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HSChapter 85
U.S. imports of electrical transformers (other than liquid dielectric), power handling capacity not exceeding 1 kva (HS 850431) totaled $65.9M in July 2026, traded with 64 countries.
Importers of Electrical Transformers (Other Than Liquid Dielectric), Power Handling Capacity Not Exceeding 1 KVA paid $11.6M in duties in July 2026 — an effective duty rate of 25% on $47.0M in dutiable value, based on actual customs collections rather than the published tariff schedule. Electrical Transformers (Other Than Liquid Dielectric), Power Handling Capacity Not Exceeding 1 KVA imports of $65.9M in July 2026 ran 12% above the year-to-date monthly average of $58.8M.
Last updated: July 2026 dataDry-type and other non-liquid-dielectric transformers rated at or below 1 KVA — including unrated units, those below 40 VA (8504314035), those between 40 VA and 1 KVA (8504314065), and units rated exactly at 1 KVA (8504316000) — serve consumer electronics, telecommunications, and light industrial applications. Mexico is the leading US supplier, followed by China and India, with China-origin goods subject to Section 301 tariff review. The sub-1 KVA range encompasses a wide variety of form factors, from wall-mount adapters to PCB-mounted signal transformers, making precise VA rating documentation essential for correct line assignment.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
4.3K shipments/mo
Unrated transformers fall under 8504312000, the dedicated line for transformers at or below 1 KVA that carry no rated capacity marking. Importers should document the absence of a rating on the commercial invoice and technical specs. If a transformer is capable of being rated but simply lacks a nameplate, CBP may request engineering data to confirm it does not exceed 1 KVA; having that documentation ready at entry avoids delays.
Transformers (8504.31) transfer electrical energy between two or more circuits through electromagnetic induction, typically with a defined turns ratio and separate primary and secondary windings. Inductors and chokes (8504.50) are single-winding devices used primarily for energy storage, filtering, or impedance control rather than voltage transformation. When a component performs both functions, classification follows the principal function, and a binding ruling from CBP may be warranted for borderline designs.
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ImportsExports
Imports
$65.9MYoY · Pro
Exports
$34.2MYoY · Pro
12-mo low · imports
YoY · ProThrough July 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 | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8504314065 | Transformers, Gt=40 Va But Lt 1 Kva, NESOI | $23.6M | 14.96% | 55.90% | $3.5M |
| 8504312000 | Transformers, Lt=1 Kva, Unrated, NESOI | $22.2M | 18.39% | 83.51% | $4.1M |
| 8504314035 | Transformers, Less Than 40 Va, NESOI | $17.1M | 19.67% | 77.38% | $3.4M |
| 8504316000 | Transformers, Rated at 1 Kva, NESOI | $2.9M | 20.73% | 67.72% | $604K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8504312000 | Transformers, Lt=1 Kva, Unrated, NESOI | $13.5M |
| 8504314035 | Transformers, Less Than 40 Va, NESOI | $8.6M |
| 8504314065 | Transformers, Gt=40 Va But Lt 1 Kva, NESOI | $6.5M |
| 8504316000 | Transformers, Rated at 1 Kva, NESOI | $5.6M |
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 · July 2026
origin
Mexico and China together supply 48% of it.
customs district
destination
entry
rate provision · imports
25.6% enters free of duty; the effective duty rate is 17.60%.