High-Efficiency UI Stacked Transformer Core from Germany
UI-shaped silicon steel laminations stacked and hinged for easy assembly in high-efficiency transformers used in renewable energy inverters. These cores meet DOE efficiency standards when fully assembled. HTS 8504.90.96.38 covers such pre-stacked configurations.
Duty Rate — Germany → United States
25%
Rate breakdown
9903.82.0925%Except as provided for in headings 9903.82.16 and 9903.85.68, articles of copper and derivative aluminum and steel articles, as provided for in subdivisions (c)(vi)–(viii) of U.S. note 16 to this subchapter
9903.03.060%Articles of aluminum, of steel, or of copper or derivative aluminum or steel articles; passenger vehicles (sedans, sport utility vehicles, crossover utility vehicles, minivans, and cargo vans) and light trucks; parts of passenger vehicles (sedans, sport utility vehicles, crossover utility vehicles, minivans, and cargo vans) and light trucks; medium- and heavy-duty vehicles; parts of medium- and heavy-duty vehicles; wood products; and semiconductor articles, of any country, as provided in subdivision (aa)(v) of U.S. note 2 to this subchapter
Import Tips
• Efficiency class documentation (e.g
• NEMA standards) supports high-efficiency claims during customs review
• Hinge mechanism details must show temporary assembly only—no permanent fixtures for parts status
• Mark packages with 'For 50/60Hz transformer incorporation only' to prevent misuse classification