connect a triac to optoisolator
That LDA110 doesn't appear very well suited to driving a Triac. We typically use triac opto isolators like MOC3022 for driving Triacs.

Ref: http://www.allelectronics.com/make-a-store/item/moc3022/opto-isolator-triac-output/1.html

You will need some kind of amplifier and comparator setpoint circuit between your current sensor and the opto-isolator.