The A3PP42-6L2G-11 is a 44mm maintained pushbutton with a green operator, rated 24V, carrying one normally-open and one normally-closed contact block. It's a panel-pilot style unit — the kind you'd find on a machine control station where the button stays in after pressing, not a momentary. The 44mm panel cutout is a common industrial standard, so it'll drop into existing pedestal or enclosure holes without adapter plates.
The 1NO/1NC contact arrangement gives you both a make and a break contact inside the same block — handy for driving a pilot light off the NO while the NC feeds a safety interlock or status back to the PLC. Green operator is standard for run or start functions on most machine schematics. 24V is the coil or lamp voltage, common across control panels. No special wiring beyond standard pushbutton practice: spring-cage or screw terminals depending on the contact block variant, but this listing doesn't specify the termination type, so verify that against your existing block if you're replacing one in a live panel.