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HSChapter 85
U.S. imports of liquid dielectric transformers, power handling capacity exceeding 10,000 kva (HS 850423) totaled $505.6M in April 2026, traded with 22 countries.
Importers of Liquid Dielectric Transformers, Power Handling Capacity Exceeding 10,000 KVA paid $49.0M in duties in April 2026 — an effective duty rate of 9.8% on $497.1M in dutiable value, based on actual customs collections rather than the published tariff schedule. Liquid Dielectric Transformers, Power Handling Capacity Exceeding 10,000 KVA imports of $505.6M in April 2026 ran 64% above the year-to-date monthly average of $308.6M.
Last updated: April 2026 dataLarge power transformers (LPTs) rated above 10,000 KVA are critical, long-lead-time assets for high-voltage transmission infrastructure, and their import classification under this heading carries significant supply-chain and national-security implications. The US schedule further subdivides by capacity: 8504230041 (10,000–59,999 KVA), 8504230045 (60,000–99,999 KVA), and 8504230080 (100,000 KVA and above), with 8504230040 as a broader residual line. Mexico and South Korea lead US supply, with Brazil and Austria also notable sources. Given the strategic importance of LPTs to grid reliability, importers should be aware of potential executive-order-based procurement restrictions and lengthy customs examination timelines for these oversized shipments.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
The additional breakpoints at 60,000 KVA and 100,000 KVA reflect the distinct manufacturing complexity, pricing tiers, and strategic significance of very large transmission transformers. Units above 100,000 KVA (8504230080) are among the most capital-intensive electrical imports, often custom-built for specific grid applications, and the granular classification supports more precise trade monitoring and potential policy responses related to grid security.
Yes. Executive orders related to bulk-power system security have established a framework under which the Department of Energy can review and restrict procurement of certain bulk-power system electric equipment — including large power transformers — from foreign adversary origins. Importers and utilities should consult with legal counsel and the Department of Energy's Office of Electricity before finalizing procurement from affected origins, as restrictions can apply even after goods have cleared CBP.
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Monthly import values over time
| Country | Imports | Exports | Balance |
|---|---|---|---|
| KOREA, SOUTH | $123.4M | -- | -$123.4M |
| BRAZIL | $99.7M | -- | -$99.7M |
| MEXICO | $85.0M | -- | -$85.0M |
| AUSTRIA | $55.8M | -- | -$55.8M |
| TURKEY | $30.8M | -- | -$30.8M |
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 8504230080 | LIQUID DLCTC TRANSFORMER EXCEEDING 100,000 KVA | $368.7M | 9.10% | $33.4M |
| 8504230041 | LIQUID DLCTC TRANSFORM GT 10000 BUT LT=59999 KVA | $85.2M | 14.20% | $11.3M |
| 8504230045 | LIQUID DLCTC TRANSFORM GT 59999 BUT LT=100000 KVA | $51.7M | 8.49% | $4.3M |
LIQUID DLCTC TRANSFORMER EXCEEDING 100,000 KVA
LIQUID DLCTC TRANSFORM GT 10000 BUT LT=59999 KVA
LIQUID DLCTC TRANSFORM GT 59999 BUT LT=100000 KVA
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8504230040 | LIQUID DLCTC TRANSFORM GT 10000 BUT LT=100000 KVA | $1.8M |
| 8504230080 | LIQUID DLCTC TRANSFORMER EXCEEDING 100,000 KVA | $0 |
LIQUID DLCTC TRANSFORM GT 10000 BUT LT=100000 KVA
8 no
LIQUID DLCTC TRANSFORMER EXCEEDING 100,000 KVA
MACH FOR RECP/CONVR/TRANS/REGN OF VOICE/IMAGE/DATA
HS 851762
SOLID-STATE NON-VOL SEMICONDUCTOR STORAGE DEVICES
HS 852351
SMARTPHONES
HS 851713
PROCESSORS AND CONTROLLERS, ELECTRONIC INTEG CIRCT
HS 854231
CONTROLS ETC W ELECT APPR F ELECT CONT NOV 1000 V
HS 853710
STATIC CONVERTERS; ADP POWER SUPPLIES
HS 850440
| State | Imports | Exports | Balance |
|---|---|---|---|
| Texas | $133.1M | -- | -$133.1M |
| North Carolina | $116.8M | -- | -$116.8M |
| Louisiana | $82.4M | -- | -$82.4M |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| HOUSTON, TX | $199.5M | -- | -$199.5M |
| LAREDO, TX | $70.8M | -- | -$70.8M |
| NEWARK, NJ | $38.3M | -- | -$38.3M |