150 kVA Three Phase Dry-Type Isolation Power Transformer for 480V to 208Y120V Voltage Conversion

The 150 kVA three phase dry-type isolation transformer is a mid-to-high capacity industrial power transformer designed for reliable 480V to 208Y/120V voltage conversion, electrical isolation, and stable three-phase power distribution. This transformer is widely used in industrial, commercial, and infrastructure power systems where safety, efficiency, and long-term operational stability are critical.

As a dry-type isolation transformer, it features an oil-free construction, eliminating the risks associated with oil-filled transformers while reducing maintenance requirements. The 150kVA rating makes it an ideal solution for applications that exceed small transformer capacities but do not require large substation-level equipment, offering a balanced combination of power density, safety, and flexibility.

---

Technical Overview – 150kVA Dry-Type Isolation Transformer

The 150 kVA three phase isolation transformer is engineered to step down 480V three phase input power to 208Y/120V output, providing both voltage transformation and galvanic isolation. The grounded neutral secondary ensures compatibility with standard North American power distribution systems while protecting sensitive downstream equipment from electrical noise, harmonics, and transient disturbances.

Typical specifications include:

• Three phase dry-type isolation transformer design

• Step-down voltage conversion (480V to 208Y/120V)

• Air Natural (AN) cooling

• Class F or Class H insulation system

• Compliance with ANSI, IEEE, and IEC standards

Custom primary and secondary voltages, connection types, enclosures, and certifications are available for different regional requirements.

Technical Specifications – 150kVA Dry-Type Isolation Transformer

Item	Specification
Power Rating	150 kVA
Transformer Type	Three Phase Dry-Type Isolation Transformer
Voltage Function	Step-Down & Electrical Isolation
Primary Voltage (Standard)	480 V AC, Three Phase
Secondary Voltage (Standard)	208Y/120 V AC, Wye with Grounded Neutral
Optional Primary Voltages	380V, 400V, 415V, 440V, 460V
Optional Secondary Voltages	208V, 220V, 230V, 240V (customizable)
Phase	Three Phase
Frequency	50 / 60 Hz
Connection Type	Wye–Wye (standard), Delta–Wye or Delta–Delta optional
Cooling Method	Air Natural (AN), dry-type, oil-free
Insulation Class	Class F or Class H
Temperature Rise	80K / 100K
Enclosure	NEMA 1 indoor (NEMA 3R outdoor optional)
Standards	ANSI, IEEE, IEC, DOE efficiency compliant
Certifications	UL, cUL, CSA, CE, SGS (available upon request)
Installation	Indoor industrial electrical rooms
Customization	OEM / ODM / Private Label supported
Capacity Range	1 kVA – 5000 kVA

Working Principle & Electrical Isolation

The dry-type isolation transformer operates using electromagnetic induction between separate primary and secondary windings. Because there is no direct electrical connection between the input and output, the transformer provides complete electrical isolation, which is essential for protecting industrial equipment and personnel.

For industrial power conversion, the isolation function:

• Reduces ground loop issues

• Suppresses electrical noise and interference

• Improves overall power quality

• Enhances system safety and reliability

This makes the 150kVA unit suitable not only as a step-down transformer, but also as an isolation power transformer for sensitive and mission-critical loads.

---

Construction, Core & Materials

The 150 kVA three phase dry-type isolation transformer is built with high-quality laminated silicon steel cores that minimize core loss and vibration. Precision-wound copper or aluminum conductors ensure excellent current-carrying capability and thermal performance.

The advanced insulation system provides high dielectric strength and thermal endurance, supporting continuous operation under industrial load conditions. Compared with oil-immersed transformers, the dry-type design:

• Eliminates fire hazards

• Simplifies installation

• Reduces environmental impact

• Lowers long-term maintenance costs

---

Performance Advantages for Industrial Power Systems

This 150kVA industrial dry-type isolation transformer offers multiple advantages for power distribution and voltage conversion:

• Stable 480V to 208Y/120V step-down performance

• Reliable three-phase power output

• Improved power quality and voltage stability

• Safe, oil-free dry-type construction

• Long service life in industrial environments

Because of these advantages, the transformer is commonly specified as a three phase isolation transformer, industrial step-down transformer, or dry-type power transformer in engineering projects.

