Details
8
Tripping
Characteristics
of
DB
-
15
and
DB
-
25
Overcurrent
Tripping
Devices
with
Long
Time
Delay
and
Instantaneous
Elements
8
A
Time
-
Current
Characteristics
of
DB
-
25
Circuit
Breakers
Equipped
with
Typical
Overcurrent
Tripping
Devices
for
Motor
Starting
and
Selective
Operation
...
.
.
.
.
.
.
.
.
9
Control
Relay
—
Location
,
Adjustment
,
and
Construction
Details
—
10
Shunt
Trip
Attachment
—
-
Location
and
Construction
Details
.
11
Undervoltage
Trip
Attachment
—
Location
and
Construction
Details
.
12
Undervoltage
Time
Delay
Attachment
—
Location
12
A
Undervoltage
Time
Delay
Attachment
—
Construction
Details
13
Reverse
Current
Trip
Attachment
—
Location
.
13
A
Reverse
Current
Trip
Attachment
—
Construction
Details
14
Field
Discharge
Switch
—
Location
and
Construction
Details
15
Auxiliary
Switch
—
Location
15
A
Auxiliary
Switch
—
Construction
Details
16
Alarm
Switch
Attachment
—
Location
16
A
Alarm
Switch
Attachment
—
Construction
Details
17
Electric
Lockout
Attachment
—
Location
and
Construction
Details
.
..
18
Key
Interlock
Attachment
—
Location
and
Construction
Details
19
Terminal
Block
Attachment
—
Construction
Details
u
v
.
.
5
>
6
.
9
r
.
10
•
i
-
li
*
*
••
•
12
14
15
*
/
'
•
r
-
-
-
1
15
f t
,
:
-
16
~
Y
&
;
17
19
20
'
iv
K
-
21
22
r
.
:
y
-
22
&
••
•
&
23
iv
-
23
-
*
•
li
24
*
fe
-
25
25
V
.
.
•
26
p
-
'
26
*
T
-
;
27
SV
-
f
-
V
.
I
*
'
-
;
’
28
¥
:
V
28
11
.
r
’
&
v
:
:
r
;
.
T
"
:
/
$
I
ft
•
f
,
;
V
;
£
Be
r
-
sr
&
£
K
Courtesy of NationalSwitchgear.com

«
i
:
•
:
i
I
!
i
l
>
\
!
5
:
:
m
ii
?
:
;
1
m
.
tfs
?
N
:
1
£
,
r
<
i
.
£
i
I
fii
r
I
r
-
4
Courtesy of NationalSwitchgear.com

m
mu
:
\
'
I
.
B
.
35
-
225
-
1
A
“
DB
"
AIR
CIRCUIT
BREAKERS
¥
¥
ft
;
'
p
,
S
#
:
'
.
/
rft
-
ft
’
fg
-
v
m
£
*
1
;
Westinghonse
TYPE
"
DB
"
AIR
CIRCUIT
BREAKER
t
A
•
Type
"
DB
77
aix
circuit
breaker
is
designed
to
give
continuous
and
reliable
service
as
the
protective
link
between
the
power
source
and
associated
pro
-
ductive
equipment
.
This
breaker
is
built
to
operate
with
a
minimum
of
main
-
tenance
,
while
at
the
same
time
its
simplified
construction
permits
maximum
accessibility
for
inspection
and
adjustment
when
required
.
The
ease
with
which
attachments
may
be
added
or
removed
is
an
outstanding
feature
of
the
UDB
"
design
.
For
the
greatest
measure
of
safety
to
operating
personnel
and
also
to
min
-
imize
maintenance
requirements
,
the
breaker
should
be
mounted
in
an
enclosure
suitable
to
local
operating
conditions
.
A
selection
of
standard
enclosures
is
available
for
various
applications
.
H
:
w
V
J
.
•
;
important
:
To
assure
proper
functioning
,
inspect
each
breaker
at
reg
-
ular
intervals
in
accordance
with
a
systematic
maintenance
schedule
.
The
frequency
and
character
of
the
inspections
will
for
the
most
part
be
determined
by
the
severity
of
the
duty
performed
.
The
minimum
requirements
,
however
,
should
consist
of
a
light
monthly
inspection
,
with
a
thorough
inspection
semi
-
annually
.
Occasional
checks
on
cali
-
bration
as
well
as
on
coordination
and
freedom
of
all
moving
parts
,
must
be
included
in
the
maintenance
schedule
.
Consult
Westinghouse
engineering
and
service
personnel
for
recommendations
pertaining
to
special
operating
or
maintenance
conditions
.
f
;
i
t
j
5
Courtesy of NationalSwitchgear.com

