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HSChapter 85
U.S. imports of electrical transformers (other than liquid dielectric), power handling capacity exceeding 16 kva but not exceeding 500 kva (HS 850433) totaled $63.0M in April 2026, traded with 41 countries.
Last updated: April 2026 dataDry-type transformers in the 16–500 KVA range are a primary choice for commercial buildings, data centers, and medium industrial facilities where oil-filled units are impractical or prohibited by fire codes. The US schedule splits this range at 50 KVA, with 8504330020 covering 16–50 KVA units and 8504330040 covering 51–500 KVA units. Mexico and Canada lead US import supply, with India and Germany also significant sources — reflecting both North American manufacturing integration and European specialty transformer production. Importers sourcing from India or Taiwan should verify current duty treatment, as neither country has a comprehensive US free-trade agreement.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Dry-type transformers eliminate the fire and environmental risk associated with mineral oil or other liquid dielectrics, making them the standard choice for indoor installations in commercial buildings, hospitals, data centers, and locations where a spill or fire involving transformer oil would be hazardous. Building codes and insurance requirements in many US jurisdictions mandate dry-type units for indoor service above certain KVA thresholds, which drives import demand for this heading.
The commercial invoice, packing list, and technical data sheet should all clearly state the nameplate rated KVA. For units near the 50 KVA breakpoint, CBP may request the manufacturer's nameplate data or test certificates. A unit rated at exactly 50 KVA classifies under 8504330020 (up to 50 KVA); one rated above 50 KVA goes to 8504330040. Discrepancies between invoice descriptions and nameplate ratings are a common examination trigger.
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Monthly import values over time