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.


...
Read more Read less

Filters

Viewing 41 - 60 of 761 products
Results per page
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 Stock No. 833-2746
Mfr. Part No.DM0T080
BrandLovato
kr 199,76
Each
Units
80:5 22mm Base Mounted 66mm 32mm 44mm - - -25°C +50°C - - - -
RS Stock No. 881-7963
Mfr. Part No.CTPROXT250SELV
BrandABB
kr 379,56
Each
Units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS Stock No. 351-099
Mfr. Part No.MI5
kr 353,71
Each
Units
- - - 45mm 52mm 16mm 0.5 → 5A - -20°C +60°C - - - -
RS Stock No. 399-7317
Mfr. Part No.AS-103
kr 13,96
Each
Units
- - - - - - 15A - -40°C +120°C 17.2 x 20.4 x 9.53 mm - PCB Mount -
RS Stock No. 886-2124
Mfr. Part No.XM02-185071S000000
kr 115,36
Each
Units
100:5 21mm Base Mounted - - - - - - - 45 x 40 x 65 mm - Surface Mount Omega XMER
RS Stock No. 914-5262
Mfr. Part No.CT160-5-F7
BrandHOBUT
kr 230,01
Each
Units
- - - - - - - - -30°C +85°C 60 x 43 x 85 mm - DIN Rail Series 16
RS Stock No. 173-0198
BrandRS PRO
kr 13,23
Each (In a Box of 176)
Units
- - - - - - 30 → 75A - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB Mount -
RS Stock No. 775-2714
Mfr. Part No.CTSCMICRO19-200/5-T-S
BrandHOBUT
kr 499,10
Each
Units
200:5 - Split Core 78mm 58mm 49mm - - -30°C +55°C - - - -
RS Stock No. 729-5517
Mfr. Part No.AC-1100
kr 42,97
Each
Units
- - - - - - 100A - -40°C +120°C 44.5 x 14.3 x 44.5 mm - Through Hole -
RS Stock No. 331-395
Mfr. Part No.CT164M300/5-2.5/1-001
BrandHOBUT
kr 208,07
Each
Units
300:5 28mm DIN Rail Mounted 78mm 60mm 45mm - - -30°C +85°C - - - -
RS Stock No. 124-3890
BrandRS PRO
kr 28,71
Each
Units
- - - - - - 40 → 125A - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS Stock No. 832-9860
Mfr. Part No.L01-8003
BrandAlttec
kr 124,13
Each
Units
100:5 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
RS Stock No. 819-9798
Mfr. Part No.140AS
BrandEfergy
kr 136,20
Each
Units
- 19mm - - - - - - - - - Oscilloscopes - -
RS Stock No. 331-519
Mfr. Part No.CT143M100/5-2.5/1-001
BrandHOBUT
kr 157,23
Each
Units
100:5 24mm DIN Rail Mounted 70mm 49mm 45mm - - -30°C +85°C - - - -
RS Stock No. 124-3895
BrandRS PRO
kr 93,92
Each
Units
- - - - - - 200 → 500A - -55°C +130°C 55.6 x 20.6 x 55.6 mm - PCB Mount -
RS Stock No. 291-1233
Mfr. Part No.01.000158.222
BrandABB
kr 471,35
Each
Units
- 26mm - 82mm 80mm 38mm - - -10°C +60°C - - - -
RS Stock No. 331-345
Mfr. Part No.CT132M80/5-1.5/1
BrandHOBUT
kr 143,87
Each
Units
80:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
RS Stock No. 775-2701
Mfr. Part No.CTSCMICRO19-100/5-T-S
BrandHOBUT
kr 499,10
Each
Units
- - - 78mm 58mm 49mm - - -30°C 55°C - - - -
RS Stock No. 283-6384
Mfr. Part No.26852304
BrandCrouzet
kr 572,58
Each
Units
- 13mm - 39mm 38mm 20mm - - - - - - - -
RS Stock No. 881-7935
Mfr. Part No.CTPROXT300
BrandABB
kr 286,69
Each
Units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
Related Products
Power consumption 2.5VA, 50/60Hz. Accuracy class120, 30 or ...
Description:
Power consumption 2.5VA, 50/60Hz. Accuracy class120, 30 or 40mm busbar mounting. Suitable for circular conductors 35mm aperture. Maximum aperture for bar conductors 40x10mm (type 7)Operating temperature range –30 to +85°CSecondary terminals M5 studs with lock washers, nuts and terminal cover. ...
Split current transformers with unique clip-together feature enabling ...
Description:
Split current transformers with unique clip-together feature enabling high speed permanent installation. Can be installed into existing networks without disconnecting cables or busbars. Ambient temperature range: -30°C to 80°CFrequency range: 50-60Hz. Insulation voltagel: 3kV for 1 minute. Continuous current: 1.2 ...
RS Pro toroidal current sensors are fully encapsulated ...
Description:
RS Pro toroidal current sensors are fully encapsulated for optimal mounting to printed circuit boards. Commonly used to detect branch circuit overload, load drop or shut down, accurate and easy to use. These RS Pro current sensors operate as the ...
RS Pro 50/60 Hz current transformers feature high ...
Description:
RS Pro 50/60 Hz current transformers feature high output voltage in a small package. These transformers have a high saturation current, operating temperature range is -40°C to +120°C. Current measurement. Power monitoring. Instrumentation.