HS Code for Dry-type transformer

The classification of electrical transformers under HS code 850432 is determined by two primary technical factors: the cooling medium and the power handling capacity. Chapter 85 covers electrical machinery and equipment. Heading 8504 is reserved for electrical transformers, static converters, and inductors. Within this heading, transformers are first divided into liquid-dielectric (oil-filled) and "other" (dry-type). Subheading 850432 specifically addresses dry-type transformers that have a power handling capacity exceeding 1 kVA but not exceeding 16 kVA. These units are typically used in industrial control systems, medical equipment, and small-scale power distribution where the fire risk associated with oil-filled units must be avoided. The classification ensures that medium-capacity dry units are distinguished from both smaller electronic transformers and larger industrial power transformers. The "dry-type" designation refers to the fact that the core and coils are not immersed in a liquid sealant or coolant, but are instead cooled by air or solid insulation.

Products Included

• Dry-type isolation transformers (1.1 kVA to 16 kVA)
• Industrial control transformers within the specified power range
• Step-up or step-down dry transformers for machinery
• Air-cooled power transformers for indoor use
• Encapsulated dry-type transformers

Common Misclassification

The most frequent misclassification occurs with HS code 850421, which is for liquid-dielectric transformers. Even if the power capacity is the same, the cooling medium is the primary separator at the 4-digit level. Another common error involves capacity thresholds: transformers with a capacity of 1 kVA or less fall under 850431, while those exceeding 16 kVA but not exceeding 500 kVA fall under 850433. Misidentifying the kVA rating can lead to significant customs delays. Furthermore, if the device is a static converter (like a rectifier or inverter) rather than a transformer, it must be classified under 850440.

FAQ

What is the HS code for dry-type transformer?

For a dry-type transformer with a power handling capacity between 1 kVA and 16 kVA, the correct HS code is 850432.

How do I distinguish between 850431 and 850432?

The distinction is based solely on power capacity. If the transformer handles 1 kVA or less, use 850431. If it handles more than 1 kVA (up to 16 kVA), use 850432.