U.S. imports of Liquid Dielectric Transformers, Power Handling Capacity Not Exceeding 650 KVA (HS 850421) totaled $82.4M in August 2026, imported from 47 countries.
Importers of Liquid Dielectric Transformers, Power Handling Capacity Not Exceeding 650 KVA paid $19.2M in duties in August 2026, an average duty rate of 23.34% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Liquid Dielectric Transformers, Power Handling Capacity Not Exceeding 650 KVA imports of $82.4M in August 2026 ran 18% below the year-to-date monthly average of $100.4M.
Last updated: August 2026 dataOil-filled (liquid dielectric) distribution transformers rated up to 650 KVA are a foundational component of utility and industrial power distribution networks, and the US schedule segments them by capacity into four lines spanning up to 50 KVA (8504210020), 51–100 KVA (8504210040), 101–500 KVA (8504210060), and 501–650 KVA (8504210080). Mexico is the leading US supplier in this size range, with South Korea and Canada also significant sources. Importers should note that liquid dielectric transformers have been subject to antidumping and countervailing duty proceedings from certain origins, making a thorough admissibility and trade-remedy review essential before entry.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
2.7K import shipments a month
Certain liquid dielectric transformers have been subject to antidumping and countervailing duty orders from specific countries of origin. Importers must check current AD/CVD orders with CBP and the Department of Commerce before entry, as the scope and covered origins can change. A customs broker or trade attorney should review the applicable scope rulings for the specific KVA rating and origin of each shipment.
A liquid dielectric transformer uses an insulating liquid — most commonly mineral oil, but also synthetic esters or silicone fluids — as both the primary electrical insulation medium and the cooling agent surrounding the core and windings. Dry-type transformers, which use air or solid insulation, classify under the non-liquid-dielectric provisions of heading 8504 (subheadings 8504.31–8504.34). The presence or absence of a liquid-filled tank is the key physical distinction CBP examines.
Subheading 7 of 11 in heading 8504
Subheading 850421 · $82.4M of $3.1B
ImportsExports
Imports
$82.4MYoY · free account
Exports
$5.7MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $1.2B of Liquid Dielectric Transformers, Power Handling Capacity Not Exceeding 650 KVA and exported $75.6M.
Through August 2026. Source: U.S. Census Bureau.
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 |
|---|---|---|---|---|---|
| 8504210020 | Liquid Dielectric Transformer Lt=50 Kva | $48.3M | 22.02% | 89.64% | $10.6M |
| 8504210040 | Liquid Dielect Transformer Gt 50kva But Lt=100kva | $17.9M | 24.70% | 98.87% | $4.4M |
| 8504210060 | Liquid Dielect Transformer Gt 100kva But Lt=500kva | $14.4M | 25.72% | 99.96% | $3.7M |
| 8504210080 | Liquid Dielect Transformer Gt 500kva But Lt=650kva | $1.8M | 26.27% | 100.00% | $471K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
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.
Trade Directory
List your company under HS 850421 — Liquid Dielectric Transformers, Power Handling Capacity Not Exceeding 650 KVA, so the companies trading it can find you. Be the first supplier listed.
Imports · August 2026
origin
Mexico and South Korea together supply 67% of it.
customs district
destination
entry
rate provision · imports
6.3% enters free of duty; duty collected equals 23.34% of imports for consumption.