The NBV relay is last-time buy. Orders may be placed until 30th November 2023 and will be fulfilled based upon availability. As an alternative, please refer to the BA300 for battery monitor application.

The NBVIIA relay is a high speed sensitive three-phase voltage unbalance relay which is capable of detecting a small voltage unbalance in a three-phase system. The NBVIIA when applied as a protective device is normally used in conjunction with a time-delay relay. One NBVIIA relay and one timing relay are required at each terminal.