photo-coupled; triac controllers; 3 to 32 vdc current limited control input; reverse polarity protected; 24 to 280 v rms operation; zero voltage turn on; 120 vac input voltage; 2.700 in. lg; 1.520 in. w; 1.650 in. h; two 0.190 in. dia mtg holes spaced 2.250 in. c to c