Pad-Mounted Single-Phase Transformer 25 kVA
A liquid dielectric transformer designed for underground distribution systems, rated at 25 kVA for residential power delivery. It uses mineral oil as the dielectric and steps down medium voltage to 120/240V single-phase. Classified under 8504.21.00 due to its power handling capacity not exceeding 650 kVA.
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More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If power handling exceeds 650 kVA
Transformers over 650 kVA capacity shift to subheading 8504.22 regardless of dielectric type.
If dry-type (air-cooled) construction
Dry dielectric transformers fall under 8504.31, excluding liquid-cooled designs.
If imported as parts like cores or coils
Separate transformer parts are classified under 8504.90, not complete assemblies.
Not sure which classification is right?
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
• Verify power rating certification (≤650 kVA) and dielectric type (liquid) via manufacturer specs to confirm 8504.21.00 classification
• Obtain NEMA standards compliance docs; common pitfall is misclassifying dry-type units
• Include test reports for oil insulation to avoid customs holds on safety grounds
Related Products under HTS 8504.21.00
Conventional Pole Transformer 37.5 kVA
37.5 kVA conventional mineral oil pole transformer, most common utility size. 7200/12470V primary. Standard 8504.21.00 product.
Pole-Mounted Distribution Transformer 50 kVA
Single-phase pole-mount transformer with mineral oil dielectric for utility pole installation, rated 50 kVA. Converts 7.2 kV to 120/240V for rural electrification. Fits 8504.21.00 as liquid dielectric unit under 650 kVA.
Residential Oil-Filled Transformer 100 kVA
Single-phase 100 kVA transformer with mineral oil immersion for suburban power distribution. Features dead-front design for safety. HTS 8504.21.00 applies to its sub-650 kVA liquid dielectric specs.
Distribution Class Transformer 45 kVA
Conventional mineral oil filled 45 kVA single-phase distribution transformer for pole mounting. Standard utility-grade with lightning arrestors. HTS 8504.21.00 for liquid type under capacity limit.
Self-Protected Transformer 25 kVA
25 kVA single-phase pole transformer with integrated bay-o-net fusing and mineral oil dielectric. Self-protected design reduces external protection needs. Classifies in 8504.21.00.
Loop-Feed Transformer 100 kVA
Dual-voltage 100 kVA single-phase transformer for loop-feed underground systems, oil-immersed. Allows radial or loop operation. Fits 8504.21.00 parameters.