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Used Square D Power Transformers

  • 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
  • Square D,Class 9070 SK1000A2,Series A

    Square D,Class 9070 SK1000A2,Series A Transformer Disconnect

    • Manufacturer: Square D

    New in 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 to make ...

    $650 USD
    Galion, OH
  • Square D,9070T50D1SF41,Control Transformer 0.05 kVA

    Square D,9070T50D1SF41,Control Transformer 0.05 kVA

    • Manufacturer: Square D

    Used and 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 ma...

    $65 USD
    Galion, OH
  • Trusted Seller
    MO-5973, SQUARE D EX112T3HNLP TRANSFORMER.

    MO-5973, SQUARE D EX112T3HNLP TRANSFORMER. 112.5 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.”

    $1,500 USD
    Willoughby, OH
  • SQUARE D,9070T500D43,TRANSFORMER CONTROL 500VA 400/440/460-230

    SQUARE D,9070T500D43,TRANSFORMER CONTROL 500VA 400/440/460-230

    • 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...

    $240 USD
    Galion, OH
  • SQUARE D,9070-K50D1,INDUSTRIAL CONTROL TRANSFORMER .050

    SQUARE D,9070-K50D1,INDUSTRIAL CONTROL TRANSFORMER .050 KVA 50HZ .050 KVA 60HZ

    • Manufacturer: Square D

    SQUARE D,9070-K50D1,INDUSTRIAL CONTROL TRANSFORMER .050 KVA 50HZ .050 KVA 60HZ 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...

    $30 USD
    Galion, OH
  • Square D,9070TF500D1,Control Transformer 50/60Hz 0.5/0.3kVA

    Square D,9070TF500D1,Control Transformer 50/60Hz 0.5/0.3kVA

    • Manufacturer: Square D
    • Model: 9070TF500D1

    Used and 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 ma...

    $65 USD
    Galion, OH
  • 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,500SV1B,1-Phase Transformer 0.500VA 240/480VAC

    Square D,500SV1B,1-Phase Transformer 0.500VA 240/480VAC

    • Manufacturer: Square D
    • Model: 500SV1B

    Used and 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 ma...

    $110 USD
    Galion, OH
  • SQUARE D,30T3H,TRANSFORMER 30KVA TRANSFORMER H.V.

    SQUARE D,30T3H,TRANSFORMER 30KVA TRANSFORMER H.V. 480 L.V. 208Y/120V

    • Manufacturer: Square D

    WILL ARRANGE SHIPPING WITH BUYER WEIGHT 280LBS MEASURING 28X28X30 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 photo...

    $550 USD
    Galion, OH
  • SQUARE D,EX30T3H,TRANSFORMER 3OKVA 3PH PRI

    SQUARE D,EX30T3H,TRANSFORMER 3OKVA 3PH PRI 480D SEC 208Y/120

    • Manufacturer: Square D

    WILL ARRANGE SHIPPING WITH BUYER SKIDDED WEIGHT 490LBS 28X32X38 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 ...

    $500 USD
    Galion, OH
  • SQUARE D,15T3H,TRANSFORMER 15KVA TRANSFORMER H.V.

    SQUARE D,15T3H,TRANSFORMER 15KVA TRANSFORMER H.V. 480 L.V. 208Y/120V

    • Manufacturer: Square D
    • Model: 15T3H

    WILL ARRANGE SHIPPING WITH BUYER WEIGHT 210 MEASURING 24X24X28 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 t...

    $450 USD
    Galion, OH
  • SQUARE D,9070-SK5271K-F30G13, TRANSFORMER DISCONNECT SWITCH

    SQUARE D,9070-SK5271K-F30G13, TRANSFORMER DISCONNECT SWITCH 600VAC

    • Manufacturer: Square D

    Used in good condition. Part was pulled from operation upon factory shutdown and has been in storage since. Please see pictures for details and condition. You will receive what’s in the pictures. If we have multi...

    $80 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
  • Square D,9070 MN500G0,Transformer Disconnect 500VA

    Square D,9070 MN500G0,Transformer Disconnect 500VA 230/460V 50/60Hz

    • Manufacturer: Square D

    Used in good condition. Part was pulled from operation upon factory shutdown and has been in storage since. Please see pictures for details and condition. You will receive what’s in the pictures. If we have multi...

    $92 USD
    Galion, OH
23456

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.