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Used Power Transformers in USA

  • Nunome Electric,53390,66VA Transformer

    Nunome Electric,53390,66VA Transformer

    • Manufacturer: Nunome

    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,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
  • SIGNAL TRANSFORMER,DST-5-28,SPLIT/TRAP TRANSFORMER 12VA 12/240

    SIGNAL TRANSFORMER,DST-5-28,SPLIT/TRAP TRANSFORMER 12VA 12/240 LOT OF 2

    • Manufacturer: Signal

    SIGNAL TRANSFORMER,DST-5-28,SPLIT/TRAP TRANSFORMER 12VA 12/240 LOT OF 2 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...

    $35 USD
    Galion, OH
  • Acme,TA-2-81005,Transformer

    Acme,TA-2-81005,Transformer

    • Manufacturer: Acme

    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
  • Trusted Seller
    POWERTRAN 3PTN40-75K 480V 75KVA TRANSFORMER

    POWERTRAN 3PTN40-75K 480V 75KVA TRANSFORMER WITH DISCONNECT SWITCH

    • Manufacturer: POWERTRAN

    POWERTRAN 3PTN40-75K general-purpose transformer available. Ideal for diverse applications. Used condition from a reliable manufacturer, perfect for those seeking trusted performance. Specification Table

    $1,500 USD
    Detroit, MI
  • Trusted Seller
    Hammond Power Solutions – Q005PEKF

    Hammond Power Solutions – Q005PEKF Transformer 600V – 120/240V, 5 kVA

    • Manufacturer: Hammond

    Hammond Power Solutions Q005PEKF transformer available, used condition. Ideal for various electrical applications. Renowned manufacturer Hammond Power Solutions ensures reliable performance. Perfect for those in ...

    $725 USD
    Detroit, MI
  • Trusted Seller
    MARELCO POWER SYSTEMS M-7710E /

    MARELCO POWER SYSTEMS M-7710E / CSA-008776-01 20KVA 230V TRANSFORMER

    • Manufacturer: MARELCO POWER SYSTEMS

    The Marelco Power Systems M-7710E / CSA-008776-01 is a used, industrial-grade dry-type transformer designed to deliver reliable voltage transformation in demanding electrical systems. With a 20 kVA capacity and a...

    $3,500 USD
    Detroit, MI
  • Dongan,36-05-N,Transformer .050 KVA 60 HZ

    Dongan,36-05-N,Transformer .050 KVA 60 HZ

    • Manufacturer: Dongan

    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
  • Payne Engineering,11D-4-80,Power Transformer

    Payne Engineering,11D-4-80,Power Transformer

    • Manufacturer: Payne Engineering

    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 ...

    $156 USD
    Galion, OH
  • GENERAL ELECTRIC,7702-0030-01,POWER TRANSFORMER NOS

    GENERAL ELECTRIC,7702-0030-01,POWER TRANSFORMER NOS

    • Manufacturer: GE

    GENERAL ELECTRIC,7702-0030-01,POWER 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...

    $25 USD
    Galion, OH
  • RELIANCE,411027-1S,TRANSFORMER POWER SUPPLY NOS

    RELIANCE,411027-1S,TRANSFORMER POWER SUPPLY NOS

    • Manufacturer: Reliance Electric

    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 ...

    $110 USD
    Galion, OH
  • Transformers Inc,050025,Transformer 2 KVA

    Transformers Inc,050025,Transformer 2 KVA

    • Manufacturer: Transformers inc

    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...

    $96 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
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.