That dual rating means it's accepted in both light-commercial panels (EN 60898) and industrial switchboards (IEC 60947-2) where fault currents may be higher. The 20 kA figure under IEC 60947-2 gives you headroom for coordination with upstream devices in an industrial MCC.
Installation and wiring
Tunnel terminals at both top and bottom accept copper conductors — no special lug kit needed. The 70 mm installation depth is standard for the 5SP family, so it sits flush in a 4-module-wide DIN-rail slot alongside other SENTRON breakers. Wire it with the supply on either side; the B-curve doesn't care about line/load orientation.