Universal Three phase voltage monitoring relay RNPP-302 (hereinafter RNPP-302) is designed for the permanent voltage control and protection of the equipment with rated voltage parameters 220/380 V 50Hz and 230/400V 50Hz:
- over/under voltage, voltage surges and fluctuations,

- phase loss,

- phase combination,

- wrong phase sequence,

- phase imbalance in the AC power circuits.

The RNPP-302 operates with the magnetic coil of the external contactor which in it's turn operates with the power load. The RNPP-302 constantly checks (before and after turning on) the condition of the power contacts of magnetic contactor and detects the stuck together and burned contacts. When the power
parameters return back to normal after the interruption or when the reason of the tripping is eliminated the RNPP-302 performs automatic reclosing and thus restart the equipment. It does so following a time delay (0-600 sec), set previously by the user.

RNPP-302 relay may work in four independent modes:

1. phase loss monitoring mode without voltage level control (parameter tPr = 0);

2. minimum voltage monitoring mode (parameter tPr = 1);

3. maximum voltage monitoring mode (parameter tPr = 2);

4. symmetrical min/max voltage monitoring mode (parameter tPr = 3)

The LED display of the RNPP-302 indicates:

- Acting value of the phase voltage or alternatively line voltage depending on mode of operation;

- Voltage fault in mains power supply and the type of the interruption;

- Status of output relay (OPEN/CLOSED).

For more details please contact us.