Three-Phase Autotransformer
High-efficiency single-winding autotransformer for three-phase voltage conversion. More compact and economical than isolation transformers for non-isolated applications.
QUICK SPECIFICATIONS
Product Description
Three-phase autotransformers use a single shared winding per phase for both primary and secondary circuits, making them significantly more compact, lighter, and more efficient than equivalent two-winding isolation transformers. By transferring most of the power conductively rather than magnetically, autotransformers achieve efficiencies exceeding 98% — ideal for applications where electrical isolation is not required.
Our three-phase autotransformers are available from 1 kVA to 1000 kVA with common configurations including 480V to 240V, 600V to 480V, and 240V to 208V. Open-frame and enclosed (NEMA 1, 3R, 4X) versions are available. They are widely used as step-down or step-up transformers in industrial power distribution, motor starting applications, and voltage matching between utility supply and equipment requirements.
Key Features
- 0198%+ efficiency — minimal energy losses
- 0230-50% smaller and lighter than equivalent isolation units
- 03Available 1 kVA through 1000 kVA
- 04Open-frame and NEMA enclosed options
- 05Copper or aluminum windings
- 06Multiple voltage taps for field adjustment
Typical Applications
- check_circleIndustrial voltage step-down (600V to 480V, 480V to 240V)
- check_circleReduced-voltage motor starting (soft start)
- check_circleVoltage matching for imported equipment
- check_circleTemporary power and construction site distribution
- check_circleData center power conditioning