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. 207-2990
Mfr. Part No.LA 305S
BrandLEM
TWD2,999.00
Each
units
500:1 25.5mm - Closed Loop 12 → 15 V 500A 120 mArms 73.4mm -10°C 86mm +85°C 46.4mm - -
RS Stock No. 715-7024
Mfr. Part No.53030C
TWD62.00
Each
units
10:1 - - - - 10A - - -40°C - +125°C - 8.3 x 7.2 x 5.4 mm -
RS Stock No. 715-7043
Mfr. Part No.53200C
TWD60.00
Each
units
10:1 - - - - 10A - - -40°C - +125°C - 8.3 x 7.2 x 5.4 mm -
RS Stock No. 537-4508
Mfr. Part No.AC-1015
TWD201.60
Each (In a Pack of 5)
units
15:1 - - - - 15A - - -40°C - +120°C - 23.8 x 23.8 x 11.12 mm -
RS Stock No. 914-5301
Mfr. Part No.CTSCMWH500/0.333V
BrandHOBUT
TWD1,404.00
Each
units
- 35mm Split Core - - 500A 333 mV - -15°C - +50°C - 51.2 x 51.2 x 83.5 mm Multi Function Meter
RS Stock No. 351-106
Mfr. Part No.MI20
TWD3,699.00
Each
units
20:1 - - - - 20A - 45mm -20°C 52mm +60°C 16mm - -
RS Stock No. 173-0044
BrandRS PRO
TWD41.60
Each (In a Box of 351)
units
300:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 790-1216
Mfr. Part No.ACF-3000AK
BrandAmprobe
TWD10,617.00
Each
units
30:1 14.3mm - - 3 V 30A - - -20°C - +85°C - - -
RS Stock No. 497-110
Mfr. Part No.LA 200-P
BrandLEM
TWD1,722.00
Each
units
300:1 13 x 11mm - Closed Loop 12 → 15 V 300A 100 mArms 33.6mm -40°C 48.4mm +85°C 21.4mm - -
RS Stock No. 914-5294
Mfr. Part No.CTSCMWH60/0.333V
BrandHOBUT
TWD749.00
Each
units
- 10mm Split Core - - 60A 333 mV - -15°C - +50°C - 28.7 x 26.4 x 41.7 mm Multi Function Meter
RS Stock No. 751-1642
Mfr. Part No.93490 P1
TWD801.00
Each
units
800:1 - - - - 800A - - -20°C - +70°C - 102 (Dia.) x 20 mm -
RS Stock No. 775-4921
Mfr. Part No.AX-1500
TWD136.00
Each
units
15:1 - - - - 15A - - -40°C - +120°C - 12.7 x 17 x 9.53 mm -
RS Stock No. 173-0055
Mfr. Part No.AX-1500
TWD121.80
Each (In a Box of 250)
units
15:1 - - - - 15A - - -40°C - +120°C - 12.7 x 17 x 9.53 mm -
RS Stock No. 321-6309
Mfr. Part No.LAH 100-P
BrandLEM
TWD783.00
Each
units
100:1 - - Closed Loop 12 → 15 V 100A 50 mArms 21mm -25°C 33.3mm +85°C 14.93mm - -
RS Stock No. 650-560
Mfr. Part No.CSLA1CF
BrandHoneywell
TWD1,163.00
Each
units
- 10.9mm - Open Loop 8 → 16 V dc - - - - - - - - -
RS Stock No. 170-9247
Mfr. Part No.53030C
TWD29.20
Each (On a Reel of 1000)
units
10:1 - - - - 10A - - -40°C - +125°C - 8.3 x 7.2 x 5.4 mm -
RS Stock No. 897-6933
Mfr. Part No.4 121 58
BrandLegrand
TWD7,813.00
Each
units
400:5 - Base Mounted - - - - - -25°C - +50°C - 135 x 66.5 x 56 mm Ammeter, Electricity Meter, Measurement Control Unit
RS Stock No. 533-0637
Mfr. Part No.CTSCM40-100/5
BrandHOBUT
TWD1,459.00
Each
units
100:5 - Clip Fit - - - - 104.5mm -30°C 116mm +80°C 35.5mm - -
RS Stock No. 914-5304
Mfr. Part No.CTSCMWH120/0.333V
BrandHOBUT
TWD878.00
Each
units
- 16mm Split Core - - 120A 333 mV - -15°C - +50°C - 29.9 x 31 x 53 mm Multi Function Meter
RS Stock No. 198-829
Mfr. Part No.AT 20 B5
BrandLEM
TWD1,685.00
Each
units
20:1 16mm - - - 20A - 67mm -20°C 44.5mm +60°C 36.5mm - -