40 kVA Dry-Type Ventilation Transformer
Dry-type transformer rated 40 kVA, 480V delta primary to 208Y/120V secondary, with NEMA 3R enclosure for HVAC and ventilation systems in commercial buildings. Lacks liquid insulation, using epoxy-resin windings for fire safety, classified in HTS 8504.33.0020 for its mid-range power capacity. Meets UL 1561 standards for indoor/outdoor use.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If capacity exceeds 50 kVA but ≤500 kVA
Same category but higher power band within the 8504.33 structure.
If integral to HVAC fan or blower assembly
Transformers embedded in complete fans classified by end-use apparatus.
If functions primarily as inductor rather than voltage transformer
Pure inductors or chokes without step-up/down voltage change go to inductors heading.
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Import Tips & Compliance
• UL 1561 listing mandatory; provide temperature rise test data (e.g
• 150°C rise)
• Declare insulation class (Class H) and K-factor rating for nonlinear loads
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