frank1492 writes:
This gets complicated. I used the SS7 (don't know about the C) for
years and had endless trouble with the little motor (relay) inside.

I too was confused about the "C" designation and called
Intermatic. They said it just indicates a different packaging (one
comes in a box and the other in crimped plastic)

When left in an unheated house over the winter (even with the
battery out and the switch disconnected) I would return and find
the "no0p" message when the battery was reinstalled. This happened
repeatedly! The relay failed even with one of the switches installed
in a moderately cold environment but with heat in the house.
I was told at the time by someone in this newsgroup that there
was a known problem with these switches but that IM continued
to market them. IM always sent replacements promptly, but that
was small consolation for the nuisance of having to constantly
replace them!
Apparently you have never seen this.
I really do appreciate your help, but I am done buying these
switches. I thought the EJ500C might be the answer because it
does not appear to use a mecahnical relay, but it obviously has
this inductance problem.
There is a Canadian company that makes a similar switch.
Any experience with that one?
Thanks.
Frank

Are you referring to Aube?
I have recently installed about 6 of their timers. I *really* like the
fact that the switch and timer sit flish to the plate and look just
like a regular Decora paddle (other than the LCD window). My only
(minor) reseravation is that the cover is a bit difficult to open to
change the settings and I am concerned that it might eventually break
off (though to date I have not had any problems). Cost is about $30-35.