The Siemens SENTRON 3VA1332-7GF42-0AA0 is a 4-pole molded case circuit breaker rated for 320 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release. It carries a 440 kA breaking capacity at 240 V, which drops to 242 kA at 415 V and 440 V, and 154 kA at 500 V — still 17 kA at 690 V. That SCCR headroom means it can be placed upstream of distribution panels without worrying about cascading faults, even on high-fault utility feeds.
Thermal derating and real-world loading
Above that, it derates linearly: 313 A at 55 °C, 306 A at 60 °C, 299 A at 65 °C, and 292 A at 70 °C. Power loss at full load hits 80.1 W, which adds to the enclosure heat budget.
The breaker measures 248 mm high, 184 mm wide, and 110 mm deep. The 184 mm width for a 4-pole frame is standard for this class; it occupies roughly 7.24 inches of DIN-rail or mounting-plate width. The TM240 release is non-interchangeable in the field, so verify the trip curve against your load before mounting. A motor drive option is available as a factory or field accessory, which allows remote open/close without opening the door.