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Current transformer

Current transformers are essential components in electrical power systems, designed to step down high primary currents to manageable secondary levels for measurement, protection, and control applications. These devices operate on electromagnetic induction principles, with primary windings typically consisting of a single busbar or cable pass-thr...

Current transformers are essential components in electrical power systems, designed to step down high primary currents to manageable secondary levels for measurement, protection, and control applications. These devices operate on electromagnetic induction principles, with primary windings typically consisting of a single busbar or cable pass-through, while secondary windings provide standardized outputs such as 1A or 5A. Key technical parameters include rated primary current (from tens to thousands of amps), accuracy class (e.g., 0.2, 0.5, 1, 5P, 10P), rated burden (VA), and insulation voltage. Common construction types include wound, toroidal, and bar-type transformers, with mounting options for DIN rail, panel, or busbar systems. They are also known as CTs, current sensors, or instrument transformers in different regions.

Current transformers are widely deployed in medium and low voltage switchgear, distribution panels, motor control centers, and industrial automation systems. They are critical for energy metering in commercial buildings, factories, and utility substations, enabling accurate billing and load monitoring. In protection schemes, they feed current signals to protective relays for overcurrent, earth fault, and differential protection. They also support power quality analysis, harmonic measurement, and process control in automated production lines. Typical environments include electrical rooms, outdoor substations, and harsh industrial settings where temperature, humidity, and vibration resistance are required.

Our category includes a comprehensive range of current transformers such as split-core CTs for retrofit installations, solid-core CTs for new builds, and Rogowski coils for flexible measurement. Key article codes follow patterns like CT-XXXX-YY, where XXXX indicates primary current rating and YY denotes secondary output (e.g., CT-1000-5A). Subcategories include low voltage CTs (up to 720V), medium voltage CTs (up to 36kV), and specialized models for DC or high-frequency applications. We also stock summation CTs, multi-ratio CTs, and models with integrated burden resistors for direct microcontroller interfacing.

Partnering with Electric Automation Network ensures access to genuine, certified current transformers from leading global manufacturers, with real-time pricing and stock visibility. Our engineering team provides technical support for selection, sizing, and application-specific requirements, including accuracy class optimization and burden calculation. We offer express worldwide shipping with secure packaging to prevent mechanical damage during transit. Documentation includes detailed datasheets, wiring diagrams, and compliance certificates (IEC 61869, IEEE C57.13). Whether you need a single unit for a pilot project or bulk quantities for large-scale infrastructure, we deliver reliability and expertise.

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Manufacturer Code Reference Catalog Number Description Delivery Price

4NC5112-2BC20

4NC5112-2BC20

-

Window-type current transformer, Class 3 50 A/5 A, 2.5 VA

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4NC5431-2CH20

4NC5431-2CH20

-

WINDOW-TYPE CURRENT TRANSFORMER, CLASS 1 1000A/5A, 10VA PRIMARY CURRENT 1000A, 10VA

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4NC5224-0CE20

4NC5224-0CE20

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WINDOW-TYPE CURRENT TRANSFORMER, CLASS 1 300A/1A, 5VA PRIMARY CURRENT 300A, 5VA

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7KT1200

7KT1200

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current transformer AC 3x 60/5 A

Measurement transformer 3 phases, 6 mode, Isec 5 A, 720V AC, 3 x 60A. Cancelations and returns limited. Consult conditions.

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7KT1201

7KT1201

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current transformer AC 3x 100/5 A

Measurement transformer 3 phases, 6 mode, Isec 5 A, 720V AC, 3 x 100A. Cancelations and returns limited. Consult conditions.

