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1MRS 752137-MUM
Combined Overcurrent and Earth-Fault Relay
Operator’s Manual
REJ 525
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 Switchgroup for binary input
SGF Switchgroup for functions
SGR Switchgroup for output contacts
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