Toroidal Wound Ferrite Core for Power Transformers
A toroidal-shaped wound core made from ferrite material, pre-wound with copper magnet wire, designed specifically for incorporation into high-efficiency power transformers used in consumer electronics. It falls under HTS 8504.90.96.42 as a wound core intended for transformer assembly, featuring a closed magnetic path to minimize electromagnetic interference.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If not pre-wound or laminated only
Unwound or laminated cores without wire windings classify under other transformer parts subheadings, excluding specifically wound cores.
If assembled into a complete inductor
Once fully assembled with terminals and housing for independent use, it becomes a finished inductor rather than a transformer core part.
If wound for inductor use rather than transformers
Winding coils intended for inductors (not transformer cores) fall under insulated wire headings based on end-use application.
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Import Tips & Compliance
• Verify core specifications including winding turns, wire gauge, and material composition match transformer incorporation requirements to avoid reclassification as finished inductors
• Provide manufacturer datasheets proving the core is wound and solely for transformer assembly, as incomplete documentation often leads to duty reassessment
• Check for restrictions on electrical components from certain origins; declare insulation class and voltage rating accurately to prevent holds
Related Products under HTS 8504.90.96.42
E-I Laminated Wound Core for Distribution Transformers
An E-I shaped silicon steel laminated core with precision windings, manufactured for integration into medium-voltage distribution transformers in electrical grids. Classified under HTS 8504.90.96.42 due to its wound construction specifically for transformer incorporation, optimizing flux density and efficiency.
Three-Phase Wound Iron Core for Industrial Transformers
A heavy-duty three-phase wound core constructed from grain-oriented electrical steel, pre-wound for direct incorporation into large industrial step-up transformers. It meets HTS 8504.90.96.42 criteria as a specialized wound component essential for transformer manufacturing, supporting high current loads.
High-Frequency Wound Amorphous Core for Switch-Mode Transformers
A compact wound core made from amorphous metal alloy, optimized for high-frequency switch-mode power supply transformers in computing devices. Falls under HTS 8504.90.96.42 as it's pre-wound specifically for transformer integration, reducing energy losses at frequencies above 20kHz.
Planar Wound Core for PCB-Mount Transformers
Low-profile planar wound core with thin copper foil windings, engineered for surface-mount transformers on printed circuit boards in telecommunications equipment. Classified in HTS 8504.90.96.42 for its wound design dedicated to compact transformer assembly, enabling high power density.
CRGO Wound Core for Audio Output Transformers
Cold-rolled grain-oriented (CRGO) steel wound core with bifilar windings for high-fidelity audio output transformers in professional sound equipment. Meets HTS 8504.90.96.42 as a precision-wound component for transformer incorporation, preserving audio signal integrity.
Nanocrystalline Wound Core for EMI Suppression Transformers
Nanocrystalline alloy wound core designed for common-mode EMI suppression transformers in power lines and switchgear. Falls under HTS 8504.90.96.42 specifically as a wound core for transformer incorporation, offering superior noise attenuation.