The MIF, a member of the M Family of protection relays, is a microprocessor based relay that provides primary circuit protection on distribution networks at any voltage level and backup/auxiliary protection for transformers, generators and motors. Protection features include three phase time delayed overcur-rent, phase instantaneous overcurrent (two levels Hiset and Loset), ground time delayed overcurrent, ground instantaneous overcurrent (two levels Hiset and Loset) and thermal image protection. Each protection element can be selectively enabled either via the front panel or via communication. Flexible settings, selectable curves plus the choice of a user configurable overcurrent curve enable accurate coordination with other devices.
Feeder protection, any voltage level
3 phase and ground time delayed overcurrent (51/51G)
4 preconfigured overcurrent curves n 1 user configurable overcurrent curve (FlexCurve)
3 phase and ground instantaneous overcurrent (Hiset and Loset) (50-1/50G-1, 50-2/50G-2)