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 719 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. 171-8846
BrandRS PRO
PHP2,015.74
Each
units
100:5 33 x 23mm Base Mounted 106mm 93mm 40mm 100A 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS Stock No. 171-8769
BrandRS PRO
PHP603.00
Each
units
150:5 30 x 10mm Clip Fit 70mm 50mm 31mm 150A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8855
BrandRS PRO
PHP1,024.63
Each
units
5:5 62 x 40mm Clip Fit 78mm 62mm 40mm 5A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8799
BrandRS PRO
PHP1,628.00
Each
units
400:5 41 x 41mm Clip Fit 98mm 74mm 45mm 400A 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
RS Stock No. 171-8857
BrandRS PRO
PHP1,000.08
Each
units
15:5 62 x 40mm Clip Fit 78mm 62mm 40mm 15A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8839
BrandRS PRO
PHP5,180.00
Each
units
2500:5 38 x 128mm Base Mounted 170mm 99mm 45mm 2.5kA 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS Stock No. 171-8817
BrandRS PRO
PHP2,405.00
Each
units
2000:5 80 x 12mm Clip Fit 126mm 104mm 45mm 2kA 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 173-0218
BrandRS PRO
PHP1,320.08
Each (In a Box of 25)
units
- - - - - - 100 → 250A - -55°C +130°C 44.5 x 14.3 x 44.5 mm - PCB Mount -
RS Stock No. 171-8809
BrandRS PRO
PHP1,702.00
Each
units
1500:5 61 x 51mm Clip Fit 110mm 86mm 45mm 1.5kA 5 A -5°C +55°C 86 x 45 x 110 mm - Surface Mount -
RS Stock No. 171-8753
BrandRS PRO
PHP637.29
Each
units
80:5 21 x 10mm Clip Fit 65mm 45mm 40mm 80A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8763
BrandRS PRO
PHP603.00
Each
units
80:5 30 x 10mm Clip Fit 70mm 50mm 31mm 80A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8847
BrandRS PRO
PHP2,015.74
Each
units
150:5 33 x 23mm Base Mounted 106mm 93mm 40mm 150A 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS Stock No. 171-8765
BrandRS PRO
PHP603.00
Each
units
100:5 30 x 10mm Clip Fit 70mm 50mm 31mm 100A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8852
BrandRS PRO
PHP2,983.92
Each
units
500:5 55 x 43mm Base Mounted 125mm 108mm 51mm 500A 5 A +20°C +70°C 108 x 51 x 125 mm - Surface Mount -
RS Stock No. 124-3897
BrandRS PRO
PHP232.96
Each
units
- - - - - - 50A - -40°C +85°C 19 x 11.5 x 21.5 mm - PCB Mount -
RS Stock No. 171-8761
BrandRS PRO
PHP677.35
Each
units
250:5 21 x 10mm Clip Fit 65mm 45mm 40mm 250A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8859
BrandRS PRO
PHP1,000.08
Each
units
30:5 62 x 40mm Clip Fit 78mm 62mm 40mm 30A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 173-0217
BrandRS PRO
PHP1,188.07
Each (In a Box of 114)
units
- - - - - - 75 → 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 124-3899
BrandRS PRO
PHP124.00
Each
units
- - - - - - 7.5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8777
BrandRS PRO
PHP652.87
Each
units
400:5 30 x 10mm Clip Fit 70mm 50mm 31mm 400A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
Related Products
OMEGA 3 Phase current transformers are suitable for ...
Description:
OMEGA 3 Phase current transformers are suitable for primary ranges from 60 A to 630 A with 5 A secondary. The current transformers allow faster installation directly next to the moulded case circuit breakers for optimised use of space. • ...
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 offers these flying lead current transformers ...
Description:
RS Pro offers these flying lead current transformers with high output voltage and linearity in a small size. Integral flying for easy installation 24 AWG 300V rating 250 mm long. All materials UL94-V0. Large centre hole allows 6.3 mm tabs. ...
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 measurementPower monitoringInstrumentation.