What this MCCB does on a real line
Breaking capacity is the headline here: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and still 17 kA at 690 V.
Thermal derating — the number that actually governs your ampacity
At 55 °C it drops to 158 A, at 60 °C to 155 A, at 65 °C to 153 A, and at 70 °C to 150 A. That's a gentle slope — only 10 A lost over a 30 °C rise — so you don't need to oversize for a warm enclosure.
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a 3-inch wide footprint that fits standard Siemens SENTRON mounting patterns. A trip indicator is built in — visual flag on the front tells you it tripped on fault vs manual off. It's a straight line-protection MCCB with the TM220 release.