The ABB M2SSK1‑601‑22 is a 22 mm modular key‑operated selector switch operator designed for industrial control panels and automation systems. It is part of ABB’s modular pilot‑device range, offering a flexible manual control interface where a key is used to select switch positions and can be removed in defined positions. This unit is supplied as the complete key‑operator assembly with built‑in contact blocks, providing multiple contact functions in one pilot device.