Series
AT3TH-UL — Three-Phase Auto-Transformer (UL-CSA, Boxed)
3 — 500 kVA · UL-CSA · IP44 metal box
UL-CSA listed three-phase auto-transformer pre-assembled in an approved IP44 steel enclosure. Lower cost and losses than isolation transformers where galvanic isolation is not required. Used for step-up/step-down voltage matching and reduced-voltage motor starting. UL E169331 / UL 5058.
Key Features
- ▸UL-listed up to 630 kVA
- ▸Pre-assembled IP44 metal box
- ▸Lower losses vs. isolation
- ▸Class H insulation
Insulation
Class H
IP Rating
IP44
Mounting
Floor-mounted, lifting eyes
METH Catalogue
Dimensions & data chart
Full dimensional drawing, code matrix, and electrical data (losses, efficiency, Ucc, inrush) for this series in the METH Transformer Catalogue — page 14.
View dimensional drawing & data chart (METH Catalogue p. 14) →Technical Data
Specifications
Inches shown as primary unit, mm as secondary where applicable. Custom voltages and ratings available — contact us for engineered configurations.
| Model | VA / kVA | Primary Voltage | Secondary Voltage | Certifications |
|---|---|---|---|---|
| AT3TH-UL-3 | 3 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
| AT3TH-UL-5 | 5 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
| AT3TH-UL-7.5 | 7.5 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
| AT3TH-UL-10 | 10 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
| AT3TH-UL-15 | 15 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
| AT3TH-UL-20 | 20 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
| AT3TH-UL-25 | 25 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
| AT3TH-UL-30 | 30 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
| AT3TH-UL-40 | 40 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
| AT3TH-UL-50 | 50 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
| AT3TH-UL-75 | 75 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
| AT3TH-UL-100 | 100 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
| AT3TH-UL-125 | 125 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
| AT3TH-UL-150 | 150 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
| AT3TH-UL-200 | 200 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
| AT3TH-UL-300 | 300 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
| AT3TH-UL-400 | 400 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
| AT3TH-UL-500 | 500 kVA | Per spec — 208 / 240 / 480 V common | Per spec | UL E169331 · UL 5058 · CSA |
Available from our Italian warehouse. Lead times and pricing on request.
Use Cases
Typical Applications
Voltage matching
208 V ↔ 240 V ↔ 480 V conversion for legacy or imported equipment.
Motor soft-start
Reduced-voltage starting for large three-phase motors.
Datacenter step-up
208 V → 240 V step-up for higher-density UPS / PDU layouts.
VFD ride-through
Buck/boost transformer on VFD inputs.
Get a Quote
Request a Quote — AT3TH-UL
Contact us for pricing, lead times, and application engineering. Full certification documentation provided with every order.