The Siemens 3VA1220-6EE42-0AA0-ZD00 is a 4-pole IEC frame 250 molded case circuit breaker (MCCB) from the 3VA1 series, rated 200 A continuous with a TM220 thermal-magnetic trip unit. Overload protection (Ir) is adjustable from 140 A to 200 A via the ATFM dial; short-circuit protection (Ii) is fixed at 10 x In (2000 A). The N conductor is unprotected — the fourth pole is a switched neutral, not a protected pole.
The nut keeper kit for DC Power OEM in China indicates it ships with hardware for captive nut retention — a detail that saves time during panel assembly if you are building to a Chinese OEM spec or exporting gear.