Siemens 3VA1132-6MH36-0AA0 SENTRON MCCB, 32 A, 220 kA at 240

The interrupting ratings tell the story: 220 kA at 240 V, 154 kA at 415 V, and 121 kA at 440 V mean this breaker can clear a fault at those levels without welding contacts or venting gas into the panel. Below 500 V the curve drops to 7.5 kA, and it holds that same 7.5 kA at 690 V — so on a 480 V or 600 V line you're still well within the rating, but the high-fault capability is really in the 240–440 V band where most industrial distribution sits. The TM120M release has an adjustable magnetic trip (li) from 224 A to 510 A — that's 7× to 16× the 32 A continuous rating. For a motor starter circuit you'd set the magnetic pickup just above the inrush so it doesn't nuisance-trip on start, but still catches a locked-rotor fault. The thermal element handles the overload curve; it's fixed at 32 A and derates with ambient temperature — the spec table shows it holds 32 A up to 50 °C, then drops to 31 A at 55–60 °C, and 30 A at 65–70 °C. If your panel runs hot, that 2 A derate matters for the continuous load. Mounting footprint: 76.2 mm wide (3 in), 130 mm tall, 70 mm deep — standard MCCB form factor for a 3-pole frame.