RH Series 25W Wirewound Potentiometers Ohmite RH series wirewound rheostats are designed and manufactured to operate smoothly and reliably over long periods of use. The RH series has a ceramic body with high grade resistance alloy linear taper windings and a vitreous enamel coating. HR rheostats feature a metal spring contact arm, metal graphite composition and solder coated terminals. Features and benefits: ±10% tolerance 25 W Product Applications: Typical applications for the RH series rheostats are motor speed controls, dimmer switches and equipment requiring convenient variable resistance settings.