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Used Square D Power Transformers

  • Square D 150kVA 480V 60Hz

    Square D 150kVA 480V 60Hz 3P Transformer 208Y/120 EX150T3H 🟦

    • Manufacturer: Square D

    Square D 150kVA 480V 60Hz 3P Transformer 208Y/120 EX150T3H ***30-day Warranty- Guaranteed to work or your money back.*** ***This item may exhibit signs of prior use, such as scratches, scuffs, or dents, these cos...

    $3,217 USD
    Arlington, TX
  • Square D,9070 EO-2,Industrial Control Transformer

    Square D,9070 EO-2,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 ...

    $28 USD
    Galion, OH
  • Square D 500kVA 480V Dry

    Square D 500kVA 480V Dry Type Transformer 208Y/120 3Ph 60Hz 500T68H 🟦

    • Manufacturer: Square D

    Square D 500kVA 480V Dry Type Transformer 208Y/120 3Ph 60Hz 500T68H Stepdown: 208Y/120V ***30-day Warranty- Guaranteed to work or your money back.*** ***This item may exhibit signs of prior use, such as scratches...

    $8,873 USD

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    Est. $174/mo

    Arlington, TX
  • Square 112.5 480V Dry Type

    Square 112.5 480V Dry Type Transformer 3Ph 60Hz EXN112T3H 🟦

    • Manufacturer: Square D

    Square 112.5 480V Dry Type Transformer 3Ph 60Hz EXN112T3H Stepdown: 208Y/120V ***30-day Warranty- Guaranteed to work or your money back.*** ***This item may exhibit signs of prior use, such as scratches, scuffs, ...

    $2,319 USD
    Arlington, TX
  • SQUARE D,9070TF500D1,CONTROL TRANSFORMER 0.5KVA PRI

    SQUARE D,9070TF500D1,CONTROL TRANSFORMER 0.5KVA PRI 220/240V SEC 440/480V

    • Manufacturer: Square D
    • Model: 9070TF500D1

    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
  • Square D 225T3HF 225-kVA 3-Ph

    Square D 225T3HF 225-kVA 3-Ph Industrial Transformer Pri:480VAC Sec:208/120VAC

    • Manufacturer: Square D

    Home Contact About Technology Industrial Lab & Test Electrical Semiconductor Square D 225T3HF 225-kVA 3-Ph Industrial Transformer Pri:480VAC Sec:208/120VAC Manufacturer: Square D Model: 225T3HF Condition: Used We...

    $4,000 USD
    Leander, TX
34567

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.