Chapter 8546 — Customs Tariff Headings
Products classified under Tariff item 85.46
Aerial Glass Insulator for Cable TV Lines
A glass aerial insulator designed to support and electrically isolate coaxial cables in cable television and broadband distribution networks. Its glass construction provides the necessary dielectric strength and weather resistance for overhead telecommunications infrastructure, qualifying it as an electrical insulator of glass under tariff item 8546.10.00.
8546.10.00Glass Bird Diverter Insulator
A glass bird diverter insulator combines a glass insulator with a bird diverter marker, designed for overhead transmission lines. It provides both electrical isolation and a visual deterrent to prevent avian perching and collisions. This product falls under tariff item 8546.10.00 as it is an electrical insulator made of glass.
8546.10.00Glass Fog-Type Disc Insulator
A fog-type toughened glass disc insulator with an extended creepage distance, designed for overhead power lines in polluted or coastal environments. The glass body provides electrical insulation and resists tracking, making it classifiable as an electrical insulator of glass under tariff item 8546.10.00.
8546.10.00Glass Insulator for Railway Electrification
A glass insulator specifically designed for catenary support structures in railway overhead electrification systems. It provides high mechanical strength and electrical insulation for the power supply lines, qualifying as an electrical insulator of glass under tariff item 8546.10.00.
8546.10.00Glass Post Insulator for Substation Equipment
A solid glass post insulator used to support busbars and equipment in high-voltage substations. Its glass construction provides vertical compression strength and electrical insulation, making it classifiable as an electrical insulator of glass under tariff item 8546.10.00.
8546.10.00Glass Shackle Insulator for Rural Distribution
A glass shackle or egg insulator used in rural low-voltage distribution systems for dead-end strain applications. It provides electrical isolation and mechanical support for anchor poles, qualifying as an electrical insulator of glass under tariff item 8546.10.00.
8546.10.00Glass Spool Insulator for Low-Voltage Lines
A small glass spool insulator used on low-voltage distribution lines and service drops for conductor support and insulation. Its molded glass construction provides dielectric isolation, making it classifiable as an electrical insulator of glass under tariff item 8546.10.00.
8546.10.00Glass Strain Insulator for Guy Wires
A glass egg-shaped strain insulator used to electrically isolate guy wires on transmission towers from ground potential. It is designed for tensile strain applications and provides electrical insulation, qualifying as an electrical insulator of glass under tariff item 8546.10.00.
8546.10.00Glass Surge Arrester Housing Insulator
A glass surge arrester housing insulator is a toughened glass shell used to encase porcelain surge arrester cores in lightning protection systems. It provides external insulation and mechanical protection for the arrester. This product is classified under 8546.10.00 as an electrical insulator made of glass.
8546.10.00Glass Suspension Insulator for High-Voltage Power Lines
A toughened glass disc insulator designed for suspending overhead high-voltage transmission lines, providing electrical insulation between conductors and support structures. Its glass construction ensures high dielectric strength and mechanical reliability, making it classifiable as an electrical insulator of glass under tariff item 8546.10.00.
8546.10.00Hollow Glass Core Insulator for Switchgear
A hollow cylindrical glass insulator used as housing for high-voltage bushings in electrical switchgear and transformers. It provides high dielectric insulation and mechanical protection, qualifying as an electrical insulator of glass under tariff item 8546.10.00.
8546.10.00Insulator Piercing Glass Connector
An insulator piercing glass connector is a glass-bodied connector used to tap distribution lines without interrupting service. It provides electrical insulation and a secure connection point for medium-voltage lines. This product falls under tariff item 8546.10.00 as an electrical insulator made of glass.
8546.10.00Long Rod Glass Insulator for Compact Lines
A long rod toughened glass insulator for compact overhead line designs requiring higher phase spacing. It provides electrical insulation and mechanical strength in space-optimized transmission corridors, qualifying as an electrical insulator of glass under tariff item 8546.10.00.
8546.10.00Tempered Glass Pin Insulator for Utility Poles
A tempered glass pin-type insulator used on utility poles for medium-voltage distribution lines, preventing electrical current leakage. Its glass construction provides reliable insulation and weather resistance, making it classifiable as an electrical insulator of glass under tariff item 8546.10.00.
8546.10.00Toughened Glass Cap and Pin Insulator
A toughened glass cap and pin insulator for 11-33kV transmission lines using traditional suspension string configuration. It provides electrical insulation and prevents tracking and flashover, qualifying as an electrical insulator of glass under tariff item 8546.10.00.
