The NKR 5 mains monitoring relay is used to monitor the phase voltages of one- up to three-phase networks. When used in a three-phase network, the phase position can also be monitored.

The switching threshold can be set freely from 150 to 230 V or to a defined fixed value of 196 V (DIN VDE 0107 or DIN VDE 0108).

The phase voltages and the direction of the rotating field are displayed on the NKR 5 via LEDs. A phase failure is optically stored by a flashing LED, so that the phase causing the fault can be determined even after a power recovery.

The relay switches on either automatically after power returns or only after acknowledgement (restart interlock). The error case can be simulated via the internal or an external push-button and the circuit can thus be tested.

 

Public buildings, rooms with public traffic, med. used rooms etc..