The A3PLE1-6L5R-10 is an illuminated pushbutton — 2-position momentary, 120 VAC integral transformer, red lens, one normally-open contact (1NO). It's the kind of panel-mount operator you'd find on a control station for conveyors, pumps, or machine start/stop circuits where a lit indication is part of the operator feedback loop.
What the specs tell you about fit
Two-position momentary means the operator returns to its rest state when released — no maintained latching. The 120 V transformer inside powers the red illumination directly from the line voltage, so no separate LED supply or dropping resistor is needed. One NO contact is the minimum for a simple start input; if your circuit needs a second contact or a NC break, this unit won't cover it without an add-on contact block. Panel-mount, not DIN-rail. The operator passes through a panel cutout and is secured with a retaining ring from behind. The transformer body and terminal block sit behind the panel — verify available depth in your enclosure before committing the cutout.