iNTRODUCTION – MEC-100 SERIES The Marelli Motori Digital Regulation Systems included in MEC-100 series are microprocessor-based electronic devices for the set-up and monitoring of the excitation system of Marelli generators with frame size ranging between 400 and 800. The configurability of the system and control parameters makes the MEC-100 series regulators flexible and suitable for a wide range of applications. These regulators are completely resin-bonded and isolated to keep a high operating reliability even in difficult working conditions (high levels of humidity, dust, salty atmosphere) and in presence of vibrations.