Low Voltage Power Circuit
Breakers
GEK-7303
TABLE
Main Contacts - Intermediate Contacts
Arcing Contacts
No.
or
Pres-
Wipe
No.
of
Pres-
Wipe No.
of
Pre=r-
Wipe
Breaker ontacts
sure
In In
Contacts
sure
In
ln Contacts
sure
In
Ill
Type
Per
Pole
Lba,
Inches
Per
Pole Lbs,
Inches
Per
Pole
Lb
s,
lnches
-
AK-SO
tor
AC
3 55
to
65
4/64 to
1 55 to
65
.
2 31 to 43
12/64 to
. '1/64
18/64
-
AK-SO
tor
DC
3
55
to
65
1/16 to
'1/64 .
1
55 to
65
'
•
3
31
to
43 12/64 to
18/64
AK-75
tor
AC
5 35 to
45
1/16 to
7/64
1
35 to 45
.
3
31
to
43 12/64 to
18/64
-
"
35
to
45
1/16
to
12/64
to
-
AK-75
tor
DC
5
I 35
to
45
•
5
31
to
43
?/64
18/64
-
.
-
AK-I
00
for
AC
8
25
to
35
1/16 to
2
25
to 35
•
5·
31
to
43
12/64
to
AK
-100
tor
DC
?/64
18/64
_ AKF-2C
3 55 to
65
1/16 to
.
1,
55
to
65
•
2 31
to
43
12/64
to
-
(Oulside Poles
.•.
'1/.
64
.
187?4.
.
AKF-2D (Outside
5 55 to 65:.
1/16 io
I
55
to
65
• ·
3
31
to
43
12/64 to
AKF-2£' (Poles)
·:
'1/64
.
.
18/64
-
AKF•2C (Field
AKF-2D Discbarge
0
-------
-----
Contacta)
0
-----··--
--
2
..
10
io
16
28/64
to
40/64
..
-
• The intermediate conta~t
wipe
should be
at
le~t
1/16
in.
greater
than main·contact wipe.
~
•
Ldt
stationary contact ext;nda approximately 3/32 in.
~
1/32 further than right band contact.
against the stationary arcing contacts at . a point
measured
in
line with the breakbetweenthecontact
stop and the contact pivot block. Push the contact
backward until dimension ."B" ·recorded in item
2
is
reached. The
scale
should then be read.
4.
If
the
pressure
is
not within the
require-
ments
listed
on TABLE
I,
refer
to
the section
of these instructions dealing with
ADJUSTING
CONTACT
WIPE
AND
PRESSURE.
ADJUSTiNG
·coNTACT .
WIPE
AND
PRESSURE
(Fig.
6)
1. To obtain
proper
contact wipe andpressure
on the
center
pole, dimension "A" should be
increased to increase wipe and decreased to
decrease wipe.
· 2. To ch.ange dimension "A" remove the clevis
pin
(14)
and rotate the clevis
as
necessary.
. 3. . To prevent overstressing the clevis threads
(13)
dimension. "
A"
should not exceed 3/16 in. and
space.
'.'A"
should
be
filled with shims to 0.005 in.
of being solid.
·
4.
With the proper
center
pole
WiJ>e
obtained,:.
moving·
the
crossbar
adjusting plate
{lOA)
on the
center pole to the right will simultaneously
in-
cre
a
se
the wipe on both outside. poles; moving
the adjusting plate to the left will have the
reverse
effect.
5.
To
increase
·the wipe on
either
outside pole
individually, move the
crossbar
adjustin~ plate of
that
pole
to
the
left;
to
decrease
the wipe move
the adjusting
plate
to
the
right.
NOTE:
If
the
proper
contact
pressure
does not
exist
when
the
contact
y.,ipe
is
within
its
limits,
the
stationary contacts
springs
should be replaced. ·.
CONTACT
SEQUENCE
(Fig. 6)
On
the
horizontal plane,
the
difference in the
making
of the arcing contacts
on
the same pole must
be
no
greater
than 1/32 in.; the difference
~e~
tween
arcing
contacts on
separate
poles 1/16
m.
If
it
is
desired
to advance
or
retard
the closing
of the main contacts of a pole .loosen the bolts
holding the adjustment plate
(10A)
of
that pole
and
slide
plate
to
the left to advance
con~ct
closing,
or
to
the right to
retard
contact
~los~g
Make
this
adjustment on the
outer
poles, usmg
the
center
pole
as
a reference.
Upon
retight-
ening adjustment plate· bolts,
make.
sure
the lock-
ing
tabs
are
turned
up
a:r:ound
bolt
heads,
locking
the bolts
securely
in
p~ace. . . .
. Contact sequence·
in
the
vertical
plane should
be such·
that
when the. arcing contacts
are
just
touching,
the
intermediate contact gap should be
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