320 A MCCB, TM220 Release — Line Protection for High-Fault Panels
The Siemens SENTRON 3VA1332-5GE42-0AA0 is a 4-pole molded case circuit breaker rated 320 A continuous at 40 °C, with a TM220 thermal-magnetic release designed for line protection. Short-circuit breaking capacity reaches 187 kA at 240 V and 121 kA at 415 V, giving headroom for high-fault installations where selectivity coordination is critical. Thermal derating is flat up to 50 °C (320 A), then drops to 313 A at 55 °C, 306 A at 60 °C, 299 A at 65 °C, and 292 A at 70 °C — plan the enclosure ambient accordingly.
Integration Notes
Dimensions: 248 mm high, 184 mm wide, 110 mm deep — fits standard panel cutouts for 4-pole MCCBs in the 320 A class. Front-side IP40 protection; no undervoltage release, no ground-fault monitoring, no communication function on this variant — pure line protection. Power loss at rated current is 80.1 W maximum — factor into enclosure thermal calculations.