The A3SSCA-6AAB-111 is a 3-position maintained cam selector switch with one normally-open and one normally-closed contact set. It's the kind of part you'd reach for when a panel needs a positive-action mode selector — maintained means it stays in whatever position you turn it to, no spring return. The cam mechanism gives clean, tactile make-break on the contacts.
The description reads "SEL 3POS MAINTN CAM C 1NO-1NC / SEL 3POS MAINTN CAM C 1NO-1NC" — a selector switch, three positions, maintained action, cam-operated, with one normally-open and one normally-closed contact. The repeated string is a data artifact; the functional takeaway is a single-pole double-throw switching element behind a rotary knob.