Energy Transformer 75 kVA 480V Delta to 480Y/277V Isolation Transformer

75 kVA 480V Delta Primary to 480Y/277V Secondary Isolation Transformer

Power Rating: 75 kVA (30–2000 kVA available)
Primary Voltage: 480V (Delta connection)
Secondary Voltage: 480Y/277V (Wye, grounded neutral)
Connection Options:Delta – Grounded Wye (standard)，Wye – Wye，Delta – Delta，Wye – Delta
Phase: Three-phase, 50/60 Hz
Cooling Type: Dry type (ventilated or cast resin), air-cooled (AN/AF)
Standards Compliance: ANSI C57.12, IEEE C57.12.91, DOE 2016 efficiency standards, NEMA ST-20, CSA C2.1
Certifications: UL Listed (UL 1562), CSA, CE, SGS, RoHS compliant
Enclosure: Ventilated dry type or cast resin insulated; NEMA 1 for indoor or NEMA 3R for outdoor applications; optional IP23 protection available
Applications: Designed for reliable power distribution in commercial buildings, industrial plants, hospitals, schools, data centers, and renewable energy projects across North America. Suitable for equipment isolation, harmonic reduction, and sensitive load protection.

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Safeguard Your Operations with the Ultimate 3 Phase Isolation Transformer

In today's industrial and commercial landscape, unstable power is not just an inconvenience—it's a threat to your productivity, equipment, and bottom line. Voltage spikes, electrical noise, and ground loops can wreak havoc on sensitive machinery, data centers, and critical infrastructure. The 75 kVA 3 Phase Isolation Transformer from Energy Transformer is engineered to be your first line of defense, providing a robust solution for clean, reliable, and safe power.

This meticulously designed dry type isolation transformer converts a 480V Delta input to a stable 480Y/277V output, a configuration widely used throughout the United States, Canada, and North America. By creating true galvanic isolation, this unit not only ensures voltage conversion but also protects your valuable assets from the most common power disturbances.

At Energy Transformer, we don't just build transformers—we build trust. With our commitment to factory-direct quality, certified compliance (UL, CSA, CE), and tailored solutions, we are the go-to partner for companies seeking dependable isolation transformers.

What Makes a 75 kVA Isolation Transformer Essential?

A 75 kVA transformer serves as a vital bridge in power distribution, offering distinct advantages that a standard transformer cannot. Its core function is to physically and electrically separate the primary and secondary circuits.

Superior Noise Reduction: The isolation windings act as a filter, blocking high-frequency electrical noise and harmonics generated by modern electronic equipment. This is critical for data centers, hospitals, and any facility with sensitive IT gear.
Enhanced Safety and Grounding: By providing a new, isolated neutral-to-ground reference, our 3 phase isolation transformer prevents dangerous ground loops and touch voltages. This protects both your personnel and your equipment.
Stable Voltage Conversion: It flawlessly steps down and converts the 480V Delta power to a dual 480Y/277V output, providing 277V for lighting and single-phase loads, and 480V for three-phase equipment.
Long-Term Efficiency: Designed with high-quality core steel and pure copper windings, our transformers minimize energy loss, leading to lower operating costs and a reduced carbon footprint over the product's lifespan.

Learn More：75 kVA Single Phase Pole Mounted Distribution Transformer 13.2 kV - 120/240 V

Technical Excellence and Design

Every Energy Transformer is built to exacting standards, ensuring it performs flawlessly in demanding environments.

