2P49 Three Phase Voltage Monitoring Relay


The main earth fault protection relays in distributions systems, power stations & large manufacturing / processing plants can fail to detect a high impedance breakdown to earth causing hazard to human life & potential damage to plant & equipment. In these & other situations demanding extra sensitive earth fault protection, the 2P49 relay using solid state techniques, can be applied to detect earth currents down to 0.5% of the CT nominal current.


  • High sensitivity
  • Detects phase angle imbalance
  • Detects negative phase sequence
  • Detects supply undervoltage
  • Unaffected by frequency variations of + 5Hz
  • Adjustable 5-15% out of balance setting
  • Range of detection voltages & frequencies available
  • No auxiliary voltage required
  • Fail safe operation (Contact normally picked up)
  • Filter rejects harmonics & control tones
  • Size 2M28-S draw out case
  • Standard heavy duty contacts
  • Optional mechanical flag indication
  • Optional 2s approx. time delay on drop off function
  • Made in Australia




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