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. 913-9734
Mfr. Part No.METSECT5CC013
kr 364,00
Each
Units
125:5 21mm Toroidal Ring - - - - - -25°C +60°C 65 x 44 x 30 mm - DIN Rail -
RS Stock No. 832-9848
Mfr. Part No.L01-8506
BrandAlttec
kr 205,54
Each
Units
100:5 28mm Clip Fit 78.5mm 61mm 40mm - - - +40°C 78.5 x 61 x 72 mm - - -
RS Stock No. 775-4947
Mfr. Part No.AP-1500
kr 25,32
Each
Units
- - - - - - 10A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS Stock No. 175-6158
Mfr. Part No.4NC5222-0CE21
BrandSiemens
kr 709,86
Each
Units
200:1 30mm Window 67.6mm 60.6mm 78.4mm 200A 1 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 331-531
Mfr. Part No.CT132M300/5-2.5/0.5
BrandHOBUT
kr 177,77
Each
Units
300:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
RS Stock No. 914-5354
Mfr. Part No.175-5-H6
BrandHOBUT
kr 304,58
Each
Units
- 40mm - - - - - - -30°C +85°C 70 x 55 x 95 mm - Foot Series 17
RS Stock No. 175-6156
Mfr. Part No.4NC5125-2FE21
BrandSiemens
kr 697,78
Each
Units
300:5 - Window 65.6mm 60mm 75.3mm 300A 5 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6196
Mfr. Part No.4NC5431-0DH21
BrandSiemens
kr 1 178,06
Each
Units
800:1 - Window 84.1mm 112mm 127.5mm 800A 1 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 832-9876
Mfr. Part No.L01-8007
BrandAlttec
kr 124,13
Each
Units
200:5 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
RS Stock No. 173-0066
Mfr. Part No.AZ-0500
kr 41,969
Each (In a Box of 84)
Units
- - - - - - 25A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS Stock No. 886-2134
Mfr. Part No.XM02-285081S000000
kr 122,79
Each
Units
300:5 21mm Base Mounted - - - - - - - 45 x 40 x 65 mm - Surface Mount Omega XMER
RS Stock No. 832-9835
Mfr. Part No.L01-8500
BrandAlttec
kr 242,79
Each
Units
40:5 28mm Clip Fit 78.5mm 61mm 40mm - - - +40°C 78.5 x 61 x 72 mm - - -
RS Stock No. 136-6363
Mfr. Part No.XM07-285081S000000
kr 112,47
Each
Units
300:5 26mm - 70mm 50mm 44.5mm 300A 5 A - - 50 x 44.5 x 70 mm - BusBar, Cable Mount, DIN Rail, Wall Mount Omega
RS Stock No. 175-6125
Mfr. Part No.3UL2305-1A
BrandSiemens
kr 2 462,59
Each
Units
- - Toroidal Ring 64mm 163mm 169mm 30 mA → 40 A 400 A -25°C +60°C 163 x 169 x 64 mm Fault Current Monitoring Chassis Mount -
New
RS Stock No. 198-4479
Mfr. Part No.METSECT5DC250
kr 1 587,08
Each
Units
2500:5 - Tropicalise 160mm 125mm 87mm 2.5kA 5 A -25°C +50°C - - Surface Mount -
RS Stock No. 175-6198
Mfr. Part No.4NC5431-2DH21
BrandSiemens
kr 1 097,52
Each
Units
800:5 - Window 84.1mm 112mm 127.5mm 800A 5 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 291-1227
Mfr. Part No.01.000158.221
BrandABB
kr 471,35
Each
Units
- 26mm - 82mm 80mm 38mm - - -10°C +60°C - - - -
RS Stock No. 914-5301
Mfr. Part No.CTSCMWH500/0.333V
BrandHOBUT
kr 405,98
Each
Units
- 35mm Split Core - - - 500A 333 mV -15°C +50°C 51.2 x 51.2 x 83.5 mm Multi Function Meter Cable -
RS Stock No. 175-6201
Mfr. Part No.4NC5432-2CH21
BrandSiemens
kr 1 319,03
Each
Units
1000:1 - Window 84.1mm 112mm 127.5mm 1kA 1 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 106-8538
Mfr. Part No.56T300C
kr 13,484
Each (In a Tube of 25)
Units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
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