The Siemens 3SK1211-1BB40 safety relay from the SIRIUS 3SK1 range provides dependable monitoring for emergency stop, guard door, and two-hand control functions. Its compact footprint and clear terminal layout make it a practical choice for control panels where reliable machine safety and standards compliance are essential.

Engineered for industrial environments, the 3SK1211-1BB40 features force-guided relay outputs, dual-channel input monitoring, and feedback loop supervision to ensure fail-safe operation. Manual or automatic reset can be configured to suit the application, while clearly visible status LEDs support fast diagnostics during commissioning and service. The unit mounts on a 35 mm DIN rail and uses robust screw terminals for secure wiring, with galvanic isolation between control inputs and outputs for safe interfacing with contactors and actuators. When properly integrated, it supports conformity with EN ISO 13849 and IEC 62061, providing a reliable core for safety-related control chains.

Whether building new panels or retrofitting existing machines, this Siemens safety relay helps shorten project lead times and standardize safety functions, and it is supplied with a 1-year warranty to add confidence throughout its service life.

• Brand: Siemens
• Series: SIRIUS 3SK1
• Model: 3SK1211-1BB40
• Output type: Safety relay contacts (force-guided)
• Supply voltage: 24 V DC
• Connection type: Screw terminals
• Protection rating: IP20
• Mounting: DIN rail 35 mm