Spark Gap Protective Tube
Gas-filled tube providing overvoltage protection by controlled spark discharge between electrodes. Used in telecom/power systems. HTS 8540.89.00.80 as other gas-filled tubes.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If lightning arresters
Complete surge protective devices fall under Chapter 85 heading 8535.
If semiconductor surge suppressors
Solid-state TVS diodes replace gas tubes in same application.
If telecom line protection
Telephone/telegraph apparatus parts include spark gaps.
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The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• UL/CSA safety certifications mandatory for electrical protection devices
• Specify breakdown voltage and gas fill to avoid semiconductor arrester classification
• Tower lightning protection systems classify under 8538.90
Related Products under HTS 8540.89.00.80
Hydrogen Thyratron Switching Tube
Gas-filled switching tube using hydrogen for fast high-power pulse generation in radar and pulsed power systems. Covered by HTS 8540.89.00.80 as other gas-filled tubes.
Storage Tube Memory Device
Electrostatic vacuum tube storing binary data as charge patterns on dielectric surface, read/written by electron beam. Rare computer memory technology classified under HTS 8540.89.00.80 as other tubes.
Geiger-Muller Counter Tube
Gas-filled tube detecting ionizing radiation through avalanche discharge between electrodes. Classified HTS 8540.89.00.80 as other gas/vapor filled tubes for radiation detection.
Xenon Flashtube Trigger Tube
Small gas-filled tube providing high-voltage trigger pulse for xenon flashtubes in photography/strobe lighting. HTS 8540.89.00.80 for other gas-filled tubes.
Vacuum Photomultiplier Tube PMT
A vacuum tube containing a photocathode that emits electrons when struck by photons, which are then multiplied to produce a measurable current. Classified under HTS 8540.89.00.80 as a photocathode tube not specifically covered by other subheadings in heading 8540. Used in scientific instruments like scintillation detectors.
Magnetron Vacuum Tube for Microwave
A vacuum tube that generates microwave signals through velocity modulation of electrons in a magnetic field, used in radar and microwave ovens. Falls under HTS 8540.89.00.80 as an other vacuum tube not specified elsewhere in 8540. Essential component for high-power RF generation.