The OHMITE RNS300E is a wirewound rheostat, a type of variable resistor commonly used in industrial control systems and applications requiring adjustable resistance. These rheostats are known for their durability and ability to handle high power dissipation. The RNS300E series provides a range of resistance values and physical configurations to suit diverse design requirements. They are often employed in motor speed control, lighting dimming, and other applications where precise resistance adjustment is needed. Consult catalog #203 for complete details.