25 kVA Three Phase Autotransformer, 240V to 410V/480V

SKU: PH-T-ASG25KVA

$2,884.31

● 3-phase dry-type autotransformer, 25 kVA rated capacity, 98% high efficiency. ● Standard configuration: input 380V, output 220V/200V; other voltages available for customization. ● Supports multiple voltage configurations to suit diverse application requirements. ● Copper or aluminum wire winding is selectable. ● Compatible with 50Hz and 60Hz AC power supply systems.

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Overview
Specs
Application
FAQ
Reviews

Overview

The 25 kVA dry-type three-phase autotransformer is engineered to provide efficient and reliable voltage conversion in AC power systems operating at 50Hz or 60Hz. With a flexible design supporting different voltage configurations such as 240V to 410V/480V, the unit can adapt to various industrial power requirements. The transformer adopts high-quality windings that can be manufactured using copper or aluminum conductors, allowing customers to balance performance and cost. Its dry-type construction ensures safe operation and simplified installation compared with oil-filled transformers. Thanks to its robust structure and efficient electromagnetic design, this industrial three-phase autotransformer is widely used as a voltage converter in manufacturing equipment, automation systems, and electrical distribution environments where stable three-phase power is required.

Feature

Multi-Voltage Conversion: The 25 kVA three-phase autotransformer supports various voltage configurations. While the standard setup is 380V to 220V/200V step-down, the transformer can also be configured for 240V to 410V/480V applications, providing flexible voltage transformation for industrial power systems.
High-Efficiency Transformer Design: With an efficiency of up to 98%, this dry-type industrial autotransformer helps minimize energy loss during voltage conversion, ensuring reliable and cost-effective operation in three-phase power environments.
Corrosion-Resistant Structural Components: Electrophoresis-treated clamps feature smooth edges and rounded corners, improving safety while enhancing corrosion resistance and structural durability.
Convenient and Reliable Wiring Terminals: Equipped with tinned copper tube terminals and rail-type wiring ports, the transformer allows convenient electrical connections while maintaining strong conductivity and enhanced overload capability.

Details

Voltage Display Table
Starting Indicator Light
Wheel
Handle
Cooling Fan

25 kVA Three-phase Autotransformer Schematic Wiring Diagram

Three-phase autotransformer schematic wiring diagram

Specs

Phase	3-Phase
Capacity	25 kVA
Input Voltage	AC 380V
Input Current	37A
Output Voltage (Optional)	AC 120V, 190V, 200V, 220V, 230V, 240V, 380V, 400V, 415V, 480V
Output Current	65A (220V); 70A (200V)
Frequency	50/60 Hz
Winding Material (Optional)	Aluminum Wire / Copper Wire
Cooling Method	Self-cooling / Wind-cooling
Working Efficiency	≥98%
Protection Grade	IP21
Waveform Distortion	No distortion (compared with the output wave)
Insulation Resistance	≥150MΩ
Wiring	Yn0
Electrical Strength	Power frequency sinusoidal voltage 3000V lasts for 1 minute, no breakdown or flicker
Overload Protection	Can withstand instantaneous 2 times the rated current
Moisture-proof Type (Optional)	Open Type / Sealed Type
Ambient Temperature	-20℃ ~ +45℃
Altitude	≤ 2500m
Relative Humidity	0-95%
Noise	≤35dB (within 1 meter)
Design Service Life	20 years
Use Environment	No explosion, rain, or snow corrosion place, and no gas or conductive dust in the medium that can corrode metal and damage insulation
Dimension	550×500×600 (mm)
Weight	85 kg

Application

CNC Equipment

Precision Instruments

Medical Devices

Automation Equipment

FAQ

Q1: What voltage configurations are supported by this 25 kVA three-phase autotransformer?

The standard configuration steps down a 3-phase 380V input to a 220V or 200V output, compatible with both 50Hz and 60Hz AC systems. Additional primary and secondary voltage combinations can be customized, making this dry-type autotransformer a flexible solution for diverse international industrial and commercial power supply requirements.

Q2: What makes this 25 kVA autotransformer achieve 98% efficiency?

The combination of H-class insulated enameled wire coils with low no-load current, a silicon steel sheet core with low magnetic loss, and tight skip-free winding all contribute to minimizing energy waste across the load range. Together, these design features enable this three-phase autotransformer to consistently achieve up to 98% conversion efficiency.

Q3: What cooling and winding material options are available for this three-phase autotransformer?

This 25 kVA dry-type autotransformer offers self-cooling or wind-cooled thermal management, and a choice of copper or aluminum wire windings — allowing buyers to configure the unit to match their specific performance needs, installation environment, and budget considerations.

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