SICK L21E-21MA1A Single Beam Photoelectric Safety Switch

The SICK L21E-21MA1A is a receiver in a single-beam photoelectric safety switch with axial optics and a 16 m scanning range. It carries part number 6034875 and is designed to pair with a corresponding sender to form a complete safety switch, suitable for integration into safety-rated control systems. Powered from 24 V DC (19.2–28.8 V) via a 4‑pin M12 straight connector, the unit features an IP67 enclosure and IEC 61140 protection class III for rugged environments. Safety performance meets Type 2 (IEC 61496‑1), Category 2 (EN ISO 13849‑1), and SIL 1 (IEC 61508) requirements, and can achieve PL c when used with a compatible safety controller such as Flexi Classic or Flexi Soft; it supports an external test rate up to 100/s and a maximum demand rate of 60 min⁻¹, with a PFH of 1.0×10⁻⁶ per hour and a mission time of 20 years when used with the appropriate test device. The device’s response time is 0.2 ms plus the test device response time, and status is indicated by integrated LEDs for immediate local visibility. Designed for axial operation, the L21E-21MA1A provides a robust, standards-aligned solution for industrial safety applications requiring a reliable single-beam receiver.