SIRIUS Safety Switching Device Basic Unit Advanced Series Relay Release Circuits 3 Normally Closed Contacts plus Relay Signal Circuit 1 Normally Open Contact Us = 24 V DC Spring Terminal Connection (Push-In) Safety Switching Device SIRIUS 3SK1 for stand-alone safety applications. The Advanced Basic Units 3SK112 offer universal applications thanks to multifunctionality and flexible expansion options. They create 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 devices. Drives up to 3 kW can be directly integrated into the 3SK system with the fail-safe motor starters SIRIUS 3SK11 using 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 instantaneous or delayed, each with various time ranges, and consistently with screw or spring terminal connections (Push-In). Extensive accessories such as sealing covers, insertion tabs for wall mounting, 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 safety switching devices 3SK replace the proven series 3TK28. Safety is a SIRIUS business.