Custom Distribution Transformers - Southwest Electric

Southwest Electric Co. offers state-of-the-art distribution transformers built to your exact specifications, for every industry. For 75 years and counting, our mission remains to make your power our priority, with all products fully designed and built in the USA.



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  • Single phase 37.5-2,000 kVA
  • Three phase 75-7,500 kVA
  • 208-34,500 V primary & secondary
  • 50 & 60 Hz
  • 45-75°C Rise


  • UL and cUL Certified
  • IEEE C57.12.00, C57.12.90, C57.12.34
  • Department of Energy 10 CFR 431.193

UL CertifiedIEEE

Application Types

Substation Transformers

  • Primary and secondary bushings mounted on opposite ends, enclosed in either cabinets or flanges

Single Phase Pole-mounted Transformers

  • Round tank design
  • Cover-mounted bushings

Stand-alone Step-down Transformers

  • Customized to specific utility requirements
  • Integrated primary and/or secondary protection

Padmount Transformers

  • Custom orientations and enclosures

Special Applications

  • Extreme and corrosive environments (stainless steel construction, corrosion-resistant finishes)
  • VFD, high harmonics, and phase-shifting (high K factor)
  • Dual-primary and/or Dual-secondary
  • High-frequency designs

Design Features


  • Welded tank design with accessible lid
  • Anodized aluminum nameplate with vector diagrams
  • Externally-operated no-load tap changer
  • Drain valve with sampler (500 kVA and above)
  • Upper fill plug
  • Pressure relief device (automatic resetting type)
  • Liquid level gauge (750 kVA and above)
  • Liquid temperature gauge (750 kVA and above)
  • Type II mineral oil insulating fluid


  • SURE system (live oil sampling)
  • Natural ester insulating fluid
  • Dead-front bushings
  • Integrated or external fusing
  • Gland plate cutouts
  • Current and/or potential transformers
  • Surge arresters
  • DGA monitor
  • Pressure vacuum gauges
  • Gauges with electrical contacts and control box
  • Corrosion-resistant finishes
  • Custom paint colors
  • Winterized gasket package

Transformer Repair & Maintenance

In addition to designing and manufacturing new transformers, we also offer transformer repair, service, and testing – both in our shop and on location. Read more about our transformer field services.