The Siemens 6GA2491-1A is a robust and reliable automatic voltage regulator (AVR) designed for the precise control of synchronous generators. This analogue excitation unit ensures a stable and constant output voltage, even under fluctuating load conditions. It is suitable for both single and parallel generator operations, providing essential protection features like under-frequency roll-off (U/f characteristic) to safeguard the generator set. Its compact design and proven Siemens reliability make it an ideal choice for a wide range of power generation applications, ensuring optimal performance and longevity of your equipment.