The OPB15 power base is a unique, patent pending, 15 A power pack for low voltage occupancy sensors packaged in a housing that forms the mounting base of these products. This allows for installations where only line voltage circuitry is available while providing the full line of Leviton low voltage ceiling sensors to meet every application. The OPB15 power base provides all of the same features as the standard OSP power pack series with a full rated 15 amp, zero cross relay with 24 VDC supply. The power base adapter converts any Leviton low voltage ceiling occupancy sensor to a self-contained, line voltage unit, with 15 A, 120/277 VAC load capacity.