Novatek-PEF-301-Phase-Inverter-Automatic-Phase-Selector-Switch-Novatek-PEF-301-P-The-Novatek-PEF-301-universal-automatic-electronic-phase-switch-is-designed-to-supply-a-single-phase-220V-50 Hz-appliance-from-a-three-phase-four-wire-mains-supply-3x-380-N-in-order-to-maintain-an-uninterrupted-power-supply-for-essential-single-phase-equipment-&-protect-it-against-unallowable-voltage-variations-in-the-mains-P-P-To-this-end-a-single-phase-load-is-connected-to-the-three-phase-mains-via-th