The RNPP-311M voltage monitoring relay is designed for protection of three-phase loads against major types of mains faults, as:
- RMS voltage reaching beyond admissible thresholds;
- phase sequence order violation and phase coincidence;
- violation of the mains voltage phase completeness and symmetry.
The device performs monitoring of the main circuit parameters and de-energizes load when the parameters fall beyond specified boundaries. The front panel LEDs display the following:
- presence of voltage in the mains;
- load status (ON/OFF);
- type of fault.