General Purpose Transformers

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

  • Either step-up or step-down,
  • 1-Phase and 3-Phase,
  • Multiple primary or secondary voltages accomodated,
  • Available open frame or in a NEMA rated enclosure,
  • With or without circuit protection.
  • Can also include line filter, GFI, EMO switch, indicator lamps, etc.

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

Build configurations and capabilities

Electrical Characteristics

50VA up to 1.5MVA

1-Phase, 3-Phase

50Hz and/or 60Hz, 400Hz up to 20,000Hz

Up to 600Vrms input

Up to 600Vrms output

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

Examples of General Purpose Transformers


15kVA transformer

3-Phase, 60Hz

Primary = 180Vrms - 480Vrms taps

Secondary 1 = 208Vrms @ 15Arms

Secondary 2 = 208Vrms @ 15Arms

Secondary 3 = 208Vrms @ 15Arms

Secondary 4 = 120Vrms @ 15Arms


18.5kVA transformer

3-Phase, 50/60Hz

Primary = 480Vrms

Secondary + 65-33Vrms @ 18.5kVA

Multi-tap secondary

Copper buss secondary

NRTL to UL 1561


500kVA transformer

3-Phase, 50/60Hz

Primary = 300Vrms L-L

Secondary = 480Vrms L-L @ 500kVA

NEMA1 enclosure

Coil temperature monitor w/alarm


150kVA transformer

3-Phase, 50/60Hz

Primary = 440Vrms

Secondary = 480Vrms @ 180Arms

NEMA1 enclosure

Pri/sec circuit breakers


225kVA transformer

3-Phase, 50/60Hz

Primary = 480Vrms delta

Secondary = 340 - 520Vrms wye

NEMA1 enclosure w/doors


400kVA transformer

3-Phase, 50/60Hz

Primary = 400/440/480Vrms

Secondary = 400/230Vrms