The OHMITE RHS20K is a wirewound rheostat, a type of variable resistor used for controlling electrical power. These rheostats are designed for industrial applications requiring precise and reliable control. They feature robust construction and are suitable for a wide range of electrical systems. Models H, J, G, K, L are available in enclosed versions. Dimensions are for reference only; consult the factory for detailed specifications. Since these are electro-mechanical devices, they are subject to mechanical wear and have a finite lifespan.