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 919-4703
製造零件編號LF 1010-S
BrandLEM
HK$1,288.69
單位
2700:1 - - Closed Loop ±14.25 → ±25.2 V 2700A ±0.54 A 94.8mm -40°C 110mm +85°C 43.9mm - -
RS庫存編號 886-2102
製造零件編號XW01-075081S000000
HK$176.75
單位
15:5 - Base Mounted - - - - - - - - - 62 x 40 x 78 mm -
RS庫存編號 775-4928
製造零件編號AX-1000
HK$32.59
單位
10:1 - - - - 10A - - -40°C - +120°C - 12.7 x 17 x 9.53 mm -
RS庫存編號 173-0057
製造零件編號AX-1000
HK$29.032
個 (以毎盒:250)
單位
10:1 - - - - 10A - - -40°C - +120°C - 12.7 x 17 x 9.53 mm -
RS庫存編號 611-8602
製造零件編號K8ACCT200L
BrandOmron
HK$658.44
毎盒:1 個
Box(es)
- 30mm Toroidal Ring - - - - 81.5mm - 76mm - 20mm - -
RS庫存編號 331-547
製造零件編號CT164M400/5-5/1-001
BrandHOBUT
HK$206.07
單位
400:5 28mm DIN Rail Mounted - - 400A 5 A 78mm -30°C 60mm +85°C 45mm - -
RS庫存編號 435-8634
製造零件編號HX 05-P
BrandLEM
HK$118.59
單位
15:1 0.8mm - Open Loop 15 V 15A - 20mm -25°C 19mm +85°C 15.4mm - -
RS庫存編號 313-801
製造零件編號CT174M500/5-2.5/1-001
BrandHOBUT
HK$166.09
單位
500:5 40mm Base Mounted - - 500A 5 A 95mm -30°C 70mm +85°C 55mm - -
RS庫存編號 532-9126
製造零件編號HXS 50-NP
BrandLEM
HK$127.06
單位
150:1 - - Open Loop 5 V 150A - 10.7mm -40°C 16.7mm +105°C 18.7mm - -
RS庫存編號 527-8595
製造零件編號DHR 1000 C10
BrandLEM
HK$2,036.66
單位
1000:1 32mm - Open Loop 20 → 50 V dc 1000A - 70mm -40°C 90mm +70°C 25mm - -
RS庫存編號 667-3459
製造零件編號CSNE151-104
BrandHoneywell
HK$174.39
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 287-3226
製造零件編號CT153M400/5-2.5/1
BrandHOBUT
HK$147.32
單位
400:5 26mm Straight Through - - - - 75mm -20°C 54.5mm +70°C 68mm - -
RS庫存編號 715-7024
製造零件編號53030C
HK$15.81
單位
10:1 - - - - 10A - - -40°C - +125°C - 8.3 x 7.2 x 5.4 mm -
RS庫存編號 106-8534
製造零件編號56050C
HK$15.364
毎管:25 個
單位
10:1 - - - - 10A - - -40°C - +85°C - 16.79 x 8.89 x 20.19 mm -
RS庫存編號 715-7061
製造零件編號56100C
HK$14.55
單位
10:1 - - - - 10A - - -40°C - +85°C - 16.79 x 8.89 x 20.19 mm -
RS庫存編號 301-9495
製造零件編號HAS 100S
BrandLEM
HK$232.19
單位
300:1 20.4 x 10.4mm - Open Loop 15 V 300A - 30mm -10°C 40mm +80°C 30mm - -
RS庫存編號 331-373
製造零件編號CT164M500/5-5/0.5-001
BrandHOBUT
HK$212.37
單位
500:5 28mm DIN Rail Mounted - - 500A 5 A 78mm -30°C 60mm +85°C 45mm - -
RS庫存編號 522-014
製造零件編號HAT 200-S
BrandLEM
HK$521.66
單位
600:1 40.5 x 30.5mm - Open Loop 15 V 600A - 65mm -10°C 90mm +80°C 37mm - -
RS庫存編號 666-8182
製造零件編號CASR 6-NP
BrandLEM
HK$164.60
單位
6:1 - - Closed Loop 5.25 V 6A - 16.5mm -40°C 21.91mm +85°C 13.4mm - -
RS庫存編號 886-2162
製造零件編號XM19-285111S000000
HK$242.30
單位
300:5 50mm Base Mounted - - - - - - - - - 86 x 45 x 110 mm -