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Used Square D Current Transformer (Ct) in USA

  • SQUARE D,5NR-301,CURRENT TRANSFORMER 300:5 RATIO

    SQUARE D,5NR-301,CURRENT TRANSFORMER 300:5 RATIO NOS

    • Manufacturer: Square D

    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 ...

    $25 USD
    Galion, OH
  • Square D,5NR-501,Current Transformer Ratio 500:5

    Square D,5NR-501,Current Transformer Ratio 500:5 600V 50-400HZ

    • Manufacturer: Square D

    New unused without original box NOS. Please see pictures for details and condition. You will receive what’s in the pictures. If we have multiples of the same item, the pictures may differ. Please review the pictu...

    $80 USD
    Galion, OH
  • Trusted Seller
    SQUARE D 9070TF500D18 TRANSFORMER ($200

    SQUARE D 9070TF500D18 TRANSFORMER ($200 OBO)

    • Manufacturer: Square D

    SQUARE D 9070TF500D18 TRANSFORMER ***Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Please provide your delivery instructions (address, time of deli...

    $200 USD
    Waukesha, WI
  • Trusted Seller
    Square D Transformer, Dry Type

    Square D Transformer, Dry Type Distribution

    • Manufacturer: Square D

    Square D Transformer, Dry Type Distribution EX300T1769H. Condition is "New" Construction Site Surplus. Due to a change in plan this transformer is now surplus and no longer needed. Up for sale at heavy discount ...

    $15,750 USD

    Get financing

    Est. $309/mo

    Neenah, WI
  • Trusted Seller
    Square D 6353C97H01 Current Transformer

    Square D 6353C97H01 Current Transformer 50:5 Ratio Used

    • Manufacturer: Square D

    This is a used Square D Current Transformer. Save thousands and buy used from Green Industrial today! Ratio: 50:5

    $275 USD
    Belgium, WI
  • Trusted Seller
    75KVA Square D General Purpose

    75KVA Square D General Purpose Transformer 480x480

    • Manufacturer: Square D

    Cat No. 75T76H, HV: 480, LV:480, Weight: 500lb; *Handling times for freight shipments average 5 days, but may vary depending on size, weight, location, and current trucking conditions. This does not include shipp...

    Shippensburg, PA
  • Trusted Seller
    Square D Control Transformer 150Va

    Square D Control Transformer 150Va 480380(S6LLST8654)

    • Manufacturer: Square D

    *Handling times for freight shipments average 5 days, but may vary depending on size, weight, location, and current trucking conditions. This does not include shipping time.* Looking for a reliable transformer? T...

    Shippensburg, PA
  • SQUARE D 112T3H

    SQUARE D 112T3H

    • Manufacturer: Square D
    • Model: 112T3H
    • Phase type: Three-phase

    Used 112.5 KVA Square D Sorgel Transformer, Model 112T3H. 3 Phase, 480V to 208Y/120V. Natural convection cooling, copper coil, 60Hz frequency. 47dB sound level, dimensions: 37.5"x28.4"x31.3". Weighs 665 lbs, floo...

    $7,875 USD

    Get financing

    Est. $155/mo

    Louisville, KY
  • Trusted Seller
    Square D 30KVA Dry Type

    Square D 30KVA Dry Type Transformer 480v x 208/120

    • Manufacturer: Square D

    Cat No. 30T3HB, 30KVA, HV: 480, LV: 208Y/120, Weight: 370lb *Handling times for freight shipments average 5 days, but may vary depending on size, weight, location, and current trucking conditions. This does not i...

    Shippensburg, PA
  • Square D 9070TF100D1 Transformer. Loc4D-25

    Square D 9070TF100D1 Transformer. Loc4D-25

    • Manufacturer: Square D

    Square D 9070TF100D1 Transformer. Loc4D-25* We repair all types of industrial automation including AC Servo Drives, Servo Motors, Operator Interface Panels, PLC's, Sensors, Process Controls and Timers. Palmet...

    $83 USD
    Duncan, SC
  • Square D EE75T3022HB TRANSFORMER

    Square D EE75T3022HB TRANSFORMER

    • Manufacturer: Square D

    Unused transformer prefer local pick but will assist buyer with loading and shipping at buyers expense. Also for sale locally.

    $2,500 USD
    Piedmont, SC
  • Trusted Seller
    3750/5000KVA Square D PowerDry II

    3750/5000KVA Square D PowerDry II Sorgel Transformer 12470V x 480/277v

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

    Manufacturer: Square D Model: POWER DRY II SORGEL TRANSFORMER Serial No.: 24036700-003-01 kVA (Kilovolt-Amperes): 3750/5000 (This indicates it's a 3750 kVA transformer with natural air cooling and 5000 kVA with f...

    Shippensburg, PA
  • Trusted Seller
    Pickup Only Square D Industrial

    Pickup Only Square D Industrial Control Transformer 9070T150Q24253(S6LLST8706)

    • Manufacturer: Square D

    *This item is PICKUP ONLY from our Shippensburg PA warehouse* *Handling times for freight shipments average 5 days, but may vary depending on size, weight, location, and current trucking conditions. This does not...

    Shippensburg, PA
  • Trusted Seller
    Square D 225KVA 480-208Y/120 3PH

    Square D 225KVA 480-208Y/120 3PH Transformer 225T3HNV (SKU: 111882)

    • Manufacturer: Square D

    *Handling times for freight shipments average 5 days, but may vary depending on size, weight, location, and current trucking conditions. This does not include shipping time.* Please be aware that item descriptio...

    Shippensburg, PA
  • Trusted Seller
    Square D 30KVA Dry Type

    Square D 30KVA Dry Type Transformer 480/208/120 30T3HFISNL(S6LLST2446)

    • Manufacturer: Square D

    *Handling times for freight shipments average 5 days, but may vary depending on size, weight, location, and current trucking conditions. This does not include shipping time.* Power up your operations with the dep...

    Shippensburg, PA
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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.