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 886-2162
製造零件編號XM19-285111S000000
HK$205.11
單位
300:5 50mm Base Mounted - - - - - - - 86 x 45 x 110 mm - Surface Mount Omega XMER
RS庫存編號 775-2701
製造零件編號CTSCMICRO19-100/5-T-S
BrandHOBUT
HK$371.48
單位
- - - 78mm 58mm 49mm - - -30°C 55°C - - - -
RS庫存編號 881-7913
製造零件編號CTPROXT60
BrandABB
HK$170.36
單位
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
RS庫存編號 313-801
製造零件編號CT174M500/5-2.5/1-001
BrandHOBUT
HK$88.53
單位
500:5 40mm Base Mounted 95mm 70mm 55mm - - -30°C +85°C - - - -
RS庫存編號 331-547
製造零件編號CT164M400/5-5/1-001
BrandHOBUT
HK$182.07
單位
400:5 28mm DIN Rail Mounted 78mm 60mm 45mm - - -30°C +85°C - - - -
RS庫存編號 886-2134
製造零件編號XM02-285081S000000
HK$106.70
單位
300:5 21mm Base Mounted - - - - - - - 45 x 40 x 65 mm - Surface Mount Omega XMER
RS庫存編號 886-2171
製造零件編號XM19-315131S000000
HK$205.11
單位
400:5 50mm Base Mounted - - - - - - - 86 x 45 x 110 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$351.74
單位
100:5 21mm Base Mounted 79mm 105mm 53mm - - -30°C +80°C - - - -
RS庫存編號 287-3232
製造零件編號CT153M500/5-2.5/1
BrandHOBUT
HK$152.76
單位
500:5 26mm Universal Mounted 75mm 54.5mm 68mm - - -20°C +70°C - - - -
RS庫存編號 331-373
製造零件編號CT164M500/5-5/0.5-001
BrandHOBUT
HK$169.33
單位
500:5 28mm DIN Rail Mounted 78mm 60mm 45mm - - -30°C +85°C - - - -
RS庫存編號 173-0061
製造零件編號AC-1100
HK$26.715
個 (以毎盒:27)
單位
- - - - - - 100A - -40°C +120°C 44.5 x 14.3 x 44.5 mm - Through Hole -
RS庫存編號 510-9152
製造零件編號7KT1201
BrandSiemens
HK$1,270.13
單位
- 13mm Straight Through - - - - - - - - - DIN Rail -
RS庫存編號 313-823
製造零件編號CT174M800/5-2.5/1-001
BrandHOBUT
HK$191.76
單位
800:5 40mm Base Mounted 95mm 70mm 55mm - - -30°C +85°C - - - -
RS庫存編號 729-5517
製造零件編號AC-1100
HK$35.36
單位
- - - - - - 100A - -40°C +120°C 44.5 x 14.3 x 44.5 mm - Through Hole -
RS庫存編號 715-7068
製造零件編號56050C
HK$13.63
單位
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS庫存編號 287-3197
製造零件編號CT153M200/5-2.5/1
BrandHOBUT
HK$129.53
單位
200:5 26mm Universal Mounted 75mm 54.5mm 68mm - - -20°C +70°C - - - -
RS庫存編號 886-2102
製造零件編號XW01-075081S000000
HK$157.50
單位
15:5 - Base Mounted - - - - - - - 62 x 40 x 78 mm - Surface Mount Omega XMER
RS庫存編號 833-2759
製造零件編號DM2T0150
BrandLovato
HK$172.32
單位
150:5 23mm Base Mounted 65.5mm 52mm 46.5mm - - -25°C +50°C - - - -
RS庫存編號 175-6124
製造零件編號3UL2304-1A
BrandSiemens
HK$1,615.52
單位
- - Toroidal Ring 64mm 124.5mm 130mm 30 mA → 40 A 225 A -25°C +60°C 124.5 x 130 x 64 mm Fault Current Monitoring Chassis Mount -
RS庫存編號 833-2762
製造零件編號DM3T0600
BrandLovato
HK$328.16
單位
600:5 30mm Base Mounted 81.5mm 71mm 62.5mm - - -25°C +50°C - - - -