The 704 is an Automatic Mains Failure module with generator monitoring, protection and start facilities. It utilises advanced surface mount construction techniques to provide a compact yet highly specified module. Operation of the module is via three pushbuttons mounted on the front panel with STOP, MANUAL and AUTO positions. Selection of the ‘ Auto’ mode is confirmed by LED indicator, and monitors the incoming mains supply ( 3 phase or single phase) . Should the incoming AC mains supply fall below a configurable pre-set limit ( 180V default) , the generator will be started, and load transferred to the gen-set.