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. 881-7994
Mfr. Part No.CTMAX400SELV
BrandABB
€37.24
Each
units
- 30mm - - - - - - -5°C +50°C 70 x 111 x 69 mm - BusBar, DIN Rail CT MAX SELV
New
RS Stock No. 198-4485
Mfr. Part No.METSECT5DE100
€90.49
Each
units
1000:5 - Tropicalise 129mm 135mm 85mm 1kA 5 A -25°C +50°C - - Surface Mount -
RS Stock No. 173-0161
Mfr. Part No.AP-2500
€3.621
Each (In a Box of 250)
units
- - - - - - 15A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
New
RS Stock No. 198-4467
Mfr. Part No.METSECT5DA080
€70.74
Each
units
800:5 - Tropicalise 94mm 90mm 87mm 800A 5 A -25°C +60°C - - Surface Mount -
RS Stock No. 871-1613
Mfr. Part No.B82801B0205A100
BrandEPCOS
€1.40
Each (In a Bag of 3)
units
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS Stock No. 175-6132
Mfr. Part No.4NC5113-2CB21
BrandSiemens
€54.13
Each
units
60:5 - Window 65.6mm 60mm 75.3mm 60A 5 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
New
RS Stock No. 198-4504
Mfr. Part No.METSECT5MC050
€66.05
Each
units
500:5 32mm Tropicalise 95mm 70mm 65mm 500A 5 A -25°C +60°C - - DIN rail -
RS Stock No. 123-9526
Mfr. Part No.4NC5325-2CE20
BrandSiemens
€81.60
Each
units
400:5 36mm Window - - - 400A 5 A -10°C 55°C 82.5 x 80 x 98 mm Measuring Devices Panel Mount 4NC
RS Stock No. 181-0081
Mfr. Part No.MR-4
BrandKEMET
€23.67
Each
units
- - - - - - - - - - - - - -
RS Stock No. 175-6163
Mfr. Part No.4NC5223-0DE21
BrandSiemens
€64.31
Each
units
250:1 - Window 67.6mm 60.6mm 78.4mm 250A 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. 181-0085
Mfr. Part No.MR/C-01
BrandKEMET
€6.79
Each
units
- - - - - - - - - - - - - -
RS Stock No. 881-7966
Mfr. Part No.CTPROXT300SELV
BrandABB
€27.58
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS Stock No. 775-4928
Mfr. Part No.AX-1000
€2.41
Each
units
- - - - - - 10A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS Stock No. 181-2771
Mfr. Part No.ND5015/035/61
BrandDold
€184.23
Each
units
- - - 67mm 88mm 46mm 3A - -40°C +60°C 88 x 46 x 67 mm - DIN Rail RN 5883
RS Stock No. 175-6192
Mfr. Part No.4NC5330-2CE21
BrandSiemens
€67.98
Each
units
750:5 - Window 84.1mm 82.5mm 98mm 750A 5 A -30°C +55°C 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6215
Mfr. Part No.4NC5438-2DL21
BrandSiemens
€133.37
Each
units
2000:5 - Window 84.1mm 112mm 127.5mm 2kA 5 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
New
RS Stock No. 198-4484
Mfr. Part No.METSECT5DD150
€97.23
Each
units
1500:5 - Tropicalise 116mm 96mm 78.4mm 1.5kA 5 A -25°C +50°C - - Surface Mount -
RS Stock No. 175-6156
Mfr. Part No.4NC5125-2FE21
BrandSiemens
€64.18
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. 775-4909
Mfr. Part No.AZ-0500
€3.71
Each
units
- - - - - - 25A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS Stock No. 2508933598
Mfr. Part No.37023
BrandSimpson
€62.14
Each
units
- - - - - - - - - - - - - -
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