Siemens 3UG4617-1CR20, For Three-Phase Supply Voltage Aut. Correction Of Phase Sequ. Phase Failure 3X 160 To 690 V Ac 50 To 60 Hz Under And Ocervolt. 160-690 V Hysteresis 1-20 V Switch-Off Delay 0-20 S 1 W For Power System Fault 1 W For Phase Correction Screw Terminal