Another of the many cheap industrial components available from China via eBay. These are commonly available because they are so widely used in Chinese factories.
This one is an illuminated panel mounting momentary action push button with separate normally closed and normally open contacts. It is designed to fit through an industry standard 22mm hole.
Although intended for 220V use it will operate at 110V too at slightly reduced intensity.
I didn't spot the 1 Megohm discharge resistor hiding underneath the capacitor to avoid tingles from the lamp contacts when the lamp is de energized.
To adapt the lamp to 12V AC or DC you could replace the capacitor with a wire link. For 24V AC or DC you could replace the capacitor with another 1K resistor.
These cheap clone industrial components are fine for DIY or prototyping, but in an actual factory environment It's probably better to go for recognised brands for liability and reliability reasons.
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