The ABB A3XLLLR is an A3 CAP ILLUMINATE CAP — an illuminated pushbutton cap from the A3 series, used as a replacement lens or actuator cap on ABB illuminated pushbutton stations and selector switches in control panels and operator interfaces.
The A3XLLLR is the illuminated cap portion of an ABB A3-series pushbutton. It snaps onto the switch actuator and houses the indicator lens. In a typical panel, the cap is the visible interface the operator presses or sees illuminated.