Current Transformers

Current transformers or (CT’s) are instruments that are used to transform the current from a high current into a lower current so that the power can then be used for measuring and controlling. The transformers consist of a core, a primary and a secondary winding.RS Components offer an extensive range of highly accurate CT’s in various transformer types, current ratings, CT ratio supply voltages and mounting types to suit every application. Supplied by industry-leading brands including Siemens, Murata Power Solutions LEM and of course RS PRO.

How does a current transformer work?

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.

Types of current transformer

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.

Where would I use a current transformer?

CT's are used in a wide range of industrial and commercial measurement applications. Some of the most common are:Generating stationsElectrical substationsCommercial electric power distributionElectrical panels


...
Read more Read less

Filters

Viewing 1 - 20 of 1084 products
Results per page
Description Price Current Ratio Bore Size Transformer Type Sensor Technology Supply Voltage Input Current Output Current Overall Height Minimum Temperature Overall Width Maximum Temperature Overall Depth Dimensions For Use With
RS Stock No. 793-4584
Mfr. Part No.HLSR 10-P
BrandLEM
$13.87
Each
units
25:1 - - Open Loop 4.5 → 5.5 V 25A 10 A 12mm -40°C 17.2mm +105°C 21mm - -
RS Stock No. 751-1642
Mfr. Part No.93490 P1
$43.37
Each
units
800:1 - - - - 800A - - -20°C - +70°C - 102 (Dia.) x 20 mm -
RS Stock No. 301-9502
Mfr. Part No.HAS 200S
BrandLEM
$38.21
Each
units
600:1 20.4 x 10.4mm - Open Loop 15 V 600A - 30mm -10°C 40mm +80°C 30mm - -
RS Stock No. 537-4491
Mfr. Part No.AC-1010
$6.614
Each (In a Pack of 5)
units
10:1 - - - - 10A - - -40°C - +120°C - 23.8 x 23.8 x 11.12 mm -
RS Stock No. 499-5570
Mfr. Part No.AP 100 B420L
BrandLEM
$290.16
Each
units
100:1 18mm - - 12 → 24 V dc 100A 4 → 20 mA 69mm -20°C 67mm +60°C 55mm - -
RS Stock No. 497-334
Mfr. Part No.HOP 600-SB
BrandLEM
$255.00
Each
units
900:1 41 x 12.5mm - Open Loop 12 → 15 V 900A - 49.8mm -10°C 72mm +70°C 32.4mm - -
RS Stock No. 731-5267
Mfr. Part No.HTA 200-S
BrandLEM
$152.11
Each
units
200:1 32mm - Open Loop ±15 V 200A - 70mm -25°C 90mm +85°C 27.5mm - -
RS Stock No. 832-9851
Mfr. Part No.L01-8002
BrandAlttec
$27.38
Each
units
100:1 21.5mm Clip Fit - - - - 65mm - 45mm +40°C 30mm 65 x 45 x 67 mm -
RS Stock No. 521-936
Mfr. Part No.HASS 400-S
BrandLEM
$38.03
Each
units
900:1 20.4 x 10.4mm - Open Loop 5 V 900A - 30mm -40°C 40mm +85°C 30mm - -
RS Stock No. 532-9110
Mfr. Part No.HXS 20-NP/SP30
BrandLEM
$14.37
Each
units
60:1 - - Open Loop 5 V 60A - 10.7mm -40°C 16.7mm +85°C 18.7mm - -
RS Stock No. 106-8537
Mfr. Part No.56T100C
$2.61
Each (In a Tube of 25)
units
10:1 - - - - 10A - - -40°C - +85°C - 16.79 x 8.89 x 20.19 mm -
RS Stock No. 497-401
Mfr. Part No.LAX 100-NP
BrandLEM
$44.93
Each
units
160:1 - - Closed Loop 11.4 → 15.75 V 160A 50 mA 32mm -40°C 25.5mm +85°C 16.35mm - -
RS Stock No. 124-3893
BrandRS PRO
$10.37
Each
units
1000:1 14.6mm - - - 200A - - -55°C - +130°C - 38.1 x 15.9 x 38.1 mm -
RS Stock No. 715-7077
Mfr. Part No.56T100C
$2.68
Each
units
10:1 - - - - 10A - - -40°C - +85°C - 16.79 x 8.89 x 20.19 mm -
RS Stock No. 819-9779
Mfr. Part No.90AS
BrandEfergy
$24.85
Each
units
- 12mm Split Core - - - - - - - - - - Data Loggers/DAS, Digital or Analog Meters, DMMs, Recorders
RS Stock No. 301-9473
Mfr. Part No.LTS 25NP
BrandLEM
$31.55
Each
units
80:1 3.2mm - Closed Loop 5 V 80A - 24mm -40°C 22.2mm +85°C 10mm - -
RS Stock No. 399-7244
Mfr. Part No.ASM-010
$8.52
Each
units
10:1 - - - - 10A - - -40°C - +120°C - 20.4 x 17.2 x 9.53 mm -
RS Stock No. 436-2330
Mfr. Part No.LTS 6NP
BrandLEM
$27.17
Each
units
19.2:1 3.2mm - Closed Loop 5 V 19.2A - 24mm -40°C 22.2mm +85°C 10mm - -
RS Stock No. 124-3879
BrandRS PRO
$2.57
Each
units
50:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0041
BrandRS PRO
$1.994
Each (In a Box of 351)
units
50:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -