Current Transformers

Current transformers or (CT’s) are instruments that are used to transform the current from a high current into a lower current so that the power can then be used for measuring and controlling. The transformers consist of a core, a primary and a secondary winding.RS Components offer an extensive range of highly accurate CT’s in various transformer types, current ratings, CT ratio supply voltages and mounting types to suit every application. Supplied by industry-leading brands including Siemens, Murata Power Solutions LEM and of course RS PRO.

How does a current transformer work?

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.

Types of current transformer

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.

Where would I use a current transformer?

CT's are used in a wide range of industrial and commercial measurement applications. Some of the most common are:Generating stationsElectrical substationsCommercial electric power distributionElectrical panels


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Description Price Current Ratio Bore Size Transformer Type Sensor Technology Supply Voltage Input Current Output Current Overall Height Minimum Temperature Overall Width Maximum Temperature Overall Depth Dimensions For Use With
RS Stock No. 650-554
Mfr. Part No.CSLA1CD
BrandHoneywell
TWD907.00
Each
units
- 10.9mm - Open Loop 8 → 16 V dc - - - - - - - - -
RS Stock No. 177-5952
Mfr. Part No.CSLA1CD
BrandHoneywell
TWD650.10
Each (In a Tray of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 477-4711
Mfr. Part No.CSNS300M
BrandHoneywell
TWD5,416.00
Each
units
600:1 26mm - Closed Loop 15 V 600A 150 mA 61.2mm -40°C 67.5mm +85°C 19mm - -
RS Stock No. 181-2129
Mfr. Part No.CSLA2CD
BrandHoneywell
TWD737.00
Each
units
- 10.9mm - Open Loop 6 → 12 V dc - - - - - - - - -
RS Stock No. 181-2135
Mfr. Part No.CSLA2DG
BrandHoneywell
TWD1,164.00
Each
units
- 15.7mm - Open Loop 6 → 12 V dc - - - - - - - - -
RS Stock No. 169-7654
Mfr. Part No.CSLA2EL
BrandHoneywell
TWD1,414.60
Each (In a Box of 50)
units
- - - - 6 → 12 V dc - Maximum of 550 A 57.4mm -25°C 44.4mm +85°C 15.7mm - -
RS Stock No. 169-7652
Mfr. Part No.CSLA1CF
BrandHoneywell
TWD833.60
Each (In a Box of 50)
units
100:1 10.9mm - Open Loop 8 → 16 V dc 100A - 35.6mm -25°C 34.3mm +85°C 10.4mm - -
RS Stock No. 121-8178
Mfr. Part No.CSLA2EL
BrandHoneywell
TWD1,780.00
Each
units
20:1 - - - 6 → 12 V dc 20A Maximum of 550 A 57.4mm -25°C 44.4mm +85°C 15.7mm - -
RS Stock No. 169-7656
Mfr. Part No.CSLA2DK
BrandHoneywell
TWD1,246.00
Each (In a Box of 50)
units
- - - - 6 → 12 V dc - Maximum of 400 A 44.5mm -25°C 35.6mm +85°C 14.2mm - -
RS Stock No. 121-8179
Mfr. Part No.CSLA2DK
BrandHoneywell
TWD1,631.00
Each
units
20:1 - - - 6 → 12 V dc 20A Maximum of 400 A 44.5mm -25°C 35.6mm +85°C 14.2mm - -
RS Stock No. 650-560
Mfr. Part No.CSLA1CF
BrandHoneywell
TWD1,163.00
Each
units
- 10.9mm - Open Loop 8 → 16 V dc - - - - - - - - -
RS Stock No. 169-7681
Mfr. Part No.CSNE151-104
BrandHoneywell
TWD479.60
Each (In a Box of 40)
units
56:1 - - Closed Loop 15 V dc 56A 12.5 mA 20.3mm -40°C 31.75mm +75°C 12.7mm - -
RS Stock No. 667-3474
Mfr. Part No.CSNR151
BrandHoneywell
TWD1,933.00
Each
units
200:1 - - Closed Loop 12 → 15 V dc 200A 62.5 mA 29.6mm -40°C 36.6mm +85°C 14.45mm - -
RS Stock No. 667-3437
Mfr. Part No.CSDA1DA
BrandHoneywell
TWD893.00
Each
units
1:1 10.9mm - Open Loop 6 → 16 V dc 1A 20 mA 19mm -25°C 31.8mm +85°C 25.4mm - -
RS Stock No. 181-1429
Mfr. Part No.CSNT651
BrandHoneywell
TWD1,429.00
Each
units
150:1 12.5 x 9mm - Closed Loop 12 → 15 V dc 150A 25 mA 29.6mm -40°C 36.6mm +85°C 14.45mm - -
RS Stock No. 667-3459
Mfr. Part No.CSNE151-104
BrandHoneywell
TWD658.00
Each
units
56:1 - - Closed Loop 15 V dc 56A 12.5 mA 20.3mm -40°C 31.75mm +75°C 12.7mm - -
RS Stock No. 169-7653
Mfr. Part No.CSNA111
BrandHoneywell
TWD1,123.30
Each (In a Box of 30)
units
60 mA - - Closed Loop ±15 V 60mA -70 → +70 A 25.7mm 0°C 40.5mm +70°C 18mm - -
RS Stock No. 121-8175
Mfr. Part No.CSNA111
BrandHoneywell
TWD1,501.00
Each
units
60 mA - - Closed Loop ±15 V 60mA -70 → +70 A 25.7mm 0°C 40.5mm +70°C 18mm - -
RS Stock No. 121-8174
Mfr. Part No.CSLW6B200M
BrandHoneywell
TWD720.00
Each
units
9:1 - - - 4.5 → 10.5 V dc 9A -200 → +200 mA 10mm -25°C 16.2mm +100°C - - -
RS Stock No. 181-2141
Mfr. Part No.CSNP661
BrandHoneywell
TWD1,164.00
Each
units
90:1 - - Closed Loop 12 → 15 V dc 90A 50 mA 29.6mm -40°C 36.6mm +85°C 14.45mm - -