Y71243221FP is an illuminated tactile switch from the K5V series, designed for applications requiring both backlighting and momentary switching action. It features a gold plated dome contact with SPST/SPDT configuration and normally open plus normally closed contact arrangement. The switch offers an operating force of 4.0 N (400 grams) with a tolerance of ±25%, a total travel of 2.4 mm (1.2 mm actuation travel), and is rated for 25,000 operations. Available in THT, SMT, and panel mount versions, this RoHS compliant switch provides excellent ergonomics and high bright LEDs including single color and bi-color (YG/RG) options. Common applications include control panels and user interfaces where visual feedback and tactile response are required.