RM Ferrite Core for Telecom Power Supplies from Japan
RM (round multi-aperture) ferrite cores for high-efficiency transformers in telecom rectifiers and DC-DC converters. HTS 8504.90.96.30 covers these ferrite parts designed for 100-400 kHz switching frequencies in network equipment. Optimized for thermal stability in continuous operation.
Duty Rate — Japan → United States
15%
Rate breakdown
9903.82.1015%Except as provided for in headings 9903.82.12, 9903.82.17 and 9903.85.68, derivative aluminum and steel articles with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 15 percent, as provided for in subdivision (f) of U.S. note 16 to this subchapter
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
Import Tips
• Obtain manufacturer test reports showing Curie temperature and core loss data for classification support
• For high-volume imports, consider bonded warehouse storage to manage duties on slow-moving inventory
• Distinguish between sendust cores (different HTS) via alloy composition certificates