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Used Power Transformers

  • General Electric 9T21J6001 General Purpose

    General Electric 9T21J6001 General Purpose Transformer 6 kVA

    • Manufacturer: GE

    “Clean used item as seen in the images. Includes 30 day warranty.” General Electric 9T21J6001 General Purpose Transformer 6 kVA 0-B385A-21640-GX This item is listed for free local pickup. We will ship freight at...

    $1,710 USD
    Baroda, MI
  • MICAFIL CGI 30 kV, 73D57098

    MICAFIL CGI 30 kV, 73D57098 Insulator Electrical Transformer Bushing, ABB

    • Manufacturer: ABB

    “This unit may be new. The 9th image shows that it was mounted before. Not positive if these mounting marks are from testing or not. Very clean. Please see images.” MICAFIL CGI 30 kV, 73D57098 Insulator Elect...

    $1,350 USD
    Baroda, MI
  • Trusted Seller
    Marelco M-18663E 28kVA Transformer ($1600

    Marelco M-18663E 28kVA Transformer ($1600 OBO)

    • Manufacturer: Marelco

    “Used, very good condition.” PT NO. M-18663E 28 kVA 60Hz 3 PH Marelco Power Systems Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide yo...

    $1,600 USD
    Waukesha, WI
  • Trusted Seller
    ALLEN BRADLEY 1497-N49PA CONTROL TRANSFORMER

    ALLEN BRADLEY 1497-N49PA CONTROL TRANSFORMER ($120 OBO)

    • Manufacturer: Allen-Bradley

    ALLEN BRADLEY 1497-N49PA CONTROL TRANSFORMER 1497 CCT 500VA 240/480 PRI 24 SEC ***Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide your...

    $120 USD
    Waukesha, WI
  • Trusted Seller
    HAMMOND POWER SOLUTIONS PH50QR CONTROL

    HAMMOND POWER SOLUTIONS PH50QR CONTROL TRANSFORMER ($65 OBO)

    • Manufacturer: Hammond

    HAMMOND POWER SOLUTIONS PH50QR CONTROL TRANSFORMER 1 PHASE PRIMARY: 240/480 VAC SECONDARY: 12/24 VAC 50/60 HERTZ 50 VA ***Local deliveries available, simply message us before purchasing so we can properly adjust ...

    $65 USD
    Waukesha, WI
  • Trusted Seller
    SQUARE D 9070-SK3000G3 TRANSFORMER ($650

    SQUARE D 9070-SK3000G3 TRANSFORMER ($650 OBO)

    • Manufacturer: Square D

    “USED, EXCELLENT” SQUARE D 9070-SK3000G3 TRANSFORMER 600 VAC SERIES A 60 HERTZ ***Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide your...

    $650 USD
    Waukesha, WI
  • Murr Electronik Transformer, #86153, Same

    Murr Electronik Transformer, #86153, Same Day Shipping, LG-2068

    • Manufacturer: Murrelektronik

    LG-2068 Feel free to ask any questions Please see pictures for more information and item conditions.Please feel free to ask any questions We are always looking for new and used industrial items so please let me k...

    $399 USD
    Hamilton, MI
  • Trusted Seller
    ACME Transformer DTGB0934S 93KVA ($4,500

    ACME Transformer DTGB0934S 93KVA ($4,500 OBO)

    • Manufacturer: Acme

    “Used, very good condition; REFURBISHED 2025.” CATALOG NO - DTGB0934S 93 KVA 60 HZ 3 PHASE WEIGHT - 693lbs Local deliveries available, simply message us before purchasing so we can properly adjust the listing for...

    $4,500 USD
    Waukesha, WI
  • IPB50167G | International Power Power

    IPB50167G | International Power Power Transformer - Used

    • Manufacturer: International Power

    $260 USD
    Baroda, MI
  • Trusted Seller
    Square D Class 9070 Transformer

    Square D Class 9070 Transformer Disconnect SK1000G1 Series A 230/460 to 115 volt

    • Manufacturer: Square D

    Square D Class 9070 Transformer Disconnect 600VAC Type: SK1000G1 Series A Primary Voltage: 230/460V Secondary Voltage: 115V Please review all pictures and ask questions before purchase. We can provide additional ...

    $399 USD
    Elk Grove Village, IL
  • Trusted Seller
    EGS SOLA E050E INDUSTRIAL CONTROL

    EGS SOLA E050E INDUSTRIAL CONTROL TRANSFORMER ($30 OBO)

    • Manufacturer: EGS

    “USED, EXCELLENT” EGS SOLA E050E INDUSTRIAL CONTROL TRANSFORMER 1 PHASE 0.05 KVA 1 OUTPUT WINDING 3.99 INCH DEEP X 2.72 INCH HIGH CONTROL TRANSFORMER 2 INPUT ***Local deliveries available, simply message us befor...

    $30 USD
    Waukesha, WI
  • Trusted Seller
    Dongan CAT. NO 80-1035, 1kVA

    Dongan CAT. NO 80-1035, 1kVA Transformer, ($100 OBO)

    • Manufacturer: Dongan

    “Used, good condition.” CAT. NO: 80-1035 KVA: 1.0 PRIMARY VOLTS: 240X480 SECONDARY VOLTS: 120/240 ENCLOSURE RATING: 3R Local deliveries available, simply message us before purchasing so we can properly adjust the...

    $100 USD
    Waukesha, WI
  • Trusted Seller
    EATON C0500E6U CONTROL TRANSFORMER ($250

    EATON C0500E6U CONTROL TRANSFORMER ($250 OBO)

    • Manufacturer: Eaton

    EATON C0500E6U CONTROL TRANSFORMER 500 VA 1 PHASE SECONDARY FUSEHOLDER CLASS A INSULATION 50/60 HERTZ ***Local deliveries available, simply message us before purchasing so we can properly adjust the listing for ...

    $250 USD
    Waukesha, WI
  • Trusted Seller
    FANUC A81L-0001-0342-03 TRANSFORMER ($35 OBO)

    FANUC A81L-0001-0342-03 TRANSFORMER ($35 OBO)

    • Manufacturer: Fanuc

    “USED, EXCELLENT” FANUC A81L-0001-0342-03 TRANSFORMER AC253V 24 A 0.15mH ***Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide your deliv...

    $35 USD
    Waukesha, WI
  • Trusted Seller
    BLOCK TYPE GB 110/24-3P TRANSFORMER

    BLOCK TYPE GB 110/24-3P TRANSFORMER ($50 OBO)

    • Manufacturer: BLOCK

    “USED, EXCELLENT” BLOCK TYPE GB 110/24-3P TRANSFORMER 110VAC 24VDC 50-60 HERTZ Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide your de...

    $50 USD
    Waukesha, WI
1819202122

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.