HTS code 9902.16.91 covers "Printed circuit assemblies suitable for use solely with ground fault circuit interrupters (GFCIs) and arc fault circuit interrupters (AFCIs) of subheading 8536.30.80 (provided for in subheading 8538.90.30) " under the US Harmonized Tariff Schedule. This is the official duty rate charged by US Customs when this product is imported into the United States, sourced directly from the U.S. International Trade Commission and refreshed daily.