The SSM1A455F7: This is a solid-state overload relay — no bimetallic strip to drift, no mechanical contacts to weld. It monitors motor current and trips on overload using a semiconductor sensing circuit, which means it's more repeatable and faster than a thermal relay, especially on frequent-start or cyclic loads.
Lifecycle status is current — Schneider is still producing this part, so you can spec it into a BOM without worrying about an imminent last-time-buy.