8533.21.00.80 - Wirewound

This HTS category, 8533.21.00.80, specifically classifies wirewound fixed electrical resistors designed for a power handling capacity not exceeding 20 watts. Wirewound resistors are constructed by winding a resistive wire, typically made of alloys like nichrome or stainless steel, around a core, which can be ceramic, glass, or a phenolic resin. The primary function of these resistors is to limit current flow or create voltage drops in electrical circuits.

Within the broader category of "Other fixed resistors" for a power handling capacity not exceeding 20W, this subcategory is distinguished by its construction method. Its sibling category, 8533.21.00.90, covers "Other" fixed resistors in the same power range, which would encompass resistors constructed from different materials or employing different manufacturing techniques, such as metal film, metal oxide, or thick cement film technologies, where resistive elements are not formed by winding wire.

As this is a leaf node, there are no further subcategories. Therefore, classification within 8533.21.00.80 hinges on the confirmed wirewound construction and the specified power rating. Examples falling under this code include small, low-power wirewound resistors used in consumer electronics, control systems, and instrumentation where precise resistance values and modest power dissipation are required. The key differentiator remains the physical construction as a wound resistive element.