Fault Annunciator System IL 5990 For monitoring of industrial plants and buildings. Features . According to DIN 19235 . Common alarm annunciator . Expandable from 4 up to 160 inputs . Open circuit inputs / closed circuit inputs  selectable via bridges X1-X2 . Delayed inputs up to 10 s . Acknowledgement push button QH for external buzzer built in . Accessories: Buzzer IK 8832, SK 8832 . Devices available in 2 enclosure versions: I-model: depth 61 mm, with terminals at the bottom for installations systems and industrial distribution systems according to DIN 43 880 S-model: depth 100 mm, with terminals at the top for cabinets with mounting plate and cable duct . Width 35 mm . Fault annunciator IL 5990, SL 5990: 4 inputs with LED on control unit 1 output for common signal and 1 output for audible alarm Technical specifications Width: 35mm Operate delay: Yes Enclosure design: Distribution board Optical signal: LED Alarm inputs: 4 Alarm inputs extendable up to: 160 Operating principle: Energized on trip, De-energized on trip Optional buzzer: Yes Type: IL 5990 Manufacturer: E. Dold & Söhne GmbH & Co. KG Type: IL5990 AC50/60HZ 230V 1S Art. No.: 0049188