The Siemens 3VA1332-5EF32-0BA0 is a 3-pole SENTRON molded case circuit breaker rated for 320 A continuous at 40 °C, with a TM240 thermal-magnetic overcurrent release. That 320 A holds flat through 50 °C — no derating needed until you cross 55 °C, where it steps down to 313 A, then 306 A at 60 °C, 299 A at 65 °C, and 292 A at 70 °C. For a panel builder, that means the breaker can sit in a warm enclosure without losing headroom until the ambient climbs past 50 °C. Breaking capacity is the real story here: 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 11.9 kA at 690 V. That 187 kA at 240 V puts it in the high-interrupting class for North American 240 V delta services; the 121 kA at 415 V covers European 400 V grids with plenty of margin for most industrial transformer ratings.
The undervoltage release (UVR) is built in, so if you need a shunt trip for emergency-stop or undervoltage protection, it's already wired.