The ABB XT4SU3100FGGB00XXX is a 3-pole molded case circuit breaker from the XT4S 250 frame, fitted with an Ekip LSI electronic trip unit rated at 100 A continuous. It carries UL and CSA approvals, so it slots directly into North American panelboards and switchgear without a separate fuse or coordination study for the branch circuit.
The 100 A continuous rating on the Ekip LSI trip unit sets the long-time pickup; the LSI designation means it provides adjustable long-time, short-time, and instantaneous protection — not just magnetic-only. That matters for feeder circuits where you need selectivity with downstream breakers: the short-time delay lets a fault ride through long enough for the closest breaker to clear first, keeping the rest of the panel live. The XT4S 250 frame itself is a compact molded case design that mounts in standard panelboard or switchgear cubicle cutouts. UL 489 listing covers it for branch-circuit protection in North America; CSA C22.2 No. 5 covers Canadian installations. No additional agency marks needed for most industrial and commercial jobs.