The OHMITE RKS3R0 is a wirewound rheostat, a type of variable resistor used for controlling electrical power. These devices are commonly found in industrial equipment, audio systems, and other applications requiring adjustable resistance. The RKS3R0 is designed for durability and precision, offering reliable performance in demanding environments. Consult catalog #203 for complete specifications and application details. Due to their electro-mechanical nature, these rheostats have a finite lifespan.