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 913-9734
製造零件編號METSECT5CC013
HK$585.68
單位
125:5 21mm Toroidal Ring - - - - - -25°C - +60°C - 65 x 44 x 30 mm -
RS庫存編號 913-9731
製造零件編號METSECT5CC005
HK$457.25
單位
50:5 21mm Toroidal Ring - - - - - -25°C - +60°C - 65 x 44 x 30 mm -
RS庫存編號 913-9738
製造零件編號METSECT5CC020
HK$492.42
單位
200:5 21mm Toroidal Ring - - - - - -25°C - +60°C - 65 x 44 x 30 mm -
RS庫存編號 198-4489
製造零件編號METSECT5DH125
HK$1,174.44
單位
1250:5 - Tropicalise - - 1250A 5 A 129mm -25°C 98mm +50°C 40mm - -
RS庫存編號 198-4503
製造零件編號METSECT5MC040
HK$767.46
單位
400:5 32mm Tropicalise - - 400A 5 A 95mm -25°C 70mm +60°C 65mm - -
RS庫存編號 198-4505
製造零件編號METSECT5MC060
HK$790.71
單位
600:5 32mm Tropicalise - - 600A 5 A 95mm -25°C 70mm +60°C 65mm - -
RS庫存編號 198-4507
製造零件編號METSECT5MD050
HK$767.46
單位
500:5 40mm Tropicalise - - 500A 5 A 95mm -25°C 70mm +60°C 65mm - -
RS庫存編號 198-4479
製造零件編號METSECT5DC250
HK$1,627.94
單位
2500:5 - Tropicalise - - 2500A 5 A 160mm -25°C 125mm +50°C 87mm - -
RS庫存編號 198-4477
製造零件編號METSECT5DB300
HK$1,558.17
單位
3000:5 - Tropicalise - - 3000A 5 A 160mm -25°C 99mm +60°C 78.4mm - -
RS庫存編號 198-4472
製造零件編號METSECT5DB125
HK$1,267.46
單位
1250:5 - Tropicalise - - 1250A 5 A 160mm -25°C 99mm +60°C 78.4mm - -
RS庫存編號 198-4499
製造零件編號METSECT5MB030
HK$627.92
單位
300:5 26mm Tropicalise - - 300A 5 A 85mm -25°C 60mm +60°C 63mm - -
RS庫存編號 198-4486
製造零件編號METSECT5DE125
HK$1,174.44
單位
1250:5 - Tropicalise - - 1250A 5 A 129mm -25°C 135mm +50°C 85mm - -
RS庫存編號 198-4481
製造零件編號METSECT5DC400
HK$1,832.66
單位
4000:5 - Tropicalise - - 4000A 5 A 160mm -25°C 125mm +50°C 87mm - -
全新
RS庫存編號 211-1869
製造零件編號LUTC2001
HK$647.22
單位
200A - Base Mounted - - 200A 1 A 99mm - 32mm - - - -
RS庫存編號 198-4483
製造零件編號METSECT5DD125
HK$1,081.41
單位
1250:5 - Tropicalise - - 1250A 5 A 116mm -25°C 96mm +50°C 78.4mm - -
RS庫存編號 198-4504
製造零件編號METSECT5MC050
HK$779.08
單位
500:5 32mm Tropicalise - - 500A 5 A 95mm -25°C 70mm +60°C 65mm - -
RS庫存編號 198-4475
製造零件編號METSECT5DB250
HK$1,465.14
單位
2500:5 - Tropicalise - - 2500A 5 A 160mm -25°C 99mm +60°C 78.4mm - -
RS庫存編號 198-4480
製造零件編號METSECT5DC300
HK$1,709.33
單位
3000:5 - Tropicalise - - 3000A 5 A 160mm -25°C 125mm +50°C 87mm - -
RS庫存編號 198-4474
製造零件編號METSECT5DB200
HK$1,395.37
單位
2000:5 - Tropicalise - - 2000A 5 A 160mm -25°C 99mm +60°C 78.4mm - -
RS庫存編號 198-4490
製造零件編號METSECT5DH150
HK$1,255.84
單位
1500:5 - Tropicalise - - 1500A 5 A 129mm -25°C 98mm +50°C 40mm - -