'
i
I
.
li
!
!
:
i
?
i
i
<
t
r
;
I
*
!
•
l
:
i
if
i
i
i
I
i
/
i
I
il
if
i
i
ii
?
•
FIG
.
1
.
Type
“
DB
”
Air
Circuit
Breaker
—
Exploded
View
i
u
i
Courtesy of NationalSwitchgear.com

6
|
fr
-
%
:
;
«
•
-
I
.
B
.
35
-
225
-
1
A
“
DB
”
AIR
CIRCUIT
BREAKERS
FART
ONE
x
-
;
\
-
1
.
RECEIVING
,
HANDLING
AND
STORING
&
a
.
Observe
whether
all
parts
are
in
proper
alignment
and
move
freely
.
’
b
»
Make
certain
that
the
studs
have
not
been
forced
out
of
alignment
.
c
«
Be
sure
that
the
contacts
are
clean
and
.
/
properly
aligned
.
For
a
description
of
contact
align
-
ment
,
refer
to
"
Contacts
!
'
,
page
13
.
3
.
If
the
contacts
are
in
alignment
and
all
parts
move
freely
,
continue
the
clockwise
rotation
until
the
breaker
is
latched
,
4
«
Return
the
manual
operating
handle
to
the
neutral
position
,
then
rotate
counterclockwise
to
trip
the
breaker
.
:
a
.
The
toggle
linkage
should
collapse
and
the
moving
contact
assembly
move
freely
to
the
full
open
position
.
This
should
be
followed
immediate
-
ly
by
complete
resetting
of
the
links
in
the
toggle
mechanism
as
the
handle
is
returned
to
the
neutral
position
.
Type
"
DB
"
air
circuit
breakers
,
with
all
attach
-
ments
mounted
in
place
,
are
shipped
in
wooden
crates
or
cardboard
containers
.
Important
:
:
To
avoid
damage
to
the
break
-
ers
,
do
not
use
hooks
in
handling
.
Net
weights
of
Types
DB
-
15
and
DB
-
25
fixed
breakers
are
given
in
Table
No
.
1
below
.
Add
15
lbs
.
for
drawout
breakers
.
f
U
fte
'
•
V
1
Table
No
.
h
NET
WEIGHTS
y
DB
-
15
DB
-
25
TYPE
2
-
Pole
2
-
Polo
3
-
Polo
3
-
Pole
80
lbs
.
100
lbs
.
60
lbs
.
75
lbs
.
70
lbs
.
85
lbs
.
90
lbs
.
110
lbs
.
Manual
Eleatric
Immediately
upon
receipt
,
examine
the
shipment
for
any
loss
or
damage
incurred
during
transit
.
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
.
Remove
tape
from
top
of
arc
chutes
.
hm
The
links
must
always
be
free
to
move
without
friction
or
binding
.
5
.
Check
the
attachments
for
operation
in
accord
-
ance
with
the
appropriate
instructions
as
given
under
"
Maintenance
"
,
Part
Three
of
this
book
„
6
«
All
bearings
and
latch
surfaces
of
the
operat
-
ing
mechanism
should
be
lubricated
approximately
every
*
10
,
000
operations
.
Molybdenum
disulfide
mixed
with
carbon
tetrachloride
(
Wqstinghouse
process
specification
291
401
)
is
recommended
.
The
carbon
tetrachloride
evaporates
,
leaving
a
thin
film
of
molybdenum
disulfide
on
the
bearings
and
pins
.
The
molybdenum
disulfide
is
non
-
greasy
and
consequently
avoids
the
accumulation
of
dust
.
INSPECTION
The
"
DB
"
breaker
assembly
consists
of
a
coor
-
dinated
group
of
sub
-
assemblies
mounted
on
a
steel
supporting
panel
.
(
See
Fig
.
1
)
.
The
complete
break
-
er
assembly
is
to
be
mounted
with
the
steel
panel
in
a
vertical
position
.
All
inspections
for
proper
operation
should
,
therefore
,
be
made
with
the
break
-
er
in
this
position
.
Final
inspection
should
prefer
-
ably
be
made
with
the
breaker
in
its
permanent
mounting
.
Inspect
the
breaker
as
follows
:
1
.
Raise
and
lower
the
trip
bar
by
hand
to
make
sure
that
it
does
not
bind
.
2
.
Rotate
the
manual
operating
handle
slowly
in
a
clockwise
direction
to
move
the
coxitacts
toward
the
closed
position
.
STORING
If
circuit
breakers
are
not
to
be
installed
in
their
permanent
location
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
that
are
apt
to
absorb
moisture
.
7
Courtesy of NationalSwitchgear.com

