8533.31.00.00 - For a power handling capacity not exceeding 20 W

This HTS category, 8533.31.00.00, specifically classifies wirewound variable resistors, including rheostats and potentiometers, that are designed for a power handling capacity not exceeding 20 watts. These devices are characterized by their resistive element being formed by winding a resistance wire around an insulating core. Their variable nature allows for adjustment of electrical resistance in a circuit, controlling parameters such as voltage or current. Examples include small control potentiometers used in audio equipment, dimmers, or simple sensor interfaces.

This category is distinguished from its sibling, 8533.39.00, which covers "other" wirewound variable resistors. The primary distinction lies in the power handling capacity. While 8533.31.00.00 is limited to those rated at 20 watts or less, the "other" category encompasses wirewound variable resistors with a power handling capacity exceeding 20 watts. This power rating is a critical factor for classification, reflecting the intended use and physical construction of the device.

As a leaf node, this category has no further subcategories. Therefore, classification within this code depends solely on meeting the criteria of being a wirewound variable resistor (rheostat or potentiometer) with a power handling capacity not exceeding 20 watts. Importers and exporters should verify the specified power rating of the device to ensure correct classification.