3-phase mains monitoring for series installation 400 V AC 50/60 Hz, for DIN rail, 2 changeover contacts for 8 A (AC1), contact material AgNi, contact voltage 250 V AC, max. contact voltage 400 V AC, contact material: AgCdO, industrial design: 22.5 mm wide, phase sequence and phase failure monitoring even with reverse voltage, supply voltage operating range 170 - 520 V, LED status display