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Used Isolation Transformers

  • General Electric 9T23Q4002G21 QL 208V

    General Electric 9T23Q4002G21 QL 208V Pri-230V Sec 3Ph 27kva Isolation Transformer

    • Manufacturer: General

    General Electric 9T23Q4002G21 Type QL 208V Pri-230V Sec 3Ph Drive Isolation Transformer Type QL 133 Volts (Line-Neutral) 27.0 Kva 4.8% Impedance Aluminum Conductor Enclosure Type 2 Rai...

    Watertown, CT
  • Trusted Seller
    GS HEVI-DUTY ELECTRIC S5H155 TRANSFORMER

    GS HEVI-DUTY ELECTRIC S5H155 TRANSFORMER MAX VOLTS 502 HZ 60 HV 240/430

    • Manufacturer: Hevi-Duty

    “OLD STOCK” GS HEVI-DUTY ELECTRIC CAT S5H155 TRANSFORMER SER E CONNECT 1-2 VOLTS 502 CONNECT 2-3 VOLTS 492 CONNECT 3-4 VOLTS 480 CONNECT 4-5 VOLTS 468 CONNECT 5-6 VOLTS 456 CONNECT 6-7 VOLTS 444 CONNECT 7-8 VOLTS...

    $1,230 USD
    Coffeyville, KS
  • Trusted Seller
    CHALLENGER 123-NP3-MOD.5 #85421

    CHALLENGER 123-NP3-MOD.5 #85421

    • Manufacturer: Challenger

    DRIVE ISOLATION TRANSFORMER Class: AA | Motor drive: Three Phase, 60 HZ | Pri: 575 Delta | Sec: 460Y/266 | 4.7% imped: 170° C | Kva: 118 | Rise: 150° Cont. C | Weight: 600 pounds

    Ames, IA
  • Trusted Seller
    GT SERIES UPS – UL

    GT SERIES UPS – UL LISTED (5-10KVA) Transformer Power Transformers

    • Manufacturer: GE

    “In good condition.” Features & Benefits • Tower and/or rack design - Maximum site flexibility; all necessary parts delivered in packing box • Backfeed protection as standard - Ensuring site safety without additi...

    $949 USD
    Chico, TX
  • Trusted Seller
    GE DRIVE ISOLATION TRANSFORMER 9T23Q5180

    GE DRIVE ISOLATION TRANSFORMER 9T23Q5180 145.0 KVA 50/60 HZ 3 PH 4.1% 150 C RISE

    • Manufacturer: GE

    “GOOD CONDITION” LIFETIME GEARING HELICAL GEAR, 806609, 13 1/2" OD, 2 1/2" ID, 81 TEETH, 5 UOT LIFETIME GEARINGHELICAL GEAR806609RIGHT HANDOUTSIDE DIAMETER: 13 1/2"FACE WIDTH: 1 5/8"INSIDE DIAMETER: 2 1/2"HUB DIA...

    $3,000 USD
    Coffeyville, KS
  • Trusted Seller
    STACO Energy DU-5 Signal Step

    STACO Energy DU-5 Signal Step Down Transformer with Artisan Time Capsule 438U Power Transformers

    • Manufacturer: Staco

    “Excellent working condition” STACO Energy DU-5 Signal Step Down Transformer with Artisan Time Capsule 438U STACO General Purpose Transformer with: DU-5 Signal Step-Down Isolation Transformer • Power - 250 VA to ...

    $4,615 USD
    Chico, TX
  • Single-Phase Transformers 5kva, 25kva, 30kva

    Single-Phase Transformers 5kva, 25kva, 30kva

      5 kVA Marcus 1ph Isolation Type, 480V-120/240 - $350. 5 kVA REX 1ph Isolation Type, 208V-210/220/230V, Condition: Like new - $450. 25 kVA Rex single phase transformer. 1ph, 600-240/120 - SOLD 25 kVA Marcus 1ph, 3...

