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. 751-1617
Mfr. Part No.93482 P1
MYR106.39
Each
units
100:1 - - - - 100A - - -20°C - +70°C - 70 (Dia.) x 36 mm -
RS Stock No. 886-2099
Mfr. Part No.XW01-045081S000000
MYR102.32
Each
units
5:5 - Base Mounted - - - - - - - - - 62 x 40 x 78 mm -
RS Stock No. 522-014
Mfr. Part No.HAT 200-S
BrandLEM
MYR311.04
Each
units
600:1 40.5 x 30.5mm - Open Loop 15 V 600A - 65mm -10°C 90mm +80°C 37mm - -
RS Stock No. 532-9227
Mfr. Part No.HTFS 400-P
BrandLEM
MYR87.11
Each
units
600:1 22mm - Open Loop 5 V 600A - 46mm -40°C 40mm +105°C 17mm - -
RS Stock No. 435-8684
Mfr. Part No.HX 03-P/SP2
BrandLEM
MYR60.53
Each
units
9:1 0.6mm - Open Loop 12 → 15 V 9A - 20.5mm -25°C 19mm +85°C 15.4mm - -
RS Stock No. 331-430
Mfr. Part No.CT132M150/5-2.5/1
BrandHOBUT
MYR86.35
Each
units
150:5 21mm DIN Rail Mounted - - 150A 5 A 65mm -30°C 45mm +85°C 30mm - -
RS Stock No. 914-5304
Mfr. Part No.CTSCMWH120/0.333V
BrandHOBUT
MYR136.62
Each
units
120:1 16mm Split Core - - 120A 333 mV - -15°C - +50°C - 29.9 x 31 x 53 mm Multi Function Meter
RS Stock No. 833-2888
Mfr. Part No.2CCA880117R0001
BrandABB
MYR616.60
Each
units
160:1 15mm - - 690 V ac, 1500 V dc 160A - 35.65mm -25°C 43mm +70°C 43mm - -
RS Stock No. 331-575
Mfr. Part No.CTSCM40500/5-5/1
BrandHOBUT
MYR271.96
Each
units
500:5 - Clip Fit - - 500A 5 A 116mm -30°C 104.5mm +80°C 35.5mm - -
RS Stock No. 198-807
Mfr. Part No.AT 10 B10
BrandLEM
MYR263.89
Each
units
10:1 16mm - - - 10A - 67mm -20°C 44.5mm +60°C 36.5mm - -
RS Stock No. 527-8523
Mfr. Part No.DHR 100 C10
BrandLEM
MYR853.20
Each
units
100:1 32mm - Open Loop 20 → 50 V dc 100A - 70mm -40°C 90mm +70°C 25mm - -
RS Stock No. 864-0889
Mfr. Part No.CTSR_1-P
BrandLEM
MYR149.13
Each
units
1.7:1 20.1mm - Closed Loop 7 V 1.7A - 44.6mm -40°C 41.35mm +105°C 17.9mm - -
RS Stock No. 793-4587
Mfr. Part No.HLSR 20-P
BrandLEM
MYR46.56
Each
units
50:1 - - Open Loop 4.5 → 5.5 V 50A 20 A 12mm -40°C 17.2mm +105°C 21mm - -
RS Stock No. 123-6732
Mfr. Part No.XS01-275071S 000000
MYR239.29
Each
units
250:5 - Base Mounted - - 250A 5 A - +20°C - +70°C - - -
RS Stock No. 667-3459
Mfr. Part No.CSNE151-104
BrandHoneywell
MYR62.24
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. 777-7170
Mfr. Part No.17H7NNJN3
BrandGIC
MYR432.15
Each
units
- 92mm Base Mounted, DIN Rail Mounted - - - - 132mm -15°C 20mm 60°C 155mm - -
RS Stock No. 207-2940
Mfr. Part No.HTA 1000-S
BrandLEM
MYR446.11
Each
units
1000:1 32mm - Open Loop 15 V 1000A - 70mm -25°C 90mm +85°C 27.5mm - -
RS Stock No. 106-8529
Mfr. Part No.54100C
MYR6.125
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. 497-209
Mfr. Part No.AT 50 B420L
BrandLEM
MYR493.41
Each
units
50:1 16mm - - 20 → 30 V dc 50A 4 → 20 mA 67mm -20°C 44.5mm +60°C 36.5mm - -
RS Stock No. 337-2724
Mfr. Part No.2814731
MYR1,902.56
Each
units
- - - - 20 → 30 V dc - - - - - - - - -