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Home > Electrical & Electronics > Passive Components > Capacitor > 15-40kVA Three-Phase Dry Type Isolation Transformer 660V to 400V/380V/220V With Mill Test Report

15-40kVA Three-Phase Dry Type Isolation Transformer 660V to 400V/380V/220V With Mill Test Report

15-40kVA Three-Phase Dry Type Isolation Transformer 660V to 400V/380V/220V With Mill Test Report thumbnail-3

15-40kVA Three-Phase Dry Type Isolation Transformer 660V to 400V/380V/220V With Mill Test Report thumbnail-4

15-40kVA Three-Phase Dry Type Isolation Transformer 660V to 400V/380V/220V With Mill Test Report thumbnail-5

15-40kVA Three-Phase Dry Type Isolation Transformer 660V to 400V/380V/220V With Mill Test Report photo-1

15-40kVA Three-Phase Dry Type Isolation Transformer 660V to 400V/380V/220V With Mill Test Report photo-2

15-40kVA Three-Phase Dry Type Isolation Transformer 660V to 400V/380V/220V With Mill Test Report photo-3

15-40kVA Three-Phase Dry Type Isolation Transformer 660V to 400V/380V/220V With Mill Test Report photo-4

15-40kVA Three-Phase Dry Type Isolation Transformer 660V to 400V/380V/220V With Mill Test Report photo-5

Product Spotlights

Designed for safe and efficient 660V to 400V/380V/220V step-down conversion, this dry-type isolation transformer features robust Class H insulation, eliminates fire risks from oil, and includes a Mill Test Report for quality verification. Ideal for protecting sensitive industrial equipment, it offers high efficiency, flexible configurations, and reliable performance backed by manufacturer certifications.

US$ 159 ≥1 Unit

Key Specifications

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Transformer Type:

Dry Type, Isolation

Rated Power Capacity:

15 kVA to 40 kVA

Primary Voltage:

660V, Three-Phase

Contact Supplier Request Quote Chat Now

Jinhua Dika Electrical Equipment Co., Ltd.

1Yr

Payment & Shipping

Payment Methods:

Port of Shipment:

China

Delivery Detail:

Delivery time depends on order quantity.

Product Details
Company Profile
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Transformer Type Dry Type, Isolation

Rated Power Capacity 15 kVA to 40 kVA

Primary Voltage 660V, Three-Phase

Secondary Voltage 400V/380V/220V, Three-Phase

Insulation Class Class H (Up to 180°C)

Cooling Method AN/AF (Air Natural/Air Forced)

Mounting Type Floor Mounting

Protection Degree IP00, IP20, IP23 (Optional)

Standards Compliance IEC 60076, ANSI/IEEE C57.12.01

Documentation Mill Test Report Included

As a professional manufacturer with over a decade of experience, Jinhua Dika Electrical Equipment Co., Ltd. specializes in producing high-quality, reliable power distribution solutions. Our 15-40kVA Three-Phase Dry Type Isolation Transformer is engineered to provide safe, stable, and efficient voltage conversion for industrial and commercial applications worldwide. With a commitment to quality certified by ISO 9001 and other stringent management systems, we deliver transformers that ensure operational continuity and protect sensitive equipment from voltage fluctuations and electrical noise.

This transformer series is designed to step down a 660V three-phase supply to standardized lower voltages of 400V, 380V, or 220V, making it an ideal solution for integrating machinery and equipment into diverse electrical grids. The dry-type, air-cooled design eliminates fire and environmental hazards associated with liquid-filled transformers, offering a safer and more maintenance-friendly option for indoor installations.

Core Product Features & Technical Advantages:

Enhanced Safety & Isolation: The isolation design provides galvanic separation between the primary and secondary circuits. This effectively suppresses common-mode noise, protects against ground loops, and enhances personnel safety by isolating the load from the source.
Robust Dry-Type Construction: Utilizing high-grade silicon steel cores and copper or aluminum windings with Class H insulation, these transformers are built for durability and long service life. They are self-extinguishing and do not require oil containment, simplifying installation and reducing fire risk.
High Efficiency & Low Losses: Optimized magnetic circuit design and high-quality materials contribute to low no-load and load losses, resulting in improved energy efficiency and reduced operating costs over the transformer's lifetime.
Flexible Voltage Configuration: The secondary side can be configured to output 400V, 380V, or 220V three-phase, providing adaptability for various regional standards and specific equipment voltage requirements.
Comprehensive Quality Assurance: Each unit is supplied with a detailed Mill Test Report (MTR), documenting raw material grades, factory test results (including resistance, ratio, and insulation tests), and verifying compliance with specified standards.

