Alternating current phase sequence-phase error relay without auxiliary voltage Detection of incorrect phase sequence, Detection of phase-voltage asymmetry, Phase failure detection, also for reverse polarity voltage with and without phase offset, Adjustable alternating current Nominal voltage 3 AC 380 V, 400 V, 415 V with associated low voltage recognition, of one, two and all three phases, Standby current principle, reaction time 35 ms at each fault recognition, Contact allocation: SPW 1004 2 changer, SPW 1005 1 changer