The FUJI NEMA1-110F1-2 is a NEMA1 kit rated for 300 A continuous across 3 poles, with a DC interrupt rating of 65 kA. This is the current-production lifecycle stage, so it remains a standard catalog item for new panel builds and BOM lines.
The 300 A rating governs the continuous current path through the kit — sized for feeder or large motor branch circuits where the full-load current stays under that threshold. Three poles means it switches all three phases in a three-wire circuit. The 6-inch length fits standard NEMA enclosure layouts; verify mounting hole spacing against your panel's backplate before committing the cutout.
The 300 A and 65 kA DC ratings are the two numbers that confirm fit for your application; provide those when requesting a quote to avoid mis-matching the internal components.