Siemens AG Safety Relays 3SK12112BB00

The 3SK1211-2BB00 is a safety relay output expansion module with four safety-related normally open (NO) relay contacts and one normally closed (NC) signaling contact, designed for 24 V AC control voltage. It features spring-type push-in terminals, a width of 22.5 mm, height of 100 mm, and depth of 121.6 mm, with any mounting position. The device supports a maximum thermal current of 5 A per contact, operates within -25 °C to +60 °C, and meets IP20 protection. It is rated for SIL 3 per IEC 62061 and IEC 61508, PL e per ISO 13849-1, and category 4, with surge voltage resistance of 4,000 V and overvoltage category 3. It complies with UL and TÜV certifications and is suitable for Class B EMC environments.