The Siemens SENTRON 3VA1332-4EF32-0KG0 is a 3-pole molded case circuit breaker rated 320 A continuous at 40 °C through 50 °C, with a TM240 thermal-magnetic trip unit. Above 50 °C, the thermal derating curve applies: 313 A at 55 °C, 306 A at 60 °C, 299 A at 65 °C, and 292 A at 70 °C.
Breaking capacity by voltage — selectivity and SCCR headroom
The interrupting ratings span the common industrial voltages: 121 kA at 240 V, 75.6 kA at both 415 V and 440 V, 52.5 kA at 500 V, and 11.9 kA at 690 V. The 690 V figure (11.9 kA) is lower — worth checking if your system runs at that voltage and fault current approaches that threshold.
That 138 mm width across three poles is standard for this frame class — it fits the usual SENTRON mounting footprint without surprises.