The OHMITE RLS7K5E is a wirewound rheostat, a type of variable resistor used for controlling electrical power. These rheostats are designed for demanding industrial environments, offering reliable performance and precise control. They are subject to mechanical wear and have a finite life. Models H, J, G, K, L and N are listed under UL File No. E-10946 and CSA File No. 21309. All rheostats are 10% tolerance.