PART
TWO
I
s
;
i
r
!
ti
!
INSTALLATION
!
:
l
Hi
that
the
mounting
dimensions
differ
and
should
be
obtained
from
the
appropriate
outline
drawing
.
The
following
procedure
applies
to
all
enclosures
:
1
.
Connect
the
entrance
cables
first
.
Whenever
possible
,
the
power
cables
should
be
connected
to
the
top
terminals
to
remove
voltage
from
the
over
-
current
attachments
when
the
breaker
is
open
.
The
cables
can
be
connected
to
the
nearest
terminal
,
or
to
the
opposite
terminal
as
shown
in
Fig
.
5
.
Tin
.
the
ends
of
the
cable
to
prevent
the
formation
of
copper
oxide
.
Tighten
the
clamp
bolt
securely
and
lock
with
the
lock
nut
.
.
.
2
.
Control
wires
should
run
along
the
left
side
of
the
enclosure
below
the
rail
.
Connect
to
the
terminal
block
or
auxiliary
switch
by
running
be
-
tween
the
breaker
platform
and
the
rail
in
front
of
the
wheel
,
after
the
breaker
is
bolted
in
place
.
When
removing
the
breaker
,
disconnect
the
control
wiring
from
the
terminal
block
or
auxiliary
switch
and
lay
in
the
bottom
of
the
enclosure
,
out
of
the
way
of
the
breaker
.
3
.
Roll
the
breaker
into
the
enclosure
until
the
four
mounting
bolts
engage
the
mounting
brackets
.
The
mounting
bolts
are
used
as
jacks
to
pry
the
finger
clusters
into
engagement
with
the
terminals
,
and
consequently
each
bolt
should
be
tightened
*
4
inch
in
succession
until
the
breaker
panel
is
tight
against
the
mounting
brackets
.
The
same
procedure
should
be
followed
in
removing
the
breaker
,
i
.
e
.
,
remove
each
bolt
*
4
Inch
in
succession
until
they
drop
free
,
4
.
Always
rotate
the
operating
handle
to
the
tripped
position
before
removing
the
front
cover
.
A
trip
rod
(
not
shown
in
Fig
.
S
)
holds
the
breaker
trip
free
when
the
front
cover
is
off
,
When
operating
the
breaker
in
the
test
position
(
front
wheels
engag
-
ing
the
slot
in
the
rail
)
,
it
is
unnecessary
to
hold
this
rod
in
manually
to
secure
closure
of
the
breaker
.
When
fastening
the
cover
in
place
,
draw
the
four
cover
bolts
down
firmly
.
Type
"
DB
"
circuit
breakers
are
furnished
as
com
-
plete
unit
assemblies
and
the
installation
consists
of
:
(
1
)
bolting
them
to
the
supporting
framework
or
structure
;
(
2
)
connecting
the
current
-
carrying
cables
or
bus
bars
;
and
(
3
)
completing
any
second
-
ary
control
wiring
that
may
be
necessary
.
Cautions
During
installation
,
the
circuit
breaker
should
be
in
the
open
position
.
Be
sure
to
de
-
energize
the
load
and
control
leads
to
be
connected
,
and
also
the
section
of
the
switchboard
where
the
installation
is
being
made
.
Mounting
dimensions
and
details
of
front
enclo
-
sure
cutouts
are
shown
in
Figs
.
2
and
3
.
To
prevent
distortion
of
the
breaker
panel
,
the
supporting
structure
should
be
checked
for
align
-
ment
.
«
CONNECTIONS
Typical
circuit
breaker
wiring
diagrams
are
shown
in
Fig
.
4
.
The
connecting
cables
or
bus
bars
should
have
adequate
current
-
carrying
capacity
,
otherwise
,
heat
will
be
conducted
to
the
circuit
breaker
resulting
in
possible
excessive
temperature
rise
.
Connecting
cables
or
bus
bars
must
be
sup
-
ported
so
that
the
circuit
breaker
studs
will
not
be
subjected
to
unnecessary
stresses
.
The
circuit
breaker
studs
and
all
connections
should
be
clean
,
smooth
,
and
free
from
burrs
to
assure
full
contact
area
.
They
should
be
firmly
clamped
or
bolted
in
place
to
prevent
excessive
heating
.
ii
ENCLOSURES
The
terminal
panel
and
breaker
arrangement
shown
in
Fig
.
5
apply
specifically
to
ventilated
enclosures
.
The
same
arrangement
is
used
for
all
other
enclosures
(
weatherproof
,
subway
,
explosion
-
proof
,
!
dust
!
tight
and
semi
-
dust
tight
)
except
ii
i
Courtesy of NationalSwitchgear.com

