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庫存編號 668-4067
製造零件編號CT105F250/5-2.5/1
BrandHOBUT
HK$358.02
單位
250:5 21mm Base Mounted 79mm 105mm 53mm - - -30°C +80°C - - - -
RS庫存編號 331-339
製造零件編號CT132M100/5-2.5/1
BrandHOBUT
HK$144.47
單位
100:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
RS庫存編號 913-9734
製造零件編號METSECT5CC013
HK$388.12
單位
125:5 21mm Tropicalise - - - - - -25°C +60°C 65 x 44 x 30 mm - DIN Rail -
RS庫存編號 537-4485
製造零件編號AC-1005
HK$18.782
/個 (每包:5個)
單位
- - - - - - 5A - -40°C +120°C 23.8 x 23.8 x 11.12 mm - PCB Mount -
RS庫存編號 533-0621
製造零件編號CTSCEN200<1000/5
BrandHOBUT
HK$685.79
單位
200:5, 400:5, 600:5, 800:5, 1000:5 - Clip Fit 125mm 132mm 38mm - - -30°C +80°C - - - -
RS庫存編號 775-4934
製造零件編號ACX-1050
HK$25.30
單位
- - - - - - 50A - -40°C +85°C 23.8 x 23.8 x 11.12 mm - - -
RS庫存編號 173-0064
製造零件編號ACX-1050
HK$29.969
個 (以毎盒:240)
單位
- - - - - - 50A - -40°C +85°C 23.8 x 23.8 x 11.12 mm - - -
RS庫存編號 819-9779
製造零件編號Mini CT Sensor
BrandEfergy
HK$100.80
單位
- 12mm Split Core - - - - - - - - Data Loggers/DAS, Digital or Analog Meters, DMMs, Recorders - -
RS庫存編號 331-519
製造零件編號CT143M100/5-2.5/1-001
BrandHOBUT
HK$128.89
單位
100:5 24mm DIN Rail Mounted 70mm 49mm 45mm - - -30°C +85°C - - - -
RS庫存編號 668-4064
製造零件編號CT105F200/5-2.5/1
BrandHOBUT
HK$381.48
單位
200:5 21mm Base Mounted 79mm 105mm 53mm - - -30°C +80°C - - - -
RS庫存編號 668-4055
製造零件編號CT105F150/5-2.5/1
BrandHOBUT
HK$329.56
單位
150:5 21mm Base Mounted 79mm 105mm 53mm - - -30°C +80°C - - - -
RS庫存編號 914-5294
製造零件編號CTSCMWH60/0.333V
BrandHOBUT
HK$146.78
單位
- 10mm Split Core - - - 60A 333 mV -15°C +50°C 28.7 x 26.4 x 41.7 mm Multi Function Meter Cable -
RS庫存編號 331-575
製造零件編號CTSCM40500/5-5/1
BrandHOBUT
HK$371.48
單位
500:5 - Clip Fit 116mm 104.5mm 35.5mm - - -30°C +80°C - - - -
RS庫存編號 914-5301
製造零件編號CTSCMWH500/0.333V
BrandHOBUT
HK$275.20
單位
- 35mm Split Core - - - 500A 333 mV -15°C +50°C 51.2 x 51.2 x 83.5 mm Multi Function Meter Cable -
RS庫存編號 533-0643
製造零件編號CTSCM40-200/5
BrandHOBUT
HK$383.47
單位
200:5 - Clip Fit 104.5mm 116mm 35.5mm - - -30°C +80°C - - - -
RS庫存編號 331-604
製造零件編號CTSCM40400/5-5/1
BrandHOBUT
HK$371.48
單位
400:5 - Clip Fit 116mm 104.5mm 35.5mm - - -30°C +80°C - - - -
RS庫存編號 331-581
製造零件編號CTSCM40300/5-2.5/1
BrandHOBUT
HK$318.32
單位
300:5 - Clip Fit 116mm 104.5mm 35.5mm - - -30°C +80°C - - - -
RS庫存編號 418-3604
製造零件編號CTSCEN100<400/5
BrandHOBUT
HK$690.49
單位
100:5, 200:5, 300:5, 400:5 - Clip Fit 113mm 127mm 40mm - - -30°C +80°C - - - -
RS庫存編號 775-4947
製造零件編號AP-1500
HK$35.36
單位
- - - - - - 10A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS庫存編號 913-9731
製造零件編號METSECT5CC005
HK$369.21
單位
50:5 21mm Tropicalise - - - - - -25°C +60°C 65 x 44 x 30 mm - DIN Rail -