ABB REX 521 Technical Reference Manual, Standard Configurations page 195

1MRS 751802-MUM
TRIP1 to the incoming feeder
Uo>>>,Uo>>
TRIP3 to all outgoing feeders
Uo>>>,Uo>>, U<, U<<, U>, U>> and f<<
TRIP2 to the load shedding group 1
f<
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Protection Relay
Technical Reference Manual, Standard Configurations
Earth-fault alarm Uo>
Internal relay fault
TCS1
TempAlarm
Mains
ACFail
REX 521
195