The R16503 is a 1piece 16MM momentary push button switch with white LED illumination and a 4pin terminal. It provides momentary action, activating while pressed and returning to its default state when released. The separate LED circuit allows independent lighting, delivering clear visual feedback in lowlight conditions. This compact switch is designed for use in control panels and electronic projects where both user input and status indication are required. Key attributes Model: R16503 Quantity: 1 piece Diameter: 16 mm Action: Momentary LED color: White Terminals: 4pin configuration Illumination: White LED lighting Benefits and features Clear visual feedback: White LED lighting helps locate and identify the control in dim environments. Independent wiring: The 4pin configuration supports separate connections for the switch and the LED, enabling flexible wiring. Compact and versatile: The 16 mm diameter provides a compact footprint suitable for many panels and enclosures. Reliable momentary action: Activates when pressed and returns to the resting state when released, suitable for start/stop, reset, or input signaling. Applications Control panels for industrial equipment or automation systems, where a momentary input with indicator is needed. Hobby electronics and microcontroller projects (e.g., Arduino, Raspberry Pi) requiring a visible, momentary push button with status lighting. Arcade cabinets, gaming interfaces, or prototype hardware that benefits from a compact, illuminated momentary switch. Wiring and compatibility notes Features a 4pin terminal suitable for separate LED and switch connections. Designed to be used in applications requiring a white LED indicator and a momentary push button action. For electrical ratings and wiring specifics, refer to the product's datasheet or manufacturer guidelines.