Siemens 3VA1050-2ED32-0AA0-ZD00 — a 3VA1 IEC frame 100, 3-pole circuit breaker. Breaking capacity class B gives you Icu = 16 kA at 415 V, enough for most industrial distribution panels fed from a typical 400 V transformer. Fixed thermal-magnetic trip (TM210, FTFM): overload Ir = 50 A fixed, short-circuit Ii = 10 × In (500 A). Line protection, not motor protection — no adjustable thermal curve, no ground-fault module. The nut keeper kit on this variant is for a DC Power OEM build in China; it's a captive-hardware add-on, not a functional difference in the breaker's electrical ratings.
Mounts on DIN rail in a standard 3-pole width. The nut keeper kit is pre-fitted for the DC Power OEM variant; if you're swapping this into an existing panel, check that the busbar connection pattern matches — the captive hardware is meant for a specific OEM busbar interface, not a generic lug.