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Replacement of Contacts
The sub-panel,
removed as a unit by taking out two bolts at the outer ends of the sub-panel.
This gives access to the contacts for easy
The moving arc t
nut on the threaded rod,
shQDt to the main contact,
arc tip may be removed by taking out four flat head screws.
may be replaced in the reverse order.
as shown on drawings
er at one time and then securely lock each adjusting
The
the upper end of the trip unit,
this lower section to the panel,
The contact and shunt can now be removed intact and replaced in the reverse
order.
The stationary
from the rear of the panel on the flat stud,
large contact nut,
type.
lacement is made vrith a complete new upper stud.
The toggle l
so arranged that the
toggles with a reduction at each step,
very lO\i,
but consistent,
This adjust
screw will
the molded
plate,
adjustment
is set slightly
pounds at the tr
justment should not vary in service,
by refer•ence to the sketches.
ance applied
to
the
line with the plunger.
insure prope.r tripping of the breaker by the
calibrated attachments.
Dual
Overload Tripping Attachments
The DK circuit breaker
s of adjustable inverse time delay trip units:-
dual overload,
and
nished in standard rat
either a-c.
or d-e.
for all standard application
time delay that can be adjusted to a minimum,
quired.
The thermal type of time delay,
tions Hhich require unusual
loads,
associated with motor starting
cases any current in
taneous tripping.
Type DK Air Circuit Breaker
barrier and "Do-ion" interrupting assembly may be
can be rewoved by taking out the wire clip and
removing two small screws that hold the secondary
and removing the
4-D
4-D-8316,
and
main contact may be removed by taking out the bolts at
removing two bolts from the rear that hold
and taking out the pin in the contact arm.
main contact can be removed by taking out two bolts
and one bolt from the rear of the panel
in the DK circuit breaker•
breaker load is transmitted through successive
load is maintained
in the front of the
be found
as shown on drawings
over toggle
rod
when the breaker is ful
but can eas
For this operation,
left pole
t.rip finger on the
2
This
p ou
n
d
is supplied
(2)
thermal-magnetic dual overload.
cts listed below,
service.
The oil sucker type of time de
where
overcurrent
long tripping time
excess of ten
times normal
Standard current ratings are:
2
ction or replacement.
arc t
pin.
Take care to make proper adjustment
and set all poles of the break
nut with
or removing the finger cluster,
is a series of links
to the final tripping
with one sirr. p le
4-D-2515
and
to produce
a tripping
closed.
b3 checked or ree.djusted
use a small
trip bar at
tripping loac must b8
overload tr
with either• of two
(l)
oil sucker-magneti'3
Both
and both
s are suitctble for
approaching zero time if' re
on the other hand,
at relatively large over
conditions and
rating produces
The stationary
The new items
wire clip.
on the drawout
' c. oggle 1-1he1:e a
adjustment.
main frame behind
4
16.
'l'hi
load of 2
The facto.ry ad
bal-
in
maintai_ned to
units and other
distinct
s ctre fur
is designed
is
desired with
is for applica
ctions.
In both
instan
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