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 701 - 720 of 766 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. 175-6158
Mfr. Part No.4NC5222-0CE21
BrandSiemens
PHP3,939.08
Each
units
200:1 30mm Window 67.6mm 60.6mm 78.4mm 200A 1 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 832-9835
Mfr. Part No.L01-8500
BrandAlttec
PHP1,583.61
Each
units
40:5 28mm Clip Fit 78.5mm 61mm 40mm - - - +40°C 78.5 x 61 x 72 mm - - -
RS Stock No. 123-9526
Mfr. Part No.4NC5325-2CE20
BrandSiemens
PHP4,884.69
Each
units
400:5 36mm Window - - - 400A 5 A -10°C 55°C 82.5 x 80 x 98 mm Measuring Devices Panel Mount 4NC
RS Stock No. 291-1227
Mfr. Part No.01.000158.221
BrandABB
PHP4,907.25
Each
units
- 26mm - 82mm 80mm 38mm - - -10°C +60°C - - - -
RS Stock No. 123-6732
Mfr. Part No.XS01-275071S 000000
PHP2,246.92
Each
units
250:5 - Base Mounted - - - 250A 5 A +20°C +70°C - - Plug In Omega
RS Stock No. 124-2467
Mfr. Part No.P01379610
PHP13,443.20
1 Set
Set(s)
60:1 17mm Split Core - - - 60A 1 A -20°C +50°C 33.08 x 34.4 x 64.1 mm ENERIUM Power Monitors, ULYS Submeters Plug In TC CLIP
RS Stock No. 175-6146
Mfr. Part No.4NC5122-0DE21
BrandSiemens
PHP4,183.85
Each
units
200:1 20mm Window 65.6mm 60mm 75.3mm 200A 1 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 917-6531
Mfr. Part No.LT6CT2001
PHP4,202.22
Each
units
- - - - - - - - - - 107 x 95 x 25 mm - - -
RS Stock No. 294-9266
Mfr. Part No.CTRA8120/5-2.5/1-1809
BrandHOBUT
PHP1,609.18
Each
units
- - - - - 70mm - - -30°C +85°C - 5A Moving Iron Meters - -
RS Stock No. 775-4931
Mfr. Part No.ACX-1100
PHP296.49
Each
units
- - - - - - 100A - -40°C +85°C 34.9 x 34.9 x 14.3 mm - - -
RS Stock No. 175-6204
Mfr. Part No.4NC5433-2DH21
BrandSiemens
PHP6,204.62
Each
units
1200:5 - Window 84.1mm 112mm 127.5mm 1.2kA 5 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6160
Mfr. Part No.4NC5222-2CE21
BrandSiemens
PHP3,569.08
Each
units
200:5 - Window 67.6mm 60.6mm 78.4mm 200A 5 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 775-4921
Mfr. Part No.AX-1500
PHP235.79
Each
units
- - - - - - 15A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS Stock No. 175-6189
Mfr. Part No.4NC5327-2DE21
BrandSiemens
PHP4,183.85
Each
units
600:5 - Window 84.1mm 82.5mm 98mm 600A 5 A -30°C +55°C 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 331-569
Mfr. Part No.CT143M500/5-5/0.5-001
BrandHOBUT
PHP1,212.42
Each
units
500:5 24mm DIN Rail Mounted 70mm 49mm 45mm - - -30°C +85°C - - - -
RS Stock No. 313-823
Mfr. Part No.CT174M800/5-2.5/1-001
BrandHOBUT
PHP1,566.15
Each
units
800:5 40mm Base Mounted 95mm 70mm 55mm - - -30°C +85°C - - - -
New
RS Stock No. 198-4479
Mfr. Part No.METSECT5DC250
PHP9,085.31
Each
units
2500:5 - Tropicalise 160mm 125mm 87mm 2.5kA 5 A -25°C +50°C - - Surface Mount -
RS Stock No. 136-6364
Mfr. Part No.XM07-315091S000000
PHP719.05
Each
units
400:5 26mm - 70mm 50mm 44.5mm 400A 5 A - - 50 x 44.5 x 70 mm - BusBar, Cable Mount, DIN Rail, Wall Mount Omega
RS Stock No. 175-6144
Mfr. Part No.4NC5121-2FA21
BrandSiemens
PHP4,183.85
Each
units
150:5 - Window 65.6mm 60mm 75.3mm 150A 5 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 123-6736
Mfr. Part No.XS02-325075S 000000
PHP2,640.39
Each
units
500:5 80 x 50mm Clip Fit - - - - - - - 125 x 40 x 158 mm - Surface Mount Omega10
Related Products
The Texas Instruments F2806x Piccolo™ family of microcontrollers ...
Description:
The Texas Instruments F2806x Piccolo™ family of microcontrollers provides the power of the C28x™ with highly integrated control peripherals in low pin-count packages. The family is code-compatible with previous C28x-based code and provides a high level of analogue integration.
RS Pro PCB mount current transformers encapsulated in ...
Description:
RS Pro PCB mount current transformers encapsulated in UL94 V0 rated plastic Storage temperature -55°C to +130°C, fully RoHS compliant. Ground fault detectionMeteringAnalog to digital circuitsSensing overload current.
RS Pro high current transformers feature a primary ...
Description:
RS Pro high current transformers feature a primary current range 50-150A, 1% accuracy. These current transformers also have dielectric with stand voltage 4KVrms, operating frequency 50/60 Hz, rated burden resistance 33 Ω, all materials UL94-VO and operating temperature -40°C to ...
RS Pro PCB mount current transformers encapsulated in ...
Description:
RS Pro PCB mount current transformers encapsulated in UL94 V0 rated plastic Storage temperature -55°C to +130°C, fully RoHS compliant. Ground fault detectionMeteringAnalog to digital circuitsSensing overload current.