Parameter	Value
Rated Power	75 kVA
Primary Voltage	480V Delta (3-Phase, 3-Wire)
Secondary Voltage	480Y/277V Wye (3-Phase, 4-Wire)
Frequency	50/60 Hz
Winding Material	High-Conductivity Copper (Aluminum available)
Insulation Class	Class H (180°C) with a max. 150°C rise
Enclosure	NEMA 1 (Indoor) or NEMA 3R (Outdoor)
Impedance	5% (Customizable)
Efficiency	≥ 98% (meets DOE standards)
Cooling Method	Dry-Type, Natural Air (AN)
Noise Level	< 55 dB (at 1 meter, quieter than a typical conversation)
Certifications	UL Listed, CSA Certified, CE, IEEE, IEC

Energy Transformer 75 kVA 3-phase dry-type isolation transformer Image of a NEMA 3R enclosed 75 kVA dry-type transformer Energy Transformer 480V Delta to 480Y/277V isolation transformer

Energy Transformer 75 kVA 3-phase dry-type isolation transformer Image of a customized 75 kVA transformer unit Custom-made dry-type transformer for industrial applications

Factory outer packaging for a 75 kVA 3 phase isolation transformer, ready for shipment to the US or Europe

Experience the Energy Transformer Advantage:

Unmatched Durability: Our transformers feature robust core steel and a protective enclosure designed to withstand harsh industrial conditions.
Flexible Deployment: Choose between our NEMA 1 (indoor) and rugged NEMA 3R (outdoor) enclosures to fit any installation requirement.
Guaranteed Compliance: With UL Listed and CSA Certified approval, our 75 kVA transformer is guaranteed to meet the most stringent safety and performance standards in the North American market.

Industries and Applications

The versatility of this 3 phase isolation transformer makes it indispensable across a wide range of sectors:

Commercial Real Estate: Powering HVAC systems, elevators, and lighting, ensuring energy efficiency and stable operation.
Industrial Manufacturing: Providing isolated power for sensitive machinery like CNC machines, robotics, and automated production lines.
Data Centers & Telecom: Protecting mission-critical servers, networking equipment, and power backup systems from electrical noise and voltage fluctuations.
Healthcare Facilities: Supplying clean, reliable power for sensitive medical imaging devices, life support systems, and laboratory equipment.
Renewable Energy: Used in solar and wind power systems to provide grid-safe voltage conversion.

Why Partner with Energy Transformer?

As a leading Chinese transformer manufacturer, Energy Transformer stands out through our commitment to quality, value, and customer satisfaction.

Direct from the Factory: We operate a state-of-the-art manufacturing facility that handles everything from silicon steel cutting to full-load testing. By going factory-direct, we eliminate middlemen and pass the savings on to you.
Global Certifications: Our products are rigorously tested and certified to international standards, giving you peace of mind whether your project is in the USA, Canada, UK, Germany, or Australia.
Customization Experts: Need a unique configuration? Our engineering team can design and produce custom isolation transformers to match your exact voltage, kVA rating, and enclosure specifications. We specialize in solutions from 6 kVA all the way up to 500 kVA.
Proven Global Reach: With a history of supplying to over 30 countries, our reputation for delivering high-performance transformers is well-established and trusted worldwide.

Frequently Asked Questions (FAQ)

Q1: What is the main difference between an isolation transformer and an autotransformer? A: The key difference is safety and isolation. An isolation transformer has separate primary and secondary windings, providing galvanic isolation to protect against surges and electrical noise. An autotransformer shares a common winding and does not offer this vital isolation.

Q2: Can this 75 kVA transformer be used outdoors? A: Yes. While the standard unit comes in a NEMA 1 indoor enclosure, we offer a weatherproof NEMA 3R enclosure specifically for safe outdoor use.

Q3: How do you ensure the transformer meets North American electrical standards? A: Our 75 kVA 3 phase isolation transformer is UL Listed and CSA Certified, guaranteeing full compliance with the strict safety and performance regulations in the U.S. and Canada.

Q4: Can I order a customized voltage or kVA rating? A: Absolutely. Our manufacturing flexibility allows us to create custom designs tailored to your specific voltage, kVA, and other application requirements.

Ready to Upgrade Your Power System?

Don't compromise on the safety and efficiency of your operations. Choose the Energy Transformer 75 kVA isolation transformer for a reliable, certified, and cost-effective power solution.