8546.20.0069kV Suspension Disc Insulators
Porcelain disc suspension insulators rated at 69kV, used in strings for overhead transmission towers. Each cap-and-pin unit provides high mechanical strength and contamination resistance. This product falls under tariff item 8546.20.00 as a ceramic electrical insulator.
8546.20.00Alumina Ceramic Feedthrough Insulator
A hermetically sealed 99.5% alumina ceramic feedthrough insulator designed for high-vacuum systems, allowing conductors to pass through barriers while maintaining electrical insulation. It is used in RF and microwave applications where vacuum integrity and insulation are critical. This product falls under tariff item 8546.20.00 as it is a ceramic electrical insulator.
8546.20.00Alumina Ceramic Post Insulators
Alumina ceramic post insulators are cylindrical supports made from 95% alumina ceramic, designed for use in electrical substations to support busbars and equipment up to 36kV. They provide high puncture resistance and tracking resistance, making them suitable for polluted environments. These insulators fall under tariff item 8546.20.00 as they are electrical insulators made of ceramics.
8546.20.00Alumina Ceramic Spool Insulator
A precision-machined spool-shaped insulator made from 95% alumina ceramic, used in electrical coils and transformers to support and insulate wires. It prevents electrical short circuits and provides mechanical stability. This product is classified under tariff item 8546.20.00 as a ceramic electrical insulator.
8546.20.00Alumina Ceramic Suspension Insulator
This high-purity alumina ceramic insulator is used in strings for overhead power transmission lines at 132kV and above in low-frequency AC systems. It provides superior puncture resistance and is capped with forged steel fittings for mechanical strength. As a ceramic insulator, it is classified under tariff item 8546.20.00.
8546.20.00ANSI C29.2 Suspension Insulators
These porcelain suspension insulators conform to ANSI C29.2 specifications and are designed for 115kV transmission lines. The fog-type design resists surface contamination and provides superior flashover protection in polluted environments. As ceramic electrical insulators, they fall under tariff item 8546.20.00.
8546.20.00Beryllia Ceramic RF Insulator
A beryllium oxide (BeO) ceramic insulator for RF power transistors, offering high thermal conductivity while providing electrical insulation. It is a specialized ceramic used in high-frequency applications. This product falls under tariff item 8546.20.00 as a ceramic electrical insulator.
8546.20.00Boron Nitride Ceramic High-Voltage Spacer
This boron nitride ceramic composite spacer insulator is designed for vacuum interrupters in high-voltage switchgear, operating at 72.5kV in low-frequency applications. It offers superior arc resistance and is used in demanding switchgear environments. As a ceramic insulator, it is classified under tariff item 8546.20.00.
8546.20.00Ceramic Pothead Insulator
A large porcelain pothead insulator used for cable termination in substations, rated for 69-230kV. It provides stress relief and electrical insulation for high-voltage cables. This product is classified under tariff item 8546.20.00 as a ceramic electrical insulator.
8546.20.00Cordierite Ceramic Bobbin Insulator
A cordierite ceramic bobbin for winding magnet wire in inductors and relays, providing interlayer insulation and low thermal expansion. It is used in electrical components to prevent short circuits. This product falls under tariff item 8546.20.00 as a ceramic electrical insulator.
8546.20.00Cordierite Ceramic Hollow Insulator
This hollow core cordierite ceramic insulator is used for GIS switchgear in high-voltage substations, operating in low-frequency environments with excellent thermal shock resistance. It is used for bushing cores in SF6 environments. As a ceramic insulator, it is classified under tariff item 8546.20.00.
8546.20.00Cordierite Ceramic Stand-Off Insulators
Cordierite ceramic stand-off insulators are threaded components used to mount electrical parts in high-frequency RF equipment, providing phase-to-phase insulation with a low dielectric constant. They are made from cordierite ceramic, a material known for its thermal stability and electrical insulating properties. These insulators are classified under tariff item 8546.20.00 as ceramic electrical insulators.
8546.20.00High-Alumina Ceramic Spool Insulator
This spool-shaped high-alumina ceramic insulator is used for guy wire strain relief in low-frequency transmission structures up to 230kV. It offers high tracking resistance per IEC 60273 standards. As a ceramic insulator, it is classified under tariff item 8546.20.00.
8546.20.00High-Purity Alumina Submount Insulator
A 99.9% alumina ceramic submount for power semiconductor modules, providing thermal and electrical isolation. It is used in IGBT modules to mount and insulate semiconductor devices. This product is classified under tariff item 8546.20.00 as a ceramic electrical insulator.
8546.20.00High-Voltage Porcelain Post Insulator
A cylindrical porcelain insulator designed for supporting high-voltage power lines on utility poles, featuring a glazed surface for weather resistance. It provides electrical insulation and mechanical support. This product falls under tariff item 8546.20.00 as a ceramic electrical insulator.
