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Three Phase Transformers
9 Series · 97 Models
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Three Phase Transformers Overview
Three-phase dry-type transformers step down, isolate, or adapt three-phase supply for industrial systems and imported equipment without insulating oil, making them fire-safe for indoor installation. QDTB units range from 150 VA to 600 kVA with input voltages up to 1000 V at 50/60 Hz. Product lines SG, SSG, SG10, ZSG, QZB, SGK, and USG span isolation transformers, rectifier transformers, and three-phase auto-transformers, built with high-grade silicon steel cores and pure copper windings for reduced losses and higher efficiency.
Available Series
SG Series
The SG series three-phase dry-type transformers are designed for industrial power distribution applications. Cast resin or open-type construction for indoor use.
SSG Series
The SSG series three-phase servo isolation transformers provide galvanic isolation and voltage matching for servo drive systems and sensitive electronic equipment.
SG10 Series
The SG10 series non-encapsulated dry-type transformers use Nomex insulation system, offering excellent fire resistance and environmental performance.
ZSG Series
The ZSG series three-phase rectifier transformers are designed for rectifier power supply systems, electroplating, and DC power applications.
QZB Series
The QZB series self-coupling voltage reducing starters provide soft-start capability for large three-phase induction motors, reducing inrush current.
SGK Series
SGK three-phase isolation transformers provide galvanic isolation for industrial equipment, 5-50 kVA with custom secondary voltages.
USG Series
USG three-phase transformers step down 380 V to 220 V for machinery and distribution. 3.5-180 kVA, balanced three-phase output.
Three Phase Autotransformers Series
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.
Oil-Immersed Isolation Transformers Series
Oil-immersed three-phase isolation and rectifier transformers provide galvanic isolation between the supply and load with oil-immersed cooling for higher ratings and outdoor duty. Rated 10–2500 kVA, 6/10/35 kV primary, for rectifier, isolation and power-conversion applications requiring robust oil-immersed construction.
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| Base price (interpolation) | $18 |
| × Product factor | ×1.0000 |
| × Country factor | ×1.0000 |
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| + Options / accessories | $0 |
Aluminum winding — no copper linkage
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Application Scenarios
Imported Equipment
Adapts imported machines to local three-phase voltages, avoiding costly rewinding or replacement.
Power Isolation
Three-phase isolation to suppress harmonics, transients and noise for sensitive industrial loads.
Rectifier Systems
Feeds rectifier bridges and DC drives with dedicated three-phase secondary windings.
Industrial Machinery
Steps down or isolates supply for production lines, injection moulding and packaging equipment.
Elevators & Cranes
Handles high starting currents of hoists and elevators with robust winding construction.
Testing & Laboratories
Adjustable three-phase output for product testing, motor run-in and R&D benches.
Technical Advantages
Dry-Type Safety
No insulating oil, fire-safe and suitable for indoor installation near people and equipment.
Pure Copper Windings
Full copper windings reduce losses and improve thermal performance over aluminium.
Multiple Configurations
Isolation, auto-transformer and rectifier variants from a single product family.
Low-Loss Core
High-grade silicon steel keeps no-load loss low and efficiency high.
FAQ - Three Phase Transformers
What is the difference between an isolation transformer and an auto-transformer?
What does delta-star (Dyn11) connection mean?
How do I choose the kVA rating?
What is the difference between single-phase and three-phase transformers?
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