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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Omschrijving Prijs 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-stocknr. 331-345
FabrikantnummerCT132M80/5-1.5/1
FabrikantHOBUT
14,43 €
Each
Aantal stuks
80:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
RS-stocknr. 751-1614
Fabrikantnummer93481 P1
FabrikantNuvotem Talema
18,58 €
Each
Aantal stuks
- - - - - - 60A - -20°C +70°C 70 (Dia.) x 36 mm - Stand Alone -
RS-stocknr. 173-0057
FabrikantnummerAX-1000
FabrikantNuvotem Talema
2,636 €
Each (In a Box of 250)
Aantal stuks
- - - - - - 10A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS-stocknr. 715-7077
Fabrikantnummer56T100C
1,38 €
Each
Aantal stuks
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS-stocknr. 399-7317
FabrikantnummerAS-103
FabrikantNuvotem Talema
1,72 €
Each
Aantal stuks
- - - - - - 15A - -40°C +120°C 17.2 x 20.4 x 9.53 mm - PCB Mount -
RS-stocknr. 106-8537
Fabrikantnummer56T100C
1,352 €
Each (In a Tube of 25)
Aantal stuks
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS-stocknr. 533-0621
FabrikantnummerCTSCEN200<1000/5
FabrikantHOBUT
83,16 €
Each
Aantal stuks
200:5, 400:5, 600:5, 800:5, 1000:5 - Clip Fit 125mm 132mm 38mm - - -30°C +80°C - - - -
RS-stocknr. 173-0161
FabrikantnummerAP-2500
FabrikantNuvotem Talema
3,434 €
Each (In a Box of 250)
Aantal stuks
- - - - - - 15A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS-stocknr. 123-6732
FabrikantnummerXS01-275071S 000000
FabrikantSifam Tinsley
41,92 €
Each
Aantal stuks
250:5 - Base Mounted - - - 250A 5 A +20°C +70°C - - Plug In Omega
RS-stocknr. 832-9848
FabrikantnummerL01-8506
FabrikantAlttec
20,62 €
Each
Aantal stuks
100:5 28mm Clip Fit 78.5mm 61mm 40mm - - - +40°C 78.5 x 61 x 72 mm - - -
RS-stocknr. 871-1626
FabrikantnummerB82801B0803A020
FabrikantEPCOS
2,263 €
Each (In a Bag of 3)
Aantal stuks
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS-stocknr. 871-1648
FabrikantnummerB82801C2245A200
FabrikantEPCOS
3,667 €
Each (In a Bag of 3)
Aantal stuks
- - - - - - 40A - -40°C +125°C 14.22 x 13.46 x 10 mm - Surface Mount -
RS-stocknr. 775-2701
FabrikantnummerCTSCMICRO19-100/5-T-S
FabrikantHOBUT
50,06 €
Each
Aantal stuks
- - - 78mm 58mm 49mm - - -30°C 55°C - - - -
RS-stocknr. 331-575
FabrikantnummerCTSCM40500/5-5/1
FabrikantHOBUT
49,22 €
Each
Aantal stuks
500:5 - Clip Fit 116mm 104.5mm 35.5mm - - -30°C +80°C - - - -
RS-stocknr. 611-8602
FabrikantnummerK8ACCT200L
FabrikantOmron
68,30 €
1 Box of 1
Box(es)
- 30mm Toroidal Ring 81.5mm 76mm 20mm - - - - - - - -
RS-stocknr. 715-7071
Fabrikantnummer56T200C
1,38 €
Each
Aantal stuks
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS-stocknr. 162-0292
FabrikantnummerB82801B0803A020
FabrikantEPCOS
1,10 €
Each (On a Reel of 900)
Aantal stuks
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS-stocknr. 914-5294
FabrikantnummerCTSCMWH60/0.333V
FabrikantHOBUT
21,71 €
Each
Aantal stuks
- 10mm Split Core - - - 60A 333 mV -15°C +50°C 28.7 x 26.4 x 41.7 mm Multi Function Meter Cable -
RS-stocknr. 881-7935
FabrikantnummerCTPROXT300
FabrikantABB
31,95 €
Each
Aantal stuks
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
RS-stocknr. 167-0564
FabrikantnummerB82801C2245A200
FabrikantEPCOS
1,994 €
Each (On a Reel of 200)
Aantal stuks
- - - - - - 40A - -40°C +125°C 14.22 x 13.46 x 10 mm - Surface Mount -