8533 - Electrical resistors (including rheostats and potentiometers), other than heating resistors; parts thereof:
Sub-classifications
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8533 90
Overview
Category 8533 encompasses electrical resistors, excluding those specifically designed for heating applications. This includes a broad range of devices that impede the flow of electrical current, such as fixed resistors (like carbon composition and film types) and variable resistors, which include rheostats and potentiometers. These components are fundamental in electronic circuits for controlling voltage and current levels.
Unlike sibling categories in Chapter 85 which cover other electrical machinery, equipment, and parts, 8533 specifically isolates components whose primary function is electrical resistance. Its scope is distinct from categories like 8534 (Printed circuits) or 8535 (Electrical apparatus for switching or protecting electrical circuits), as it focuses on the resistive element itself rather than circuit boards or protective devices.
Within this category, subcategories differentiate based on the resistor's construction and functionality. Fixed resistors, including specialized composition and film types, are detailed separately. Variable resistors, which allow for adjustable resistance, are further categorized into wirewound types and other forms of rheostats and potentiometers. Finally, a distinct subcategory exists for parts of these resistors, acknowledging that components of resistive devices also fall under this heading.