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Used Square D Power Transformers

  • 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
  • Square D,9070 EO-3,Industrial Control Transformer

    Square D,9070 EO-3,Industrial Control 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 ...

    $32 USD
    Galion, OH
  • Square D,9070T5200D1,Industrial Control Transformer

    Square D,9070T5200D1,Industrial Control 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 ...

    $20 USD
    Galion, OH
  • SQUARE D,9070V800D35,TRANSFORMER 800KVA

    SQUARE D,9070V800D35,TRANSFORMER 800KVA

    • Manufacturer: Square D

    Used in good condition. 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 to make s...

    $300 USD
    Galion, OH
  • SQUARE D,9070T50D1,CONTROL TRANSFORMER 0.05KVA

    SQUARE D,9070T50D1,CONTROL TRANSFORMER 0.05KVA

    • 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 ...

    $15 USD
    Galion, OH
  • Square D,EO-2,Transformer Class 9070

    Square D,EO-2,Transformer Class 9070

    • 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 ...

    $16 USD
    Galion, OH
  • SQUARE D,9070-EO4,TRANSFORMER 300VA

    SQUARE D,9070-EO4,TRANSFORMER 300VA

    • 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 ...

    $85 USD
    Galion, OH
  • SQUARE D,9070K75D1,INDUSTRIAL CONTROL TRANSFORMER NOS

    SQUARE D,9070K75D1,INDUSTRIAL CONTROL TRANSFORMER NOS

    • 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
  • SQUARE D,9070T150D13,CONTROL TRANSFORMER 0.15KVA

    SQUARE D,9070T150D13,CONTROL TRANSFORMER 0.15KVA

    • 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 ...

    $30 USD
    Galion, OH
  • Square D,SK5271R,Transformer Disconnect Series A

    Square D,SK5271R,Transformer Disconnect Series A

    • Manufacturer: Square D

    New unused no 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 to make su...

    $180 USD
    Galion, OH
  • SQUARE D,9070-SK5271N,TRANSFORMER DISCONNECT .87-1.09/.43-.54A 50/60

    SQUARE D,9070-SK5271N,TRANSFORMER DISCONNECT .87-1.09/.43-.54A 50/60 HZ

    • 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 ...

    $48 USD
    Galion, OH
  • Trusted Seller
    MO-5649, SQUARE D 15S1H INSULATED

    MO-5649, SQUARE D 15S1H INSULATED TRANSFORMER. 15 KVA. 1 PH. 240 x 480 HV.

    • Manufacturer: Square D

    “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.”

    $350 USD
    Willoughby, OH
  • Trusted Seller
    MO-5966, SQUARE D 225T3HIS TRANSFORMER.

    MO-5966, SQUARE D 225T3HIS TRANSFORMER. 225 KVA. 480 HV. 208Y/120 LV. 3 PH.

    • Manufacturer: Square D

    “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.”

    $2,500 USD
    Willoughby, OH
  • SQUARE D,9070E0-1,TRANSFORMER .035/.050KVA

    SQUARE D,9070E0-1,TRANSFORMER .035/.050KVA

    • 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 ...

    $15 USD
    Galion, OH
  • Trusted Seller
    MO-5965, SQUARE D 225T3HIS TRANSFORMER.

    MO-5965, SQUARE D 225T3HIS TRANSFORMER. 225 KVA. 480 HV. 208Y/120 LV. 3 PH.

    • Manufacturer: Square D

    “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.”

    $2,500 USD
    Willoughby, OH
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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.