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NBV Voltage Unbalance Relay

NBV Voltage Unbalance Relay
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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.

Features and Benefits
  • Drawout case
  • Applications
  • Motor bus
  • Detection of upstream blown fuse
  • Protection and Control
  • 3 phase voltage unbalance