Field Controls 46365509 Ballast Assembly UV-18 is an electrical component designed to regulate power supplied to compatible ultraviolet lamps in HVAC air treatment systems. It works by controlling the electrical current delivered to the UV lamp, helping maintain stable operation and consistent ultraviolet output for effective air treatment. Designed for use with compatible Field Contr... https://www.partshnc.com/46365509-field-controls-uv-18-ballast-assembly