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 611-8602
製造零件編號K8ACCT200L
BrandOmron
HK$621.76
毎盒:1 個
Box(es)
- 30mm Toroidal Ring 81.5mm 76mm 20mm - - - - - - - -
RS庫存編號 886-2134
製造零件編號XM02-285081S000000
HK$115.20
單位
300:5 21mm Base Mounted - - - - - - - 45 x 40 x 65 mm - Surface Mount Omega XMER
RS庫存編號 668-4051
製造零件編號CT105F100/5-2.5/1
BrandHOBUT
HK$349.61
單位
100:5 21mm Base Mounted 79mm 105mm 53mm - - -30°C +80°C - - - -
RS庫存編號 775-2701
製造零件編號CTSCMICRO19-100/5-T-S
BrandHOBUT
HK$440.35
單位
- - - 78mm 58mm 49mm - - -30°C 55°C - - - -
RS庫存編號 331-553
製造零件編號CT143M200/5-2.5/1-001
BrandHOBUT
HK$156.78
單位
200:5 24mm DIN Rail Mounted 70mm 49mm 45mm - - -30°C +85°C - - - -
RS庫存編號 167-0135
製造零件編號B82801B0205A100
BrandEPCOS
HK$11.532
個 (在毎卷:900)
單位
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS庫存編號 751-1614
製造零件編號93481 P1
HK$194.14
單位
- - - - - - 60A - -20°C +70°C 70 (Dia.) x 36 mm - Stand Alone -
RS庫存編號 881-7913
製造零件編號CTPROXT60
BrandABB
HK$173.77
單位
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
RS庫存編號 331-547
製造零件編號CT164M400/5-5/1-001
BrandHOBUT
HK$195.52
單位
400:5 28mm DIN Rail Mounted 78mm 60mm 45mm - - -30°C +85°C - - - -
RS庫存編號 173-0057
製造零件編號AX-1000
HK$27.545
個 (以毎盒:250)
單位
- - - - - - 10A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS庫存編號 886-2162
製造零件編號XM19-285111S000000
HK$217.82
單位
300:5 50mm Base Mounted - - - - - - - 86 x 45 x 110 mm - Surface Mount Omega XMER
RS庫存編號 715-7061
製造零件編號56100C
HK$13.86
單位
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS庫存編號 331-480
製造零件編號CTSCM40600/5-5/1
BrandHOBUT
HK$432.88
單位
600:5 - Clip Fit 104.5mm 116mm 35.5mm - - -30°C +80°C - - - -
RS庫存編號 775-4928
製造零件編號AX-1000
HK$30.77
單位
- - - - - - 10A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS庫存編號 881-7941
製造零件編號CTPROXT50SELV
BrandABB
HK$231.66
單位
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS庫存編號 175-6145
製造零件編號4NC5122-0CE21
BrandSiemens
HK$566.67
單位
200:1 20mm Window 65.6mm 60mm 75.3mm 200A 1 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS庫存編號 123-9517
製造零件編號4NC5222-0CE20
BrandSiemens
HK$679.77
單位
200:1 28mm Window - - - 200A 1 A -10°C 55°C 80 x 64 x 85.5 mm Measuring Devices Panel Mount 4NC
RS庫存編號 123-9526
製造零件編號4NC5325-2CE20
BrandSiemens
HK$721.50
單位
400:5 36mm Window - - - 400A 5 A -10°C 55°C 82.5 x 80 x 98 mm Measuring Devices Panel Mount 4NC
RS庫存編號 175-6146
製造零件編號4NC5122-0DE21
BrandSiemens
HK$601.96
單位
200:1 20mm Window 65.6mm 60mm 75.3mm 200A 1 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS庫存編號 123-6746
製造零件編號XS04-485155S 000000
HK$1,048.97
單位
3000:5 160 x 80mm Clip Fit - - - - - - - 195 x 64 x 245 mm - Surface Mount Omega10