Split-core AC current transducers

March 2018 Electrical Power & Protection

Swiss manufacturer LEM now provides compact split-core, low-cost AC current transducers to provide a RMS 4-20 mA output from an external 20-30 V power supply (loop powered). Separate units are available with full scale readings of 5, 10, 20, 50, 100 and 150 A.

The transducers can accommodate conductors up to 16 mm in diameter. The 5 A units are particularly useful in providing a 4-20 mA output from existing CTs with a 5 A output. LEM also offer self-powered versions with 0-10 V or 0-5 V output, corresponding to the same primary currents listed above.

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