3SK1121-1AB40

The Siemens Safety Relay, with the part number 3SK1121-1AB40, is a sophisticated and reliable component designed for seamless integration into various industrial safety systems. This advanced relay is part of the SIRIUS product range, renowned for its high-quality automation solutions.

Crafted to ensure the utmost safety, the 3SK1121-1AB40 operates with a 24 V DC control supply voltage and features a robust screw terminal connection for secure and stable wiring. The relay is equipped with three normally open (NO) contacts for enabling circuits, plus one normally closed (NC) contact for signalling purposes, providing flexibility and adaptability to a wide array of safety applications.

With an insulation voltage rated at 300 V and a protection class of IP20, this safety relay is designed to be finger-safe, preventing accidental electrical shocks. It is capable of withstanding a wide range of ambient temperatures from -25 to +60 °C during operation, ensuring reliability in diverse working environments.

The 3SK1121-1AB40 is specifically engineered for Class A environments, adhering to stringent EMC requirements to minimise radio-frequency interference in residential areas. It boasts an impressive mechanical service life with typical switching cycles up to 10 million, highlighting its durability and longevity.

This safety relay is also parameterisable, offering features such as sensor floating/non-floating, monitored start/autostart, and cross-circuit detection. It supports both single-channel and two-channel sensor connections, enhancing its versatility in monitoring safety switches, floating sensors, non-floating sensors, and magnetically operated switch monitoring.

The 3SK1121-1AB40 is a testament to Siemens' commitment to functional safety, with certifications that include Safety Integrity Level (SIL) 3 according to IEC 61508, Performance Level (PL) e according to EN ISO 13849-1, and Category 4 according to EN ISO 13849-1. These credentials ensure that the relay meets the highest standards of safety and reliability for machinery and safety-related circuits.

In summary, the Siemens 3SK1121-1AB40 Safety Relay is an essential component for any industrial safety system, offering advanced features, robust construction, and compliance with international safety standards. It is an ideal choice for those seeking a dependable solution to manage and enhance the safety of their automated processes.

• Monitoring and controlling safety functions in industrial automation systems
• Integration into safety circuits for emergency stop applications
• Overseeing light curtain safety devices in manufacturing environments
• Managing safety interlock switches on machinery access doors
• Controlling safety mats used in hazardous areas to detect presence
• Implementing safety measures in automated assembly lines
• Overseeing two-hand control stations in press and forming operations
• Providing safety functions in robotic work cells
• Ensuring safe operation of packaging and sorting machinery
• Monitoring speed and motion for safe operation of centrifuges and mixers