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HSChapter 85
U.S. imports of wirewound variable resistors (rheostats & potentiometers), power capacity exceeding 20 w (HS 853339) totaled $1.2M in July 2026, traded with 27 countries.
Importers of Wirewound Variable Resistors (Rheostats & Potentiometers), Power Capacity Exceeding 20 W paid $188K in duties in July 2026 — an effective duty rate of 20% on $924K in dutiable value, based on actual customs collections rather than the published tariff schedule. Wirewound Variable Resistors (Rheostats & Potentiometers), Power Capacity Exceeding 20 W imports of $1.2M in July 2026 ran 19% above the year-to-date monthly average of $990K.
Last updated: July 2026 dataHeavy-duty wirewound rheostats and potentiometers rated above 20 watts handle significant power loads in motor starters, industrial heating controls, and high-current test equipment. The US schedule splits this heading into dimmers (8533390040) — a commercially important subset used in lighting control systems — and all other wirewound variable resistors exceeding 20 W (8533390080). China and Vietnam are the leading sources of US imports under this heading, with Germany supplying higher-specification industrial types.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
119 shipments/mo
Lighting dimmers (8533390040) are singled out because they represent a distinct, high-volume commercial product category with different end-use markets and, in some trade-remedy contexts, different enforcement histories than general-purpose rheostats. The separation allows CBP and trade statisticians to track dimmer imports independently from industrial high-power rheostats (8533390080).
Beyond standard customs classification, dimmers may be subject to Section 301 tariffs on Chinese-origin goods. Additionally, dimmers intended for residential or commercial lighting circuits may need to comply with UL or ETL safety listing requirements and FCC Part 15 electromagnetic compatibility rules before sale in the US market — these are separate from customs admissibility.
Subheading 7 of 7 in heading 8533
Subheading 853339 · $1.2M of $92.0M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8533390040 | Wirewound Variable Resistors, Dimmers | $729K | 19.10% | 75.90% | $139K |
| 8533390080 | Wirewound Variable Resistors, NESOI | $450K | 10.94% | 82.57% | $49K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8533390080 | Wirewound Variable Resistors, NESOI | $983K |
| 8533390040 | Wirewound Variable Resistors, Dimmers | $317K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
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ImportsExports
Imports
$1.2MYoY · Pro
Exports
$1.3MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Imports · July 2026
origin
China and Vietnam together supply 61% of it.
customs district
destination
entry
rate provision · imports
21.8% enters free of duty; the effective duty rate is 15.98%.