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4NC5224-2CE20

4NC5224-2CE20

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WINDOW-TYPE CURRENT TRANSFORMER, CLASS 1 300A/5A, 5VA PRIMARY CURRENT 300A, 5VA

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124027

IZMX-RP16A-200

0004357380

Rating plug, 200A, IZMX16, Iu to 800A

Rating plug, 200A, IZMX16, Iu for 800A

Rating plug, 200A, IZMX16, Iu to 800A

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124043

IZMX-RP16B-800

0004357390

Rating plug, 800A, IZMX16, Iu 1000A-1250A

Rating plug, 800A, IZMX16, Iu 1000A-1250A

Rating plug, 800A, IZMX16, Iu 1000A-1250A

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124042

IZMX-RP16A-800

0004357389

Rating plug, 800A, IZMX16, Iu = 800A

Rating plug, 800A, IZMX16, Iu = 800A

Rating plug, 800A, IZMX16, Iu = 800A

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183990

IZMX-CT16-N-1

Y7-183990

Current transformer N, external, IZMX16

IZMX-CT16-N-1

Eaton Moeller series IZMX/INX - ACB. Eaton Moeller series IZMX/INX - ACB. Current transformer N, external, IZMX16, EMEA

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183991

IZMX-CT40-N-1

Y7-183991

Current transformer N, external, IZMX40

IZMX-CT40-N-1

Eaton Moeller series IZMX/INX - ACB. Eaton Moeller series IZMX/INX - ACB. Current transformer N, external, IZMX40, EMEA

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124408

IZMX-RP40F-2000

-

Rating plug, 2000A, IZMX40

Rating plug, 2000A, IZMX40

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4NC5328-2CE20

4NC5328-2CE20

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Window-type current transformer, Class 1 750 A/5 A, 5 VA

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4NC5222-0CE20

4NC5222-0CE20

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WINDOW-TYPE CURRENT TRANSFORMER, CLASS 1 200A/1A, 5VA PRIMARY CURRENT 200A, 5VA

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4NC5123-0CE20

4NC5123-0CE20

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Window-type current transformer, Class 1 250 A/1 A, 5 VA

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4NC5433-0CH20

4NC5433-0CH20

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WINDOW-TYPE CURRENT TRANSFORMER, CLASS 1 1250A/1A, 10VA PRIMARY CURRENT 1250A, 10VA

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4NC5434-2CH20

4NC5434-2CH20

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WINDOW-TYPE CURRENT TRANSFORMER, CLASS 1 1500A/5A, 10VA PRIMARY CURRENT 1500A, 10VA

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TCD3M40080CMX

TCD3M40080CMX

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Selected parameters PRIMARY CURRENT 300...600A PRIMARY TYPE Triple split core SECONDARY CURRENT For EM271-72D Others PRIMARY CURRENT 400A MAX BUS BAR SIZE 20.5mm Ø

Three-phase split core current transformer, for EM271 analyzer, Ø cable max. 21 mm.

3-phase split-core current sensors set for EM271 and ET272 Energy Meter, Primary Current 400A, Opening Diameter 20.5mm

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CTD4X4005AXXX

CTD4X4005AXXX

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Selected parameters PRIMARY CURRENT 300...600A PRIMARY TYPE Solid-core SECONDARY CURRENT 5A Others PRIMARY CURRENT 400A MAX BUS BAR SIZE 64x20mm MOUTING DIN-rail, Panel, Bus-bar

Current transformer, closed core Ø cable max. 51 mm., Plate max. 64x20 mm.

Solid core Current transformer 400A/5A

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CTD12H15005AXXX

CTD12H15005AXXX

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Selected parameters PRIMARY CURRENT 1200…2500A PRIMARY TYPE Solid-core SECONDARY CURRENT 5A Others PRIMARY CURRENT 1500A MAX BUS BAR SIZE 53x125mm MOUTING DIN-rail, Panel, Bus-bar

Current transformer, closed core, max. plate 53x125 mm. Horizontal mounting

Solid core Current transformer 1500A/5A

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CTD10V32005AXXX

CTD10V32005AXXX

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Selected parameters PRIMARY CURRENT 2500…4000A PRIMARY TYPE Solid-core SECONDARY CURRENT 5A Others PRIMARY CURRENT 3200A MAX BUS BAR SIZE 50x125mm MOUTING DIN-rail, Panel, Bus-bar

Current transformer, closed core, Plate max. 50x125 mm. Vertical mounting

Solid core Current transformer 3200A/5A

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TCD3X630200CMX

TCD3X630200CMX

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Selected parameters PRIMARY CURRENT 600...1200A PRIMARY TYPE Triple solid core SECONDARY CURRENT For EM270-72D Others PRIMARY CURRENT 630A MAX BUS BAR SIZE 31x31mm MOUTING DIN-rail, Panel, Bus-bar

Three-phase current transformer, closed core for EM270 analyzer, Plate max. 31x31 mm.

