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. 331-474
Mfr. Part No.CT132M50/5-1/1
BrandHOBUT
MYR77.05
Each
units
50:5 21mm DIN Rail Mounted - - 50A 5 A 65mm -30°C 45mm +85°C 30mm - -
RS Stock No. 302-6077
Mfr. Part No.2814359
MYR1,304.78
Each
units
5:1 - - - - 5A 0 → 20 mA 99mm -25°C 22.5mm +60°C 114.5mm - -
RS Stock No. 751-1633
Mfr. Part No.93489 P1
MYR105.41
Each
units
600:1 - - - - 600A - - -20°C - +70°C - 80 (Dia.) x 20 mm -
RS Stock No. 451-1396
Mfr. Part No.LF 1005S
BrandLEM
MYR1,095.26
Each
units
1500:1 40.5mm - Closed Loop 15 → 24 V 1500A 200 mArms 95mm -40°C 110mm +85°C 34.3mm - -
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. 751-1642
Mfr. Part No.93490 P1
MYR126.73
Each
units
800:1 - - - - 800A - - -20°C - +70°C - 102 (Dia.) x 20 mm -
RS Stock No. 820-0435
Mfr. Part No.2904922
MYR1,408.99
Each
units
4000:1 8.3mm - - 24 V dc 4000A 0 → 1 A 70.4mm -30°C 22.5mm +80°C 85mm - -
RS Stock No. 477-4749
Mfr. Part No.CSNS300F
BrandHoneywell
MYR607.83
Each
units
600:1 26mm - Closed Loop 15 V 600A 150 mA 61.2mm -40°C 67.5mm +85°C 17.9mm - -
RS Stock No. 533-0643
Mfr. Part No.CTSCM40-200/5
BrandHOBUT
MYR262.47
Each
units
200:5 - Clip Fit - - - - 104.5mm -30°C 116mm +80°C 35.5mm - -
RS Stock No. 206-2432
Mfr. Part No.HAL 400-S
BrandLEM
MYR379.56
Each
units
1000:1 20 x 15mm - Open Loop 15 V 1000A - 41mm -25°C 41.27mm +85°C 31.3mm - -
RS Stock No. 173-0060
Mfr. Part No.AC-1200
MYR44.404
Each (In a Box of 27)
units
200:1 - - - - 200A - - -40°C - +120°C - 55.6 x 20.6 x 55.6 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. 177-5952
Mfr. Part No.CSLA1CD
BrandHoneywell
MYR96.299
Each (In a Tray of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 451-1324
Mfr. Part No.LA 100P/SP13
BrandLEM
MYR125.04
Each
units
160:1 12.7 x 7mm - Closed Loop 12 → 15 V 160A 100 mArms 27.6mm -25°C 36.5mm +70°C 14.45mm - -
RS Stock No. 436-2330
Mfr. Part No.LTS 6NP
BrandLEM
MYR71.58
Each
units
19.2:1 3.2mm - Closed Loop 5 V 19.2A - 24mm -40°C 22.2mm +85°C 10mm - -
RS Stock No. 123-6724
Mfr. Part No.XN45-285051S000000
MYR165.02
Each
units
300:5 31mm Base Mounted - - 300A 5 A - - - - - 141 x 38 x 102.5 mm MCCB
RS Stock No. 650-554
Mfr. Part No.CSLA1CD
BrandHoneywell
MYR117.03
Each
units
- 10.9mm - Open Loop 8 → 16 V dc - - - - - - - - -
RS Stock No. 729-5520
Mfr. Part No.AC-1200
MYR49.30
Each
units
200:1 - - - - 200A - - -40°C - +120°C - 55.6 x 20.6 x 55.6 mm -
RS Stock No. 286-311
Mfr. Part No.LA 25-NP
BrandLEM
MYR123.73
Each
units
36:1 - - Closed Loop 15 V 36A 25 mArms 16.45mm -40°C 26mm +85°C 29.2mm - -
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 - -