Intercom (1), central and control elements for systems of up to 16 refuge zones. These are audio intercoms with high quality finishes in chrome, brass and nickel, pictograms of call signaling in progress, communication and remote control and voice messages synthesized in Spanish for call in progress, communication and open door. The capacity of the system allows controlling up to 16 refuge zones from 4 power plants. As it is a modular system, Optimus has created specific references for the initial kit (intercom, control unit and control elements) for systems with up to 16 zones, as well as for additional intercoms.