Siemens 3SK1211-1BB40 safety relay

This relay-based expansion unit is ideal for extending the number of outputs in safety applications. Each of the 4 NO outputs can independently control actuators such as contactors, indicator lamps, or safety valves. The NC signaling contact allows for status feedback or fault indication. Compact and easily DIN-rail mountable, the module integrates seamlessly with Siemens 3SK1 base units, enabling flexible expansion of complex safety control systems.

The 3SK1211-1BB40 is widely used in industrial automation settings such as machinery control, robotics, packaging lines, and material handling systems. It is especially suited for safety systems requiring multiple independent outputs and is compliant with high-level safety standards such as SIL 3 or PL e. This makes it a key component in building robust, scalable, and reliable safety architectures.

safety relay Output expansion 4RO with relay enabling circuits 4 NO contacts plus Relay signaling circuit 1 NC contact Us = 24 V DC screw terminal

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