These are high quality 24V Magnecraft SPST relays rated for 15A at 120VAC or 12A at 240/277VAC.
Dick, Your right – I'm now a Fan Handler Fan! One of the units purchased was for my office, (wanted to try it out here first) and I am pleased with the performance. Am in complete agreement with you -- every HP needs this control (so why aren't I selling more???