Current Transformers

Current transformers (CT) are devices that are used to transform the current from a high current into a lower current so that the power can then be measured and controlled. The transformers consist of a core, a primary and a secondary winding. 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.


Current transformers can perform circuit control and perform roles for safety protection and current limiting.


Current transformers are found in:


  • Generating stations,

  • Electrical substations

  • Commercial electric power distribution.

Types of Current Transformers


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.


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รายละเอียดสินค้า / Description ราคา / Price Current Ratio Inner Diameter Transformer Type Overall Height Overall Width Overall Depth Input Current Output Current Minimum Temperature Maximum Temperature Dimensions For Use With Mounting Type Series
RS Stock No. 510-9152
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.7KT1201
Brand :Siemens
THB7,400.76
Each
Units
- 13mm Straight Through - - - - - - - - - DIN Rail -
RS Stock No. 123-9539
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.7KT1200
Brand :Siemens
THB8,136.34
Each
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60:5 13mm Straight Through - - - 60A 5 A - - 105 x 71 x 90 mm - Panel Mount 7KT12
RS Stock No. 123-9540
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.7KT1202
Brand :Siemens
THB7,452.95
Each
Units
150:5 13mm Straight Through - - - 150A 5 A - - 105 x 71 x 90 mm - Panel Mount 7KT12
RS Stock No. 772-1212
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.5SV8700-0KK
Brand :Siemens
THB3,883.96
Each
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- 20mm Toroidal Ring 34mm - - - - -10°C +50°C - - - -
RS Stock No. 772-1221
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.5SV8702-0KK
Brand :Siemens
THB4,667.99
Each
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- 35mm Toroidal Ring 79mm 100mm 58.8mm - - -10°C +50°C - - - -
RS Stock No. 175-6171
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.4NC5225-0DE21
Brand :Siemens
THB2,786.19
Each
Units
400:1 - Window 67.6mm 60.6mm 78.4mm 400A 1 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6145
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.4NC5122-0CE21
Brand :Siemens
THB2,588.19
Each
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200:1 20mm Window 65.6mm 60mm 75.3mm 200A 1 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6130
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.4NC5112-2CB21
Brand :Siemens
THB2,344.56
Each
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50:5 - Window 65.6mm 60mm 75.3mm 50A 5 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6176
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.4NC5231-2FE21
Brand :Siemens
THB2,749.14
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Units
800:5 - Window 62.2mm 59.5mm 75.3mm 800A 5 A -30°C +55°C 59.5 x 75.3 x 62.2 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6172
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.4NC5225-2CE21
Brand :Siemens
THB2,344.56
Each
Units
400:5 - Window 67.6mm 60.6mm 78.4mm 400A 5 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 123-9519
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.4NC5223-0CE20
Brand :Siemens
THB2,397.49
Each
Units
250:1 28mm Window - - - 250A 1 A -10°C 55°C 80 x 64 x 85.5 mm Measuring Devices Panel Mount 4NC
RS Stock No. 175-6146
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.4NC5122-0DE21
Brand :Siemens
THB2,749.14
Each
Units
200:1 20mm Window 65.6mm 60mm 75.3mm 200A 1 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6162
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.4NC5223-0CE21
Brand :Siemens
THB2,588.19
Each
Units
250:1 - Window 67.6mm 60.6mm 78.4mm 250A 1 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6178
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.4NC5325-0CE21
Brand :Siemens
THB2,976.46
Each
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400:1 - Window 84.1mm 82.5mm 98mm 400A 1 A -30°C +55°C 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6194
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.4NC5331-2DE21
Brand :Siemens
THB2,748.26
Each
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800:5 - Window 84.1mm 82.5mm 98mm 800A 5 A -30°C +55°C 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6177
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.4NC5232-2FE21
Brand :Siemens
THB2,749.14
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Units
1000:5 30mm Window 62.2mm 59.5mm 75.3mm 1kA 5 A -30°C +55°C 59.5 x 75.3 x 62.2 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6150
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.4NC5123-0CE21
Brand :Siemens
THB2,588.19
Each
Units
250:1 - Window 65.6mm 60mm 75.3mm 250A 1 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6216
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.4NC5440-0CJ21
Brand :Siemens
THB5,833.29
Each
Units
2500:1 - Window 84.1mm 112mm 127.5mm 2.5kA 1 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6127
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.3UL2307-1A
Brand :Siemens
THB19,828.60
Each
Units
- - Toroidal Ring 62mm 300mm 286.2mm 30 mA → 40 A 630 A -25°C +60°C 300 x 286.2 x 62 mm Fault Current Monitoring Chassis Mount -
RS Stock No. 175-6163
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.4NC5223-0DE21
Brand :Siemens
THB2,786.19
Each
Units
250:1 - Window 67.6mm 60.6mm 78.4mm 250A 1 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron