ITE K-3000 - Contact Pressure Adjustments; Jaw Type Arcing Contacts Adjustment; Butt Type Arcing Contacts Adjustment; Manual Slow Close for Contact Pressure Check

IB
-
9.1
.
7
-
4
LOW
-
VOLTAGE
POWER
CIRCUIT
BREAKERS
PAGE
11
f
CONTACT
PRESSURE
CHECK
AND
ADJUSTMENT
f
.
To
remove
the
spring
retainer
bracket
(
1 1
)
,
push
the
manual
trip
button
(
8
)
to
trip
the
circuit
breaker
.
Continue
pumping
until
closing
springs
are
again
heard
to
snap
.
Then
remove
spring
retainer
bracket
.
g
.
The
circuit
breaker
is
now
charged
and
read
/
In
be
closed
.
h
.
To
discharge
closing
springs
,
pull
the
manual
close
lever
(
6
)
and
push
manual
trip
button
(
8
)
.
i
.
Put
arc
chutes
(
1
)
back
on
.
Jaw
Type
Arcing
Contacts
(
See
Figure
3
A
)
FOR
SAFETY
:
Keep
clear
of
breaker
parts
during
this
operation
.
a
.
Close
the
breaker
.
Lever
(
15
,
Figure
]
)
must
be
in
the
up
position
.
b
.
For
each
set
of
eight
contacts
on
one
pole
,
the
smallest
gap
“
A
"
should
be
.
100
-
.
105
inch
.
If
adjust
-
ment
is
required
,
loosen
lock
screw
(
2
)
.
Turn
adjust
-
ment
screw
(
1
}
until
.
100
-
.
105
is
obtained
an
the
'
inaliest
gap
of
the
eight
contacts
.
Repeat
this
for
the
}
;
i
-
1
•
/
U
Lighten
lark
screw
{
/
1
;
»
n
>
,
i
.
t
’
.
-
I
>
Nl
:
•
hi
For
Earlier
Model
Circuit
Breakers
Furnished
with
Butt
Type
Arcing
Contacts
(
See
Figure
3
)
FOR
SAFETY
:
Keep
clear
of
breaker
parts
during
this
operation
.
a
.
Close
the
breaker
.
Lever
(
1
5
,
Figure
1
)
must
be
m
the
up
position
.
*
-
r
'
i
.
i
i
£
i
i
i
!
-
t
.
.
'
f
.
-
M
Mil
ii
i
;
i
4
r
C
•
f
>
i
i
\
t
b
.
For
each
set
of
eight
contacts
on
one
pole
,
the
“
A
"
should
be
090
OV
'
»
IIK
h
If
adjust
-
nuilh
"
,
t
grip
munt
is
requited
,
loosen
lock
s t r e w
(
7
)
lum
adjust
ment
screw
(
I
)
unlil
.
090
-
.
095
is
obtained
on
the
smallest
gap
of
the
eight
contacts
.
Repeal
this
lor
the
other
two
poles
.
MOV
I
N
<
i
MAIN
1
ONI
Ai
T
>
c
.
Slow
close
the
breaker
(
see
'
Manual
Slow
Close
to
Check
Contact
Pressure
*
’
below
)
until
the
first
arcing
contact
of
the
three
poles
just
touches
and
hold
in
this
position
.
Adjust
the
other
two
poles
,
screw
(
I
)
,
unlil
the
leading
arcing
contorts
of
each
pole
make
simul
-
taneously
within
1
/
3 2
inch
.
f
ujll
}
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•
11
|
Of
k
-
»
«
IfW
{
/
i
(
Fig
.
3
A
—
Contact
Pressure
Check
and
Adjustment
Ml
1
i
’
JN
!
*
-
MANUAL
SLOW
CLOSE
TO
CHECK
CONTACT
PRESSURE
(
See
Figures
i
,
3
and
4
)
a
.
Remove
arc
chutes
(
1
)
.
b
.
If
the
circuit
breaker
closing
springs
are
dis
-
charged
as
seen
by
the
spring
charged
indicator
(
1 4
)
,
engage
the
manual
charge
handle
(
1 2
)
with
the
charg
-
ing
lever
(
7
)
.
Pump
charging
lever
until
the
circuit
breaker
closing
springs
are
heard
to
snap
into
the
charged
position
.
c
.
Remove
screw
(
1 9
)
,
shift
the
shutter
(
4
)
to
the
left
and
insert
the
spring
retainer
bracket
(
I I
)
so
that
its
tips
fit
into
the
closing
springs
and
its
flanges
fit
into
the
holes
in
the
closing
spring
guides
.
NOTE
:
On
drawout
breakers
,
shutter
(
4
)
cannot
be
opened
unless
breaker
drawout
mechanism
is
in
the
“
DISCONNECT
*
*
,
"
TEST
”
or
“
CONNECTED
”
position
.
The
drawout
lever
(
1 5
)
cannot
be
operated
when
shut
-
ter
(
4
)
is
open
.
d
.
Use
a
stick
to
hold
the
spring
retainer
bracket
(
1 1
)
toward
the
front
of
the
breaker
and
in
place
while
pulling
the
manual
close
lever
(
6
)
to
discharge
the
closing
springs
.
(
This
will
partially
close
contacts
.
)
e
.
Insert
the
manual
charge
handle
(
1 2
)
into
the
charging
lever
socket
and
pump
to
slow
close
the
circuit
breaker
to
the
required
amount
.
\
i
H
f
'
\
h
;
'
L
11
•
'
MAIN
SL
KANAdLT
CONT ACT
AS
$
£
MB
(
t
-
i
:
f
MAIN
CONTACT
.
AC
*
Fig
.
3
—
Contact
Pressure
Check
and
Adjustment
df
rtf
?
*
3
-
:
i
«
£
R
iPR
'
Nli
RETAINER
BRACKET
(
Fig
.
4
—
Shutter
Detail
Courtesy of NationalSwitchgear.com