Triple Solid Core Current Transformer, Primary Current 630A, Cable Length 200cm

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CTD3X1505AXXX

CTD3X1505AXXX

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Selected parameters PRIMARY CURRENT 50…150A PRIMARY TYPE Solid-core SECONDARY CURRENT 5A Others PRIMARY CURRENT 150A MAX BUS BAR SIZE 51x15mm MOUTING DIN-rail, Panel, Bus-bar

Current transformer, closed core Ø cable max. 41 mm., Plate max. 51x15 mm.

Solid core Current transformer 150A/5A

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CTD11V15005AXXX

CTD11V15005AXXX

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Selected parameters PRIMARY CURRENT 1200…2500A PRIMARY TYPE Solid-core SECONDARY CURRENT 5A Others PRIMARY CURRENT 1500A MAX BUS BAR SIZE 35x125mm MOUTING DIN-rail, Panel, Bus-bar

Current transformer, closed core, Plate max. 35x125 mm. Vertical mounting

Solid core Current transformer 1500A/5A

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CTD8V6005AXXX

CTD8V6005AXXX

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Selected parameters PRIMARY CURRENT 300...600A PRIMARY TYPE Solid-core SECONDARY CURRENT 5A Others PRIMARY CURRENT 600A MAX BUS BAR SIZE 30x80mm MOUTING DIN-rail, Panel, Bus-bar

Current transformer, closed core, Plate max. 30x80 mm. Vertical mounting

Solid core Current transformer 600A/5A

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CTD8V7005AXXX

CTD8V7005AXXX

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Selected parameters PRIMARY CURRENT 600...1200A PRIMARY TYPE Solid-core SECONDARY CURRENT 5A Others PRIMARY CURRENT 700A MAX BUS BAR SIZE 30x80mm MOUTING DIN-rail, Panel, Bus-bar

Current transformer, closed core, Plate max. 30x80 mm. Vertical mounting

Solid core Current transformer 700A/5A

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CTD8S4005AXXX

CTD8S4005AXXX

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PRIMARY CURRENT 300...600A PRIMARY TYPE Split-core SECONDARY CURRENT 5A Others PRIMARY CURRENT 400A MAX BUS BAR SIZE 30x80mm MOUTING DIN-rail, Panel, Bus-bar

Current transformer, split core, Plate max. 30 x 80 mm.

Split core Current transformer 400A/5A

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CTD4X5005AXXX

CTD4X5005AXXX

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Selected parameters PRIMARY CURRENT 300...600A PRIMARY TYPE Solid-core SECONDARY CURRENT 5A Others PRIMARY CURRENT 500A MAX BUS BAR SIZE 64x20mm MOUTING DIN-rail, Panel, Bus-bar

Current transformer, closed core Ø cable max. 51 mm., Plate max. 64x20 mm.

Solid core Current transformer 500A/5A

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CTD6S8005AXXX

CTD6S8005AXXX

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Selected parameters PRIMARY CURRENT 600...1200A PRIMARY TYPE Split-core SECONDARY CURRENT 5A Others PRIMARY CURRENT 800A MAX BUS BAR SIZE 50x52mm MOUTING DIN-rail, Panel, Bus-bar

Current transformer, split core, Ø cable max. 50 mm., Plate max. 50x52 mm.

Split core Current transformer 800A/5A

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CTD5S2505AXXX

CTD5S2505AXXX

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Selected parameters PRIMARY CURRENT 150…300A PRIMARY TYPE Split-core SECONDARY CURRENT 5A Others PRIMARY CURRENT 250A MAX BUS BAR SIZE 26x32mm MOUTING DIN-rail, Panel, Bus-bar

Current transformer, split core, Ø cable max. 26 mm., Plate max. 26x32 mm.

Split core Current transformer 250A/5A

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