The Telemecanique XCMD21F0L5 is a miniature snap-action limit switch from the Square D Sensors & Switches line. It sits in the category of Miniature & Snap Action Limit Switches, meaning it's built for compact panel or machine-mount positions where a precise mechanical actuation point is needed to signal a position change.
As a Telemecanique / Square D product, it carries the usual compliance documentation expected for industrial control components — RoHS and REACH declarations are standard for this brand's current-production catalog. Specific UL or IEC listing numbers are not on this record, but the brand's typical approvals apply.