The OHMITE RNS900E is a wirewound rheostat, a type of variable resistor commonly used in industrial control systems, laboratory equipment, and audio applications. These rheostats provide precise resistance adjustment and are known for their durability and ability to handle high power dissipation. The RNS900E series offers a range of models with different wattage ratings, resistance ranges, and shaft configurations to meet diverse application requirements. Consult catalog #203 for complete details.