The MP20 power/relay pack and MSP20 secondary relay pack work with low voltage occupancy sensors to switch lighting loads on and off. The MP20 also transforms 120, 240 and 277 VAC single phase power to Class 2 15 VDC to power remote sensors. Although plenum rated, the elongated mounting nipple allows for these packs to be mounted either directly through a 1/2 in knockout in a junction box or to be located inside an adjacent box for specific local code requirements. Up to 14 sensors may be connected to one MP20. Multi-circuit control can be handled by multiple MP20 or MSP20 packs. MP20s can be wired continuously hot (line side) or on the switch leg (load side) without nuisance delays upon turn on.