ABB REX 521 Technical Reference Manual, Standard Configurations page 180

REX 521
)LJ  &RQQHFWLRQ RYHUYLHZ GLDJUDP RI WKH EXV VHFWLRQDOL]HU
180
Protection Relay
Technical Reference Manual, Standard Configurations
TRIP circuit breaker
CLOSE circuit breaker
Blocking signal to incoming
feeder (START 3I>>)
Circuit-breaker failure
protection
Definite trip alarm
Internal relay fault
Blocking signal
from outgoing
feeders
S1
P1
S2
P2
TCS1
TempAlarm
Mains
ACFail
1MRS 751802-MUM