Clamp Type Current Sensors

The core is easily divided in a single operation for quick mounting and removal Non-contact current detection sensor

Clamp-type current sensor allows mounting in existing circuits without interrupting power supply.

Clamp Type Current Sensor Series Lineup

  • HA Series (Alternating Current Sensor)

    Operating Principle

    Clamp-type alternating current sensor is a current transformer which can detect alternating current at non-contact. This divided type sensor allows mounting in existing circuits without interrupting the power supply. The rated current range is 5A to 600A, and voltage output types are also part of the lineup in addition to general current output types.
    The core placed around the current bus is provided with a secondary winding (N turn), in which electromagnetic induction caused by AC electricity to be detected (I) induces secondary current (I/N).

    Connecting a load resistor (RL) provides output inproportion to the current to be detected.


    • With small variations in relative error and phase difference, and suitable for power measurement
    • Even with CT secondary side release, safe output protection is built-in.
    • Rated current range from 5A to 600A


    • Energy conservation management systems, power measuring circuits
    • Distribution board branch current detection
    • Current supply checking for devices
  • HB Series (Direct Current Sensor)

    Operating Principle

    This current sensor can detect direct current and alternating current at non-contact using a hall element of a magnetoelectric conversion element. Rated products available for solar cell string monitoring are also part of the lineup. As we can also manufacture customized products that meet customer demand, don’t hesitate to ask us.

    This sensor is an open-loop type which can directly detect a magnetic field generated by input current using hall elements. A magnetic field generated by input current (I) is detected by hall elements placed in gaps around the core placed around the input current line, and is converted to voltage.

    Output from the hall element is small, therefore, it is amplified to a voltage of some volts by an amplifier at a subsequent stage to output.


    • Simple construction, small and reasonably-priced
    • Low current consumption
    • Applicable to various powers
    • Wide detecting range, resistant to overcurrent
    • Easy routing for installation by connector connecting specification


    • Solar cell string monitoring system
    • Power supply equipment, etc.

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Product information reference

Current Sensor User’s Guide

When using our current sensors, please read the following “Handling Precautions,” “Main Characteristics,” and “Product Labeling” and use them within the specified limits.

China RoHS Hazardous Substance Information

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