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 21 - 40 of 1110 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. 533-0621
Mfr. Part No.CTSCEN200<1000/5
BrandHOBUT
MYR446.32
Each
units
200:5, 400:5, 600:5, 800:5, 1000:5 - Clip Fit - - - - 125mm -30°C 132mm +80°C 38mm - -
RS Stock No. 301-9502
Mfr. Part No.HAS 200S
BrandLEM
MYR118.08
Each
units
600:1 20.4 x 10.4mm - Open Loop 15 V 600A - 30mm -10°C 40mm +80°C 30mm - -
RS Stock No. 180-7357
Mfr. Part No.LA 55-P
BrandLEM
MYR133.13
Each
units
70:1 - - Closed Loop 12 → 15 V 70A 50 mArms 27.6mm -40°C 36.6mm +85°C 14.45mm - -
RS Stock No. 775-2705
Mfr. Part No.CTSCMICRO19-150/5-T-S
BrandHOBUT
MYR268.67
Each
units
- - - - - - - 78mm -30°C 58mm 55°C 49mm - -
RS Stock No. 793-4632
Mfr. Part No.ATO-75BILD10
BrandLEM
MYR180.10
Each
units
90:1 10mm - - - 90A 90 mA 48.5mm -25°C 33.5mm +70°C 32mm - -
RS Stock No. 446-0636
Mfr. Part No.DK 300 B420
BrandLEM
MYR2,453.62
Each
units
300:1 21.7mm - - 20 → 50 V dc, 22 → 38 V ac 300A 4 → 20 mA 57.2mm -20°C 89.7mm +50°C 30mm - -
RS Stock No. 198-841
Mfr. Part No.AT 5 B5
BrandLEM
MYR297.91
Each
units
5:1 16mm - - - 5A - 67mm -20°C 44.5mm +60°C 36.5mm - -
RS Stock No. 775-2701
Mfr. Part No.CTSCMICRO19-100/5-T-S
BrandHOBUT
MYR268.67
Each
units
- - - - - - - 78mm -30°C 58mm 55°C 49mm - -
RS Stock No. 499-5592
Mfr. Part No.APR 50 B10
BrandLEM
MYR567.85
Each
units
50:1 18mm - Closed Loop 24 V dc 50A - 69mm -20°C 67mm +60°C 55mm - -
RS Stock No. 751-1623
Mfr. Part No.93485 P1
MYR88.09
Each
units
250:1 - - - - 250A - - -20°C - +70°C - 62 (Dia.) x 20 mm -
RS Stock No. 537-4520
Mfr. Part No.AC-1020
MYR19.02
Each (In a Pack of 5)
units
20:1 - - - - 20A - - -40°C - +120°C - 23.8 x 23.8 x 11.12 mm -
RS Stock No. 666-8182
Mfr. Part No.CASR 6-NP
BrandLEM
MYR68.39
Each
units
6:1 - - Closed Loop 5.25 V 6A - 16.5mm -40°C 21.91mm +85°C 13.4mm - -
RS Stock No. 399-7244
Mfr. Part No.ASM-010
MYR17.21
Each
units
10:1 - - - - 10A - - -40°C - +120°C - 20.4 x 17.2 x 9.53 mm -
RS Stock No. 913-9731
Mfr. Part No.METSECT5CC005
MYR273.51
Each
units
50:5 21mm Toroidal Ring - - - - - -25°C - +60°C - 65 x 44 x 30 mm -
RS Stock No. 331-604
Mfr. Part No.CTSCM40400/5-5/1
BrandHOBUT
MYR255.00
Each
units
400:5 - Clip Fit - - 400A 5 A 116mm -30°C 104.5mm +80°C 35.5mm - -
RS Stock No. 497-271
Mfr. Part No.HTR 200-SB
BrandLEM
MYR711.13
Each
units
400:1 21mm - Open Loop 12 → 15 V 400A - 69mm -10°C 46mm +70°C 21.5mm - -
RS Stock No. 331-597
Mfr. Part No.CT132M40/5-1/3
BrandHOBUT
MYR76.85
Each
units
40:5 21mm DIN Rail Mounted - - 40A 5 A 65mm -30°C 45mm +85°C 30mm - -
RS Stock No. 832-9841
Mfr. Part No.L01-8508
BrandAlttec
MYR91.77
Each
units
150:5 28mm Clip Fit - - - - 78.5mm - 61mm +40°C 40mm 78.5 x 61 x 72 mm -
RS Stock No. 914-5284
Mfr. Part No.CT132TRAN50A-4/20MA
BrandHOBUT
MYR223.20
Each
units
50:1 21mm - - 15 → 30 V 50A 4 → 20 mA 65mm -15°C 45mm +50°C 30mm - -
RS Stock No. 180-7391
Mfr. Part No.LA 55P/SP1
BrandLEM
MYR103.76
Each
units
100:1 12.7 x 7mm - Closed Loop 12 → 15 V 100A 25 mArms 27.6mm -40°C 36.5mm +85°C 14.45mm - -