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. 106-8529
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.54100C
THB52.313
Each (On a Reel of 450)
Units
15:1 - - - - 15A - - -40°C - +125°C - 10.8 x 9 x 8.2 mm -
RS Stock No. 435-8628
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.HX 03-P
Brand :LEM
THB403.48
Each
Units
9:1 0.6mm - Open Loop ±15 V 9A - 20mm -25°C 19mm +85°C 15.4mm - -
RS Stock No. 173-0059
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AP-2000
THB141.663
Each (In a Box of 250)
Units
15:1 - - - - 15A - - -40°C - +85°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 775-4956
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AP-2000
THB157.53
Each
Units
15:1 - - - - 15A - - -40°C - +85°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 914-5290
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.CTSCMWH30/0.333V
Brand :HOBUT
THB881.27
Each
Units
- 10mm Split Core - - 30A 333 mV - -15°C - +50°C - 28.7 x 26.4 x 41.7 mm Multi Function Meter
RS Stock No. 477-4711
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.CSNS300M
Brand :Honeywell
THB6,783.59
Each
Units
600:1 26mm - Closed Loop 15 V 600A 150 mA 61.2mm -40°C 67.5mm +85°C 19mm - -
RS Stock No. 257-830
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.CT173M400/5-2.5/1-002
Brand :HOBUT
THB639.19
Each
Units
400:5 40mm Base Mounted - - 400A 5 A 95mm -30°C 70mm +85°C 55mm - -
RS Stock No. 189-5477
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.CSNE151
Brand :Honeywell
THB1,445.13
Each
Units
36:1 - - Closed Loop 15 V 36A 25 mA 28mm 0°C 28mm +70°C 16.8mm - -
RS Stock No. 392-8311
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.ASK 412.4 100/5 A
THB1,155.90
Each
Units
100:5 30.5mm Base Mounted - - - - 88.5mm -5°C 70mm +40°C 58mm - -
RS Stock No. 537-4491
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AC-1010
THB137.362
Each: (In a Pack of 5)
Units
10:1 - - - - 10A - - -40°C - +120°C - 23.8 x 23.8 x 11.12 mm -
RS Stock No. 775-4928
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AX-1000
THB136.25
Each
Units
10:1 - - - - 10A - - -40°C - +120°C - 12.7 x 17 x 9.53 mm -
RS Stock No. 287-3169
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.CT151M80/5-2.5/1
Brand :HOBUT
THB579.12
Each
Units
80:5 14mm Straight Through - - - - 75mm -20°C 54.5mm +70°C 68mm - -
RS Stock No. 446-0614
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.DK 100 B420
Brand :LEM
THB17,843.11
Each
Units
100:1 21.7mm - Open Loop 20 → 50 V dc 100A 4 → 20 mA 68.6mm -20°C 89.7mm +50°C 30.2mm - -
RS Stock No. 435-8690
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.HX 05-P/SP2
Brand :LEM
THB459.25
Each
Units
15:1 0.8mm - Open Loop 12 → 15 V 15A - 20.5mm -25°C 19mm +85°C 15.4mm - -
RS Stock No. 287-3125
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.CT151M25/5-2.5/3
Brand :HOBUT
THB630.09
Each
Units
25:5 14mm Straight Through - - - - 75mm -20°C 54.5mm +70°C 68mm - -
RS Stock No. 313-801
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.CT174M500/5-2.5/1-001
Brand :HOBUT
THB694.41
Each
Units
500:5 40mm Base Mounted - - 500A 5 A 95mm -30°C 70mm +85°C 55mm - -
RS Stock No. 527-8545
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.DHR 300 C10
Brand :LEM
THB9,482.47
Each
Units
300:1 32mm - Open Loop 20 → 50 V dc 300A - 70mm -40°C 90mm +70°C 25mm - -
RS Stock No. 436-2330
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LTS 6NP
Brand :LEM
THB784.70
Each
Units
19.2:1 3.2mm - Closed Loop 5 V 19.2A - 24mm -40°C 22.2mm +85°C 10mm - -
RS Stock No. 793-4610
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.DVL 250
Brand :LEM
THB8,666.66
Each
Units
- - - - ±15 → 24 V - 50 mA 48.3mm -40°C 63mm +85°C 100mm - -
RS Stock No. 497-164
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.CT 0.4P
Brand :LEM
THB3,174.21
Each
Units
800:1 11mm - - 15 V 800A - 30mm -20°C 30mm +85°C 20mm - -