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Used Power Transformers

  • 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
  • Hevi-Duty,Type SZ0 48319,Control Cuircuit Transformer

    Hevi-Duty,Type SZ0 48319,Control Cuircuit Transformer 50/60 Cycles 0.300KVA

    • Manufacturer: Hevi-Duty

    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...

    $85 USD
    Galion, OH
  • SQUARE D,9070T50D1,CONTROL TRANSFORMER 0.05KVA

    SQUARE D,9070T50D1,CONTROL TRANSFORMER 0.05KVA

    • Manufacturer: Square D
    • Model: 9070T50D1

    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,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
  • AUTOMATIC SWITCH CO.,106A203,TRANSFORMER CONT. DUTY

    AUTOMATIC SWITCH CO.,106A203,TRANSFORMER CONT. DUTY 125V DC PRE-OWNED

    • Manufacturer: AUTOMATIC SWITCH

    AUTOMATIC SWITCH CO.,106A203,TRANSFORMER CONT. DUTY 125V DC PRE-OWNED 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 p...

    $225 USD
    Galion, OH
  • Trusted Seller
    HAMMOND POWER SOLUTIONS NMK015KD 15

    HAMMOND POWER SOLUTIONS NMK015KD 15 KVA Transformer Used

    • Manufacturer: Hammond
    • Model: NMK015KD

    HAMMOND POWER SOLUTIONS NMK015KD Transformer Delta-Delta 15 KVA Buyers are welcome to inspect equipment prior to purchase. Expedited shipping services are available upon request. This piece is located at Ide...

    $895 USD
    Holly, MI
  • EDWARDS,599,SIGNALING TRANSFORMER 120V AC PRIMARY

    EDWARDS,599,SIGNALING TRANSFORMER 120V AC PRIMARY 24V 40VA SECONDARY NEW

    • Manufacturer: Edwards

    New in original box. 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 sure...

    $16 USD
    Galion, OH
  • Daihen,100kVA,Transformer JEC-2200-1995 Pr 460V Sec

    Daihen,100kVA,Transformer JEC-2200-1995 Pr 460V Sec 210-105 Single Phase

    • Manufacturer: Daihen

    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 ...

    $2,000 USD
    Galion, OH
  • HITRAN,WI0110-00,INSULATED DRY TYPE TRANSFORMER 1000KVA

    HITRAN,WI0110-00,INSULATED DRY TYPE TRANSFORMER 1000KVA PRI 480 TO 1140Y/658

    • Manufacturer: Hitran

    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 ...

    $8,500 USD

    Get financing

    Est. $167/mo

    Galion, OH
  • P&H,75Q330D1,INDUSTRIAL CONTROL TRANSFORMER 300VA 50/60HZ

    P&H,75Q330D1,INDUSTRIAL CONTROL TRANSFORMER 300VA 50/60HZ NOS

    • Manufacturer: P & H

    New, box is dirty and distressed from storage. 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 r...

    $400 USD
    Galion, OH
  • TRANS TEC OPT,2860,TRANSFORMER 3KVA PRI

    TRANS TEC OPT,2860,TRANSFORMER 3KVA PRI 480V SEC 208Y 3PH

    • Manufacturer: TRANS TEC

    REFURBISHED IN GOOD CONDITION 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 ...

    $300 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
  • Micron Industrial Control,C100BTZ13,Transformer 0.100 KVA

    Micron Industrial Control,C100BTZ13,Transformer 0.100 KVA 230/460 to 115V

    • Manufacturer: Micron

    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...

    $35 USD
    Galion, OH
  • GE,9T58B505G30,Transformer 20kva 60hz 1p

    GE,9T58B505G30,Transformer 20kva 60hz 1p

    • 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 ...

    $40 USD
    Galion, OH
  • Nunome Electric,NESH1200MUL08002-10,Transformer 1.2k 50/60Hz

    Nunome Electric,NESH1200MUL08002-10,Transformer 1.2k 50/60Hz

    • Manufacturer: Nunome Electric

    New unused without 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 pictu...

    $280 USD
    Galion, 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.