The ABB REF620E F is a feeder protection and control relay. It is part of ABB’s Relion® family and its 620 protection and control product series. Here’s a summary of what I found about it:
Description:
·Designed for protection, control, measurement, and supervision of utility substations and industrial power systems.
·Applicable to radial, looped, and meshed networks with or without distributed power generation.
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