8533.90.40.00 - For the goods of subheading 8533.40, of ceramic or metallic materials, electrically or mechanically reactive to changes in temperature 🖩

This HTS classification, 8533.90.40.00, specifically covers parts of electrically or mechanically reactive electrical resistors (excluding heating resistors) when those parts are manufactured from ceramic or metallic materials. The defining characteristic of this category is the material composition and the functional property of reacting to changes in temperature, which influences their electrical or mechanical resistance. These components are integral to the operation of various types of resistors, such as thermistors, which are designed to exhibit a significant change in resistance with variations in temperature.

While the broader category of "Parts" for resistors (8533.90) encompasses a range of components, this specific subheading is distinct from its sibling, 8533.90.80.00 ("Other"). The "Other" category would include parts for resistors that do not meet the specific criteria of being made of ceramic or metallic materials and being reactive to temperature changes. Therefore, classification under 8533.90.40.00 requires a direct correlation between the material of the part, its intended function within a resistor, and its temperature-sensitive properties.

As this is a leaf node in the HTS structure, there are no further subcategories under 8533.90.40.00. Classification concludes at this level, focusing on the precise identification of these temperature-reactive, ceramic or metallic resistor parts. Examples of goods classified here might include the ceramic substrates or metallic elements that form the active sensing component within a thermistor or a similar temperature-sensitive resistive device.