Nicholas, I e-mailed Gralab a few days after I got the timer. Still haven't had a response. No idea how to contact Zone VI -- who handles that brand now?

However, it's good to know what the T is for. Not sure I'd want to put a capacitor across the terminals of an AC device -- how do they quench the arc in a common light switch? Oh, wait -- you mean the capacitor in parallel with the switch, so it conducts for a fraction after the switch opens. Yeah, if I could get the case open I could not only easily check if there's a snubber in there, but solder one in if there isn't. Unfortunately, Gralab though blind rivets would be a nifty way to close the case quickly and cheaply, so I'd have to drill those out to open the timer. Still, I've got a setter for those, and the fasteners are cheapish...

How would one calculate the value for a snubber?