Current Transformers
A current transformer is an instrument transformer that steps the high current flowing through its primary down at a fixed ratio to a standard secondary current such as 5 A and isolates the measuring circuit from the power circuit. It is used in low-voltage panels so that ammeters, energy analyzers, meters and reactive power relays can take measurements from a high-current busbar or cable. In this category, busbar-type, cable-type and split-core current transformers from brands such as Entes, Schneider Electric, ABB and Siemens are available in primary currents such as 250 A, 400 A, 600 A and 1250 A, in rated outputs such as 5 VA, 10 VA and 15 VA, in sealed and unsealed types. Choose the primary current by the operating current of the line, the window size by the busbar or cable dimensions, the rated output (VA) by the burden of the connected device and the secondary cable, and the accuracy class by the purpose of the measurement. Toroidal transformers used with residual current relays are also listed in this category. Because a measuring-class current transformer is designed to saturate at fault current, it is not a substitute for a protection-class current transformer in a protection relay circuit.
Products
- Tense AT-300 Low Voltage Current Transformer, 300/5, 30 x 10 mm — Tense · SKU: AT-300 · TRY 583.44 · In stock
- Tense AT-500 Low Voltage Current Transformer, 500/5, 40 x 10 mm — Tense · SKU: AT-500 · TRY 583.44 · In stock
- Tense OG-AT/100 MV Toroidal Current Transformer, 100 A, 5 A — Tense · SKU: OG-AT/100 · TRY 6,067.72 · In stock
- Tense AT-400 Low Voltage Current Transformer, 400/5, 40 x 10 mm — Tense · SKU: AT-400 · TRY 583.44 · In stock
- Tense OG-AT/40 MV Toroidal Current Transformer, 40 A, 1 A — Tense · SKU: OG-AT/40 · TRY 6,067.72 · In stock
- Siemens 7KT1261 Data Manager, up to 96 load outputs — Siemens · SKU: 7KT1261 · TRY 78,352.00 · Made to order
- Tense AT-250 Low Voltage Current Transformer, 250/5, 30 x 10 mm — Tense · SKU: AT-250 · TRY 560.10 · In stock
- Schneider Electric METSECTV35025 LVCT 1/3V 3in1 RJ45 Current Transformer - 35mm, 250A — Schneider Electric · SKU: METSECTV35025 · TRY 7,628.28 · Made to order
- Schneider Electric METSECT5MC030 Current Transformer - MC Type, 32mm 300 A — Schneider Electric · SKU: METSECT5MC030 · TRY 2,229.55 · Made to order
- Schneider Electric METSECT5DB150 Current Transformer - dB Type, 38x27, 1500 A — Schneider Electric · SKU: METSECT5DB150 · TRY 7,161.24 · Made to order
- Schneider Electric METSECT5DE200 Current Transformer - DE Type, 54x102, 2000 A — Schneider Electric · SKU: METSECT5DE200 · TRY 7,094.52 · Made to order
- Schneider Electric METSECT5CC010 Current Transformer - CC Type, 21mm 100 A — Schneider Electric · SKU: METSECT5CC010 · TRY 1,562.35 · Made to order
- Schneider Electric METSECT5MC080 Current Transformer - MC Type, 32mm 800 A — Schneider Electric · SKU: METSECT5MC080 · TRY 3,085.78 · Made to order
- Schneider Electric METSECT5VV600 Current Transformer - VV Type, 55x165, 6000 A — Schneider Electric · SKU: METSECT5VV600 · TRY 51,874.52 · Made to order
- Schneider Electric METSECT5DB250 Current Transformer - dB Type, 38x27, 2500 A — Schneider Electric · SKU: METSECT5DB250 · TRY 8,312.16 · Made to order
- Schneider Electric METSECT5DD100 Current Transformer - DD Type, 34x84, 1000 A — Schneider Electric · SKU: METSECT5DD100 · TRY 5,131.85 · Made to order
- Schneider Electric METSECT5DB125 Current Transformer - dB Type, 38x27, 1250 A — Schneider Electric · SKU: METSECT5DB125 · TRY 6,955.52 · Made to order
- Schneider Electric METSECT5DC250 Current Transformer - DC Type, 52x127, 2500 A — Schneider Electric · SKU: METSECT5DC250 · TRY 8,506.75 · Made to order
- Schneider Electric METSECT5DA050 Current Transformer - DAType, 32x65, 500 A — Schneider Electric · SKU: METSECT5DA050 · TRY 3,424.94 · Made to order
- Schneider Electric LV481013 Closed Toroid VigiPact B Type TB120mm — Schneider Electric · SKU: LV481013 · TRY 116,147.77 · Made to order
- Schneider Electric METSECT5MC060 Current Transformer - MC Type, 32mm 600 A — Schneider Electric · SKU: METSECT5MC060 · TRY 2,768.87 · Made to order
- Schneider Electric METSECT5MC050 Current Transformer - MC Type, 32mm 500 A — Schneider Electric · SKU: METSECT5MC050 · TRY 2,362.99 · Made to order
- Schneider Electric METSECT5MA020 Current Transformer - MA Type, 27mm 200 A — Schneider Electric · SKU: METSECT5MA020 · TRY 1,745.83 · Made to order
- Schneider Electric METSECT5DB200 Current Transformer - dB Type, 38x27, 2000 A — Schneider Electric · SKU: METSECT5DB200 · TRY 7,311.36 · Made to order
- Schneider Electric METSECT5DH200 Current Transformer - DH Type, 38x102, 2000 A — Schneider Electric · SKU: METSECT5DH200 · TRY 7,094.52 · Made to order
How to choose Current Transformers
A current transformer is an instrument transformer that steps the high current flowing through its primary down at a fixed ratio to a standard secondary current such as 5 A and isolates the measuring circuit from the power circuit. It is used in low-voltage panels so that ammeters, energy analyzers, meters and reactive power relays can take measurements from a high-current busbar or cable.
- Take reactive power demand and harmonic distortion levels from site measurements or project calculations.
- Compare kVAr step sizes, rated voltage and step count against the compensation panel layout.
- Select capacitor duty contactors, harmonic filter reactors and discharge resistors together with the capacitor bank.
Frequently asked questions
What is Current Transformers and where is it used?
A current transformer is an instrument transformer that steps the high current flowing through its primary down at a fixed ratio to a standard secondary current such as 5 A and isolates the measuring circuit from the power circuit. It is used in low-voltage panels so that ammeters, energy analyzers, meters and reactive power relays can take measurements from a high-current busbar or cable.
What should I compare when choosing Current Transformers?
Choose the primary current by the operating current of the line, the window size by the busbar or cable dimensions, the rated output (VA) by the burden of the connected device and the secondary cable, and the accuracy class by the purpose of the measurement.
Where can I find technical details for Current Transformers products?
Because a measuring-class current transformer is designed to saturate at fault current, it is not a substitute for a protection-class current transformer in a protec