---

Typical Applications

The 150 kVA dry-type isolation transformer is widely used in:

• Industrial manufacturing facilities

• Electrical control panels and MCC rooms

• Data centers and server rooms

• HVAC systems and building services

• Automation and process control systems

• Commercial and institutional buildings

Its capacity makes it especially suitable for medium-scale industrial power distribution systems requiring stable and isolated 208Y/120V output.

---

Global Standards & International Compatibility

Designed to meet ANSI, IEEE, and IEC standards, this three phase dry-type isolation transformer supports installation in a wide range of global markets. It is commonly exported to and used in the United States, Canada, Brazil, Argentina, Australia, Indonesia, Malaysia, the Philippines, the United Arab Emirates, Saudi Arabia, Russia, Germany, France, South Africa, Venezuela, and other regions with different grid standards.

Voltage configurations, frequency options (50Hz / 60Hz), and enclosures can be customized to ensure compliance with local regulations and project requirements.

---

Project Case Study – Industrial Facility Power Upgrade

150kVA Dry-Type Isolation Transformer for 480V to 208Y/120V Conversion

A manufacturing plant required a reliable 150 kVA isolation transformer to convert 480V three phase utility power to 208Y/120V for new production equipment and control systems. Due to indoor installation and safety regulations, an oil-filled transformer was not acceptable.

The selected dry-type three phase isolation transformer was installed in the main electrical room and connected to multiple downstream panels. After commissioning, the system delivered stable voltage, reduced electrical noise, and improved operational reliability. The customer reported smoother equipment operation and simplified maintenance compared to their previous setup.

---

OEM, Customization & Supply Capability

As a China-leading dry-type isolation transformer manufacturer, supplier, wholesale exporter, and factory, we offer flexible OEM, ODM, and private label services. The product line covers a complete capacity range from 1 kVA to 5000 kVA, including single-phase and three-phase transformers.

Customization options include:

• Primary and secondary voltage combinations

• Connection types (Wye–Wye, Delta–Wye, Delta–Delta)

• Insulation class and temperature rise

• Enclosure types (NEMA 1, NEMA 3R)

• Certification and testing requirements

---

Frequently Asked Questions (FAQ)

Q1: Is this 150kVA transformer suitable for continuous operation?
Yes. The dry-type design with Class F or H insulation is engineered for continuous industrial duty.

Q2: Can the voltage be customized?
Yes. While 480V to 208Y/120V is standard, other voltage combinations are available upon request.

Q3: Is this transformer suitable for indoor installation?
Absolutely. The oil-free dry-type construction makes it ideal for indoor electrical rooms.

Q4: What capacity range do you support?
We manufacture dry-type isolation transformers from 1 kVA up to 5000 kVA.

---

Reliable Power Conversion for Global Industrial Projects

With its balanced capacity, robust construction, and flexible configuration options, the 150 kVA three phase dry-type isolation transformer is a dependable solution for industrial voltage conversion and power distribution. It provides safe electrical isolation, stable performance, and long-term reliability for global industrial power systems.

Request a Quote for Your Isolation Transformer Project

If you are planning an industrial power upgrade or sourcing a reliable solution for voltage conversion and electrical isolation, PowerNex is ready to support your project. We supply a full range of dry-type isolation transformers covering common and custom capacities, including 10 kVA, 15 kVA, 30 kVA, 40 kVA, 45 kVA, 75 kVA, 100 kVA, 150 kVA, 200 kVA, 300 kVA, 400 kVA, and up to 5000 kVA, available in both single-phase and three-phase configurations.

Whether you require a step-down isolation transformer, step-up isolation transformer, or a customized dry-type power transformer, our engineering team can tailor voltage ratings, connections, enclosures, insulation classes, and certifications to match your local standards and application requirements. From small control systems to large industrial power distribution projects, we provide dependable solutions with consistent quality and global supply capability.

Contact PowerNex today to request technical support, drawings, or a competitive quotation, and discover how our dry-type isolation transformers can deliver safe, efficient, and long-term power solutions for your industrial and commercial applications worldwide.