SCR Control Panel controls proportionally turn on a percentage of each power line half cycle. This SCR Control Panel gives smooth and infinitely variable application of power to the heaters. Imagine a light dimmer and how it provides power to a light bulb. This method will provide the most precise control of heaters. Phase angle fired SCR Control Panel will respond the fastest load change and provide maximum heater life. SCR Control Panel is the most precise method of control. Phase angle firing can increase heater life up to seven times depending on heater type. Phase angle firing also allows options such as soft start, voltage limit and current limit. These options are not available with any other means of control.