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. 913-9731
Mfr. Part No.METSECT5CC005
MYR273.51
Each
units
50:5 21mm Toroidal Ring - - - - - -25°C - +60°C - 65 x 44 x 30 mm -
RS Stock No. 913-9738
Mfr. Part No.METSECT5CC020
MYR294.55
Each
units
200:5 21mm Toroidal Ring - - - - - -25°C - +60°C - 65 x 44 x 30 mm -
RS Stock No. 913-9734
Mfr. Part No.METSECT5CC013
MYR277.15
Each
units
125:5 21mm Toroidal Ring - - - - - -25°C - +60°C - 65 x 44 x 30 mm -
RS Stock No. 198-4499
Mfr. Part No.METSECT5MB030
MYR384.55
Each
units
300:5 26mm Tropicalise - - 300A 5 A 85mm -25°C 60mm +60°C 63mm - -
RS Stock No. 198-4469
Mfr. Part No.METSECT5DA125
MYR535.59
Each
units
1250:5 - Tropicalise - - 1250A 5 A 94mm -25°C 90mm +60°C 87mm - -
New
RS Stock No. 211-1871
Mfr. Part No.LUTC4001
MYR466.52
Each
units
400A - Base Mounted - - 400A 1 A 170mm - 38mm - - - -
RS Stock No. 198-4497
Mfr. Part No.METSECT5MB025
MYR363.93
Each
units
250:5 26mm Tropicalise - - 250A 5 A 85mm -25°C 60mm +60°C 63mm - -
New
RS Stock No. 211-1869
Mfr. Part No.LUTC2001
MYR331.20
Each
units
200A - Base Mounted - - 200A 1 A 99mm - 32mm - - - -
RS Stock No. 198-4503
Mfr. Part No.METSECT5MC040
MYR453.20
Each
units
400:5 32mm Tropicalise - - 400A 5 A 95mm -25°C 70mm +60°C 65mm - -
RS Stock No. 198-4496
Mfr. Part No.METSECT5MA040
MYR370.31
Each
units
400:5 27mm Tropicalise - - 400A 5 A 80mm -25°C 56mm +60°C 63mm - -
RS Stock No. 198-4507
Mfr. Part No.METSECT5MD050
MYR470.00
Each
units
500:5 40mm Tropicalise - - 500A 5 A 95mm -25°C 70mm +60°C 65mm - -
RS Stock No. 198-4509
Mfr. Part No.METSECT5MD080
MYR487.53
Each
units
800:5 40mm Tropicalise - - 800A 5 A 95mm -25°C 70mm +60°C 65mm - -
RS Stock No. 198-4471
Mfr. Part No.METSECT5DB100
MYR733.49
Each
units
1000:5 - Tropicalise - - 1000A 5 A 160mm -25°C 99mm +60°C 78.4mm - -
RS Stock No. 198-4508
Mfr. Part No.METSECT5MD060
MYR477.13
Each
units
600:5 40mm Tropicalise - - 600A 5 A 95mm -25°C 70mm +60°C 65mm - -
RS Stock No. 198-4464
Mfr. Part No.METSECT5CC015
MYR291.97
Each
units
150:5 21mm Tropicalise - - 150A 5 A 65mm -25°C 44mm +60°C 37mm - -
RS Stock No. 198-4484
Mfr. Part No.METSECT5DD150
MYR697.89
Each
units
1500:5 - Tropicalise - - 1500A 5 A 116mm -25°C 96mm +50°C 78.4mm - -
RS Stock No. 198-4480
Mfr. Part No.METSECT5DC300
MYR1,046.83
Each
units
3000:5 - Tropicalise - - 3000A 5 A 160mm -25°C 125mm +50°C 87mm - -
RS Stock No. 198-4492
Mfr. Part No.METSECT5MA015
MYR329.60
Each
units
150:5 27mm Tropicalise - - 150A 5 A 80mm -25°C 56mm +60°C 63mm - -
RS Stock No. 198-4485
Mfr. Part No.METSECT5DE100
MYR655.16
Each
units
1000:5 - Tropicalise - - 1000A 5 A 129mm -25°C 135mm +50°C 85mm - -
RS Stock No. 198-4474
Mfr. Part No.METSECT5DB200
MYR823.99
Each
units
2000:5 - Tropicalise - - 2000A 5 A 160mm -25°C 99mm +60°C 78.4mm - -