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. 175-6132
Mfr. Part No.4NC5113-2CB21
BrandSiemens
MYR407.31
Each
units
60:5 - Window - - 60A 5 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. 175-6123
Mfr. Part No.3UL2303-1A
BrandSiemens
MYR918.32
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. 257-824
Mfr. Part No.CT173M300/5-2.5/1-002
BrandHOBUT
MYR88.51
Each
units
300:5 40mm Base Mounted - - 300A 5 A 95mm -30°C 70mm +85°C 55mm - -
RS Stock No. 392-8311
Mfr. Part No.ASK 412.4 100/5 A
MYR168.73
Each
units
100:5 30.5mm Base Mounted - - - - 88.5mm -5°C 70mm +40°C 58mm - -
RS Stock No. 175-6126
Mfr. Part No.3UL2306-1A
BrandSiemens
MYR2,210.22
Each
units
40:1 - Toroidal Ring - - 40A 500 A 64mm -25°C 201mm +60°C 207.5mm 201 x 207.5 x 64 mm Fault Current Monitoring
RS Stock No. 198-778
Mfr. Part No.AT 20 B420L
BrandLEM
MYR374.63
Each
units
20:1 16mm - - 20 → 30 V dc 20A 4 → 20 mA 67mm -20°C 44.5mm +60°C 36.5mm - -
RS Stock No. 833-2752
Mfr. Part No.DM2T0200
BrandLovato
MYR108.98
Each
units
200:5 23mm Base Mounted - - - - 65.5mm -25°C 52mm +50°C 46.5mm - -
RS Stock No. 881-7954
Mfr. Part No.CTPROXT200SELV
BrandABB
MYR157.09
Each
units
- 18mm - - - - - - -5°C - +50°C - 45 x 96 x 69 mm -
RS Stock No. 136-2046
Mfr. Part No.TLV493DA1B6HTSA2
BrandInfineon
MYR4.683
Each (In a Pack of 10)
units
3.7 mA - - - 2.8 → 3.5 V 3.7mA - 2.9mm -40°C 1.6mm +125°C 1mm - -
New
RS Stock No. 217-6203
Mfr. Part No.TDAA2
BrandIME
MYR1,619.56
Each
units
1/700 110mm - - 720 V 700A 1 A 400mm - 400mm - - - -
RS Stock No. 173-0201
BrandRS PRO
MYR16.606
Each (In a Box of 114)
units
1000:1 14.6mm - - - 200A - - -55°C - +130°C - 38.1 x 15.9 x 38.1 mm -
RS Stock No. 124-3903
BrandRS PRO
MYR27.20
Each
units
1000:1 5mm - - - 120A - - -40°C - +85°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 175-6168
Mfr. Part No.4NC5224-2CE21
BrandSiemens
MYR400.25
Each
units
300:5 - Window - - 300A 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. 170-9250
Mfr. Part No.54050C
MYR5.345
Each (On a Reel of 450)
units
15:1 - - - - 15A - - -40°C - +125°C - 10.8 x 9 x 8.2 mm -
RS Stock No. 833-2762
Mfr. Part No.DM3T0600
BrandLovato
MYR213.41
Each
units
600:5 30mm Base Mounted - - - - 81.5mm -25°C 71mm +50°C 62.5mm - -
RS Stock No. 136-6362
Mfr. Part No.XM07-275081S000000
MYR61.17
Each
units
250:5 26mm - - - 250A 5 A 70mm - 50mm - 44.5mm 50 x 44.5 x 70 mm -
New
RS Stock No. 217-6182
Mfr. Part No.TA32750C300
BrandIME
MYR90.62
Each
units
300/5 27 mm, 32.5 x 10.5 mm - - - 300A 5 A 32.5mm - 27mm - - - -
RS Stock No. 138-3473
Mfr. Part No.HO 120-NP-0100
BrandLEM
MYR57.05
Each
units
300:1 1.75mm - Open Loop 4.5 → 5.5 V 300A 19 → 25 mA 27.43mm -40°C 41.56mm +105°C 20.13mm - -
RS Stock No. 106-8534
Mfr. Part No.56050C
MYR6.92
Each (In a Tube of 25)
units
10:1 - - - - 10A - - -40°C - +85°C - 16.79 x 8.89 x 20.19 mm -
New
RS Stock No. 215-4118
Mfr. Part No.KM20-CTF-50A
BrandOmron
MYR136.25
Each
units
Every Day:8 - Straight Through - - 50A - 96 - 48 - - - -