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41-241.3L
Figure 1. Time-Power Unit. 2. Indicating Contactor Switch (ICS). Note: Phase shifting resistor is mounted in rear.
2.3
Indicating Contactor Switch Unit (ICS)
The dc indicating contactor switch is a small clapper
type device. A magnetic armature, to which leaf-
spring mounted contacts are attached, is attracted to
the magnetic core upon energization of the switch.
When the switch closes, the moving contacts bridge
two stationary contact, completing the trip circuit.
Also during this operation two fingers on the arma-
ture deflect a spring located on the front of the
switch, which allows the operation indicator target to
drop. The target is reset from the outside of the case
by a push rod located at the bottom of the cover.
The front spring, in addition to holding the target, pro-
vides restraint for the armature and thus controls the
pickup value of the switch.
3.0
CHARACTERISTICS
Type CW relays are available in the following ranges
and taps:
2
Volts
Line-to
Line
Range
120
20-120
20-
100-600 100- 150- 200- 300- 400- 500- 600
208
35-200
35-
175-1000 175- 250- 350- 500- 700- 875- 1000
Typical 60 hertz Time-Power Curves are shown in
Figures 5 and 6. The curves are taken at maximum
torque which occurs with the current leading the volt-
age by 30 degrees. (within ± 4 ° ) The time curves
apply ± 5% at rated voltage.
3.1
Trip Circuit
The main contacts will safely close 30 Amperes at
250 volts dc and the seal-in contacts of the indicating
contactor switch will safely carry this current long
enough to trip a circuit breaker.
( I
V
)
L
LL
( 3 single phase watts )
Taps
30-
40- 60-
80-
100- 120
50-
70- 100- 140- 175- 200
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