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


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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庫存編號 522-008
製造零件編號HAT 600-S
BrandLEM
HK$550.49
單位
1800:1 40.5 x 30.5mm - Open Loop 15 V 1800A - 65mm -10°C 90mm +80°C 37mm - -
RS庫存編號 810-0912
製造零件編號20310200102
BrandHARTING
HK$546.82
單位
200:1 - - - 12 → 15 V dc 200A 100 mA 56.3mm -40°C 66mm +85°C 56.5mm - -
RS庫存編號 418-3604
製造零件編號CTSCEN100<400/5
BrandHOBUT
HK$747.36
單位
100:5, 200:5, 300:5, 400:5 - Clip Fit - - - - 113mm -30°C 127mm +80°C 40mm - -
RS庫存編號 497-211
製造零件編號LTSP 25-NP
BrandLEM
HK$203.95
單位
25:1 - - Closed Loop 4.75 → 5.25 V 25A 12 mA 24mm -40°C 22.2mm +85°C 10mm - -
RS庫存編號 881-7900
製造零件編號2CSG225745R1101 CT PRO XT 40
BrandABB
HK$161.53
單位
- 18mm - - - - - - -5°C - +50°C - 45 x 96 x 69 mm -
RS庫存編號 169-7656
製造零件編號CSLA2DK
BrandHoneywell
HK$330.099
個 (以毎盒:50)
單位
- - - - 6 → 12 V dc - Maximum of 400 A 44.5mm -25°C 35.6mm +85°C 14.2mm - -
RS庫存編號 321-6315
製造零件編號LTS 15NP
BrandLEM
HK$155.98
單位
48:1 3.2mm - Closed Loop 5 V 48A - 24mm -40°C 22.2mm +85°C 10mm - -
RS庫存編號 751-1636
製造零件編號93487 P1
HK$172.64
單位
400:1 - - - - 400A - - -20°C - +70°C - 80 (Dia.) x 20 mm -
RS庫存編號 881-7932
製造零件編號2CSG225845R1101 CT PRO XT 40 SELV
BrandABB
HK$194.16
單位
- 18mm - - - - - - -5°C - +50°C - 45 x 96 x 69 mm -
RS庫存編號 782-6809
製造零件編號8-1611461-1
HK$209.95
單位
- - - - - - - - - - - - 6.67 x 5.54 x 6.65 mm -
RS庫存編號 451-1380
製造零件編號LF 505S
BrandLEM
HK$1,134.25
單位
800:1 30.2mm - Closed Loop 15 → 24 V 800A 100 mArms 70.3mm -40°C 80mm +70°C 40mm - -
RS庫存編號 793-4590
製造零件編號HLSR 40-P
BrandLEM
HK$63.57
單位
100:1 - - Open Loop 4.5 → 5.5 V 100A 40 A 12mm -40°C 17.2mm +105°C 21mm - -
RS庫存編號 121-8179
製造零件編號CSLA2DK
BrandHoneywell
HK$431.99
單位
20:1 - - - 6 → 12 V dc 20A Maximum of 400 A 44.5mm -25°C 35.6mm +85°C 14.2mm - -
RS庫存編號 819-9798
製造零件編號140AS
BrandEfergy
HK$141.98
單位
- 19mm - - - - - - - - - - - Oscilloscopes
RS庫存編號 451-1346
製造零件編號LF 205P
BrandLEM
HK$666.68
單位
420:1 15.5mm - Closed Loop 12 → 15 V 420A 100 mArms 45mm -40°C 48mm +85°C 19.5mm - -
RS庫存編號 919-4696
製造零件編號LF 210-S
BrandLEM
HK$428.78
單位
420:1 - - Closed Loop ±11.4 → ±15.75 V 420A ±0.21 A 50.75mm -40°C 61mm +85°C 24.2mm - -
RS庫存編號 793-4587
製造零件編號HLSR 20-P
BrandLEM
HK$112.11
單位
50:1 - - Open Loop 4.5 → 5.5 V 50A 20 A 12mm -40°C 17.2mm +105°C 21mm - -
RS庫存編號 451-1396
製造零件編號LF 1005S
BrandLEM
HK$1,519.69
單位
1500:1 40.5mm - Closed Loop 15 → 24 V 1500A 200 mArms 95mm -40°C 110mm +85°C 34.3mm - -
RS庫存編號 790-1216
製造零件編號ACF-3000AK
BrandAmprobe
HK$2,604.67
單位
30:1 14.3mm - - 3 V 30A - - -20°C - +85°C - - -
RS庫存編號 497-221
製造零件編號LA 25-P
BrandLEM
HK$651.27
單位
55:1 - - Closed Loop 12 → 15 V 55A 25 mArms 27.2mm -25°C 36.5mm +85°C 14.45mm - -