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    Split-core current transformers for measuring AC current

    AT Series – Split Core Current Transformers for Smart Grid & Automation

    The AT Series split‑core current transformers are designed for the electronic measurement of AC current waveforms, providing galvanic isolation between the primary and secondary circuits. Based on air‑core current transformer technology, AT current sensors are well suited for applications requiring reliable and flexible current monitoring in energy, smart grid, and automation systems.

    A key characteristic of the AT Series is its versatility in output configurations. AT current transformers are available with current or voltage outputs, including 4–20 mA, 0–5 V, and 0–10 V, enabling easy integration into a wide range of control and monitoring architectures. They provide an RMS (average‑responding) output, feature a terminal connection, and incorporate a 16 mm aperture, supporting straightforward installation in industrial environments.

    AT – Features & Benefits

    AT smart grid automation current sensors

    Main characteristics

    • RMS output
    • Split‑core current transformer, enabling non‑contact installation
    • Multiple output formats including loop‑powered 4–20 mA and 0–5 V / 0–10 V voltage outputs
    • 16 mm sensing aperture, suitable for common industrial conductors
    • Terminal output
    • Insulating plastic case recognized according to UL 94‑V0

    Benefits

    • High insulation between primary and secondary circuits
    • Compact housing, optimized for space‑constrained panels
    • Cost‑effective solution for AC current monitoring
    • Easy installation

    Typical applications

    The AT Series is primarily intended for energy and automation systems, including:

    • Automation & supervision: Current measurement for process regulation using PLCs or remote control systems (e.g. SCADA)
    • Safety & condition monitoring: Load monitoring for protection systems and predictive maintenance (e.g. conveyors, pumps, HVAC motors)
    • Energy management: Convenient connection to power consumption sub-meters

    The AT Series is well adapted to applications where fixed wiring, panel integration, and centralized control are required.

    LEM AT – Download & Technical Characteristic

    Product

    Check Stock

    		DocumentNominal valueOutputSecondary nominal signal valueOp. Temp
    AT 5 B420LDatasheet
    3D    		5 ACurrent4-20mA-20 to 60°C
    AT 5 B5Datasheet
    3D    		5 AVoltage0-5V-20 to 60°C
    AT 5 B10Datasheet
    3D    		5 AVoltage0-10V-20 to 60°C
    AT 10 B420LDatasheet
    3D    		10 ACurrent4-20mA-20 to 60°C
    AT 10 B5Datasheet
    3D    		10 AVoltage0-5V-20 to 60°C
    AT 10 B10Datasheet
    3D    		10 AVoltage0-10V-20 to 60°C
    AT 20 B420LDatasheet
    3D    		20 ACurrent4-20mA-20 to 60°C
    AT 20 B5Datasheet
    3D    		20 AVoltage0-5V-20 to 60°C
    AT 20 B10Datasheet
    3D    		20 AVoltage0-10V-20 to 60°C
    AT 50 B420LDatasheet
    3D    		50 ACurrent4-20mA-20 to 60°C
    AT 50 B5Datasheet
    3D    		50 AVoltage0-5V-20 to 60°C
    AT 50 B10Datasheet
    3D    		50 AVoltage0-10V-20 to 60°C
    AT 100 B420LDatasheet
    3D    		100 ACurrent4-20mA-20 to 60°C
    AT 100 B5Datasheet
    3D    		100 AVoltage0-5V-20 to 60°C
    AT 100 B10Datasheet
    3D    		100 AVoltage0-10V-20 to 60°C
    AT 150 B420LDatasheet
    3D    		150 ACurrent4-20mA-20 to 60°C
    AT 150 B10Datasheet
    3D    		150 AVoltage0-10V-20 to 60°C

    AT Sensors – ASK FOR SAMPLES / QUOTATIONS

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