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Used Isolation Transformers

  • Trusted Seller
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    Technicon Transformer, Isolation, Model PR161-B089-03F

      Lorton, VA
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      GE Drive Isolation Transformer

        GE Drive Isolation Transformer; 34KVA, 60Hz, 3 phase. 460 primary, 460 secondary. Dimensions 23in X 17.5in X 35in

        Dalton, GA
      • Trusted Seller
        REX POWER MAGNETICS CS1000BA

        REX POWER MAGNETICS CS1000BA

        • Manufacturer: Rex Power Magnetics

        o C o C Kva: 1 kVA | Primary voltage: 208 volts | Secondary voltage: 120 volts | Auto vs isolation: Isolation | Made in: CANADA | Class: 155 | Temp. rise: 95

        $262 USD
        British Columbia, Canada
      • Trusted Seller
        SQUARE D 9070TF100D37

        SQUARE D 9070TF100D37

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

        Kva: 0.1 kVA | Primary voltage: 550/575/60V | Secondary voltage: 110/115/120/220/230/240 | Phase: Single-phase | Auto vs isolation: Isolation

        $509 USD
        British Columbia, Canada
      • Trusted Seller
        HAMMOND POWER SOLUTIONS INC. NMT20K030KBK

        HAMMOND POWER SOLUTIONS INC. NMT20K030KBK

        • Manufacturer: Hammond
        • Phase type: Three-phase

        Kva: 30 kVA | Primary voltage: 480 volts | Secondary voltage: 208/120 volts | Phase: 3-phase | Auto vs isolation: Isolation | Oil vs dry: Dry

        $1,671 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

        $4,519 USD
        British Columbia, Canada
      • Trusted Seller
        HAMMOND MANUFACTURING 135667

        HAMMOND MANUFACTURING 135667

        • Manufacturer: Hammond
        • Phase type: Single-phase

        Kva: 6 kVA | Phase: Single-phase | Auto vs isolation: Auto | Oil vs dry: Dry | Primary voltage: 575/546V | Secondary voltage: 300V

        $302 USD
        British Columbia, Canada
      • Trusted Seller
        E.V.I CDTC0030VVC6XXBA

        E.V.I CDTC0030VVC6XXBA

        • Manufacturer: E.V.I
        • Phase type: Three-phase

        Kva: 30 kVA | Primary voltage: 600 volts | Secondary voltage: 600/347 volts | Phase: 3-phase | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 1

        $1,722 USD
        British Columbia, Canada
      • Trusted Seller
        E.V.I CDTC0030VVC6XXBA

        E.V.I CDTC0030VVC6XXBA

        • Manufacturer: E.V.I
        • Phase type: Three-phase

        Kva: 30 kVA | Primary voltage: 600 volts | Secondary voltage: 600/347 volts | Phase: 3-phase | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 1

        $1,722 USD
        British Columbia, Canada
      • Trusted Seller
        HAMMOND MANUFACTURING GX9P

        HAMMOND MANUFACTURING GX9P

        • Manufacturer: Hammond
        • Phase type: Single-phase

        Kva: 10 kVA | Primary voltage: 600 volts | Secondary voltage: 120/240 volts | Phase: Single-phase | Auto vs isolation: Isolation | Oil vs dry: Dry | Made in: CANADA

        $632 USD
        British Columbia, Canada
      • Trusted Seller
        BEMAG BC3080.5VZ5CB

        BEMAG BC3080.5VZ5CB

        • Manufacturer: BEMAG
        • Phase type: Three-phase

        Kva: 805 kVA | Primary voltage: 600 volts | Secondary voltage: 120/208 volts | Phase: 3-phase | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 1 | Made in: CANADA

        $2,180 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

        $2,344 USD
        British Columbia, Canada
      • Trusted Seller
        E.V.I CDTC0045VHC6XXBA

        E.V.I CDTC0045VHC6XXBA

        • Manufacturer: E.V.I
        • Phase type: Three-phase

        Kva: 45 kVA | Primary voltage: 600 volts | Secondary voltage: 120/208 volts | Phase: 3-phase | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 1

        $1,503 USD
        British Columbia, Canada
      • Trusted Seller
        E.V.I CDTC0045VVC6XXBA

        E.V.I CDTC0045VVC6XXBA

        • Manufacturer: E.V.I
        • Phase type: Three-phase

        Kva: 45 kVA | Primary voltage: 600 volts | Secondary voltage: 600/347 volts | Phase: 3-phase | Auto vs isolation: Isolation | Oil vs dry: Dry | Enclosure type: Nema 1

        $2,034 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

        $580 USD
        British Columbia, Canada
      2930313233

      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.