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 729-5517
製造零件編號AC-1100
HK$58.88
單位
100:1 - - - - 100A - - -40°C - +120°C - 44.5 x 14.3 x 44.5 mm -
RS庫存編號 668-4051
製造零件編號CT105F100/5-2.5/1
BrandHOBUT
HK$383.23
單位
100:5 21mm Base Mounted - - - - 79mm -30°C 105mm +80°C 53mm - -
RS庫存編號 667-3437
製造零件編號CSDA1DA
BrandHoneywell
HK$271.80
單位
1:1 10.9mm - Open Loop 6 → 16 V dc 1A 20 mA 19mm -25°C 31.8mm +85°C 25.4mm - -
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 913-9738
製造零件編號METSECT5CC020
HK$512.03
單位
200:5 21mm Toroidal Ring - - - - - -25°C - +60°C - 65 x 44 x 30 mm -
RS庫存編號 510-9152
製造零件編號7KT1201
BrandSiemens
HK$883.07
單位
- 13mm Straight Through - - - - - - - - - - -
RS庫存編號 864-0889
製造零件編號CTSR_1-P
BrandLEM
HK$355.94
單位
1.7:1 20.1mm - Closed Loop 7 V 1.7A - 44.6mm -40°C 41.35mm +105°C 17.9mm - -
RS庫存編號 173-0057
製造零件編號AX-1000
HK$29.215
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 650-554
製造零件編號CSLA1CD
BrandHoneywell
HK$240.17
單位
- 10.9mm - Open Loop 8 → 16 V dc - - - - - - - - -
RS庫存編號 499-5485
製造零件編號HTB 100-P
BrandLEM
HK$183.53
單位
300:1 16mm - Open Loop 12 → 15 V 300A - 34mm -20°C 39mm +80°C 14mm - -
RS庫存編號 106-8529
製造零件編號54100C
HK$12.936
個 (在毎卷:450)
單位
15:1 - - - - 15A - - -40°C - +125°C - 10.8 x 9 x 8.2 mm -
RS庫存編號 886-2134
製造零件編號XM02-285081S000000
HK$120.45
單位
300:5 21mm Base Mounted - - - - - - - - - 45 x 40 x 65 mm -
RS庫存編號 173-0061
製造零件編號AC-1100
HK$53.068
個 (以毎盒:27)
單位
100:1 - - - - 100A - - -40°C - +120°C - 44.5 x 14.3 x 44.5 mm -
RS庫存編號 287-3210
製造零件編號CT153M300/5-2.5/1
BrandHOBUT
HK$146.29
單位
300:5 26mm Straight Through - - - - 75mm -20°C 54.5mm +70°C 68mm - -
RS庫存編號 177-5952
製造零件編號CSLA1CD
BrandHoneywell
HK$172.242
Each (In a Tray of 50)
單位
- - - - - - - - - - - - - -
RS庫存編號 532-9198
製造零件編號HAIS 50-P
BrandLEM
HK$213.80
單位
150:1 15 x 8mm - Open Loop 5 V 150A - 29.5mm -40°C 33mm +85°C 14mm - -
RS庫存編號 207-2984
製造零件編號LA 205-S
BrandLEM
HK$900.50
單位
300:1 22.7 x 17.4mm - Closed Loop 12 → 15 V 300A 100 mArms 56.3mm -10°C 66mm +85°C 56.5mm - -
RS庫存編號 715-7068
製造零件編號56050C
HK$15.76
單位
10:1 - - - - 10A - - -40°C - +85°C - 16.79 x 8.89 x 20.19 mm -
RS庫存編號 301-9473
製造零件編號LTS 25NP
BrandLEM
HK$182.96
單位
80:1 3.2mm - Closed Loop 5 V 80A - 24mm -40°C 22.2mm +85°C 10mm - -
RS庫存編號 170-9247
製造零件編號53030C
HK$7.739
個 (在毎卷:1000)
單位
10:1 - - - - 10A - - -40°C - +125°C - 8.3 x 7.2 x 5.4 mm -