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 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. 532-9160
Mfr. Part No.HAIS 200-P
BrandLEM
HK$218.07
Each
units
600:1 15 x 8mm - Open Loop 5 V 600A - 29.5mm -40°C 33mm +85°C 14mm - -
RS Stock No. 729-5517
Mfr. Part No.AC-1100
HK$55.26
Each
units
100:1 - - - - 100A - - -40°C - +120°C - 44.5 x 14.3 x 44.5 mm -
RS Stock No. 897-6924
Mfr. Part No.4 121 57
BrandLegrand
HK$1,781.33
Each
units
250:5 - Base Mounted - - - - - -25°C - +50°C - 107 x 58.5 x 56 mm Ammeter, Electricity Meter, Measurement Control Unit
RS Stock No. 106-8529
Mfr. Part No.54100C
HK$12.69
Each (On a Reel of 450)
units
15:1 - - - - 15A - - -40°C - +125°C - 10.8 x 9 x 8.2 mm -
RS Stock No. 897-6857
Mfr. Part No.4 121 54
BrandLegrand
HK$2,203.76
Each
units
4000:5 - Base Mounted - - - - - -25°C - +50°C - 160 x 125 x 40 mm Ammeter, Electricity Meter, Measurement Control Unit
RS Stock No. 106-8532
Mfr. Part No.56100C
HK$13.926
Each (In a Tube of 25)
units
10:1 - - - - 10A - - -40°C - +85°C - 16.79 x 8.89 x 20.19 mm -
RS Stock No. 775-2701
Mfr. Part No.CTSCMICRO19-100/5-T-S
BrandHOBUT
HK$440.35
Each
units
- - - - - - - 78mm -30°C 58mm 55°C 49mm - -
RS Stock No. 886-2162
Mfr. Part No.XM19-285111S000000
HK$217.82
Each
units
300:5 50mm Base Mounted - - - - - - - - - 86 x 45 x 110 mm -
RS Stock No. 650-554
Mfr. Part No.CSLA1CD
BrandHoneywell
HK$235.59
Each
units
- 10.9mm - Open Loop 8 → 16 V dc - - - - - - - - -
RS Stock No. 313-801
Mfr. Part No.CT174M500/5-2.5/1-001
BrandHOBUT
HK$153.84
Each
units
500:5 40mm Base Mounted - - 500A 5 A 95mm -30°C 70mm +85°C 55mm - -
RS Stock No. 611-8602
Mfr. Part No.K8ACCT200L
BrandOmron
HK$621.76
1 Box of 1
Box(es)
- 30mm Toroidal Ring - - - - 81.5mm - 76mm - 20mm - -
RS Stock No. 919-4707
Mfr. Part No.LF 2010-S
BrandLEM
HK$2,157.84
Each
units
3000:1 - - Closed Loop ±14.25 → ±25.2 V 3000A ±0.6 A 135mm -40°C 170mm +85°C 52mm - -
RS Stock No. 828-5209
Mfr. Part No.BZCT050
HK$409.15
Each
units
- 50mm - - - - - - -20°C - +60°C - - Broyce Type A Earth Leakage Relays
RS Stock No. 106-8534
Mfr. Part No.56050C
HK$13.926
Each (In a Tube of 25)
units
10:1 - - - - 10A - - -40°C - +85°C - 16.79 x 8.89 x 20.19 mm -
RS Stock No. 167-0135
Mfr. Part No.B82801B0205A100
BrandEPCOS
HK$11.40
Each (On a Reel of 900)
units
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -
RS Stock No. 886-2130
Mfr. Part No.XM02-245081S000000
HK$110.86
Each
units
200:5 21mm Base Mounted - - - - - - - - - 45 x 40 x 65 mm -
RS Stock No. 207-2984
Mfr. Part No.LA 205-S
BrandLEM
HK$670.82
Each
units
300:1 22.7 x 17.4mm - Closed Loop 12 → 15 V 300A 100 mArms 56.3mm -10°C 66mm +85°C 56.5mm - -
RS Stock No. 715-7024
Mfr. Part No.53030C
HK$15.51
Each
units
10:1 - - - - 10A - - -40°C - +125°C - 8.3 x 7.2 x 5.4 mm -
RS Stock No. 301-9473
Mfr. Part No.LTS 25NP
BrandLEM
HK$166.09
Each
units
80:1 3.2mm - Closed Loop 5 V 80A - 24mm -40°C 22.2mm +85°C 10mm - -
RS Stock No. 477-4711
Mfr. Part No.CSNS300M
BrandHoneywell
HK$870.63
Each
units
600:1 26mm - Closed Loop 15 V 600A 150 mA 61.2mm -40°C 67.5mm +85°C 19mm - -
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