wvmarle:
This shouldn't be an issue with an AC load, thanks to the current dropping to zero 100 times a second (or 120 times if you're on 60 Hz).
Usually true.. IF the relay is rated for motor type load (usually expressed in Horsepower and well as current.) Relay contacts designed for AC motor loads can have special properties. The voltage and current of a motor load do not go to zero at the same time, though, and when the contacts break there still may be energy that needs to go somewhere.