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Used Power Transformers

  • Trusted Seller
    Hammond Power Solutions C1FC50LE 240X480V

    Hammond Power Solutions C1FC50LE 240X480V Transformer

    • Manufacturer: Hammond

    $150 USD
    Eaton Rapids, MI
  • North Hills,1117CC,Wideband Transformer

    North Hills,1117CC,Wideband Transformer

    • Manufacturer: North Hills

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $80 USD
    Galion, OH
  • Thordason,21F27,Filament Transformer

    Thordason,21F27,Filament Transformer

    • Manufacturer: Thordarson

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $36 USD
    Galion, OH
  • Square-D,9070-AAO-100,Transformer

    Square-D,9070-AAO-100,Transformer

    • Manufacturer: Square D

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $45 USD
    Galion, OH
  • Reliance Electric,65248-8S,Transformer

    Reliance Electric,65248-8S,Transformer

    • Manufacturer: Reliance Electric

    New unused with original box NOS. Please see pictures for details and condition. You will receive what’s in the pictures. If we have multiples of the same item, the pictures may differ. Please review the pictures...

    $40 USD
    Galion, OH
  • SYLVANIA,TR23-3,CONTROL TRANSFORMER

    SYLVANIA,TR23-3,CONTROL TRANSFORMER

    • Manufacturer: SYLVANIA

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $40 USD
    Galion, OH
  • BASLER ELECTRIC,BE22702001,TRANSFORMER

    BASLER ELECTRIC,BE22702001,TRANSFORMER

    • Manufacturer: Basler

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $20 USD
    Galion, OH
  • Reliance Electric,64977-80-R,Transformer

    Reliance Electric,64977-80-R,Transformer

    • Manufacturer: Reliance Electric

    New unused and with original box NOS. Please see pictures for details and condition. You will receive what’s in the pictures. If we have multiples of the same item, the pictures may differ. Please review the pict...

    $85 USD
    Galion, OH
  • GENERAL ELECTRIC,631X27,TRANSFORMER

    GENERAL ELECTRIC,631X27,TRANSFORMER

    • Manufacturer: GE

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $25 USD
    Galion, OH
  • Trusted Seller
    MO-5121, GE 9T23Q3474G03 K FACTOR

    MO-5121, GE 9T23Q3474G03 K FACTOR DRY TYPE TRANSFORMER. 75 KVA. 3 PH. 480V. 60HZ

    • Manufacturer: GE

    “Contact us directly for a freight quote or you can setup your own freight. Please provide ship to address. Loading is included with the sale of the item.”

    $1,250 USD
    Willoughby, OH
  • Trusted Seller
    MO-3618, GE 9T21B1028 G4 TRANSFORMER.

    MO-3618, GE 9T21B1028 G4 TRANSFORMER. 5 KVA. 3 PH. 60 HZ. 120/240 HV. 208 LV. QM

    • Manufacturer: GE

    “Contact us directly for a freight quote or you can setup your own freight. Please provide ship to address. Loading is included with the sale of the item.”

    $150 USD
    Willoughby, OH
  • Trusted Seller
    MO-3619, GE 9T21B1028 G4 TRANSFORMER.

    MO-3619, GE 9T21B1028 G4 TRANSFORMER. 5 KVA. 3 PH. 60 HZ. 120/240 HV. 208 LV. QM

    • Manufacturer: GE

    “Contact us directly for a freight quote or you can setup your own freight. Please provide ship to address. Loading is included with the sale of the item.”

    $150 USD
    Willoughby, OH
  • Trusted Seller
    MO-5125, GE 9T23Q3474G03 K FACTOR

    MO-5125, GE 9T23Q3474G03 K FACTOR DRY TYPE TRANSFORMER. 75 KVA. 3 PH. 480V. 60HZ

    • Manufacturer: GE

    “Contact us directly for a freight quote or you can setup your own freight. Please provide ship to address. Loading is included with the sale of the item.”

    $1,250 USD
    Willoughby, OH
  • RELIANCE ELECTRIC,64670-11S,TRANSFORMER NOS

    RELIANCE ELECTRIC,64670-11S,TRANSFORMER NOS

    • Manufacturer: Reliance Electric

    RELIANCE ELECTRIC,64670-11S,TRANSFORMER NOS What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be ...

    $60 USD
    Galion, OH
  • Trusted Seller
    Hammond Power Solutions – C3F009PBS

    Hammond Power Solutions – C3F009PBS Transformer 600V – 208Y/120V, 9kVA

    • Manufacturer: Hammond

    Hammond Power Solutions C3F009PBS transformer 600V to 208Y/120V, 9kVA. General purpose, used condition. Ideal for diverse electrical applications. Cat No. C3F009PBS 3PH, 9kVA, 60HZ QT TYPE Specification Table

    $1,250 USD
    Detroit, MI
1213141516

Overview

Power transformers transfer electrical energy between voltage levels for utilities, substations, and large industrial plants. These heavy, high-capacity units come in oil-filled or dry-type designs, with cooling classes (ONAN, ONAF, etc.), on-load tap changers, bushings and protection gear. Buyers must match voltage class, impedance, capacity (kVA/MVA), and cooling to system needs, and plan for foundation, handling, transport and commissioning.

FAQ

What specifications should I check when buying a used power transformer?

Confirm voltage ratios, kVA/MVA rating, impedance, cooling type, phase configuration, on-load tap changer condition, bushing types and insulation class, and recent test reports (DGA, insulation resistance, turns ratio).

How do I verify a used transformer's condition before purchase?

Request factory and maintenance records, Dissolved Gas Analysis (DGA), insulation resistance, power factor tests, sweep-frequency response (SFRA) and a visual inspection report for leaks, rust and bushing integrity.

What are the key shipping considerations for heavy power transformers?

Plan for specialized heavy-haul transport, load lifting equipment, route permits, weight/axle limits, skidding or cradling, draining oil if required by regulations, and coordination with local authorities for oversized loads.

What site preparations are needed before delivery and installation?

Prepare a level, rated foundation or skid with proper anchoring, ensure crane access and pad capacity, verify cable entry, grounding, oil containment for liquid-filled units, and arrange for qualified rigging and electrical commissioning crews.

What ongoing maintenance keeps a power transformer reliable?

Perform regular DGA, insulation resistance and oil quality tests, thermographic inspections, tap changer maintenance, bushing checks, cooling system inspections and timely repairs. Follow manufacturer intervals and keep detailed service records.