Sourcing switchgear interlocks from China
Switchgear mechanical interlocks classified under heading 8538 carry 0% UK duty from China, with no duty variation in the supplied tariff lines. Workplace supply duties include safety information and necessary testing or examination. Check compatibility on the intended assembly. Cambridge China Bridge sources switchgear mechanical interlocks.
Zero duty on qualifying switchgear parts
Heading 8538 covers parts suitable for use solely or principally with apparatus of headings 8535, 8536 or 8537. For mechanical interlocks meeting that description, the residual other-parts line is the starting point for classification. The table shows product variants under the same code, rather than separate tariff subdivisions.
Read from the UK Trade Tariff on 1 October 2026, all supplied lines carried 0% duty for goods from China. The mechanical-parts line 8538 90 99 99 has no recorded anti-dumping or countervailing duty, suspension or attached import control in the supplied facts.
Confirm the commodity code using drawings, the host equipment and the supplied kit contents. Do not classify a general-purpose lock solely from its intended installation location. For the wider parts heading, see circuit-breaker operating mechanisms.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Mechanical interlock kits solely or principally for switchgear | 8538 90 99 99 | 0% | None |
Specify the interlock sequence and mounting geometry
Specify the switchgear model and revision, mounting holes, shaft centres, linkage travel, operating direction and fixing method. Provide a sequence drawing identifying permitted and blocked states of the breaker, isolator, earthing switch and door. For trapped-key designs, agree key identity, retention and release conditions. Define materials, corrosion protection, lubrication and the endurance test acceptance criteria.
For workplace articles where more specific product safety law does not apply, HSE identifies general supply-chain safety duties. These include safe-use information and instructions, subsequent revisions, and testing or examination necessary for compliance. Ask for installation and maintenance instructions alongside the agreed functional test record; use testing and certification support to resolve the applicable product rules.
Worked duty example
Illustrative example, not a quote: 400 switchgear mechanical interlock kits, illustrative order under 8538 90 99 99, invoiced at £36,000 free on board, with £5,000 of freight and insurance to the UK. The customs value is £41,000. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £41,000, so it is £8,200. 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
Fit: compare mounting positions, pin diameters, shaft engagement and linkage travel against approved drawings and an unenergised representative assembly.
Sequence: test permitted operations and attempts at prohibited operations, including intermediate positions, partial engagement and key retention where applicable.
Durability: repeat the agreed operating sequence and inspect springs, pins, pivots and fasteners for wear, loosening, sticking or incomplete return.
Arrival: check part identity, revision, key matching, corrosion, bent linkages and missing fixings. Keep batches traceable to functional test records through the inspection process.
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What goes wrong
A linkage can fit its mounting holes yet have the wrong travel or operating direction. Excess clearance can allow a prohibited operation; insufficient clearance can jam an otherwise permitted sequence. Test the interlock with the intended mechanism and door geometry, rather than accepting a demonstration of the loose component.
Mixed key identities, loose pivot fasteners, damaged springs and packing that allows rods to bend can change the operating sequence. Quarantine mismatched or damaged parts and repeat the agreed functional checks after installation. A replacement selected only by appearance can change when a door or earthing switch is released.
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 switchgear mechanical interlocks from China?
The supplied tariff facts show 0% duty for qualifying mechanical parts under 8538 90 99 99, with no recorded anti-dumping or countervailing duty.
What should I send a Chinese interlock factory?
Send the host switchgear model, revision, mounting drawing, linkage travel and sequence drawing. Identify every permitted and blocked operation, plus key retention conditions where applicable.
Does a switchgear mechanical interlock need CE or UKCA marking?
Confirm the applicable product rules for the exact design and supplied configuration before specifying marking. Include whether it is purely mechanical or incorporates electrical components in the compliance brief.
How do I check that an interlock works?
Use an unenergised representative assembly. Test permitted and prohibited operations, intermediate positions, key retention and repeat operation against the approved sequence drawing.