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 919-4700
製造零件編號LF 510-S
BrandLEM
HK$623.57
單位
800:1 - - Closed Loop ±14.25 → ±25.2 V 800A ±0.16 A 70mm -40°C 89mm +85°C 40.6mm - -
RS庫存編號 668-4067
製造零件編號CT105F250/5-2.5/1
BrandHOBUT
HK$409.12
單位
250:5 21mm Base Mounted - - - - 79mm -30°C 105mm +80°C 53mm - -
RS庫存編號 331-339
製造零件編號CT132M100/5-2.5/1
BrandHOBUT
HK$138.47
單位
100:5 21mm DIN Rail Mounted - - 100A 5 A 65mm -30°C 45mm +85°C 30mm - -
RS庫存編號 286-361
製造零件編號LV 25-P
BrandLEM
HK$656.34
單位
14:1 - - Closed Loop 12 → 15 V 14A 25 mA 16.45mm 0°C 26mm +70°C 29.2mm - -
RS庫存編號 913-9734
製造零件編號METSECT5CC013
HK$611.64
單位
125:5 21mm Toroidal Ring - - - - - -25°C - +60°C - 65 x 44 x 30 mm -
RS庫存編號 537-4485
製造零件編號AC-1005
HK$32.856
/個 (每包:5個)
單位
5:1 - - - - 5A - - -40°C - +120°C - 23.8 x 23.8 x 11.12 mm -
RS庫存編號 499-5378
製造零件編號LTSR 25-NP
BrandLEM
HK$179.42
單位
80:1 3.2mm - Closed Loop 5 V 80A - 24mm -40°C 22.2mm +85°C 10mm - -
RS庫存編號 533-0621
製造零件編號CTSCEN200<1000/5
BrandHOBUT
HK$770.98
單位
200:5, 400:5, 600:5, 800:5, 1000:5 - Clip Fit - - - - 125mm -30°C 132mm +80°C 38mm - -
RS庫存編號 819-9779
製造零件編號90AS
BrandEfergy
HK$111.94
單位
- 12mm Split Core - - - - - - - - - - Data Loggers/DAS, Digital or Analog Meters, DMMs, Recorders
RS庫存編號 775-4934
製造零件編號ACX-1050
HK$44.41
單位
50:1 - - - - 50A - - -40°C - +85°C - 23.8 x 23.8 x 11.12 mm -
RS庫存編號 793-4613
製造零件編號DVL 1000
BrandLEM
HK$1,958.11
單位
- - - - ±15 → 24 V - 50 mA 48.3mm -40°C 63mm +85°C 100mm - -
RS庫存編號 173-0064
製造零件編號ACX-1050
HK$38.62
個 (以毎盒:240)
單位
50:1 - - - - 50A - - -40°C - +85°C - 23.8 x 23.8 x 11.12 mm -
RS庫存編號 532-9211
製造零件編號HTFS 200-P/SP2
BrandLEM
HK$222.64
單位
300:1 22mm - Open Loop 5 V 300A - 46.3mm -40°C 40mm +105°C 17mm - -
RS庫存編號 435-8735
製造零件編號HX 20-P/SP2
BrandLEM
HK$105.76
單位
60:1 1.6mm - Open Loop 12 → 15 V 60A - 20.5mm -25°C 19mm +85°C 15.4mm - -
RS庫存編號 331-519
製造零件編號CT143M100/5-2.5/1-001
BrandHOBUT
HK$146.35
單位
100:5 24mm DIN Rail Mounted - - 100A 5 A 70mm -30°C 49mm +85°C 45mm - -
RS庫存編號 446-0614
製造零件編號DK 100 B420
BrandLEM
HK$4,333.57
單位
100:1 21.7mm - Open Loop 20 → 50 V dc 100A 4 → 20 mA 68.6mm -20°C 89.7mm +50°C 30.2mm - -
RS庫存編號 180-7357
製造零件編號LA 55-P
BrandLEM
HK$239.96
單位
70:1 - - Closed Loop 12 → 15 V 70A 50 mArms 27.6mm -40°C 36.6mm +85°C 14.45mm - -
RS庫存編號 302-6077
製造零件編號2814359
HK$2,530.94
單位
5:1 - - - - 5A 0 → 20 mA 99mm -25°C 22.5mm +60°C 114.5mm - -
RS庫存編號 668-4064
製造零件編號CT105F200/5-2.5/1
BrandHOBUT
HK$393.37
單位
200:5 21mm Base Mounted - - - - 79mm -30°C 105mm +80°C 53mm - -
RS庫存編號 451-1368
製造零件編號LF 305S
BrandLEM
HK$575.31
單位
300:1 20.1mm - Closed Loop 12 → 20 V 300A 150 mArms 56.5mm -40°C 60mm +85°C 26.6mm - -