HTS Heading 8504

Electrical transformers, static converters (for example, rectifiers) and inductors; parts thereof

All 54 HTS codes under heading 8504 (electrical transformers), with their duty rates from the 2026 HTS Revision 23. General duty Free to 6.6%.

Every line of heading 8504

  • 8504 Electrical transformers, static converters (for example, rectifiers) and inductors; parts thereof.
  • 8504.10.00.00 Ballasts for discharge lamps or tubes (No.): General 3%; Special Free (A*,AU,B,BH,C,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8504.21.00 Having a power handling capacity not exceeding 650 kVA: General Free; Special none; Column 2 35%.
  • 8504.21.00.20 Having a power handling capacity not exceeding 50 kVA (No., kg).
  • 8504.21.00.40 Having a power handling capacity exceeding 50 kVA but not exceeding 100 kVA (No., kg).
  • 8504.21.00.60 Having a power handling capacity exceeding 100 kVA but not exceeding 500 kVA (No., kg).
  • 8504.21.00.80 Having a power handling capacity exceeding 500 kVA but not exceeding 650 kVA (No., kg).
  • 8504.22.00 Having a power handling capacity exceeding 650 kVA but not exceeding 10,000 kVA: General Free; Special none; Column 2 35%.
  • 8504.22.00.40 Having a power handling capacity exceeding 650 kVA but not exceeding 2,500 kVA (No., kg).
  • 8504.22.00.80 Having a power handling capacity exceeding 2,500 kVA but not exceeding 10,000 kVA (No., kg).
  • 8504.23.00 Having a power handling capacity exceeding 10,000 kVA: General 1.6%; Special Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8504.23.00.41 Having a power handling capacity exceeding 10,000 kVA but not exceeding 59,999 kVA (No., kg).
  • 8504.23.00.45 Having a power handling capacity exceeding 59,999 kVA but not exceeding 100,000 kVA (No., kg).
  • 8504.23.00.80 Having a power handling capacity exceeding 100,000 kVA (No., kg).
  • 8504.31 Having a power handling capacity not exceeding 1 kVA.
  • 8504.31.20.00 Unrated (under: Having a power handling capacity not exceeding 1 kVA) (No.): General Free; Special none; Column 2 35%.
  • 8504.31.40 Having a power handling capacity less than 1 kVA: General 6.6%; Special Free (A,AU,B,BH,C,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8504.31.40.35 Having a power handling capacity less than 40 VA (No.).
  • 8504.31.40.65 Having a power handling capacity 40 VA or greater (No.).
  • 8504.31.60.00 Having a power handling capacity of 1 kVA (No.): General 1.6%; Special Free (A,AU,B,BH,C,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8504.32.00.00 Having a power handling capacity exceeding 1 kVA but not exceeding 16 kVA (No., kg): General 2.4%; Special Free (A,AU,B,BH,C,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8504.33.00 Having a power handling capacity exceeding 16 kVA but not exceeding 500 kVA: General 1.6%; Special Free (A,AU,B,BH,C,CL,CO,D,E,IL,JO,JP,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8504.33.00.20 Having a power handling capacity exceeding 16 kVA but not exceeding 50 kVA (No., kg).
  • 8504.33.00.40 Having a power handling capacity exceeding 50 kVA but not exceeding 500 kVA (No., kg).
  • 8504.34.00.00 Having a power handling capacity exceeding 500 kVA (No., kg): General 1.6%; Special Free (A,AU,B,BH,CL,CO,D,E,IL,JO,JP,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8504.40 Static converters (under: Electrical transformers, static converters (for example, rectifiers) and inductors; parts thereof).
  • 8504.40.40.00 Speed drive controllers for electric motors (No.): General Free; Special none; Column 2 35%.
  • 8504.40.60 Suitable for physical incorporation into automatic data processing machines or units thereof of heading 8471: General Free; Special none; Column 2 35%.
  • 8504.40.60.01 With a power output not exceeding 50 W (No.).
  • 8504.40.60.07 With a power output exceeding 50 W but not exceeding 150 W (No.).
  • 8504.40.60.12 With a power output exceeding 150 W but not exceeding 500 W (No.).
  • 8504.40.60.18 Other (under: Suitable for physical incorporation into automatic data processing machines or units thereof of heading 8471) (No.).
  • 8504.40.70 Other (under: Power supplies for automatic data processing machines or units thereof of heading 8471; power supplies for goods of subheading 8443.31 or 8443.32; power supplies for monitors of subheading 8528.42 or 8528.52 or projectors of subheading 8528.62): General Free; Special none; Column 2 35%.
  • 8504.40.70.01 With a power output not exceeding 50 W (No.).
  • 8504.40.70.07 With a power output exceeding 50 W but not exceeding 150 W (No.).
