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 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 881-7913
製造零件編號2CSG225765R1101 CT PRO XT 60
BrandABB
HK$175.40
單位
- 18mm - - - - - - -5°C - +50°C - 45 x 96 x 69 mm -
RS庫存編號 169-7681
製造零件編號CSNE151-104
BrandHoneywell
HK$127.05
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 181-2135
製造零件編號CSLA2DG
BrandHoneywell
HK$224.18
單位
- 15.7mm - Open Loop 6 → 12 V dc - - - - - - - - -
RS庫存編號 287-3197
製造零件編號CT153M200/5-2.5/1
BrandHOBUT
HK$142.59
單位
200:5 26mm Straight Through - - - - 75mm -20°C 54.5mm +70°C 68mm - -
RS庫存編號 499-5485
製造零件編號HTB 100-P
BrandLEM
HK$181.97
單位
300:1 16mm - Open Loop 12 → 15 V 300A - 34mm -20°C 39mm +80°C 14mm - -
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 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 207-2984
製造零件編號LA 205-S
BrandLEM
HK$892.94
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 793-4584
製造零件編號HLSR 10-P
BrandLEM
HK$106.71
單位
25:1 - - Open Loop 4.5 → 5.5 V 25A 10 A 12mm -40°C 17.2mm +105°C 21mm - -
RS庫存編號 287-3210
製造零件編號CT153M300/5-2.5/1
BrandHOBUT
HK$145.38
單位
300:5 26mm Straight Through - - - - 75mm -20°C 54.5mm +70°C 68mm - -
RS庫存編號 775-2714
製造零件編號CTSCMICRO19-200/5-T-S
BrandHOBUT
HK$464.12
單位
200:5 - Split Core - - - - 78mm -30°C 58mm +55°C 49mm - -
RS庫存編號 477-4711
製造零件編號CSNS300M
BrandHoneywell
HK$1,066.82
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 313-823
製造零件編號CT174M800/5-2.5/1-001
BrandHOBUT
HK$180.03
單位
800:5 40mm Base Mounted - - 800A 5 A 95mm -30°C 70mm +85°C 55mm - -
RS庫存編號 321-6286
製造零件編號LAH25-NP
BrandLEM
HK$215.46
單位
25:1 - - Closed Loop 12 → 15 V 25A 25 mArms 21mm -25°C 33.3mm +85°C 14.93mm - -
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 886-2171
製造零件編號XM19-315131S000000
HK$242.30
單位
400:5 50mm Base Mounted - - - - - - - - - 86 x 45 x 110 mm -
RS庫存編號 497-401
製造零件編號LAX 100-NP
BrandLEM
HK$223.64
單位
160:1 - - Closed Loop 11.4 → 15.75 V 160A 50 mA 32mm -40°C 25.5mm +85°C 16.35mm - -
RS庫存編號 331-553
製造零件編號CT143M200/5-2.5/1-001
BrandHOBUT
HK$165.25
單位
200:5 24mm DIN Rail Mounted - - 200A 5 A 70mm -30°C 49mm +85°C 45mm - -
RS庫存編號 729-5517
製造零件編號AC-1100
HK$58.51
單位
100:1 - - - - 100A - - -40°C - +120°C - 44.5 x 14.3 x 44.5 mm -