GE 850 Instruction Manual page 442

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Figure 4-121: Underfrequency Restoration logic diagram
Upon voltage and frequency recovery (measured frequency above programmed
minimum), and "Close" output relay selected as Self-Reset type, the UF Restore operating
condition and hence the Close output relay will reset automatically after the breaker is
detected closed. If the "Close" output relay is selected as Pulsed type, the output relay will
stay closed, until the programmed Seal-In time expires.
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS