Digital Energy > Protection & Control > Voltage and Frequency Relays > SFF Static Digital Frequency Relay | |||||||||||||||
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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. Applications Protection and Control
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