ABB M3SS2-11G Industrial Safety Relay Module System

ABB M3SS2-11G is a 22 mm modular, green-illuminated selector switch (pilot device) intended for panel mounting in industrial control environments. Catalog numbers 1SFA611211R1102 (ABB) and Metel M3SS2-11G accompany the device, which measures 30 × 48 × 50 mm (H × W × D) with a 22 mm mounting cutout. It features a green illuminated actuator and a 3-position operation (A–B–C) with momentary action and spring return from positions A and C to the central B position. The housing is plastic, aligning with ABB’s modular M3S family of signaling devices, and ABB notes a high IP-rated protection suitable for demanding industrial environments. This variant provides clear visual feedback of the selected position on control panels and machine interfaces, helping operators quickly verify state at a glance.