The interrupting capacity is the headline: 187 kA at 240 V AC, dropping to 121 kA at 415 V AC, 76 kA at 440 V AC, and 17 kA at 500 V AC — so it handles high-fault utility feeds or transformer secondaries where the available short-circuit current is serious.
Current rating vs. ambient — the real continuous capacity
At 60 °C it derates to 15 A, and stays at 15 A through 70 °C. That's a tight thermal curve — the breaker doesn't shed much capacity until you're well above typical panel ambient.
Footprint is 101.6 mm wide by 130 mm tall by 70 mm deep — a 4-pole MCCB that fits standard Siemens mounting patterns. The 4-pole config handles three-phase-plus-neutral or three-phase with a switched neutral.