The A3PLE1-6L5W-11 is an Allen-Bradley illuminated push button configured as a 2-position momentary operator with a 120V transformer-powered white LED and one NO plus one NC contact block. The transformer isolates the lamp circuit from the control voltage, which keeps the signal clean when the button shares a panel with VFDs or switching supplies — no separate DC supply needed for the illumination.
The description breaks down as: PB ILLUM 2POS MOM 120V XFMR WHT 1NO1NC. Two-position momentary means the button returns when released — no maintained latching. The 120V XFMR (transformer) powers the white LED directly from the line voltage, so the lamp stays on whenever the circuit is energized. One NO and one NC contact give you both a seal-in and a status feedback path from a single operator.