The Dse556 module is used to monitor a mains supply and automatically start and stop the system’s generating sets (controlled by DSE 550 load sharing controllers) and it indicates the operational status by means of anLCD display, and LEDs on the front panel.

The Model 556 is an Automatic Transfer switch and Mains controller with comprehensive
instrumentation and load control features.

The system is used to ‘manage’ the generator bus, which is fed by DSE 550 load sharing controllers.