Containing both a 24VDC supply and a 20A line voltage relay for most models, 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 a 120, 230, 277VAC or 347V ballast load and 20A for a 120VAC incandescent load. 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. The internal relay can control up to 20 Amps at either 120, 230, or 277 VAC ballast load, 15 Amp for 347 VAC ballast load. Power pack for occupancy sensor with HVAC relay 0.5A 125 VAC 1.0A 30VDC, 20 Amp FL/INC, 120-277VAC 60Hz, 1hp @ 120VAC, 2hp @ 240VAC.