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 81 - 100 of 726 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. 171-8776
BrandRS PRO
MYR104.70
Each
units
400:1 30 x 10mm - 70mm 50mm 30mm - - - - 50 x 30 x 70 mm - - -
RS Stock No. 171-8805
BrandRS PRO
MYR158.37
Each
units
1000:5 61 x 51mm Clip Fit 110mm 86mm 45mm 1kA 5 A -5°C +55°C 86 x 45 x 110 mm - Surface Mount -
RS Stock No. 173-0220
BrandRS PRO
MYR113.243
Each (In a Box of 140)
units
- - - - - - 25A - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS Stock No. 171-8788
BrandRS PRO
MYR71.42
Each
units
250:5 40 x 11mm Clip Fit 78mm 62mm 40mm 250A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 173-0219
BrandRS PRO
MYR125.823
Each (In a Box of 18)
units
- - - - - - 200 → 500A - -55°C +130°C 55.6 x 20.6 x 55.6 mm - PCB Mount -
RS Stock No. 171-8852
BrandRS PRO
MYR254.51
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. 171-8809
BrandRS PRO
MYR162.22
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. 124-3897
BrandRS PRO
MYR21.05
Each
units
- - - - - - 50A - -40°C +85°C 19 x 11.5 x 21.5 mm - PCB Mount -
RS Stock No. 171-8771
BrandRS PRO
MYR57.87
Each
units
200:5 30 x 10mm Clip Fit 70mm 50mm 31mm 200A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 173-0184
BrandRS PRO
MYR90.547
Each (In a Box of 98)
units
- - - - - - 5 → 50A - -40°C +120°C 32 x 20.5 x 35 mm - PCB Mount -
RS Stock No. 173-0235
BrandRS PRO
MYR156.164
Each (In a Box of 351)
units
- - - - - - 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8758
BrandRS PRO
MYR63.84
Each
units
150:5 21 x 10mm Clip Fit 65mm 45mm 40mm 150A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8800
BrandRS PRO
MYR160.46
Each
units
500:5 41 x 41mm Clip Fit 98mm 74mm 45mm 500A 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
RS Stock No. 171-8798
BrandRS PRO
MYR78.99
Each
units
800:5 40 x 11mm Clip Fit 78mm 62mm 40mm 800A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 173-0216
BrandRS PRO
MYR113.243
Each (In a Box of 351)
units
- - - - - - 7.5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8782
BrandRS PRO
MYR107.56
Each
units
125:5 30 x 11mm Clip Fit 78mm 62mm 40mm 125A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8855
BrandRS PRO
MYR94.23
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. 171-8789
BrandRS PRO
MYR71.42
Each
units
300:5 40 x 11mm Clip Fit 78mm 62mm 40mm 300A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 173-0237
BrandRS PRO
MYR132.739
Each (In a Box of 351)
units
- - - - - - 10 → 20A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8838
BrandRS PRO
MYR458.47
Each
units
2000:5 38 x 128mm Base Mounted 170mm 99mm 45mm 2kA 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
Related Products
Window type current transformers from Siemens offer a ...
Description:
Window type current transformers from Siemens offer a wide current range, depending on model. • Screw-type terminals• 50-1500 A current range• IP20 protection.
OMEGA XMER Current transformers are square type and ...
Description:
OMEGA XMER Current transformers are square type and encapsulated with UL94V-0 approved polycarbonate. These metering CT’s feature sealable terminal covers and a wide range of primary current ratings. Available in various bus bar sizes, case widths and mounting options. Cost ...
Residual-current transformer for residual current monitoring Bushing opening ...
Description:
Residual-current transformer for residual current monitoring Bushing opening 140 mm Residual current 30 mA...40 A.
Pin-winding increases the primary current of the current ...
Description:
Pin-winding increases the primary current of the current transformer. Consequently, window-type current transformers Can also be used for low primary currents.