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 1 - 20 of 53 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. 913-9738
Mfr. Part No.METSECT5CC020
TWD1,844.00
Each
units
200:5 21mm Toroidal Ring - - - - - -25°C +60°C 65 x 44 x 30 mm - DIN Rail -
RS Stock No. 913-9731
Mfr. Part No.METSECT5CC005
TWD1,709.00
Each
units
50:5 21mm Toroidal Ring - - - - - -25°C +60°C 65 x 44 x 30 mm - DIN Rail -
New
RS Stock No. 198-4479
Mfr. Part No.METSECT5DC250
TWD5,257.00
Each
units
2500:5 - Tropicalise 160mm 125mm 87mm 2.5kA 5 A -25°C +50°C - - Surface Mount -
New
RS Stock No. 198-4469
Mfr. Part No.METSECT5DA125
TWD2,899.00
Each
units
1250:5 - Tropicalise 94mm 90mm 87mm 1.25kA 5 A -25°C +60°C - - Surface Mount -
New
RS Stock No. 198-4464
Mfr. Part No.METSECT5CC015
TWD1,557.00
Each
units
150:5 21mm Tropicalise 65mm 44mm 37mm 150A 5 A -25°C +60°C - - DIN rail -
RS Stock No. 917-6531
Mfr. Part No.LT6CT2001
TWD2,428.00
Each
units
- - - - - - - - - - 107 x 95 x 25 mm - - -
New
RS Stock No. 198-4491
Mfr. Part No.METSECT5DH200
TWD4,347.00
Each
units
2000:5 - Tropicalise 129mm 98mm 40mm 2kA 5 A -25°C +50°C - - Surface Mount -
New
RS Stock No. 198-4467
Mfr. Part No.METSECT5DA080
TWD2,687.00
Each
units
800:5 - Tropicalise 94mm 90mm 87mm 800A 5 A -25°C +60°C - - Surface Mount -
New
RS Stock No. 198-4512
Mfr. Part No.METSECT5VV600
TWD25,779.00
Each
units
6000:5 - Tropicalise 242mm 175mm 110mm 6kA 5 A -25°C +50°C - - Surface Mount -
New
RS Stock No. 198-4507
Mfr. Part No.METSECT5MD050
TWD2,460.00
Each
units
500:5 40mm Tropicalise 95mm 70mm 65mm 500A 5 A -25°C +60°C - - DIN rail -
New
RS Stock No. 198-4485
Mfr. Part No.METSECT5DE100
TWD3,438.00
Each
units
1000:5 - Tropicalise 129mm 135mm 85mm 1kA 5 A -25°C +50°C - - Surface Mount -
New
RS Stock No. 198-4496
Mfr. Part No.METSECT5MA040
TWD1,935.00
Each
units
400:5 27mm Tropicalise 80mm 56mm 63mm 400A 5 A -25°C +60°C - - DIN rail -
New
RS Stock No. 198-4480
Mfr. Part No.METSECT5DC300
TWD5,534.00
Each
units
3000:5 - Tropicalise 160mm 125mm 87mm 3kA 5 A -25°C +50°C - - Surface Mount -
New
RS Stock No. 198-4484
Mfr. Part No.METSECT5DD150
TWD3,694.00
Each
units
1500:5 - Tropicalise 116mm 96mm 78.4mm 1.5kA 5 A -25°C +50°C - - Surface Mount -
New
RS Stock No. 198-4510
Mfr. Part No.METSECT5VV500
TWD25,779.00
Each
units
5000:5 - Tropicalise 242mm 175mm 110mm 5kA 5 A -25°C +50°C - - Surface Mount -
New
RS Stock No. 198-4509
Mfr. Part No.METSECT5MD080
TWD2,660.00
Each
units
800:5 40mm Tropicalise 95mm 70mm 65mm 800A 5 A -25°C +60°C - - DIN rail -
New
RS Stock No. 198-4487
Mfr. Part No.METSECT5DE150
TWD4,025.00
Each
units
1500:5 - Tropicalise 129mm 135mm 85mm 1.5kA 5 A -25°C +50°C - - Surface Mount -
New
RS Stock No. 198-4499
Mfr. Part No.METSECT5MB030
TWD2,009.00
Each
units
300:5 26mm Tropicalise 85mm 60mm 63mm 300A 5 A -25°C +60°C - - DIN rail -
New
RS Stock No. 198-4474
Mfr. Part No.METSECT5DB200
TWD4,514.00
Each
units
2000:5 - Tropicalise 160mm 99mm 78.4mm 2kA 5 A -25°C +60°C - - Surface Mount -
New
RS Stock No. 198-4494
Mfr. Part No.METSECT5MA025
TWD1,859.00
Each
units
250:5 27mm Tropicalise 80mm 56mm 63mm 250A 5 A -25°C +60°C - - DIN rail -