Is it the HD-243 15 Amp 220 Volt or the HD245 20 Amp 220 Volt ones that others have said where freebies?
If not what is the model on it, as I kind of remember X10 had a 20 Amp 120 Volt module at one time.
I bought a few from a dealer [EBay not expensive at all] and they where so old they where actually "X10 HD-243" by BSR
Yes BSR the original manufacturer of the products.
Date Code on mine is 2J41 and I don't think the 2 is 2002 maybe 1992 or even 1982. After I took one out of the adapter case to see the wall outlet inside. It was marked Leviton. Yes there is a single wall outlet inside the case that makes it a plug in device. Too bad to fit the case they cut off the mounting ears.
Back to the question. I have not seen the NEMA 6-20R Receptacles used in homes in a long time. I still see them in industrial settings and have some at work for machines we manufacture.
I did buy a single NEMA 6-20R outlet at my local hardware store just to play with my new module and
to disassemble it to see how it works. The NEMA 6-20R has slots that mate with both the 15 and 20 amp modules. I believe the 15 has two horizontal tabs and the 20 has one horizontal and one vertical.
Maybe that is why they are freebies.