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Used Delta Isolation Transformers

  • 870 KVA, 460 DELTA PRI,

    870 KVA, 460 DELTA PRI, 460Y/266 VOLT SEC, HETRAN, ISOLATION TRANSFORMER

    • Manufacturer: Delta

    Inventory id: 12043900000 | Rating: 870 | Primary voltage: 460 | Secondary voltage: 460 Y / 266 | Phase: 3 | Hertz: 60 | Taps above and below: 1 ABOVE, 1 BELOW | Impedance: 4.4 | Weight: 4,150 | Class: AA | Temp...

    Pittsburgh, PA
  • 145 KVA Rex isolation transformer

    145 KVA Rex isolation transformer primary 460 v Delta secondary 460 Y/266 or 480 v to 480 v T94

    • Manufacturer: Delta

    Stock # T94 Rex Isolation Transformer 145 kva, 3 phase, 60 hz , Cat No. DA145H1P1/K4, Type ANN, imp. 4 % winding rise 150 deg C insul. Class 220 deg C., Enclosure type-2 , Serial no. C 05, UL listed, winding CU/A...

    Canton, GA
  • Trusted Seller
    DELTA CITC0030

    DELTA CITC0030

    • Manufacturer: Delta
    • Phase type: Three-phase

    Kva: 30 kVA | Primary voltage: 480 volts | Secondary voltage: 120 volts | Phase: 3-phase | Transformer type: Power Transformer | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 2 | Made in:...

    $587 USD
    British Columbia, Canada
  • Trusted Seller
    DELTA CETC0075 S001534

    DELTA CETC0075 S001534

    • Manufacturer: Delta
    • Phase type: Three-phase

    Kva: 75 kVA | Primary voltage: 600 volts | Secondary voltage: 208/120 volts | Phase: 3-phase | Transformer type: Pad Mounted Transformer | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 3R

    $4,565 USD
    British Columbia, Canada
  • Trusted Seller
    DELTA CETC0075S001534

    DELTA CETC0075S001534

    • Manufacturer: Delta
    • Phase type: Three-phase

    Kva: 75 kVA | Primary voltage: 600 volts | Secondary voltage: 208/120 volts | Phase: 3-phase | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 3R

    $4,565 USD
    British Columbia, Canada
  • Trusted Seller
    DELTA CETC0075S001534

    DELTA CETC0075S001534

    • Manufacturer: Delta
    • Phase type: Three-phase

    Kva: 75 kVA | Primary voltage: 600 volts | Secondary voltage: 208/120 volts | Phase: 3-phase | Transformer type: Pad Mounted Transformer | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 3R

    $4,565 USD
    British Columbia, Canada
  • Trusted Seller
    DELTA CDSC0005GVA6XXJA

    DELTA CDSC0005GVA6XXJA

    • Manufacturer: Delta
    • Phase type: Single-phase

    Kva: 5 kVA | Primary voltage: 120 volts | Secondary voltage: 600 volts | Phase: Single-phase | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 1

    $661 USD
    British Columbia, Canada
  • Trusted Seller
    DELTA CDSC0005GVA6XXJA

    DELTA CDSC0005GVA6XXJA

    • Manufacturer: Delta
    • Phase type: Single-phase

    Kva: 5 kVA | Primary voltage: 120 volts | Secondary voltage: 600 volts | Phase: Single-phase | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 1

    $661 USD
    British Columbia, Canada
  • Trusted Seller
    DELTA CDSC0005GVA6XXJA

    DELTA CDSC0005GVA6XXJA

    • Manufacturer: Delta
    • Phase type: Single-phase

    Kva: 5 kVA | Primary voltage: 120 volts | Secondary voltage: 600 volts | Phase: Single-phase | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 1

    $661 USD
    British Columbia, Canada
  • Trusted Seller
    DELTA CDSC0005GVA6XXJA

    DELTA CDSC0005GVA6XXJA

    • Manufacturer: Delta
    • Phase type: Single-phase

    Kva: 5 kVA | Primary voltage: 120 volts | Secondary voltage: 600 volts | Phase: Single-phase | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 1

    $661 USD
    British Columbia, Canada
  • Trusted Seller
    2002 DELTA CETC0075S001534

    2002 DELTA CETC0075S001534

    • Manufacturer: Delta
    • Phase type: Three-phase

    Kva: 75 kVA | Primary voltage: 600 volts | Secondary voltage: 208/120 volts | Phase: 3-phase | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 3R

    $2,368 USD
    British Columbia, Canada
  • Trusted Seller
    DELTA CDSC0007VHA6XXJA

    DELTA CDSC0007VHA6XXJA

    • Manufacturer: Delta
    • Phase type: Single-phase

    Kva: 7.5 kVA | Primary voltage: 600 volts | Secondary voltage: 208 volts | Phase: Single-phase | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 1

    $586 USD
    British Columbia, Canada
  • Trusted Seller
    DELTA EVI CETC0075-S001534

    DELTA EVI CETC0075-S001534

    • Manufacturer: Delta
    • Phase type: Three-phase

    Kva: 75 kVA | Primary voltage: 600 volts | Secondary voltage: 120/208 volts | Phase: 3-phase | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 3R

    $4,565 USD
    British Columbia, Canada

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.