A fuseholder presented separately from fuses generally classifies as an electrical connector or accessory rather than as a fuse. When fuses and holders are imported together as a set, classification follows the component that gives the set its essential character — typically the fuse itself — but the specific configuration and packaging matter. Consulting a licensed customs broker is recommended for combination shipments.

Resettable PTC (positive temperature coefficient) devices function as overcurrent protectors but may be classified differently from conventional one-time fuses depending on their construction and the applicable tariff schedule notes. Importers should review the technical description carefully and consider a binding ruling if the device's classification is not clearly established.