Magnet switch Contact block, round M30 Contact elements 1 NC/1 NO with 3 m cable Magnetically operated switch SIRIUS 3SE66 for space-saving and manipulation-proof monitoring of a guard fence, cover or door. The contactless coded devices are small and compact and are therefore suitable for use where space is very limited. They meet the highest safety requirements specified by PL e or SIL 3. Their non-wearing switching operations ensure a long service life. They are available in various shapes and sizes. Different combinations of contact elements and cable lengths, versions with LEDs for fast diagnosis, and plug-in connectors for fast connection are available. Spacers and various couplings with connection cables of various lengths are available as accessories. Safety is a SIRIUS business.