Detailed Technical Specifications:

Parameter	Specification
Rated Power (kVA)	15, 20, 25, 30, 37.5, 40
Primary Voltage	660V AC, 3-Phase, 50/60 Hz
Secondary Voltage	400V / 380V / 220V AC, 3-Phase, 50/60 Hz
Vector Group	Dyn11, Yyn0, or as requested
Insulation Class	Class H (180°C)
Cooling Class	AN/AF
Impulse Withstand Level	Customizable based on application
Noise Level	<55 dB(A) typical at 1 meter
Terminations	Copper busbars or cable boxes (optional)
Enclosure	Open frame (IP00) or enclosed with louvers/fans (IP20, IP23 optional)

Application Scenarios & Benefits for Clients:

Industrial Manufacturing: Provides clean, isolated power for CNC machines, PLCs, robotic arms, and variable frequency drives (VFDs), preventing malfunctions and extending equipment lifespan.
Commercial Buildings & Data Centers: Safely steps down voltage for lighting, HVAC systems, and server racks, ensuring power quality and system reliability.
Renewable Energy Integration: Can be used in solar or wind farm substations to interface inverter outputs with the local distribution grid.
International Equipment Deployment: Allows machinery designed for 400V/380V markets to operate safely on 660V supply networks, facilitating global projects.
Cost Savings: The dry-type design reduces maintenance costs, eliminates oil testing/disposal, and its high efficiency lowers electricity bills. The long operational life provides a strong return on investment.

Trust is paramount in B2B transactions. Jinhua Dika operates a fully integrated manufacturing facility with 11-50 skilled employees, ensuring direct quality control from core assembly to final testing. Our commitment is validated by a comprehensive suite of certifications, including ISO 9001 for quality management and ISO 14000 for environmental stewardship. With an annual export value ranging between US$1 Million and US$5 Million, our products are proven in demanding markets across North America, Europe, Southeast Asia, and beyond, shipped reliably from major ports like Shanghai and Ningbo. Choosing our transformer means partnering with a certified manufacturer that provides documented quality (MTR) and robust after-sales support. Contact us today to discuss your specific 660V to 400V/380V/220V power conversion needs and receive a detailed proposal.

Frequently Asked Questions (FAQ):

Q: What is the main advantage of a dry-type transformer over an oil-filled one for my factory?
A: Dry-type transformers use air as the cooling and insulating medium, eliminating risks of oil leaks, fires, or environmental contamination. They are ideal for indoor installations, require less maintenance, and often have a smaller footprint.
Q: Can this transformer handle frequent load fluctuations or harmonic loads from VFDs?
A: Yes, our transformers are designed with robust construction and can be specified with appropriate derating or K-factor ratings to handle non-linear loads and harmonics commonly generated by modern industrial electronics.
Q: Is the Mill Test Report provided for each individual unit or just per batch?
A: We provide a comprehensive Mill Test Report for each individual transformer, detailing the specific test results and material certifications for that unit, ensuring full traceability.
Q: What are the typical delivery lead times for an order of 5 units of 30kVA transformers?
A: Lead times vary based on order volume and configuration. For standard models, production typically takes 3-4 weeks after order confirmation. We provide accurate timelines upon quotation.
Q: Do you offer custom voltage ratios or special enclosures for harsh environments?
A: Absolutely. As a manufacturer, we offer customization options including different voltage ratios, higher IP protection grades (e.g., IP54 for dust and water resistance), and special coatings for corrosive atmospheres.
Q: What kind of warranty do you provide with your transformers?
A: Our standard warranty period is one year from the date of shipment, covering defects in materials and workmanship under normal operating conditions. Extended warranty options are available.
Q: How do I determine the correct kVA rating needed for my application?
A: The required kVA depends on the total connected load and its characteristics. We recommend providing us with your load list, including motor starting currents if applicable. Our technical team can then assist in sizing the optimal transformer.
Q: Are your transformers suitable for 60Hz power systems, such as those in North America?
A: Yes, our transformers are designed to operate at both 50Hz and 60Hz frequencies. The design will be adjusted accordingly based on your specified system frequency to ensure optimal performance.