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Used controller in USA

  • SIEMENS,MT1000A,CONTROL TRANSFORMER 1000VA

    SIEMENS,MT1000A,CONTROL TRANSFORMER 1000VA

    • Manufacturer: Siemens
    • Model: MT1000A

    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 ...

    $115 USD
    Galion, OH
  • SIEMENS,MT1500A,CONTROL TRANSFORMER 1.5KVA 50/60HZ

    SIEMENS,MT1500A,CONTROL TRANSFORMER 1.5KVA 50/60HZ

    • Manufacturer: Siemens

    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 ...

    $100 USD
    Galion, OH
  • SIEMENS MT0050A Series 2 Control

    SIEMENS MT0050A Series 2 Control Transformer, 50VA. 4D-40

    • Manufacturer: Siemens

    Items are spares/engineering demo hookups that were pulled from an industrial working environment. We repair all types of industrial automation including AC Servo Drives, Servo Motors, Operator Interface Panels, ...

    $45 USD
    Duncan, SC
  • Siemens Setzermann C217-05 Current Transformer

    Siemens Setzermann C217-05 Current Transformer 4D

    • Manufacturer: Siemens

    Palmetto Automation Inc. of Duncan SC specializes in buying, selling, and repairing obsolete Used, Refurbished, and New industrial electronic equipment. Most of our used equipment goes through basic power bench t...

    $44 USD
    Duncan, SC
  • Trusted Seller
    Siemens 3F3Y045D16 Transformer 45KVA 480X120/208V

    Siemens 3F3Y045D16 Transformer 45KVA 480X120/208V Energy EFF N3R -T2076-WARRANTY

    • Manufacturer: Siemens

    THIS LISTING IS FOR ONE: SIEMENS 3F3Y045D16 DRY TYPE TRANSFORMER 45 KVA, 3 PHASE HIGH VOLTAGE 480 LOW VOLTAGE 120/208 NEW STYLE LABEL NEMA 3R ENCLOSURE, OUTDOOR RATED ENERGY EFFICENT WEIGHT: 470 LBS STOCK # T2076...

    $1,000 USD
    North Hampton, NH
  • Trusted Seller
    Siemens 3F3Y015CTP1 Transformer 15KVA 480X120/208V

    Siemens 3F3Y015CTP1 Transformer 15KVA 480X120/208V 3PH EE CU N3R -T2071-WARRANTY

    • Manufacturer: Siemens

    THIS LISTING IS FOR ONE: SIEMENS 3F3Y015CTP1 DRY TYPE TRANSFORMER 15 KVA, 3 PHASE PRIMARY VOLTAGE 480 SECONDARY VOLTAGE 120/208 NEMA 3R ENCLOSURE, OUTDOOR RATED ENERGY EFFICIENT, COPPER WINDINGS WEIGHT: 180 LBS A...

    $500 USD
    North Hampton, NH
  • Trusted Seller
    Siemens 112.5KVA Transformer 480V-208/120V 3-Phase

    Siemens 112.5KVA Transformer 480V-208/120V 3-Phase 3F3Y112ST -T50-WARRANTY

    • Manufacturer: Siemens

    THIS LISTING IS FOR ONE: SIEMENS 3F3Y112ST DRY TYPE TRANSFORMER 112.5 KVA, 3 PHASE HIGH VOLTAGE 480 LOW VOLTAGE 208/120 NEMA 1 ENCLOSURE NEW STYLE LABEL WEIGHT: 665 LBS STOCK # T50 USED, MAY HAVE KNOCKOUTS CLEANE...

    $1,500 USD
    North Hampton, NH
  • Trusted Seller
    Siemens 3F3Y030ST Transformer 30KVA 480X120/208

    Siemens 3F3Y030ST Transformer 30KVA 480X120/208 Volt 3 Phase -T917-WARRANTY

    • Manufacturer: Siemens

    THIS LISTING IS FOR ONE: SIEMENS 3F3Y030ST TRANSFORMER 30 KVA, 3 PHASE HIGH VOLTAGE 480 LOW VOLTAGE 120/208 NEMA 1 ENCLOSURE NEW STYLE LABEL WEIGHT: 240 LBS STOCK # T917 USED, MAY HAVE KNOCKOUTS CLEANED, INSPECTE...

    $500 USD
    North Hampton, NH

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.