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Used Square D Power Transformers in Wisconsin, USA

  • Trusted Seller
    SQUARE D 9070TF50D1 CONTROL TRANSFORMER

    SQUARE D 9070TF50D1 CONTROL TRANSFORMER ($40 OBO)

    • Manufacturer: Square D

    SQUARE D 9070TF50D1 600V 30A TRANSFORMER CONTROL ***Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide your delivery instructions (addres...

    $40 USD
    Waukesha, WI
  • Trusted Seller
    SQUARE D 9070T150D13 CONTROL TRANSFORMER

    SQUARE D 9070T150D13 CONTROL TRANSFORMER ($45 OBO)

    • Manufacturer: Square D

    “USED, EXCELLENT” SQUARE D 9070T150D13 CONTROL TRANSFORMER 150VA 24V 50-60 HZ ***Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide your ...

    $45 USD
    Waukesha, WI
  • Trusted Seller
    SQUARE D 9070TF350D1 CONTROL TRANSFORMER

    SQUARE D 9070TF350D1 CONTROL TRANSFORMER ($130 OBO)

    • Manufacturer: Square D

    “USED, EXCELLENT” SQUARE D 9070TF350D1 CONTROL TRANSFORMER 1 PHASE 30 AMP 350 VA PRI 240/480V SEC 120V ***Local deliveries available, simply message us before purchasing so we can properly adjust the listing for ...

    $130 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
  • Trusted Seller
    SQUARE D 9070-K50D2F14 INDUSTRIAL CONTROL

    SQUARE D 9070-K50D2F14 INDUSTRIAL CONTROL TRANSFORMER ($35 OBO)

    • Manufacturer: Square D

    “USED, EXCELLENT” SQUARE D 9070-K50D2F14 INDUSTRIAL CONTROL TRANSFORMER 50 VA 240/480 VAC 50/60 HZ 24 V SECONDARY ***Local deliveries available, simply message us before purchasing so we can properly adjust the l...

    $35 USD
    Waukesha, WI
  • Trusted Seller
    SQUARE D 2S46F BUCK BOOST

    SQUARE D 2S46F BUCK BOOST TRANSFORMER ($200 OBO)

    • Manufacturer: Square D

    “Used, great condition” SQUARE D 2S46F BUCK BOOST TRANSFORMER 2kVA 1 Phase 60Hz Primary Voltage 120 x 240 V Secondary Voltage 16/32 V Insulation Temperature 356 °F (180 °C) Temperature Rise 115 °C NEMA 3R Enclosu...

    $200 USD
    Waukesha, WI
  • Trusted Seller
    Square D - 30T3H -

    Square D - 30T3H - 30kVA Transformer ($950 OBO)

    • Manufacturer: Square D

    “Used, great condition; refurbished.” 30 kVA Class AA WT. 350 lbs HZ 60 Type SO Style NO. 33349-17212-020 Cat. No. 30T3H

    $950 USD
    Waukesha, WI
  • Trusted Seller
    Square D Transformer CAT NO.

    Square D Transformer CAT NO. 5S1F 5kVA ($175 OBO)

    • Manufacturer: Square D

    “Used, great condition.” CAT NO. 5S1F 5 kVA Single Phase Transformer Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide your delivery ins...

    $175 USD
    Waukesha, WI
  • Trusted Seller
    Square D CAT NO. 2S1F

    Square D CAT NO. 2S1F Transformer - 2kVA - ($150 OBO)

    • Manufacturer: Square D

    “Used, great working condition.” CAT. NO. 2S1F DRY TYPE TRANSFORMER SINGLE PHASE 2.0 KVA Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provi...

    $150 USD
    Waukesha, WI
  • Trusted Seller
    Square D CAT. NO. 760SV1F

    Square D CAT. NO. 760SV1F Transformer - 0.75 kVA - ($80 OBO)

    • Manufacturer: Square D

    “Used, great working condition.” CAT. NO. 760SV1F Single Phase Transformer 0.750 kVA Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide y...

    $80 USD
    Waukesha, WI

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.