Thyratron Gas-Filled Switching Tube from Canada
Thyratrons are gas-filled tubes containing low-pressure inert gas used for high-power switching and rectification in industrial applications. They qualify under HTS 8540.89.00 as other gas-filled tubes functioning through gas ionization triggered by cathode emission.
Duty Rate — Canada → United States
13.7%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Specify gas type (hydrogen/argon) and pressure ratings in technical documentation
• Hazardous material declarations required for gas-filled tubes during transport
• Distinguish from semiconductor thyristors under 8541; confirm gas discharge mechanism