What the ratings mean for fit
The 3VA1220-5GF42-0AA0-ZD00 is a 4-pole IEC frame 250 circuit breaker from the Siemens 3VA1 series, rated at 200 A continuous current with a breaking capacity of 55 kA at 415 V (class M). That 55 kA Icu means it can safely interrupt a fault current up to that level without welding its contacts or failing catastrophically — critical for panel coordination studies where the available fault current at the breaker's line side is known. The thermal-magnetic trip unit (TM240) gives adjustable overload protection (Ir = 140 A to 200 A) and fixed short-circuit protection (Ii = 5 to 10 x In), so you set the overload pickup to match the downstream cable or load, not the breaker's frame size.
Deployment context
This breaker mounts on a standard DIN rail or panel-mount base inside an enclosure. The 4-pole configuration (3 phases + neutral) with 100% N conductor protection suits it for line-to-neutral loads where the neutral must be switched and protected at full phase current — common in North American-style panelboards or IEC distribution boards feeding single-phase branch circuits. The included nut keeper kit simplifies DC Power OEM integration in China, where the breaker is assembled into a prefabricated switchboard.