Siemens 3SK1111-1AB30 Sirius Safety Relay 3NO 1NC

Siemens SIRIUS 3SK1111-1AB30 is a safety relay Basic unit in the Standard series, delivering three normally open (NO) contacts and one normally closed (NC) contact controlled by a 24 V AC/DC coil with screw-terminal connections. It is designed for autonomous safety circuits and supports functions such as automatic start, monitored start-up, light barrier monitoring, and protective door monitoring. The unit draws up to 2 W of power and carries UL approval with an IP20-rated enclosure for indoor electrical control panels. The 3SK1111-1AB30 specifies Us = 24 V AC/DC and screw-terminal inputs, making it suitable for multi-contact safety interlock and signaling applications in industrial safety circuits.