ABB REX 521 Technical Reference Manual, Standard Configurations page 166

REX 521
External reclosure
initialization signal
Control signal for selecting
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166
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
DC
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1MRS 751802-MUM
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1
Definite trip alarm
Circuit-breaker failure
protection
Blocking signal to the incoming feeder
(START 3I>>)
CLOSE circuit breaker
TRIP circuit breaker