Transformers: Pricing, Used and Surplus Equipment

Compare dry-type, pad-mounted and power transformers for data center and industrial electrical systems. Transformer pricing is useful only when the voltage, kVA or MVA rating, cooling arrangement, condition and included equipment are defined.

Use this catalogue to identify equipment families and prepare a sourcing request. Availability, suitability and commercial terms must be confirmed for the actual unit.

Model research (32)

Research records, not current offers. Open each page for the rating basis and its sources.

Transformer price: compare the required specification

The price of a transformer does not establish whether it fits the project. Ask for the nameplate and data sheet before comparing offers, and identify the total cost of putting the equipment into service.

Required informationWhy it belongs in the quote
kVA/MVA and cooling ratingsDefines the applicable capacity basis
Primary/secondary voltage, phase and frequencyEstablishes the intended electrical interface
Connection, impedance and tapsSupports compatibility and protection review
Insulation and fluid detailsSupports site, maintenance and installation review
Condition and test recordsIdentifies evidence behind new, used or refurbished descriptions
Accessories and delivery scopeSeparates equipment cost from transport, assembly and commissioning

Used dry type transformers for sale: buying checks

When evaluating used dry type transformers for sale, request nameplate photographs, service and storage history, inspection records and the seller’s test scope. Verify winding connection, voltage ratio, enclosure, cooling and installation dimensions. Have the project’s electrical designer assess loading and harmonic conditions rather than assuming a generic derating factor.

Compare construction choices in the dry-type and cast-coil transformer guide.

Pad-mounted and power transformer options

For pad-mounted equipment, match the primary connection arrangement and installation interface as well as the rating. Use the pad-mount transformer guide and used-unit compatibility checklist.

For substation equipment, identify the required voltage, capacity, impedance, cooling and accessories before choosing a portfolio or manufacturer. The Hitachi Energy EconiQ transformer page explains how to structure a portfolio-specific enquiry.

Compare Transformers: Pricing, Used and Surplus Equipment (32 models)

Every published model in this category, compared on the specifications a data center buyer filters on first. Values come from each model dossier; an em dash means the specification is not documented, never an estimate.

