The Zeta addressable input unit (ZIU) is used to interface any equipment that has a volt free normally open contact to a Eurofyre Analogue Addressable fire alarm control panel. This is an upgraded model that uses rotary switches to set the address, and has built-in loop short circuit isolation.

The unit has internal LED indications for loop isolator active, fault on input and alarm (panel controlled). During the system set-up, the LED can be removed from this box to allow them to be viewed.