The OHMITE REL25R is a wirewound rheostat, a type of variable resistor used to control electrical current. These devices are commonly found in industrial equipment, audio systems, and other applications where adjustable resistance is needed. The REL25R features a robust design and is suitable for demanding environments. Due to their mechanical nature, these rheostats have a finite lifespan and are subject to wear. Refer to catalog #203 for complete details.