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. 775-4915
Mfr. Part No.AX-0500
MYR20.53
Each
units
5:1 - - - - 5A - - -40°C - +120°C - 12.7 x 17 x 9.53 mm -
RS Stock No. 914-5290
Mfr. Part No.CTSCMWH30/0.333V
BrandHOBUT
MYR116.56
Each
units
30:1 10mm Split Core - - 30A 333 mV - -15°C - +50°C - 28.7 x 26.4 x 41.7 mm Multi Function Meter
RS Stock No. 123-6730
Mfr. Part No.XS01-225221S 000000
MYR209.44
Each
units
150:5 33 x 23mm Clip Fit - - - - - - - - - 93 x 40 x 106 mm -
RS Stock No. 291-1233
Mfr. Part No.01.000158.222
BrandABB
MYR420.63
Each
units
- 26mm - - - - - 82mm -10°C 80mm +60°C 38mm - -
RS Stock No. 533-0637
Mfr. Part No.CTSCM40-100/5
BrandHOBUT
MYR200.05
Each
units
100:5 - Clip Fit - - - - 104.5mm -30°C 116mm +80°C 35.5mm - -
RS Stock No. 782-6809
Mfr. Part No.8-1611461-1
MYR121.54
Each
units
- - - - - - - - - - - - 6.67 x 5.54 x 6.65 mm -
RS Stock No. 169-7652
Mfr. Part No.CSLA1CF
BrandHoneywell
MYR117.559
Each (In a Box of 50)
units
100:1 10.9mm - Open Loop 8 → 16 V dc 100A - 35.6mm -25°C 34.3mm +85°C 10.4mm - -
RS Stock No. 173-0070
Mfr. Part No.AX-0500
MYR13.066
Each (In a Box of 250)
units
5:1 - - - - 5A - - -40°C - +120°C - 12.7 x 17 x 9.53 mm -
RS Stock No. 650-560
Mfr. Part No.CSLA1CF
BrandHoneywell
MYR150.14
Each
units
- 10.9mm - Open Loop 8 → 16 V dc - - - - - - - - -
RS Stock No. 886-2124
Mfr. Part No.XM02-185071S000000
MYR65.15
Each
units
100:5 21mm Base Mounted - - - - - - - - - 45 x 40 x 65 mm -
RS Stock No. 499-5356
Mfr. Part No.LTSR 6-NP
BrandLEM
MYR82.64
Each
units
19.2:1 3.2mm - Closed Loop 5 V 19.2A - 24mm -40°C 22.2mm +85°C 10mm - -
RS Stock No. 173-0049
Mfr. Part No.AC-1030
MYR20.198
Each (In a Box of 120)
units
30:1 - - - - 30A - - -40°C - +120°C - 30.2 x 14.3 x 30.2 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. 477-4711
Mfr. Part No.CSNS300M
BrandHoneywell
MYR500.92
Each
units
600:1 26mm - Closed Loop 15 V 600A 150 mA 61.2mm -40°C 67.5mm +85°C 19mm - -
RS Stock No. 751-1617
Mfr. Part No.93482 P1
MYR108.03
Each
units
100:1 - - - - 100A - - -20°C - +70°C - 70 (Dia.) x 36 mm -
RS Stock No. 123-6728
Mfr. Part No.XN45-345051S000000
MYR165.02
Each
units
630:5 31mm Base Mounted - - 630A 5 A - - - - - 141 x 38 x 102.5 mm MCCB
RS Stock No. 666-8172
Mfr. Part No.CAS 6-NP
BrandLEM
MYR64.67
Each
units
6:1 - - Closed Loop 5.25 V 6A - 16.5mm -40°C 21.91mm +85°C 13.4mm - -
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. 446-0614
Mfr. Part No.DK 100 B420
BrandLEM
MYR2,508.68
Each
units
100:1 21.7mm - Open Loop 20 → 50 V dc 100A 4 → 20 mA 68.6mm -20°C 89.7mm +50°C 30.2mm - -
RS Stock No. 331-468
Mfr. Part No.CT132M120/5-2.5/1
BrandHOBUT
MYR77.98
Each
units
120:5 21mm DIN Rail Mounted - - 120A 5 A 65mm -30°C 45mm +85°C 30mm - -