The 'FF' suffix signals fixed front terminals, and the UL listing means it is accepted for North American panel builds. The 1200 A continuous rating positions it as a main or large-feeder breaker in industrial switchboards, motor control centers, and generator paralleling gear — not a branch device. The EKIP DIP LS/I trip unit provides adjustable long-time (L) and short-time (S) protection plus instantaneous (I) pickup, giving the commissioning engineer control over selectivity with downstream breakers. The 1200 A rating at the frame size means the breaker can carry that current continuously in a 40 °C ambient without derating, though higher ambient or enclosed mounting may require a reduction per the UL 489 derating curve.
Because the part is current, availability runs through ABB's normal supply chain. No broker or surplus channel is needed for this code.