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HSChapter 85
U.S. imports of electrical transformers over 500 kva (nesoi) (HS 850434) totaled $84.9M in July 2026, traded with 30 countries.
Importers of Electrical Transformers Over 500 KVA (NESOI) paid $6.9M in duties in July 2026 — an effective duty rate of 13% on $52.6M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 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.
832 shipments/mo
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 7 of 11 in heading 8504
Subheading 850434 · $84.9M of $3.2B
Supplier Network
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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8504340000 | Transformers, Gt 500 Kva, NESOI | $84.9M | 8.12% | 61.88% | $6.9M |
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 | $6.1M |
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.
ImportsExports
Imports
$84.9MYoY · Pro
Exports
$6.1MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Imports · July 2026
origin
Mexico and Canada together supply 64% of it.
customs district
destination
entry
rate provision · imports
38.4% enters free of duty; the effective duty rate is 8.12%.