Download the application note from MicroChip for a dimmer using the 12C508
http://www.microchip.com/Download/appnote/category/rdesigns/40171a.pdf
Strip off everything but the triac part, and use that to drive a 120V AC
relay.
You don`t need the zero crossing  just a high or low to the triac drive.

Works I've used it.

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