What this 4-pole 25 A breaker is and where it fits
The Schneider Electric C11H6TM025B is a ComPacT NSXm moulded-case circuit breaker (MCCB) from the ComPacT range, built for distribution panels and sub-distribution boards. It's a 4-pole (4P) unit rated 25 A at 40 °C, with a thermal-magnetic TM-D trip unit — so the thermal element handles overloads and the magnetic element handles short-circuits, no external trip module needed. The 70 kA breaking capacity at 415 V AC (performance level H) means it can safely interrupt fault currents up to that level without upstream fuses or a bigger breaker — that's the kind of headroom you want when you're coordinating a panel and don't want a fault to cascade.
Ratings that decide the fit
The 25 A rating is at 40 °C ambient — if your panel runs hotter, you'll need to derate, but that's standard for any thermal-magnetic breaker. The 70 kA at 415 V AC is the interrupting rating (Icu) under IEC 60947-2, category A (no intentional short-time delay). That's a high-interrupting version (the 'H' in NSXm 63H), so it's suited for high-fault-current locations like near a transformer or a large service entrance. Pollution degree 3 (IEC 60664-1) means it's rated for conductive pollution or dry non-conductive pollution that becomes conductive — typical for industrial panels that aren't sealed clean rooms. Overvoltage category III means it's designed for fixed installations downstream of the main distribution board.