The S8VKT24024: Handles single-phase dropout too: the AC input range is 380-480 VAC, but it also runs on 450-600 VDC if you've got a battery bank or DC link handy. Startup takes 600 ms max, and the hold-up time after a power bump is at least 24 ms – enough to keep a controller alive through a brief sag.
Mounts on a DIN rail. Accepts wire from 22 AWG to 10 AWG. IP20 rated and includes a green LED status indicator. Efficiency runs 89% typical, which keeps the heat sink manageable. If you're stacking supplies side by side, leave a few millimeters of air gap – Omron recommends 10 mm top and bottom for convection cooling. You can also parallel two units for higher current or run them in series for a non-isolated 48V rail.