Siemens 3RK3 Series Safety Controller, 8 Safety Inputs, 4 Safety Outputs, 24V

This safety controller is a modular central unit designed to monitor and control safety-related circuits in industrial environments. It provides parameterisable evaluation of multiple protective devices and supports AS‑Interface connectivity for distribution of safe outputs. The device is intended for DIN‑rail mounting in automation panels where compact, configurable safety logic is required.

• 8 safety inputs provide extensive sensor integration for complex layouts
• 4 safety outputs deliver two‑channel stopping and safe switching functions
• Up to SIL3/PL e capability supports high-demand safety architectures
• Consumes 1.685A at 24V ensuring predictable supply planning
• LED indicators enable Rapid Visual status checks during commissioning
• Expandable with up to 9 extension modules for system growth

• Suitable for monitoring opto‑electronic protective devices in production lines
• Ideal for EMERGENCY‑OFF circuit and protective door supervision
• Used for two‑hand control and enabling switch evaluation in machine cells
• Can be used for valve and position switch monitoring in process equipment
• Suitable for AS‑Interface networks distributing safe outputs to actuators

Spring‑type removable terminals accept solid and finely stranded conductors with ferrule/crimp end processing within the specified cross‑sections and facilitate replacement without rewiring the device.

It is specified to withstand vibration up to 0.75mm at 5 to 500 Hz and shock loading of 15 g for 11 ms, supporting operation in typical industrial settings.

The device provides a safety‑related contactless semiconductor output with a DC switching capacity up to 1.5A at 24V and defined Pulse and recovery timings for safe switching sequences.

Operational ambient temperature is rated from -20 °C to +60 °C with storage and transport tolerances to -40 °C and +85 °C, and altitude limits up to 2,000 m.

Mechanical operating cycles are typically around 10,000,000, supporting long‑term deployment in production applications.