HS Code for Distribution transformer

Distribution transformers are classified under HS code 8504.21 because they are electrical transformers utilizing a liquid dielectric (typically oil) for cooling and insulation, with a power handling capacity not exceeding 650 kVA. This classification is determined by General Interpretative Rules (GIR) 1 and 6, following the specific subheadings for liquid dielectric transformers. These units are essential for stepping down voltage from primary distribution lines to levels suitable for residential or commercial use. The classification depends strictly on the cooling medium and the kVA rating. The liquid dielectric serves two purposes: providing electrical insulation between internal components and dissipating heat generated during operation. Under the Harmonized System, heading 8504 covers electrical transformers, static converters, and inductors, and the subheadings are divided based on whether the transformer uses a liquid dielectric or another medium like air or cast resin.

Products Included

• Pole-mounted distribution transformers
• Pad-mounted liquid-filled transformers
• Single-phase liquid dielectric transformers
• Three-phase liquid dielectric transformers under 650 kVA

Common Misclassification

These are often confused with HS code 8504.31, which covers dry-type transformers (non-liquid dielectric). They are also frequently misclassified under 8504.22 if the power handling capacity exceeds 650 kVA but is below 10,000 kVA. It is critical to verify the kVA rating and the cooling medium before assigning the code.

FAQ

What is the HS code for distribution transformer?

The HS code for a liquid dielectric distribution transformer with a capacity not exceeding 650 kVA is 8504.21.

Does the type of oil used affect the HS code?

No, as long as the transformer uses a liquid dielectric (mineral oil, silicone, or vegetable oil), it remains under the liquid dielectric subheadings of 8504.