I
.
B
.
3
S
-
22
MA
-
“
DB
”
Am
CIRCUIT
BREAKERS
INSTALLATION
,
4
-
3
9
1
*
3
116
10
4
fg
DIA
,
(
4
)
O
3
>
21
0
*
•
o
3
3
3
TT
2
c
=
r
»
CTD
%
<
L
e
4
8
KR
,
BKR
4
5
15
7
,
f
I
3
MIN
,
HANDLE
CZD
a
IS
16
34
*
8
©
o
o
VIEW
"
B
CUTOUT
IN DEAD
FtiONT
DOOR
OR
COVER
5
I
9
“
r
MIN
.
>
2
8
VIEW
"
A
11
FRONT
VIEW
OF
STUD
LOCATIONS
,
CUTOUT
6
DRILLING
FOR MOUNTING
3
~
P
0
LE
BREAKER WITH
2
OR
3
OVERCURRENT
TRIPS
,
OR
2
~
P
0
LE BREAKER
WITHOUT
REVERSE
CURRENT
TRIP
VIEW
"
CN
FRONT
VIEW
OF
STUD
LOCATION
,
CUTOUT
8
DRILLING
FOR MOUNTING
2
-
POLE
BREAKER WITH
2
OVERCURRENT
TRIPS
8
REVERSE
CURRENT
TRIP
(
FOR
DIMS
.
SEE
VIEW
"
A
"
)
I
LIVE
PARTS
OR
COMBUSTIBLE
MATERIAL
MUST
NOT
BE
LOCATED
IN
THIS
AREA
,
UNLESS
GAS
DEFLECTING
BARRIER
'
S
ARE
PROVIDED
.
%
ft
.
BKR
.
4
3
8
r
©
©
i
i
3
!
3
|
gDIA
.
(
2
)
4
-
L
2
3
8
^
STUD
.
1
Q
5
4
Z
3
8
I
15
y
i
l
%
I
i
!
r
‘
-
17
HANDLE
*
•
;
•
.
•
i
:
*
16
10
t
£
i
I
t
n
E
STUD
H
*
.
8
J
i
8
4
11
©
1
16
3
3
6
3
9
9
-
^
f
|
DlA
.
(
4
)
2
"
7
3
4
4
10
4
/
12
VIEW
V
3
-
POLE
‘
BREAKER
WITHOUT
REVERSE
CURRENT
TRIP
,
OR
2
-
POLE
BREAKER
WITH
OR WITHOUT
REVERSE
CURRENT
TRIP
.
VIEW
"
E
"
BOUNDARY
SURFACES
OF
THE
CIRCUIT
BREAKER ARE
TO
BE
CONSIDERED
GROUND
POTENTIAL
FIG
.
2
,
DB
-
15
Outline
Dimensions
and
Mounting
Details
v
.
9
Courtesy of NationalSwitchgear.com

