Fault Annunciator System AD 5998 The AD 5998 control unit and the AD 5992 expansion unit form an expandable fault indication system for displaying fault messages. Features . New fault annunciation according to DIN 19235 . Expandable from 3 up to 303 inputs . Width 45 mm Fault annunciator AD 5998: . 3 inputs . Pushbutton connection possible for light signal acknowledgement, horn acknowledgement and lamp test . 1 relay for common alarm and 1 for horn  Extension unit AD 5992: . 6 inputs Technical specifications Width: 45mm Enclosure design: Switch cabinet Alarm inputs: 3 Alarm inputs extendable up to: 303 Operating principle: Energized on trip Optional buzzer: Yes Type: AD 5998 Manufacturer: E. Dold & Söhne GmbH & Co. KG Type: AD5998 AC50/60HZ 24V Art. No.: 0032366