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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รายละเอียดสินค้า / Description ราคา / 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 Stock No. 286-311
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LA 25-NP
Brand :LEM
THB987.26
Each
Units
36:1 - - Closed Loop 15 V 36A 25 mArms 16.45mm -40°C 26mm +85°C 29.2mm - -
RS Stock No. 180-7357
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LA 55-P
Brand :LEM
THB1,031.59
Each
Units
70:1 - - Closed Loop 12 → 15 V 70A 50 mArms 27.6mm -40°C 36.6mm +85°C 14.45mm - -
RS Stock No. 286-361
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LV 25-P
Brand :LEM
THB2,712.41
Each
Units
14:1 - - Closed Loop 12 → 15 V 14A 25 mA 16.45mm 0°C 26mm +70°C 29.2mm - -
RS Stock No. 180-7391
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LA 55P/SP1
Brand :LEM
THB1,097.61
Each
Units
100:1 12.7 x 7mm - Closed Loop 12 → 15 V 100A 25 mArms 27.6mm -40°C 36.5mm +85°C 14.45mm - -
RS Stock No. 179-6667
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LA 100-P
Brand :LEM
THB1,065.59
Each
Units
150:1 12.7 x 7mm - Closed Loop 12 → 15 V 150A 50 mArms 27.6mm -40°C 36.5mm +85°C 14.45mm - -
RS Stock No. 399-7244
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.ASM-010
THB129.45
Each
Units
10:1 - - - - 10A - - -40°C - +120°C - 20.4 x 17.2 x 9.53 mm -
RS Stock No. 446-0579
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AKR 50 B420L
Brand :LEM
THB16,119.68
Each
Units
50:1 21.7mm - - 24 V dc, 150 V ac 50A 4 → 20 mA 57.2mm -20°C 89.7mm +50°C 30mm - -
RS Stock No. 499-5485
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.HTB 100-P
Brand :LEM
THB884.39
Each
Units
300:1 16mm - Open Loop 12 → 15 V 300A - 34mm -20°C 39mm +80°C 14mm - -
RS Stock No. 833-2743
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.DM0T0050
Brand :Lovato
THB686.85
Each
Units
50:5 22mm Base Mounted - - - - 66mm -25°C 44mm +50°C 32mm - -
RS Stock No. 301-9473
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LTS 25NP
Brand :LEM
THB700.49
Each
Units
80:1 3.2mm - Closed Loop 5 V 80A - 24mm -40°C 22.2mm +85°C 10mm - -
RS Stock No. 435-8741
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.HX 05-NP
Brand :LEM
THB455.72
Each
Units
30:1 0.8mm - Open Loop 15 V 30A - 20mm -25°C 19mm +85°C 15.4mm - -
RS Stock No. 537-4485
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AC-1005
THB133.066
Each: (In a Pack of 5)
Units
5:1 - - - - 5A - - -40°C - +120°C - 23.8 x 23.8 x 11.12 mm -
RS Stock No. 451-1324
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LA 100P/SP13
Brand :LEM
THB1,035.05
Each
Units
160:1 12.7 x 7mm - Closed Loop 12 → 15 V 160A 100 mArms 27.6mm -25°C 36.5mm +70°C 14.45mm - -
RS Stock No. 497-209
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AT 50 B420L
Brand :LEM
THB3,779.73
Each
Units
50:1 16mm - - 20 → 30 V dc 50A 4 → 20 mA 67mm -20°C 44.5mm +60°C 36.5mm - -
RS Stock No. 715-7989
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.2308030
THB7,787.93
Each
Units
200:1 32mm - - 20 → 30 V dc 200A 4 → 20 mA 70mm -40°C 90mm +65°C 33.8mm - -
RS Stock No. 198-835
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AT 20 B10
Brand :LEM
THB2,580.74
Each
Units
20:1 16mm - - - 20A - 67mm -20°C 44.5mm +60°C 36.5mm - -
RS Stock No. 510-9152
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.7KT1201
Brand :Siemens
THB3,499.51
Each
Units
- 13mm Straight Through - - - - - - - - - - -
RS Stock No. 775-4909
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AZ-0500
THB176.35
Each
Units
500:1 - - - - 25A - - -40°C - +85°C - 19.0 x 11.5 x 21.5 mm -
RS Stock No. 667-3455
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.CSNE151-100
Brand :Honeywell
THB1,116.54
Each
Units
90:1 - - Closed Loop 12 → 15 V dc 90A 25 mA 20.3mm -40°C 31.75mm +85°C 12.7mm - -
RS Stock No. 331-581
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.CTSCM40300/5-2.5/1
Brand :HOBUT
THB1,784.02
Each
Units
300:5 - Clip Fit - - 300A 5 A 116mm -30°C 104.5mm +80°C 35.5mm - -