The A3PP42-6L4G-91 is a 44mm main push-pull pushbutton with a 120V green actuator, wired as one normally-open and one normally-closed contact. This is the type of panel-mounted control you'd see on a machine start/stop station or an emergency-off pull release — the push-to-make, pull-to-break action gives a positive mechanical latch that stays until you deliberately reset it.
The 44mm panel cutout is larger than the common 22mm or 30mm pushbutton — this is a heavy-duty main control device, sized for gloved-hand operation on industrial machinery. The 120V green actuator means it's wired into a 120VAC control circuit, not a 24VDC safety loop; verify your control voltage matches before committing. The 1NO+1NC contact block gives one set of normally-open and one normally-closed contacts, which covers a basic start/stop or enable/disable pair — enough for a simple two-wire control scheme but not for dual-channel safety circuits that need redundant NC contacts.