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SFF Static Digital Frequency Relay - Legacy

SFF Static Digital Frequency Relay

Manufacturing for this product has been discontinued. As an alternative, please refer to the 3 Series relays.

Type SFF relays are digital frequency relays designed to operate when the system frequency changes to a predetermined level. They may be set for over-, under-, or restore- frequency operation. Versions are available with one, two, or four frequency points independently settable for function, frequency value, and output delay.

Features and Benefits
  • Easy setpoint setup
  • AC or DC control power
  • Drawout case

  • Applications
  • Load shedding frequency schemes

  • Protection and Control
  • Under and overfrequency with undervoltage cutoff
  •