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Frequency Monitors
Rhomberg frequency monitors, are used to monitor AC power supply frequency (usually 50Hz on generator sets), and switch a relay contact at a pre-determined level, primarily used for overfrequency and/or underfrequency protection. (Available in 11-pin plug-in only)

SP320 Frequency Monitoring Relay
Protection against over frequency or under frequency of power supply, eg generator sets

  • 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.
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