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 361 - 380 of 1097 products
Results per page
Description Price Current Ratio Bore Size Transformer Type Overall Height Sensor Technology Overall Width Supply Voltage Input Current Overall Depth Output Current Minimum Temperature Maximum Temperature Dimensions For Use With
RS Stock No. 189-5477
Mfr. Part No.CSNE151
BrandHoneywell
HK$297.85
Each
units
36:1 - - 28mm Closed Loop 28mm 15 V 36A 16.8mm 25 mA 0°C +70°C - -
RS Stock No. 123-6718
Mfr. Part No.XN35-205031S000000
HK$229.54
Each
units
125:5 31mm Base Mounted - - - - 125A - 5 A - - 105 x 38 x 87.5 mm MCCB
RS Stock No. 477-4749
Mfr. Part No.CSNS300F
BrandHoneywell
HK$936.40
Each
units
600:1 26mm - 61.2mm Closed Loop 67.5mm 15 V 600A 17.9mm 150 mA -40°C +85°C - -
RS Stock No. 250-0142
Mfr. Part No.TRA12UN100
BrandCarel
HK$83.12
Each
units
- - - 47mm - 58mm - - 33mm - - - - 12/24Vac controllers
RS Stock No. 175-6213
Mfr. Part No.4NC5438-0CJ21
BrandSiemens
HK$1,162.88
Each
units
2000:1 - Window 84.1mm - 112mm - 2000A 127.5mm 1 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices
RS Stock No. 171-8850
BrandRS PRO
HK$374.83
Each
units
300:5 33 x 23mm Base Mounted 106mm - 93mm - 300A 40mm 5 A +20°C +70°C 93 x 40 x 106 mm -
New
RS Stock No. 200-3801
Mfr. Part No.HOYL 400-S-0100
BrandLEM
HK$484.94
Each
units
400:1 - Base Mounted - Open Loop - +5 V 400A - - - - - -
RS Stock No. 124-3902
BrandRS PRO
HK$28.05
Each
units
50:1 - - - - - - 50A - - -40°C +85°C 23.8 x 11.12 x 23.8 mm -
RS Stock No. 171-8771
BrandRS PRO
HK$88.74
Each
units
200:5 30 x 10mm Clip Fit 70mm - 50mm - 200A 31mm 5 A -5°C +55°C 50 x 31 x 70 mm -
RS Stock No. 198-4508
Mfr. Part No.METSECT5MD060
HK$675.42
Each
units
600:5 40mm Tropicalise 95mm - 70mm - 600A 65mm 5 A -25°C +60°C - -
RS Stock No. 136-2035
Mfr. Part No.TLI4970D025T4XUMA1
BrandInfineon
HK$61.86
Each
units
20:1 - - 7mm - 7mm 3.1 → 3.5 V 20A 1mm - -40°C +85°C - -
RS Stock No. 122-0464
Mfr. Part No.192T2110
BrandSocomec
HK$162.87
Each
units
- 17.5mm - - - - - - - - - - 65 x 49.5 x 50 mm -
RS Stock No. 175-6140
Mfr. Part No.4NC5121-0CC21
BrandSiemens
HK$528.28
Each
units
150:1 - Window 65.6mm - 60mm - 150A 75.3mm 1 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS Stock No. 181-0001
Mfr. Part No.MR-4
BrandKEMET
HK$127.30
Each (In a Box of 50)
units
- 16.5mm - - - - - - - - - - - -
RS Stock No. 123-6743
Mfr. Part No.XS03-435145S 000000
HK$583.57
Each
units
1600:5 120 x 80mm Clip Fit - - - - - - - - - 155 x 40 x 198 mm -
RS Stock No. 917-6531
Mfr. Part No.LT6CT2001
HK$617.76
Each
units
- - - - - - - - - - - - 107 x 95 x 25 mm -
RS Stock No. 136-1510
Mfr. Part No.TLV493DA1B6HTSA2
BrandInfineon
HK$4.817
Each (On a Reel of 3000)
units
3.7 mA - - 2.9mm - 1.6mm 2.8 → 3.5 V 3.7mA 1mm - -40°C +125°C - -
RS Stock No. 331-389
Mfr. Part No.CT143M300/5-5/1-001
BrandHOBUT
HK$164.25
Each
units
300:5 24mm DIN Rail Mounted 70mm - 49mm - 300A 45mm 5 A -30°C +85°C - -
RS Stock No. 136-6369
Mfr. Part No.XM22-415151S000000
HK$254.60
Each
units
1250:5 72mm - 104mm - 104mm - 1250A 45mm 5 A - - 104 x 45 x 104 mm -
RS Stock No. 173-0066
Mfr. Part No.AZ-0500
HK$44.223
Each (In a Box of 84)
units
25:1 - - - - - - 25A - - -40°C +85°C 19.0 x 11.5 x 21.5 mm -
Related Products
Corcom filters are recognized worldwide for providing EMI/RFI ...
Description:
Corcom filters are recognized worldwide for providing EMI/RFI filtering solutions. TE offers over 70 Corcom filter series that are suitable for a wide range of applications across multiple industries. All Corcom filters have been designed and tested for susceptibility and/or ...
Schaffner FN 3270 series 3-phase filters are an ...
Description:
Schaffner FN 3270 series 3-phase filters are an extremely compact and lightweight design requiring minimum mounting space in installations and cabinets. Installation is quick and simple – allowing for ease of access when fitting with automatic or with hand tools. ...
FN352Z brings exceptional conducted attenuation performance, based on ...
Description:
FN352Z brings exceptional conducted attenuation performance, based on multi-stage design and chokes with high saturation resistance and excellent thermal behaviour. Additional high surge pulse voltage protection up to 2 kA is integrated to protect sensitive equipment.Can be used in a ...
Brought to you by Block, this range of ...
Description:
Brought to you by Block, this range of Safety Isolating Transformers are short-circuit proof and feature thermal overload protection. The single phase transformers are provided with mounting holes for easy installation, and have two independent secondary windings, which may be ...