PILZ S1PN 550-690VAC 2c/o – 890220 | JUAL PILZ S1PN 550-690VAC 2c/o – 890220 – Phase sequence monitoring relay, to detect the phase sequence, the phase failure, the asymmetry of a three-phase supply, measuring voltage= supply voltage, 2 C/O contacts, width 22.5 mm, UB = 550 – 690 V AC.