1PC KD221 17MM Square PushButton Switch — Illuminated Green 3V, Locking, 8 Pins Why choose this switch Integrated illumination and locking action combine status indication with secure on/off control. The KD221 saves space and wiring work by providing both a tactile switch and a green indicator LED in one compact unit. Clear visual feedback: the builtin green LED (3V) makes it easy to see switch state at a glance, improving usability and safety in lowlight or busy control panels. Flexible wiring: the 8pin layout separates LED and contact connections so you can wire the indicator independently from the switching circuit. Key features and attributes Model: KD221. Form factor: 17MM square footprint, compact for panels and enclosures. Actuation: pushbutton with lock (latching) action for stable on/off operation. Illumination: integrated green light rated for 3V operation. Terminals: 8 pins for separate LED and switch contact connections, enabling flexible wiring and easier integration. Quantity: 1PC. Functionality and performance Combines a mechanical pushbutton contact with an LED indicator so you get both switching and visual status in a single component. Locking (latching) action holds the switch state after actuation, reducing accidental toggles and providing predictable control. The 8pin arrangement allows independent control of the indicator and the contacts, useful when you need the indicator powered from a different source or when monitoring switch state with separate circuits. Compatibility and installation Compact 17MM square design fits small panels, instrument bezels, and compact enclosures where a visible, lockable pushbutton is required. 8pin terminals are suited to soldering or PCB/terminal connections depending on your panel or assembly method. LED requires a 3V supply for correct illumination; wire LED pins independently if a separate indicator supply is used. Typical applications Control panels and operator consoles where a visible lockedon state is required (e.g., power control or mode selection). DIY electronics and custom enclosures where compact, illuminated latching switches simplify wiring and improve usability. Arcade cabinets, musical equipment, or machines where an illuminated, lockable pushbutton provides clear user feedback and secure operation. What you get One KD221 illuminated 17MM square pushbutton switch with green 3V LED, locking action, and 8 pins ready for integration into your project or panel.