The OHMITE RES125E is a wirewound rheostat, a type of variable resistor used in a wide range of industrial and electronic applications. These rheostats are characterized by their robust construction, high power handling capabilities, and precise resistance adjustment. They are commonly used in motor speed control, lighting dimming, and audio volume control systems. The RES125E series offers various models with different wattage ratings, core types (open or enclosed), and shaft rotation options to meet specific application requirements. Consult catalog #203 for complete details and specifications.