Containing both a 24 VDC supply and a 20 A line voltage relay for most models of occupancy sensors, the Leviton compact power pack provides low-voltage power and line voltage control for Leviton occupancy sensors. Versions include auto-on and manual ON inputs for occupancy sensors, hold-on and hold-off capabilities and a lOcal® input for momentary or maintained dry contact switches. The internal relay can control up to 20A for 120, 230, 277VAC or 347VAC ballast loads and 120VAC incandescent loads. The OSP power pack series is also used to supply power to the OSA add-a-relay model. The power pack conveniently mounts in a knockout hole of a standard junction box. The unit can be placed inside or outside the junction box with a simple twist-on nut.