MRDT4 transformer phase and earth fault differential relay is designed to protect two winding transformers in distribution, substation and generation systems. The relay can also be used as a generator and power step up transformer differential protection and also incorporates many backup protection functions.

ANSI : 50, 51, 50N, 51N, 46, 49T, 60FL, 86, 50BF, 74TC , 60L, 64RE F, 87G, 87T