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Used Isolation Transformers

  • Trusted Seller
    HPS "3 KVA" Transformer

    HPS "3 KVA" Transformer

    • Manufacturer: HPS
    • Phase type: Single-phase

    HPS "3 KVA" Transformer Phase: 1 PHASE | Voltage: 115/230 | Load out period: December 29, 2025 (By Appointment Only) | Estimated dimensions: See photos and description | Estimated weight: 100 lbs | Load fee: 10.00

    Tracy, CA
  • Trusted Seller
    Cooper Power Sys Eaton 3001861A01M

    Cooper Power Sys Eaton 3001861A01M Isolation Link, BON, Bent U, .020W X .010THK [New]

    • Manufacturer: Eaton
    • Model: Cooper Power

    . . . . . Eaton 3001861A01M Cooper Power Series Isolation Link, BON, Bent U, .020W X .010THK, No Arc Shortening Tab. Cooper Power Systems. Eaton. 3001861A01M.

    $69 USD
    Tempe, AZ
  • Allen Bradley 1321-3TH118-BB 118 KVA

    Allen Bradley 1321-3TH118-BB 118 KVA 460V 460Y/266V Drive Isolation Transformer

    • Manufacturer: Allen-Bradley

    Up for sale is used Allen Bradley 118 KVA transformer, model 1321-3TH118-BB. Three phase dry type drive isolation transformer. HV: 460V LV: 460Y/266V. Please see pictures of tag for specification. Can be seen in ...

    $2,500 USD
    Santa Clarita, CA
  • Allen Bradley 1321-3TH175-BB 175 KVA

    Allen Bradley 1321-3TH175-BB 175 KVA 460V 460Y/266V Drive Isolation Transformer

    • Manufacturer: Allen-Bradley

    Up for sale is used Allen Bradley 175 KVA transformer, model 1321-3TH175-BB. Three phase dry type drive isolation transformer. HV: 460V LV: 460Y/266V. Please see pictures of tag for specification. Can be seen in ...

    $3,500 USD
    Santa Clarita, CA
  • Trusted Seller
    CTE Series Automatic Transfer Switch

    CTE Series Automatic Transfer Switch

    • Manufacturer: Caterpillar

    Drive Mechanism Bypass Isolation Switches CBTED & CBTECT The Cat CTE Series power contactor type transfer switch makes use of a fully programmable/configurable microprocessor-based controller to allow the utmost ...

    Mesa, AZ
  • 15 KVA - 230V to

    15 KVA - 230V to 600Y/346V 3 Phase Isolation Transformer

      Brand: EVI Transformer | Model/serial: CD3A0015JVA6XXBB | High voltage: 230V | Low voltage: 600Y/346V | Kva: 15 | Phase: 3 | Weight: 140 lbs | Dimensions: 21 x 13 x 21 | St: 981-0307

      Edmonton, Canada
    • 10 KVA Transformer 480V to

      10 KVA Transformer 480V to 240/120V Isolation Transformer

        WxDxH (inch) ST# - 981-0195 High voltage: 480V | Low voltage: 240/120V | Kva: 10

        Edmonton, Canada
      • Hevi-Duty DT661H63S 63 kVA Shielded

        Hevi-Duty DT661H63S 63 kVA Shielded Drive Isolation Transformer

        • Manufacturer: Hevi-Duty

        $945 USD
        Eugene, OR
      • 48 KVA - 480V to

        48 KVA - 480V to 200V 3 Phase Isolation Transformer

          Brand: TR-T | High voltage: 480/200V | Low voltage: 220V | Kva: 48 | Phase: 3

          Edmonton, Canada
        • Trusted Seller
          Square D 15 kVA Transformer

          Square D 15 kVA Transformer

          • Manufacturer: Square D

          Volts: Amps: Includes Westinghouse 60 Amp Safety Switch :

          Savona, Canada
        • Trusted Seller
          Beaver 15 kVA Isolation Transformer

          Beaver 15 kVA Isolation Transformer

            Beaver 15 kVA Isolation Transformer. 3 phase. 60 Hz. Type 2 enclosure. Shipping information. Dimensions (L x W x H): 14 in. x 20 in. x 18 in. 36 cm x 51 cm x 46 cm. Weight: 200 lbs / 91 kg.

            Savona, Canada
          • Trusted Seller
            Rex 75kVA Isolation Transformer

            Rex 75kVA Isolation Transformer

            • Manufacturer: Rex Power Magnetics
            • Phase type: Three-phase

            Overall Dimensions: Kva: 75kVA | Primary voltage: 600 Volts | Secondary voltage: 208Y/120 Volts | Frequency: 60Hz | Phase: 3-Phase Isolation | Enclosure: NEMA 3R | Length: 27in | Width: 24in | Height: 32in

            Savona, Canada
          • Trusted Seller
            40kVA Beaver Isolation Transformer

            40kVA Beaver Isolation Transformer

            • Manufacturer: Beaver
            • Phase type: Three-phase

            Overall Dimensions: Primary voltage: 460 Volt | Style: Dry Type | Kva: 40kVA | Secondary voltage: 230Y/133 Volt | Frequency: 60Hz | Phase: 3-Phase | Width: 20in | Depth: 19in | Height: 25in

            Savona, Canada
          • Trusted Seller
            Rex 30kVA Isolation Transformer

            Rex 30kVA Isolation Transformer

            • Manufacturer: Rex Power Magnetics
            • Phase type: Three-phase

            Overall Dimensions: Kva: 30kVA | Primary voltage: 600 Volts | Secondary voltage: 208Y/120 Volts | Frequency: 60Hz | Phase: 3-Phase Isolation | Enclosure: NEMA 3R | Length: 24in | Width: 21in | Height: 27in

            Savona, Canada
          • Trusted Seller
            Rex 75kVA Isolation Transformer

            Rex 75kVA Isolation Transformer

            • Manufacturer: Rex Power Magnetics
            • Phase type: Three-phase

            Overall Dimensions: Kva: 75kVA | Primary voltage: 600 Volts | Secondary voltage: 208Y/120 Volts | Frequency: 60Hz | Phase: 3-Phase Isolation | Enclosure: Type 3R | Length: 25in | Width: 22in | Height: 32in

            Savona, Canada
          2122232425

          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.