120
WOLTS, 60 CYCLES
1�
�OLTS
60 CYCLES
W�EN TESTIM�
CASE
R ES lSTAIICE
LOAD
AUX .
c . T .
CA-6 RELAY
( FRONT
V IEW)
NOTE
1;
A COMMON 2 �
V ,
60 CYCLE
SOURCE CAN BE USED TO
SUPPLY 80TII OPERAT I NG
AND RESTRA I N T C I RCU I TS
NOTE
2:
W�EN SEPARATE SOURCES
ARE USED , T�E �OLTAGES
SMOijLO if
ESSEN T I A LLY
I N PHASE.
l 83A228
*
Fig.
JO.
Diagram of Test Connections for the type CA-6 R elay,
capacity bus, it is difficult to keep the m aximum in
ternal fault currents down to a 100 ampere value.
Thus , the instantaneous unit assures prompt tripping
at excessively high current value s.
At the same
time , the instantaneous unit should not have a set
ting substantially lower than 100 amperes ( second
ary) in order to avoid a pos sible false operation for
external faults. The stronger spiral control spring
is provided in order that the relay maybe given a
higher minimum trip s etting , as noted under "Ad
justment s and Maint enance " .
TRIP CIRCU IT
The main contact� will safely close 30 amperes
at 250 volts d-e and the seal-in contacts of the indi
cating contactor switch will safely c arry this current
long enough to trip a circuit breaker.
The indicating instantaneous trip contacts will
safely close 30 amperes at 250 volts d-e, and will
carry this current long enough
to
trip a breaker.
The indicating contactor switch has two tap s
that provide a pickup setting o f 0 . 2 o r 2 amperes.
*
To change taps requires connecting the lead located
in front of the tap block to the desired setting by
means of a screw connectiono
TRIP CIRCUIT CONSTANT
Indicating Contactor Switch (ICS)
0 . 2 ampere tap
6 . 5
ohms d-e resistance
2 . 0 ampere tap 0. 15 ohms d-e resistance
EHE RGY REQU I R EME HTS
Burden of each Restraint Coil at 5 amps.
VOLT AMPERES
. 75
POWER FACTOR
. 7
Continuous Rating
1 0 Amperes
1 Second Rating
250 Amperes
Burden of Op erating Circuit
VOLT AMPERES
Variable See Fig. 5
Continuous Rating
1 Second Rating
5 Amperes
150 Amperes
9
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