What this breaker is and what the ratings mean
The Siemens 3VA1110-6GE42-0AA0-ZD00 is a 4-pole IEC frame 160 circuit breaker with a 100 A thermal-magnetic trip unit (TM220, ATFM). The headline number here is the 70 kA breaking capacity at 415 V — that's the Icu (ultimate short-circuit breaking capacity), meaning it can safely interrupt a fault current up to 70,000 A once without damage to the breaker. For a 415 V distribution board, that puts it in breaking capacity class H, which is the high-interrupting tier for this frame size. The overload protection is adjustable from 70 A to 100 A via the Ir dial, and the instantaneous short-circuit pickup is fixed at 10 x In (1000 A). The N conductor is protected at 100% rating, so this is a fully rated 4-pole breaker, not a switched-neutral variant.
Where it fits in the panel
This is a DIN-rail-mount IEC breaker in the 3VA1 platform — Siemens' compact molded-case line for distribution and motor branch circuits. The 4-pole format with 100% N protection suits it for three-phase plus neutral applications where the neutral is not derated (e.g., IT or TN-S systems with non-linear loads). The nut keeper kit for DC Power OEM in China indicates this variant includes hardware for DC-side mounting, likely for solar combiner boxes or battery distribution panels where the breaker is installed on a busbar rather than a DIN rail.