*Updated 2021* The ControlKeeper 4A network lighting control panel is a cost effective specification grade lighting control system packed with plenty of standard features. Control up to 4 relays per panel with optional support for up to 4 0-10V dimming ballast control outputs. Network up to 254 ControlKeeper panels for a state of the art lighting control system.UL listed – UL916 standardNEMA 1 enclosureSupport for up to four 0-10V dimming ballast outputsCapable of mixed load voltages (120/277 VAC) as well as mixed sources (ie. normal and emergency power)4 single pole or 2 two pole serial relaysElectrically held normally open, mechanically latched, and two pole relays availableOpen or closed loop control algorithms Time schedules with astronomic clock_x000D_