This module controls up to three power sources: mains and two generators. It is also possible to configure it to control mains and one generator or just two generators. It features isolated measurement of the voltages and frequency on all three sources as well as the current on the load side. It has four operating modes selectable by the user: OFF, AUTO, MAINS, G1 or G2. Front panel leds signal the installation status in addition to the faults. The user interface consists of a 16-character alphanumeric lcd displays. Three front panel push buttons are provided to select the operating mode and to access a menu of parameters. The menu gives access to all timers, set points and other parameters relevant to the control and protection of the installation.