I was also just looking into the Intermatic IG1240RC here:
http://www.electricsupplyonline.com/...-arrestors.php
Reading the instructions, it does say that it requires two dedicated 15 amp breakers. I happen to have 2 slots empty, so unless I'm mistaken, I'll need to find two matching breakers.
Do we need two dedicated breakers Ozz?
Install instructions:
http://www.intermatic.com/images/ins...s/IG1240RC.pdf