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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รายละเอียดสินค้า / Description ราคา / 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. 173-0181
Brand :RS PRO
THB139.677
Each (In a Box of 351)
Units
10:1 5mm - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3882
Brand :RS PRO
THB170.37
Each
Units
10:1 5mm - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3897
Brand :RS PRO
THB181.95
Each
Units
1000:1 7mm - - - 50A - - -40°C - +85°C - 19 x 11.5 x 21.5 mm -
RS Stock No. 173-0217
Brand :RS PRO
THB211.216
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. 173-0201
Brand :RS PRO
THB124.898
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. 124-3879
Brand :RS PRO
THB57.89
Each
Units
50:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3893
Brand :RS PRO
THB232.35
Each
Units
1000:1 14.6mm - - - 200A - - -55°C - +130°C - 38.1 x 15.9 x 38.1 mm -
RS Stock No. 173-0041
Brand :RS PRO
THB47.471
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. 124-3896
Brand :RS PRO
THB162.10
Each
Units
500:1 7mm - - - 25A - - -40°C - +85°C - 19 x 11.5 x 21.5 mm -
RS Stock No. 124-3892
Brand :RS PRO
THB230.31
Each
Units
1000:1 14.6mm - - - 200A - - -55°C - +130°C - 38.1 x 15.9 x 38.1 mm -
RS Stock No. 124-3900
Brand :RS PRO
THB182.50
Each
Units
1000:1 5mm - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0220
Brand :RS PRO
THB145.888
Each (In a Box of 140)
Units
500:1 7mm - - - 25A - - -40°C - +85°C - 19 x 11.5 x 21.5 mm -
RS Stock No. 173-0235
Brand :RS PRO
THB165.102
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. 171-8789
Brand :RS PRO
THB554.50
Each
Units
300:5 40 x 11mm Clip Fit - - 300A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS Stock No. 171-8790
Brand :RS PRO
THB825.98
Each
Units
400:1 40 x 11mm - - - - - 78mm - 62mm - 40mm 62 x 40 x 78 mm -
RS Stock No. 171-8858
Brand :RS PRO
THB724.60
Each
Units
20:5 62 x 40mm Clip Fit - - 20A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS Stock No. 171-8783
Brand :RS PRO
THB737.24
Each
Units
150:5 30 x 11mm Clip Fit - - 150A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS Stock No. 124-3891
Brand :RS PRO
THB117.62
Each
Units
1000:1 14.6mm - - - 125A - - -55°C - +130°C - 34.9 x 14.3 x 34.9 mm -
RS Stock No. 171-8809
Brand :RS PRO
THB1,085.38
Each
Units
1500:5 61 x 51mm Clip Fit - - 1500A 5 A 110mm -5°C 86mm +55°C 45mm 86 x 45 x 110 mm -
RS Stock No. 171-8846
Brand :RS PRO
THB1,475.00
Each
Units
100:5 33 x 23mm Base Mounted - - 100A 5 A 106mm +20°C 93mm +70°C 40mm 93 x 40 x 106 mm -