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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RS Stock No. 171-8787
Brand :RS PRO
THB483.43
Each
Units
200:5 40 x 11mm Clip Fit 78mm 62mm 40mm 200A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8784
Brand :RS PRO
THB641.83
Each
Units
300:5 30 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. 173-0197
Brand :RS PRO
THB157.654
Each (In a Box of 176)
Units
- - - - - - 25 → 75A - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB Mount -
RS Stock No. 171-8813
Brand :RS PRO
THB1,003.04
Each
Units
1200:5 80 x 12mm Clip Fit 126mm 104mm 45mm 1.2kA 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 171-8817
Brand :RS PRO
THB1,293.74
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. 171-8838
Brand :RS PRO
THB3,542.65
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 -
RS Stock No. 171-8799
Brand :RS PRO
THB890.87
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. 171-8831
Brand :RS PRO
THB1,000.98
Each
Units
300:5 45mm Base Mounted 102.5mm 141mm 38mm 300A 5 A - - 141 x 38 x 102.5 mm MCCB Surface Mount -
RS Stock No. 171-8814
Brand :RS PRO
THB1,094.60
Each
Units
1250:5 80 x 12mm Clip Fit 126mm 104mm 45mm 1.25kA 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 171-8765
Brand :RS PRO
THB343.35
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. 171-8844
Brand :RS PRO
THB2,587.47
Each
Units
2000:5 101 x 56mm Clip Fit 170mm 130mm 60mm 2kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 171-8826
Brand :RS PRO
THB874.39
Each
Units
150:5 35mm Base Mounted 87.5mm 105mm 38mm 150A 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 171-8775
Brand :RS PRO
THB396.00
Each
Units
300:5 30 x 10mm Clip Fit 70mm 50mm 31mm 300A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8840
Brand :RS PRO
THB1,945.64
Each
Units
1000:5 101 x 56mm Clip Fit 170mm 130mm 60mm 1kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 171-8763
Brand :RS PRO
THB343.35
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. 171-8850
Brand :RS PRO
THB1,501.45
Each
Units
300:5 33 x 23mm Base Mounted 106mm 93mm 40mm 300A 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS Stock No. 171-8757
Brand :RS PRO
THB596.97
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 171-8846
Brand :RS PRO
THB1,281.17
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. 171-8778
Brand :RS PRO
THB438.36
Each
Units
500:5 30 x 10mm Clip Fit 70mm 50mm 31mm 500A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 124-3899
Brand :RS PRO
THB134.59
Each
Units
- - - - - - 7.5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
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