<
I
-
I
;
;
;
INSTALLATION
,
v
8
<
:
i
:
i
{
Courtesy of NationalSwitchgear.com

JLB
.
S
5
-
225
-
1
A
INSTALLATION
,
“
DB
”
AIR
CIRCUIT
BREAKERS
SHUNT
TRIP
TP
REAR
CONN
.
5836
18
8
PT
.
T
.
I
BLK
.
CS
lllilf
vii
V
'
TERM
.
I
CTO
/
l
t
BLK
.
G
1
o
,
1
r
*
I
l
TOP
I
795
J
34
I
'
-
TN
~
J
<
AUX
.
SW
.
'
"
G
~
G
_
_
nm
'
iT
#
r
I
I
L
BOT
.
AUX
.
SW
.
1
2
SCHEMATIC
WIRING
DIAGRAM
(
FV
.
)
TN
0
^
CO
(
^
\
AI
1
WIRING
-
DIAGRAM
(
FV
.
)
FIXED
PANEL
OPERATION
SEQUENCE
l
.
CONTROL
SW
.
CS
-
C
CLOSED
.
.
Z
"
X
”
RELAY
PICKS
UP
8
SEALS
IN
THRU
AUX
.
CONTACT
"
X
"
:
3
.
CLOSING
COIL
ENERGIZED
THRU
”
X
"
CON
-
TACT
CLOSING
BREAKER
.
4
.
IN
CLOSING
BKR
.
CLOSING
MECH
.
MECHANIC
-
ALLY
TRIPS
“
XM
CONTACTS
FREE
OF
VCOIL
,
INTERRUPTING
CLOSING
CIRCUITS
.
.
5
.
WITH
BKR
.
IN
CLOSED
POSITION
,
THE
BKR
.
CLOSING
MECH
.
IS
LATCHED
UP
AND
MXMCON
-
TACTS
REMAIN
TRIP
FREE
FROM
MXM
COIL
.
6
.
WHEN
BKR
.
IS
TRIPPED
,
CLOSING
MECH
.
DROPS
,
PERMITTING
'
^
"
CONTACTS
TO
RE
-
SET
PROVIDED
HXMCOIL
IS
DEENERGIZED
.
*
REVERSE
CURRENT
P
*
I
)
\
r
-
-
"
2
2
T
V
1
2
a
,
1
z
z
L
:
_
l
-
P
-
"
)
N
*
2 6
i
3 2
'
2
W
-
-
J
\
—
I
RG
)
8
8
A
6
I
L
_
~
-
SCHEMATIC
©
I
WIRING
DIAGRAM
FV
.
)
UNDERVOLTAGE
Hr
4
HH
X
RES
.
0
.
I
6
JI
S
-
I
239
II
5
*
1
s
t
1
l
TP
V
rr
*
n
.
X
1
1
U
-
JT
3
i
'
&
3
4
-
Ici
Q
-
U
\
>
FUSE
*
U
-
-
x
--
i
-
cs
i
1
RJ
iCS
CTO
8
POINT
-
^
-
-
^
TERM
.
BLK
,
p
?
8
^
REAR
CONN
.
4
t
$
X
8
C
8
Y
8
T
OFT
.
BLK
.
^
—
CI
y
X
CA
-
u
—
$
x
T
1
G
4
:
.
T
125
VtD
'
C
250
V
,
D
*
C
120
VvA
-
C
240
V
>
C
480
V
»
A
’
C
T
G
1
X
3
SCHEMATIC
TC
94
CO
I
WIRING
DIAGRAM
(
FV
.
)
1
1
Y
_
1
-
u
2
TN
l
*
*
•
39
^
r
n
4
J
u
SCHEMATIC
ELEC
.
RESET
ALARM
SWITCH
BELL
TP
LEGEND
A
-
ALARM
CONTACT
DOES
NOT
CLOSE
WHEN
BREAKER
IS
TRIPPED
MANUALLY
OR
BY
THE
SHUNT
X
-
CONTROL
RELAY
CC
-
CLOSING
COIL
TC
-
TRIP
COIL
CS
-
CONTROL
SWITCH
R
-
RED
LAMP
(
CLOSED
)
TRIP
G
-
GREEN
LAMP
(
OPEN
)
UV
-
UNDERVOLTAGE
LO
-
LOCKOUT
BA
-
ALARM
SWITCH
a
-
MAKE
CONTACT
b
-
BREAK
CONTACT
T
1
>
-
>
:
)
rsT
?
$
1
iLtlll
1
83634
^
2
ir
=
r
=
t
~
1
I
I
8
X
-
CURRENT
LIMITING
RESISTORS
8
FUSES
TO
BE
USED
ONLY
WHEN
A
-
C
CONTROL
SOURCE
1
$
FROM
SWGR
.
BUS
.
1
/
B
.
A
.
-
T
-
<
H
3
LI
I
TN
j
SCHEMATIC
1
“
TN
WIRING
DIAGRAM
(
FV
.
)
FIG
.
4
.
Typical
Wiring
Diagrams
—
Type
“
DB
”
Circuit
Breaker
11
Courtesy of NationalSwitchgear.com

i
INSTALLATION
i
i
!
I
?
!
!
;
!
'
W
f
;
•
I
I
I
|
j
:
!
\
i
i
I
i
j
i
j
/
i
i
-
i
FIG
.
5
.
Ventilated
Enclosures
—
Outline
Dimensions
and
Mounting
Details
:
*
ii
J
.
i
H
£
M
j
-
'
•
'
%
Courtesy of NationalSwitchgear.com

