U.S. imports of Electrical Transformers Over 500 KVA (NESOI) (HS 850434) totaled $103.2M in August 2026, imported from 33 countries.
Importers of Electrical Transformers Over 500 KVA (NESOI) paid $8.1M in duties in August 2026, an average duty rate of 7.87% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Electrical Transformers Over 500 KVA (NESOI) imports of $103.2M in August 2026 ran 20% above the year-to-date monthly average of $85.6M.
Last updated: August 2026 dataLarge-capacity electrical transformers exceeding 500 KVA are critical infrastructure components for power generation, transmission, and industrial distribution systems. The entire heading consolidates under a single 10-digit line, 8504340000, which is subject to Section 301 tariffs on goods of Chinese origin — a significant cost consideration given China's presence among top suppliers. Mexico leads US import supply, followed by South Korea and Germany, making USMCA origin qualification and KORUS duty treatment relevant planning factors for procurement teams. Lead times for high-KVA units can stretch to 12–18 months, so tariff exposure and supplier diversification deserve early attention in capital project planning.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
912 import shipments a month
No. Heading 850434 covers transformers with a power handling capacity exceeding 500 KVA. A unit rated at exactly 500 KVA would fall under the adjacent heading for transformers of 250–500 KVA. Confirm the nameplate rating and consult a licensed customs broker to ensure correct classification.
Yes. Transformers classified under 8504340000 and originating from China are subject to Section 301 tariffs in addition to the standard MFN duty rate. Importers should verify the current Section 301 list status and applicable exclusions before finalizing sourcing decisions.
Subheading 6 of 11 in heading 8504
Subheading 850434 · $103.2M of $3.1B
ImportsExports
Imports
$103.2MYoY · free account
Exports
$5.9MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $908.5M of Electrical Transformers Over 500 KVA (NESOI) and exported $54.3M.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
Mexico and Germany together supply 56% of it. Switzerland pays 14.7% duty; Canada 1.9%.
customs district
destination
entry
rate provision · imports
30.4% enters free of duty; duty collected equals 7.87% of imports for consumption.
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 |
|---|---|---|---|---|---|
| 8504340000 | Transformers, Gt 500 Kva, NESOI | $103.2M | 7.87% | 69.58% | $8.1M |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8504340000 | Transformers, Gt 500 Kva, NESOI | $5.9M |
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
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