MDF Microprocessor Frequency Relay

The MDF is a digital frequency relay equipped with various combinations of functions.

This relay is intended to sense hazardous under frequency (or over frequency) conditions and initiate selective load shedding to preserve service continuity to other loads.

It is also applied to turbine-generators to trip the machine through external timers (minutes are required) to avoid possible turbine damage.

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    ABB contact for United States of America

    Sales: Pete Kovacic
    Service: Glenn Goldfarb
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