8546.20.00High-Voltage Porcelain Suspension Insulators
High-voltage porcelain suspension insulators are designed to support overhead power transmission lines rated 69kV or higher. Made from high-alumina porcelain, they provide electrical insulation and mechanical support for conductors. These insulators are classified under tariff item 8546.20.00 as they are electrical insulators made of ceramics.
8546.20.00Horizontal Line Post Insulators
These ceramic horizontal line post insulators are designed for 46kV distribution systems, featuring trunnion mounting for crossarm applications. They are built to handle high mechanical loads while providing electrical reliability in low-frequency circuits. As ceramic insulators, they are classified under tariff item 8546.20.00.
8546.20.00Industrial Kiln Ceramic Insulator Tubes
Industrial kiln ceramic insulator tubes are high-temperature alumina tubes used to insulate heating element wires in electric kilns and furnaces, operating up to 1700°C. They provide electrical isolation in oxidizing atmospheres. These tubes are classified under tariff item 8546.20.00 as ceramic electrical insulators.
8546.20.00Laboratory Mullite Electrical Insulators
Laboratory mullite electrical insulators are standoffs and tubes made from mullite ceramic (3Al2O3·2SiO2) for use in high-voltage testing equipment and spark testers. They offer excellent arc resistance and machinability. These insulators are classified under tariff item 8546.20.00 as ceramic electrical insulators.
8546.20.00Line Post Porcelain Insulators
These station post ceramic insulators are rated for 15kV to 69kV and are designed for vertical mounting on utility poles in distribution substations. They provide cantilever strength for line support in high-voltage, low-frequency circuits. As ceramic insulators, they are classified under tariff item 8546.20.00.
8546.20.00Machinable Ceramic Insulator Sleeve
A Macor machinable glass-ceramic sleeve insulator for custom electrical standoffs in prototypes, offering machinability and insulation properties. It is used in electrical applications where custom shapes are required. This product is classified under tariff item 8546.20.00 as a ceramic electrical insulator.
8546.20.00Multilayer Ceramic Feedthrough Insulators
Multilayer ceramic feedthrough insulators are hermetic feedthroughs with multiple gold-plated pins in a 99.5% alumina body, designed for vacuum chamber penetrations in semiconductor equipment. They are vacuum tight to 1x10^-9 Torr. These insulators are classified under tariff item 8546.20.00 as ceramic electrical insulators.
8546.20.00Pin-Type Porcelain Insulators
These ceramic pin-type insulators support overhead distribution lines up to 33kV, featuring a single pin mounting design. They provide both electrical insulation and mechanical attachment for crossarms in low-frequency systems. As ceramic insulators, they are classified under tariff item 8546.20.00.
8546.20.00Porcelain High-Voltage Post Insulator
This ceramic post insulator is made from high-alumina porcelain and is designed for supporting high-voltage conductors in substations operating at low frequencies (50-60 Hz). It features a glazed surface for weather resistance and mechanical durability. As a ceramic insulator, it is classified under tariff item 8546.20.00.
8546.20.00Porcelain Pin-Type Insulator
A traditional porcelain pin insulator for distribution poles (11-33kV), screwed onto wooden crossarms. It provides primary electrical insulation and mechanical support for overhead lines. This product falls under tariff item 8546.20.00 as a ceramic electrical insulator.
8546.20.00Porcelain Pin-Type Insulators
Porcelain pin-type insulators are designed for distribution poles in the 11-33kV class, with cemented steel pins for mechanical attachment. They feature a brown glaze finish that resists contamination tracking. These insulators are classified under tariff item 8546.20.00 as ceramic electrical insulators.
8546.20.00Porcelain Station Post Insulator
This Class 5 porcelain station post insulator is designed for 69kV bus support in low-frequency indoor switchyards, with high cantilever strength. It conforms to ANSI C29.9 standards. As a ceramic insulator, it is classified under tariff item 8546.20.00.
8546.20.00Porcelain Suspension Insulator Disc
A single porcelain disc unit for string suspension insulators in extra-high-voltage transmission lines, featuring a ball-and-socket design. It provides electrical insulation and mechanical strength. This product is classified under tariff item 8546.20.00 as a ceramic electrical insulator.
8546.20.00Porcelain Suspension Insulators
These high-voltage porcelain suspension insulators are designed for suspending overhead power transmission lines, typically rated 69kV to 230kV. They provide electrical insulation and mechanical support in low-frequency AC systems. As ceramic insulators, they are classified under tariff item 8546.20.00.
