Product classification
HS code for Wirewound variable resistors: 8533.39
Electrical resistors, wirewound variable, including rheostats and potentiometers, for a power handling capacity exceeding 20W (excluding heating).
Classification of wirewound variable resistors under HS 8533.39
Wirewound variable resistors, including rheostats and potentiometers, with a power handling capacity exceeding 20W are classified under HS code 8533.39. This classification is based on the device's ability to vary electrical resistance and its high-power durability. These components are constructed by winding a resistive wire around an insulating mandrel, often featuring a sliding contact or wiper that moves across the coils to change the resistance value. The "exceeding 20W" designation indicates that these components are designed for industrial or high-current applications where heat dissipation is a significant factor. In the Harmonized System, heading 8533 specifically covers electrical resistors that are not heating resistors. The classification process requires verifying the variable nature of the component and confirming that the manufacturer's rated wattage is above the 20W limit. These units are typically larger and more robust than consumer-grade electronics components, often featuring ceramic housings or heat sinks to manage the thermal energy generated during operation.
- Covers
- High-power industrial rheostats for motor control
- Heavy-duty wirewound potentiometers for machinery
- Dynamic braking resistors for industrial drives
- Load bank resistors for power supply and battery testing
- Variable power resistors for voltage regulation in heavy equipment
- Also under 8533.39
- Ohmite RLS series rheostats
- Vishay Sfernice P11 series
- TE Connectivity CGS series
- Bourns 3500 series
Codes often confused with 8533.39
Common mistake. This code is frequently confused with HS code 8533.31, which is reserved for wirewound variable resistors with a power capacity of 20W or less. Another common error is classifying these under 8533.40, which is a catch-all for other variable resistors (such as carbon or metal film) regardless of wattage. Because 8533.39 is specific to wirewound construction, using it for non-wirewound types is a classification error. Furthermore, heating resistors must be classified under 8516, not 8533.
Top exporters and importers of HS 853339 (the code used for wirewound variable resistors), 2025
In 2025, the largest exporter of HS 853339 (the code used for wirewound variable resistors) in UN Comtrade data was the United States, with 17% of world exports; the largest importer in UN Comtrade data was Thailand, with 19% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 853339, not only wirewound variable resistors.
Top exporters 2025 · share of world exports
- 1 United States $10M 17% of world exports
- 2 Taiwan* ~$6.4M 10% of world exports · partner records ↗
- 3 Germany $5.7M 9.3% of world exports
World total: $62M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Thailand $24M 19% of world imports
- 2 India $12M 9.3% of world imports
- 3 United States $11M 8.8% of world imports
World total: $127M Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries marked * did not, so their figures add up what other countries recorded trading with them, and their exports are valued at buyers' CIF prices. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. UN Comtrade records Taiwan as "Other Asia, not elsewhere specified". Saudi Arabia's exports under that code are left out: they are far too large to be trade with Taiwan, so mostly undisclosed partners. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM codes for wirewound variable resistors
Brazil splits HS 8533.39 into 2 NCM codes. Pick the one that matches your product:
- 8533.39.10Wirewound potentiometers, over 20 W
- 8533.39.90Other wirewound variable resistors, over 20 W
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about wirewound variable resistors
What is the HS code for Wirewound variable resistors?
The HS code for Wirewound variable resistors is 853339 (Electrical resistors; wirewound variable, including rheostats and potentiometers, for a power handling capacity exceeding 20W (excluding heating)). The HS code for wirewound variable resistors with a power capacity exceeding 20W is 8533.39.
How do I classify Wirewound variable resistors for customs?
Wirewound variable resistors is classified under HS code 853339 — Electrical resistors; wirewound variable, including rheostats and potentiometers, for a power handling capacity exceeding 20W (excluding heating). This is a 6-digit subheading level code.
One more relevant question
How do I determine the wattage for classification? The wattage is determined by the maximum power the resistor can safely dissipate under continuous operation, as specified in the manufacturer's technical data sheet.
Which countries are the top exporters of wirewound variable resistors (HS 853339)?
In 2025, the top exporters of HS 853339 (the code used for wirewound variable resistors) in UN Comtrade data were the United States ($10M, 17% of world exports), Taiwan (about $6.4M) and Germany ($5.7M). World exports came to about $62M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of wirewound variable resistors (HS 853339)?
In 2025, the top importers of HS 853339 (the code used for wirewound variable resistors) in UN Comtrade data were Thailand ($24M, 19% of world imports), India ($12M) and the United States ($11M). World imports came to about $127M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Is the HS code for Wirewound variable resistors the same in all countries?
The base HS code 853339 for Wirewound variable resistors is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for wirewound variable resistors in Brazil?
Brazil splits HS 853339 into 2 NCM codes, so the right one for wirewound variable resistors depends on the product's details: 8533.39.10 (Wirewound potentiometers, over 20 W), 8533.39.90 (Other wirewound variable resistors, over 20 W).