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. 175-6202
Mfr. Part No.4NC5432-2DH21
BrandSiemens
£74.34
Each
Units
1000:5 64mm Window - - 1000A 5 A 84.1mm -30°C 112mm +55°C 127.5mm 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices
RS Stock No. 175-6123
Mfr. Part No.3UL2303-1A
BrandSiemens
£117.98
Each
Units
40:1 - Toroidal Ring - - 40A 150 A 64mm -25°C 92mm +60°C 98mm 92 x 98 x 64 mm Fault Current Monitoring
RS Stock No. 136-6365
Mfr. Part No.XM22-375131S000000
£21.76
Each
Units
800:5 72mm - - - 800A 5 A 104mm - 104mm - 45mm 104 x 45 x 104 mm -
New
RS Stock No. 216-9752
Mfr. Part No.CAS5050SAA-LI
BrandSensitec
£12.41
Each
Units
0.625694444 1mm - - 5 V 50A - 23mm - 22.9mm - - - -
RS Stock No. 198-4502
Mfr. Part No.METSECT5MC030
£65.00
Each
Units
300:5 32mm Tropicalise - - 300A 5 A 95mm -25°C 70mm +60°C 65mm - -
RS Stock No. 175-6166
Mfr. Part No.4NC5224-0CE21
BrandSiemens
£47.20
Each
Units
300:1 - Window - - 300A 1 A 67.6mm -30°C 60.6mm +55°C 78.4mm 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices
RS Stock No. 175-6208
Mfr. Part No.4NC5435-0DH21
BrandSiemens
£100.26
Each
Units
1500:1 - Window - - 1500A 1 A 84.1mm -30°C 112mm +55°C 127.5mm 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices
RS Stock No. 198-4461
Mfr. Part No.METSECT5CC004
£37.00
Each
Units
40:5 21mm Tropicalise - - 40A 5 A 65mm -25°C 44mm +60°C 37mm - -
RS Stock No. 200-3814
Mfr. Part No.LESR 15-NP KIT 3P
BrandLEM
£18.93
Each
Units
15:1 - - Closed Loop +5 V 15A - - - - - - - -
RS Stock No. 198-4478
Mfr. Part No.METSECT5DC200
£132.00
Each
Units
2000:5 - Tropicalise - - 2000A 5 A 160mm -25°C 125mm +50°C 87mm - -
RS Stock No. 175-6140
Mfr. Part No.4NC5121-0CC21
BrandSiemens
£47.20
Each
Units
150:1 - Window - - 150A 1 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS Stock No. 180-9998
Mfr. Part No.MR-2
BrandKEMET
£6.97
Each (In a Box of 80)
Units
- 8.9mm - - - - - - - - - - - -
RS Stock No. 122-0549
Mfr. Part No.48290502
BrandSocomec
£29.88
Each
Units
- - - - - - - - -10°C - +70°C - 65 x 25 x 32.5 mm DIRIS B-30, DIRIS Digiware
New
RS Stock No. 216-9751
Mfr. Part No.CAS5050SAA-LI
BrandSensitec
£9.752
Each (In a Tray of 350)
Units
0.625694444 1mm - - 5 V 50A - 23mm - 22.9mm - - - -
RS Stock No. 175-6165
Mfr. Part No.4NC5223-2DE21
BrandSiemens
£49.45
Each
Units
250:5 - Window - - 250A 5 A 67.6mm -30°C 60.6mm +55°C 78.4mm 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices
RS Stock No. 175-6207
Mfr. Part No.4NC5435-0CH21
BrandSiemens
£91.39
Each
Units
1500:1 - Window - - 1500A 1 A 84.1mm -30°C 112mm +55°C 127.5mm 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices
RS Stock No. 181-0075
Mfr. Part No.MR-1
BrandKEMET
£4.85
Each
Units
- 7.2mm - - - - - - - - - - - -
RS Stock No. 198-4477
Mfr. Part No.METSECT5DB300
£134.00
Each
Units
3000:5 - Tropicalise - - 3000A 5 A 160mm -25°C 99mm +60°C 78.4mm - -
RS Stock No. 180-9997
Mfr. Part No.MR-1
BrandKEMET
£4.759
Each (In a Box of 80)
Units
- 7.2mm - - - - - - - - - - - -
RS Stock No. 175-6164
Mfr. Part No.4NC5223-2CE21
BrandSiemens
£42.76
Each
Units
250:5 - Window - - 250A 5 A 67.6mm -30°C 60.6mm +55°C 78.4mm 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices