Siemens SIRIUS 3SK1211-1BB40: 24V DC Safety Relay Output Expansion
Siemens SIRIUS 3SK1211-1BB40 Safety Relay, 24V DC
The Siemens 3SK1211-1BB40 is a safety relay basic unit from the SIRIUS 3SK1 series, designed to monitor safety circuits like emergency stop buttons and protective door switches. It operates with a 24V DC supply and provides three normally open (NO) and one normally closed (NC) contact outputs. Certified to SIL 3 (IEC 62061) and PL e (EN ISO 13849-1), this compact relay ensures reliable protection for people and machinery.
This safety relay is essential for industrial machinery requiring Category 4 safety, such as emergency stop circuits, light curtain and safety sensor monitoring, and safety interlock systems. Its compact 22.5 mm width makes it ideal for control panels where space is limited, ensuring compliance with global safety standards.
Source your industrial automation needs from Stanlo Automation, a veteran-owned surplus parts distributor. We provide reliable access to high-quality components like the Siemens 3SK1211-1BB40, ensuring your operations run safely and efficiently.
| Supply Voltage | 24V DC |
| Output Configuration | 3 NO + 1 NC |
| Terminal Type | Screw terminal |
| Width | 22.5 mm |
| Safety Standards | SIL 3 / PL e / Cat. 4 |
| Reset Type | Automatic or manual |