MCCB with 320 A continuous rating and 187 kA interrupting capacity
The Siemens SENTRON 3VA1332-5EF32-0AJ0 is a 3-pole molded case circuit breaker rated for 320 A at 40 °C ambient, with a TM240 thermal-magnetic release. Breaking capacity drops with voltage: 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 11.9 kA at 690 V. For a 400 V three-phase panel, the 121 kA figure is the one to coordinate against — verify that the downstream fault current at the breaker's location stays under that value to maintain selectivity. Current rating holds flat at 320 A from 40 °C through 50 °C, then derates linearly to 292 A at 70 °C.