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 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 881-7941
製造零件編號CTPROXT50SELV
BrandABB
HK$188.58
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 775-2714
製造零件編號CTSCMICRO19-200/5-T-S
BrandHOBUT
HK$353.69
單位
200:5 - Split Core 78mm 58mm 49mm - - -30°C +55°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 715-7061
製造零件編號56100C
HK$13.81
單位
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS庫存編號 886-2099
製造零件編號XW01-045081S000000
HK$137.32
單位
5:5 - Base Mounted - - - - - - - 62 x 40 x 78 mm - Surface Mount Omega XMER
RS庫存編號 871-1613
製造零件編號B82801B0205A100
BrandEPCOS
HK$10.55
個 (以毎袋:3)
單位
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS庫存編號 257-830
製造零件編號CT173M400/5-2.5/1-002
BrandHOBUT
HK$172.05
單位
400:5 40mm Base Mounted 95mm 70mm 55mm - - -30°C +85°C - - - -
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 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 913-9738
製造零件編號METSECT5CC020
HK$403.88
單位
200:5 21mm Tropicalise - - - - - -25°C +60°C 65 x 44 x 30 mm - DIN Rail -
RS庫存編號 313-817
製造零件編號CT174M600/5-2.5/1-001
BrandHOBUT
HK$180.32
單位
600:5 40mm Base Mounted 95mm 70mm 55mm - - -30°C +85°C - - - -
RS庫存編號 886-2130
製造零件編號XM02-245081S000000
HK$106.70
單位
200:5 21mm Base Mounted - - - - - - - 45 x 40 x 65 mm - Surface Mount Omega XMER
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 832-9863
製造零件編號L01-8004
BrandAlttec
HK$110.89
單位
150:1 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
RS庫存編號 775-4928
製造零件編號AX-1000
HK$25.35
單位
- - - - - - 10A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS庫存編號 751-1614
製造零件編號93481 P1
HK$241.61
單位
- - - - - - 60A - -20°C +70°C 70 (Dia.) x 36 mm - Stand Alone -
RS庫存編號 611-8602
製造零件編號K8ACCT200L
BrandOmron
HK$590.90
毎盒:1 個
Box(es)
- 30mm Surface Mounted 81.5mm 76mm 20mm - - - - - - - -
RS庫存編號 331-480
製造零件編號CTSCM40600/5-5/1
BrandHOBUT
HK$364.29
單位
600:5 - Clip Fit 104.5mm 116mm 35.5mm - - -30°C +80°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 - - - -