SIRIUS safety relay basic unit Advanced series with time delay of 0.5-30 s, electronic release circuits 2 s unlatched, 2 s delayed, Us = 24 V DC, screw connection. The SIRIUS 3SK1 safety relay is designed for stand-alone safety applications. The Advanced 3SK112 basic units offer universal applications due to their multifunctionality and flexible expansion options. They form an innovative system landscape capable of implementing complex safety functions with a variety of sensors and outputs. With device connectors, the number of inputs and safe outputs can be reliably and easily expanded without wiring effort between the devices. Drives up to 3 kW can be directly integrated into the 3SK system using the fail-safe motor starters SIRIUS 3SK11 via device connectors. All components have worldwide approvals, making them well-suited for global use and export. The devices are available with relay or semiconductor outputs, either unlatched or delayed, each with various time ranges, and consistently with screw or spring-loaded connections (Push-In). Extensive accessories such as sealing covers, mounting brackets for wall installation, and coding pins facilitate handling. Input and output expansions as well as a separate power supply can be used via device connectors without additional wiring effort. The 3SK safety relays replace the proven 3TK28 series. Safety is a SIRIUS business.