Breaking capacity is the headline here: 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and it still holds 11.9 kA all the way up to 690 V. That's a high-interrupting rating for a 16 A frame — this isn't a general-purpose feeder breaker; it's sized for high-fault locations like a main or subfeed in an industrial switchboard where available fault current is serious.
That's a clean thermal curve; you don't lose headroom until the panel is genuinely hot. Dimensions are 130 mm tall, 101.6 mm wide, 70 mm deep — a 4-pole MCCB in a compact footprint that fits standard Siemens SENTRON mounting bases.