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Used Power Transformers

  • 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
  • T-2-53516-3S | Acme Transformer SR

    T-2-53516-3S | Acme Transformer SR GP Transformers 240x480:120/240 LOT OF 2 - Used

    • Manufacturer: Acme

    $397 USD
    Baroda, MI
  • 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
  • Trusted Seller
    POWERTRAN 36 B #0672225

    POWERTRAN 36 B #0672225

    • Manufacturer: POWERTRAN

    Kva: 30 | High voltage: 480v | Low voltage: 240/120v | Hz: 60 | Phase: 3ph | Weight: 315lbs

    Toledo, OH
  • Trusted Seller
    POWERTRAN 36B #0777025

    POWERTRAN 36B #0777025

    • Manufacturer: POWERTRAN

    Kva: 30 | Primary voltage: 480v | Secondary voltage: 208/120v | Hz: 60 | Phase: 3ph

    Toledo, OH
  • 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
    POWERTRAN 36B #0672325

    POWERTRAN 36B #0672325

    • Manufacturer: POWERTRAN

    Kva: 30 | High voltage: 480v | Low voltage: 208/120v | Hz: 60 | Phase: 3ph | Weight: 315lbs

    Toledo, OH
  • Trusted Seller
    WESTINGHOUSE 1F3936 TRANSFORMER ($50 OBO)

    WESTINGHOUSE 1F3936 TRANSFORMER ($50 OBO)

    • Manufacturer: Westinghouse

    “USED, EXCELLENT” WESTINGHOUSE 1F3936 CONTROL TRANSFORMER 100 VA SINGLE PHASE ***Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide your ...

    $50 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
    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
  • Emerson HZ125000R Hevi-Duty Wall Mount

    Emerson HZ125000R Hevi-Duty Wall Mount Transformer

    • Manufacturer: Emerson

    “Used item as seen in the images. No additional items are included in the sale.” Emerson HZ125000R Hevi-Duty Wall Mount Transformer 0-B247A-86942-SS-ZF This item is listed for free local pickup. We will ship fre...

    $864 USD
    Baroda, MI
  • Trusted Seller
    GENERAL SIGNAL T300 TRANSFORMER ($300

    GENERAL SIGNAL T300 TRANSFORMER ($300 OBO)

    • Manufacturer: GENERAL SIGNAL

    “USED, EXCELLENT” GENERAL SIGNAL T300 TRANSFORMER KVA .300 2 TYPE "HD-180" B ***Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide your d...

    $300 USD
    Waukesha, WI
  • Trusted Seller
    GENERAL ELECTRIC 1867 KVA TRANSFORMER

    GENERAL ELECTRIC 1867 KVA TRANSFORMER

    • Manufacturer: GE

    Wisconsin, USA
  • Michael Riedel DRUL 10000 UL-CSA

    Michael Riedel DRUL 10000 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 10000 UL-CSA Transformer 3-...

    $900 USD
    Baroda, MI
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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.