High-Efficiency UI Stacked Transformer Core
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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If intended for use in variable frequency drives (VFDs)
VFD transformer cores may fall under static converter parts.
If the core includes integrated electronic controls
Electrical parts of machinery take precedence over pure transformer cores.
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Import Tips & Compliance
• 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
Related Products under HTS 8504.90.96.38
Silicon Steel Stacked Transformer Core
A laminated stack of silicon steel sheets forming a core designed for assembly into power distribution transformers. These cores provide the magnetic pathway essential for transformer operation and are imported as unfinished components for final winding and enclosure. Classified under HTS 8504.90.96.38 as stacked cores specifically for incorporation into transformers.
Three-Phase E-I Stacked Transformer Core
Interleaved E-I shaped laminations stacked for three-phase power transformer cores, typically using CRGO steel. These pre-assembled stacks reduce manufacturing time when windings are added domestically. Falls under HTS 8504.90.96.38 as stacked cores for transformer incorporation.
Toroidal Stacked Transformer Core Blank
Pre-cut and stacked ring-shaped silicon steel laminations forming toroidal cores for audio and power transformers. These require final winding but provide precise magnetic paths. Classified as stacked cores under HTS 8504.90.96.38.
Industrial Furnace Stacked Transformer Core
Heavy-gauge silicon steel stacks designed for high-current furnace transformers in steel mill applications. These cores handle extreme thermal and magnetic stresses. HTS 8504.90.96.38 specifically includes such stacked cores for transformer incorporation.
EV Charger Stacked Transformer Core
Compact high-frequency silicon steel stacks for Level 2 EV charger transformers, optimized for 240V/32A operation. Imported for final integration into charging station manufacturing. Meets HTS 8504.90.96.38 stacked core definition.
Amorphous Metal Stacked Transformer Core
Stacked laminations made from amorphous metal alloy (metglas) optimized for low-loss distribution transformers. These cores are pre-cut and interleaved for direct incorporation into transformer manufacturing processes. HTS 8504.90.96.38 applies to such unfinished stacked cores destined for transformer assembly.