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. 124-3879
BrandRS PRO
PHP89.34
Each
units
50:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0041
BrandRS PRO
PHP73.255
Each (In a Box of 351)
units
50:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0184
BrandRS PRO
PHP359.96
Each (In a Box of 98)
units
50:1 8mm - - - 50A - - -40°C - +120°C - 32 x 20.5 x 35 mm -
RS Stock No. 124-3883
BrandRS PRO
PHP397.55
Each
units
50:1 8mm - - - 50A - - -40°C - +120°C - 32 x 20.5 x 35 mm -
RS Stock No. 173-0045
BrandRS PRO
PHP143.821
Each (In a Box of 351)
units
500:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3898
BrandRS PRO
PHP145.49
Each
units
500:1 5mm - - - 5A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0215
BrandRS PRO
PHP131.057
Each (In a Box of 351)
units
500:1 5mm - - - 5A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3895
BrandRS PRO
PHP679.53
Each
units
1000:1 23.8mm - - - 200A - - -55°C - +130°C - 55.6 x 20.6 x 55.6 mm -
RS Stock No. 124-3881
BrandRS PRO
PHP171.86
Each
units
500:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0219
BrandRS PRO
PHP617.106
Each (In a Box of 18)
units
1000:1 23.8mm - - - 500A - - -55°C - +130°C - 55.6 x 20.6 x 55.6 mm -
RS Stock No. 124-3900
BrandRS PRO
PHP281.62
Each
units
1000:1 5mm - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3901
BrandRS PRO
PHP147.14
Each
units
1500:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0236
BrandRS PRO
PHP119.541
Each (In a Box of 351)
units
1500:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0235
BrandRS PRO
PHP254.776
Each (In a Box of 351)
units
1000:1 5mm - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0201
BrandRS PRO
PHP192.735
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. 124-3892
BrandRS PRO
PHP355.40
Each
units
1000:1 14.6mm - - - 200A - - -55°C - +130°C - 38.1 x 15.9 x 38.1 mm -
RS Stock No. 171-8801
BrandRS PRO
PHP1,726.11
Each
units
600:5 41 x 41mm Clip Fit - - 600A 5 A 98mm -5°C 74mm +55°C 45mm 74 x 45 x 98 mm -
RS Stock No. 171-8767
BrandRS PRO
PHP979.89
Each
units
- - - - - - - - - - - - - -
RS Stock No. 171-8827
BrandRS PRO
PHP1,586.32
Each
units
160:5 35mm Base Mounted - - 160A 5 A 87.5mm - 105mm - 38mm 105 x 38 x 87.5 mm MCCB
RS Stock No. 173-0238
BrandRS PRO
PHP224.062
Each (In a Box of 220)
units
2500:1 9.5mm - - - 50A - - -40°C - +85°C - 23.8 x 11.12 x 23.8 mm -