Both rheostats and potentiometers are explicitly included in this SITC heading regardless of their end-use function. The classification distinction that matters more at the HTS level is the construction method (wirewound vs. non-wirewound) and, in some cases, the power rating or whether the device is designed for panel mounting. Importers should confirm the corresponding HTS subheading, as power-rated rheostats and precision potentiometers may fall on different 10-digit lines.

Industrial automation and motor control are the largest end-use sectors, where wirewound rheostats handle significant power loads. Precision laboratory instruments, audio and broadcast equipment, and aerospace position sensors also rely on wirewound potentiometers for their stability and low noise. Importers serving these sectors should be prepared to document end-use if any duty-drawback or classification ruling is sought.