The ABB A3XLLLM is an A3 CAP ILLUMINATE — an illuminated pushbutton cap from the A3 series, used on ABB modular control stations and pilot devices. It provides visual status indication on a panel or enclosure, typically wired through a contact block and lamp holder.
As an illuminated cap, it fits the A3 pushbutton range commonly found in ABB control panels, operator stations, and industrial enclosures. The cap itself carries no electrical rating — the contact block and lamp determine the circuit parameters.