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Three Phase Autotransformers Series Three Phase Transformers
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Three Phase Autotransformers — Step-Up / Step-Down 380V
General-purpose three-phase autotransformers step voltage up or down with a single winding that serves as both primary and secondary, offering higher efficiency and smaller size than equivalent isolating transformers. Rated 1–500 kVA for 380V/220V/110V systems, used for voltage conversion, interconnection and step-up applications.
Key Features
- Single-winding autotransformer design for high efficiency
- Step-up or step-down voltage conversion
- 1–500 kVA, 380V/220V/110V systems
- Smaller and lighter than isolating transformers
- Low no-load loss and low copper loss
- Custom voltage ratios available
Applications
- Voltage conversion and interconnection
- Motor starting voltage adjustment
- Test and laboratory power
- 380V step-up/down applications
Selection Guide
Ratio
Confirm the input/output voltage ratio is moderate (autotransformers suit ratios near 1:1).
Capacity
Size to the continuous converted load.
- Frequently Asked Questions
What is a three-phase autotransformer?
An autotransformer uses a single winding for both primary and secondary, transferring part of the power conductively and part inductively — more efficient and compact than an isolating transformer for moderate voltage ratios.
How is it different from QZB starting autotransformers?
QZB autotransformers are dedicated to motor starting duty; general-purpose autotransformers serve continuous voltage conversion and interconnection.
Instant Selection & Quote Calculator
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| Base price (interpolation) | $18 |
| × Product factor | ×1.0000 |
| × Country factor | ×1.0000 |
| × Copper-linked factor | ×1.0000 |
| + Options / accessories | $0 |
Aluminum winding — no copper linkage
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