- 11-pin plug-in.
- Fail-to-safe design.
- Selectable: Over-frequency, Under-frequency or Frequency Window Monitoring
- Start-up delay: 0 sec or 10 sec (selectable)
- Separately adjustable setpoints: over-frequency, (52 to 58 Hz), Under-voltage (42 to 48Hz).
- 60Hz & 400Hz nominal frequency versions available on request.
- Fixed hysteresis: 0.5Hz
- LED indication of Power ON, Relay ON, over frequency & under frequency.
- 10A SPDT relay output.
- Requires optional S3-B 11-pin base.