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Used Square D Isolation Transformers

  • Trusted Seller
    SQUARE D LA9TFD32X

    SQUARE D LA9TFD32X

    • Manufacturer: Square D
    • Phase type: Three-phase

    Fuses: Bussmann time-delay 600Vac FNQ-R-1/4 x 2 Bussmann time-delay 500Vac FNQ-6/10 x 1

    $385 USD
    British Columbia, Canada
  • Trusted Seller
    2006 SQUARE D EE112T65H

    2006 SQUARE D EE112T65H

    • Manufacturer: Square D
    • Phase type: Three-phase

    Kva: 112.5 kVA | Primary voltage: 600 volts | Secondary voltage: 120/208 volts | Phase: 3-phase | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 2

    $3,936 USD
    British Columbia, Canada
  • Trusted Seller
    2008 SQUARE D EE45T65HCU

    2008 SQUARE D EE45T65HCU

    • Manufacturer: Square D
    • Phase type: Three-phase

    Kva: 45 kVA | Primary voltage: 600 volts | Secondary voltage: 208/120 volts | Phase: 3-phase | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 2

    $1,530 USD
    British Columbia, Canada
12

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.