The ABB XT5-S-400 is a circuit breaker control unit for the XT5 series, rated for 415-890V. It is a current-production item, so this is the part you spec into a new panel or order as a line-side spare without worrying about a last-time-buy window.
This control unit mounts into an ABB XT5 molded-case circuit breaker frame. The 415-890V rating covers standard 400/480/690 VAC industrial power systems — common in motor control centers, distribution panels, and switchgear where the breaker needs remote trip or shunt-trip control.
The XT5-S-400 carries a current lifecycle stage — no phase-out notice, no successor part number to track.