Sourcing wirewound rheostats from China
Wirewound rheostats from China carry 0% UK duty across both power bands. Classify by wirewound construction and power handling capacity; business-to-business components are outside RoHS scope, but the final assembly must comply. Cambridge China Bridge sources wirewound rheostats.
Duty and classification for wirewound rheostats
Heading 8533 covers electrical resistors, including rheostats and potentiometers, other than heating resistors. Wirewound rheostats fall under 8533 31 00 00 when power handling capacity does not exceed 20 W, or 8533 39 00 00 above that capacity. The table includes parts and a non-wirewound comparison line; that comparison line is not a code for wirewound rheostats.
Read from the UK Trade Tariff on 30 September 2026, both wirewound lines carried 0% duty for goods from China. The supplied tariff record lists no anti-dumping or countervailing duties, suspensions or attached import controls on these lines. The parts and comparison lines also carry 0%.
Confirm construction, function and power handling capacity from the manufacturer's datasheet before choosing the commodity code. For other resistor types, see the resistors and potentiometers guide. Budget separately for import VAT using the import duty and VAT guide.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Wirewound rheostats, power handling capacity not exceeding 20 W | 8533 31 00 00 | 0% | None |
| Wirewound rheostats, power handling capacity exceeding 20 W | 8533 39 00 00 | 0% | None |
| Resistor parts, including separately supplied rheostat parts | 8533 90 00 00 | 0% | None |
| Comparison: non-wirewound variable resistors exceeding 20 W | 8533 40 90 00 | 0% | None |
Specify the winding, wiper and mounting
Specify total resistance and tolerance, rated power, maximum working voltage, permitted current through the wiper, and the operating temperature and mounting conditions behind those ratings. Ask how the permitted load changes as the wiper moves along the winding. Agree shaft dimensions, mounting holes, terminal layout, direction of adjustment and mechanical stops against a drawing and approved sample.
For Great Britain, component parts sold business to business are outside the RoHS Regulations' scope, but the final assembly placed on the market must comply. Ask for material declarations tied to the exact part number to support the finished product's restricted-substance assessment.
Worked duty example
Illustrative example, not a quote: Illustrative batch of panel-mounted wirewound rheostats for machinery repairs under 8533 39 00 00, invoiced at £9,000 free on board, with £300 of freight and insurance to the UK. The customs value is £9,300. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £9,300, so it is £1,860. With no duty, the only import tax is the VAT, which a VAT-registered importer can usually reclaim. The import duty and VAT guide explains each step.
Inspection checklist
Resistance: measure total resistance and the adjustable path against the agreed tolerance; move the wiper through its travel and check for intermittent contact.
Load performance: test samples under the agreed mounting and load conditions, checking heating, resistance drift and wiper contact at different settings.
Mechanics: check shaft fit, adjustment torque, stops, mounting dimensions and terminal security against the approved drawing.
Traceability: match part numbers, batch labels and material declarations to the shipment; inspect the winding and ceramic support for transport damage.
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What goes wrong
A rheostat can meet its total resistance specification yet fail in use through a loose wiper, uneven contact or an unsuitable load at a partial setting. A quoted power rating without mounting and temperature conditions makes suppliers difficult to compare. Require those conditions in the purchase specification.
Wrong shaft dimensions prevent installation, damaged ceramic supports weaken the assembly, and substitutions can change heating or adjustment behaviour. Compare bulk samples with the approved sample and record defects using the quality inspection guide.
Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For components and parts, see sourcing for manufacturers.
Frequently asked questions
What is the UK import duty on wirewound rheostats from China?
Both wirewound power bands carry 0% duty in the supplied tariff record. No anti-dumping or countervailing duty, suspension or import control is listed on either line.
Which commodity code covers wirewound rheostats?
Use 8533 31 00 00 for power handling capacity not exceeding 20 W, or 8533 39 00 00 above that capacity. Confirm the construction and rating from the datasheet.
Does a business-to-business rheostat component need RoHS compliance?
Business-to-business component parts are outside RoHS scope, but the final assembly placed on the market must comply. Obtain part-specific material evidence for the finished product assessment.
What should I test before accepting a rheostat shipment?
Check total resistance, continuity during adjustment, wiper contact under the agreed load, heating, shaft fit, stops, terminals and ceramic supports against the approved specification.