The synchronizer box, Model MSB25, is a stand alone assembly designed to allow synchronous power transfer between two MMG25 generators, or between a single MMG25 generator and utility power, without disrupting and loads connected to the generator. This will allow the removal of the primary generator from the grid for service or extended maintenance. The MSB25 is capable of handling current up to 100 amperes of 120/208VAC, 60 Hz, 3-phase power. It has two 5-wire grounded input connections and a single 5-wire grounded output connection. This is a special usage item managed by the Project Officer for Mobile Electric Power at PM EPS MARCORSYSCOM. Units desiring to use this item should contact PM EPS, MARCORSYSCOM.