ModelOEMTypeRatingPrimary voltageSecondary voltageCooling classImpedanceK-factor
MD-series motor drive isolationEaton Corporation plcLV Dry-Type7.5-1500 kVA————K-4 / K-13 / K-20
K-Factor rated dry-type transformers (K-4 / K-9 / K-13)MGM Transformer Company, Commerce, California; independent US builder of dry-type and liquid-filled distribution transformers.LV Dry-Type15-1,000 kVA480 / 600 V delta208Y/120, 480Y/277150 C—K-4 / K-9 / K-13
Three-phase pad-mounted transformers (30-3,000 kVA)ERMCO, a wholly owned subsidiary of Arkansas Electric Cooperatives, Inc., headquartered in Dyersburg, Tennessee.Pad-Mount Distribution30-3,000 kVA2.4-35 kVthrough 600 V65 C——
Envirotran FR3 pad-mounted transformersEaton Corporation plc, Cooper Power series; Cooper Power Systems was acquired by Eaton in 2012 and the Envirotran line is sold as Eaton's Cooper Power series.Pad-Mount Distribution45-10,000 kVA2,400-34,500 V120-15,000 V———
Envirotran hardened data center pad-mounted transformerEaton Corporation plc, Cooper Power series; the hardened data center pad-mount is the data-center build of Eaton's Envirotran FR3 line.Pad-Mount Distribution45-10,000 kVA2,400-34,500 V208Y/120-15,000 V———
Three-phase pad-mounted transformers (45-10,000 kVA)Howard Industries, Inc., Laurel, Mississippi; transformers are sold through its Howard Power Solutions division.Pad-Mount Distribution45-10,000 kVA (18 sizes)2,400-34,500 V120-8,600 V or 14,400Y———
DS-3 / DT-3 ventilated dry-typeEaton Corporation plcLV Dry-Type112.5 kVA – 10,000 kVA2.4 kV – 34.5 kV208V – 4,160V150 std; 115 / 80 optional C——
FITformer fluid-immersed distribution transformersSiemens Energy AG, Grid Technologies transformer portfolio; FITformer is the current brand, with TUNORMA and TUMETIC on legacy Siemens AG nameplates.Substation (Liquid-Filled)421M USD Charlotte NC—250-800 V———
Pad-mounted transformers (500-7,500 kVA)Pennsylvania Transformer Technology, Inc., Canonsburg, Pennsylvania; founded 1929 and now a Quanta Services company.Pad-Mount Distribution500-7,500 kVA—————
Liquid-filled substation transformers (750-20,000 kVA)Hitachi Energy Ltd, US liquid-filled distribution business, continuing ABB Power Grids production after the October 2021 rename.Substation (Liquid-Filled)750-20,000 kVA69 kV————
10-40 MVA power transformer classABB Ltd; transformer business transferred to Hitachi ABB Power Grids on 2020-07-01 and renamed Hitachi Energy Ltd in October 2021. ABB no longer builds power transformers; nameplates in this class read ABB, ASEA, BBC or Westinghouse.Power & Substation (Oil-Filled)10-40 MVA base69-138 kV————
Large power transformers (10-350 MVA US; to 500 MVA Brazil)WEG S.A., Brazil; US power transformers are built by WEG Transformers USA in Washington, Missouri, with select units from Mexico.Power & GSU (Oil-Filled)10-350 MVA24.94-400 kV—ONAN / ONAF / ODAF / KNAN / KNAF——
Liquid-filled substation transformers (to 50 MVA / 138 kV)Niagara Power Transformer LLC, Buffalo, New York; a separate company from Niagara Transformer Corp, which operates in the same region under a similar name.Substation (Liquid-Filled)50 MVA—————
TMC cast-resin dry-typeTRAFO Power Solutions (Pty) Ltd (TMC Transformers S.p.A. partner)Cast-Resin Dry-Type50 kVA-25 MVA——AN / AF / AFAF / AFAW/WF——
Mobile substations, 50 MVA dual-voltage classWEG S.A., Brazil; mobile transformers are built in Brazil and turnkey mobile substations are integrated by Zest WEG, its South African subsidiary.Mobile Substation50 MVA110 / 60 (dual-rated) kV20 / 30 kV———
RESIBLOCHitachi Energy Ltd, RESIBLOC brand, Brilon, Germany; formerly ABB Power Grids, renamed October 2021.Cast-Resin Dry-Typeup to 63 MVA36 kV24 kVAN / ANAN / ANAF / AFWF——
HiDry dry-type power transformer, 40.5-72.5 kVHitachi Energy Ltd; the line launched under ABB as HiDry72 and moved with the 2020 Power Grids divestment. Current production and warranty sit with Hitachi Energy.Cast-Resin Dry-Type, 40.5-72.5 kV Subtransmission Class100 kVA – 40,000 kVA (40 MVA)Up to 36 kVUp to 3.3 kVAN/AF——
Mobile substations (to 120 MVA / 420 kV)Hitachi Energy Ltd, Grid and Power Quality Solutions; continues the ABB-era mobile substation line after the October 2021 rename.Mobile Substation120 MVA—————
Trihal cast-resin dry-type transformerSchneider Electric SE, Energy Management business; Trihal sits inside the SeT Series cast-resin range.Cast-Resin Dry-Type160 kVA-15 MVA36 kV—AN standard; AF with fans——
Pad-mounted oil-filled transformers (to 10 MVA)Virginia Transformer Corp., Roanoke, Virginia; founded 1971, independently US-owned, and the parent of Georgia Transformer in Rincon, Georgia.Pad-Mount Distribution500 kVA – 100 MVA4.16 kV – 230 kV480V – 34.5 kVONAN/ONAF/OFAF——
Generator step-up transformers, 13.2-25 kV to 69-765 kVProlec GE, wholly owned by GE Vernova Inc. since 2026-02-02 and reported inside its Electrification segment; formerly a Grupo Xignux and GE joint venture. The US large and medium power arm is Prolec-GE Waukesha, Inc.Power & GSU (Oil-Filled)600 single-phase / 900 three-phase MVA69-765 kV wye13.2-25 kV deltaONAN / ONAF / ODAF——
EHV/UHV power transformers (69-765 kV, to 2,250 MVA)Hyosung HICO, Ltd., Memphis, Tennessee, the US subsidiary of Hyosung Heavy Industries; the Memphis plant was acquired from Mitsubishi Electric Power Products in 2019.Power & GSU (Oil-Filled), 69-765 kV Transmission Class2,250 MVA—————
HV/EHV power transformer legacy class (69-765 kV)ABB Ltd; HV and EHV transformer production passed to Hitachi ABB Power Grids in 2020 and to Hitachi Energy Ltd in October 2021. The TrafoStar design platform continues under Hitachi Energy.Power & Substation (Oil-Filled), 69-765 kV Transmission Class—69-765 kV————
Mobile substations (to 133 MVA / 345 kV)Delta Star, Inc., Lynchburg, Virginia; founded 1908 in Chicago as Delta-Star Electric Company and employee-owned through an ESOP since the 1988 separation from H.K. Porter Company.Mobile Substation——————
HV and EHV power transformers, Montgomery, AlabamaHD Hyundai Electric Co., Ltd.; US units are built by HD Hyundai Power Transformers USA, Inc. in Montgomery, Alabama. Nameplates read Hyundai.Power & GSU (Oil-Filled), Extra-High-Voltage Class——————
EconiQ power transformer portfolio (natural ester)Hitachi Energy Ltd, EconiQ eco-efficient portfolio, introduced October 2021 after the ABB Power Grids divestment.Power & Substation (Ester-Filled), 115-765 kV Transmission Class——————
TXpand rupture-resistant tank systemHitachi Energy Ltd; TXpand was developed by ABB Inc. with Hydro-Quebec and published in 2019, then carried into the Hitachi Energy power transformer portfolio.Power Transformer Tank Design, 330-765 kV Class Demonstrated——————
Unit substation and medium power transformers (225-10,000 kVA)Howard Industries, Inc., Laurel, Mississippi; transformers are sold through its Howard Power Solutions division.Substation (Liquid-Filled)—2,400-69,000 V120-8,400 V or 14,400YOA (+FA option) / 65 C——
Power and substation transformers (5-750 MVA, to 765 kV)Pennsylvania Transformer Technology, Inc., Canonsburg, Pennsylvania; founded 1929 and now a Quanta Services company.Power & Substation (Oil-Filled)—69 / 138 / 345 / to 765 kV————
E-Saver OPAL series LV dry-typePowersmiths International Corp., Brampton, Ontario; a member of the Socomec Group.LV Dry-Typeappropriately K-rated————appropriately K-rated
GEAFOL and GEAFOL Neo cast-resin transformersSiemens Energy AG, Grid Technologies transformer portfolio; GEAFOL moved with the September 2020 spin-off from Siemens AG and is not a Siemens AG Smart Infrastructure product.Cast-Resin Dry-Type——————
Sensformer connectivity platform (now within the Noedra portfolio)Siemens Energy AG, Grid Technologies; Sensformer launched under pre-spin-off Siemens AG in April 2018 and now sits inside the Noedra digital grid portfolio.Digital & Monitoring——————

