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SITCSection 7
U.S. imports of liquid dielectric transformers (SITC 77111) totaled $733.5M in July 2026, traded with 52 countries.
Importers of Liquid Dielectric Transformers paid $119.3M in duties in July 2026 — an effective duty rate of 16% on $727.1M in dutiable value, based on actual customs collections rather than the published tariff schedule. Liquid Dielectric Transformers imports of $733.5M in July 2026 ran 14% above the year-to-date monthly average of $643.8M.
Last updated: July 2026 dataLiquid dielectric transformers — most commonly oil-immersed power transformers used in utility substations and industrial distribution networks — are a critical infrastructure input subject to Section 232 national-security tariff considerations and, for certain origins, antidumping or countervailing duty orders. The liquid dielectric medium (typically mineral oil or synthetic ester fluid) provides both electrical insulation and thermal management, distinguishing these units from dry-type transformers and driving their use in high-voltage, high-capacity grid applications. Lead times for large power transformers can extend well beyond a year, making import planning and tariff exposure assessment essential for utilities and EPC contractors.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
4.4K shipments/mo
Basic heading 31 of 642 in section 7
Basic heading 77111 · $733.5M of $175.6B
Large liquid dielectric power transformers from certain countries have been subject to antidumping and countervailing duty orders, and the broader transformer category has drawn Section 232 national-security scrutiny. Importers should check the current scope of any active AD/CVD orders with the Department of Commerce and verify Section 232 applicability at the specific HTS subheading level before contracting for supply.
Yes — the classification of liquid dielectric transformers can turn on the nature and rating of the insulating fluid, as well as the transformer's kVA rating. Mineral-oil-filled and synthetic-ester-filled units may fall under different HTS subheadings, and kVA thresholds further subdivide the tariff schedule. Accurate technical specifications from the manufacturer are essential for correct entry.
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Imports · July 2026
origin
Mexico and Korea, South together supply 42% of it.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$733.5MYoY · Pro
Exports
$22.9MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.