15 kVA Three Phase Autotransformer, 230V to 400V

SKU: PH-T-ASG15KVA

$2,333.23

● 15 kVA three-phase autotransformer for 230V to 400V step-up industrial voltage conversion. ● Designed to supply compatible 400V machinery from an available 230V three-phase power source. ● Suitable for three-phase motors, pumps, fans, machine tools, control panels, and industrial automation equipment. ● Provides fixed step-up voltage matching for 400V industrial equipment without changing the supply frequency.

Winding Material *
Input Voltage (AC) *
Output Voltage (AC) *

Qty:

Ship to

Shipping Method

Name

Estimated Delivery

Price

No shipping options

⏱️ Delivery: 6-12 days

🔙 30-day Returns

Overview
Specs
Application
FAQ
Reviews

Overview

PowerHome's 15 kVA dry-type three-phase autotransformer provides reliable voltage adjustment for industrial AC power systems operating at 50Hz or 60Hz. Designed for step-down applications such as 230V to 400V, it also supports the common 380V to 220V/200V configuration as a standard option. With selectable copper or aluminum windings, the autotransformer can meet different performance and cost requirements. The transformer uses a robust, dry-type design with high-quality, insulated windings and a laminated silicon steel core, improving magnetic performance and reducing energy loss. This three-phase autotransformer is a practical solution for industrial machinery, electrical control cabinets, and power distribution systems that require stable voltage conversion between different three-phase power standards.

Feature

Flexible Voltage and Winding Options: Multiple input and output voltage configurations can be supported, and users may choose copper or aluminum windings depending on performance or budget requirements.
Durable Dry-Type Transformer Structure: This industrial dry-type autotransformer uses electromagnetic induction with insulated primary and secondary windings to ensure safe operation, stable voltage output, and simplified maintenance.
High-Quality Insulated Coil Design: Coils adopt H-class insulated enameled wire with tight and neat winding to prevent skipped turns. This helps reduce no-load current, minimize power loss, and improve overall efficiency.
Safe and Convenient Wiring Structure: Electrophoresis-treated clamps feature smooth edges and corrosion resistance, while tinned copper tube terminals and rail-type wiring ports simplify installation and enhance electrical reliability.

Details

Voltage Display Table
Starting Indicator Light
Wheel
Handle
Cooling Fan

15 kVA Three-phase Autotransformer Schematic Wiring Diagram

Three-phase autotransformer schematic wiring diagram

Specs

Phase	3-Phase
Rated Load Capacity	15 kVA
Input Voltage	AC 380V
Input Current	23A
Output Voltage (Optional)	AC 120V, 190V, 200V, 220V, 230V, 240V, 380V, 400V, 415V, 480V
Output Current	39A (220V); 43A (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	500×450×550 (mm)
Weight	65 kg

Application

CNC Equipment

Precision Instruments

Medical Devices

Automation Equipment

FAQ

Q1: What voltage configurations are available for this 15 kVA three-phase autotransformer?

The standard configuration steps down 3-phase 380V to 220V/200V. The 400V to 230V/220V configuration is also available, along with other input and output voltage combinations that can be customized to meet your specific project requirements. Please contact us with your voltage specifications before ordering.

Q2: What is F-class insulation, and why does it matter for an industrial autotransformer?

F-class insulation refers to a thermal classification that allows winding materials to withstand continuous operating temperatures up to 155°C. For a 15 kVA autotransformer used in heavy industrial applications, F-class insulation provides a meaningful safety margin over lower-rated classes, reducing the risk of insulation degradation under high-load or high-ambient-temperature conditions.

Q3: How do I choose between self-cooling and wind-cooled configurations?

Self-cooling relies on natural air convection and is suitable for standard industrial installations with adequate ventilation. Wind-cooled configurations use forced airflow to dissipate heat more efficiently and are recommended for high-duty-cycle operations, enclosed panel installations, or environments where ambient temperatures are elevated.

1 review(s)

Write your own review Close

Review title: *

Review text: *

Rating:

1 2 3 4 5

From: Peregrine | Date: 8/3/2026 1:18 AM

Heavy-Duty 15 kVA Transformer – Perfect Workhorse!

Bought this 15 kVA 3-phase autotransformer to step down 400V power for imported machinery in my shop. Runs super quiet (barely noticeable) and stays rock solid under heavy load. The heavy-duty wheels make moving this 140-lb unit effortless. Outstanding build quality!

15 kVA Three Phase Autotransformer, 230V to 400V

1 kVA Three Phase Autotransformer, 380V to 220V

5 kVA Three Phase Autotransformer, 480V to 240V

25 kVA Three Phase Autotransformer, 240V to 480V

30 kVA Three Phase Autotransformer, 480V to 380V

45 kVA Three Phase Autotransformer, 480V to 415V

75 kVA Three Phase Autotransformer, 480V to 400V