Siemens 3SK11112AB30 SIRIUS Safety Relay. SIRIUS Safety Relay, Basic, Series: Standard Series, 5 mA, 50/60 Hz Frequency, 24 VAC/VDC Coil, 3NO-1NC Contact Form, 5 A at 115/230 VAC, 0.1/5 A at 24/230 VDC Contact, Threaded/Snap-On Mounting, Spring Terminal, IP20 Enclosure, -25 to 60 deg C, 100 mm H x 22.5 mm W x 121.6 mm D Dimensions. Additional Description: SIEM-3SK11112AB30 Safety Relay,3NO,1NC,24V AC/DC,Spring. Catalog Description: SIRIUS safety relay standard series device relay enabling circuits 3 no contacts + relay signaling circuit 1 nc contact us = 24 V AC/DC spring-loaded terminal.