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The SIPROTEC 7SJ600 is a numerical overcurrent relay which, in addition to its primary use in radial distribution power systems and motor protection, can also be employed as backup for feeder, transformer and generator differential protection. The SIPROTEC 7SJ600 provides definite-time and inverse-time overcurrent protection along with overload and unbalanced load protection for a very comprehensive relay package. In this way, equipment such as motors can be protected against asymmetric and excessive loading. Asymmetric short-circuits whose currents can be smaller than the largest possible load currents or phase interruptions are reliably detected