      Toronto, Canada
    • 3-Phase Iso 30 KVA Transformer,

      3-Phase Iso 30 KVA Transformer, 600 - 208Y/120V, Copper Windings

        REX 30 KVA 3-Phase Isolation Transformer – 600V to 208Y/120V All Copper Windings Condition: In excellent working condition. Price: $1450 Contact for more information or arrange viewing.

        $1,051 USD
        Toronto, Canada
      • 15kVA Isolation Transformer, 3-Ph, 600V

        15kVA Isolation Transformer, 3-Ph, 600V - 220Y/127V - All Copper

          Polaris 15 kVA Isolation Transformer - 600V to 220Y127V 3Ph - All Copper Model: 3PK-015K-ATDY Adjustable Taps All Copper Windings Excellent Condition, tested Price: $1,200 For more details or to arrange a viewing...

          $870 USD
          Toronto, Canada
        • 3-Phase Transformers 600V - 208V/220V/240V/280V

          3-Phase Transformers 600V - 208V/220V/240V/280V

            3 kVA Hammond 3ph auto, step-down 600V to 220V - $300 3 kVA Hammond, 3ph. ISO, 600-240V, Cat. No. K39M - SOLD 4.5 kVA Hammond 3ph auto, 600-220V, Auto-transformer - $400 6 kVA Thormag 3ph, 600-220V - $400 6 kVA M...

            Toronto, Canada
          • Tripp Lite Isolation Transformers

            Tripp Lite Isolation Transformers

            • Manufacturer: Tripp Lite - Eaton

            LOT OF 4 Tripp Lite IS250HG 'The Isolator' Isolation Transformer With Faraday Shield Made in Taiwan New - In original packaging

            $760 USD
            Riverview, FL
          • 208-380V transformers 20,30,50, Kva. Step-up

            208-380V transformers 20,30,50, Kva. Step-up 400V, 415V,380Y/220

              Step up transformers 20,25,30,50 kVA. Available. Also, usable 220-400V or 230-415V all copper windings, Isolation type. 20 Kva: 208,220 - 380,400V - $1100, 25 Kva: 208 - 380V - $1250, 30 Kva: $1800 50 Kva: 480V -...

              Toronto, Canada
            • Trusted Seller
              Used Voltage Transformer

              Used Voltage Transformer

              • Manufacturer: RFS Protech LLC

              The information provided is a general overview and is intended for informational purposes only. Specifications and features may vary depending on the model year, customizations, or specific configurations. Key F...

              Texas, USA
            • Trusted Seller
              Used Eaton Voltage Transformer

              Used Eaton Voltage Transformer

              • Manufacturer: Eaton

              The information provided is a general overview and is intended for informational purposes only. Specifications and features may vary depending on the model year, customizations, or specific configurations. Key F...

              Texas, USA
            • Trusted Seller
              Used Square D Voltage Transformer

              Used Square D Voltage Transformer

              • Manufacturer: Square D

              The information provided is a general overview and is intended for informational purposes only. Specifications and features may vary depending on the model year, customizations, or specific configurations. Key F...

              Texas, USA
            1819202122

            Overview

            Isolation transformers provide electrical separation between the supply and the load to reduce electrical noise, prevent ground loops, and improve personnel and equipment safety. Common in industrial and control applications, they come in dry or oil-filled designs, single- or three-phase, and a wide range of kVA ratings. They protect sensitive electronics and stabilize power for panels, drives, and mobile equipment charging.

            FAQ

            What should I consider when buying a used isolation transformer?

            Check kVA rating, primary/secondary voltages, phase, impedance, insulation condition, nameplate details and test records. Verify oil condition for oil-filled units, look for corrosion or damage, and request recent ratio and insulation resistance tests.

            How do I ensure the isolation transformer is shipped safely?

            Use a carrier experienced with heavy electrical gear, secure lifting points and skids, drain oil if required and comply with hazmat rules for oil-filled units. Crate or brace the unit, label weight and center of gravity, and insure for transit.

            What is the maintenance schedule for an isolation transformer?

            Perform visual checks monthly, tighten connections and inspect bushings yearly, carry out insulation resistance and turns-ratio tests annually, do oil sampling and treatment per manufacturer intervals, and use thermography for load checks.