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Used Square D Power Transformers

  • SQUARE D,250SV1B,GENERAL PURPOSE TRANSFORMER PRE-480-240V

    SQUARE D,250SV1B,GENERAL PURPOSE TRANSFORMER PRE-480-240V SEC-240/120-120/240

    • Manufacturer: Square D

    SQUARE D,250SV1B,GENERAL PURPOSE TRANSFORMER PRE-480-240V SEC-240/120-120/240 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 ...

    $100 USD
    Galion, OH
  • Square D,750SV1F,Transformer .750kVA 1PH Primary

    Square D,750SV1F,Transformer .750kVA 1PH Primary 480/240V SEC 240/120V

    • Manufacturer: Square D

    New unused without 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 t...

    $140 USD
    Galion, OH
  • 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 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
  • Square D 10S1F Encapsulated Dry

    Square D 10S1F Encapsulated Dry Type Transformer 10kVA 1 Phase

    • Manufacturer: Square D

    “Used item as seen in the images. No additional items are included in the sale.” Square D 10S1F Encapsulated Dry Type 10kVA 1 Phase 0-B127B-85726-EW-XX This item is listed for free local pickup. We will ship fre...

    $675 USD
    Baroda, MI
  • 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
  • Square D 9070TF300D1 Transformer. Loc4D-24

    Square D 9070TF300D1 Transformer. Loc4D-24

    • Manufacturer: Square D

    Square D 9070TF300D1 Transformer. Loc4D-24* We repair all types of industrial automation including AC Servo Drives, Servo Motors, Operator Interface Panels, PLC's, Sensors, Process Controls and Timers. Palm...

    $262 USD
    Duncan, SC
34567

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.