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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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