Rated for 52 A light-overload use (UL) and 40 Hp at 460 V, it runs on a 3-phase 440-480 V supply at 50/60 Hz. This is a current-production unit.
The 52 A light-overload (UL) rating is the figure that governs motor sizing — it's the maximum continuous output current under the UL light-overload profile, not a peak or surge number. At 460 V that translates to 40 Hp, so a 40 Hp induction motor on a pump or fan load is a direct match. The NEMA Type 3R enclosure means it's rated for outdoor installation (rainproof, sleet-resistant) without an additional weather shield, which saves panel space and conduit sealing effort.