That's the spec that governs selectivity coordination in a distribution panel.
Rated at In=16 A with adjustable overload protection Ir spanning 11 A to 16 A, and fixed short-circuit protection Ii set at 20 x In (320 A). The nut keeper kit is a panel-builder detail — keeps the mounting hardware captive during assembly, which matters on a high-vibration OEM build destined for DC Power applications in China.
For a critical-spare holding or a BOM line that needs a known part number, this one is still in the active catalog.
