Power switch packs provide 24 V power supply to operate Lutron sensors as well as the 20 A line voltage relay to control the load in one compact housing. The unit can be placed outside or inside the junction box with a simple twist-on nut. The auxiliary relay model can be used with line voltage power packs to switch additional loads. High-impact UL94 5 VA flammability-rated plastic case construction. For indoor use only.