Classified under the residual "not elsewhere specified" provision, this heading captures low-voltage switching and circuit-protection devices—such as relays, contactors, and surge protectors—that don't fall into more specific SITC categories. The sub-1,000 V voltage ceiling is the critical classification boundary: apparatus rated above that threshold moves to a different heading entirely. Importers should note that many products in this space originate from countries subject to Section 301 tariffs, making country-of-origin documentation a routine compliance focus. Correct classification often hinges on whether the device's primary function is switching, protecting, or merely connecting circuits.

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