Phase-Shift Transformers

Designed in a collaborative effort between your staff and ours, designs are available in:

  • Customizable phase-shift options,
  • Harmonic mitigation,
  • Low Inrush,
  • Multiple primary or secondary voltages accomodated,
  • Available open frame or in a NEMA rated enclosure,
  • With or without circuit protection.

Order Now

All of our units are built-to-order, in either production-run or prototype quantities. Contact us with your specifications and we’ll get a design and quote the unit. If you don't know everything, we can help. Call us at US +1 408-263-8444, or email us by clicking the button below:

ISO 9001:2015 icon These transformer are NRTL to UL 506 and 1561. Find out more about our certifications by clicking here: More on certifications
Phase shift transformer open frame

Build configurations and capabilities

Electrical Characteristics

Phase Shift = 15o, 30o, 45o

Power rating = 50VA up to 1.5MVA

Phases = 3

Frequency = 50/60Hz

Voltages = Up to 30kVrms

NRTL to UL 506 or 1561

Terminal Configurations

Copper buss bar

Silicon bronze hardware

Terminal strip

Ring-lug compatibility

Touch-safe configurations

Lexan covers


Enclosures and weather

NEMA enclosures

NEMA 1: General purpose

NEMA 3: Weather-resistant (falling dirt, windblown dust, rain, sleet, snow, formation of ice)

NEMA 3R: Same as 3, omits protection against windblown dust

NEMA 4: Watertight

NEMA 4X: Same as 4, but stainless steel

NEMA 6: Submersible



Circuit breakers

EMO switches


Examples of Phase-Shift Transformers


750kVA Phase Shift Transformer

3-Phase, 60Hz

Primary = 4,160Vrms L-L Delta

Secondary = 480Vrms L-L at 451Arms

Phase shifted = 30o

NEMA1 enclosure

NRTL to UL 1561, CE Mark


185kVA Phase Shift Transformer

3-Phase, 50/60Hz

Primary = 460/470/480/490/550Vrms L-L Delta

Secondary = 208/120Vrms @ 185kVA

Circuit protection

NEMA1 enclosure

NRTL to UL 1561, 508A, CE Mark