What this MCCB is and what the ratings mean for fit
The C11H44V050B is a Schneider Electric ComPacT NSXm 4-pole molded-case circuit breaker with a MicroLogic 4.1 electronic trip unit rated at 50 A at 40 °C. The 70 kA breaking capacity at 415 V AC (performance level H) means it can safely interrupt fault currents up to that level without cascading upstream — critical for high-fault panels where a lower-rated breaker would need a current-limiting fuse ahead of it. The electronic trip unit gives you adjustable thermal memory (20 minutes before and after tripping) and integrated earth-leakage protection with selectable sensitivity from 30 mA to 5 A for class A and class AC leakage types. That earth-leakage being integrated means you skip an external RCCB module, saving a DIN module's worth of panel space.
Deployment context and panel integration
Mounts on a backplate (not DIN rail) — horizontal or vertical, flat on the back. The 9 mm pitch is 12 modules wide, so at 108 mm wide and 144 mm tall it fits a standard distribution board cutout. Front connections top and bottom accept compression lugs or busbars; connection pitch is 35 mm with spreaders, 27 mm without. IP40 front face means it's protected against tools and wires >1 mm — fine for enclosed panels but not washdown zones. Pollution degree 3 per IEC 60664-1 means it's rated for conductive pollution typical in industrial control rooms.