8546.20.00Porcelain Transformer Bushing Insulator
This C-130 class porcelain bushing is designed for oil-immersed power transformers rated 115kV in low-frequency 60Hz service. It features alternating petticoat sheds for contamination resistance. As a ceramic insulator, it is classified under tariff item 8546.20.00.
8546.20.00Silicon Carbide Ceramic Surge Arrester Insulator
This silicon carbide ceramic surge arrester insulator houses SiC valve blocks for 132kV surge arresters in low-frequency grids, featuring pressure relief design. It provides non-linear voltage-current characteristics for lightning protection. As a ceramic insulator, it is classified under tariff item 8546.20.00.
8546.20.00Silicon Carbide Surge Arrester Insulator
A porcelain housing for silicon carbide surge arresters protecting transformers from lightning, with high puncture resistance. It provides electrical insulation and mechanical protection. This product falls under tariff item 8546.20.00 as a ceramic electrical insulator.
8546.20.00Silicon Carbide Surge Arrestor Insulators
Silicon carbide surge arrestor insulators are ceramic housings for gapless surge arrestors that protect transformers from lightning strikes up to 200kA. They are made of porcelain with high mechanical strength (12kN cantilever). These insulators are classified under tariff item 8546.20.00 as ceramic electrical insulators.
8546.20.00Steatite Ceramic Bushing Insulator
A steatite ceramic bushing used in switchgear to insulate conductors passing through enclosures, with threaded metal ends for mounting. It provides electrical insulation in medium-voltage applications. This product is classified under tariff item 8546.20.00 as a ceramic electrical insulator.
8546.20.00Steatite Ceramic Bushings
Steatite ceramic bushings are made from magnesium silicate and are used in low to medium voltage switchgear to insulate conductors through enclosure walls. They offer low electrical loss and high thermal stability up to 1000°C. These bushings are classified under tariff item 8546.20.00 as ceramic electrical insulators.
8546.20.00Steatite Ceramic Strain Insulator
This steatite-based ceramic insulator is designed for dead-end strain applications in low-frequency distribution lines up to 69kV, with high mechanical tensile strength. Its low-loss tangent makes it suitable for transformer bushings as well. As a ceramic insulator, it is classified under tariff item 8546.20.00.
8546.20.00Steatite Ceramic Terminal Block Insulator
A low-voltage steatite ceramic base for terminal blocks in control panels, isolating screw terminals. It prevents short circuits and provides electrical insulation. This product falls under tariff item 8546.20.00 as a ceramic electrical insulator.
8546.20.00Zirconia Ceramic Spark Plug Insulators
Zirconia ceramic spark plug insulators are high-strength insulators for automotive and industrial spark plugs, providing over 30kV dielectric strength and thermal shock resistance. The ceramic core insulates the central electrode from the metal shell. These insulators are classified under tariff item 8546.20.00 as ceramic electrical insulators.
8546.20.00Zirconia Ceramic Stand-Off Insulator
A high-strength zirconia ceramic stand-off insulator for mounting busbars in electrical panels, resistant to thermal shock. It provides electrical insulation and mechanical support. This product is classified under tariff item 8546.20.00 as a ceramic electrical insulator.
8546.20.00Zirconia-Toughened Alumina Insulator
This zirconia-toughened alumina (ZTA) ceramic insulator is designed for high-voltage circuit breakers in low-frequency power grids, offering fracture toughness over 5 MPa·m½. It is engineered for seismic-prone areas where mechanical resilience is critical. As a ceramic insulator, it is classified under tariff item 8546.20.00.
8546.90.00Alumina Ceramic Pin Insulator
High-purity alumina ceramic pin insulators designed for low to medium voltage distribution lines. These insulators prevent electrical conduction between conductors and supporting structures, and are made from a ceramic material.
8546.90.00Bakelite Electrical Spacer
Bakelite electrical spacers made from phenol formaldehyde resin, used to maintain distance between electrical busbars. These spacers provide insulation and mechanical support in electrical panels.
8546.90.00Cordierite Ceramic Insulator
Cordierite ceramic insulators with low thermal expansion, used in electrical heating appliances. These insulators withstand high temperatures and provide electrical insulation in demanding environments.
8546.90.00Epoxy Resin Bushings Insulator
Epoxy resin bushings used in transformers to insulate high-voltage conductors passing through the tank wall. These bushings are made from synthetic resin and provide electrical insulation and mechanical support.
8546.90.00Glass Fiber Reinforced Epoxy Tube
Filament-wound glass fiber epoxy tubes serving as high-strength electrical insulators for busbar supports. These tubes combine mechanical strength with electrical insulation properties.