ATO/SP3 IoT Series

Split-core current transformer with high accuracy and low phase shift

    ATO/SP3 IoT Series

    ATO/SP3 IoT Series

    Please find here the product page


    Main characteristics:

    • Measurement of AC primary currents from 0 to 10A
    • Voltage output (ratio 225mV @ IPr)
    • Class accuracy 1 (voltage output) according to IEC 61869 standard
    • Compact
    • Self-powered
    • 10 mm diameter aperture
    • Frequency: 50/60 Hz


    • Split-core type
    • Easy mounting
    • Cable output: 1m
    • Operating range: -10°C to +55°C
    • Dimensions (ATO): 45.5 x 33.5 x 32 mm with a 10 mm sensing aperture
    • Rated insulation voltage 600V CATIII PD2, basic insulation

    Standard compliance:

    • The products are CE certified EMC 2014/30/EU regarding their safety according to the European directive 2014/35/EU and tested according to the standards IEC 61010-1.
    • UL 508 (UR marking)
    • IEC 61869 for Instrument transformers performances


    • Fast clip-on mounting whilst cable is connected
    • Principal applications are in the field of energy consumption sub-metering and analysis, branch current monitoring, defective equipment detection and power quality control
    • Slot expected to fix the ATO on conductor with a cable tie
    • DIN rail adaptor (optional)
    • Bosch XDK110 compatible (not supplied)

    Download Technical Articles: IoT remote energy monitoring using LEM Split-Core CT (ATO) following the IEC 61869-2 Smart Grid standard
    Download Technical Articles: Smart Building energy disaggregation Submeter with LEM Split-core CT ATO