U.S. imports of Liquid Dielectric Transformers Exceeding 10,000 KVA (HS 850423) totaled $370.0M in August 2026, imported from 23 countries.
Importers of Liquid Dielectric Transformers Exceeding 10,000 KVA paid $43.0M in duties in August 2026, an average duty rate of 11.62% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataLarge oil-filled (liquid dielectric) power transformers exceeding 10,000 KVA are critical grid infrastructure components used in transmission substations, and their long lead times — often 12 to 24 months — make supply-chain planning a strategic priority for utilities. The US schedule subdivides the heading by capacity tier: 10,001–100,000 KVA (8504230040, with further splits at 8504230041 and 8504230045) and above 100,000 KVA (8504230080). Mexico is the leading supplier, with South Korea and Brazil also significant; these transformers have been the subject of national security and grid-resilience policy discussions given their essential role in the US power grid.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
219 import shipments a month
The US schedule creates separate 10-digit lines for transformers in the 10,001–59,999 KVA range (8504230041), the 60,000–100,000 KVA range (8504230045), and above 100,000 KVA (8504230080). Each tier may carry different duty rates or be subject to different trade-remedy measures, so accurate nameplate capacity documentation from the manufacturer is essential for correct classification and duty calculation.
Beyond customs classification, large power transformers may require Department of Energy review under regulations governing bulk-power system equipment, and some configurations have been subject to executive orders restricting procurement from certain foreign adversary sources. Given manufacturing lead times of one to two years or more, utilities typically need to initiate procurement and import planning well in advance of project timelines, and should engage customs counsel early to address any applicable trade-remedy or national-security review requirements.
Subheading 2 of 11 in heading 8504
Subheading 850423 · $370.0M of $3.1B
ImportsExports
Imports
$370.0MYoY · free account
Exports
$1.3MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $4.3B of Liquid Dielectric Transformers Exceeding 10,000 KVA and exported $47.2M.
Through August 2026. Source: U.S. Census Bureau.
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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8504230080 | Liquid Dlctc Transformer Exceeding 100,000 Kva | $266.7M | 11.95% | 99.88% | $31.9M |
| 8504230041 | Liquid Dlctc Transform Gt 10000 But Lt=59999 Kva | $71.7M | 11.89% | 98.47% | $8.5M |
| 8504230045 | Liquid Dlctc Transform Gt 59999 But Lt=100000 Kva | $31.7M | 8.17% | 99.69% | $2.6M |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8504230040 | Liquid Dlctc Transform Gt 10000 But Lt=100000 Kva | $1.3M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Imports · August 2026
origin
Mexico and Brazil together supply 49% of it.
customs district
destination
entry
rate provision · imports
0.2% enters free of duty; duty collected equals 11.62% of imports for consumption.