Siemens SENTRON 3VA1332-6EF42-0AA0 — 320 A MCCB with TM240 Release
The Siemens 3VA1332-6EF42-0AA0 is a 4-pole SENTRON molded case circuit breaker rated for 320 A uninterrupted current (Iu) at 40 °C ambient, with a TM240 thermal-magnetic overcurrent release. It carries a 220 kA breaking capacity at 240 V AC, scaling down to 154 kA at 415/440 V, 121 kA at 500 V, and 17 kA at 690 V — figures that define its fault-interruption capability for high-available-fault-current distribution panels. This suits applications where the load profile is stable and the coordination study is done at design time — typical for feeder protection in industrial switchboards or as a main disconnect in a panel.
Sourcing & Lifecycle — Current Production, No End-of-Life Signal
Physical dimensions are 248 mm high, 184 mm wide, and 110 mm deep — a standard 4-pole MCCB footprint for the 3VA platform. Panel cutout and mounting hole pattern match other 3VA frame-size breakers, so a swap within the family does not require re-drilling the backplate.
Above that, derating begins: 313 A at 55 °C, 306 A at 60 °C, 299 A at 65 °C, and 292 A at 70 °C. Maximum power loss is 80.1 W. That is the heat the breaker dissipates at full rated current — relevant for enclosure thermal calculations, especially in a sealed, non-ventilated panel.
Integration Notes — Panel Fit and Accessories
The 3VA1332-6EF42-0AA0 accepts the full SENTRON 3VA accessory range: rotary handles, shunt trips, undervoltage releases, auxiliary contacts, and a motor drive. The front IP40 rating means the breaker is not washdown-rated; it belongs in a locked, indoor enclosure.