Heater control module includes 12 solid-state relays capable of switching up to 1,200 W each. Individual relays can also control 240 Vac at 5 A in ambient temperatures up to 30°C. Circuits are protected by transient voltage suppressor and metal oxide varistor. Unit measures 10.5 x 5 in. Unpluggable relays, 1.7 x 1 x 0.03 in., interface with programmable logic controller.