The ABB XT4LU3125BFF000XXX is a 4-pole molded case circuit breaker (MCCB) from the XT4L series, rated 20 A continuous current with 4 W power dissipation at rated load.
The 20 A rating governs conductor sizing and upstream protective device coordination. The 4-pole configuration suits three-phase four-wire systems. The 4 W dissipation is the heat load at rated current.
Deployment context and mounting
Wall-mount construction means the breaker is designed for direct surface mounting on a panel backplate or enclosure wall, not DIN-rail snap-on. This is typical for larger frame MCCBs where bolted connections provide the mechanical stability needed for high-fault-duty terminations. The enclosure cutout and mounting-hole pattern should be verified against the ABB XT4L drilling template before panel fabrication.
No last-time-buy or phase-out notice is on record. For BOM-freeze or project-bid purposes, the part is specifiable without an immediate obsolescence risk.