Assembly consists of engineered phase controller, solid-state relay, and heat sink appropriately sized for application. It allows for 50-60 Hz operation and suits switching of inductive loads. Controller accepts 0-135 ohms, 4-20 mA, 0-5 Vdc, 0-10 Vdc, and potentiometer control, as well as PWM inputs. Load currents range from 0.04-100 Aac, with load available up to 660 Vac. Line voltage compensation, soft-start, adjustable voltage limiting, and LED status indication come standard.