Hevi-Duty HT1F9AS 9KVA Dry-Type Transformer 480V Delta 208Y-120V 3PH 60Hz

Hevi-Duty HT1F9AS 9KVA Dry-Type Transformer 480V Delta 208Y-120V 3PH 60Hz

The Hevi-Duty HT1F9AS is a 9 KVA three-phase dry-type step-down transformer manufactured by EGS Electrical Group under the Hevi-Duty brand. It steps down a 480V Delta primary to a 208Y/120V secondary, making it a standard building-block for industrial and commercial power distribution where 480V service feeds equipment or panels requiring 208V three-phase or 120V single-phase circuits. This unit is RoHS 2002/95/EC compliant and carries both UL and CSA certifications.

Specifications & What's Included

• Catalog Number: HT1F9AS (also referenced as SOLHT1F9AS)
• Manufacturer: EGS Electrical Group / Hevi-Duty
• Power Rating: 9.0 KVA
• Primary Voltage: 480V Delta
• Secondary Voltage: 208Y / 120V
• Phase: Three Phase (3PH)
• Frequency: 60 Hz
• Insulation Class: Class H (180°C rated)
• Type: HT (dry-type)
• Enclosure: Rainproof Type 3R / Indoor Type 1 & 2
• Primary taps: 480V, 468V, 456V, 432V (multiple FCBN taps per nameplate wiring diagram)
• Secondary leads: X1, X2, X3 (208V lines), X0 (neutral)
• Lead wires: Carol brand, 600V rated, water-resistant, USA-made — present and intact
• Certifications: UL Listed (File 4207), CSA Certified (File LR14208)
• RoHS Compliant: Yes (2002/95/EC)
• Drive transformer application note per nameplate: APF 250#, S026410 EN 474
• Gray painted steel enclosure with mounting flanges

Applications

Dry-type transformers like the Hevi-Duty HT1F9AS are standard equipment in industrial facilities, commercial buildings, data centers, and manufacturing plants where 480V three-phase utility power needs to be converted to 208Y/120V for lighting panels, motor control centers, HVAC equipment, and general-purpose receptacle circuits. The 480V Delta to 208Y/120V wye configuration is one of the most common step-down arrangements in North American industrial electrical systems — 480V feeds the transformer, and the wye secondary simultaneously delivers 208V line-to-line (for three-phase loads) and 120V line-to-neutral (for single-phase loads). The Class H insulation rating (180°C) allows operation in higher-ambient environments without derating, and the Type 3R/Type 1 enclosure makes this unit suitable for both indoor and protected outdoor installations. The Hevi-Duty (EGS Electrical Group) product line has long been a preferred choice for OEM machine builders, electrical contractors, and facilities engineers in heavy industrial and process environments. Units in this KVA range are commonly used to power CNC machinery, conveyor systems, compressors, and panel boards in manufacturing settings, as well as variable-frequency drive (VFD) isolation applications — the nameplate explicitly references a drive transformer application.