What it is, and what 14-20 A actually buys you
The 1SA-M45-0000-R1002: The 14-20 A figure is the range that drives fit decisions on a BOM line: a panel built around a 14-20 A contactor frame, or a starter accessory that has to land on a contactor of that class, is where this part belongs. Outside that range the part is the wrong spec, not a compromise.
Class context — what this category of part is for
Contactor & Starter Accessories & Parts cover the modular hardware that completes a contactor or motor-starter build — links, spacers, lug kits, and the small interface pieces that ride alongside the main contactor body inside a motor-control panel. Accessories in this class are specified by the host contactor frame, not by panel-builder preference, so a line-down or BOM-fill request is almost always a request to match a specific contactor family and current class.