The ABB XT7LU380CFFF000XXX is a Tmax T7S series fixed three-pole molded-case circuit breaker rated 800 A at 480 V AC, fitted with an EKIP DIP LSI solid-state trip unit. The LSI designation means it provides long-time (L), short-time (S), and instantaneous (I) protection — the standard package for feeder and main breaker duty where you need selectivity downstream and instantaneous fault clearing. Front terminals and a lever operating mechanism keep panel wiring and manual switching straightforward.
800 A continuous rating at 480 V AC positions this breaker for large feeder circuits, main switchboard incomers, or high-current distribution in industrial and commercial panels. The EKIP DIP LSI trip unit lets you dial in long-time pickup and delay, short-time pickup and delay, and instantaneous pickup — essential for coordinating with downstream breakers in a selective coordination study. Fixed mounting (not drawout) means the breaker is bolted to the bus; plan for isolation upstream if you need to remove it for service.