Digital ground fault alarm module ANSI 51N/G. The digital ground fault alarm module enables early detection of phase-to-earth fault currents. If a preset value is exceeded, an alarm is generated. This alarm enables maintenance personnel to immediately initiate measures to protect the operating equipment. It is independent of the existing protection functions and can be individually configured. The digital ground fault module is compatible with Micrologic 2,5,6,7.0 X. Note Micrologic X requires firmware version V002.000.xxx or higher. Earlier firmware is not compatible with this application.