H
.
B
2
,
35
-
225
-
1
A
<
W
'
AIR
CIRCUIT
BREAKERS
PART
THREE
MAINTENANCE
t
"
:
Maintenance
of
Contacts
,
Rough
or
high
spots
should
b
©
removed
with
a
file
or
sandpaper
.
To
replace
the
arcing
contacts
,
open
the
breaker
,
remove
the
arc
chutes
and then the
stationary
arc
-
ing
contacts
.
Close
the
breaker
and
remove
the
moving
arcing
contacts
.
The
new
contacts
can
then
be added
in
the
reverse
order
.
Cautions
All
power
should
be
removed
when
changing
,
maintaining
or
adjusting
contacts
.
POLE
UNIT
Each
pole
unit
is
mounted
on
a
separate
molded
base
through
which
the
breaker studs
pass
.
(
See
Fig
.
6
)
.
The
molded
bases
are
attached
to
the
steel
mounting
panel
and
provide
insulation
for
the break
-
er
studs
.
The
upper
stud
and
contact
are
attached
to
the
molded
base
by
one
bolt
.
The
moving
contact
is
pivoted
on
the
molded
base
and attached
to
the
cross
bar
through
insulating
links
.
The
series
coil
and lower
stud
are
fastened
to
the
molded
base
by
three
bolts
.
Contacts
.
(
See
Fig
.
6
)
.
The
DB
-
25
arcing
con
-
tacts
should
touch first
on
closing
,
open
last
on
opening
,
and
have
approximately
a
%
2
-
inch
gap
when
the
breaker
is
completely
closed
.
This
gap
is
adjusted
by
removing
the
cross
bar
and
screwing
the
insulating
link
in
or
out
on
the stud
.
Be
sure
to
tighten
the lock
nuts
after
each
adjustment
.
The
DB
-
15
contacts
are
adjusted
to
obtain
*
4
-
inch
horizontal
travel
of
the
cross
bar
after
the
contacts
first
touch
.
As
the
contacts
burn
away
it
will be
necessary
to
adjust
as
described above
for
the
DB
-
25
.
Do
not
over
-
adjust
as
this
will
cause
the
opening
spring
to
compress
to
the
solid
position
and
thus
increase
the
closing
effort
.
Check
for
over
-
adjust
-
ment
by
manually
pulling
the
moving
contact
away
from
the
stationary
contact
,
with
the breaker
in
the
closed
position
.
It
should
be
possible
to
obtain
at
least
Vfo
-
inch
gap
between
contacts
.
v
-
L
.
.
K
-
OPERATING
MECHANISM
'
<
:
-
T
•
The
operating
mechanism
(
see
Fig
.
6
)
is
non
-
ad
justable
and
consists
of
a
series
of
stainless
steel
links
designed
to
secure
low
closing
and
tripping
forces
.
To
check
for
friction
,
raise
til
©
trip
bar
and
slowly
rotate
the
manual
operating
handle
in
close
and
trip
direction
.
The
linkage
should follow
the
handle
without
sticking
.
The
tripping
load
should
not
exceed
14
ounces
measured
at
the
trip
screw
.
CLOSING
SOLENOID
The
closing
solenoid
(
see
Fig
.
6
)
is
non
-
ad
justable
.
It
is
designed
for
intermittent
duty
only
.
Check
for
loose
bolts
.
The
minimum
permissible
control
voltages
at
the
terminal
of
the
closing
coil
,
and
the
closing
currents
at
normal
voltage
are
listed
in
Table
No
.
2
below
.
Table
No
.
2
.
CLOSING
SOLENOID
CONTROL
VOLTAGES
AND
CLOSING
CURRENTS
CLOSING
CURRENT
IN
AMPERES
AT
NOMINAL
VOLTAGE
FOR
3
-
POLE
BREAKERS
MINIMUM
VOLTAGE
AT
COIL
TERMINALS
NOMINAL
VOLTAGE
DB
-
25
DB
-
15
and
DB
-
25
DB
-
15
Close
Trip
Close
Close
Trip
/
18
12
V
,
D
-
C
24
V
,
D
-
C
48
V
,
D
-
C
125
V
,
D
-
C
250
V
,
D
-
C
110
V
,
60
Cy
220
V
,
60
Cy
440
V
,
60
Cy
7
9.5
14
5
28
30
20
2
70
90
10 15
1
180
140
70
1
60
90 90
35
.
5
30
180 180
20
.
2
15
360 360
Eniuium
*
NOTE
:
Tor
A
-
C
closing
use
3
*
kva
source
or
larger
.
•
-
t
13
.
Courtesy of NationalSwitchgear.com

MAINTENANCE
i
11
i
i
:
I
:
‘
;
i
1
!
I
'
.
!
!
i
'
i
;
i
:
•
!
I
i
>
{
:
•
H
;
I
*
.
i
:
:
;
!
I
!
i
I
i
.
.
J
!
i
!
I
ii
l
;
!
!
;
i
!
l
’
*
f
?
'
FIG
.
6
.
Crosa
-
Seetional
View
o
£
Type
DB
25
Circuit
Breaker
;
Courtesy of NationalSwitchgear.com

I
.
B
.
35
-
22
S
-
1
A
MAINTENANCE
“
DB
”
AIR
CIRCUIT
BREAKERS
OVERCURRENT
TRIPPING
DEVICE
amperes
.
Tripping
devices
of
any
of
these
ratings
can
be
applied
to
the
DB
-
25
circuit
breaker
while
The
overcurrent
tripping
devices
of
the
various
tripping
devices
of
ampere
ratings
up
to
a
maximum
ampere
ratings
are
of
the
same
general
construction
of
225
amperes
can
be
applied
to
the
DB
-
15
circuit
(
See
Figs
.
7
and
7
A
)
.
These
tripping
and
size
.
breaker
.
devices
are
made
in
ratings
ranging
from
15
to
600
The
overcurrent
tripping
devices
can
easily
be
removed
from
the
breaker
and
replaced
with
an
-
other
unit
of
different
rating
or
of
the
same
rating
without
danger
of
the
calibrations
changing
.
Classification
as
to
Timo
-
Cwxsrent
Charac
-
teristics
.
The
overcurrent
tripping
devices
have
time
delay
or
instantaneous
elements
or
both
for
the
purpose
of
tripping
the
breaker
in
a
predeter
-
mined
time
when
overloads
or
short
circuits
occur
.
These
tripping
devices
have
trip
elements
of
one
of
the
combinations
listed
below
:
<
L
Standard
Device
.
Long
time
delay
and
instantaneous
elements
as
per
Fig
.
8
with
adjust
-
able
pick
-
up
for
both
elements
.
2
.
Selective
Devices
,
Long
time
delay
and
short
time
delay
elements
with
adjustable
long
time
delay
pick
-
up
.
Curves
B
,
C
and
D
of
Fig
.
8
A
show
typical
curves
of
these
devices
.
The
short
time
delay
pick
-
up
must
be
selected
in
advance
to
meet
the
requirements
of
the
application
.
3
-
Special
Device
.
Adj
ustable
instantane
-
ous
element
only
.
Overcurrent
Tripping
Device
—
Location
It
FIG
.
7
A
.
Overcurrent
Tripping
Device
—
Construction
Details
m
$
15
u
.
&
Courtesy of NationalSwitchgear.com

