Rectifier Transformers

Rectifier Transformers

Rectifier Transformer

Rectifier transformers are used for industrial processes which require direct current supply. These markets include DC traction, electrolysis, furnace operations, and large variable speed drives.


  • Power rating up to 3000 KVA
  • Up to 25 kV class, 125 kV BIL
  • Transformers drive 6, 12, 18, 24 and 36 pulse rectifiers
  • Multiple phase shifting options for 12 pulse and higher systems:
    • Delta/Wye
    • Extended delta for leading or lagging phase shift
  • For applications not requiring voltage transformation or isolation, auto wound phase shifting transformers (polygon, differential fork, etc.)
  • Three phase design
  • Frequency: 50 and 60 Hz standard – Inquire about other frequencies
  • Self-cooled, forced air cooled, or water-cooled construction
  • Aluminum or copper windings



  • UL Recognized insulation system (Primary must be 600V or less). MSI UL Insulation systems are available in 130°, 180° and 220°C ratings
  • CE marking with declaration of conformity ROHS and Low Voltage Directive where applicable
  • Private labeling with customer supplied nameplate artwork. Units that are private labeled cannot carry our UL label
  • NEMA 1 (indoor) or NEMA 3R (outdoor) enclosure with ANSI 61 gray powder coat finish
  • Temperature monitoring thermal switches, thermocouples, or platinum RTD’s
  • Final Test Reports with optional Certificate of Compliance


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