|Digital Energy > Protection & Control > Voltage and Frequency Relays > SFF Static Digital Frequency Relay|
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.
Easy setpoint setup
AC or DC control power
Load shedding frequency schemes
Under and overfrequency with undervoltage cutoff