Current Transformers

Current transformers (CT) are devices that are used to transform the current from a high current into a lower current so that the power can then be measured and controlled. The transformers consist of a core, a primary and a secondary winding. When an alternating current flows through the primary winding, a magnetic flux is created which then induces an alternating current in the secondary winding. This alternating current is proportional to the current in its primary. Current transformers are also known as a "step-down transformers". Once the current has been reduced it can be safely monitored and measured using an ammeter.


Current transformers can perform circuit control and perform roles for safety protection and current limiting.


Current transformers are found in:


  • Generating stations,

  • Electrical substations

  • Commercial electric power distribution.

Types of Current Transformers


Toroidal Current Transformer - These transformers are shaped like a doughnut they do not contain a primary winding. Instead, the line that carries the current flowing in the network is threaded through a window or hole in the toroidal transformer. Toroidal transformers offer high efficiency with minimal excess noise and little excess leakage inductance.


Wound Current Transformer - The transformers primary winding is physically connected in series with the conductor that carries the measured current flowing in the circuit. The magnitude of the secondary current is dependent on the turns ratio of the transformer.


Bar-type Current Transformer – This type of current transformer uses the actual cable or bus-bar of the main circuit as the primary winding, which is equivalent to a single turn. They are fully insulated from the high operating voltage of the system and are usually bolted to the current carrying device.


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Description Price Current Ratio Inner Diameter Transformer Type Overall Height Overall Width Overall Depth Input Current Output Current Minimum Temperature Maximum Temperature Dimensions For Use With Mounting Type Series
RS Stock No. 174-3475
Mfr. Part No.1033483
$631.80
Each
units
- 8.3mm Rogowski Coil 85.00mm 22.5mm 70.4mm - 1 A -20°C +80°C 85.00 x 22.50 x 70.40 mm - DIN Rail PACT RCP
RS Stock No. 175-0491
Mfr. Part No.2906235
$607.29
Each
units
- - DIN Rail Mounted 110.5mm 120.5mm 6.2mm 1 kA, 1.5 kA, 2 kA, 4 kA, 100 A, 250 A, 400 A, 630 A 0 → 10 mA, 0 → 20 mA, 0 → 21 mA, 2 → 10 mA, 4 → 20 mA -40 °C, -30 °C +70 °C, +80 °C 6.2 x 120.5 x 110.5 mm Retrofitting DIN Rail PACT RCP
RS Stock No. 174-3477
Mfr. Part No.1033485
$816.65
Each
units
- - DIN Rail Mounted 70.4mm 22.5mm 85mm 1 kA, 1.5 kA, 2 kA, 4 kA, 100 A, 250 A, 400 A, 630 A 0 → 1 A -30 °C, -20 °C +70 °C, +80 °C 22.5 x 85 x 70.4 mm Retrofitting DIN Rail PACT RCP
RS Stock No. 174-3482
Mfr. Part No.2906231
$607.29
Each
units
- - DIN Rail Mounted 120.5mm 6.2mm 110.5mm 1 kA, 1.5 kA, 2 kA, 4 kA, 100 A, 250 A, 400 A, 630 A 0 → 21 mA -40 °C, -30 °C +70 °C, +80 °C 6.2 x 110.5 x 120.5 mm Retrofitting DIN Rail PACT RCP
RS Stock No. 174-3476
Mfr. Part No.2910327
$575.33
Each
units
- - DIN Rail Mounted 70.4mm 22.5mm 85mm 1 kA, 1.5 kA, 2 kA, 4 kA, 100 A, 250 A, 400 A, 630 A 0 → 1 A -30 °C, -20 °C +70 °C, +80 °C 22.5 x 85 x 70.4 mm Retrofitting DIN Rail PACT RCP
RS Stock No. 174-3479
Mfr. Part No.2910325
$559.35
Each
units
- - DIN Rail Mounted 70.4mm 22.5mm 85mm 1 kA, 1.5 kA, 2 kA, 4 kA, 100 A, 250 A, 400 A, 630 A 0 → 1 A -30 °C, -20 °C +70 °C, +80 °C 22.5 x 85 x 70.4 mm Retrofitting DIN Rail PACT RCP
RS Stock No. 175-0492
Mfr. Part No.2906236
$607.29
Each
units
- - DIN Rail Mounted 110.5mm 120.5mm 6.2mm 1 kA, 1.5 kA, 2 kA, 4 kA, 100 A, 250 A, 400 A, 630 A 0 → 10 mA, 0 → 20 mA, 0 → 21 mA, 2 → 10 mA, 4 → 20 mA -40 °C, -30 °C +70 °C, +80 °C 6.2 x 120.5 x 110.5 mm Retrofitting DIN Rail PACT RCP
RS Stock No. 174-3481
Mfr. Part No.2906233
$607.29
Each
units
- - DIN Rail Mounted 120.5mm 6.2mm 110.5mm 1 kA, 1.5 kA, 2 kA, 4 kA, 100 A, 250 A, 400 A, 630 A 0 → 21 mA -40 °C, -30 °C +70 °C, +80 °C 6.2 x 110.5 x 120.5 mm Retrofitting DIN Rail PACT RCP
RS Stock No. 174-3480
Mfr. Part No.2906232
$607.29
Each
units
- - DIN Rail Mounted 120.5mm 6.2mm 110.5mm 1 kA, 1.5 kA, 2 kA, 4 kA, 100 A, 250 A, 400 A, 630 A 0 → 21 mA -40 °C, -30 °C +70 °C, +80 °C 6.2 x 110.5 x 120.5 mm Retrofitting DIN Rail PACT RCP
RS Stock No. 174-3478
Mfr. Part No.2910326
$575.33
Each
units
- - DIN Rail Mounted 70.4mm 22.5mm 85mm 1 kA, 1.5 kA, 2 kA, 4 kA, 100 A, 250 A, 400 A, 630 A 0 → 1 A -30 °C, -20 °C +70 °C, +80 °C 22.5 x 85 x 70.4 mm Retrofitting DIN Rail PACT RCP
RS Stock No. 175-0493
Mfr. Part No.2906234
$607.29
Each
units
- - DIN Rail Mounted 110.5mm 120.5mm 6.2mm 1 kA, 1.5 kA, 2 kA, 4 kA, 100 A, 250 A, 400 A, 630 A 0 → 10 mA, 0 → 20 mA, 0 → 21 mA, 2 → 10 mA, 4 → 20 mA -40 °C, -30 °C +70 °C, +80 °C 6.2 x 120.5 x 110.5 mm Retrofitting DIN Rail PACT RCP