Parts & Accessories for Automatic Regulating & Controlling Instruments

Parts that are identifiable as suitable solely or principally for thermostats are classified under 9032906120. If a component is genuinely interchangeable across thermostat and non-thermostat automatic controllers without design preference for either, it falls under the NESOI parts line 9032906180. Importers should retain OEM documentation showing the part's primary design application, as CBP may request evidence of principal use when a component is physically identical across product families.

China is a significant supplier of parts under this heading, and many 10-digit lines within 9032.90 have been subject to Section 301 tariffs. The specific rate and any product exclusions depend on the tariff line and the date of entry; exclusions have been granted, modified, and allowed to lapse at various times. Importers sourcing from China should conduct a line-by-line Section 301 review for each part number and monitor USTR exclusion lists, as the landscape changes more frequently than the base HTS schedule.