The Siemens 3VA1332-4EF32-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 320 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release adjustable from 1 600 A to 3 200 A. It breaks up to 121 kA at 240 V AC, 75.6 kA at 415 V AC, and 75.6 kA at 440 V AC, with a rated insulation voltage of 800 V.
The 121 kA at 240 V and 75.6 kA at 415 V mean this breaker can safely interrupt high-fault currents typical in large distribution panels without cascading upstream — it holds its SCCR at those levels. At 500 V the capacity drops to 52.5 kA, and at 690 V to 11.9 kA, so for 690 V applications verify the available fault current is below that threshold. The continuous current holds at 320 A from 40 °C through 50 °C ambient; above that it derates linearly to 292 A at 70 °C.
Panel fit and approvals
At 138 mm wide by 248 mm tall by 110 mm deep, this MCCB occupies a standard 3-pole MCCB cutout. The TM240 release is fixed-trip thermal and magnetic, not electronic, so coordination studies should use the published time-current curves for the TM240.