The A3PP42-6LLR-91 is a 44mm main push-pull switch with red LED illumination rated for 6-24V, wired 1NO+1NC. This form factor is common on control panel doors for emergency-stop or main disconnect applications, where the push-to-stop / pull-to-reset action gives a clear visual and mechanical status indication.
The 44mm panel cutout is a standard industrial switch footprint — it fits the common 44.5mm knockout on steel enclosures, with the red bezel and LED providing a 'stopped' status at a glance. The 6-24V supply range covers both 12V and 24V control circuits, common in PLC-driven panels. The 1NO+1NC contact block gives one normally-open and one normally-closed set, enough to signal a stopped state back to the controller while also breaking the safety chain.