Schleicher SNE 4004K-A Industrial Rotary Encoder

The Schleicher SNE 4004K-A is an expansion safety relay for Wieland Schleicher safety systems, designed to extend a basic safety unit with additional enabling, signaling, and feedback paths for multi‑channel safety applications. It provides four enable circuits, two signal circuits, and one feedback circuit, enabling complex safety interlocks, emergency‑stop, and guarding configurations in compliance with EN 60204‑1 and EN ISO 13849‑1 (PL E, Category 4) as well as SIL CL3 per EN 62061. The module operates from a nominal 24 V AC/DC supply (50–60 Hz) and uses plug‑in threaded terminals for secure connections, with a compact width of 22.5 mm suitable for panel mounting. The SNE 4004K‑A variant is the AC/DC 24 V version and offers options for one‑ or two‑channel activation, making it adaptable to single‑ or dual‑channel safety architectures. Typical uses include expanding safety relays for emergency stops, safety interlocks, and guarded access in automated machinery and production lines, delivering four enable paths, two signal paths, and a dedicated feedback path to support reliable safety function monitoring.