Y35A21410FPLFG is a subminiature tactile switch from the KSR Long Life series designed for surface-mount technology (SMT) applications with a 200,000-cycle operating life. The switch features a normally open contact arrangement with gullwing terminations, rubber actuator, and IP 50 sealing for environmental protection. It is available in multiple actuation force options ranging from 1.85 N to 4.50 N, with travel distances from 0.25 mm to 0.5 mm, and supports both silver and gold contact materials. The device operates reliably across a wide temperature range (-40°C to 85°C for silver versions, -40°C to 125°C for gold versions) and is RoHS compliant. Common applications include automotive, medical equipment, and industrial electronics where reliable momentary switching is required.