The Schneider Electric 8430DASV is a DPDT phase failure relay that monitors three-phase power at 415 V and 60 Hz. Its two double-pole double-throw contacts open when a phase is lost, providing a control signal to shut down motors or other equipment and prevent damage from single-phasing. Square D 8430DASV units are wired into industrial control panels and motor circuits where reliable phase-loss detection is required.
