The NC1V-1111F-5AA is a "Series Trip" breaker that features a Medium Time Delay (Curve A) but adds an Inertia Delay ("F" suffix). The Inertia Delay is a mechanical feature that prevents the breaker from "nuisance tripping" due to the high-magnitude, extremely short-duration (less than 1 cycle) inrush currents typical of inductive loads.
