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. 715-7068
Mfr. Part No.56050C
€1.44
Each
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS Stock No. 106-8534
Mfr. Part No.56050C
€1.307
Each (In a Tube of 25)
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS Stock No. 715-7061
Mfr. Part No.56100C
€1.47
Each
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS Stock No. 106-8532
Mfr. Part No.56100C
€1.34
Each (In a Tube of 25)
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS Stock No. 715-7080
Mfr. Part No.56T300C
€1.47
Each
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS Stock No. 715-7055
Mfr. Part No.54100C
€2.11
Each
units
- - - - - - 15A - -40°C +125°C 10.8 x 9 x 8.2 mm - Surface Mount -
RS Stock No. 106-8536
Mfr. Part No.56300C
€1.34
Each (In a Tube of 25)
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS Stock No. 106-8533
Mfr. Part No.56200C
€1.34
Each (In a Tube of 25)
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS Stock No. 715-7037
Mfr. Part No.53100C
€1.59
Each
units
- - - - - - 10A - -40°C +125°C 8.3 x 7.2 x 5.4 mm - Surface Mount -
RS Stock No. 715-7071
Mfr. Part No.56T200C
€1.47
Each
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS Stock No. 715-7049
Mfr. Part No.53150C
€0.65
Each
units
- - - - - - 10A - -40°C +125°C 8.3 x 7.2 x 5.4 mm - Surface Mount -
RS Stock No. 715-7074
Mfr. Part No.56300C
€1.47
Each
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS Stock No. 715-7065
Mfr. Part No.56200C
€1.47
Each
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS Stock No. 170-9247
Mfr. Part No.53030C
€0.774
Each (On a Reel of 1000)
units
- - - - - - 10A - -40°C +125°C 8.3 x 7.2 x 5.4 mm - Surface Mount -
RS Stock No. 106-8538
Mfr. Part No.56T300C
€1.34
Each (In a Tube of 25)
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS Stock No. 106-8528
Mfr. Part No.53150C
€0.632
Each (On a Reel of 1000)
units
- - - - - - 10A - -40°C +125°C 8.3 x 7.2 x 5.4 mm - Surface Mount -
RS Stock No. 106-8537
Mfr. Part No.56T100C
€1.34
Each (In a Tube of 25)
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS Stock No. 715-7043
Mfr. Part No.53200C
€1.49
Each
units
- - - - - - 10A - -40°C +125°C 8.3 x 7.2 x 5.4 mm - Surface Mount -
RS Stock No. 106-8816
Mfr. Part No.53100C
€0.76
Each (On a Reel of 1000)
units
- - - - - - 10A - -40°C +125°C 8.3 x 7.2 x 5.4 mm - Surface Mount -
RS Stock No. 106-8535
Mfr. Part No.56T200C
€1.34
Each (In a Tube of 25)
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -