The adjustable overload Ir from 250 A to 630 A lets you dial in the exact motor full-load current, so one breaker SKU covers a range of motor sizes on the line. The short-circuit protection settings — Isd from 3 to 15 times Ir, and a fixed instantaneous pickup Ii at 15 times In (630 A) — give you the band to coordinate with downstream starters and avoid nuisance trips on starting inrush. The nut keeper kit and three HQ auxiliary switches are factory-fitted, so you don't have to order them separately or open the breaker cover to install them.
Frame 1000 breakers are sized for main or large-feeder positions in industrial switchboards and motor control centers. The three auxiliary switches (HQ type) give you status feedback for the PLC or SCADA — one NO/NC pair per pole, typically wired for open/closed/tripped indication. The nut keeper kit keeps the terminal hardware captive during wiring, a small thing that saves time on a panel build.