Current Transformers

Current transformers (CT) are devices that are used to transform the current from a high current into a lower current so that the power can then be measured and controlled. The transformers consist of a core, a primary and a secondary winding. 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.


Current transformers can perform circuit control and perform roles for safety protection and current limiting.


Current transformers are found in:


  • Generating stations,

  • Electrical substations

  • Commercial electric power distribution.

Types of Current Transformers


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.


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Description Price Current Ratio Inner Diameter Transformer Type Overall Height Overall Width Overall Depth Input Current Output Current Minimum Temperature Maximum Temperature Dimensions For Use With Mounting Type Series
RS Stock No. 914-5301
Mfr. Part No.CTSCMWH500/0.333V
BrandHOBUT
$67.75
Each
units
- 35mm Split Core - - - 500A 333 mV -15°C +50°C 51.2 x 51.2 x 83.5 mm Multi Function Meter Cable -
RS Stock No. 914-5294
Mfr. Part No.CTSCMWH60/0.333V
BrandHOBUT
$36.12
Each
units
- 10mm Split Core - - - 60A 333 mV -15°C +50°C 28.7 x 26.4 x 41.7 mm Multi Function Meter Cable -
RS Stock No. 441-4920
Mfr. Part No.BZCT120
$213.61
Each
units
- 120mm - 170mm 155mm 40mm - - -20°C +60°C - Broyce Type A Earth Leakage Relays Surface Mount BZCT
RS Stock No. 397-9117
Mfr. Part No.BZCT035
$85.78
Each
units
- 35mm - 74mm 64mm 40mm - - -20°C +60°C - Broyce Type A Earth Leakage Relays Surface Mount BZCT
RS Stock No. 751-1617
Mfr. Part No.93482 P1
$55.80
Each
units
- - - - - - 100A - -20°C +70°C 70 (Dia.) x 36 mm - Stand Alone -
RS Stock No. 331-452
Mfr. Part No.CT132M200/5-2.5/0.5
BrandHOBUT
$34.61
Each
units
200:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
RS Stock No. 331-424
Mfr. Part No.CT132M250/5-2.5/0.5
BrandHOBUT
$28.24
Each
units
250:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
RS Stock No. 729-5517
Mfr. Part No.AC-1100
$10.50
Each
units
- - - - - - 100A - -40°C +120°C 44.5 x 14.3 x 44.5 mm - Through Hole -
RS Stock No. 668-4055
Mfr. Part No.CT105F150/5-2.5/1
BrandHOBUT
$67.75
Each
units
150:5 21mm Base Mounted 79mm 105mm 53mm - - -30°C +80°C - - - -
RS Stock No. 775-2714
Mfr. Part No.CTSCMICRO19-200/5-T-S
BrandHOBUT
$91.27
Each
units
200:5 - Split Core 78mm 58mm 49mm - - -30°C +55°C - - - -
RS Stock No. 250-0136
Mfr. Part No.TRA12UN111
BrandCarel
$18.52
Each
units
- - - 47mm 58mm 33mm - - - - - 12/24Vac controllers Surface Mount -
RS Stock No. 173-0061
Mfr. Part No.AC-1100
$9.462
Each (In a Box of 27)
units
- - - - - - 100A - -40°C +120°C 44.5 x 14.3 x 44.5 mm - Through Hole -
RS Stock No. 668-4064
Mfr. Part No.CT105F200/5-2.5/1
BrandHOBUT
$70.57
Each
units
200:5 21mm Base Mounted 79mm 105mm 53mm - - -30°C +80°C - - - -
RS Stock No. 886-2124
Mfr. Part No.XM02-185071S000000
$20.58
Each
units
100:5 21mm Base Mounted - - - - - - - 45 x 40 x 65 mm - Surface Mount Omega XMER
RS Stock No. 173-0218
BrandRS PRO
$32.431
Each (In a Box of 25)
units
- - - - - - 100 → 250A - -55°C +130°C 44.5 x 14.3 x 44.5 mm - PCB Mount -
RS Stock No. 173-0161
Mfr. Part No.AP-2500
$6.686
Each (In a Box of 250)
units
- - - - - - 15A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS Stock No. 913-9731
Mfr. Part No.METSECT5CC005
$80.95
Each
units
50:5 21mm Toroidal Ring - - - - - -25°C +60°C 65 x 44 x 30 mm - DIN Rail -
RS Stock No. 775-4959
Mfr. Part No.AP-2500
$7.50
Each
units
- - - - - - 15A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS Stock No. 331-480
Mfr. Part No.CTSCM40600/5-5/1
BrandHOBUT
$72.59
Each
units
600:5 - Clip Fit 104.5mm 116mm 35.5mm - - -30°C +80°C - - - -
RS Stock No. 418-3604
Mfr. Part No.CTSCEN100<400/5
BrandHOBUT
$134.09
Each
units
100:5, 200:5, 300:5, 400:5 - Clip Fit 113mm 127mm 40mm - - -30°C +80°C - - - -
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