Sourcing clamp-on ferrite cores from China
Clamp-on ferrite suppression cores may use the residual electrical-parts line in heading 8548, which carries 0% UK duty from China. Confirm that no more specific heading applies, then agree cable fit and impedance performance before ordering. Cambridge China Bridge sources clamp-on ferrite suppression cores.
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Duty and classification for clamp-on cores
Read from the UK Trade Tariff on 11 October 2026, heading 8548 covers electrical parts of machinery or apparatus not specified or included elsewhere in the chapter. Every supplied line carries 0% duty from China. The residual line 8548 00 90 99 is a candidate for clamp-on suppression cores, subject to classification. The supplied facts record no anti-dumping or countervailing measures and no suspensions.
The residual line has import and export waste controls attached. Waste shipment controls apply only when the material is waste. For scrap or recovered cores from China, ask your customs broker to confirm the applicable requirements before shipment. The tariff flag should prompt a waste-status check rather than an assumption that new components require waste consent.
The table includes only the residual candidate because the other supplied lines describe different products. Do not declare a clamp-on core as the separately specified mains interference filter merely because both suppress interference. Confirm the commodity code using the drawing, materials and intended function. See the wider filter guide for related products.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Other electrical parts: candidate line for clamp-on ferrite suppression cores | 8548 00 90 99 | 0% | None |
Specify the ferrite, cable fit and test method
Specify the ferrite material grade, impedance curve across the intended interference frequencies, test fixture and cable arrangement. Agree acceptance limits using the same measurement method for the approved sample and production goods. A similar-looking housing is insufficient evidence of equivalent suppression.
Give the cable diameter or flat-cable dimensions, aperture dimensions, overall envelope, latch design and installation position. State whether the housing must reopen for servicing. Check a sample on the actual cable for closure, movement and sheath damage.
For incorporation into electrical products subject to hazardous-substance restrictions, obtain material declarations and supporting data for the ferrite, plastic housing and any adhesive so the finished product can meet those requirements. Match the documents to the ordered part and material specification.
Worked duty example
Illustrative example, not a quote: Illustrative order of 1,200 clamp-on ferrite suppression cores, subject to classification under 8548 00 90 99, invoiced at £1,200 free on board, with £600 of freight and insurance to the UK. The customs value is £1,800. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £1,800, so it is £360. 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
Performance: measure sampled cores using the agreed fixture and cable arrangement, and compare the impedance curve with the approved sample.
Ferrite condition: inspect for cracks, chipped mating faces, loose fragments and contamination that prevents the halves seating.
Cable fit and latch: close samples around the intended cable, check full engagement and confirm the housing neither slips excessively nor damages the sheath.
Identity and packing: match part references and batch labels to the order, and check that packing protects the ferrite from impact. Use the inspection guide to brief the inspection.
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What goes wrong
A replacement ferrite grade can fit the same housing but give a different impedance curve. Results also change when the supplier and buyer use different fixtures or cable arrangements. Approve the material and measurement method together, and compare production samples under matching conditions.
Oversized apertures allow movement, weak latches open during handling, and damaged mating faces prevent proper seating. Record these checks in the purchase specification and repeat them on arrival before releasing the batch to assembly.
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 clamp-on ferrite cores from China?
The supplied tariff snapshot gives 0% for 8548 00 90 99, with no anti-dumping or countervailing measure. Confirm that this residual line fits your core before declaring it.
Can I choose a ferrite core by cable diameter alone?
Cable fit is only part of the specification. Agree the ferrite grade, impedance curve, intended interference frequencies and measurement arrangement.
What should I ask for about restricted substances?
For cores incorporated into regulated electrical products, request material declarations and supporting data covering the ferrite, housing and adhesive, matched to the ordered part.
Why does a production core perform differently from the sample?
Check for a changed ferrite grade, damaged mating faces or incomplete closure. Also compare the test fixture and cable arrangement before attributing the difference to the material.