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