That split rating is common on European-spec MCBs — the buyer needs to know which standard their local code references.
Two modular-width units (18 mm each, 36 mm total) on standard DIN rail. Mounts in any position. The IP20 rating applies with conductors connected — meaning the busbar stabs and terminal screws are live when the front cover is off, so the panel builder treats it as a finger-safe enclosure only after wiring is complete.
If your BOM calls for a 2-pole C6 MCB with 15 kA breaking capacity, this is a direct fit — no cross-reference needed.