  • 8504.40.70.12 With a power output exceeding 150 W but not exceeding 500 W (No.).
  • 8504.40.70.18 Other (under: Other) (No.).
  • 8504.40.85.00 For telecommunication apparatus (No.): General Free; Special none; Column 2 35%.
  • 8504.40.95 Other (under: Static converters): General Free; Special none; Column 2 35%.
  • 8504.40.95.10 With a power output not exceeding 50 W (No.).
  • 8504.40.95.20 With a power output exceeding 50 W but not exceeding 150 W (No.).
  • 8504.40.95.30 With a power output exceeding 150 W but not exceeding 500 W (No.).
  • 8504.40.95.40 Other (under: Power supplies) (No.).
  • 8504.40.95.50 Other (under: Rectifiers and rectifying apparatus) (No.).
  • 8504.40.95.71 Of a capacity not exceeding 200 W (No.).
  • 8504.40.95.73 Of a capacity exceeding 200 W but not exceeding 650 W (No.).
  • 8504.40.95.75 Of a capacity exceeding 650 W but not exceeding 20,000 W (No.).
  • 8504.40.95.77 Of a capacity exceeding 20,000 W but not exceeding 125,000 W (No.).
  • 8504.40.95.78 Of a capacity exceeding 125,000 W but not exceeding 1,000,000 W (No.).
  • 8504.40.95.79 Other (under: Inverters) (No.).
  • 8504.40.95.80 Other (under: Other) (No.).
  • 8504.50 Other inductors (under: Electrical transformers, static converters (for example, rectifiers) and inductors; parts thereof).
  • 8504.50.40.00 For power supplies for automatic data processing machines or units thereof of heading 8471; power supplies for goods of subheading 8443.31 or 8443.32; power supplies for monitors of subheading 8528.42 or 8528.52 or projectors of subheading 8528.62; for telecommunication apparatus (No.): General Free; Special none; Column 2 35%.
  • 8504.50.80.00 Other (under: Other inductors) (No.): General Free; Special none; Column 2 35%.
  • 8504.90 Parts (under: Electrical transformers, static converters (for example, rectifiers) and inductors; parts thereof).
  • 8504.90.20.00 Printed circuit assemblies (under: Of power supplies for automatic data processing machines or units thereof of heading 8471; of power supplies for goods of subheading 8443.31 or 8443.32; of power supplies for monitors of subheading 8528.42 or 8528.52 or projectors of subheading 8528.62) (No.): General Free; Special none; Column 2 35%.
  • 8504.90.41.00 Other (under: Of power supplies for automatic data processing machines or units thereof of heading 8471; of power supplies for goods of subheading 8443.31 or 8443.32; of power supplies for monitors of subheading 8528.42 or 8528.52 or projectors of subheading 8528.62) (No.): General Free; Special none; Column 2 35%.
  • 8504.90.65.00 Of the goods of subheading 8504.40 or 8504.50 for telecommunication apparatus (No.): General Free; Special none; Column 2 35%.
  • 8504.90.75.00 Other (under: Printed circuit assemblies) (No.): General Free; Special none; Column 2 35%.
  • 8504.90.96 Other (under: Other): General Free; Special none; Column 2 35%.
  • 8504.90.96.10 For transformers (under: Ferrites) (No.).
  • 8504.90.96.30 Other (under: Ferrites) (No.).
  • 8504.90.96.34 Laminations for incorporation into stacked cores (No., kg).
  • 8504.90.96.38 Stacked cores for incorporation into transformers (No., kg).
  • 8504.90.96.42 Wound cores for incorporation into transformers (No., kg).
  • 8504.90.96.46 Other (under: Of transformers) (No., kg).
  • 8504.90.96.50 Of static converters (under: Other parts) (No.).
  • 8504.90.96.90 Other (under: Other parts) (No.).

From MFG Calcs data: Transformers and power supplies

U.S. imports of transformers and power supplies (heading 8504) came to $31.76B in 2025, with $3.66B in calculated duty: an effective duty of 11.5%, every duty included.

Effective duty in Sep 2026: 13.2%, against 17.1% in Sep 2025.

Largest sources in 2025: Mexico $6.21B at 2.9% effective duty; Thailand $3.20B at 10.5% effective duty; China $3.04B at 47.1% effective duty; South Korea $2.17B at 6.4% effective duty; Taiwan $2.05B at 11.1% effective duty.

These are family totals from U.S. import statistics published through USITC DataWeb, not this heading's rate alone; effective duty is calculated duty as a share of customs value, an estimate, not a ruling.

About these rates

The rates are those printed in the 2026 HTS Revision 23, published by the U.S. International Trade Commission. A 10-digit statistical line takes the rates printed on the 8-digit line above it. Chapter 99 duties (Section 232, Section 301, IEEPA) depend on the product, the origin and the date, are charged on top, and are not included. A code here is a strong lead, not a ruling: confirm it with a customs broker or a CBP binding ruling.

Last reviewed 2026-11-12.