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HSChapter 85
U.S. imports of wirewound variable resistors (rheostats & potentiometers), power capacity exceeding 20 w (HS 853339) totaled $1.3M in April 2026, traded with 24 countries.
Importers of Wirewound Variable Resistors (Rheostats & Potentiometers), Power Capacity Exceeding 20 W paid $196K in duties in April 2026 — an effective duty rate of 19% on $1.0M 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 $1.3M in April 2026 ran 26% above the year-to-date monthly average of $1.0M.
Last updated: April 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.
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.
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 8533390040 | WIREWOUND VARIABLE RESISTORS, DIMMERS | $897K | 21.24% | $153K |
| 8533390080 | WIREWOUND VARIABLE RESISTORS, NESOI | $366K | 14.35% | $43K |
WIREWOUND VARIABLE RESISTORS, DIMMERS
WIREWOUND VARIABLE RESISTORS, NESOI
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8533390080 | WIREWOUND VARIABLE RESISTORS, NESOI | $886K |
| 8533390040 | WIREWOUND VARIABLE RESISTORS, DIMMERS | $247K |
WIREWOUND VARIABLE RESISTORS, NESOI
2.7M no
WIREWOUND VARIABLE RESISTORS, DIMMERS
16.4K no
MACH FOR RECP/CONVR/TRANS/REGN OF VOICE/IMAGE/DATA
HS 851762
SOLID-STATE NON-VOL SEMICONDUCTOR STORAGE DEVICES
HS 852351
SMARTPHONES
HS 851713
PROCESSORS AND CONTROLLERS, ELECTRONIC INTEG CIRCT
HS 854231
CONTROLS ETC W ELECT APPR F ELECT CONT NOV 1000 V
HS 853710
STATIC CONVERTERS; ADP POWER SUPPLIES
HS 850440
| Port | Imports | Exports | Balance |
|---|---|---|---|
| ANCHORAGE, AK | $426K | $13K | -$414K |
| WASHINGTON, DC | $9K | $220K | +$211K |
| DALLAS-FORT WORTH, TX | $180K | -- | -$180K |