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 177-5952
製造零件編號CSLA1CD
BrandHoneywell
TWD650.10
Each (In a Tray of 50)
單位
- - - - - - - - - - - - - -
RS庫存編號 650-554
製造零件編號CSLA1CD
BrandHoneywell
TWD907.00
單位
- 10.9mm - Open Loop 8 → 16 V dc - - - - - - - - -
RS庫存編號 181-2129
製造零件編號CSLA2CD
BrandHoneywell
TWD737.00
單位
- 10.9mm - Open Loop 6 → 12 V dc - - - - - - - - -
RS庫存編號 477-4711
製造零件編號CSNS300M
BrandHoneywell
TWD5,416.00
單位
600:1 26mm - Closed Loop 15 V 600A 150 mA 61.2mm -40°C 67.5mm +85°C 19mm - -
RS庫存編號 169-7656
製造零件編號CSLA2DK
BrandHoneywell
TWD1,246.00
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 169-7654
製造零件編號CSLA2EL
BrandHoneywell
TWD1,414.60
個 (以毎盒:50)
單位
- - - - 6 → 12 V dc - Maximum of 550 A 57.4mm -25°C 44.4mm +85°C 15.7mm - -
RS庫存編號 169-7652
製造零件編號CSLA1CF
BrandHoneywell
TWD833.60
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 650-560
製造零件編號CSLA1CF
BrandHoneywell
TWD1,163.00
單位
- 10.9mm - Open Loop 8 → 16 V dc - - - - - - - - -
RS庫存編號 181-2135
製造零件編號CSLA2DG
BrandHoneywell
TWD1,104.00
單位
- 15.7mm - Open Loop 6 → 12 V dc - - - - - - - - -
RS庫存編號 121-8178
製造零件編號CSLA2EL
BrandHoneywell
TWD1,780.00
單位
20:1 - - - 6 → 12 V dc 20A Maximum of 550 A 57.4mm -25°C 44.4mm +85°C 15.7mm - -
RS庫存編號 121-8179
製造零件編號CSLA2DK
BrandHoneywell
TWD1,631.00
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 181-2141
製造零件編號CSNP661
BrandHoneywell
TWD1,164.00
單位
90:1 - - Closed Loop 12 → 15 V dc 90A 50 mA 29.6mm -40°C 36.6mm +85°C 14.45mm - -
RS庫存編號 667-3474
製造零件編號CSNR151
BrandHoneywell
TWD1,933.00
單位
200:1 - - Closed Loop 12 → 15 V dc 200A 62.5 mA 29.6mm -40°C 36.6mm +85°C 14.45mm - -
RS庫存編號 181-1429
製造零件編號CSNT651
BrandHoneywell
TWD1,429.00
單位
150:1 12.5 x 9mm - Closed Loop 12 → 15 V dc 150A 25 mA 29.6mm -40°C 36.6mm +85°C 14.45mm - -
RS庫存編號 189-5477
製造零件編號CSNE151
BrandHoneywell
TWD1,214.00
單位
36:1 - - Closed Loop 15 V 36A 25 mA 28mm 0°C 28mm +70°C 16.8mm - -
RS庫存編號 169-7681
製造零件編號CSNE151-104
BrandHoneywell
TWD479.60
個 (以毎盒:40)
單位
56:1 - - Closed Loop 15 V dc 56A 12.5 mA 20.3mm -40°C 31.75mm +75°C 12.7mm - -
RS庫存編號 667-3455
製造零件編號CSNE151-100
BrandHoneywell
TWD1,572.00
單位
90:1 - - Closed Loop 12 → 15 V dc 90A 25 mA 20.3mm -40°C 31.75mm +85°C 12.7mm - -
RS庫存編號 667-3459
製造零件編號CSNE151-104
BrandHoneywell
TWD658.00
單位
56:1 - - Closed Loop 15 V dc 56A 12.5 mA 20.3mm -40°C 31.75mm +75°C 12.7mm - -
RS庫存編號 169-7653
製造零件編號CSNA111
BrandHoneywell
TWD1,123.30
個 (以毎盒:30)
單位
60 mA - - Closed Loop ±15 V 60mA -70 → +70 A 25.7mm 0°C 40.5mm +70°C 18mm - -
RS庫存編號 477-4749
製造零件編號CSNS300F
BrandHoneywell
TWD4,102.00
單位
600:1 26mm - Closed Loop 15 V 600A 150 mA 61.2mm -40°C 67.5mm +85°C 17.9mm - -