HS code · 6-digit subheading
HS Code 8504.90 – Electrical transformers, static converters and inductors; parts thereof
HS code 8504.90 is the 6-digit subheading for electrical transformers, static converters and inductors, parts thereof. It is used for transformer cores, inductor windings, heatsinks for converters, power module housings and rectifier bridge components.
What HS 8504.90 covers
This HS code covers parts of electrical transformers, static converters, and inductors, playing a crucial role in the global electronics and power equipment supply chain. It includes components and sub-assemblies specifically designed for the repair, assembly, or manufacturing of the complete apparatus classified under heading 8504. Importers and exporters are typically specialized component manufacturers, electronics assembly plants, and repair service providers who require specific parts to build or maintain power conversion and magnetic devices. The trade in these parts is essential for supporting the production of everything from large industrial transformers to miniature electronic inductors, emphasizing precision, material quality, and compatibility with specific end products.
- Covers
- Transformer cores
- Inductor windings
- Heatsinks for converters
- Power module housings
- Rectifier bridge components
- Control boards for inverters
- Transformer bobbins
- Examples
- Siemens transformer cores
- ABB converter modules
- TDK ferrite cores
- Vishay heatsinks
- Infineon power semiconductor packages
Codes often confused with 8504.90
Common mistake. Frequently confused with the complete apparatus codes like 850421 (liquid dielectric transformers) or 850440 (static converters) if the 'part' is a significant sub-assembly. Also, general electronic components (e.g., 8534 for printed circuits) if not clearly identifiable as a part of 8504 apparatus.
Top exporters and importers of HS code 850490, 2025
In 2025, the largest exporter of HS code 850490 in UN Comtrade data was China, with 30% of world exports; the largest importer in UN Comtrade data was the United States, with 21% of world imports. Mexico reports $521M of its heading 8504 exports without product detail (confidential), so it may also belong among the top exporters.
Top exporters 2025 · share of world exports
- 1 China $5.2B 30% of world exports
- 2 Hong Kong $1.3B 7.6% of world exports
- 3 Germany $1.1B 6.5% of world exports
Mexico reports $521M of its heading 8504 exports without product detail (confidential), so it may also belong among the top exporters.
World total: $17.4B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $3.6B 21% of world imports
- 2 Germany $1.2B 6.9% of world imports
- 3 Hong Kong $1.2B 6.7% of world imports
World total: $17.5B Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM codes for 8504.90 5
Brazil splits HS 8504.90 into 5 NCM codes, Mercosur's 8-digit tariff lines.
- 8504.90.10 Ferromagnetic powder coresNúcleos de pó ferromagnético
- 8504.90.20 Parts of ballasts for discharge lamps or tubesDe reatores para lâmpadas ou tubos de descarga
- 8504.90.30 Parts of liquid-filled or over 16 kVA transformersDe transformadores das subposições 8504.21, 8504.22, 8504.23, 8504.33 ou 8504.34
- 8504.90.40 Parts of converters, not rectifiers or chargersDe conversores estáticos, exceto de carregadores de acumuladores e de retificadores
- 8504.90.90 Other parts of transformers, converters, inductorsOutras
All Brazil NCM codes in heading 85.04 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 8504.90
What is HS code 850490?
HS code 850490 is a 6-digit subheading in the Harmonized System that covers: Electrical transformers, static converters and inductors; parts thereof. This HS code covers parts of electrical transformers, static converters, and inductors, playing a crucial role in the global electronics and power equipment supply chain. It includes components and sub-assemblies specifically designed for the repair, assembly, or manufacturing of the complete apparatus classified under heading 8504. Importers and exporters are typically specialized component manufacturers, electronics assembly plants, and repair service providers who require specific parts to build or maintain power conversion and magnetic devices. The trade in these parts is essential for supporting the production of everything from large industrial transformers to miniature electronic inductors, emphasizing precision, material quality, and compatibility with specific end products.
What products fall under HS code 850490?
Transformer cores, inductor windings, heatsinks for converters, power module housings, rectifier bridge components, control boards for inverters, transformer bobbins
What are common misclassifications for HS code 850490?
Frequently confused with the complete apparatus codes like 850421 (liquid dielectric transformers) or 850440 (static converters) if the 'part' is a significant sub-assembly. Also, general electronic components (e.g., 8534 for printed circuits) if not clearly identifiable as a part of 8504 apparatus.
Which countries are the top exporters of goods under HS code 850490?
In 2025, the top exporters of HS code 850490 in UN Comtrade data were China ($5.2B, 30% of world exports), Hong Kong ($1.3B) and Germany ($1.1B). World exports came to about $17.4B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Mexico reports $521M of its heading 8504 exports without product detail (confidential), so it may also belong among the top exporters.
Which countries are the top importers of goods under HS code 850490?
In 2025, the top importers of HS code 850490 in UN Comtrade data were the United States ($3.6B, 21% of world imports), Germany ($1.2B) and Hong Kong ($1.2B). World imports came to about $17.5B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
How is HS code 850490 structured?
HS code 850490 is a 6-digit subheading under the Harmonized System. The first 2 digits (85) identify the chapter, digits 3-4 (04) identify the heading, and digits 5-6 (90) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 850490?
Brazil splits HS code 850490 into 5 NCM codes: 8504.90.10 (Ferromagnetic powder cores), 8504.90.20 (Parts of ballasts for discharge lamps or tubes), 8504.90.30 (Parts of liquid-filled or over 16 kVA transformers), 8504.90.40 (Parts of converters, not rectifiers or chargers), 8504.90.90 (Other parts of transformers, converters, inductors). The first 6 digits of each match the HS code.