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Used Power Transformers

  • Trusted Seller
    PACIFIC 712553 L TRANSFORMER ($30

    PACIFIC 712553 L TRANSFORMER ($30 OBO)

    • Manufacturer: Pacific

    “Used, fair condition” PACIFIC 712553 L TRANSFORMER ***Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide your delivery instructions (add...

    $30 USD
    Waukesha, WI
  • Trusted Seller
    C175-5 TRANSFORMER ($15 OBO)

    C175-5 TRANSFORMER ($15 OBO)

      “Used, good condition” C175-5 TRANSFORMER ***Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide your delivery instructions (address, time...

      $15 USD
      Waukesha, WI
    • NEW - 30 KVA, 480/277

      NEW - 30 KVA, 480/277 VOLT, HAMMOND POWER SOLUTIONS, DRY TYPE TRANSFORMER

      • Manufacturer: Hammond

      Inventory id: 12315400000 | Rating: 30 | Primary voltage: 480 | Secondary voltage: 277 | Phase: 3 | Hertz: 60 | Taps above and below: 2-2 1/2 ABOVE, 4-2 1/2 BELOW | Impedance: 6.7 | Weight: 260 | Temperature ris...

      Pittsburgh, PA
    • Trusted Seller
      Northwestern II-10026 Jobsite Power Transformer

      Northwestern II-10026 Jobsite Power Transformer 25kva 440V 100A 1Ph 120V Outlet

      • Manufacturer: Northwestern

      Used, in Good Working Condition. This is a jobsite transformer. This takes 480V 3 phase power. 100 amp input. 40 amp pass through. 60 amps go to transformer. This would be a 25 kw 3 phase to 1 phase. (1) 20 amp 2...

      $2,970 USD
      Millersburg, IN
    • Trusted Seller
      HEVI-DUTY T150 TRANSFORMER ($35 OBO)

      HEVI-DUTY T150 TRANSFORMER ($35 OBO)

      • Manufacturer: Hevi-Duty

      “Used, good condition” HEVI-DUTY T150 TRANSFORMER 150 VA Type SMT Class 180 ***Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide your de...

      $35 USD
      Waukesha, WI
    • Trusted Seller
      STABIPACK SJX-A2403 TRANSFORMER ($30 OBO)

      STABIPACK SJX-A2403 TRANSFORMER ($30 OBO)

      • Manufacturer: STABIPACK

      STABIPACK SJX-A2403 TRANSFORMER 100/200 VAC 24 VDC 3 AMP ***Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide your delivery instructions...

      $30 USD
      Waukesha, WI
    • Trusted Seller
      ACME CAT. NO. T-1-81059 Transformer

      ACME CAT. NO. T-1-81059 Transformer - 0.75 kVA - ($75 OBO)

      • Manufacturer: Acme

      “Used, great working condition.” CAT. NO. T-1-81059 Single Phase Transformer 0.75 kVA Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide ...

      $75 USD
      Waukesha, WI
    • Michael Riedel DRUL 8000 UL-CSA

      Michael Riedel DRUL 8000 UL-CSA Transformer 3-Phase

      • Manufacturer: Michael Riedel

      “Used item as seen in the images. This is listed for local pickup only. We will ship freight at the expense of the purchaser. Please message for a freight quote.” Michael Riedel DRUL 8000 UL-CSA Transformer 3-P...

      $720 USD
      Baroda, MI
    • Trusted Seller
      PACIFIC 712553 D TRANSFORMER ($30

      PACIFIC 712553 D TRANSFORMER ($30 OBO)

      • Manufacturer: Pacific

      “Used, fair condition” PACIFIC 712553 D TRANSFORMER ***Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide your delivery instructions (add...

      $30 USD
      Waukesha, WI
    • Trusted Seller
      HAKKO MFG CO. TRANSFORMER ($65

      HAKKO MFG CO. TRANSFORMER ($65 OBO)

      • Manufacturer: Hakko

      “USED, EXCELLENT” HAKKO MFG CO. TRANSFORMER PRIMARY SIDE: 25V, 80V, 220V, 200V SECONDARY SIDE: 50VA, 10VA, 25VA, 4.5V ***Local deliveries available, simply message us before purchasing so we can properly adjust t...

      $65 USD
      Waukesha, WI
    • Trusted Seller
      3 PH 13.8 KVA M14128

      3 PH 13.8 KVA M14128 Marelco Power Systems Transformer PT No. M-14128

      • Manufacturer: Marelco

      Marelco Power Systems Transformer PT No. M-14128 3 PH 13.8 KVA Will ship via UPS Shipping weight is 90 Lbs INV No. P-57

      $400 USD
      Henderson, KY
    • Trusted Seller
      RUBSAMEN 0321 CONTROL TRANSFORMER ($40

      RUBSAMEN 0321 CONTROL TRANSFORMER ($40 OBO)

      • Manufacturer: Rübsamen Herr

      “GOOD, EXCELLENT CONDITION” 0321 CONTROL TRANSFORMER 50 VA 400 V 230 V 50/60HZ ***Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide your...

      $40 USD
      Waukesha, WI
    • Trusted Seller
      PACIFIC 712556J TRANSFORMER ($30 OBO)

      PACIFIC 712556J TRANSFORMER ($30 OBO)

      • Manufacturer: Pacific

      “Used, fair condition” PACIFIC 712556J TRANSFORMER ***Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide your delivery instructions (addr...

      $30 USD
      Waukesha, WI
    • Emerson ASCO 7000 Series Power

      Emerson ASCO 7000 Series Power Transfer Switch, 400A, 220V, 3ph NEW

      • Manufacturer: Asco

      The Emerson ASCO 7000 Series Power Transfer Switch is a new automatic switch designed for industrial use. With a rated amperage of 400A and a voltage of 220V, 3-phase, it is suitable for transferring power in a v...

      $7,500 USD

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      Est. $147/mo

      Graytown, OH
    • Trusted Seller
      GENERAL ELECTRIC 1867 KVA TRANSFORMER

      GENERAL ELECTRIC 1867 KVA TRANSFORMER

      • Manufacturer: GE
      • Model: 1500 KVA

      Wisconsin, USA
    3435363738

    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.