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Used instruments in Ohio, USA

  • INSTRUMENT TRANSFORMER,AL-101,CURRENT TRANSFORMER NOS

    INSTRUMENT TRANSFORMER,AL-101,CURRENT TRANSFORMER NOS

    • Manufacturer: INSTRUMENT TRANSFORMER

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $35 USD
    Galion, OH
  • E.I.L INSTRUMENTS,5-RL-201,CURRENT TRANSFORMER 5-400HZ 600V

    E.I.L INSTRUMENTS,5-RL-201,CURRENT TRANSFORMER 5-400HZ 600V RATIO 200:5 A NOS

    • Manufacturer: E.I.L INSTRUMENTS

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $35 USD
    Galion, OH
  • WESTON INSTRUMENTS,605,CURRENT TRANSFORMER NOS

    WESTON INSTRUMENTS,605,CURRENT TRANSFORMER NOS

    • Manufacturer: WESTON INSTRUMENTS

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $20 USD
    Galion, OH
  • INSTRUMENTS INC,2SFT-750,CURRENT TRANSFORMER LOT OF

    INSTRUMENTS INC,2SFT-750,CURRENT TRANSFORMER LOT OF 8

    • Manufacturer: INSTRUMENTS INC

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $40 USD
    Galion, OH
  • Instrument Transformers,8SHT-601,Current Transformer Ratio 600.5A

    Instrument Transformers,8SHT-601,Current Transformer Ratio 600.5A Lot of 3

    • Manufacturer: Instrument Transformers

    Used. Part was pulled from operation upon factory shutdown. This item has been stored in an inventory cabinet since being pulled. Please see pictures for details and condition. You will receive what’s in the pict...

    $72 USD
    Galion, OH

Overview

Current transformers (CTs) convert high alternating currents into a scaled secondary current for meters, relays and protection systems. Available as window, wound or bar types, CTs vary by ratio, accuracy class and saturation behavior. Proper selection focuses on rated primary current, burden, insulation, knee-point for protection use, and condition when buying used for substations, switchgear, or industrial panels.

FAQ

What should I check when buying a used CT?

Verify the nameplate ratio and accuracy class, inspect for physical damage or oil leaks, request recent ratio and insulation test reports, and confirm the CT type (wound/window/bar) and its knee-point if used for protection.

How should a CT be prepared and shipped safely?

Drain and seal oil-filled CTs if required, protect bushings and cores, short and ground the secondary terminals, secure the unit to prevent shock, and use a carrier experienced with electrical equipment plus insurance.

What routine maintenance and tests are essential for CTs?

Perform visual inspections, insulation resistance tests, ratio and polarity checks, check for oil contamination on liquid-filled units, and schedule periodic accuracy and dielectric tests per manufacturer guidelines.