:
MAINTENANCE
;
a
u
.
I
r
i
.
:
l
i
'
il
r
;
-
ij
!
'
I
f
!
!
i
11
.
FIG
.
8
.
Tripping
Characteristics
of
DB
-
15
and
DB
-
25
Overcurrent
Tripping
Devices
with
Long
Time
Delay
and
Instantaneous
Elements
i
/
Operation
.
The
long
time
delay
is
obtained
by
positive
displacement
of
a
fluid
in
a
hermetically
sealed
tube
through
a
timing
stem
located
in
the
upper
magnetic
core
.
Attraction between
the
upper
and
lower
cores
provides
the
pressure
on
the fluid
which
causes
the
displacement
,
and
raises
the
tub
©
.
The
instantaneous
armature
provides
for
instan
-
taneous
tripping
of
the
breaker
irrespective
of
any
action
within the
sealed
tube
.
On
currents
above
the
prescribed
value
,
the
instantaneous
armature
is
l
4
Courtesy of NationalSwitchgear.com

.
0
.
35
~
225
~
iA
MAINTENANCE
,
*
59
nuMmiBWMiww
*
MMU
“
BB
”
Am
OmCUIT
BREAKERS
?
}
•
• •
-
•
• •
?
&
•
vw
;
-
v
'
-
I
'
•
'
}
'
'
V
?
•
•
:
-
;
v
?
;
-
u
f
I
*
:
.
.
.
.
.
-
..
r
.
*
:
:
.
V
:
•
,
*
Time
-
current
Characteristics
of
DB
-
25
Circuit
Breakers
Equipped
with
Typical
Overcurrent
Tripping
•
/
Devices
for
Motor
Starting
and
Selective
Operation
FIG
.
8
A
.
Otherwise
/
the
construction
and
operation
of
the
tripping
device
embodying
this
delay
is
the
same
as
described
above
for
the
device
with
the
long
time
delay
.
After
the
breaker
has been
tripped
with
time
picked
up
by
flux
inside
of
the lower
core
after
it
has
saturated
and
bodily
raises
the
sealed
tube
which
trips
the breaker
.
The
short
time
delay
is
obtained
by
the
use
of
a
pressure
-
operated
by
-
pass
valve
in
the
timing
stem
.
>
-
17
Courtesy of NationalSwitchgear.com

