Schneider Electric S48891 Modified Differential Ground Fault Interface Module

Schneider Electric S48891 Modified Differential Ground Fault Interface Module (MDGF) is a ground-fault interface accessory for Schneider Electric MasterPact NT/NW and ComPacT NS630b-NS3200 breakers, enabling the Modified Differential Ground Fault protection scheme. Dimensions are 4.17 in (106.0 mm) wide, 3.54 in (90 mm) high, and 2.28 in (58 mm) deep, with 35 mm DIN rail mounting. It is backward compatible with the newer LV848891SP MDGF module, meaning LV848891SP can replace S48891 in supported installations. Used in large power-distribution setups to provide ground fault sensing for NW/NT MasterPact and NS630b-NS3200 configurations.