GE Consumer & Industrial offers high speed sensitive three-phase voltage unbalance relay, NBVIIA. They can detect a small voltage unbalance in a three-phase system. They serve as a protective device, when these are used in conjunction with a time-delay relay. These sensitive three-phase voltage unbalance relays are provided with Drawout case. They have wide application in Motor bus. These are also used for the detection of upstream blown fuse.
