This 1PC Self locking 16MM Latching Push Button Switch With Yellow LED lighting 4Pin R16503 is a compact control device designed for reliable maintained operation and clear status indication. The builtin yellow LED provides immediate visual feedback, helping operators confirm the switch status at a glance. The 16 mm panel footprint allows integration into tight control panels, housings, or equipment front panels. The fourpin configuration supports both the switch contacts and the LED in a single module. Key benefits Maintained on/off control: push once to engage, push again to release; no need to hold the button. Clear status indicator: yellow LED lights to show active state. Spaceefficient design: 16 mm mounting diameter for compact panels. Simple wiring: 4pin configuration simplifies integration with standard electrical circuits and LED indicator. Key attributes Type: Selflocking (latching) push button switch. Panel size: 16 mm diameter. LED: Yellow illumination. Terminals: 4 pins. Model: R16503. Quantity: 1 piece. Mounting: Front panel, suitable for 16 mm cutouts. Application domains: Control panels, automation, equipment enclosures. Applications Start/stop control for a small motor or device in a machine panel. Power/reset control on a DIY electronics enclosure with LED status indication. Equipment indicator control on a cabinet or instrument panel. Installation notes Prepare a 16 mm panel cutout and mount the switch on the front panel. Wire the four pins to your circuit to control the load and LED indicator per your system requirements. For precise pin mapping and electrical specifications, refer to the product datasheet.