Which Transformer Do You Need

Indoor installation in a fire-rated space

Dry-type and cast coil units carry no liquid, so they avoid the containment, spill response, and fire-separation obligations that follow an oil-filled unit indoors. Cast coil buys sealed windings and better humidity tolerance at a higher price than ventilated dry-type. Dry-Type and Cast Coil Transformers: Selection, Sizing, and Where Each Belongs covers the detail.

Outdoor pad at the utility interface

Pad-mount units are the default at the service entrance: tamper-resistant enclosure, dead-front terminations, and no separate vault. Confirm DOE 2016 efficiency compliance and whether the fluid is mineral oil or a natural ester such as FR3. Pad Mount Transformers: Sizing, Configurations, and Current Lead Times covers the detail.

Space-constrained rooms with integrated switchgear

A unit substation ties primary switch, transformer, and secondary switchgear into one close-coupled lineup, removing cable runs and shortening the footprint. The cost is flexibility, and lead time is set by the slowest component in the lineup. Data Center Transformers: The Complete Selection and Procurement Guide covers the detail.

Nonlinear data center load

IT loads draw harmonic current, which heats a transformer beyond what its nameplate kVA implies. Whether the project needs a K-rated or harmonic-mitigating unit, or a derating of a standard unit, depends on the actual load profile; have the project's electrical designer assess it rather than applying a generic rule. Data Center Transformer Sizing Guide: Load Math, K-Factor, and Lead-Time Reality covers the detail.

Request transformer pricing

Send a transformer enquiry with the site, required in-service date, rating, voltages, connection, condition preference and available drawings. Ask the supplier to separate equipment, testing, transport, installation and commissioning charges. Confirm warranty and delivery milestones for the specific offer.

Technical source: Eaton’s transformer fundamentals. Use actual equipment records to approve compatibility; this hub is a procurement guide.

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