Machine Differential Relay DTM7033
Three-phase percentage biased differential relay. 
Provides a solution for the protection of rotating machines against internal faults (longitudinal differential protection). 

Can also be used as a transverse differential protection on machines having two accessible windings in parallel per phase (split windings), ensuring protection against short-circuits between turns on the same winding.

ANSI function code: 87 M 

See the homepage for Static relays for the full brochure.