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DIGITAL MONITORING RELAY FOR THREE-PH. VOLT. W. N COND. AUT. CORRECTION OF PHASE SEQUENCE PHASE FAILURE 3X 160 TO 690V AC 50 TO 60 HZ UNDERVOLT. AND OVERVOLT. 160-690V HYSTERESIS 1-20V OFF DELAY 0-20S 1 W FOR POWER SYSTEM FAULTS 1W FOR PHASE CORRECTI
