Sick RE21-SA84 Safety Switch

Applications

• Safety door and guard monitoring in industrial machinery.

• Position detection for sliding, hinged, and removable machine covers.

• Packaging, food, and material-handling equipment requiring non-contact safety sensing.

• Robotics and automation systems where safe access detection is crucial.

• Conveyor safety interlocks and machine access points.

• Environments with vibration or frequent cleaning, thanks to IP67 housing.

Technical Precautions

• Ensure the actuator and sensor are correctly aligned to maintain the 6 mm assured switch-on distance.

• Install according to EN ISO 14119 guidelines for Type 4 safety systems.

• Avoid using in systems requiring internal fault detection, as the sensor depends on the external safety logic unit.

• Maintain bend radius >12× (fixed) and >15× (moving) for the cable to prevent damage.

• Do not exceed the 30 V DC switching voltage and 400 mA switching current.

• Protect the sensor from excessive mechanical stress during mounting.

• Keep away from strong magnetic fields that may interfere with operation.

• Follow proper sealing to maintain IP67 rating in wet or dusty environments.

While our engineers carefully upload product details based on official datasheets, occasional errors may still occur. We encourage users to verify specifications as needed for complete accuracy.

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