EST 519/2 maintains a constant output power supply as long as the input voltage is within the range 140 to 250 V and a load of 22 A can be connected. The need to maintain a stable mains supply, especially for equipment whose performance depends on this value, makes this regulator a valuable auxiliary device when powering mixers, effect devices, etc. An adjustable switch-on delay of 3 or 6 seconds prevents parasitic noise from the mains switch. Includes protection against high input voltage level (255 V), overtemperature, and excess output current (23 A). The output voltage can be adjusted between 1% and 3%.