1MRS 752179-MUM
Earth-Fault Relay
Operator’s Manual
REJ 521
35
9. Abbreviations
CBFP Circuit-breaker failure protection
CPU Central processing unit
IDMT Inverse definite minimum time characteristic
IRF Internal relay fault
LCD Liquid Crystal Display
LED Light-emitting diode
HMI Human-Machine Interface
SGB Switchgroups for binary input
SGF Switchgroups for functions
SGR Switchgroups for output contacts
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