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 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 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 914-5301
製造零件編號CTSCMWH500/0.333V
BrandHOBUT
HK$377.62
單位
- 35mm Split Core - - 500A 333 mV - -15°C - +50°C - 51.2 x 51.2 x 83.5 mm Multi Function Meter
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 913-9731
製造零件編號METSECT5CC005
HK$472.48
單位
50:5 21mm Toroidal Ring - - - - - -25°C - +60°C - 65 x 44 x 30 mm -
RS庫存編號 173-0058
製造零件編號AP-1500
HK$34.359
個 (以毎盒:250)
單位
10:1 - - - - 10A - - -40°C - +85°C - 17.2 x 9.53 x 20.4 mm -
RS庫存編號 451-1403
製造零件編號LF 2005S
BrandLEM
HK$3,411.01
單位
2000:1 60.5mm - Closed Loop 15 → 24 V 2000A 400 mArms 68.5mm -40°C 170mm +85°C 52mm - -
RS庫存編號 169-7652
製造零件編號CSLA1CF
BrandHoneywell
HK$220.847
個 (以毎盒:50)
單位
100:1 10.9mm - Open Loop 8 → 16 V dc 100A - 35.6mm -25°C 34.3mm +85°C 10.4mm - -
RS庫存編號 331-604
製造零件編號CTSCM40400/5-5/1
BrandHOBUT
HK$446.46
單位
400:5 - Clip Fit - - 400A 5 A 116mm -30°C 104.5mm +80°C 35.5mm - -
RS庫存編號 181-2129
製造零件編號CSLA2CD
BrandHoneywell
HK$202.71
單位
- 10.9mm - Open Loop 6 → 12 V dc - - - - - - - - -
RS庫存編號 436-2330
製造零件編號LTS 6NP
BrandLEM
HK$168.51
單位
19.2:1 3.2mm - Closed Loop 5 V 19.2A - 24mm -40°C 22.2mm +85°C 10mm - -
RS庫存編號 914-5294
製造零件編號CTSCMWH60/0.333V
BrandHOBUT
HK$201.35
單位
- 10mm Split Core - - 60A 333 mV - -15°C - +50°C - 28.7 x 26.4 x 41.7 mm Multi Function Meter
RS庫存編號 533-0643
製造零件編號CTSCM40-200/5
BrandHOBUT
HK$452.08
單位
200:5 - Clip Fit - - - - 104.5mm -30°C 116mm +80°C 35.5mm - -
RS庫存編號 521-992
製造零件編號LF 205-S/SP3
BrandLEM
HK$696.84
單位
200:1 15.5mm - Closed Loop 12 → 15 V 200A 100 mArms 51.63mm -40°C 61mm +85°C 26.19mm - -
RS庫存編號 775-4947
製造零件編號AP-1500
HK$38.04
單位
10:1 - - - - 10A - - -40°C - +85°C - 17.2 x 9.53 x 20.4 mm -
RS庫存編號 331-581
製造零件編號CTSCM40300/5-2.5/1
BrandHOBUT
HK$440.49
單位
300:5 - Clip Fit - - 300A 5 A 116mm -30°C 104.5mm +80°C 35.5mm - -
RS庫存編號 650-560
製造零件編號CSLA1CF
BrandHoneywell
HK$308.09
單位
- 10.9mm - Open Loop 8 → 16 V dc - - - - - - - - -
RS庫存編號 775-4915
製造零件編號AX-0500
HK$42.93
單位
5:1 - - - - 5A - - -40°C - +120°C - 12.7 x 17 x 9.53 mm -
RS庫存編號 331-575
製造零件編號CTSCM40500/5-5/1
BrandHOBUT
HK$456.24
單位
500:5 - Clip Fit - - 500A 5 A 116mm -30°C 104.5mm +80°C 35.5mm - -
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 - -