The ABB 2TLA030054R0100 INCA 1 is a twist-release emergency stop push button, panel-mounted in a standard 22.5 mm cutout. It's the kind of part you spec into a safety circuit where a positive-break, maintained-action E-stop is required — think machine guarding zones, conveyor lines, or any cell where a LOTO procedure needs a hard stop that stays latched until manually reset.
The 22.5 mm cutout is the panel-mount standard for 16 mm or 22 mm push buttons — it's the same hole you'd drill for most industrial E-stops, so retrofitting into an existing panel or a new build is straightforward. The twist-release mechanism means the operator pulls or twists to reset; that's the typical maintained-action pattern for safety circuits where the stop must stay engaged until a deliberate reset clears the hazard zone.