The Siemens 3VA1225-4GE42-0AA0-ZD00 is a 4-pole molded-case circuit breaker on the IEC frame 250 platform, rated In=250A with a TM220 thermal-magnetic trip unit. Overload protection is adjustable from Ir=175A to 250A via the TM220 dial, so you can fine-tune the trip point to the actual load without swapping the breaker body. Short-circuit protection is fixed at Ii=10 x In (2500A magnetic pickup), which is typical for line protection of cables and busbars rather than motor starting. The 100% N conductor protection means the neutral pole has its own overload and short-circuit sensing — not just a switched neutral. That matters for 4-wire systems where unbalanced neutral currents can reach fault levels. The nut keeper kit included suggests this variant is destined for a DC Power OEM assembly in China, but the breaker itself is a standard 3VA1 catalog part.
The 36kA Icu at 415V is the ultimate breaking capacity — the breaker can clear one fault at that level and still be functional afterward. The 4-pole format with 100% N protection means it occupies four full pole widths in the enclosure — factor that into your panel layout.