Found this in an attic today. It appeared to be wired to something under the insulation. My thought was perhaps it was used to hardwire the smoke detectors. I know if was live because it was buzzing.
Home built in the 60’s. What do you think this is being used for?
I would bet Robert is right on the money. Kind of a shame, though…a vintage item hidden in the attic. It certainly would not be rated for continuous duty like that, though - not to mention being in a high-heat area. I also wonder where the primary (HV) side is connected.
I used to have a controller similar to that many moons ago when I was a kid.