t
-
MAINTENANCE
delay
,
the
internal
parts
of
the sealed tube
take
from
one
half
to
one
minute
to
reset
.
The
breaker
can
then
be
closed
and
the
tripping
device
will
give
the
required
time
delay
.
If
the
breaker
is
closed
on
load
current
before the
parts
of
the
sealed
tube
are
reset
,
the
breaker
may
trip
out
instantly
.
lower
bolt
is
a
standard
%
-
inch
hexagon
head
steel
bolt
%
inch
long
.
The bolts
for
the
DB
-
25
breaker
are
of
the
same
size
except
the
two
top
bolts
are
2
inches
long
and the lower
bolt
is
1
i
/
g
inches
long
.
Use
one
lock
washer
only
,
under
the
head
of
each
of
these bolts
.
Care
should
be
taken
to
make
sure
that
bolts
longer
than
called
for
above
are
not
used
,
otherwise
,
the
ends
of
the bolts
may
jam
against
the
coil
and
short
circuit
some
of
the
turns
.
f
.
/
The
trip
screw
mounted
on
the
trip
finger
above
the
sealed
tubs
(
see
Fig
.
7
A
)
should
be
adjusted
after
mounting
the
tripping
device
.
First
raise
the
sealed tube
as
far
as
it
will
go
by
pushing
up
on
lever
C
,
then
turn
the
trip
screw
clockwise
until
the
screw
pushes
against
the
tube
sufficient
to
trip
the breaker
.
After
this
,
turn
the
trip
screw
clock
-
wise
one
and
a
half
(
U
/
g
)
turns
and
lock
it
by
means
of
the
locknut
.
This
extra
turn
and
a
half
gives
the
tube
overtravel
and
insures
positive
tripping
at
all
times
.
To
remove
an
overcurrent
tripping
device
from
•
the breaker
,
remove
the
three
bolts
which hold
the
tripping
device
to
the
breaker
base
.
Before
remov
-
ing
the
last
bolt
,
hold
the
tripping
device
to
prevent
it
from
falling
.
Adjustment
of
Calibration
Settings
.
1
,
Long
Time
Delay
Element
.
As
a
safety
measure
,
the
breaker
should
be
disconnected
from
the
circuit
before
making
any
adjustment
.
The
calibration
settings
of
the
long
time
delay
element
are
marked
on
the
nameplate
located
on
the
lower
front of
the
trip
unit
.
The
settings
are
in
amperes
and
are
equivalent
to
80
,
100
,
120
,
140
and
160
percent
of
the coil
rating
.
To
increase
the
calibration
setting
,
turn
the
adjustable
wheel
at
the
lower
end
of
the
nameplate
counterclockwise
,
To
decrease
the
setting
,
turn
the
wheel
clockwise
.
The
long
time
delay
calibration
marker
should
not
be
adjusted
to
less
than
80
percent
setting
or
greater
than
160
percent
setting
,
otherwise
,
incorrect
oper
-
ation
of
the
tripping
device
may
occur
.
2
.
Instantaneous
Trip
Element
.
The
cali
-
bration
setting
in
amperes
for
the
instantaneous
trip
element
is
located
on
the
lower
right
side
of
the
tripping
device
.
Standard
tripping
devices have
a
single
calibration
setting
at
1000
percent
of
the
coil
rating
.
The
calibration
setting
can
be
adjusted
by
lifting
the
support
plate
(
A
,
Fig
.
7
A
)
and
turning
nut
(
B
,
Fig
.
7
A
)
clockwise
to
lower
the
setting
,
and
counterclockwise
to
raise
the
setting
.
The
calibra
-
tion
setting
must
not
be
adjusted
to
less
than
500
percent
setting
or
greater
than
1500
percent
setting
.
The
500
percent
setting
is
approximately
*
4
inch
above
the
1000
percent
setting
and
the
1500
percent
setting
is
approximately
%
2
inch
below
the
1000
percent
setting
.
Maintenance
.
The
sealed tube
(
see
Fig
.
7
A
)
should
move
upward
freely
on
overload
without
un
-
due
friction and
after
it
has
tripped
the
breaker
,
it
should
immediately
drop
until
the
flange
resets
against
the
magnetic
frame
.
To
maintain
,
push
upward
on
the
calibration
lever
(
C
,
Fig
.
7
A
)
as
indicated
by
the
arrow
,
to
raise
the tube
.
The tube
should
go
up
freely
except
for
the
force
exerted
by
the
calibration
springs
and
it
should
drop
when
released
.
If
the
tube does
not
move
freely
,
add
graphite
or
preferably molybdenum
disulfide
to
the
surface
of
the
tube
which
is
ex
-
posed
when
the
tube
is
raised
.
I
CONTROL
RELAY
To
install
an
overcurrent
tripping
device
,
first
make
sure
the
lower end
of
the
flexible
conductor
is
in
the
recessed
pocket
of
the molded base
directly
above
the
lower
breaker stud
.
Then
place
the
trip
unit
so
that
the
top
terminal
of
the
tripping
device
is
over
the flexi
-
ble
conductor
and
the
lower
tripping
device
ter
-
minal
is
over
the
lower
breaker
stud
.
Insert
the
three
bolts
into
the
rear
of
the
base
and
thread them
tightly
into
the
terminals
and
yoke
of
the
tripping
device
.
The
two
top
bolts
for
mounting
the
tripping
device
to
a
DB
-
15
breaker
are
standard
l
/
g
-
inch
hexagon
head steel
bolts
1
*
4
inches
long
and
the
Installation
and Removal
.
The
control
relay
mounts
directly
under
the
aux
-
iliary
switch
(
see
Fig
.
9
)
.
It
is
a
single
-
coil
,
mechan
-
ically
-
tripped
device
with
the
coil suitable
for
continuous
energization
.
The
operation
sequence
is
outlined
in
Fig
.
4
,
page
11
.
The
contacts
should
normally
last the life
of
the
breaker
,
but
are
replace
-
able
if
found
necessary
.
The
relay
release
arm
.
(
see
Fig
.
9
)
should
be
maintained
in
adjustment
to
release
the
relay
con
-
tacts
when
the release
lever
is
approximately
inch
from
its
stop
surface
on
the
relay
mold
,
with
the breaker
closed
.
Courtesy of NationalSwitchgear.com